Light source responsible for the deterioration of cryptocyanine q-switches
Applied Optics
|February 2, 2010
Summary
Flashlamp ultraviolet radiation causes irreversible bleaching of cryptocyanine solutions used in ruby lasers. The laser beam itself does not significantly damage the cryptocyanine passive shutters.
Area of Science:
- Photochemistry
- Laser Physics
- Materials Science
Background:
- Cryptocyanine solutions are used as passive shutters (Q-switches) in high-peak-power ruby lasers.
- These solutions undergo photochemical decomposition, affecting laser performance.
Purpose of the Study:
- To identify the primary cause of photochemical decomposition in cryptocyanine solutions used in ruby lasers.
- To determine the effect of the laser beam itself on cryptocyanine.
Main Methods:
- Irradiation of methanolic cryptocyanine solutions with ultraviolet radiation from flashlamps.
- Irradiation of methanolic cryptocyanine solutions with the ruby laser beam.
- Observation and quantification of photochemical decomposition (irreversible bleaching).
Main Results:
- Ultraviolet radiation near 300 nm from flashlamps is responsible for almost all photochemical decomposition of cryptocyanine.
- The ruby laser beam itself has minimal to no irreversible effect on cryptocyanine.
Conclusions:
- The flashlamp's ultraviolet output, not the laser beam, causes degradation of cryptocyanine passive shutters.
- Understanding this degradation mechanism is crucial for optimizing ruby laser longevity and performance.
