Laser crystal absorbs the pumping light energy, produces fluorescence radiation and heat at same time. The heat non-uniform temperature causes in the crystal and causes thermal distortion of crystal. Thermal effect of the crystals seriously affects LD pumped solid state lasers’performance. In this paper, we study thermal distortion of the laser crystal by the theory
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With the fast development of computer and a microelectronic technology, digitalimage processing emerged and became a new discipline. In the finance，military, theindustry, the medicine, domains, agriculture, transportation, public security, survey,meteorology, address and so on ,it obtained the universal application. Moreoveralong with unceasing development of the theory, the method and the technical ofdigital image processing，its application
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The People’s Republic of China is a country of relatively meager forest resources. How to use wood efficiently has an important economic and social significance. Strict quality detection of forest product materials is the prerequisite to ensure the efficient use of wood. According to statistics, seventy-five percent of wood quality problems are caused by inaccurate
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