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Optical frequency reference at 780 nm from phase conjugate reflection in rubidium vapor

Normand Cyr, M. Têtu, Marc Breton, Sylvain Thériault

Published May 21, 1990• 1 citation
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Abstract

Narrow isolated symmetrical resonance lines are essential to the realization of precise frequency standards. We consider here the use of resonant degenerate four-wave mixing phase conjugate reflection from an atomic vapor as an optical reference for this purpose.1 As shown, this technique leads to a well defined narrow linewidth resonance when applied to a rubidium vapor pumped by a laser diode.

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Laser-diode frequency control by resonant phase-conjugate reflection from an atomic vapor

Normand Cyr, Marc Breton, M. Têtu +1 more

We report our first results on the frequency control of an AlGaAs laser diode by resonant phase-conjugate reflection from an atomic rubidium vapor. When the electrical feedback technique is used, the Allan variance reaches a flicker floor such that sigma(y)(2)(tau) = 1.6 x 10(-19) tau(0) for tau > 1s. We also demonstrate that laser frequency locking can be achieved by using the phase-conjugate reflection directly as a resonant optical feedback. This approach leads to a self-controlled optical frequency standard at 780 nm.

Optics Letters•Sep 1, 1991•29 citations

Toward the realization of a wavelength standard at 780 nm based on a laser diode frequency-locked to rubidium vapor

M. Têtu, Normand Cyr, Bernard Villeneuve +3 more

The authors present the result of a study on the realization of an optical frequency standard based on a laser diode frequency-locked to Doppler resonance limited and sub-Doppler resonances of the /sup 87/Rb D/sub 2/-line (5S/sub 1/2/ from or to 5P/sub 3/2/, 780.027 nm). The characteristics of the signals obtained from the resonant phase-conjugate reflection, the nonlinear magnetic optical activity, and the saturated absorption are compared to the characteristics of the linear absorption signal. Improvement of laser diode frequency stability is discussed for these techniques. The experimental results indicate that the more complicated the system, the better defined is the reference line.>

Conference on Precision Electromagnetic Measurements•Dec 4, 2002•0 citations

Toward the realization of a wavelength standard at 780 nm based on a laser diode frequency locked to rubidium vapor

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We study Doppler limited and Sub-Doppler spectre scopic techniques to generate optical references from the D2-line (780 nm) of rubidium vapor. The characteristics of the signals obtained from the resonant phase conjugate reflection, the nonlinear magnetic optical activity and the saturated absorption are compared to the linear absorption signal. Improvement of laser diode frequency stability is discussed for these techniques.

•Jan 1, 1990•0 citations

Observation of amplified reflection by degenerate four-wave mixing in atomic sodium vapor

D. M. Bloom, P. F. Liao, Nicholas P. Economou

This Letter is the first report of the observation of amplified reflection and self-oscillation produced by degenerate optical four-wave mixing by using a resonantly enhanced Kerr nonlinearity in atomic sodium vapor. Phase-conjugated reflected waves with intensities 100 times greater than input-signal intensities were achieved with only 40-kW/cm2 pump intensity.

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Saturation in Degenerate Four-Wave Mixing

G. Grynberg, M. Pinard, Philippe Verkerk

In atomic vapors, the variation of the phase-conjugate reflectivity versus frequency has been a subject of interest these recent years. At low incident intensity for the pump and probe waves, a Lorentzian curve centered at the atomic resonance frequency is observed. At high pump intensity a splitting is observed, and the phase-conjugate reflectivity tends toward zero at the atomic resonance frequency.1 A correct treatment for this complex situation has been derived recently by Bloch and Ducloy.2 However, their theory leads to intricate calculations for which it is difficult to find physical interpretations. A great simplification is obtained by using the dressed-atom approach. The calculations are easier to derive and lead to clear physical interpretations. New results are predicted, some of them have already been observed experimentally.

Journal of the Optical Society of America B•Jan 1, 1984•0 citations
Narrow isolated symmetrical resonance lines are essential to the realization of precise frequency standards. We consider here the use of resonant degenerate four-wave mixing phase conjugate reflection from an atomic vapor as an optical reference for this purpose.1 As shown, this technique leads to a well defined narrow linewidth resonance when applied to a rubidium vapor pumped by a laser diode.
We report our first results on the frequency control of an AlGaAs laser diode by resonant phase-conjugate reflection from an atomic rubidium vapor. When the electrical feedback technique is used, the Allan variance reaches a flicker floor such that sigma(y)(2)(tau) = 1.6 x 10(-19) tau(0) for tau > 1s. We also demonstrate that laser frequency locking can be achieved by using the phase-conjugate reflection directly as a resonant optical feedback. This approach leads to a self-controlled optical frequency standard at 780 nm.
The authors present the result of a study on the realization of an optical frequency standard based on a laser diode frequency-locked to Doppler resonance limited and sub-Doppler resonances of the /sup 87/Rb D/sub 2/-line (5S/sub 1/2/ from or to 5P/sub 3/2/, 780.027 nm). The characteristics of the signals obtained from the resonant phase-conjugate reflection, the nonlinear magnetic optical activity, and the saturated absorption are compared to the characteristics of the linear absorption signal. Improvement of laser diode frequency stability is discussed for these techniques. The experimental results indicate that the more complicated the system, the better defined is the reference line.>
The authors present the result of a study on the realization of an optical frequency standard based on a laser diode frequency-locked to Doppler resonance limited and sub-Doppler resonances of the /sup 87/Rb D/sub 2/-line (5S/sub 1/2/ from or to 5P/sub 3/2/, 780.027 nm). The characteristics of the signals obtained from the resonant phase-conjugate reflection, the nonlinear magnetic optical activity, and the saturated absorption are compared to the characteristics of the linear absorption signal. Improvement of laser diode frequency stability is discussed for these techniques. The experimental results indicate that the more complicated the system, the better defined is the reference line. >
In atomic vapors, the variation of the phase-conjugate reflectivity versus frequency has been a subject of interest these recent years. At low incident intensity for the pump and probe waves, a Lorentzian curve centered at the atomic resonance frequency is observed. At high pump intensity a splitting is observed, and the phase-conjugate reflectivity tends toward zero at the atomic resonance frequency.1 A correct treatment for this complex situation has been derived recently by Bloch and Ducloy.2 However, their theory leads to intricate calculations for which it is difficult to find physical interpretations. A great simplification is obtained by using the dressed-atom approach. The calculations are easier to derive and lead to clear physical interpretations. New results are predicted, some of them have already been observed experimentally.