Related Experiment Video
Updated: Dec 2, 2025
14:18
Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
Published on: February 28, 2016
11.7K
Spectral behavior of partially pumped weakly scattering random lasers
1Department of Applied Physics, Yale University, New Haven, Connecticut 06520, USA. jonathan.andreasen@unice.fr
Optics Express
|March 4, 2011
Summary
Stochastic noise in random lasers affects emission spectra. Absorption in unpumped regions causes discrete lasing peaks by reducing lasing states, while its absence broadens thresholds.
Area of Science:
- Physics
- Optics
- Laser Technology
Background:
- Random lasers exhibit complex lasing phenomena.
- Understanding emission spectra under partial pumping is crucial.
- Stochastic noise plays a role in simulating these systems.
Purpose of the Study:
- To numerically simulate weakly scattering random lasers with stochastic noise.
- To investigate the emission spectrum behavior under partial pumping.
- To analyze the impact of absorption in unpumped regions on lasing states and thresholds.
Main Methods:
- Numerical simulation incorporating stochastic noise.
- Analysis of one-dimensional random laser systems.
- Examination of emission spectra with varied pumping conditions and absorption.
Main Results:
- Discrete lasing peaks were observed when absorption existed in the unpumped region, attributed to a decreased density of lasing states.
- In the absence of absorption, the density of lasing states did not decrease significantly.
- Broader statistical distribution of linear lasing thresholds was observed without absorption.
Conclusions:
- Absorption in unpumped regions is key to observing discrete lasing peaks in random lasers.
- The density of lasing states is a critical factor influenced by absorption.
- Adjusting pumping rates can facilitate incremental observation of lasing in modes with lower thresholds when absorption is absent.
