1164.4 nm and 1174.7 nm dual-wavelength Nd : GdVO 4 /Cr 4+ : YAG/YVO 4 passively Q-switched Raman microchip laser.

A synchronous pulsed, dual-wavelength Raman laser at 1164.4 nm and 1174.7 nm has been demonstrated in a Nd:GdVO4 /Cr4+ :YAG/YVO4 passively Q-switched Raman microchip laser (PQSRML). The 1164.4 nm and 1174.7 nm dual-wavelength first-order Stokes laser oscillation is attributed to the conversion of the 1063.2 nm and 1063.43 nm 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 139.4 kHz has been achieved with T0 =85%, and the pulse width has been shortened to 825 ps with T0 =70%. A dual-wavelength Raman laser with sub-nanosecond pulse width and peak power of over 1 kW has been achieved in the Nd:GdVO4 /Cr4+ :YAG/YVO4 PQSRML.