Frequency stability of an optical frequency standard at 192.6 THz based on a two-photon transition of rubidium atoms

Poulin, Michel; Latrasse, C.; Touahri, D.; Têtu, M.

doi:10.1016/s0030-4018(02)01354-8

Cited by 37 publications

(28 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4(b), the increase in two-photon spectral linewidth observed here is not induced by the intermediate state. Rather, it is the effect of inhomogeneous ac Stark shifts experienced by the atoms in different regions of the fiber's optical mode [9].…”

Section: Two-photon Characteristicsmentioning

confidence: 99%

See 1 more Smart Citation

High-resolution two-photon spectroscopy of rubidium within a confined geometry

et al. 2013

View full text Add to dashboard Cite

We present two-photon spectroscopy of a thermal rubidium vapor confined to the hollow core of a photoniccrystal fiber. Linewidths as narrow as 10 MHz were observed on the 5S 1/2 → 5D 5/2 transition enabling the hyperfine splitting of the excited state to be resolved. Very strong nonlinear absorption (>90%) was observed, with substantial absorption maintained over large detunings (9 GHz) from an intermediate state. These attributes make this system ideal for many frequency metrology and quantum optics applications.

show abstract

Section: Two-photon Characteristicsmentioning

confidence: 99%

“…Such transitions also offer narrow linewidths beneficial for frequency metrology applications such as atomic clocks and frequency stabilization [8,9]. For these applications, nonlinear transitions are most useful when they deliver strong absorption at low optical powers.…”

Section: Introductionmentioning

confidence: 99%

High-resolution two-photon spectroscopy of rubidium within a confined geometry

et al. 2013

View full text Add to dashboard Cite

show abstract

“…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.…”

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

View full text Add to dashboard Cite

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...

show abstract

“…These transitions have found applications in alloptical switches [11,17,18], single-photon generation [19], and photon coherence measurements and quantum logic gates [20,21]. Furthermore, multiphoton transitions can excite into long-lived atomic states with their inherently narrow linewidths: these have been beneficial for frequency metrology applications such as atomic clocks and frequency stabilization [22,23].…”

Section: Introductionmentioning

confidence: 99%

Anomalous two-photon spectral features in warm rubidium vapor

et al. 2016

View full text Add to dashboard Cite

We report observation of anomalous fluorescence spectral features in the environs of a two-photon transition in a rubidium vapor when excited with two different wavelength lasers that are both counterpropagating through the vapor. These features are characterized by an unusual trade-off between the detunings of the driving fields. Three different hypothetical processes are presented to explain the observed spectra: a simultaneous three-atom and four-photon collision, a four-photon excitation involving a light field produced via amplified spontaneous emission, and population pumping perturbing the expected steady-state spectra. Numerical modeling of each hypothetical process is presented, supporting the population pumping process as the most plausible mechanism.

show abstract

Frequency stability of an optical frequency standard at 192.6 THz based on a two-photon transition of rubidium atoms

Cited by 37 publications

References 27 publications

High-resolution two-photon spectroscopy of rubidium within a confined geometry

High-resolution two-photon spectroscopy of rubidium within a confined geometry

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

Anomalous two-photon spectral features in warm rubidium vapor

Contact Info

Product

Resources

About