波长锁定878.6 nm LD调制泵浦Nd:YVO_(4)自拉曼激光器

Efficient wavelength-locked 878.6 nm diode-modulated-pumped Nd: YVO_(4)self-Raman laser

报道了一款基于调制共振泵浦技术的Nd:YVO_(4)自拉曼激光器。针对全固态自拉曼激光器中热效应严重导致的激光器输出功率及光光效率普遍偏低的问题,合理地将共振泵浦技术和调制泵浦技术相结合,实现了激光器的有效热管控,缓解了激光器的热效应,提高了泵浦上限,从而实现了激光器输出功率和光光效率的大幅提高。当泵浦源的调制频率为10 kHz、占空比为40%、平均泵浦功率为30 W、声光Q开关的调制频率为100 kHz时,获得了最大平均功率为8.57 W的1 176 nm斯托克斯光输出,相应光光转换效率28.6%。相较于相同泵浦功率的连续泵浦机制下的实验结果,斯托克斯光平均输出功率提高了42%,光光效率提高了8.5%。实验结果表明:共振泵浦和调制泵浦技术相结合的方式可以有效缓解热效应,提高泵浦功率上限,从而提高自拉曼激光器的输出功率和光光效率。

An in-band pumped and diode-modulated-pumped Nd:YVO_(4)self-Raman laser was demonstrated.Aiming at the problem of low output power and optical conversion efficiency caused by thermal effect in all-solid self-Raman laser, the in-band pump and diode-modulated pump schemes were both adopted to mitigate the thermal effects and increased the upper limit of the pump power, so as to improved the output power and optical conversion efficiency of the Nd:YVO_(4)self-Raman laser greatly. With a diode-pump modulation frequency of10 kHz and duty cycle of 40%, the maximum average power of 8.75 W Stokes wave output at 1 176 nm was obtained under a diode pump power of 30 W at a pulse repetition frequency(PRF) of 100 kHz. The corresponding optical conversion efficiency was 28.6%. Compared with the experimental results under the continuous pumping mechanism with the same pump power, the average output power of Stokes wave was improved by 42%, with the optical conversion efficiency improved by 8.5%. The experimental results show that the combination of in-band pump and diode-modulated pump schemes can effectively mitigate the thermal effect and increase the upper limit of pump power, so as to improve the output power and optical conversion efficiency of the self-Raman laser.