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Find the optical gain at the threshold of a laser diode having the following parametricvalues R1=R2=0.32,α=10 cm1 and L=500μm.
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Solution:

Optical gain in the laser diode is given by,

Γgth=10+12×(500×104)ln(10.32×0.32)

Γgth =33.7 cm1

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