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Laser-diode frequency control by resonant phase-conjugate reflection from an atomic vapor
Optics Letters
|September 25, 2009
Summary
Researchers achieved precise frequency control of an aluminum gallium arsenide (AlGaAs) laser diode using atomic rubidium vapor. This method creates a stable optical frequency standard at 780 nm.
Area of Science:
- Atomic, Molecular, and Optical Physics
- Laser Physics and Technology
Background:
- Precise frequency control of semiconductor lasers is crucial for applications like atomic clocks and spectroscopy.
- AlGaAs laser diodes offer a compact and cost-effective solution but often require external stabilization for high-performance frequency control.
Purpose of the Study:
- To investigate the frequency control of an AlGaAs laser diode using resonant phase-conjugate reflection from atomic rubidium vapor.
- To demonstrate a self-controlled optical frequency standard at 780 nm.
Main Methods:
- Utilizing resonant phase-conjugate reflection from atomic rubidium vapor for feedback.
- Employing an electrical feedback technique to analyze frequency stability.
- Directly using phase-conjugate reflection as resonant optical feedback for laser frequency locking.
Main Results:
- The Allan variance achieved a flicker floor of sigma(y)(2)(tau) = 1.6 x 10(-19) tau(0) for tau > 1s using the electrical feedback technique.
- Successful laser frequency locking was demonstrated by directly using the phase-conjugate reflection as optical feedback.
Conclusions:
- Resonant phase-conjugate reflection from atomic rubidium vapor is an effective method for stabilizing AlGaAs laser diode frequency.
- This technique enables the development of a self-controlled optical frequency standard at 780 nm, paving the way for advanced metrology applications.
