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Enhanced quantum fluctuations in a chaotic single mode ammonia laser
1School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332.
Chaos (Woodbury, N.Y.)
|March 1, 1994
Summary
Quantum fluctuations in chaotic lasers are amplified by chaos, becoming macroscopically visible. Nonlinear Langevin equations and symbolic dynamics reveal this significant enhancement of quantum noise.
Area of Science:
- Quantum optics
- Laser physics
- Nonlinear dynamics
Background:
- Linear noise approximation is insufficient for chaotic laser dynamics.
- Quantum fluctuations significantly impact laser behavior.
Purpose of the Study:
- To investigate the effect of quantum fluctuations in chaotic single-mode lasers.
- To develop a more accurate model for chaotic laser dynamics.
- To quantify the amplification of quantum noise by chaotic dynamics.
Main Methods:
- Utilizing nonlinear Langevin equations for a more accurate laser description.
- Deriving expressions for the time evolution of electric field and polarization phases.
- Employing numerical simulations to verify theoretical predictions.
- Applying a symbolic dynamics metric to quantify noise amplification.
Main Results:
- Chaotic dynamics greatly enhance phase diffusion.
- Quantum noise amplification by chaos is demonstrated.
- Fluctuations are amplified by over two orders of magnitude, becoming macroscopically visible.
Conclusions:
- Nonlinear Langevin equations provide a more accurate model for chaotic lasers.
- Chaotic dynamics significantly amplify quantum noise, leading to observable effects.
- Symbolic dynamics offers a quantitative method to measure this amplification.