Research On Stabilizing And Controlling Techniques For Single-frequency Solid-state Laser Output Power

Single-frequency solid-state laser is widely used for its advantages of small volume, high efficiency, good beam quality, and long longevity etc. Output power control system is the important equipment for single-frequency solid-state laser normally working. Its performance has large influence on the solid-state laser's characteristics such as the conversion efficiency and beam quality etc. It is a key technology for single-frequency solid-state laser to be widely used.On the basis of analyzing the characteristics of which affect the stability of the output power, a new type of single-frequency solid-state laser output power control system has been designed in this thesis. A control system uses the L01 integrated sensor as output power sensor, the 18B20 digital thermometer as temperature sensor and a high performance microprocessor ADuC848 as a control core, to control the single-frequency solid-state laser's output power. The main contents of the thesis are as follows:Firstly, the research status and significance of single-frequency solid-state laser output power stability control system have been summarized. The content and design requirements of this thesis have been confirmed.Secondly, the working principle and composition of single-frequency solid-state laser have been introduced. The factors that affect the output power of single-frequency solid-state laser have been analyzed. The results indicate that the temperature changing of LD and laser crystal, the fluctuations of LD injection current are the main factors that affect the stability of its output power. Based on this, the Control program of stable single-frequency solid-state laser output power has been developed, that is, the LD and the laser crystal temperature should be stabled firstly, and then based on the linear relation characteristics between output power and injection current of LD when injection current is greater than the threshold current, the stability control of the single-frequency solid-state laser output power are executed.Thirdly, the single-frequency solid-state laser output power control system hardware and control software have been designed. System mainly includes the collection, processing, display and output sections of temperature and power. The hardware and software system have been debugged.Lastly, the test system is built. The effect of control system is examined experimentally. The results indicate that the outpower of 1064nm single-frequency Nd:YAG laser can be controlled in 130 minutes with a stability of 1.29%.The single-frequency solid-state laser output power control system has been researched and developed in this thesis. With the advantages of high integration, good effect, reliable working etc, the system has good engineering value.