Study On The Efficiency And Stability Of The Solid State Laser With Optical-contact Crystal And Application In Coal Mine Monitoring

In this thesis, a laser source used in the mine surveying is studied. Mine Surveying is animportant process during the mine construction and production. In the mine surveying, opticalmeasurement system has been widely applied, such as: laser pointer, gas monitoring, roadwaysection measurement, optical personnel positioning. Laser is directional, monochromatic, andcoherent and ideal for optical measurements. In roadway measurements and optical personnellocation, lasers are absolutely possible to be used. Green optical-contact crystal lasers in low powerhave lots of advantages. Such as the compact structure, high efficiency, easy carrying, long life.those lasers are able to obtain high output power and high beam quality, and are suitable used in theoptical measurement system in coal mining. In this paper, how to improve pumping efficiency, andensure the stability of the output power is extensively studied. Based on the principle, greatprogressing and achievement has been made in analyzing the characteristics of the pump source andderiving three factors of pump source affect to pumping efficiency, in designing the optimal couplinglens, deeply researching the temperature characteristics of the crystal, selecting quickly andefficiently the high quality crystal in the method of changing the temperature of the optical-contactcrystal in three steps.