谐波探测在Cs原子饱和吸收光谱中的应用

使用低频波长调制和高次谐波探测来测量Cs原子D₂线6S_1/2(F=4)→6P_3/2(F’=3、4、5)跃迁的方法,对谐波信号的展宽特性和灵敏度进行了分析.结果显示,减小调制电压可以压窄线宽,提高分辨率;在一定范围内增大调制电压可以提高谐波信号强度,提高测量灵敏度;提高分辨率要以损失灵敏度为代价.提高谐波次数可以提高分辨率.高次谐波可以获得高的灵敏度和分辨率.

Application of Harmonic Detection in Saturated Absorption Spectra of Cs

Low frequency voltage modulation and harmonic detection are used to measure the saturated absorption spectra (SAS) of 6S_1/2 (F=4)→6P_3/2 transition of the cesium D₂ line. The broaden property and sensitivity of harmonic signals are analyzed. It is shown that reducing the modulation voltage can result in narrower linewidth, while increasing the modulation voltage suitably can lead to higher sensitivity. Increasing of resolution will go with the loss of sensitivity. Increasing of harmonic order will lead to higher resolution. Harmonic detection is helpful to achieve higher sensitivity and resolution.