12 September 2002 Nanosecond-pulse high-peak-power circle-focusing laser beam for laser processing
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A method and the device for obtaining a high peak output power laser with the ns-regime pulse are presented. A Q-switched laser with a novel configuration and a special Q-switched method for the resonator energy storage are proposed. We put a piece of glass with a small hole and special parameters into the resonator which is composed of two totally reflective mirrors in order to obtain the coupling output and realize the step alternation of Q value from "1" to "0" in the resonator. The photons emit out ofthe resonator after a transmission back and forth so as that the output laser pulses with a few ns lifetime are obtained. Simultaneously, the output laser distributes with a circle-axisymmetic pattern and demonstrates good space-transmission and focusing characteristics.
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Yangwu Ma, Jianping Li, Di Liang, Xuanhui Lu, "Nanosecond-pulse high-peak-power circle-focusing laser beam for laser processing", Proc. SPIE 4915, Lasers in Material Processing and Manufacturing, (12 September 2002); doi: 10.1117/12.482916; https://doi.org/10.1117/12.482916

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