Mr. Osama M. Helal Profile

Osama M. Helal

at Changchun Univ of Science and Technology

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Proceedings Article | 17 September 2013 Paper

Long-pulse laser design and experimental work

Osama Helal, Tan Yong, Ding Yunfeng, HongXing Cai

Proceedings Volume 8904, 890408 (2013) https://doi.org/10.1117/12.2031588

KEYWORDS: Mirrors, Reflectivity, Nd:YAG lasers, Resonators, Solid state lasers, Optical resonators, Laser systems engineering, Lamps, Laser development, Pulsed laser operation

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Long pulse laser starts to have a prominent role in many applications. So, How to design and calculate the parameters of the high power long-pulse solid-state laser is illustrated, experimentally and arithmetically. How to design a pumping chamber is illustrated, with a double-ellipse cavity. Optical resonator losses are got experimentally in details. Efficiency factor and system slope efficiency are calculated experimentally. Illustration for how to get the optimum mirror reflectivity is mentioned. Beam waist and beam divergence also studied experimentally. The designed system has 10J output energy with pulse width 20msec for efficiency factor 1.1% and a combined loss 0.181 inside resonator. Average system efficiency, gain coefficient and fluorescence power for four different output mirror reflectivity are 0.328%, 0.00994cm^-1 and 144.92W respectively. 6KW/cm² power density inside resonator is obtained which corresponds to 585W maximum output power. An optimum mirror reflectivity 57% is for 208.2KW input power. The beam waist and beam divergence are recorded to be 0.66cm and 8.86mrad. Calculations show that, 11.7J output energy can be obtained by more optimization based on the designed system.

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