分布式反馈 (DFB) 激光器具有卓越的光谱分辨率能力,能够检测单条分离的气相分子吸收线。
可调谐二极管激光吸收光谱法 (TDLAS)是一种采用半导体激光器的光谱技术。锯齿波形电流(斜升波)注入支持根据 DFB 激光器发光的可变特点(取决于工作温度和注入电流强度)来调谐 QCL 的发光波长。此外,TDLAS 使用锁定放大器执行高灵敏度光谱分析,以检测激光器的周期调制。
CW 控制器 C16174-01 是一款具有超低噪声特性的半导体激光器驱动器。C16174-01 是执行 TDLAS 的理想控制单元,因为它具有以下能力:波长调制功能和具有 1 mK 稳定性的 TEC (珀尔帖)控制器。已知 DFB QCL 的理论线宽小于 1 kHz。 *1 利用这种出色的线宽特点进行高精度检测时,低噪声电源是必不可少的装置。当您使用高抖动或高纹波的嘈杂激光驱动器时,QCL 的线宽可能会下降到 300 GHz 左右。低噪声驱动器和 DFB QCL 的组合是实现窄线宽和高精度测量的理想解决方案。
1.“测量室温 DFB 量子级联激光器的频率噪声和固有线宽”, Opt. Express,19,179996 (2011)
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