基于宽谱大气CO<sub>2</sub>浓度探测的红外激光波长选择

通过分析大气中CO₂的超精细吸收光谱来选择适合宽谱大气CO₂浓度探测的红外激光波长，为研制宽谱红外激光雷达提供了依据。宽谱红外激光雷达的光谱范围远大于普通差分吸收激光雷达的光谱范围，不需要较高的锁频技术，能够避免差分吸收激光雷达由于在on 波长处偏移引起的测量误差。对比大气中水汽的吸收光谱、超辐射发光二极管(SLED)的发光光谱，以及铟镓砷(InGaAs)红外探测器的响应光谱，可以在理论上确定满足大气CO₂ 浓度探测的宽谱红外激光中心波长约为1572 nm，波长范围约为1568~1575 nm。通过设计实验装置，得到中心波长为1571 nm，波长范围为1564~1578 nm，输出功率约为0.01 mW 的宽谱红外激光。该波段宽谱红外激光避开了大气中水汽吸收的影响，而且模块简单、容易实现，对实现利用宽谱红外激光雷达探测大气CO₂浓度分布有一定的帮助。

Abstract

By analyzing the ultra fine atmospheric CO₂ absorption spectrum, the infrared laser wavelength can be choiced for detecting the atmosphere CO₂ concentration. It can provide the basis for a wide spectrum infrared lidar. The spectrum of wide spectrum infrared laser is much wider than the differential absorption lidar, and it has no use for high frequency locking technology. Also, this technology can avoid differential absorption lidar measurement error by the on wavelength shift. By analyzing the water vapour absorption spectrum, super luminescent diode (SLED)′s luminescent spectrum and InGaAs infrared detector′s response spectrum, the wide spectrum laser center wavelength is 1572 nm and the spectral range is 1568~1575 nm in theory. By the experimental laser source,the results show that the center wavelength is 1571 nm, the spectral range is 1564~1578 nm, the output power is 0.01 mW. This laser can avoid the influence by the water vapour absorption, and it is simple, low cost and easy to build. It can help for the development of the atmosphere CO₂ concentration detecting by the wide spectrum infrared lidar.

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林宏, 周传璘, 赵娜, 黄攀立. 基于宽谱大气CO₂浓度探测的红外激光波长选择[J]. 激光与光电子学进展, 2015, 52(12): 120102. Lin Hong, Zhou Chuanlin, Zhao Na, Huang Panli. Wavelength Choice for Infrared Laser Based on Atmospheric CO₂ Concentration Wide Spectrum Measurement[J]. Laser & Optoelectronics Progress, 2015, 52(12): 120102.

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