Dr. Ming Ling Profile

Dr. Ming Ling

at Changchun Univ of Science and Technology

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Proceedings Article | 29 August 2009 Paper

LD side-pumped Nd:YAG Q-switched laser without water cooling

Ming Ling, Guang-yong Jin, Xue-chun Tan, Zhi-chao Wu, Zhu Liang

Proceedings Volume 7382, 73821F (2009) https://doi.org/10.1117/12.834586

KEYWORDS: Laser crystals, Semiconductor lasers, Nd:YAG lasers, Q switched lasers, Crystals, Laser resonators, Laser applications, Absorption, Resonators, Laser development

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A novel LD side-pumped Nd:YAG Q-switched solid-state laser, which made use of the special pumping strcture with conductive cooling instead of water cooling, was investigated.After selecting an appropriate length and diameter of Nd:YAG laser crystal rod and using three groups of laser diode centimeter bar which was composed by 12 laser diodes and uniformly arranged according to the angle of 120°,side-pumping structure of laser was accomplished.Adopting plano-concave resonator ,mending double end face of laser crystal and designing heat-stability resonator made the resonator steadily oscillate.Laser crystal rod which was tight fastened by copper net was conductively cooled and radiation block was furnished on the external of copper net for increasing the radiation capacity.High reflection gold film was plated on the cooling wall in the opposite way of pumping light, so that the laser crystal was uniformly pumped and the laser with low order mode output.Making the use of pillar lens focus and ray trace computing, reasonable parameters were caculated to couple pumping light to laser with high-efficiency.It was the electrooptic Q-switched which was made to be micro-integration eliminating voltage by KD*P crystal that improved the ratio between acting and unacting.Inner heat radiated from laser in good time with TE cooler and the laser ran at constant temperature with water cooling when the big external heat sink emanated a steady heat to periphery. Experiments revealed that the syetem pumping efficiency riseed by 18% and the laser threshold energy was 192 mJ under the condition of this novel pumping structure. The low mode output of 10～12ns pulse width and the maximum output energy of 98 mJ was achieved with an incident pump energy of 720 mJ in 1064nm.The optical-to-optical conversion efficiency was up to 13. 6 %,and the power instability in 24 h was better than ±1. 7 %.

Proceedings Article | 22 May 2009 Paper

End-pumped Nd:YAG Q-switched laser with high energy and narrow pulse for glass carving

Ming Ling, Guang-yong Jin, Xue-chun Tan, Zhi-chao Wu, Zhu Liang

Proceedings Volume 7282, 72822A (2009) https://doi.org/10.1117/12.830908

KEYWORDS: Nd:YAG lasers, Glasses, Q switched lasers, Semiconductor lasers, Refractive index, Solid state lasers, Laser crystals, Carbon dioxide lasers, Laser applications, Pulsed laser operation

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In order to raise the accuracy of glass carving and improve deep cutting, a novel diode end-pumed solid-state laser is researched. Selecting proper volume of laser crytal, one continue wave laser diode which longitudinally pumped Nd:YAG crystal is performed and an applied optics coupling system is designed with self focusing.Computing with ray trace software and MATLAB software, the best parameter is obtained, so pumping beam is coupled efficiently to Nd:YAG.Used a Cr⁴⁺:YAG crystal with the singnal transmission of 82% and a line plane-concave cavity, nanosecond narrow pulse is gotten. After two thermal-electrical coolers kept the laser to work at constant temperature instead of water cooling, the volume of laser is markedly reduced. The method of thermal-electrical cooling could increase the system efficiency,achieve the effect of low mode output.Experimental results indicate that the maximum laser output energy in 1064 nm is 118mJ,pulse width is 5 ns, conversion efficiency from light to light is 15.7% under the condition of the incident power of 5 W and the diameter of the output laser spot is less than 1 mm. This end-pumped Nd:YAG Q-switched laser with the light output of high quality and long life, which has 0.01 mm accuracy after lens focusing can satisfy the glass carving with higher precision, rapid speed as well as easy control. It can be used in carving all kinds of glass and replace current CO₂ laser.

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