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

lasing threshold condition is 32.78 cm

Step-by-step 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 -
`(1)/(2L)` ln
`(1)/(R^2)` ..........1

put here all value in equation 1 we get

lasing threshold = a -
`(1)/(2L)` ln
`(1)/(R^2)`

lasing threshold = 10 -
`(1)/(2(500*10^(-4))` ln
`(1)/(0.32^2)`

lasing threshold = 32.78

so lasing threshold condition is 32.78 cm