Absolute frequency measurement of a laser at 1556 nm locked to the 5S1/2−5D5/2 two-photon transition in 87Rb

Bernard, J. E.; Madej, A.A.; Siemsen, K.J.; Marmet, L.; Latrasse, C.; Touahri, D.; Poulin, Michel; Allard, Martin; Têtu, M.

doi:10.1016/s0030-4018(99)00689-6

Cited by 45 publications

(30 citation statements)

References 27 publications

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“…The 778 nm rubidium two-photon transitions have been measured with great precision in both 85Rb [1] and 'Rb [2] isotopes and the frequency of the 8Rb 5Si/2 (F=3) -5Dsa (F=5) transition has been recommended for the definition of the meter in 2002 [3]. These reference transitions can be used to frequency stabilize a 1556 nm laser through second harmonic generation and provide a standard for the optical telecommunication window [4].…”

Section: Lntroductinmentioning

confidence: 99%

Turnkey compact frequency standard at 1556 nm based on Rb two-photon transitions

Cliche¹,

Latrasse²,

Têtu³

et al. 2004

2004 Conference on Precision Electromagnetic Measurements

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DiCOS Technologies has developed a high coherence fully automated absolute frequency standard for metrology applications. It uses a 1556 nm narrow linewidth DFB fiber laser locked to a two -photon transition in rubidium 85 at 778 nm after second harmonic generation in a non-linear waveguide crystal. Its main features and performances are presented in this paper. lntroductinThe 778 nm rubidium two-photon transitions have been measured with great precision in both 85Rb [1] and 'Rb [2] isotopes and the frequency of the 8Rb 5Si/2 (F=3) -5Dsa (F=5) transition has been recommended for the definition of the meter in 2002 [3]. These reference transitions can be used to frequency stabilize a 1556 nm laser through second harmonic generation and provide a standard for the optical telecommunication window [4]. Such an optical frequency standard can be of great interest in high precision interferometry, radioastronomy and calibration metrology. Therefore, DiCOS Technologies has developed a commercial high performance instrument based on the use of the "Rb two -photon transitions. As an example of application, such a laser will be used as an optical synchronization signal in the Atacama Large Millimeter Array (ALMA) telescope to be deployed in Chile by the National Radio Astronomy Observatory. Considering previous work performed at Laval University [4] and the fact that a practical device needs to be automated, a simplified architecture has been designed in order to achieve a simple locking procedure. The availability of high power narrow linewidth DFB lasers and highly efficient non-linear waveguides has allowed the development of a compact frequency standard that is presented here. Descriltion of the systemIn order to get advantage of the narrow linewidth of the two -photon transition in rubidium, a laser with a linewidth in the kHz range is necessary. DFB fiber lasers that are now commercially available can meet these specifications while providing optical powers as high as 100 mW. This characteristic is very interesting because it can be used to generate several mW of 778 nm in a non-linear waveguide and allows a direct observation of the two-photon transitions in rubidium. The architecture we have selected is depicted in figure 1. A high power (100 mW) DFB fiber laser emitting at 1556 nm is used. It can be frequency tuned through its temperature (coarse and slow tuning) and through a piezoelectric actuator stretching the fiber grating (fine and fast tuning). A fiber coupler allows to pick up a fraction of the optical power to provide an unmodulated useful output while the remainder is directed toward a non-linear waveguide. This device produces a frequency-doubled beam of about 5 mW at 778 nm for a fundamental input of about 70 mW. Fig. 1: Architecture of the turnkey frequency standardThis beam is directed to a 85Rb cell heated to 1 10°C in order to achieve a high atom density. A cat's eye is used after the cell to retro-reflect the incident beam. A photo-multiplier, placed on the side of the cell, collects the fluorescen...

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Section: Lntroductinmentioning

confidence: 99%

Turnkey compact frequency standard at 1556 nm based on Rb two-photon transitions

Cliche¹,

Latrasse²,

Têtu³

et al. 2004

2004 Conference on Precision Electromagnetic Measurements

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“…The 5D level in Rb is used in metrology [16,17] because the frequency of the 5S-5D transition is recommended by the International Committee for Weights and Measures (CIPM) for the practical realization of the definition of the meter [18]. Knowledge of the 5D level polarizability is essential for an accurate evaluation of systematic shifts.…”

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confidence: 99%

Measurement of the5D-level polarizability in laser-cooled Rb atoms

et al. 2014

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We report on accurate measurements of the scalar αS and tensor αT polarizabilities of the 5D fine structure levels 5D 3/2 and 5D 5/2 in Rb. The measured values (in atomic units) αS(5D 3/2 ) = 18400(75), αT (5D 3/2 ) = −750(30), αS(5D 5/2 ) = 18600(76) and αT (5D 5/2 ) = −1440(60) show reasonable correspondence to previously published theoretical predictions, but are more accurate. We implemented laser excitation of the 5D level in a laser cooled cloud of optically polarized Rb-87 atoms placed in a constant electric field.

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“…Also, possible shifts may arise from collisions between rubidium atoms and impurities present in the evacuated cell. Although the presence and nature of these impurities is not known accurately, one can evaluate that the presence of argon (with a relative pressure equal to that of rubidium) would shift the frequency by as much as -700 Hz [2].…”

Section: Svstematic Effects Shiftinp the Freauencv Of The "Rbmentioning

confidence: 99%

“…8~ for 100 s [ 11. The absolute frequency of these standards were recently measured to M.5 kHz in collaboration with the Institute for National Measurement Standards at the National Research Council in Ottawa, using a frequency chain relying on a Sr' single ion standard [2]. This allowed to determine the frequency of the 87Rb …”

Section: Introductionmentioning

confidence: 99%

Three-wavelength optical frequency standard based on the two-photon transition in rubidium

Latrasse

Poulin²,

Allard³

et al.

Conference on Precision Electromagnetic Measurements. Conference Digest. CPEM 2000 (Cat. No.00CH37031)

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Absolute frequency measurement of a laser at 1556 nm locked to the 5S1/2−5D5/2 two-photon transition in 87Rb

Cited by 45 publications

References 27 publications

Turnkey compact frequency standard at 1556 nm based on Rb two-photon transitions

Turnkey compact frequency standard at 1556 nm based on Rb two-photon transitions

Measurement of the5D-level polarizability in laser-cooled Rb atoms

Three-wavelength optical frequency standard based on the two-photon transition in rubidium

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