Abstract
Pulse compression based on stimulated Brillouin scattering (SBS) is a nonlinear optical approach that efficiently converts high-energy nanosecond pulses into the picosecond. Since the first observation of SBS pulse compression, different compression structures for different input and output parameters were developed to optimize the characteristics of pulse compression in the past decades. Here, a comprehensive review of the development status of SBS pulse compression schemes is provided, meanwhile, methods and trends to the optimization of SBS pulse compression are proposed.
Introduction
High-energy picosecond pulse lasers have attracted significant attention for their extensive and important applications, such as satellite laser ranging [1–3], laser processing [4–6], and medical laser treatment [7, 8]. In the field of satellite laser ranging, ultra-high-precision remote ranging can be achieved using picosecond lasers. For example, measurement of the distance between the earth and the moon [9], the geosynchronous orbit satellite with ranging accuracy of sub-centimeter [10], and BeiDou navigation satellite system with single ranging accuracy of 8.5 mm [11]. For laser processing, due to the shorter pulse duration compared to that of the nanosecond, picosecond lasers can effectively inhibit the formation of heat-affected zones, realizing higher precision in processing materials. In addition, the higher peak power density can greatly improve the material removal rate and the quality of the burnt surface while the material is surface-textured [12–14]. Mode-locking is the most common approach to generate picosecond pulses, which demonstrates extremely low single pulse energy (∼nJ to μJ) [15–18]. Q-switching is another method to generate short pulses, but it is difficult to obtain pulses narrower than 300 ps due to the limitation of cavity length and switching speed [19–22]. Even though picosecond pulses can be achieved via mode-locking and Q-switching techniques, the lower power amplification efficiency induced by the short pulse duration limits their applications. Namely, the generation of picosecond pulses with high-energy directly from laser cavities and amplifiers is still a challenge.
Nonlinear optics technique provides another approach to control the temporal and spatial modes of pulses exiting a laser system. Among them, stimulated Brillouin scattering (SBS) [23], one of the strongest nonlinear light-matter interactions occurring in transparency media, has been widely studied for converting the temporal mode into a shorter one, or rather, pulse compression [24]. Today, many laser systems for high-energy picosecond pulses are realized by using pulse compression based on SBS. A key advantage of the SBS technique is generating time-reversal beam at the Stokes frequency, thus, some SBS compressors are also called SBS phase conjugate mirrors (SBS-PCMs). By appropriately using SBS-PCMs, except for realizing picosecond pulses, one can also compensate wavefront distortions caused by optical elements during laser transmission and amplification processes, leading to a higher beam quality output [25, 26]. For this reason, today, the combination of SBS-PCMs and master oscillator power amplifier (MOPA) is a common method to achieve high peak power, high beam quality, and narrow pulse width lasers [27]. Although showed that the distortion with vortex wavefront will lead to the input “donut-like” pump pluses into peta-like Stokes pluses [28], SBS is always the most effective phase conjugation method for conventional lasers with the fundamental (i.e., TEM00) spatial mode.
SBS-based beam amplification technology, or named stimulated Brillouin amplification (SBA), is another effective method to obtain high-energy pulses. In this “three-wave” mixing process, the energy in the pump wave is transferred to a pre-prepared and counter-propagating Stokes wave, and parametrically generating an acoustic wave to hold the energy conservation. Compared with nonlinear crystals for optical parametric amplification (OPA), SBS media, usually are liquids, can provide a much higher limitation on the power loading. Therefore, energy of up to tens of joules can be obtained through the "beam splitting-amplification-beam combination" method [29–31]. Additionally, optical limiters, a technique for transmitting a low-intensity beam, made by SBS technology have also been widely used in high-power lasers, which can effectively protect optical elements and improve the stability of the laser system [32, 33]. Especially, based on SBS pulse compression has been demonstrated to be an effective method to convert nanosecond long pulses into picosecond short pulses due to the advantages of low cost, simple operation, and high efficiency. High-power short-pulse with peak power of ∼GW and pulse width of hundreds of picoseconds can be obtained through this technology [34, 35].
Besides, driven by the recent advances in the field of structured light during the last two decades, generation and application of laser beams or pulses with high-order (scalar and vector) spatial modes have gained increasing attention [36, 37]. Although the study on shaping light’s spatial modes via nonlinear interactions can be traced back to the dawn of the field [38], the SBS involves structured light was theoretically considered until the last decade and only explored experimentally in recent years, yet demonstrating a series of impressive results [28, 39–44]. For years, detailed research works on SBS-based pulse compression technology had been hotly pursued by several groups. Although many overviews on the research progress of SBS media have been reviewed, there are few reports on summarizing the structures of SBS pulse compressors [45, 46]. In this paper, recent research progress using different SBS pulse compression structures for picosecond pulse generation were reviewed. Meanwhile, both the advantages and disadvantages of different structures were compared and analyzed. Finally, the optimized pulse compression structure that can be applied in the future was proposed, which provided a reference for the development of a high-energy laser.
Principle of Pulse Compression Technology Based On Stimulated Brillouin Scattering
SBS is a physical process of three-wave coupling formed by the interaction of strong light and matter. The physical process of SBS is depicted in Figure 1A. The backward propagating Stokes beam is generated by the interaction of the high-intensity pump and the medium under the periodically changing acoustic grating. Then the Stokes is continuously amplified with time by the scattering effect of the acoustic grating on the pump. The process shows the characteristics of high-efficient pulse compression by the energy transfer from the pump to Stokes directly with the peak power density greatly enhanced. However, it should be noted that the efficiency of the energy transfer process (pulse compression process) will be affected by many factors, for example, the interaction length of the pump and Stokes beams. Too short interaction length will lead to low pulse compression efficiency and low energy conversion efficiency. However, too long interaction length can also result in negative effects including tail modulation and pulse width broadening. Therefore, choosing an appropriate interaction length is critical to realize high-efficiency SBS pulse compression with high quality. The electrostriction effect produced by the polarization of the molecules in the medium causes the change of refractive index or density. Then, pump light is scattered by periodically changing density fluctuations which are also called moving gratings and its transmission direction is changed, enhancing the intensity of backward propagating Stokes light.
FIGURE 1
(A) The physical process of SBS, (B) Principle diagram of pulse compression based on SBS.
The diagram of the SBS-based pulse compression is shown in Figure 1B. The leading edge of the backward-propagating Stokes light meets the forward-propagating pumping light firstly. The energy of the pump light is transferred to the Stokes light through the phonon field vibrated in the three-wave coupling process. At this moment, the leading edge of Stokes light is magnified and the trailing edge remains unchanged. Because the energy of the pump light has almost been exhausted by the leading edge of Stokes light, and it has almost no amplification ability when it meets the trailing edge. This process is manifested as the steepening of the leading edge of the Stokes light waveform and the narrowing of the overall pulse width of the laser pulse, which is the so-called pulse compression technology. A large number of research groups have carried out exploration works for pulse compressors based on stimulated Raman scattering (SRS) and SBS [47–61]. Maier et al. and Chiao et al. successfully observed backward Raman scattering caused by forwarding Stokes radiation scattering and Brillouin scattering, which was based on noise [47, 61]. In 1972, Stolen et al. achieved the SRS-based pulse compression in glass optical waveguide for the first time [53].
Reaserch Progress of Stimulated Brillouin Scattering Pluse Compressors
Tapered Waveguide
In the early stage, most of the pulse compression based on SBS was fulfilled in tapered waveguides. In 1980, Hon et al. for the first time realized the SBS pulse compression in a tapered waveguide filled with methane at a pressure of 130 atm [60]. Figure 2 illustrates the basic structure of the tapered waveguide pulse compressor [62]. In such a tapered fiber, the Stokes light is first generated in the smaller core of the generator section and the main power reflection takes place in the amplifier. With this specific structure, the SBS gain is enhanced due to the smaller diameter of the optical fiber in the SBS generator. During the tapering process, both the length and angle of the taper can be controlled to obtain optimal results for a given system. For instance, a longer tapered region can effectively decrease the power coupling loss between the generator and the amplifier [63]. However, although this structure has a lower SBS threshold, it cannot be applied in SBS pulse compression experiments with high energy peak power due to the limitations of fiber material [127]. Therefore, more universal structures are required for pulse compression.
FIGURE 2
Schematic diagram of tapered waveguide. (A) Tapered waveguide pulse compressor, (B) Schematic diagram of tapered waveguide structure [62].
Focusing Single Cell
Compared with tapered waveguide, lens focusing structure has advantages of high stability and lower cost. In the 1980s, the focusing single-cell structure was first proposed by Damzen et al., and the basic structure was shown in Figure 3. They obtained the compressed pulse with a width of 4 ns in methane [64]. Since then, a large number of groups have used the structure to perform compression in different media [65–73] (as shown in Table 1). For instance, Kmetik et al. compressed the pulse width from 10 to 0.9 ns with an energy of 0.57 J in ultra-filtered FC-75 liquid medium and obtained up to 94% energy reflectivity [71]. Yoshida et al. proved for the first time that a 1,064 nm pump pulse and its second harmonic (532 nm), third harmonic (335 nm), and fourth harmonic (266 nm) could be compressed to hundreds of picoseconds based on a single-cell structure that demonstrated over 80% energy [72, 73]. The above two experimental results prove that due to the advantages of compact structure and easy adjustment, using the focusing single cell is easy to obtain high energy reflectivity. In 2016, Liu et al. conducted comparative experiments on pulse compression of pump light with different waveforms, and the results showed that the pulse width of the step pulse could be compressed to half of the phonon lifetime with a single-cell with energy efficiency exceeding 65%. The schematic diagram of the experimental device is shown in Figure 4 [74]. Bai et al. developed a picosecond laser with <450 ps pulse width and single pulse energy of 400 mJ by combining MOPA with SBS pulse compression [75]. In 2018, Liu et al. applied a single-cell structure based on an interferometric scheme to break through the pulse compression limit (the phonon lifetime of the medium). They obtained a compressed pulse output of 0.36τB with energy efficiency of 65% in FC-3283, and a compressed pulse output of 0.12τB with energy efficiency of 40% in Acetone, which was close to one-tenth of the phonon lifetime [76].
FIGURE 3
Schematic diagram of focusing single cell structure.
TABLE 1
| Author (Year) | Medium | Pump pulse width/ns | Compressed pulse width/ns | Output energy/mJ | Energy efficiency |
|---|---|---|---|---|---|
| Damzen et al. (1983) [62] | Methane | 27 | 4 | 10 | 70% |
| Gorbunov et al. (1983) [64] | Ar | 20 | 1 | 500 | 80% |
| Tomov et al. (1985) [65] | Freon−12 | 25 | 1.5 | 180 | 35% |
| Buzyalis et al. (1985) [67] | Carbon tetrachloride | 12 | 0.7 | 1 | \ |
| Davydov et al. (1986) [68] | Carbon tetrachloride | 30 | 1.2 | 40 | 90% |
| Kmetik et al. (1998) [70] | FC-75 | 10 | 0.9 | 570 | 94% |
| Yoshida et al. (2004, 2007) [71, 72] | Fused Silica | 8 | 1 | 1,000 | 40%, 95% |
Typical experimental results in single cell structure.
FIGURE 4
Schematic diagram of experimental setup: (A) special waveform generator, (B) single-pass SBS compressor [74].
The focusing single-cell structures have the advantages of simple structure and easy operation. However, with the increasing of injected energy, the low load capacity of this structure will lead to the phenomena of optical breakdown, hindering the generation of Stokes seed light in severe cases. Therefore, the single-cell structure is mostly used in small and low-energy commercial laser systems. Piskarskas et al. theoretically analyzed the space-time characteristics of the Stokes beam formed when the pump light intensity was unevenly distributed in spatial cross-sectional. They proposed that the two-cell generator-amplifier setup should be preferred to realize a compression ratio higher than 10 [77].
Focusing Two-Cell Structure
To overcome the shortcomings of the focusing single-cell structure, the two-cell structure was introduced to separate the compression part and the generating part of the original single cell into two independent cells. The design enables the control of the energy which is injected into the generator, thereby improving the load capacity and stability of the entire system. In addition, the interaction length between pump light and Stokes seed light is increased, which is beneficial to obtain a high compression ratio. Compact two-cell and independent two-cell are the two most used structures.
Compact Two-Cell
Figure 5 illustrates the schematic diagram of a compact two-cell structure. In general, an attenuator is placed in front of the focusing lens to reduce the energy entering the generator, or a beam expander system is placed in front of the amplifier to reduce the intensity of the pump pulse. This is to avoid irreversible damage to components caused by optical breakdown. Schiemann et al. conducted compression experiments in three liquid media: water, methanol, and carbon tetrachloride. The minimum pulse width of 270 ps (central part of the beam) was obtained with a reflectivity of 75% [78].
FIGURE 5
Schematic diagram of compact two-cell structure.
In recent years, great breakthroughs have been made in pulse compression ratio and energy efficiency [79–89] (as shown in Table 2). Yoshida et al. compressed the pulse width from 13 to 160 ps with a central wavelength of 1,064 nm in an FC-40 liquid medium. The beam brightness was increased by nearly 65 times, and the highest energy efficiency exceeded 80% without optical breakdown (the experimental setup is shown in Figure 6) [84]. Wang et al. proposed a new type of cyclic compact two-cell structure for realizing SBS-PCM with a high-energy and high-repetition rate. Energy reflectivity of 84.7% was obtained with an incident energy of 1.1 J at a repetition rate of 10 Hz [79]. Hasi et al. compressed the 10 ns to 116 ps in different perfluorocarbon liquid media, generating the single pulse energy over several hundred millijoules with energy reflectivity over 80% [80, 81, 85].
TABLE 2
| Author (Year) | Medium | Pump pulse width/ns | Compressed pulse width/ns | Output energy/mJ | Energy efficiency (%) |
|---|---|---|---|---|---|
| I.Daito et al. (2012) [79] | FC-40 | 8 | 0.2 | 300 | 80 |
| Hasi W et al. (2013) [80] | FC-770 | 8 | 0.116 | 260 | 80 |
| Zhu et al. (2014) [81] | FC-40 | 8 | 0.136 | 300 | 80 |
| Ogino et al. (2014) [82] | FC-40 | 4 | 0.4 | 34 | 75 |
Typical experiments of compact two-cell structure.
FIGURE 6
Schematic diagram of typical experiment design of compact two-cell [84].
In 2015, Wang et al. proposed an interferometric scheme to generate standing waves in the focal area to improve energy stability. The pulse was compressed from 8 ns to 393 ps with a single pulse energy of 40 mJ with high stability [87, 88]. In 2017, Bai et al. achieved picosecond ultraviolet (355 nm) output with compact two-cell structure. The pulse width was compressed from 6.3 ns to 168 ps with an output energy of 100 mJ and the energy efficiency of about 35% [89]. In 2019, Wang et al. obtained a short pulse of 820 ps at kHz repetition rate in HT270 liquid medium with energy efficiency of 52.2% for the first time [90].
Due to the advantages of higher load capacity and longer effective interaction length, the compact two-cell structure can obtain shorter pulse width and higher energy efficiency with different SBS active media. But the energy stability becomes worse with the increase of pump energy, which is similar to the focusing single cell structure. Controlling energy through the attenuator also has several defects, such as low energy efficiency and adjustment accuracy. In 2006, Mitra et al. proposed a new type of "one-cell, dual-purpose" compact two-cell structure [91]. Their results show that more than 90% energy efficiency can be obtained with the pulse width close to 1 ns at the injected energy reaching above 1-J level without inserting an attenuator. The minimum pulse duration of 600 ps could be obtained when the attenuation was 45%, while the energy efficiency was only 55%. Kmetik et al. designed the compact dual-cell compressor which was applied to the GEKKO-XII laser device, realizing high-energy pulse compression with a large-diameter laser system [92]. The pulse was compressed from 13 ns to 600 ps at the output energy up to 30 J approximately with the low energy efficiency. Therefore, the compact two-cell structure is unsuitable to be applied in the situation of high energy. At this time, an independent two-cell structure was proposed which could flexibly adjust the injected energy of two-cell, respectively.
Independent Two-Cell
The independent two-cell structure is actually a kind of light splitting structure, which divides the pump light into two parts: seeding pump light and amplifying pump light (as shown in Figure 7). The utilizing of optical elements such as waveplates and polarizers can flexibly control the meeting position, meeting time, and intensity ratio of the two beams. The structure effectively improves the load capacity of the entire system under high energy. In 1984, Fedosejevs et al. first proposed an independent two-cell structure and using KrF laser to compress long pulses from 24 ns to 440 ps with the energy efficiency of about 40% [93, 94].
FIGURE 7
Schematic diagram of basic independent two-cell structure.
Compared with other structures, the obvious advantage of the independent two-cell structure is adjusting the pulse intensity in the two cells arbitrarily, resulting in avoiding nonlinear effects such as an optical breakdown. In the follow-up research, more detailed research and optimization of the optical path structure were carried out to achieve more precise and stable control of the beam intensity [128].
Dane et al. added an adjustable delay light path for changing the relative delay time of the seeding pump light and the amplifying pump light in the independent two-cell structure for the first time. The scheme obtained output energy of 2.5 J, and proposed a new optimization direction for compression characteristics [95]. From 2014 to 2017, Xu et al. conducted a series of pulse compression experiments. Compressed pulse width from 12 ns to 580 ps at the center wavelength of 1,064 nm in FC-72 was performed. At the center wavelength of 532 nm in water, the pulse width was compressed from 9 ns to 170 ps which was close to the phonon life limit of the medium. At the same time, they explored the relationship between the meeting position of the two light and the magnification effect in the independent two cell structure. In the two experiments, the energy reached 1 J level with the peak power over 1 GW [97–99, 129, 130].
The independent two-cell structure can largely avoid the non-linear effects such as optical breakdown, self-focusing, and self-defocusing under high-energy conditions, which inclines it to obtain better compression output characteristics and beam quality. However, introduced additional optical elements directly cause considerable transmission energy losses. Consequently, it is unfavorable for obtaining high energy efficiency. At the same time, the complexity of the optical path and the adjustment difficulty cannot be ignored, especially in the application of large-scale laser systems.
Other Structures
Multi-Stage Compression Structure
The multi-stage compression method provides the possibility to compress the pulse width to below 100 ps [100–108]. From 2003 to 2006, Wang et al. compressed the pulse width from 8 ns to 153 ps with two-stage compression in FC-75 [102, 103]. Pivinskii et al. proposed a new three-stage pulse compression structure for the first time. It was composed of a two-stage SBS compression system and a terminal SRS compression system. The original pump pulse of 8 ns was compressed to the ultrashort pulse of 20 ps in carbon tetrachloride liquid with an output energy of 6 mJ. At the same time, it was proposed that pulses below 10 ps could be obtained with lower output energy [106]. Figure 8 illustrates the schematic diagram of the two-stage compression.
FIGURE 8
Schematic of the two-stage compression structure.
Generally, large-aperture laser systems rely heavily on beam quality. Although the multi-stage compression structure has made a great breakthrough with pulse width, the problems such as wavefront distortion and poor stability caused by the increasing of components have seriously affected the beam quality and energy efficiency. Therefore, improving the beam quality is the core issue for this structure to be applied in large-aperture high-power laser systems in the future.
Non-focusing Structure
For a long time, reports on the structure of SBS pulse compressor have basically focused on the lens focusing structure [72, 81, 98, 109]. To improve the stability under high-energy conditions, Neshev et al. proposed a new non-focusing single-cell structure for the first time and compressed the pulse width from 4 ns to 200 ps [108]. In 2015, our group obtained a short pulse of ∼360 ps with a single pulse energy of 3.02 J, and there was no thermal effect or other nonlinear effects during the compression process [109]. Figure 9 provides a schematic diagram of the experimental device and principle of the non-fousing method. The high reflectivity mirror was used to reflect the Stokes component of the sideband component of the super-Gaussian pump light to form the "feedback-initiated" Stokes seed light, and then compressing and amplifying. This method can suppress the generation of seed light originating from randomly distributed thermal noise. Thereby it reduces the probability of phase distortion and improves the stability of the system and the beam quality of the output pulse. Although this structure can be used for high-energy pulse compression characteristics research experiments, its injection energy will be limited by the noise-initiated SBS threshold in the medium cell. In addition to the mentioned challenges, the modulation procedure of the pump pulse cannot be removed because of the non-conjugation in this process. Table 3 lists the advantage and disadvantages of different structures.
FIGURE 9
The schematic diagram of "feedback-initiated" non-focus structure experimental device and principle: ①represents the "feedback-initiated" Stokes reflected pulse waveform; ② represents the coexist of "double peak" reflected pulse waveform of "noise-initiated" Stokes and "feedback-initiated" Stokes [109].
TABLE 3
| Name of structure | Advantage | Disadvantage |
|---|---|---|
| Tapered waveguide | Simple structure, easy to control | High cost, poor universality |
| Focusing single cell | Simple optic path, more controllable compression | Poor stability under high-energy condition |
| Compact two-cell | Longer effective interaction length, can obtain higher compression ratio | Poor stability under high-energy condition |
| Independent two-cell | Strong flexibility | Complicated optical path, large loss |
| Non-focusing structure | Strong stability, suitable for high-power large-aperture laser system | There are pump source modulation problems and threshold problems |
Summary of the advantages and disadvantages of each structure.
Unfolding the Hidden Spatial Degree of Freedoms
Plasma-Based Stimulated Brillouin Scattering
In recent years, some research groups use plasma as the new SBS active medium for pulse compression and amplification. Due to the advantage of its non-destructive property, SBS pulse compression based on plasma can obtain extremely high peak power up to the order of 1015 W and ultrashort pulse of the order of femtosecond [96, 110–114]. In 2010, Lancia et al. achieved the energy transfer from a long (3.5 ps) pump pulse to a short (400 fs) seed pulse due to stimulated Brillouin backscattering in the strong-coupling regime with output energy of 60 mJ in N2 and Ar plasmas. The interaction process is shown in the Figure 10. They found that increasing the uniformity of plasma density can effectively reduce energy attenuation. At the same time, maintaining a high plasma density can increase the maximum amplification factor [96]. In 2013, Weber et al. used the strong coupling stimulated Brillouin technology in the plasma to obtain an amplified seed light with a peak power of 1018 W/cm2and a pulse width of 10 fs [113].
FIGURE 10
Experimental scheme showing the three laser beams focused at the center of a supersonic gas jet [96].
Stimulated Brillouin Scattering With Structured Light
To date, the great majority of SBS studies, as reviewed in above, neglected the spatial dimensions of paraxial light. This is because most commercial laser systems are designed to generate the TEM00 mode with a linear polarization for highly efficient generation. More recently, progress in the study on structured light, both in fundamental and application aspects, has significantly gained the research intertest in techniques for generation and manipulation of high-order spatial modes [36, 37]. For the nonlinear approach, OAM transfer between light fields in varies optical parametric processes have been intensively studied over 20 years [38], and the community is recently focus on nonlinear generation and transformation generalized spatial modes and associated full-field selection rules [39, 115], as well as the effect of spin-orbit coupling [116]. By contrast, SBS involving OAM carrying light was first studied in theory until 2009 [40], and the corresponding experimental demonstration only appeared the 5 years later [41]. Particularly, Zhu et al. systematically studied OAM selection rules in varies SBS processes, and first realized OAM interconversion between light and acoustic fields, a high-dimension light memory, and revealed the underlying physics for the fragmentation of vortex beams in SBS-PCMs [28, 39], as shown in Figure 11.
FIGURE 11
Realization of OAM interconversion between light and sound waves via SBS (A) and demonstration of fragmentation of vortex beams in an SBS-PCM (B) [28, 39].
For vectorial spatial modes, the first theoretically study for amplification of cylindrical vector (CV) modes was provided by Vieira et al. [42], only 1 year later, Zhu experimentally realized a strong (100 mJ at 300 ps) CV-mode laser output via SBA [43]. Besides, it is worthy to note that the structured acoustic wave generated in SBS excited by structured light, owing to its 0-spin and low group velocity, has a great potential for generation and transformation of structured light, and especially for applications regarding to strong laser pulses. For instance, ref. 120 predicted a “high OAM harmonic generation in cascading SBS/SRS on a specific acoustic wave. Remarkably, some novel nonlinear optical phenomena have been revealed in these few works, yet the underlying physics for the transformation of spatial modes in SBS has not been fully understanded to date. In a word, the SBS science with structured light is still in its infancy.
Summaries
Due to the advantages of simple structure, low cost, and excellent beam quality of output pulse among others, pulse compression based on SBS has become one of the effective means to obtain picosecond pulses. This review gives a comprehensive overview of the research progress of SBS pulse compression with different structures. In addition, gain media also have a significant impact on the compression characteristics of SBS. At present, the more common Brillouin media are mainly solid media such as fused silica, K8 glass and liquid media such as perfluorocarbon series and water. Among them, the solid media has good thermal conductivity and no thermal convection effect, but its damage threshold is relatively low. As a new solid gain medium discovered in recent years, diamond crystal has attracted extensive attention because of its high Brillouin gain coefficient, high thermal conductivity, and wide spectral transmission range [117–120]. Once it breaks through the size limit, its application prospect in SBS pulse compression will be very promising. As a new type of Brillouin medium discovered in the last decades, the perfluorocarbon series of liquids have excellent performance and low cost, therefore are currently the mainstream Brillouin medium in high energy pulse compression. In general, since Stokes beam with narrow pulse width can be easily obtained, media with short phonon lifetime and high gain coefficient are popular. However, based on recent experimental results, our research group found that the medium which has a short phonon lifetime and high gain (such as HT-230) will cause the compression limit point to be generated prematurely, and then the pulse width broadening phenomenon and even the cascaded SBS phenomenon will occur.
At present, more attention to SBS-based pulse compression and amplification studies has been paid to narrower pulse width output with higher repetition rate and higher energy. Since the traditional focusing structure and active medium are limited by the damage threshold, it is difficult to make major breakthroughs with an aspect of pulse intensity. Therefore, the researches on non-focusing structures and new active media have guiding significance. The non-focusing structure can greatly improve the stability of the entire system and the injected energy, and obtain short pulses with high beam quality. It is extremely suitable for high-power large-aperture laser systems. Chirped-pulse amplification technology (CPA) and optical parametric chirped-pulse amplification technology (OPCPA) have been unable to achieve further breakthroughs because of the limitation of the optical damage threshold of compressed gratings [121–125]. At the same time, the reversibility of photoacoustic conversion in the SBS process has been reported, and it also has application value in communication [126]. Although the above-mentioned strong coupling stimulated Brillouin scattering technology implemented in plasma has obtained extremely high peak power and ultra-short pulse width, this method is hard to manipulate, and has extremely high requirements for the experimental environment and the precision of the devices. Therefore, the plasma-based SBS pulse compression technology still needs in-depth research. The breakthroughs of this technology will significantly promote research work and practical applications in the field of basic science.
Statements
Author contributions
CC: Writing-Original Draft, Writing-Review and Editing. YW: Supervision, Funding acquisition, Writing-Review and Editing. ZB: Supervision, Writing-Review and Editing. YL: Writing—Review and Editing. YY: Writing—Review and Editing. ZL: Supervision, Funding acquisition.
Funding
This work was supported by the National Natural Science Foundation of China (Nos. 62075056, 61927815, and 61905061).
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher’s note
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Summary
Keywords
stimulated Brillouin scattering, pulse compression, high energy, picosecond, structure
Citation
Cao C, Wang Y, Bai Z, Li Y, Yu Y and Lu Z (2021) Developments of Picosecond Lasers Based on Stimulated Brillouin Scattering Pulse Compression. Front. Phys. 9:747272. doi: 10.3389/fphy.2021.747272
Received
26 July 2021
Accepted
30 August 2021
Published
14 September 2021
Volume
9 - 2021
Edited by
Zhi-Han Zhu, Harbin University of Science and Technology, China
Reviewed by
Wei Gao, Harbin University of Science and Technology, China
Yanping Xu, Shandong University, China
Xing Fu, Tsinghua University, China
Updates
Copyright
© 2021 Cao, Wang, Bai, Li, Yu and Lu.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Yulei Wang, wyl@hebut.edu.cn
This article was submitted to Optics and Photonics, a section of the journal Frontiers in Physics
Disclaimer
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