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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 d B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。
Based on the hyperfine absorption spectrum of CO2 in the atmosphere, a superfluorescent LED and erbium-doped fiber amplifier were used to construct a wideband infrared laser source for high-precision detection of atmospheric CO2 with a much wider spectral range than the conventional differential absorption lidar The spectral range enables wide spectrum detection techniques without the need for high frequency locking techniques and avoids the measurement error caused by the drift of the differential absorption lidar due to on-wavelength shifts. Experimental results show that the wideband infrared laser source has a center wavelength of about 1584 nm, an effective spectral range of 1564 to 1604 nm and an output optical power of over 2 W. The maximum gain of the optical amplifier within the range of the optical amplifier can reach 34 d B above. The laser light source has the advantages of small size, high power, low cost and convenient carrying, and is helpful to realize the distribution of atmospheric CO2 concentration using a wide-band infrared laser radar.