End-pumped Nd: The Yvo <sub> 4 </ Sub> Active And Passive Tone, Q-switched Laser Experimental Study

With the rapid development of LD pumped all-solid-state laser, laser Q-switch has become a focus of the new technology. We use the laser diode (LD) pumped with a fiber-coupled output of solid-state laser as the pump source, laser crystal Nd:YVO4 as a laser material, the use of end-pumped Nd:YVO4 laser crystal, using acousto-optic active Q-switch and Cr4+:YAG saturable absorber passive Q-switch as Q-switch components of the laser 1064nm, the laser output pulse characteristics were analyzed. The main points of this paper can be summarized as follows:1. Review of LD pumped solid-state laser development process, the type of the laser material, the way of the pump laser, the thermal effect of the laser and Q-switch theoretical foundation.2. Detailed analysis the characteristics of the LD end-pumped Nd:YVO4 laser crystal with the acousto-optic active Q-switch, had measured the average power, pulse width and peak-power of the repetition frequency in the 10kHz.3. Detailed analysis the characteristics of the LD end-pumped Nd:YV04 laser crystal with the Cr4+:YAG saturable absorber passive Q-switch, had measured the Cr4+:YAG saturable absorption characteristics and analyzed different transmission of Cr4+:YAG at 80% and 60%.4. Research in the LD end-pumped Nd:YVO4 laser crystals, using acousto-optic active Q-switch and Cr4+:YAG passive Q-switch double loss of the laser cavity. When the pump power of 23W, acousto-optic active Q-switch repetition rate of 10kHz, the use of transmittance of 80% of the Cr4+:YAG passive Q-switch, obtained the peak-power of 9.3kW and stability pulse width of 14ns.