High-precision frequency measurements of the ν₁ + ν₃ combination band of ¹²C₂H₂ in the 1.5 μm region

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• 作者：C.S. Edwards ; G.P. Barwood ; H.S. Margolis ; P. Gill and W.R.C. Rowley
• 关键词：Molecular spectroscopy ; Laser frequency standards ; Optical telecommunications ; Diode laser spectroscopy ; Optical frequency metrology
• 刊名：Journal of Molecular Spectroscopy
• 出版年：2005
• 出版时间：November 2005
• 年：2005
• 卷：234
• 期：1
• 页码：143-148
• 全文大小：310 K

文摘

A pair of 1.5 μm semiconductor laser frequency standards have been developed for optical telecommunications use, stabilised to transitions of ¹²C₂H₂ and ¹³C₂H₂, using cavity-enhanced Doppler-free saturation absorption spectroscopy. The absolute frequencies of 41 lines of the ν₁ + ν₃ band of ¹²C₂H₂, covering the spectral region 1520–1545 nm, have been measured by use of a passive optical frequency comb generator, referenced to ¹³C₂H₂ transitions of known frequency. The mean experimental uncertainties (coverage factor k = 1) of the frequency values are 3.0 kHz (type A) and 10 kHz (type B). Improved values of the band origin ν₀, rotational constants B′ and B″, and centrifugal distortion coefficients D′, D″, H′, and H″ are presented.