Analysis of Dye Degradation Effects on Output Energy of the Pulsed Organic Dye Laser
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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The dominant excitation and relaxation mechanisms found in dye molecules are discussed and then incorporated into a model for the xanthene dye laser. Rate equations for this model are presented which include terms that account for excited state singlet absorption and triplet absorption. The system of rate equations are solved using the steady-rate approximation to derive equations for the threshold pump power and output power of the laser. The output power and threshold pump power equations are modified to include variables that allow the following effects of dye degradation to be examined dye concentration reduction, reaction product absorption of pump radiation, reaction product absorption of lasing radiation, and singlet quenching by the reaction products. Theoretical values based on available experimental data are derived for these variables. A computer program is used to integrate the output power of the laser over the duration of a flashlamp pulse to compute the pulse energy. The energy decay curves computed using the theoretical data are presented and compared to the experimental pulse energy decay.
- Lasers and Masers
- Atomic and Molecular Physics and Spectroscopy