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摘要:
为了实现激光器稳定且安全地输出，设计了一款基于515-nm的大功率激光器控制系统。首先，对该系统的泵浦驱动模块进行研究，利用现场可编程门阵列（FPGA）完成对模块的模拟采样并在数字信号处理（DSP）中完成计算输出，采用数字PID方式完成恒流源的闭环控制；其次，使用半导体制冷器（TEC）实现倍频晶体模块的稳定温度控制，以热敏电阻（NTC）作为反馈实现温度控制；最后，设计了激光器的人机交互系统，实现了对激光器内部状态的实时监测、判断与存储。为了验证控制系统的有效性，选择一款泵浦进行测试。实验结果表明：泵浦驱动模块能够持续稳定地工作，控制系统能够实时监测激光器的内部状态，安全可靠。倍频后的激光器输出中心波长为514.98 nm，功率可达170 W，光功率稳定度为±0.07 dB，并且控制系统的所有器件及设备均100%采用国产化，满足515-nm大功率激光器的系统设计需求。
Abstract:In order to realize the stable and safe output of lasers, a control system based on a 515-nm high-power laser is designed. Firstly, the pump drive module of the system is studied. The analog sampling of the module is completed by Field Programmable Gate Array (FPGA) and the calculation output is completed in Digital Signal Processing (DSP). The closed-loop control of the constant current source is completed by using the digital Proportion-Integral-Derivative (PID) algorithm. Secondly, a Thermo Electric Cooler (TEC) is used to achieve the stable temperature control of the frequency doubling crystal module, and the Negative Temperature Coefficient (NTC) is used as the feedback to realize the temperature control. Finally, the human-computer interaction system of the laser is designed, which realizes the real-time monitoring, judgment and storage of the internal state of the laser. In order to verify the effectiveness of the control system, a pump is selected for testing. The experimental results show that the pump drive module can work continuously and stably, and the control system can monitor the internal state of the laser in real time, which is safe and reliable. The laser output center wavelength after frequency doubling is 514.98 nm, the power can reach 170 W, and the optical power stability is ±0.07 dB. All devices and equipment for the control system are made in China, meeting the system design requirements of 515-nm high-power laser.
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Key words:
- fiber laser /
- pump drive module /
- laser control system
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图 2 大功率激光器控制系统原理框图
Figure 2. Functional block diagram of the high power laser control system
图 4 倍频温控模块示意图
Figure 4. Schematic diagram of the frequency doubling temperature control module
表 1 温度测试结果
Table 1. Results of temperature measurements
(°C) Expected
temperature1st
Measured
temperature2nd
Measured
temperature3rd
Measured
temperatureAverage
temperature|Max
error|40 39.98 40.01 39.99 39.99 0.02 41 41.02 40.99 41.01 41.01 0.02 42 42.03 42.02 41.99 42.01 0.03 43 42.99 42.99 43.01 43.00 0.01 44 44.02 43.97 44.01 44.00 0.03 45 44.99 45.01 45.02 45.01 0.02 46 46.01 45.98 45.99 45.99 0.02 47 47.01 47.03 46.99 47.01 0.03 48 48.01 48.01 47.99 48.00 0.01 49 48.99 48.98 49.01 48.99 0.02 50 50.01 50.03 49.99 50.01 0.03 
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