Doppler-free resolution near-infrared spectroscopy at 1.28~$\mu$m with the noise-immune cavity-enhanced optical heterodyne molecular spectroscopy method

Tzu-Ling Chen, Yi-Wei Liu

We report on the Doppler-free saturation spectroscopy of the nitrous oxide (N${}_2$O) overtone transition at 1.28~$\mu$m. This measurement is performed by the noise-immune cavity-enhan…