Quasi-continuous wave solid-state Raman laser system generating 22 lines from the ultraviolet to near infrared

Lasers based on stimulated Raman scattering (SRS) of light in crystals (Raman lasers) are promising sources of radiation in wide spectral region. Using such lasers, an efficient quasi-continuous wave (quasi-CW) laser system generating multi-wavelength radiation is developed. Laser system is based on a quasi-CW nanosecond lamp-pumped Nd:YAG laser with acousto-optic Q-switching, Raman lasers on barium nitrate and KGW crystals and nonlinear crystal optical converters. Pulse repetition rate of the system is equal to 1 or 4 kHz. Raman lasers are excited with the focused radiation at 532 nm or 1064 nm using the two-pass pumping scheme. Thermal lens induced in the crystals due to SRS is diminished substantially by applying concave spherical mirrors of Raman laser resonator and efficient heat removal.