应用于低噪声DPSL的高精度温度控制器

High precision temperature controller applied in low noise DPSL system

在LD泵浦固体激光器(DPSL)系统中温度变化对光电器件及腔参数影响明显,这对器件的温度控制提出了高精度和高稳定性的要求。给出了基于MAX1968专用控制芯片研制的一种高精度温度控制系统,采用半导体热电制冷器(TEC)作为温控器件,AT89C52单片机作为核心控制,通过PID处理优化温度控制,实现控温精度±0.02℃。该温控器还可提供高达3 A的电流驱动TEC,双向电流驱动可提供制冷和制热,以保证系统快速达到热平衡。该系统应用于低噪声DPSL系统,可使DPSL系统的光功率噪声小于1%。

The effect of temperature changing in some photoelectric components on the parameter in Diode-Pumped Solid-State Laser is obvious. So it＇s necessary to control the temperature of the component precisely and stablely. A high precision temperature controller based on MAX1968 and used in DPSL system was introduced. Here, TEC was used as heater or cooler device. By PID processing, temperature control was optimized. The system temperature unstability was less than 0.02 ℃. It could provide 3 A to the TEC circuit, and the bidirectional driving mode could make TEC cool or heat to achieve system heat balance. When applyed in low noise DPSL system, it can ensure that the noise of light power is less than 1%.