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Yue W.,National Key Laboratory of Solid state Laser | Yue W.,North China Research Institute of Electro Optics | Han Y.,North China Research Institute of Electro Optics | Dongye S.,North China Research Institute of Electro Optics | And 2 more authors.
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2012

Silicon is usually used to make lens for mid-infrared optical system because of its wideband transmission region. But as a substrate, in the case of 0°-22.5° incident angle, it was very difficult to deposit dual-band reflection coatings on Si, especially for the durability of φ300 mm large size lenses. Infrared optics and thin film technology as the background, the characteristics, preparation and testing methods of reflection coatings on large size silicon substrate were reported. Since there were very few materials with good characteristics for infrared region to be chosen, it was much more difficult to obtain a good coating which had both good transmittance and durability. Ytterbium fluoride (YbF 3) was adopted as low-index material at last in consideration of choosing IR coating materials and meeting the spectra requirement. But the severe stresses of YbF 3 would result in chapping if there was not a suitable depositing condition. This problem was solved by utilizing improved techniques such as rate-control, ion beam assisted deposition and feasible deposition temperature. The durability, stability and spectra characteristics were all advanced. Source

Liu G.,National Key Laboratory of Solid state Laser | Tang X.,National Key Laboratory of Solid state Laser | Wang C.,National Key Laboratory of Solid state Laser | Liu L.,National Key Laboratory of Solid state Laser | And 5 more authors.
Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams | Year: 2011

Water cooling micro-channel heat sink for high power laser diode was designed. And designs were simulated with computational fluid dynamics(CFD) and numerical heat transfer(NHT) methods. Influences of the size, number of cooling channels and flow rate of cooling water to temperature level and flow resistance characters of the heat sink were discussed. The performance with a diamond heat spreader was numerical calculated. The results indicate that diamond heat spreader can play an important role on decreasing temperature of the heat sink. Source

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