System for obtaining smooth laser beams where intensity variatio

Details System for obtaining smooth laser beams where intensity variatio System for obtaining smooth laser beams where intensity variatio

1990-07-24

1991-09-10

Davie, James W.

Coherent light generators

Particular beam control device

Modulation

372 31, 372102, 372106, H01S 313

Patent

active

050480294

ABSTRACT:
In an SSD (smoothing by spectral dispersion) system which reduces the time-averaged spatial variations in intensity of the laser light to provide uniform illumination of a laser fusion target, an electro-optic phase modulator through which a laser beam passes produces a broadband output beam by imposing a frequency modulated bandwidth on the laser beam. A grating provides spatial and angular spectral dispersion of the beam. Due to the phase modulation, the frequencies ("colors") cycle across the beam. The dispersed beam may be amplified and frequency converted (e.g., tripled) in a plurality of beam lines. A distributed phase plate (DPP) in each line is irradiated by the spectrally dispersed beam and the beam is focused on the target where a smooth (uniform intensity) pattern is produced. The color cycling enhances smoothing and the use of a frequency modulated laser pulse prevents the formation of high intensity spikes which could damage the laser medium in the power amplifiers.

REFERENCES:
patent: 4961195 (1990-10-01), Skupsky et al.
R. S. Craxton, S. Skupsky, J. M. Soures, CLE Review, vol. 36, pp. 158-172, Jul.-Sept. 1988.
J. Buakenberg et al., IEEE J. Quant. Elect., QE-17 9, 1620 (1628), Sep. 1981.

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