Paul J B, Lapson L, Anderson J G
Appl Opt. 2001 Sep 20;40(27):4904-10. doi: 10.1364/ao.40.004904.
A simple and easy to use method that allows high-finesse optical cavities to be used as absorption cells for spectroscopic purposes is presented. This method introduces a single-mode continuous-wave laser into the cavity by use of an off-axis cavity alignment geometry to eliminate systematically the resonances commonly associated with optical cavities, while preserving the absorption signal amplifying properties of such cavities. This considerably reduces the complexity of the apparatus compared with other high-resolution cavity-based absorption methods. Application of this technique in conjunction with either cavity ringdown spectroscopy or integrated cavity output spectroscopy produced absorption sensitivities of 1.5 x 10(-9) cm(-1) Hz(-1/2) and 1.8 x 10(-10) cm(-1) Hz(-1/2), respectively.
本文提出了一种简单易用的方法，该方法可将高精细度光学腔用作光谱学目的的吸收池。此方法通过使用离轴腔对准几何结构将单模连续波激光引入腔内，以系统地消除通常与光学腔相关的共振，同时保留此类腔的吸收信号放大特性。与其他基于腔的高分辨率吸收方法相比，这大大降低了设备的复杂性。将该技术与腔衰荡光谱或集成腔输出光谱结合应用时，分别产生了1.5×10⁻⁹ cm⁻¹ Hz⁻¹/²和1.8×10⁻¹⁰ cm⁻¹ Hz⁻¹/²的吸收灵敏度。
