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Proceedings Paper

Pulsed Hf Laser Oscillator - Amplifier Experiments
Author(s): Garry L. Schott
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Paper Abstract

Pulsed HF chemical laser oscillator energies were scaled from millijoules to several kilojoules over the period 1970 - 1974, reaching q, 10 J with SFE, and transverse discharges, and using electron-beam initiation and elemental F2 above 1000J. This demonstrated scalability to large energy with acceptable electrical efficiency is only one prerequisite for application of this gas laser in fusion; equally important matters are achievement of focusable, % 1 ns pulses, couplable to light-element targets, all from an affordable system. Exploratory MOPA experiments are reported which address control of HF laser beam focusability and pulse duration, using SF6-based experimental oscillator - amplifier sequences and Pockels' cell switching. Simultaneous multiline lasing with 2.6 < X < 3.1 μm and high specific gain and energy density are particularly important factors encountered with HF, where amplifier pumping and lasing occur in a substantially cw temporal relationship, even in < 100 ns bursts. Time-resolved SF6 - HI oscillator spectra contain 27 simultaneous lines from six vibrational bands. An apertured, SF6 -hydrocarbon pin-discharge oscillator generates % 10 mJ of TEMoo radiation, which is amplified to % 1 J in ti 150 ns by a TEA amplifier and propagated tens of meters. A three-stage system coupling these elements through a % 1 ns electrooptic gate to a > 10 J, e-beam energized amplifier is under development.

Paper Details

Date Published: 10 February 1976
PDF: 9 pages
Proc. SPIE 0061, Optical Methods in Energy Conversion, (10 February 1976); doi: 10.1117/12.954423
Show Author Affiliations
Garry L. Schott, University of California (United States)


Published in SPIE Proceedings Vol. 0061:
Optical Methods in Energy Conversion
M. J. Lubin, Editor(s)

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