1164.4 nm and 1174.7 nm dual-wavelength Nd : GdVO4/Cr4+ : YAG/YVO4 passively Q-switched Raman microchip laser.

Abstract

A synchronous pulsed, dual-wavelength Raman laser at 1164.4nm and 1174.7nm has been demonstrated in a Nd:GdVO4/Cr4+:YAG/YVO4 passively Q-switched Raman microchip laser (PQSRML). The 1164.4nm and 1174.7nm dual-wavelength first-order Stokes laser oscillation is attributed to the conversion of the 1063.2nm and 1063.43nm two-longitudinal-mode fundamental lasers with Raman frequency shifts of 816 cm-1 and 890 cm-1, respectively. Stable dual-wavelength Raman laser pulses with nearly equal spectral intensities have been achieved independent of the pump power. A pulse repetition rate as high as 139.4kHz has been achieved with T0=85%, and the pulse width has been shortened to 825ps with T0=70%. A dual-wavelength Raman laser with sub-nanosecond pulse width and peak power of over 1kW has been achieved in the Nd:GdVO4/Cr4+:YAG/YVO4 PQSRML.