Ultrahigh-resolution spectrometer for the 5-microm wavelength region.
Ultrahigh-resolution spectrometer for the 5-microm wavelength region.
复制标题
适用于 5 微米波长区域的超高分辨率光谱仪。
作者：
P. Palm;D. Hanke;W. Urban;M. Mürtz
我们提出了一种超高分辨率饱和光谱仪的基础上，线可调谐一氧化碳激光器近60太赫兹（λ = 5微米）。CO基带跃迁的光谱分辨率达到14 kHz（Dnu/nu = 2.3 × 10（-10）），比以前的结果提高了一个数量级。利用可调谐微波边带的锁频方案提供了在千赫兹上的CO激光器的可调谐性和绝对频率控制。通过使用扩展的激光束在24-m的吸收池中的压力下降到0.01Pa的过渡时间加宽和压力加宽的观察到的转变显着减少。新的光谱仪是适合的饱和线形状的研究和新一代频率标准的发展在60太赫兹区域。
We present an ultrahigh-resolution saturation spectrometer based on a line-tunable carbon monoxide laser near 60 THz (lambda = 5 microm). A spectral resolution of 14 kHz (Dnu/nu = 2.3 x 10(-10)) for CO fundamental-band transitions was achieved, which improves on earlier results by one order of magnitude. A frequency-locking scheme using tunable microwave sidebands provides tunability and absolute frequency control of the CO laser on the kilohertz. Transit-time broadening and pressure broadening of the observed transitions are significantly reduced by use of expanded laser beams in a 24-m absorption cell at pressures down to 0.0 1Pa. The new spectrometer is suitable for the study of saturation line shapes and the development of a new generation of frequency standards in the 60-THz region.