Question

For a GaAs, the Fresnel reflection coefficients for uncoated facets are 0.32 and a 10 cm. Determine the lasing threshold condition for a laser diode of length 500 pum

Answer 1

Answer:

lasing threshold condition is 32.78 cm

Explanation:

given data

uncoated facets R = 0.32

a =  10 cm

length L = 500 um = $500*10^{-4}$ m

to find out

lasing threshold condition

solution

we know lasing threshold condition formula that is

lasing threshold  = a - $\frac{1}{2L}$ ln  $\frac{1}{R^2}$ ..........1

put here all value in equation 1 we get

lasing threshold  = a - $\frac{1}{2L}$ ln  $\frac{1}{R^2}$

lasing threshold  = 10 - $\frac{1}{2(500*10^{-4}}$ ln  $\frac{1}{0.32^2}$

lasing threshold  = 32.78

so lasing threshold condition is 32.78 cm