基于CO2的近红外吸收光谱特征,提出了一种可用于CO2排放源监测的光参量振荡(OPO)和 放大(OPA)系统,该系统由输入OPO的激光双种子源、OPO和OPA、带窄线宽激光种子源脉 冲Nd:YAG基频激光器、高精度和频率稳定的双通道波长计等组成,可交替输出1.572 μm的 双波长激光束。系统经初步调试后,泵浦脉冲能量为326 mJ时获得近25%的转换效率,脉冲 能量近80 mJ, 满足地基差分吸收激光雷达测量对流层CO2浓度廓线的需要。

Based on the near infrared absorption spectroscopy characteristics of CO2, an optical parametric oscillation (OPO) and amplification (OPA) system is proposed for the monitoring of CO2 emission sources. The system is composed of laser dual-seed source injected into OPO, OPO and OPA, narrow bandwidth laser seeded and pulsed Nd:YAG laser transmitting fundamental frequency, a dual-channel wavelength meter with high accuracy and frequency stability etc, which can output alternately dual-wavelength laser beams at 1.572 μm. After the system is debugged preliminarily, the conversion efficiency near 25% is obtained when the pump pulse energy is 326 mJ, and pulse energy is near 80 mJ, which can meet the need of ground-based differential absorption lidar measurements of CO2 concentration profiles in troposphere.