Wavelength-tunable near-infrared LiCAF:Cr lasers for biochemistry and substance detection
Alexey S. Nizamutdinov1, Radik D. Aglyamov1, Alexander K. Naumov1, Alexey A. Shavelev1, Oleg A. Morozov1,2, Andrey A. Sergeev3, Anastasiya P. Pogoda3, Vadim V. Semashko1,2; 1Kazan Federal University, Kazan, Russia; 2Kazan Scientific Center of RAS, Zavoisky Physical-Technical Institute, Kazan, Russia ;3Baltic State Technical University “VOENMEH” named after D. F. Ustinov, Saint-Petersburg, Russia
Abstract
A scheme of a high-power Cr:LiSAF laser operating in active Q-switching mode with a Pockels cell is developed. A method for shortening the laser pulse duration and increasing the peak power by means of intracavity transverse mode selection using an aperture diaphragm and external feedback with Bragg grating is proposed. As a result, the duration of the laser pulse was 19 ns and the pulse energy of 7.7 mJ, which corresponds to 0.41 MW of peak power at the central wavelength of 830 nm. The laser wavelength tuning was also adjusted in the range of 825–865 nm with a width of 2 nm. The developed laser system can be realized with Cr:LiCAF active media, providing wavelength tunable laser output at shorter wavelengths. These systems will serve as a basis for the development of new systems for optoacoustic tomography with better spatial resolution and lower cost of ownership. Also these systems are advantageous in environmental monitoring of the atmosphere or fluorescent detection of molecules.
Speaker
Alexey Nizamutdinov
Kazan Federal University
Russian Federation
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