Spaceborne lidar for ocean vertical profile detection requires a narrow linewidth pulsed laser source with a wavelength of 486.134 nm, which coincides with the H-β Fraunhofer absorption line. An injection-seeded optical parametric oscillator (OPO) is developed to meet this requirement. The 355 nm ultraviolet (UV) laser obtained from a 1064.4 nm Nd:YAG nonplanar ring oscillator (NPRO) after multi-stage cascade amplification and frequency tripling is used as the pump source for the OPO. The OPO is a single-resonant three-mirror ring cavity structure with a critical phase-matched β-barium borate (BBO) as the nonlinear crystal. A 486.134 nm continuous-wave (CW) single-frequency laser obtained by frequency doubling of a 972.268 nm laser diode (LD) with a linewidth of less than 100 kHz is injected into the OPO as a seed source. With an incident 355 nm pump energy of 58.4 mJ, a signal pulse energy of 23.8 mJ and pulse width of 5.05 ns is obtained, with the pump to signal conversion efficiency of 40.7%. The central wavelength of the signal pulse is 486.134 nm, and the corresponding spectral linewidth is 0.017 nm, with the measured wavelength stability over 30 minutes of less than 11 MHz.
A compact, discrete path Nd:YAG Innoslab amplifier system was presented. At a repetition rate of 12.7 W amplified output power was achieved successfully with the seed power of 2.7 W. The corresponding extraction efficiency was 14.2%.
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