Cavity dumped laser shock peening process

Details Cavity dumped laser shock peening process Cavity dumped laser shock peening process

1995-12-21

1998-03-24

Ip, Sikyin

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148714, 148903, 21912161, C21D 104

Patent

active

057308110

ABSTRACT:
A laser shock peening apparatus includes a cavity dumping laser oscillator including in optical serial alignment a first mirror, a Pockels cell, a polarizer, a laser rod, and a second mirror defining a cavity having an optical length between the mirrors. The laser rod is optically pumped to generate a laser beam in the cavity, and the Pockels cell has selective wave retardation to allow the beam to oscillate between the mirrors and increase energy therein, followed in turn by dumping the beam into a laser amplifier. The laser amplifier directs the amplified pulse at a target for laser shock peening thereof. The cavity length is selected to develop a substantially square-wave laser pulse for temporally shaping the resulting pressure pulse at the target.

REFERENCES:
patent: 3747019 (1973-07-01), Koechner et al.
patent: 5127019 (1992-06-01), Epstein et al.
patent: 5131957 (1992-07-01), Epstein et al.
Koechner, "Solid-State Laser Engineering", 3rd Edition, 1992, pp.: cover, 435-441,476-481.
Fairand et al., "Laser Generation of High-Amplitude Stress Waves in Materials", J. Appl. Phys. vol. 50, No. 3, Mar. 1979, pp.: 1497-1502.
Vaccari, "Laser Shocking Extends Fatigue Life", American Machinist, Jul. 1992, pp.: 62-64.
Fairand et al., "Effect of Water and Paint Coatings on the Magnitude of Laser-Generated Shocks", Optics Communications, vol. 18, No. 4, Sep. 1976, pp.: 588-591.
Clauer et al., "The Effects of Laser Shock Processing on the Fatigue Properties of 2024-T3 Aluminum", Lasers in Materials Processing, Jan. 1983, pp.: cover, 7-22.
Fabbro et al., "Physical Study of Laser-Produced Plasma in Confined Geometry", J. Appl. Phys., vol. 68, No. 2, Jul. 1990, pp.: 775-784.

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