Opt Lett. 2018 Oct 15;43(20):5094-5097. doi: 10.1364/OL.43.005094.
We demonstrate cantilever-enhanced photoacoustic spectroscopy in the mid-infrared using a supercontinuum source. The approach is broadband and allows for higher photoacoustic signal intensity and an enhanced signal-to-noise ratio as compared to systems employing conventional black body radiation sources. Using this technique, we perform spectroscopic measurements of the full ro-vibrational band structure of water vapor at 1900 nm and methane at 3300 nm with relative signal enhancement factors of 70 and 19, respectively, when compared to measurements that use the black body radiation source. Our results offer a novel perspective for photoacoustic detection opening the door to sensitive broadband analyzers in the mid-infrared spectral region.
我们展示了利用超连续源在中红外波段进行的悬臂增强光声光谱学。与采用传统黑体辐射源的系统相比，这种方法具有宽带特性，可实现更高的光声信号强度和增强的信噪比。使用这种技术，我们对 1900nm 处水蒸气的全旋转-振动带结构和 3300nm 处甲烷进行了光谱测量，与使用黑体辐射源的测量相比，分别获得了 70 和 19 的相对信号增强因子。我们的结果为光声检测提供了新的视角，为中红外光谱区域的灵敏宽带分析仪开辟了道路。
