Time-domain spectroscopy of the optical free-induction decay from vibrating molecules
Ian R. Coddington, William C. Swann, Nathan R. Newbury
Time-domain spectroscopy using dual, coherent frequency combs is used to measure free-induction decay from a molecular gas sample in the near-IR with a time-domain signal-to-noise ratio of ~106 over a ~6 ns window at 55 fs time resolution (corresponding to the 9 THz source bandwidth) and a frequency/timing accuracy set by the frequency combs. The free-induction decay exhibits the expected periodic pulses from the rephasing of the multiply excited rovibrational levels. This demonstration represents the first high-resolution, high-accuracy, broadband measurement of optical free-induction decay, to our knowledge.
, Swann, W.
and Newbury, N.
Time-domain spectroscopy of the optical free-induction decay from vibrating molecules, Optics Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=903774
(Accessed December 8, 2023)