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UMD
PHYS 375 -
The CD Player
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The CD PlayerSlide Number 2Digital Encoding into BumpsRefraction and DiffractionReadout: InterferenceTracking - uses diffractionTracking - uses polarizationSlide Number 8Slide Number 9Slide Number 10The CD Player• uses refraction• uses diffraction• uses interference• uses polarizationDigital Encoding into BumpsRefraction and DiffractionLaser beampitlandReadout: InterferenceOr Scattering?λ= 780 nmn = 1.55Pit height = 125 nm(λ/n)/4 = 125 nmThe pit acts as asub-wavelengthscattererTracking - uses diffractionTracking - uses
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