激光与光电子学进展, 2015, 52(8): 081401, 网络出版: 2015-04-01

用于大气CO2浓度探测的高功率宽谱红外激光源

High Power Wide Spectrum Infrared Laser Source for Atmospheric CO2 Concentration Measurement
作者单位

湖北工程学院物理与电子信息工程学院, 湖北 孝感 432000

摘要
基于大气中CO2的超精细吸收光谱,利用超辐射发光二极管和掺铒光纤放大器来构建一种用于高精度大气CO2 浓度探测的宽谱红外激光源,其光谱范围远大于普通差分吸收激光雷达的光谱范围,能够实现宽谱探测技术的要求,而且不需要较高的锁频技术,避免了差分吸收激光雷达技术由于在on 波长处偏移引起的测量误差。实验结果表明,最终得到的宽谱红外激光源中心波长约为1584 nm,光谱有效范围为1564~1604 nm,输出光功率可达到2 W 以上,光纤放大器对该范围内光放大的最大增益可达34 dB 以上。该激光光源具有体积小、功率大、成本低和携带方便的优点,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
A wide spectrum infrared laser source can be designed by using a super luminescent light emitting diode (SLED) and an erbium doped fiber amplifier. This laser source can be used for detecting the atmosphere CO2 concentration with high precision, and this detecting technology is based on the ultra fine atmospheric CO2 absorption spectrum. The spectrum of SLED is much wider than that of 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 on wavelength shift. The experimental results show that the laser center wavelength is 1584 nm, spectral range is from 1564 nm to 1604 nm, output power is 2 W, and the max gain of the fiber amplifier is 34 dB at this spectral range. This laser has advantages of small size, high power, low cost and easy to carry, and it can help for the development of atmosphere CO2 concentration detecting by the wide spectrum infrared lidar technology.
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