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Optics Letters

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

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

Published Sep 1, 1991• 29 citations
Publisher

Abstract

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.

DOI
10.1364/ol.16.001298

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Applied Physics Letters•May 20, 1991•4 citations
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. >
We develop a high-performance ultraviolet (UV) frequency stabilization technique implemented directly on UV diode lasers by combining the dichroic atomic vapor laser lock and the resonant transfer cavity lock. As an example, we demonstrate a stable locking with measured frequency standard deviations of approximately 200 kHz and 300 kHz for 399 nm and 370 nm diode lasers in 20 min. We achieve a long-term frequency drift of no more than 1 MHz for the target 370 nm laser within an hour, which is further verified with fluorescence count rates of a single trapped 171Yb+ ion. We also find strong linear correlations between lock points and environmental factors such as temperature and atmospheric pressure. Our approach provides a simple and stable solution at a relatively low cost, and features flexible control, high feedback bandwidth and minimal power consumption of the target UV laser.