The ν1+ν3 and the ν1+ν2+ν41+ν5−1 Combination Bands of 13C2H2. Linestrengths, Broadening Parameters, and Pressure Shifts

Kusaba, Mitsuhiro; Henningsen, J.

doi:10.1006/jmsp.2001.8426

Cited by 28 publications

(12 citation statements)

References 19 publications

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“…The 15% accuracy of the absolute pressure gauge used in the experiments translates into a final frequency error of ∼0.18 kHz by considering −3 kHz/Pa as a pressure-shift coefficient: this derives from ref. 45, where the dependence of the pressure shift on the rotational number of the upper quantum state is accounted for. The pressure-induced shift of the line centre is responsible for a further uncertainty contribution of 0.25 kHz over each measurement set due to the relatively high leakage of the cavity, equal to about 1.5 Pa/h.…”

Section: Resultsmentioning

confidence: 99%

Comb-locked Lamb-dip spectrometer

Gatti

Gotti

Alessio

et al. 2016

Sci Rep

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Overcoming the Doppler broadening limit is a cornerstone of precision spectroscopy. Nevertheless, the achievement of a Doppler-free regime is severely hampered by the need of high field intensities to saturate absorption transitions and of a high signal-to-noise ratio to detect tiny Lamb-dip features. Here we present a novel comb-assisted spectrometer ensuring over a broad range from 1.5 to 1.63 μm intra-cavity field enhancement up to 1.5 kW/cm2, which is suitable for saturation of transitions with extremely weak electric dipole moments. Referencing to an optical frequency comb allows the spectrometer to operate with kHz-level frequency accuracy, while an extremely tight locking of the probe laser to the enhancement cavity enables a 10−11 cm−1 absorption sensitivity to be reached over 200 s in a purely dc direct-detection-mode at the cavity output. The particularly simple and robust detection and operating scheme, together with the wide tunability available, makes the system suitable to explore thousands of lines of several molecules never observed so far in a Doppler-free regime. As a demonstration, Lamb-dip spectroscopy is performed on the P(15) line of the 01120-00000 band of acetylene, featuring a line-strength below 10−23 cm/mol and an Einstein coefficient of 5 mHz, among the weakest ever observed.

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Section: Resultsmentioning

confidence: 99%

Comb-locked Lamb-dip spectrometer

Gatti

Gotti

Alessio

et al. 2016

Sci Rep

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“…Thus, is the ratio between the intermolecular collision rate and the wall collision rate and is the ratio between the Rabi frequency and the wall collision rate. The intermolecular collision rate for the acetylene P9 line has been measured at high pressure (p * 0:1 kPa) [12,13]: 245 kHz=Pap, where p is the acetylene pressure. We use the same value here, although the collisional broadening coefficient may differ at our lower pressure [14].…”

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confidence: 99%

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confidence: 99%

Saturated Optical Absorption by Slow Molecules in Hollow-Core Photonic Band-Gap Fibers

Hald

Petersen

Henningsen³

2007

Phys. Rev. Lett.

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We report on saturated absorption in a hollow-core photonic band-gap fiber filled with 12C2H2 molecules. We find that slow molecules provide a major contribution to the signal in the limit of low optical power and low pressure where the signal deviates significantly from the usual Lorentzian line shape. In particular, we observe a linewidth reduction of about 3 times as compared to the transit-time limited linewidth.

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“…All the fibers tested are about 3 m. The filling pressure and the length of the fibers have been chosen to limit the filling time (less than 30 min) and the pressure broadening. Therefore, the contribution to the full with half maximum (FWHM) of the transition profile due to the gas pressure is limited to 6 MHz [7], while the calculated absorption of the 13 C 2 H 2 P(16) line for a 3 m fiber at 29 Pa is about 54% [19]. As previously mentioned, the transit-time broadening is the major limiting factor for SAS in HC fibers, because the mode field diameter (MFD) is one order of magnitude smaller than what is typically used in bulk vapour cell systems.…”

Section: Experimental Sas Setupmentioning

confidence: 99%

Optical frequency standard using acetylene-filled hollow-core photonic crystal fibers

Triches¹,

Michieletto²,

Hald³

et al. 2015

Opt. Express

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Abstract:Gas-filled hollow-core photonic crystal fibers are used to stabilize a fiber laser to the 13 C 2 H 2 P(16) (ν 1 + ν 3 ) transition at 1542 nm using saturated absorption. Four hollow-core fibers with different crystal structure are compared in terms of long term lock-point repeatability and fractional frequency instability. The locked fiber laser shows a fractional frequency instability below 4 × 10 −12 for averaging time up to 10 4 s. The lock-point repeatability over more than 1 year is 1.3 × 10 −11 , corresponding to a standard deviation of 2.5 kHz. A complete experimental investigation of the light-matter interaction between the spatial modes excited in the fibers and the frequency of the locked laser is presented. A simple theoretical model that explains the interaction is also developed.

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The ν1+ν3 and the ν1+ν2+ν41+ν5−1 Combination Bands of 13C2H2. Linestrengths, Broadening Parameters, and Pressure Shifts

Cited by 28 publications

References 19 publications

Comb-locked Lamb-dip spectrometer

Comb-locked Lamb-dip spectrometer

Saturated Optical Absorption by Slow Molecules in Hollow-Core Photonic Band-Gap Fibers

Optical frequency standard using acetylene-filled hollow-core photonic crystal fibers

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