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# Azer intensity e2 electricity magnesm lecture 24

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Unformatted text preview: x E y I1 60o E3 λ/4 I2 = I1 I3 = ½ I1 z What is the intensity I3 of the light aZer the 60o polarizer? A) I3 = I1 Ey E3 B) I3 = ½ I1 C) I3 = ¼ I1 3 NOTE: This does not depend on θ ! 60o Ex Electricity & Magne/sm Lecture 24, Slide 26 Follow-Up 1 Replace the 60o polarizer with another QWP as shown. fast 45o y RCP E x w slo E xE y slow fast I1 λ/4 I2 = I1 E3 Ey I3 Ex z What is the polariza/on of the light aZer the last QWP? y y A) LCP B) RCP C) D) x E) un ­polarized x Easiest way: Efast is λ/4 ahead of Eslow Brings Ex and Ey back in phase! Electricity & Magne/sm Lecture 24, Slide 27 Follow-Up 2 Replace the 60o polarizer with another QWP as shown. fast 45o y E x RCP w slo E xE y slow fast I1 E3 Ey Ex I3 = I1 z λ/4 I2 = I1 What is the intensity I3 of the light aZer the last QWP? A) I1 Before: B) ½ I1 C) ¼ I1 No absorp/on: Just a phase change! AZer: Intensity = 〈E2〉 Electricity & Magne/sm Lecture 24, Slide 28 Follow-Up 3 Consider light incident on two linear polarizers as shown. Suppose I2 = 1/8 I0 y E1 x 60o I0 E2 I1 I1 = ½ I0 I2 = 1/8 I0 z What is the possible polariza/on of the input light? A) LCP AZer ﬁrst polarizer: LP along y−axis with intensity I1 B) 45o C) un ­polarized AZer second polarizer: LP at 60o wrt y−axis Intensity: I...
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