Abstract

A synchronous pulsed, dual-wavelength Raman laser at 1164.4 nm and 1174.7 nm has been demonstrated in a $\mathrm{Nd}\text{:}{\mathrm{GdVO}}_4/{\mathrm{Cr}}^{4+}\text{:}\mathrm{YAG}/{\mathrm{YVO}}_4$ 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 $816{\mathrm{cm}}^{-1}$ and $890{\mathrm{cm}}^{-1}$, 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 $T_0=85\%$, and the pulse width has been shortened to 825 ps with $T_0=70\%$. A dual-wavelength Raman laser with sub-nanosecond pulse width and peak power of over 1 kW has been achieved in the $\mathrm{Nd}\text{:}{\mathrm{GdVO}}_4/{\mathrm{Cr}}^{4+}\text{:}\mathrm{YAG}/{\mathrm{YVO}}_4$ PQSRML.

© 2018 Optical Society of America

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