Laser induced evaporation from stainless steel surfaces.
Hwang, Zen Wen
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Laser-induced evaporation from a stainless steel surface was the laser-target damage mechanism which was studied. Infrared laser pulses with irradiances higher than 10⁹ W/cm² were produced by a Q-switched neodymium glass laser. Experiments were performed in a vacuum chamber evacuated to about 10⁻⁶ Torr. The mass of evaporated material, area of laserdrilled hole and depth of damaged hole were measured. Results showed that the mass of evaporated material was proportional F½ where F is the laser flux in W/cm². Surface damage phenomena were studied by metallographic methods using an optical microscope and scanning electron microscope (SEM). Evaporated materials were partially collected and analyzed separately with the SEM and Princeton Gamma Tech (PGT) 1000 x-ray analyzer. Results for 40 laser shots on one target showed the deposition of small pellets on the collector. The number of pellets depends on the number of laser shots. After 40 shots a pellet density of 10⁸ particles/cm² with an average particle separation of 10ˉ⁴ cm was observed. The average particle diameter was 3800 Å The PGT analyzer showed that Fe/26 and Cr/24 were the primary elements contained in the pellet ejected from the 304 stainless steel target.
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