【作者】 陈建新；

【导师】 王加贤；

【作者基本信息】 华侨大学 ， 电子与通信（专业学位）， 2013， 硕士

【摘要】 激光器自20世纪60年代发明以来，经过几十年的发展，已经成为我们日常生活、工业、农业、军事领域、航空航天领域、生物医疗领域等不可或缺的一部分。虽然我国对半导体激光器的研究紧跟国外的步伐，但是对其驱动电源的研究与发达国家相比还有一定的差距，特别是同时对驱动电流脉冲幅度及脉宽可调方面的研究较少。本文正是基于此，并结合课题的需要，研制一台大功率、脉冲及电流可调的LD驱动电源。本文在分析温度、电流等对半导体激光器输出特性影响的基础上，结合各项指标，考虑LD各种损坏的可能性，提出一套半导体激光器驱动电源的综合设计方案。系统包含供电电路、电流控制、温度控制、系统防护以及人机界面等。供电电路根据不同的需求采用线性串联型稳压和开关降压型稳压相结合的方式。以微控制器STM32F103RCT6的12位快速DA输出作为电流控制信号，通过高速、低噪声运算放大器OP37与采样电流的比较结果调整驱动管，实现对脉冲的脉宽、占空比、重复率等控制，调节输出电流幅度。电流稳定度优于0.5%，脉冲上升沿小于50nS。温控部分，采用美国AD公司的ADT7420采集，并以基于数字PID算法的H桥驱动电路驱动半导体制冷片，控制LD工作温度。浪涌、静电、过流和过温等防护措施采用硬件加以控制，起到软件、硬件双重防护的效果，延长LD的使用寿命。最后对系统的性能进行综合测试，验证设计方案的可行性。使用该电源驱动半导体激光器获得808nm脉冲激光，以此激光泵浦Nd:YAG晶体组成的DPSSL系统，结合腔内倍频，获得473nm蓝光输出。更多还原

【Abstract】 Since the invention of the laser, it has become the absolutely necessary part of our daily life,industry, agriculture, military, aerospace or bio medical field over the past few decades in the1960s.The research on semiconductor laser in our country could cath up with the pace of foreign,but in the aspect of driving power, it is still gap behind compared with the developed countries,especially adjusting the pulse amplitude and width of driving current at the same time.Accordingto the needs, this paper aims at making a high-power, adjustable pulsed and current LD drivingpower.After analyzing the effects of temperature and current on the output characteristics ofsemiconductor lasers, combining with all indicators, considering the possibility of damages, thispaper presents a comprehensive design of semiconductor laser driver.The system includes powersupply circuit, current control, temperature control, system protection and GUI etc.The power supply circuit uses linear series regulator combining with switch buck regulatoraccording to different requirements.The MCU, STM32F103RCT6with12-bit DAC, was used asthe signal of current control. It adjusts the drive pipe,which is result comparison of the samplingcurrent and OP37, high speed and low noise operational amplifier. Then it controls the pulsewidth, duty cycle, repetition rate, and adjusts the output current amplitude.The current stability isbetter than0.5%, and the rising edge of the pulse is less than50ns.In the temperature control parts,it uses the sensor chip ADT7420to capture the temperature data. The H-bridge circuit based onthe digital PID algorithm drives the semiconductor refrigeration piece to control the temperatureof LD.It is safe with current surge,static electricity,overcurrent and overtemperature protection bycontrolling hardware circuit.The effect of the software and hardware double protection，prolongsthe service life of LD.At last, test the system performance, verify the feasibility of design. Using the power drivensemiconductor laser pulse808nm laser, the laser pumped Nd:YAG crystal composed of DPSSLsystem, combined with the intracavity frequency doubling,473nm blue laser.更多还原