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

• DOI: 10.3389/fphy.2022.912196
• Publication Date: 2022-05-20T06:33:12Z
• Authors: Qing Wang; Runyu Wang; Fan Yang; Yan Li
• Keywords: Mode-Locking

Tunable 2∼3-μm femtosecond lasers are of high interest in various applications, such as medical diagnostics and molecular spectroscopy. Cr:ZnSe/ZnS is extremely suited for broadband tunable due to its excellent emission bands. In this article, we demonstrate a wavelength-tunable Kerr-lens mode-locked Cr:ZnS laser by utilizing birefringent filter. The group delay dispersion the operation thickness finely optimized. With rotation filter, scheme offers tuning bandwidth over 300 nm from 2,220 2,520 nm. To best our knowledge, it broadest range among reported lasers.