Direct observation of the terahertz optical free induction decay of molecular rotation absorption lines in the sub-nanosecond time scale

Journal Article · Mon Sep 24 00:00:00 EDT 2012 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4754826· OSTI ID:22080454

Chesnokov, E N; Koshlyakov, P V ^[1]; Kubarev, V V ^[2]; Kulipanov, G N ^[2]

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1. Institute of Chemical Kinetics and Combustion, Novosibirsk 630090 (Russian Federation)
2. Budker Institute of Nuclear Physics, Novosibirsk 630090 (Russian Federation)

Optical free induction decay (FID) in the region of 60-75 cm{sup -1} was detected using 120 ps pulses of free electron laser. Signals were detected in real time using ultra-fast Schottky diode detectors. The oscillations corresponding to the splitting of absorption lines in deuterated water vapor ({Delta}f = 0.15 cm{sup -1}) and hydrogen bromide ({Delta}f = 0.02 cm{sup -1}) were detected. At high optical density, we observed the oscillations arising from 'top-hat' shape of absorption lines. Free induction decay signals could be detected in a single shot. This observation allowed obtaining a spectrum in one laser pulse, which facilitates studies of very fast processes.

• OSTI ID: 22080454
• Journal Information: Applied Physics Letters, Vol. 101, Issue 13; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION
FREE ELECTRON LASERS
HYDROGEN BROMIDES
LASER RADIATION
OPACITY
OSCILLATIONS
ROTATION
SCHOTTKY BARRIER DIODES
SPECTRA
VISIBLE RADIATION
WATER VAPOR