外文翻译——中国激光技术发展回顾与展望

China's laser technology development Retrospect and Prospect

"Laser" is "LASER" translation. LASER was originally Light amplification by stimulated emissi on of radiation from a combination of the prefix specific terms, in our country has been translated into "Laise," "lasing light," and "optical amplifier by stimulated emission." 1964, Qian Xuesen academicians proposal named "Laser", reflects not only the "stimulated emission," the scientific connotation, and that it is a very strong source of new, appropriate, vivid and concise, by the Chinese scientific

community consensus and in use ever since.

From the 1961 China first laser that has successfully developed throughout the country, laser research, teaching, production and use of units under joint efforts, China has formed a complete range, the advanced level, the application of laser technology to a wide range of fields, and made the industrialization of encouraging progress for China's science and technology, national defense and national economy and made

positive contributions in the international arena has also gain a place.

China's early development of laser technology

1957, in Changchun Wang Shouguan, such as China's first professional optical Institute - the Chinese Academy of Sciences (Changchun) optical precision instruments Machinery Research Institute ( "-ray machine"). In the older generation of experts under the leadership of a number of young science and technology workers will grow rapidly, Deng Ximing is one of the outstanding representatives. As early as in 1958 the United States physicist Xiaoluo, Townes on the principle of laser famous paper published soon, he will actively promote this new technology research carried out in a short time the combination of the innovative spirit of the young and middle-aged research team proposed substantial increase brightness light source, color units, coherence of ideas and experimental programmes. 1960 World first laser come out. Summer 1961, under the auspices of Wang Jiang, China's first ruby laser developed. Within a short space of a few years, laser technology developed rapidly, and produce a number of advanced achievements. Various types of solids, gases, chemicals and semiconductor lasers have been successfully developed. In the basic research and key technologies, a series of new concepts, new methods and new technologies (such as mutation and cavity Q-to-Q, traveling wave amplification, Re-use system, free electron oscillations radiation, etc.) have been put forward and

implemented, and many of them are unique.

At the same time, as a high-brightness, high-directional, high-quality, and other advanced features of the new light source, laser used in various technical fields quickly, demonstrating a strong vitality and competitiveness. Communications, in September 1964 by television pictures transmitted laser demonstration, in November 1964 to achieve 3 to 30 km calls. Industries, in May 1965 laser drilling machine successfully used Drawing Die Blanking production, acquisition significant economic benefits. Medicine, June 1965 retinal laser welding for the animals and conduct clinical trials. National defense, in December 1965 successfully developed laser rangefinder Diffuse Reflectance (accuracy of 10 meters / 10 km), in April 1966 developed remote control pulse laser Doppler velocimeter. Along with the theory study of the laser self-mixing interference becoming maturer higher increasingly, the application in vibration, micro-displacement and velocity measure based on this technology become broader. The technic requires real-time acquisition and processing for the laser interferometer signal. The data acquisition and processing system of traditional vibrometer is structural complex, high cost and difficult to carry. With the high running speed and high-precision computing, digital signal processor(DSP) is suitable for the laser self-mixing interference signal acquisition and processing. In this paper, the technology of laser self-mixing interference modulated by triangular wave current is researched. It studies theoretical model of the vibration system and uses Matlab for algorithms simulation and error analysis, also discusses how to minish the error. A data acquisition and processing system which adopts TMS320LF2407A DSP from TI as a central processor is designed. The designing and realization plan of system for hardware is proposed in detail, including DSP mini system, DSP and ADC interface circuit, signal conditioning circuit, LCD display module and DSP interface circuit, RS232 communication circuit etc, technology on hardware designing is also discusssed in the dissertation. The designing and realizing process of system for software is analyzed as followed, which consists of application of CCS, planning of CMD document, data acquisition and processing module, LCD display module and serial communication module based on Matlab. Practice shows that this data acquisition and processing system can withstand stable operation, satisfy the demand of the high-speed alternating laser self-mixing interference signal and reconstructs the vibration waveform of detected objects. Because of the DSP technology, the cost of vibrometer greatly reduced and simplified structure, easy to carry. It also provides the conditions for the vibrometer which is based on laser self-mixing interference to small,