Effect of H2 Pressure on Pulsed H2 + F2 Laser, Experiment and Theory

Stimulated emission predictions and measurements for an H2 + F2 laser are compared for H2 pressures from threshold to stoichiometric, a range of several orders of magnitude. Slowly flowing, helium-diluted, 50-Torr mixtures are initiated photolytically. Two dilution ratios and two output couplers are...

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Bibliographic Details
Main Authors: Suchard, Steven N, Kerber, Ronald L, Emanuel, George, Whittier, James S
Format: Report
Language:English
Subjects:
CHEMICAL LASERS
CHEMICAL REACTIONS
COMPUTERIZED SIMULATION
FLUORIDES
GAS LASERS
HYDROGEN COMPOUNDS
HYDROGEN FLUORIDE LASERS
Lasers and Masers
MATHEMATICAL MODELS
PERFORMANCE(ENGINEERING)
PRESSURE
REACTION KINETICS
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Summary:Stimulated emission predictions and measurements for an H2 + F2 laser are compared for H2 pressures from threshold to stoichiometric, a range of several orders of magnitude. Slowly flowing, helium-diluted, 50-Torr mixtures are initiated photolytically. Two dilution ratios and two output couplers are considered, and good agreement is found for time to threshold and pulse duration vs H2 pressure. Spiking, relaxation oscillations, and possibly mode beating freatures not modeled, are observable in some pulses; however, predicted intensity vs time generally agrees in pulse shape with laser output. Observed and predicted peak intensities nearly match for low H2 pressure, and the predicted increase of peak intensity with low H2 is followed fairly well.