Related Experiment Video
Updated: Jun 17, 2026
13:31
High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
Published on: December 22, 2015
Intracavity brillouin scattering from passive Q-spoiling cells
1Air Force Weapons Laboratory,Kirtland Air Force Base, Albuquerque, New Mexico 87117, USA.
Applied Optics
|January 12, 2010
Summary
Stimulated Brillouin scattering in ruby laser cavities using methanol solvent was observed. Shorter cell lengths effectively eliminated Brillouin radiation, even at high output powers.
Area of Science:
- Nonlinear optics
- Laser physics
Background:
- Stimulated Brillouin scattering (SBS) is a nonlinear optical process.
- SBS can occur in laser cavities, affecting laser performance.
- Methanol and cryptocyanine dye are used in ruby laser systems.
Purpose of the Study:
- To investigate Stimulated Brillouin scattering in a ruby laser cavity.
- To compare SBS frequency shifts within and outside the laser cavity.
- To determine the effect of cell length on SBS elimination.
Main Methods:
- Utilized a ruby laser cavity containing methanol solvent and cryptocyanine dye.
- Observed stimulated Brillouin scattering at low megawatt output powers.
- Compared frequency shifts from SBS within the cavity to those in an external methanol cell.
- Experimented with different cell lengths (3-mm vs. 25.4-mm) to eliminate SBS.
Main Results:
- Stimulated Brillouin scattering was observed in the methanol solvent within the ruby laser cavity.
- Frequency shifts from SBS within the cavity were slightly smaller than in an external methanol cell.
- Using a 3-mm cell length eliminated Brillouin radiation, even at output powers exceeding 250 MW, compared to a 25.4-mm cell.
Conclusions:
- Stimulated Brillouin scattering is a significant factor in ruby laser cavities with methanol.
- Cavity-induced SBS frequency shifts differ slightly from external cell measurements.
- Shorter optical cell lengths are effective in suppressing unwanted Brillouin radiation in high-power lasers.
