Dr. Zhi-Chao Wu Profile

Dr. Zhi-Chao Wu

at Changchun Univ of Science and Technology

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Publications (2)

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Proceedings Article | 29 August 2009 Paper

Design of Er:YAG laser blood-sampling device

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

Proceedings Volume 7382, 73822K (2009) https://doi.org/10.1117/12.835703

KEYWORDS: Er:YAG lasers, Mirrors, Blood, Semiconductor lasers, Laser applications, Laser development, Laser stabilization, Tissues, Tissue optics, Laser optics

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Laser blood-sampling device is one of the foremost tasks in medicine domain. It has a lot of merits such as un-touching, avoiding infection, indolence, and fast healing etc. The Er:YAG laser with wavelength of 2.94μm which is just close to the absorbency peak of water can be strongly absorbed by water molecular, so it has very wide application value in clinical medicine. In the paper, based on the mutual action characters of the laser with 2.94μm wave length on biological tissues, such as high absorption, acting on surface, the design of a new type of laser blood-sampling device is introduced. According to the needs of practice, the main component of the blood-sampling device is the laser, which includes optical resonator, optical collector, pumping source, optical guidance and focusing system. All of them are designed in the paper, and the reflection index of output coupling mirror of laser is optimized, the laser threshold is reduced, and pumping efficiency is improved. Moreover, thermal effect of Er:YAG solid-state laser is analyzed and a reasonable cooling method is designed. As a result, an excellent laser blood- sampling is obtained, the maximum output power is about 1J, the optical to optical conversion efficiency is 1.2%. For the better production-grade, the cuprum-based conduction is adopt to eliminate heat, the precision modulation and fixing of the optical resonance is achieved by the special adjusting structure that not only improve the stability and reliability, but also reduce the size of laser bloodsampling device. The size is 110×190×320mm, the weight is about 5.8kg, and the laser blood- sampling efficiency is 100%.

Proceedings Article | 18 May 2009 Paper

Method of laser mode selection based on silicon micro F-P cavity

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

Proceedings Volume 7284, 72840R (2009) https://doi.org/10.1117/12.832086

KEYWORDS: Silicon, Modes of laser operation, Semiconductor lasers, Mirrors, Reflectivity, Optical filters, Microelectromechanical systems, Electronic filtering, Optical components, Optics manufacturing

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The F-P cavity is the main structure of many optical components which relate to wavelength. From the research of micro-machine F-P cavity based on MEMS technology , we can obtain basic method and technical process of many kinds of MOEMS components for mode selection. In this article, basic structure and basic principle of silicon micro-machine F-P cavity are described. Influence of optical characteristics of the two mirrors on the F-P cavity property is analyzed, including influence of the reflectance of the two mirrors on the insertion loss and working range, the relationship between the F-P cavity length and the mode selection. A kind of method of laser mode selection based on silicon micro-machine F-P cavity is introduced. Through the movement of the elastic membrane as the upper mirror, the cavity length is adjusted, then the optical length of fixing wavelength is changed, the phase difference of different beams is varied, the reflectivity of micro-machine F-P Cavity is changed, so the method of laser mode selection is realized. The experimental process is expatiated in detail. It has advantages of minuteness volume, small insertion loss, high adjustment precision. The method of laser mode selection based on silicon micro-machine F-P cavity has laid firm foundation for the future research of laser mode selection.

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