Yb Fiber Laser Pumped Mid-IR Source Based on Difference Frequency Generation and Its Application to Ammonia Detection
Yb Fiber Laser Pumped Mid-IR Source Based on Difference Frequency Generation and Its Application to Ammonia Detection
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基于差频产生的镱光纤激光泵浦中红外光源及其在氨检测中的应用
DOI：
10.1143/jjap.40.625
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发表时间：
2001
影响因子：
1.5
通讯作者：
F. Tittel
中科院分区：
文献类型：
--
作者：
N. Matsuoka;S. Yamaguchi;K. Nanri;T. Fujioka;D. Richter;F. Tittel
报道了一种Yb光纤激光器泵浦的基于周期极化铌酸锂（PPLN）晶体差频产生的连续波窄线宽可调谐中红外光源，用于痕量气体检测。采用高功率Yb光纤激光器和分布反馈半导体激光器作为差频抽运源。该光源产生3 µm的中红外，功率为1.25 µW，光谱线宽小于30 MHz。通过改变DFB激光二极管的电流和温度，获得了300 GHz（10 cm-1）的频率调谐范围。在27 Pa的池压下，获得了3295.4 cm-1（3.0345 µm）的高分辨率NH3吸收多普勒展宽光谱，由此估计检测灵敏度为24 ppm·m。
A Yb fiber laser pumped cw narrow-linewidth tunable mid-IR source based on a difference frequency generation (DFG) in a periodically poled LiNbO3 (PPLN) crystal for trace gas detection was demonstrated. A high power Yb fiber laser and a distributed feedback (DFB) laser diode were used as DFG pump sources. This source generates mid-IR at 3 µm with a power of ∼2.5 µW and a spectral linewidth of less than 30 MHz. A frequency tuning range of 300 GHz (10 cm-1) was obtained by varying the current and temperature of the DFB laser diode. A high-resolution NH3 absorption Doppler-broadened spectrum at 3295.4 cm-1 (3.0345 µm) was obtained at a cell pressure of 27 Pa from which a detection sensitivity of 24 ppm·m was estimated.