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Optical parametric generation of a mid-infrared continuum in orientation-patterned GaAs

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Abstract

We have generated an ultrabroad mid-infrared continuum by using single-pass optical parametric generation (OPG) in orientation-patterned GaAs (OP-GaAs). The spectrum spans more than an octave, from 4.5 to 10.7μm, measured 20 dB down from the peak. The 17.5 mm long, 0.5 mm thick, all-epitaxially-grown OP-GaAs sample with a 166.6-μm quasi-phase-matching period was pumped with 3.13.3μm wavelength, 1 ps pulses up to 2μJ in energy. The OPG threshold was observed at 55 nJ pump energy with the pump polarized along the [111] crystal direction. The slope efficiency near threshold was 51%, and the external conversion efficiency was as high as 15%.

© 2006 Optical Society of America

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