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Proceedings Paper

Modeling of pumping kinetics of an iodine photodissociation laser with long pumping pulse
Author(s): Karel Rohlena; Jaroslav Beranek; Karel Masek
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Paper Abstract

In an iodine photodissociation laser the inversion population build-up (excited iodine atoms in the 52P1/2 state) is due to photodissociation of a suitable alkyliodide (usually C3F7I) by UV light from surrounding Xe flashlamps or an open discharge. Most existing systems utilize a short (10 microsecond(s) ) pumping pulse to prevent an inwardly propagating shock wave from destroying the inversion and to quench the excited iodine minimizing the adverse effect of secondary chemical processes. This advantage is at a cost of technical inconvenience such as a high discharge voltage or a need to exchange the Xe filling of the flashlamps after a certain number of shots. An alternative way is to use a long (300 microsecond(s) ) pumping pulse from sealed lamps. The pulse is then 'soft enough' so as not to release the lethal shock wave from the wall of the laser vesel, but the pumping kinetics is fairly complex as many more chemical reactions are allowed to participate in the inversion build-up. A detailed investigation of the kinetics is the subject of this paper. Three different sets of kinetic constants were used and tested against experimental results. For that purpose the third amplifier of the system PERUN at Institute of Physics in Prague was converted to an oscillator and the measured output power was compared with the theory for some typical compositions of laser mixture. Apart from a direct assessment of the kinetic constants used in the calculations the results point out that a pyrolysis must be included with a secondary photolysis of iodine molecules by visible light. This work is designed as an end-to-end enrgy modeling of the system PERUN.

Paper Details

Date Published: 1 May 1991
PDF: 10 pages
Proc. SPIE 1415, Modeling and Simulation of Laser Systems II, (1 May 1991); doi: 10.1117/12.43691
Show Author Affiliations
Karel Rohlena, Institute of Physics (Czech Republic)
Jaroslav Beranek, Institute of Physics (Czech Republic)
Karel Masek, Institute of Physics (Czech Republic)


Published in SPIE Proceedings Vol. 1415:
Modeling and Simulation of Laser Systems II
Alvin D. Schnurr, Editor(s)

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