Abstract
This paper presents a KGW Raman laser with an external-cavity configuration in the 2 μm region. The Raman laser is pumped by unique, electro-optic, actively Q-switched Tm:Yap laser, emitting at 1935 nm. The electro-optic modulation is based on a KLTN crystal, enabling the use of a short crystal length, with a relatively low driving voltage. Due to the KGW bi-axial properties, the Raman laser is able to lase separately at two different output wavelengths, 2273 and 2344 nm. The output energies and pulse durations for these two lines are 0.42 mJ/pulse at 18.2 ns, and 0.416 mJ/pulse at 14.7 ns, respectively. This is the first implementation of a KGW crystal pumped by an electro-optic active Q-switched Tm:Yap laser in the SWIR spectral range.
Highlights
Lasers emitting at 2–3 μm enhance a wide variety of applications because of their relatively high absorption coefficients and the interesting atmospheric window at this spectral range
Raman lasers leverage the principles of stimulated Raman scattering (SRS) to shift the light that comes into the crystal by a frequency corresponding to the vibrational frequency of the material
In 2018 we reported the first Raman laser in the 2 μm region based on a KGW crystal
Summary
Lasers emitting at 2–3 μm enhance a wide variety of applications because of their relatively high absorption coefficients and the interesting atmospheric window at this spectral range. They are used in LIDAR; microsurgery [1]; the processing of polymers, semiconductors, and metals [2]; defense applications; and gas sensing industries [3]. Pumping Raman cavities at very high peak power densities enables frequency conversion and produces new laser lines and useful high-brightness sources. This extends the spectral spans of existing lasers and fills the spectral gaps in this spectral range [4,5,6,7]. Raman lasers have a few more advantages, such as linewidth narrowing, pulse length shortening, and spatial beam quality improvement through Raman beam cleanup [8]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
