Optical amplification is demonstrated in a two-dimensional photonic crystal. Amplification at 1575nm is observed in the direction normal to the plane of periodicity, by pumping the device at 810nm. A gain up to 27dB is measured with moderate pump fluence (50μJ∕cm2). Gain is shown to clamp as laser threshold is attained.
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Raineri et al. (2005) studied this question.
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