Abstract
The application of an external dc field enhances greatly the two-wave mixing gain in photorefractive InP:Fe but the heating of the crystal prevents stable operation at high fields. We have strongly reduced the temperature variations by using a Peltier cooling element. By this way, we have observed the influence of the temperature on the gain versus pump intensity curve and we have obtained stabel operation with high gain (6 cm-1, high fields (up to 10 kV/cm) and pump intensities at 1.06 μm as low as 10 mV/cm2.
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