钒酸钇晶体皮秒拉曼放大器特性的研究

Research of Picosecond Raman Amplifier in YVO_4 Crystal

报道了钒酸钇晶体(YVO4)作为拉曼放大器时的性能。观察到拉曼放大器中的自净化作用对拉曼光光束质量的改善。通过改变抽运脉宽,在3组不同脉宽的抽运条件下,分别进行了拉曼放大实验。实验结果表明抽运脉宽越宽,越有利于拉曼种子光与抽运光之间的延时调节。通过改变拉曼种子光与拉曼抽运光两者的夹角,研究了其对拉曼放大器的影响。结果表明利用四波混频实现的拉曼放大对于角度的变化很敏感。最终分别在不同的入射光夹角情况下获得了正三阶和反三阶拉曼斯托克斯光,并与计算所得的谱线进行了对比。

The performance of YV04 crystal as Raman amplifier is reported. The beam quality of Raman Stokes light is improved due to Raman ＂cleanup＂ in the amplification stage. Then, by changing the pump pulse width, the experiment is carried out in three different pulse width conditions. The experimental results show that the wider the pump pulse is, the more easily the pump-seed delay is adjusted. By changing the incident angle between seed and pump light, its influence on the performance of Raman amplifier is also studied. Raman amplifier based on four wave mixing （FWM） is very sensitive to the change of the incident angle. Third order Stokes and third order anti-Stokes Raman lights are obtained at different incident angles, and the spectral composition of all the Raman Stokes is identified to the calculated Raman Stokes spectral composition.