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WAVEPLATES PLATE RETARDERS

WAVEPLATES PLATE RETARDERS. Waveplate (Retarders). A wave plate or retarder is an optical device that alters the polarization state of a light wave traveling through it. Full Wave Plate Half Wave Plate Quarter Wave Plate. Optical path length. Phase difference.

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WAVEPLATES PLATE RETARDERS

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  1. WAVEPLATES PLATE RETARDERS

  2. Waveplate (Retarders) A wave plate or retarder is an optical device that alters the polarization state of a light wave traveling through it. • Full Wave Plate • Half Wave Plate • Quarter Wave Plate

  3. Optical path length Phase difference

  4. Quarter wave, Half waveandFull wave

  5. Half-Wave Plate

  6. Insert a λ/4 plate with axis at 45° to the input polarization Insert a λ/4 plate with axis at 45° to the desired output polarization. Insert a λ/2 plate – orientation unimportant. Insert a λ/2 plate with axis at ½ the desired rotation.

  7. Interference of polarized light Fresnel-Arago laws • Two coherent rays polarised • at right angles do not interfere 2. Two parallel coherent polarised rays will interfere in the same way as will ordinary light

  8. Optical Activity

  9. The two hands are "non-superimposable mirror images".

  10. An optically active compound and its mirror image are called enantiomers or optical isomers

  11. Optically active medium

  12. Polarimetry

  13. Sugar, Glucose and Fructose Specific rotation Sugar (Sucrose or Cane sugar) o 66.47 Glucose-D ( Dextrose or Grape sugar) o 52.7 Fructose (Levulose or Fruit sugar) o - 92

  14. Half Shade plate Q Q´ E´E f f A O´ O

  15. Antiglare screen Polarizing Sunglass

  16. Problem • Unpolarized light of intensity I0 is incident normally on three • polaroid sheets P1, P2 and P3 all arranged in series. The pass • axis of each polaroid sheet makes an angle of 450 with the • earlier sheet. • What is the intensity of the transmitted beam? • What is the intensity of the transmitted beam if the Polaroid • sheet P2 is replaced with a quarter wave plate Q2 with its • optic axis along the pass axis of P2?

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