BRIEF RESEARCH REPORT article
Adv. Opt. Technol.
Sec. Applied Photonics
A Fiber-Delivered, Multi-Line Nanosecond Source for Single-Shot Spectro-Polarimetric Scattering Measurements
Provisionally accepted
Ben Urban1*
Thomas Livecchi2,3- 1Shimane University, Matsue, Japan
- 2Colgate Palmolive Co, Piscataway, United States
- 3Rutgers University New Brunswick, New Brunswick, United States
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We report a nanosecond, multi-line laser source that preserves partial linear polarization after transmission through a 100 m large-core graded-index (GRIN) fiber. The system generates narrow emission lines between 473 and 600 nm, evenly spaced by the silica Raman shift of ~440 cm⁻¹, from a Q-switched nanosecond pump coupled into the fiber. Despite multimode propagation, the cascaded beams emerge close to diffraction-limited Gaussian profiles due to nonlinear mode self-cleaning, while the residual pump remains multimode. Across the emission lines, the degree of linear polarization (DoLP) ranges from 0.1 to 0.6 depending on wavelength. As an application, we demonstrate single-shot, multi-wavelength spectro-polarimetric reflectance, simultaneously measuring DoLP at all cascaded lines. To our knowledge, this is the first demonstration of wavelength-dependent polarization retention through a 100 m large-core GRIN fiber.
Keywords: fiber laser, Polarization - Methods, Raman, gaussian, GRIN fiber
Received: 27 Aug 2025; Accepted: 28 Oct 2025.
Copyright: © 2025 Urban and Livecchi. 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) or licensor 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: Ben Urban, burban83@gmail.com
Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.