Study On Ld End-Pumped High Repetition1.34μm Laser

LD end-pumped high repetition1.34μm laser provides with broad applications in national defense and military, medical operations and so on.This thesis is mainly to design an LD pumped acousto-optic Q-switched laser, which has high repetition rates and narrow pulse width, The rate equation of LD end-pumped high repetition1.34μm laser was put forward and solved.The relationship between the single pulse energy、pulse width、peek power and repetition rate was established. It guided the choice of component and the design of laser cavity and provided theory basis to analyzing experimental phenomenon;Used COMSOL to analyze thermodynamics parameters between traditional Nd:YV04crystal and composite Nd:YVO4crystal.Calculated the thermal focal length of composite Nd:YVO4crystal. The accuracy of calculation was verified and it supported the design and optimization of laser cavity.Based on theoretical study, LD pumped acousto-optic Q-switched laser was designed.At the pump power of14.46W,the average output power of1.34μm laser was4.5W, the optical-to-optical efficiency was31.14%.At the repetition rate of10kHz,the average output power was1.72Wand the pulse width was49.3ns; At the repetition rate of100kHz,the average output power was2.8W and the pulse width was153.6ns; the optical-to-optical efficiency were19.36%,respectively.