9 July 2007 Femtosecond pulse collapse in a quadratic nonlinear medium
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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.
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Jian Wu, Han Xu, Kun Wu, and Heping Zeng "Femtosecond pulse collapse in a quadratic nonlinear medium", 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; https://doi.org/10.1117/12.753251

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