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Published on: May 30, 2014
Semilinear coherent optical oscillator with frequency shifted feedback
Optics Express
|June 25, 2009
Summary
Saw-tooth variation of cavity length in photorefractive oscillators suppresses frequency instability and prevents spectrum bifurcation. Optimal modulation frequency depends on crystal properties and experimental conditions for stable oscillation.
Area of Science:
- Nonlinear Optics
- Laser Physics
- Photorefractive Materials
Background:
- Photorefractive oscillators are susceptible to frequency instabilities and spectral bifurcations.
- Controlling oscillation spectra is crucial for applications requiring stable laser output.
Purpose of the Study:
- To investigate the effect of saw-tooth cavity length variation on the stability of a photorefractive semilinear coherent oscillator.
- To determine the conditions under which this modulation can suppress frequency domain instabilities and prevent spectral bifurcation.
Main Methods:
- Theoretical analysis of a photorefractive semilinear coherent oscillator model.
- Numerical simulations exploring the parameter space for cavity length modulation.
- Investigation of the influence of photorefractive crystal properties and experimental parameters.
Main Results:
- Saw-tooth cavity length modulation effectively suppresses frequency instabilities.
- Appropriate modulation frequency selection is key to preventing oscillation spectrum bifurcation.
- Crystal parameters, experimental conditions, and pump wave alignment significantly influence suppression effectiveness.
- Mirror vibration can induce further frequency splitting under specific conditions.
Conclusions:
- Saw-tooth cavity length modulation offers a viable method for stabilizing photorefractive oscillators.
- Careful control of modulation frequency and experimental parameters is essential for achieving stable, single-mode oscillation.
- Understanding parameter dependencies is critical for designing robust photorefractive laser systems.
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