Abstract

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 $\sim {10}^6$ over a $\sim 6\mathrm{ns}$ window at $55\mathrm{fs}$ time resolution (corresponding to the $9\mathrm{THz}$ 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.

© 2010 U.S. Government

Free-induction decay in molecular iodine measured with an extended-cavity diode laser

P. Dubé, M. D. Levenson, and J. L. Hall
Opt. Lett. 22(3) 184-186 (1997)

Interferometric observation of femtosecond free induction decay

Noriaki Tsurumachi, Takao Fuji, Sakae Kawato, Toshiaki Hattori, and Hiroki Nakatsuka
Opt. Lett. 19(22) 1867-1869 (1994)

Two-photon free-induction decay with electromagnetically induced transparency

J. F. Chen, Weixin Lu, Shuyuan Wang, M. M. T. Loy, G. K. L. Wong, and Shengwang Du
Opt. Lett. 35(11) 1923-1925 (2010)

Near-field THz imaging of free induction decay from a tyrosine crystal

A. Doi, F. Blanchard, H. Hirori, and K. Tanaka
Opt. Express 18(17) 18419-18424 (2010)

Sensitivity of coherent dual-comb spectroscopy

Nathan R. Newbury, Ian Coddington, and William Swann
Opt. Express 18(8) 7929-7945 (2010)