Abstract We present an experimental investigation of a filamentation-assisted fourth-order nonlinear optical process in KTP crystals pumped by intense 1.53 eV (807 nm) femtosecond laser pulses. Femtosecond light pulses at 2.58 eV (480 nm) are generated by the fourth-order nonlinear polarization , where corresponds to the pump frequency and to the supercontinuum generated through filamentation). If the system is seeded by a laser beam at or and there are spatial and temporal overlaps with the pump beam, and are simultaneously amplified. When the intensity of the seed laser beam exceeds a certain intensity threshold, the contribution of becomes non-negligible, and the amplification weakens. The conversion efficiency from the pump to the signal at 2.58 eV (480 nm) attains to 0.1%.
(Beam characteristics: profile, intensity, and power; spatial pattern formation)
Fund: Project supported by the National
Basic Research Program, China (Grant No.~2006CB806007), and the
National Natural Science Foundation of China (Grant Nos.~10574006,
10634020 and 10821062).
Cite this article:
Zhang Xi-Peng(张喜鹏), Jiang Hong-Bing(蒋红兵), Chen Li(陈利), Jiang Ying-Ying(蒋莹莹), Yang Hong(杨宏), and Gong Qi-Huang(龚旗煌) Filamentation-assisted fourth-order nonlinear process in KTP crystal 2010 Chin. Phys. B 19 034209
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