报道了808 nm连续半导体泵浦全固态Nd:YVO4线性调频激光器实验研究。利用优化谐振腔长度、腔内插入倾斜标准具, 采用温度控制、机械减震和隔绝外部环境等稳频操作,实现了稳定的1 064 nm单频激光输出, 最大输出功率140 mW。利用法柏干涉仪观察单频输出, 并利用刀口法测量得到的基模高斯光束质量M2为1.05。在谐振腔内插入RTP电光晶体并连接外部高压电源, 通过线性电光效应改变谐振腔长度以及改变标准具倾斜角度避免腔长调节过程中的模式跳频, 实现了1.35 GHz的稳定线性调频激光输出。编程控制高压电源给RTP晶体施加幅值为2 200 V的锯齿波形电压, 实现了频率20 Hz, 平均输出功率为85 mW周期性的调频信号输出。

The investigation on 808 nm CW laser-diode pumped all solid-state linearly tunable Nd:YVO4 laser was conducted in this paper. By utilizing methods of short cavity, inclined thin etalon and frequency stabilization including gain medium temperature control, mechanical vibration damping of the laser base and aerial isolation of external turbulence and noises, single frequency laser output at 1 064 nm was achieved with a maximum output power of 140 mW. Frequency characteristics was monitored by a Fabry-Perot interferometer and beam density distribution was also scanned, beam quality M2 was measured to be about 1.05 by knife technique. Electro-optical RTP crystal was fixed in the cavity and connected to a high power source, which allowed cavity length modulation by linear electro-optical effect. During the cavity length tuning process, mode hops were avoided by the real time angle tilting of the thin etalon. Frequency tuning range of the 1 064 nm laser reaches 1.35 GHz. Programed saw-tooth with a 2 200 V amplitude was further applied on the RTP and a 20 Hz periodical linear frequency tuning laser with an average power of 85 mW was obtained.