Subject of study. The lasing spectra of a pulsed laser based on a Cr:LiSrAlF6 active medium are studied. Method. An intracavity transmission volume Bragg grating was used as the lasing mode on two aliquant wavelengths and wavelength tuning. The grating was recorded in a photo-thermo-refractive glass. Main results. For the first time in Russia, simultaneous narrowband lasing was demonstrated at two aliquant wavelengths in the band of 795-895 nm in a Cr:LiSrAlF6 crystal. The use of a volume transmission Bragg grating for continuous tuning of the central wavelength of the generated laser emission was demonstrated using additional feedback through a mirror with a high reflection coefficient positioned in the first diffraction order. Practical significance. Pulsed lasers with tunable wavelengths are applied in various scientific and practical applications including ecological monitoring of atmosphere conditions. The lasing at two aliquant wavelengths investigated in this study enables the design of high-power pulsed sources of terahertz radiation in the range of 15.5-27.1 THz. (C) 2022 Optica Publishing Group
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