Question

4. A laser beam from a 1 mW He-Ne laser (632.8 nm) is directed onto a parallel film with an incident angle of 45°. Assume a beam diameter of 1 mm and a film index of 1.414. (See Figure below) Determine (a) The amplitude of the E-vector of the incident beam. (b) The angle of refraction of the laser beam into the film (c) The magnitudes of r' and tt', using the Stokes relations and a reflection coefficient, r 0.280. (d) The independent amplitudes of the first 2 transmitted beams (e) The minimum thickness of film that would lead to total cancellation of the reflected beams when they are brought together at a point by a lens. 1 mm ol Laser beam X F n1414 Film

Answer 1

Giemlegimiden 4r .414 nde Ee