National Physical Laboratory–National Bureau of Standards iodine-stabilized helium–neon laser intercomparison

Layer, Howard P.; Rowley, W. R. C.; Marx, B. R.

doi:10.1364/ol.6.000188

Cited by 27 publications

(3 citation statements)

References 1 publication

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“…Two corrections were applied to the data to arrive at the values in table 3. First, the results were reduced by 1.5 × 10 −6 cm −1 to correct for the actual iodine cell temperature [16] and intracavity power [18] of our iodine-stabilized reference laser. Second, a much larger correction was made to account for the phase change on reflection at the Fabry-Perot interferometer plates.…”

Section: Resultsmentioning

confidence: 99%

Doppler-free measurement of the 546 nm line of mercury

Sansonetti¹,

Veža²

2010

J. Phys. B: At. Mol. Opt. Phys.

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We have made Doppler-free observations of the 546 nm line of neutral mercury by using saturated absorption and frequency modulation spectroscopy. Absolute wave numbers were measured for 14 resolved components arising from six mercury isotopes. Combining these measurements with precisely known isotope shifts and hyperfine-structure splittings, we derive a value for the wave number in 198 Hg from each of the measured features. Our final value for the wave number of the 198 Hg line is in good agreement with a recently reported measurement using Fourier transform spectroscopy but has an uncertainty that is smaller by a factor of 12.

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Section: Resultsmentioning

confidence: 99%

Doppler-free measurement of the 546 nm line of mercury

Sansonetti¹,

Veža²

2010

J. Phys. B: At. Mol. Opt. Phys.

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“…Second, the results were further reduced by 2 parts in 10' (about 0.000006 cm ') to correct for variation in the iodine cell temperature [7] and intracavity power [8] of the reference laser from the recommended values. In the process of searching for other systematic eA'ects we varied the laser polarization from circular to plane and observed no shift in the measured line centers, leading us to conclude that Zeeman shifts under the normal operating conditions of & 98% plane polarized laser light are entirely negligible.…”

Section: R1mentioning

confidence: 99%

Absolute ionization energy of the 21Slevel of helium

Sansonetti

Gillaspy

1992

Phys. Rev. A

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The Rapid Communications section is intended for the accelerated publication of important new results Sin.ce manuscripts submitted to this section are given priority treatment both in the editorial once and in production, authors should explain in their submittal letter why the work justifies this special handling A.Rapid Communication should be no longer than 3/'~printed pages and must be accompanied by an abstract. Page proofs are sent to authors Absolute ionization energy of the 2 'S level of helium %e have measured the absolute wave numbers of a series of transitions from the metastable 2'S level of helium to the n P (n 7-74) excited states. From these data we determine the binding energy of the 2 'S level to 2.2 parts in 10' by using a Ritz series formula. This high-precision determination of the 2 'S binding energy does not depend on theoretical calculation of the binding energy of any helium level. The result, 32033.228855(7) cm ', confirms our earlier finding of a relatively large discrepancy with the predicted two-electron Lamb shift for the 2 'S level.PACS number(s): 35. IO. Hn, 32.30.Jc, 12.20.Fv In a recent paper [I], we reported an experimental determination of the binding energy of the first excited singlet state of helium (2'5) that deviated significantly from the best available QED predictions. This result was subsequently confirmed to higher precision by Lichten, Shiner, and Zhou [2). Although these two experiments observed transitions to difl'erent levels and used difl'erent metrological techniques, both relied upon the calculated energies of selected high-lying levels to tie experimentally measured transition energies to the ionization limit. It is assumed that these high-lying levels, for which QED corrections to the energy are small, can be calculated with very high accuracy. This approach to determining the 2 S binding energy, while reasonable, remains somewhat unsatisfying since it is not entirely independent of theory.Clearly, any error that may exist in the calculated binding energy of the high-lying levels enters directly into the reported value for the 2 'S level.In the present work we exploit the predictable behavior of an unperturbed Rydberg series of levels to determine the 2 'S ionization energy. We assume only the general form of the distribution of energy levels and do not require the results of any precise theoretical calculation. In this paper we will describe this approach, briefly discuss our experiment, and present our result for the 2 'S ionization energy. A more detailed report will be given in 'a subsequent publication.It has long been known on an empirical basis that an unperturbed series of energy levels can be represented by the extended Ritz formula E"=E -R/(nb") where E" is the energy of the level with principal quantum number n, E is the ionization energy, R is the finite-mass Rydberg constant for the species of interest, and 8" is the quantum defect given by S"-A+8/(n 8") '+c/(n a-)'+-This formula has been derived from general quantummechanical considerations by ...

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“…The contribution from line broadening of the iodine-absorption component also cannot be neglected. A larger power shift has been reported when the power variation of the laser is achieved by misalignment of the laser cavity mirrors instead of rotating the iodine cell [10]. To our knowledge, an explicit physical model of the power shift is not yet available.…”

Section: Introductionmentioning

confidence: 92%

Experimental investigation of the power shift of iodine-stabilized He-Ne lasers at 633 nm

Hu¹,

Ikonen²,

Riski³

1996

Metrologia

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A group of six iodine absorption cells has been tested in the cavity of an iodine-stabilized He-Ne laser for the investigation of the power-shift coefficient of the laser. It was found that the experimental method used for the power variation may significantly affect the laser frequency and the power-shift coefficient. The experimentally determined power-shift coefficient of the laser can be different for the different iodine absorption cells while other conditions are not changed. A weak correlation between the power-shift coefficient and the iodine-cell polarization extinction ratio is observed. Careful selection of iodine absorption cells and proper adjustment of the laser power are important to meet the specification of the power-shift coefficient given by the Comité International des Poids et Mesures (CIPM) for a reproducible 127I2-stabilized He-Ne laser.

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National Physical Laboratory–National Bureau of Standards iodine-stabilized helium–neon laser intercomparison

Cited by 27 publications

References 1 publication

Doppler-free measurement of the 546 nm line of mercury

Doppler-free measurement of the 546 nm line of mercury

Absolute ionization energy of the 21Slevel of helium

Experimental investigation of the power shift of iodine-stabilized He-Ne lasers at 633 nm

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