Journal
OPTICS EXPRESS
Volume 14, Issue 13, Pages 6194-6200Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.14.006194
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A 100-GW optical parametric chirped-pulse amplifier system is used to study nonlinear effects in the 1.54 mu m regime. When focusing this beam in air, strong third-harmonic generation (THG) is observed, and both the spectra and efficiency are measured. Broadening is observed on only the blue side of the third-harmonic signal and an energy conversion efficiency of 0.2% is achieved. When propagated through a 10-cm block of fused silica, a collimated beam is seen to collapse and form multiple filaments. The measured spectral features span 400-2100 nm. The spectrum is dominated by previously unobserved Stokes emissions and broad emissions in the visible.
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