Short laser pulse generation by gas breakdown switching and high

Details Short laser pulse generation by gas breakdown switching and high Short laser pulse generation by gas breakdown switching and high

1974-07-03

1976-09-07

Sikes, William L.

Oscillators

Molecular or particle resonant type

H01S 3101

Patent

active

039796949

ABSTRACT:
In a laser pulse generator, short pulses adjustable in the range between about 0.1 and 0.5 nanoseconds are produced by improved spectral filtering of the output of a gas breakdown switch. The spectral filter in one embodiment is a hot, linearly absorbing gas cell that passes both sidebands of the radiation producing the gas breakdown in the switch and that linearly absorbs the center frequency. A second embodiment uses a tandem dual-slit monochromator as the spectral filter in order to pass both sidebands. The hot gas cell is simpler, cheaper and characterized by a higher rejection ratio than any other alternative to date. It yields very clean pulses with a steeper leading edge than prior techniques. The leading edge is highly reproducible, as needed for nuclear fusion work. The advantage over prior pulsed CO.sub.2 lasers for nuclear fusion work is substantial, since those prior lasers have not achieved pulse durations less than one nanosecond.

REFERENCES:
yablonovitch, Similarity Principles for Laser-Induced Breakdown in Gases, Appl. Phys. Lett., vol. 23, No. 3 (Aug. 1, 1973) pp. 121-122.
Milam et al., Production of Intense Subnanosecond Pulses by Cavity Dumping, IEEE J. Quant. Elect., QE-10, No. 1 (Jan. 1974) pp. 20-25.

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