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In this paper, the contaminants on the substrate surfaces are cleaned using Q-switched pulse laser irradiation, which with pulse duration typically about 20ns and wavelength typically in the 1064nm or 532nm. A new mechanism for laser cleaning is proposed, which based on opto-acoustic effect that breakdown of the air above the target is obtained by a laser beam, and a laser-induced shock wave is produced to remove the various pollutants on the solid substrate surfaces.This method is much more effective than traditional conservative cleaning techniques including the continuous wave laser cleaning, there are many advantages for this new laser cleaning technology, such as the dry treatment, non-contact, non-damage to the substrate, no environmental pollution, and energy-economic, and so on. We make the theoretical analysis for this physical model of cleaning contaminant in detail and provided some experimental results and photographs.

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Spectrometer plays an important role, and is already an indispensable analytical instrumentation especially in biomedical, chemical and other fields. Instrument miniaturization will expand its application areas. And miniaturization design for all parts of optical path is the key to the whole task. This paper focuses on the research of the luminous source system design used in broad-band (200nm~1100nm) spectrometer. Considering the source wave band, a combination of deuterium lamp and tungsten lamp are chosen. According to the structure of the source, the main work concerns a collecting agglutinate lens and an elliptical reflector which acts as a light coupler. The optical design and the overall structure's optical path are simulated. On the basis of optical design and the selection as well as manufacture of the key components, the light source optical system of the project was analyzed experimentally and the results are satisfactory.

In this paper, an advanced high-power mini-waveguide CO2 laser for the industry is presented. The device is all made of metal materials. The two large annular electrodes are transversely excited by RF power . And the technique of diffusion cooling is used.