Optical frequency comb-based cavity-ringdown spectroscopy has recently enabled high-sensitivity absorption detection of molecules over a broad spectral range. We demonstrate an improved system based on a mode-locked erbium-doped fiber laser source centered at 1.5 (mu)m, resulting in a spectrometer that is inex-pensive, simple, and robust. It provides a very large spectral bandwidth (1.45-1.65 (mu)m) for investigation of a wide variety of molecular absorptions. Strong molecular absorptions at 1.5 (mu)m allow for detection at sensitivities approaching the 1 part in 10~(9) volume level. We provide a detailed description of our spectrometer and present measurements of the rovibrational spectra for CO, NH_(3), and C_(2)H_(2) with an absorption sensitivity of 2 X 10~(-8) cm~(-1) Hz~(-1/2) per detection channel.
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机译：基于光频率梳的腔衰荡光谱技术最近已实现了在宽光谱范围内分子的高灵敏度吸收检测。我们展示了一种改进的系统，该系统基于以1.5μm为中心的锁模掺-光纤激光源，从而使光谱仪不昂贵，简单且坚固。它提供了非常大的光谱带宽（1.45-1.65μm），用于研究各种分子吸收。 1.5μm的强分子吸收使得可以在接近10〜（9）体积水平1分的灵敏度下进行检测。我们将对光谱仪进行详细描述，并提供吸收灵敏度为2 X 10〜（-8）cm〜（-1）的CO，NH_（3）和C_（2）H_（2）振动光谱的测量结果。 ）Hz〜（-1/2）每个检测通道。
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