In the ancient measurement of distance are measured by the method, and later to the size, the distance of the unit began to refine, the unit of measurement distance is used in China, Zhang, ruler, inch, etc., the international unit mm, cm, points Meters, kilometers. Measuring tools are tape, tape, meters and other steps, etc., these tools because of the use of methods and conditions of the limitations of the error is relatively large, and in some occasions the measurement is also time-consuming and laborious. The emergence of laser range finder to solve these problems.

　　Now the laser range finder can easily measure the distance, just by hand can be measured out of the distance, the area size can be easily calculated, do not need you to take the ruler to count, is a good helper to measure the distance, laser Rangefinder brand variety can be based on their own budget and practical use to determine the domestic laser range finder, cheap, but the performance is less stable than the import of imported laser range finder are more mature , But the price is much higher than domestic and sold more domestic and more complicated.

　　Thirty years, China's laser technology developed rapidly, made more than a thousand have a higher level of research results, and some also reached the advanced level of time. In this process, China has promoted hundreds of laser practical technology, and achieved good economic and social benefits. In scientific research and application to promote the simultaneous development is that China has a million people in the laser professional and technical team, can engage in a variety of laser science research and application development work.

　　The laser is the basis of laser research and application. Over the past three decades, China has successfully developed a laser that covers almost all the solid, gas, liquid, and semiconductor lasers that have been developed. Many well-known scientists have predicted that the 21st century life science will be the leading discipline, so the world attaches importance to the development of life sciences. The second half of this century, the application of laser in this field led to laser medicine, laser biology and other emerging edge of the birth of the discipline.

　　China's laser detector in the agricultural application began in the mid-60s, China's scientific and technological personnel in the laser to improve poultry, livestock varieties have done a lot of work. Which has been attached to the attention at home and abroad, the use of laser treatment of piglets, calves common disease.

　　China's optical fiber communication started in 1972, there are nearly 20 practical lines in Beijing, Shanghai, Tianjin, Guangzhou and other large cities and regions opened, the total communication distance of 5000Km fiber optic communications projects in all the fiber optic cable, lasers, , Modulators, detectors, passive devices such as manufacturing technology has been basically mastered in China, and some still in the world advanced level.