Model for in-coupling of etalons into signal strengths extracted from spectral line shape fitting and methodology for predicting the optimum scanning range-demonstration of Doppler-broadened, noise-immune, cavity-enhanced optical heterodyne molecular spectroscopy down to 9 x 10(-14) cm(-1)

作者：Silander Isak; Hausmaninger Thomas; Axner Ove^*

来源：Journal of the Optical Society of America B-Optical Physics, 2015, 32(10): 2104-2114.

DOI：10.1364/JOSAB.32.002104

Expressions for the in-coupling of white noise and etalons into fitted signal strengths are derived. These show that the amount of noise picked up is affected by the scanning range. A methodology for finding the optimum scanning range from a single set of measurements has been developed. This was used to estimate the optimum conditions of a noise-immune, cavity-enhanced optical heterodyne molecular spectroscopy (NICE-OHMS) setup. The methodology was validated by measurements. This resulted in a spectral noise equivalent absorption per unit length of 2.6 x 10(-13) cm(-1) Hz(-1/2) and a minimum Allan deviation of 9 x 10(-14) cm(-1) at 30 s, which are, to our knowledge, the lowest reported for Doppler-broadened NICE-OHMS.

• 出版日期2015-10-1