Linear and Nonlinear Time- and Frequency-Domain Spectroscopy with Multiple Frequency Combs
Abstract
Two techniques that employ equally spaced trains of optical pulses to map an optical high frequency into a low frequency modulation of the signal that can be detected in real time are compared. The development of phase-stable optical frequency combs has opened up new avenues to metrology and spectroscopy. The ability to generate a series of frequency spikes with precisely controlled separation permits a fast, highly accurate sampling of the material response. Recently, pairs of frequency combs with slightly different repetition rates have been utilized to down-convert material susceptibilities from the optical to microwave regime where they can be recorded in real time. We show how this one-dimensional dual comb technique can be extended to multiple dimensions by using several combs. We demonstrate how nonlinear susceptibilities can be quickly acquired using this technique. In a second class of techniques, sequences of ultrafast mode locked laser pulses are used to recover pathways of interactions contributing to nonlinear susceptibilities by using a photo-acoustic modulation varying along the sequences. We show that these techniques can be viewed as a time-domain analogue of the multiple frequency comb scheme. %We compare the two techniques: in both, an optical high frequency is mapped into a low frequency modulation of the signal that can be detected in real time.
Cite
@article{arxiv.1708.05728,
title = {Linear and Nonlinear Time- and Frequency-Domain Spectroscopy with Multiple Frequency Combs},
author = {Kochise Bennett and Jeremy Rouxel and Shaul Mukamel},
journal= {arXiv preprint arXiv:1708.05728},
year = {2017}
}