高稳定性低噪声的561nm黄光激光器

摘要

In view of current high noise of domestic 561 nm laser,affecting its practicality,561 nm yellow laser with high stability and low noise is proposed.Nd ∶ YAG crystal is used to obtain 1 123 nm fundamental frequency light,and output of LBO crystal is 561 nm.Threshold pump power of 1 112 nm,1 116 nm and 1 123 nm wavelength is analyzed theoretically,and a single wavelength oscillation condition of 1 123 nm is proposed to determine requirements of resonant cavity coating.According to theoretical calculation,a reasonable resonant cavity system is designed,and single-wavelength oscillation of 1 123 nm line is realized by suppressing oscillation of 1 112 nm and 1 116 nm lines in the resonator.At a pump power of 5 W,561 nm laser single wavelength output is achieved with an output power of 107 mW,power instability of 0.7％ and noise of 1.2 ％.%鉴于目前561 nm激光器噪声较大,影响其实用性,提出一种高稳定性低噪声的561 nm黄光激光器.利用Nd∶YAG晶体得到1 123 nm基频光,通过LBO晶体腔内倍频得到561 nm输出.理论分析了1 112 nm、1 116 nm与1 123 nm波长的阈值泵浦功率,提出1 123 nm的单波长振荡条件,确定谐振腔镀膜要求.根据理论计算,设计了合理的谐振腔膜系,通过抑制1 112 nm与1 116 nm谱-线在谐振腔内的振荡实现1 123 nm谱线的单波长振荡.在泵浦功率为5W时,实现了561 nm激光单波长输出,输出功率达到107 mW,功率不稳定性达到0.7％,噪声为1.2％.