Abstract
We report on photorefractive two-beam coupling in proton-implanted Fe-doped waveguides at wavelengths from 632.8 to 1550 nm. Exponential gain coefficients of 11 and 0.9 were measured at wavelengths of 632.8 nm and 1550 nm, respectively. Photorefractive response times as low as 120 µs are reported at 632.8 nm for a pump power of 4 mW. It is shown that proton irradiation increases the effective trap density, decreases the response time, and extends the photorefractive sensitivity of Fe-doped crystals toward near-infrared wavelengths.
© 1996 Optical Society of America
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