基于RTP晶体的271cm-1拉曼频移五阶斯托克斯激光OA北大核心CSTPCD

The RbTiOPO4 crystal Raman emission at high-order Stokes with 271 cm-1 shift driven by an end-pumped passively Q-switched laser was demonstrated.The Nd:YAG and Cr4+:YAG bonding design was used to reduce the intracavity loss and make the laser system compact,so as to raise the intracavity photon density,which proved helpful for the conversion of Raman shift to high-order Stokes light.The first-Stokes laser with different Raman shifts is designed to oscillate in different cavities,and the first-Stokes laser with 687 cm-1 shift is suppressed by using the difference in cavity mode matching with the fundamental laser,and the fifth-order Stokes laser with 271 cm-1 shift is obtained.Under the pump power of 8.1 W,a 1 244 nm wavelength laser with an average output power of 230 mW was obtained,and the corresponding pulse width and pulse frequency repetition were 2.9 ns and 11.7 kHz,respectively.The 1 244 nm laser wavelength perfectly matched the OH-1 absorption peak in water,which could have significant applications in fields such as surface vegetation and planetary water detection.