El Amili Abdelkrim, Alouini Mehdi
Opt Lett. 2015 Apr 1;40(7):1149-52. doi: 10.1364/OL.40.001149.
The cancellation of resonant intensity noise, from a few kHz up to several GHz, is reported using a second-harmonic generation (SHG) buffer reservoir in a Nd:YAG solid-state laser. This approach is shown to be well suited and easily optimizable for reducing the excess noise lying at the laser relaxation oscillations as well as that originating from the beating between the lasing mode and nonlasing adjacent longitudinal modes. A thorough analysis of noise spectra of both laser and SHG signals confirms definitely that noise reduction is a consequence of a deep laser dynamics modification rather than noise evacuation mechanism.
据报道，在Nd:YAG固态激光器中使用二次谐波产生（SHG）缓冲储能器可消除从几kHz到几GHz的共振强度噪声。结果表明，这种方法非常适合且易于优化，可减少激光弛豫振荡处的过量噪声以及激光模式与非激光相邻纵向模式之间拍频产生的噪声。对激光和SHG信号的噪声谱进行的全面分析明确证实，降噪是激光动力学深度改变的结果，而非噪声消除机制。
