What
is the definition of the external quantum efficiency of a semiconductor laser?

Question

Answer

The ratio of the number of photons emitted to the number of photons absorbed

Answer

The ratio of the number of electron-hole pairs generated to the number of
photons emitted

Answer

The ratio of the number of photons emitted to the number of photons emitted
outside the device

Answer

The ratio of the number of photons emitted to the number of electron-hole
pairs generated

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