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Generation of mid-IR and visible radiation from four-wave amplification of ultrashort laser pulses in transparent dielectrics |
JOSA B, Vol. 30, Issue 3, pp. 708-716 (2013)
http://dx.doi.org/10.1364/JOSAB.30.000708
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Abstract
We analyze and simulate the generation of mid-IR radiation from the propagation of bichromatic laser pulses in transparent, centrosymmetric dielectrics. The process relies on using the beatwave associated with the bichromatic pulse to seed four-wave parametric amplification in the mid-IR. We derive propagation equations describing the evolution of the pump waves and scattered waves including the effects of third-order nonlinearity, dispersion, and finite laser spot size. An expression for the growth rate of the scattered waves due to four-wave mixing is derived in the limit of negligible pump depletion and is characterized for various transparent dielectric materials. For fused silica, it is found that a bichromatic pump with wavelengths near 1 μm can generate forward-directed radiation near 3 μm. Fully explicit particle-in-cell modeling shows exponential growth and high conversion efficiency to mid-IR and visible radiation when the beat-wave-generated frequency comb is tuned to overlap the gain band of the four-wave amplification process.
OCIS Codes
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing
(320.7110) Ultrafast optics : Ultrafast nonlinear optics
ToC Category:
Nonlinear Optics
History
Original Manuscript: November 29, 2012
Revised Manuscript: January 21, 2013
Manuscript Accepted: January 24, 2013
Published: February 26, 2013
Citation
Joseph R. Peñano, Daniel F. Gordon, and Bahman Hafizi, "Generation of mid-IR and visible radiation from four-wave amplification of ultrashort laser pulses in transparent dielectrics," J. Opt. Soc. Am. B 30, 708-716 (2013)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-30-3-708
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