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On the measurement of absolute radiative and non-radiative recombination efficiencies in semiconductor lasers

Absolute measurements of radiative quantum efficiencies are very difficult. The authors show theoretically that a relative or uncalibrated measurement of radiative efficiency against a variable such as excitation rate, together with an uncalibrated measurement of the non-radiative efficiency against the same variable, can be combined to yield the absolute values of the quantum efficiencies. Acoustic techniques are suggested to obtain the relative or uncalibrated non-radiative recombination rate.