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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry M. Van Driel
  • Vol. 24, Iss. 8 — Aug. 1, 2007
  • pp: 1886–1900

Femtosecond pulse shaping in the mid-infrared generated by difference-frequency mixing: a simulation and experiment

Masaaki Tsubouchi and Takamasa Momose  »View Author Affiliations


JOSA B, Vol. 24, Issue 8, pp. 1886-1900 (2007)
http://dx.doi.org/10.1364/JOSAB.24.001886


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Abstract

We have examined phase- and amplitude-modulated femtosecond laser pulses in the mid-infrared (MIR) region ( 3 10 μ m ) generated by difference-frequency mixing both theoretically and experimentally. Transfer of the pulse shape from near infrared to MIR by a difference-frequency process was evaluated in detail for various spectra, linear chirps, phases, and optical delays of two pulses before the different frequency was compared and with experimentally obtained MIR shapes. In the experiment, the signal pulse of an optical parametric amplifier was shaped with an acousto-optic programmable dispersive filter and mixed in an AgGaS 2 crystal with the idler pulse that was temporally stretched by passing it through a dispersion block to generate a shaped MIR pulse. The agreement between the theory and experiment was reasonable despite the complicated experimental procedure. It was demonstrated that the resultant MIR pulse shape could be completely different from the pulse shape before the difference-frequency generation. However, it is possible to reproduce any shape of MIR pulses by predicting the pulse shape using the present theoretical framework. This will allow us to manipulate rovibrational wave packets of real molecules for practical applications.

© 2007 Optical Society of America

OCIS Codes
(020.0020) Atomic and molecular physics : Atomic and molecular physics
(190.2620) Nonlinear optics : Harmonic generation and mixing
(230.1040) Optical devices : Acousto-optical devices
(300.6340) Spectroscopy : Spectroscopy, infrared
(320.5540) Ultrafast optics : Pulse shaping

ToC Category:
Nonlinear Optics

History
Original Manuscript: October 27, 2006
Revised Manuscript: March 8, 2007
Manuscript Accepted: April 27, 2007
Published: July 19, 2007

Citation
Masaaki Tsubouchi and Takamasa Momose, "Femtosecond pulse shaping in the mid-infrared generated by difference-frequency mixing: a simulation and experiment," J. Opt. Soc. Am. B 24, 1886-1900 (2007)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-24-8-1886

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