CO/sub 2/ laser stabilization to 0.1-Hz level using external electrooptic modulation

Bernard, Vladan; Daussy, Christophe; Nogues, Gilles; Constantin, L. F.; Durand, Pierre-Emmanuel; Amy‐Klein, Anne; Lerberghe, A. Van; Chardonnet, Ch.

doi:10.1109/3.605548

Cited by 61 publications

(76 citation statements)

References 16 publications

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“…The laser source is based on a CO 2 laser stabilized on an absorption line of OsO 4 . The laser frequency control is a key point of the experiment: the spectral purity is better than 10 Hz and the Allan Variance @ 100 Hz can reach 0.1 Hz [9]. Recently, we have measured the absolute frequency of our laser source against the Cs fountain of SYRTE (Paris Observatory) through an optical fibre link connecting our two laboratories.…”

Section: Methodsmentioning

confidence: 99%

Direct Determination of the Boltzmann Constant by an Optical Method

et al. 2007

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We have recorded the Doppler profile of a well-isolated rovibrational line in the ν 2 band of 14 NH 3 . Ammonia gas was placed in an absorption cell thermalized by a water-ice bath. By extrapolating to zero pressure, we have deduced the Doppler width which gives a first measurement of the Boltzmann constant, k B , by laser spectroscopy. A relative uncertainty of 2×10 -4 has been obtained. The present determination should be significantly improved in the near future and contribute to a new definition of the kelvin.

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Section: Methodsmentioning

confidence: 99%

Direct Determination of the Boltzmann Constant by an Optical Method

et al. 2007

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“…The laser spectral width measured from the Allan deviation of the beat note between two independent lasers shows a typical frequency instability below 1 Hz after 100 s. 54 For data collection and averaging (see section C), frequency stability is however also required over longer times of a few tens of minutes, after which the typical frequency instability is ~100 Hz. 54 This system can achieve a frequency accuracy better than 100 Hz. 54 The second laser, whose beam is used to probe MTO, is phase locked to the first with a tunable radio frequency (RF) offset.…”

Section: A the Spectrometermentioning

confidence: 99%

“…The frequency stabilization scheme is described in 54 : a sideband generated with a tunable electro-optic modulator (EOM) is stabilized on an OsO 4 saturated absorption line (FWHM ~20 kHz) detected in transmission of a 1.6-m long Fabry-Perot cavity. The laser spectral width measured from the Allan deviation of the beat note between two independent lasers shows a typical frequency instability below 1 Hz after 100 s. 54 For data collection and averaging (see section C), frequency stability is however also required over longer times of a few tens of minutes, after which the typical frequency instability is ~100 Hz. 54 This system can achieve a frequency accuracy better than 100 Hz.…”

Section: A the Spectrometermentioning

confidence: 99%

High resolution spectroscopy of methyltrioxorhenium: towards the observation of parity violation in chiral molecules

Stoeffler

Darquié

Shelkovnikov

et al. 2011

Phys. Chem. Chem. Phys.

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Originating from the weak interaction, parity violation in chiral molecules has been considered as a possible origin of the biohomochirality. It was predicted in 1974 but has never been observed so far. Parity violation should lead to a very tiny frequency difference in the rovibrational spectra of the enantiomers of a chiral molecule. We have proposed to observe this predicted frequency difference using the two photon Ramsey fringes technique on a supersonic beam. Promising candidates for this experiment are chiral oxorhenium complexes, which present a large effect, can be synthesized in large quantity and enantiopure form, and can be seeded in a molecular beam. As a first step towards our objective, a detailed spectroscopic study of methyltrioxorhenium (MTO) has been undertaken. It is an ideal test molecule as the achiral parent molecule of chiral candidates for the parity violation experiment. For the 187 Re MTO isotopologue, a combined analysis of Fourier transform microwave and infrared spectra as well as ultra-high resolution CO 2 laser absorption spectra enabled the assignment of 28 rotational lines and 71 rovibrational lines, some of them with a resolved hyperfine structure. A set of spectroscopic parameters in the ground and first excited state, including hyperfine structure constants, was obtained for the ν as antisymmetric Re=O stretching mode of this molecule. This result validates the experimental approach to be followed once a chiral derivative of MTO will be synthesized, and shows the benefit of the combination of several spectroscopic techniques in different spectral regions, with different set-ups and resolutions. First high resolution spectra of jet-cooled MTO, obtained on the setup being developed for the observation of molecular parity violation, are shown, which constitutes a major step towards the targeted objective. † Supplementary information available in the ancillary file: Measured and fitted transition frequencies as well as spectroscopic constants.1

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“…It contains a CO 2 laser stabilized on a saturated absorption line of osmium tetroxyde. Thanks to the resulting unique spectral properties (below 10 Hz width, 0.1 Hz frequency instability for 100 s integration time [33]), an incomparable control of the frequency scale is reached, a crucial element for a careful reproduction of the lineshape. The intensity of the laser beam is stabilized before being sent to the absorption cell filled with gaseous ammonia.…”

Section: The Experimental Setupmentioning

confidence: 99%

Accurate determination of the Boltzmann constant by Doppler spectroscopy: Towards a new definition of the kelvin

Darquié

Mejri

Sow

et al. 2013

EPJ Web of Conferences

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Abstract. Accurate molecular spectroscopy in the mid-infrared region allows precision measurements of fundamental constants. For instance, measuring the linewidth of an isolated Doppler-broadened absorption line of ammonia around 10 m enables a determination of the Boltzmann constant k B . We report on our latest measurements. By fitting this lineshape to several models which include Dicke narrowing or speeddependent collisional effects, we find that a determination of k B with an uncertainty of a few ppm is reachable. This is comparable to the best current uncertainty obtained using acoustic methods and would make a significant contribution to any new value of k B determined by the CODATA. Furthermore, having multiple independent measurements at these accuracies opens the possibility of defining the kelvin by fixing k B , an exciting prospect considering the upcoming redefinition of the International System of Units.

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CO/sub 2/ laser stabilization to 0.1-Hz level using external electrooptic modulation

Cited by 61 publications

References 16 publications

Direct Determination of the Boltzmann Constant by an Optical Method

Direct Determination of the Boltzmann Constant by an Optical Method

High resolution spectroscopy of methyltrioxorhenium: towards the observation of parity violation in chiral molecules

Accurate determination of the Boltzmann constant by Doppler spectroscopy: Towards a new definition of the kelvin

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