The following parameters are known for a semiconductor laser: Emission wavelength λ0 = 0.850 μm. Lasing threshold current Ith = 12 A External quantum efficiency = 1% below threshold External quantum...

The following parameters are known for a semiconductor laser:

Emission wavelength λ0 = 0.850 μm.

Lasing threshold current Ith = 12 A

External quantum efficiency = 1% below threshold

External quantum efficiency = 10% above threshold

(a) Sketch the light output power [W] vs. input current [A] curve for this

device for currents ranging from 0 to 20 A; label the value of the output

power at threshold.

(b) What is the output power [W] for an input current = 18 A?