Question

Angle of incidence = 45 degrees.

Index of refraction= 2.4

If the initial irradiance of the laser is 2L0. And if the half of the laser light is parallel and half is perpendicular, (Lo perpendicular = Lo, Lo parallel = Lo). What is the irradiance of each component (I Perpendicular and I Parallel) after the two rflections ?. (The answer should not be the same kind of reflection.)

Answer 1

Use Fresnel's coefficient for reflection for S and P polarized light.

Also, using Snell's law, the angle of transmission will be:

=>

so, the fraction of light which gets reflected for perpendicular polarized light [s-polarized] will be:

=>

so, after two reflections with the same angle of incidence, the final irradiance will be:

= 7.81%.

and for Parallel Polarization [p-polarized]

=>

after two reflections, this will become,

both of them will suffer a phase shift of from each reflection.