用饱和光谱和laser的sub-kHz扫描方法研究1，5 μm区H13C14N氰化氢跃迁的绝对频率
Absolute frequencies of H13C14N hydrogen cyanide transitions in 1,5 μm region with saturated spectroscopy and sub-kHz scanning laser
摘要：
其振转光谱中的宽跨度和高密度线使氰化氢成为一种有用的光谱介质，用于在光通信和尺寸计量中参考激光的绝对频率。我们首次测定了H1, 3C 14 N同位素在1526 ~ 1566 nm范围内的分子跃迁中心频率，其不确定度为1.3e-10。我们用高相干宽调谐扫描激光器通过光学频率梳精确地参考氢脉泽研究了分子跃迁。我们证明了一种方法来稳定的操作条件，需要保持恒定的低压力的氰化氢进行饱和光谱与三次谐波同步解调。我们证明了约40倍的改善线中心的分辨率相比，以前的结果。
英文摘要：
The wide span and high density of lines in its rovibrational spectrum render hydrogen cyanide a useful spectroscopic media for referencing absolute frequencies of lasers in optical communication and dimensional metrology. We determined, for the first time to the best of our knowledge, the molecular transitions' center frequencies of the H13C14N isotope in the range from 1526 nm to 1566 nm with 1,3e-10 fractional uncertainty. We investigated the molecular transitions with a highly coherent and widely tunable scanning laser that was precisely referenced to a Hydrogen maser through an optical frequency comb. We demonstrated an approach to stabilize the operational conditions needed to maintain the constantly low pressure of the hydrogen cyanide to carry out the saturated spectroscopy with the third-harmonic synchronous demodulation. We demonstrated approximately a fourtyfold improvement in the line centers' resolution compared to the previous result.
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