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arXiv 1706.08445physics.optics
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光谱指纹区宽带双梳光谱

Broadband Dual-Comb Spectroscopy in the Spectral Fingerprint Region

O. Kara, L. Maidment, T. Gardiner, P. G. Schunemann, D. T. Reid

AI总结:

本研究利用飞秒OPO将双梳光谱扩展到6-8微米指纹区,通过快速采集干涉图实现保持线形的平均,在1285-1585 cm-1范围内以约0.3 cm-1分辨率获得H2O和CH4的高保真光谱。

摘要:

6-12微米光谱指纹区的红外光谱具有最大的分子吸收截面,可实现灵敏、定量和物种特异性的测量。在此,我们展示了如何利用飞秒光学参量振荡器(OPOs)将双梳光谱——一种无移动部件、能够实现非常高分辨率的高速傅里叶变换光谱形式——扩展到6-8微米波段。通过以快于OPO梳齿相互退相干时间的方式采集双梳干涉图,我们实现了保持线形的平均,从而在1285-1585 cm-1范围内以约0.3 cm-1的分辨率获得了H2O和CH4的低噪声、高保真光谱。

英文摘要:

Infrared spectroscopy in the spectral fingerprint region from 6-12 um accesses the largest molecular absorption cross-sections, permitting sensitive, quantitative and species-specific measurements. Here, we show how dual-comb spectroscopy--a form of high-speed Fourier-transform spectroscopy involving no moving parts and capable of very high resolutions--can be extended to the 6-8um wavelength band using femtosecond optical parametric oscillators (OPOs). By acquiring dual-comb interferograms faster than the mutual decoherence time of the OPO combs we implement line-shape-preserving averaging to obtain low-noise, high-fidelity spectra of H2O and CH4 at approximately 0.3 cm-1 resolutions from 1285-1585 cm-1.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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