AUTHOR=Wang Qing , Wang Runyu , Yang Fan , Li Yan 

TITLE=Wavelength-Tunable Kerr-Lens Mode-Locked Femtosecond Cr:ZnS Laser With a ∼300-nm Tuning Range From 2.2 to 2.5 μm

JOURNAL=Frontiers in Physics

VOLUME=Volume 10 - 2022

YEAR=2022

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2022.912196

DOI=10.3389/fphy.2022.912196

ISSN=2296-424X

ABSTRACT=Tunable 2~3-μm femtosecond lasers are highly interested in various applications, such as medical diagnostics and molecular spectroscopy. Cr:ZnSe/ZnS are extremely suited for broadband tunable femtosecond lasers due to their excellent emission bands. In this paper, we demonstrate a wavelength-tunable Kerr- lens mode-locked Cr:ZnS laser by utilizing a birefringent filter. The Group Delay Dispersion of the operation and thickness of the birefringent are finely optimized. With the rotation of the birefringent filter, the scheme offers a tuning bandwidth over 300 nm from 2220 nm to 2520 nm. To the best of our knowledge, it is the broadest tuning range in reported femtosecond Cr:ZnS lasers.