光谱仪联合使用提高谱线的测量宽度

Spectral Linewidth Measurement Enhancement by Two United Spectrometers

为了提高光谱仪测量谱线的精度,推导出计算机自动控制多光栅转动的光谱仪测试系统的角色散率、线色散率和分辨本领等参量公式,提出一种将两台光谱仪联合使用以提高谱线测量精度的测量方法。理论分析了两台光谱仪联合测激光线宽的原理,并用两台光谱仪联合使用对He-Ne激光谱线宽度进行了测量。实验结果表明,两台光谱仪联合测量He-Ne激光谱线的半峰全宽的放大倍数3.38×105,比单台光谱仪测量至少可以将谱线宽度的测量精度提高5个数量级。

In order to improve the measuring precision of spectral line by spectrometer, the parameters of angle dispersive power, line dispersive power and resolving power of spectrometer with grating scanning controlled by computer have been calculated theoretically, and then a method has been put forward to improve the linewidth measurement by two united homogeneous spectrometers. The principle of measuring laser linewidth by two united spectrometers is analyzed theoretically, and the linewidth of He-Ne laser is measured. The experimental results shows amplification factor of full width at half maximum （FWHM） of He-Ne laser spectral line is 3.38 ×10^5 , and 5 order magnitude of the line width measurement is enhanced at least by the two united homogeneous spectrometers than only one.