Supercontinuum generation in orientation-patterned gallium phosphide
Srivastava, Anchit Shrikant
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A supercontinuum from the blue/green to the red is generated by pumping orientation-patterned gallium phosphide crystal by femtosecond pulses from Yb:fibre laser. Experimentally, the supercontinuum is generated by focusing 32 nJ 100 fs pulses at 1040 nm into the OPGaP crystal, to a focus of w0=25 µm. Using a nonlinear envelope equation model developed in this work, a combine action of χ (2) and χ (3) nonlinearities is shown to be the origin of the supercontinuum generation. The modelling implies that high-order parametric gain pumped by the secondharmonic light of the laser and seeded by self-phase-modulated sidebands is responsible. The results represent the first time a visible supercontinuum has been generated in a bulk material using a low-energy high-repetition rate femtosecond laser.