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Open AccessArticle

Four-Wave Optical Parametric Amplification in a Raman-Active Gas

by 1,* and 1,2
1
Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
2
Division of Optoelectronics and Photonics, Center for Future Chemistry, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
*
Author to whom correspondence should be addressed.
Photonics 2015, 2(3), 933-945; https://doi.org/10.3390/photonics2030933
Received: 9 August 2015 / Revised: 27 August 2015 / Accepted: 27 August 2015 / Published: 31 August 2015
(This article belongs to the Special Issue Nonlinear Fiber Optics)
Four-wave optical parametric amplification (FWOPA) in a Raman-active medium is experimentally investigated by use of an air-filled hollow fiber. A femtosecond pump pulse shorter than the period of molecular motion excites the coherent molecular motion of the Raman-active molecules during the parametric amplification of a signal pulse. The excited coherent motion modulates the frequency of the signal pulse during the parametric amplification, and shifts it to lower frequencies. The magnitude of the frequency redshift depends on the pump intensity, resulting in intensity-dependent spectral characteristics that are different from those in the FWOPA induced in a noble-gas-filled hollow fiber. View Full-Text
Keywords: four-wave mixing; optical parametric amplification four-wave mixing; optical parametric amplification
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Kida, Y.; Imasaka, T. Four-Wave Optical Parametric Amplification in a Raman-Active Gas. Photonics 2015, 2, 933-945.

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