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The gain measurement of a semiconductor Raman amplifier with a GaP-AlGap waveguide structure pumped by a high-intensity pulse source has been measured for use as a basis for the time gate amplification of light. A gain of 10dB has been obtained for a 5mm long waveguide with a back reflector. The gain measurement has also been performed for a waveguide which has both faces antireflection coated. From this measurement, it is confirmed that the gain is principally from backward scattering rather than from forward scattering. It is shown that the dominance of backward scattering limits the minimum gate time for the time gate amplification of light.
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Saito et al. (1999) studied this question.
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