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Proceedings Paper

Femtosecond pulse collapse in a quadratic nonlinear medium
Author(s): Jian Wu; Han Xu; Kun Wu; Heping Zeng
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Paper Abstract

Two-dimensional multicolored transverse arrays were generated in a quadratic nonlinear medium under the pump of two crossly overlapped femtosecond beams based on the cascaded non-collinear quadratic nonlinear couplings between the input pulses and quadratic spatial solitary waves originated from spatial breakup of one of the input beams with a small asymmetry. A probing supercontinuum pulse was diffracted and amplified with phase preservation, resulting in the formation of up-converted multicolor two-dimensional transverse arrays. By seeding with weak second harmonic pulses, the two-dimensional multicolored transverse patterns could be suppressed through weak beam control of the induced quadratic spatial solitary waves. At a high-intensity pump, colored conical emissions could be observed as a result of spatiotemporal collapse of femtosecond pulses in a quadratic medium. Seeded amplification of colored conical emission was demonstrated to support ultrabroadband up-conversion with a widely tunable range in wavelength and significantly high energy conversion efficiency.

Paper Details

Date Published: 9 July 2007
PDF: 13 pages
Proc. SPIE 6733, International Conference on Lasers, Applications, and Technologies 2007: Environmental Monitoring and Ecological Applications; Optical Sensors in Biological, Chemical, and Engineering Technologies; and Femtosecond Laser Pulse Filamentation, 67332T (9 July 2007); doi: 10.1117/12.753251
Show Author Affiliations
Jian Wu, East China Normal Univ. (China)
Han Xu, East China Normal Univ. (China)
Kun Wu, East China Normal Univ. (China)
Heping Zeng, East China Normal Univ. (China)


Published in SPIE Proceedings Vol. 6733:
International Conference on Lasers, Applications, and Technologies 2007: Environmental Monitoring and Ecological Applications; Optical Sensors in Biological, Chemical, and Engineering Technologies; and Femtosecond Laser Pulse Filamentation

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