Q-switched Nd:YAG laser engraving

Hong Gao; Gengxing Luo; Ke Yu; Guang-Nan Chen

doi:10.1117/12.307143

30 April 1998 Q-switched Nd:YAG laser engraving

Hong Gao, Gengxing Luo, Ke Yu, Guang-Nan Chen

Proceedings Volume 3272, Laser Techniques for Surface Science III; (1998) https://doi.org/10.1117/12.307143
Event: Optoelectronics and High-Power Lasers and Applications, 1998, San Jose, CA, United States

Abstract

IN this paper, the engraving process with Q-Switched Nd:YAG laser is investigated. High power density is the pre- requisition to vapor materials, and high repetition rate makes the engraving process highly efficient. An acousto- optic Q-Switch is applied in the cavity of CW 200 W Nd:YAG laser to achieve the high peak power density and the high pulse repetition rate. Different shape craters are formed in a patterned structure on the material surface when the laser beam irradiates on it by controlling power density, pulse repetition rate, pulse quantity and pulse interval. In addition, assisting oxygen gas is used for not only improving combustion to deepen the craters but also removing the plasma that generated on the top of craters. Off-focus length classified as negative and positive has a substantial effect on crater diameters. According to the message of rotating angle positions from material to be engraved and the information of graph pixels from computer, a special graph is imparted to the material by integrating the Q- Switched Nd:YAG laser with the computer graph manipulation and the numerically controlled worktable. The crater diameter depends on laser beam divergence and laser focal length. The crater diameter changes from 50 micrometers to 300 micrometers , and the maximum of crater depth reaches one millimeter.

Citation Download Citation

Hong Gao, Gengxing Luo, Ke Yu, and Guang-Nan Chen "Q-switched Nd:YAG laser engraving", Proc. SPIE 3272, Laser Techniques for Surface Science III, (30 April 1998); https://doi.org/10.1117/12.307143

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KEYWORDS

Laser engraving

Nd:YAG lasers

Q switched lasers

Pulsed laser operation

Oxygen

Q switching

Laser irradiation

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