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Lasing in a random amplifying medium: spatiotemporal characteristics and nonadiabatic atomic dynamics.
1Department of Physics, University of Toronto, 60 St. George Street, Toronto, Ontario, Canada M5S 1A7.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|November 5, 2004
Summary
We modeled lasing dynamics in photonic paints using optical pulses. Our findings show scatterers narrow laser emission linewidth and pulse duration above a threshold pump intensity.
Area of Science:
- Photonics and Laser Physics
- Condensed Matter Physics
- Nonlinear Optics
Background:
- Photonic paints offer novel applications in light emission.
- Understanding lasing dynamics in these materials is crucial for device optimization.
- Short optical pulses provide a unique excitation method for studying transient phenomena.
Purpose of the Study:
- To investigate the dynamics of lasing in photonic paints.
- To model the influence of scatterers on laser emission properties.
- To analyze the spectral, spatial, and temporal characteristics of emitted laser light.
Main Methods:
- Developed a time-dependent diffusion model for light propagation.
- Incorporated the nonlinear response of active atoms using Einstein rate equations.
- Solved the time-dependent diffusion equation with nonlinear gain and loss.
Main Results:
- The model accurately predicts spectral narrowing and pulse duration reduction by scatterers.
- A specific threshold pump intensity was identified for these effects.
- Threshold pump intensity decreases with increased scatterer density and reduced excitation spot size.
Conclusions:
- The developed model successfully captures lasing dynamics in photonic paints.
- Scatterers play a significant role in enhancing laser emission properties.
- The findings align well with experimental observations, validating the model.