Mid-infrared cavity ring-down spectroscopy using DFB quantum cascade laser with optical feedback for radiocarbon detection
Mid-infrared cavity ring-down spectroscopy using DFB quantum cascade laser with optical feedback for radiocarbon detection
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DOI：
10.35848/1347-4065/abb20e
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发表时间：
2020-09
影响因子：
1.5
通讯作者：
R. Terabayashi;Keisuke Saito;V. Sonnenschein;Y. Okuyama;T. Iguchi;M. Yamanaka;N. Nishizawa;K. Yoshida;S. Ninomiya;H. Tomita
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文献类型：
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作者：
R. Terabayashi;Keisuke Saito;V. Sonnenschein;Y. Okuyama;T. Iguchi;M. Yamanaka;N. Nishizawa;K. Yoshida;S. Ninomiya;H. Tomita
提出了一种基于光反馈的分布反馈量子级联激光器（DFB-QCL）用于中红外（MIR）腔衰荡光谱（CRDS）14C谱仪的线宽压缩方法。一个猫眼反射器以及一个赫里奥特细胞的路径长度增强被用于一个紧凑的光学设置。通过监测DFB-QCL和MIR光学频率梳（OFC）之间的拍频来评估激光线宽。通过光反馈的线宽减小被清楚地观察到，虽然缓慢的频率漂移所造成的环境变化仍然是可见的。为了长期稳定和精确的频率扫描，对OFC进行了低带宽拍音锁定，从而成功地证明了利用光学反馈的MIR CRDS进行14C测量。
A linewidth reduction of a distributed feedback quantum cascade laser (DFB-QCL) based on optical feedback for a mid-infrared (MIR) cavity ring down spectroscopy (CRDS) 14C spectrometer is presented. A cat-eye reflector as well as a path-length enhancement by a Herriott cell were employed for a compact optical setup. The laser linewidth was evaluated by monitoring the beat frequency between the DFB-QCL and a MIR optical frequency comb (OFC). The linewidth reduction by optical feedback was clearly observed although slow frequency drifts caused by environmental changes were still visible. A low-bandwidth beat-note lock to the OFC was conducted for long-term stabilization as well as for precise frequency scanning and thereby 14C measurement by MIR CRDS with optical feedback was demonstrated successfully.