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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 17, Iss. 9 — Sep. 1, 2000
  • pp: 1626–1635

Femtosecond self-focusing dynamics measured by three-dimensional phase-retrieval cross correlation

Tai-Wei Yau, Chau-Hwang Lee, and Jyhpyng Wang  »View Author Affiliations


JOSA B, Vol. 17, Issue 9, pp. 1626-1635 (2000)
http://dx.doi.org/10.1364/JOSAB.17.001626


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Abstract

We use a phase-retrieval cross-correlation technique to analyze the spatiotemporal field evolution of self-focused ultrashort pulses. The technique features a new phase-retrieval algorithm based on functional differentiation. Its sensitivity, rapid convergence, and temporal nonreciprocality enable reliable three-dimensional waveform reconstruction. At less than the critical power, the experiments verify conventional description of self-focusing and give a direct proof of the Kerr-lens mode-locking mechanism. In contrast, for pulses with peak power much more than the critical power, nearly uniform self-focusing and quasi-stable single-filament trapping to a universal beam diameter were observed. The trapping can be explained by the saturation of the nonlinear refractive-index change at Δn∼7×10−5. The saturation is verified by an independent cross-polarization modulation measurement.

© 2000 Optical Society of America

OCIS Codes
(190.1900) Nonlinear optics : Diagnostic applications of nonlinear optics
(190.3270) Nonlinear optics : Kerr effect
(190.5530) Nonlinear optics : Pulse propagation and temporal solitons
(260.5950) Physical optics : Self-focusing
(320.2250) Ultrafast optics : Femtosecond phenomena
(320.7110) Ultrafast optics : Ultrafast nonlinear optics

Citation
Tai-Wei Yau, Chau-Hwang Lee, and Jyhpyng Wang, "Femtosecond self-focusing dynamics measured by three-dimensional phase-retrieval cross correlation," J. Opt. Soc. Am. B 17, 1626-1635 (2000)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-17-9-1626


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