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A thick layer of GaAs, which can be treated as three-dimensional, is pumped in such a way that

1077_0c6e7e1a-384d-4581-aaa1-f41a496f3a98.png at the band gap. Sketch the optical gain as a function of frequency g(ω) and estimate its maximum. The high values of optical gain that can be achieved with semiconductor lasers are another ingredient in their success.

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