University:
Santa Fe College
Course:
ETS 2527C | Electromechanical Components and Mechanisms
Academic year:

2024
Views:

205

Pages:

5
Author:

Jabin F.

quarter wave plate (λ/4 plate):- λ/4 plate is made from doubly refracting crystal and it is used to produce (path diff.) or π/2 (phase diff.) b/w. E-wave and o-wave. Phase diff. (Δφ) = 2π/λ × path diff. = 2π/λ × λ/4 = (π/2) speed of E-wave Ve = c/ne speed of o-wave Vo = c/no ne = refractive index for E-wave. no = refractive index for o-wave. Optical path diff. b/w E-wave and o-wave-> = |(net) - (not)| modes because sometimes ne > no or ne < no net - not = λ/4 => t = λ/4|me - no| λ = wave length of incident wave in free space. x y optics axis along x-axis. Ee = E cosθ E₀ = E sinθ amplitude will be same if θ = 45°, 135°, 225°, 315° then olp wave will be Circularly polarized. for θ = 30°, 60°, --- then amplitude is not same so wave will be Elliptically P. for θ = 0°, 90°, 180°, --- then superposition will not possible so outcomes will be Plane Polarized. # P.P. λ/4 plate θ=0°, 90°, 180°, 270° -> P.P. P.P. λy plate θ= 45°, 135°, 225°, 315° -> C.P. P.P. Any plate θ≠ 0°, 90°, 180°, 270° -> E.P. U.P. -> U.P. λ/4 plate U.P. -> P.P. -> P.P. Polarizers N/4 plate O-dependence C.P. -> P.P. λ/4 plate 1/2 phase diff. has already π/2 phase + E.P. -> P.P. Δφ=90° E₀₁ ≠ E₀₂