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。
它被称为光外差检测,用于读出由光干涉产生的拍音的频率。
当两个激光器的发光波长相距很远时,拍音的频率会更高,因此,需要具有高响应频率的光电检测器来检测覆盖更宽波长范围的拍音。
滨松光子学株式会社提供适当的组件来执行光外差检波:具有 MIR(中红外)灵敏度和高响应特点的 QCD、高稳定性 QCL 和具有超低噪声特性的 CW 控制器。
两个相干光源(即激光器)如果具有接近但略有不同的波长,就会基于频率差产生相应的节拍信号。
该节拍信号称为光拍或拍音,拍音的频率称为拍频。拍音灵敏地反映了创造拍音的激光器的强度、相位或频率的变化。
因此,拍音广泛用于各种技术,例如高灵敏度或高波长分辨光谱技术。
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