The total efficiency of an injection laser with a GaAs active region is $18 \%$. The voltage applied to the device is 2.5 V and the bandgap energy for GaAs is 1.43 eV . Calculate external power efficiency of the device.
Explanation
The external power efficiency of the device is a function of the total efficiency, applied voltage, and threshold voltage. The given values can be used to calculate the external power efficiency using the formula.
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