Nd:YVO_4自锁模皮秒激光器

Nd:YVO_4 self-mode-locked picosecond laser

设计并研究了Nd:YVO_4自锁模皮秒激光器,探究了激光器的最佳锁模条件。观察并分析了自锁模皮秒激光器准周期锁模、倍周期锁模状态,研究并测量了结构紧凑的直腔自锁模激光器的输出特性。谐振腔为凹平直腔,Nd:YVO_4晶体作为激光增益介质和克尔介质,在未加其他锁模元件的情况下,实现了1064 nm高效率连续锁模脉冲激光输出。晶体距输入镜16 mm、腔长为90 mm时,对1 064 nm透过率分别为10%、20%、30%和50%的四种输出镜下激光器的输出特性进行了对比分析。对激光器进行优化设计,输出镜透过率为10%,泵浦功率为8 W时,激光器输出功率为2.76 W,斜效率高达43.2%,锁模脉冲重复频率为1.43 GHz,激光器实现了高效、稳定的连续锁模。

The Nd：YVO4self-mode-locked picosecond laser was designed and studied, and also the best conditions of the mode-locked lasers were explored. The period-doubling self-mode-locked pulses and the quasi-periodic self-mode-locked pulses in the picosecond laser were observed and analyzed, and the output characteristics of the self-mode-locked laser with straight cavity in compact structure was studied and measured. The resonant cavity was concave flat chamber, under the condition of no other clamping device, the Nd ：YVO4crystal as a laser gain medium and Kerr medium, and the high efficiency continuous mode-locked 1 064 nm laser pulses were outputted. The Nd ：YVO4laser crystal is 16 mm from the input mirror, and the cavity length is 90 mm. The four kinds transmittance in 1 064 nm of output mirror are 10%, 20%, 30% and 50%, respectively, meanwhile the output characteristics of the laser were analyzed in comparison with different output mirrors. By optimizing the design, when the transmittance in1 064 nm of output mirror is 10%, the output power of the laser is 2.76 W at 8 W incident pump power,and the slope efficiency is up to 43.2%, the repetition rate of mode-locked laser is 1.43 GHz, the laser achieves a high powered and stable continuous wavelength mode-locked.