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Summary: Two photon frequency conversion
Gil Porat,1, Yaron Silberberg,2 Ady Arie,1 and Haim Suchowski2
1Department of Physical Electronics, Tel Aviv University, Tel Aviv 69978, Israel
2Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100,
Israel
*gilpor@gmail.com
Abstract: We study the case of two simultaneous three-wave-mixing pro-
cesses, where one frequency is converted to another through an intermediate
frequency. The common assumption is that these processes can occur only
when the material is transparent at all participating frequencies. Here we
show experimentally that, under appropriate conditions, the intermediate
frequency remains dark throughout the interaction. This means that even
if the material is opaque at the intermediate frequency, the conversion will
remain efficient. New possibilities of frequency conversion are therefore
available, e.g. through absorptive bands in the ultraviolet or mid-infrared.
Moreover, though it was hitherto assumed that the phase mismatch value is
governed only by dispersion, we show here that phase matching also de-
pends on light intensity. These findings promise novel all optical switching
techniques.
© 2012 Optical Society of America
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