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Topics. Young’s double slit experiment with laser light: Determine the wavelength of the laser light. The double slit experiment with white light: Determine the coherence length of white light. Interference and Coherence Length.

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  1. Topics • Young’s double slit experiment with laser light: Determine the wavelength of the laser light. • The double slit experiment with white light: Determine the coherence length of white light.

  2. Interference and Coherence Length • The path length difference must be less than the coherence length of the light. Otherwise no definite phase relationship exists and the interference pattern is not visible. • No problem for laser light (coherence length of order or meters). • White light has much shorter coherence length  Interference pattern only visible for small m.

  3. V I.A. Young’s Double Slit Experiment with Laser Light Screen Large Screen (to keep laser light within your area) Double Slit Laser • Vary slit separation and observe changes. • Measure interference maxima spacing and determine the wavelength of the laser from it.

  4. V I.B Young’s Double Slit Experiment with White Light Diffuser Double Slit Incandescent Light • The double slit interference pattern (if there) will appear when looking against the direction of light propagation through the diffuser. • Try different slit widths. • Estimate coherence length of white light.

  5. V I.B Young’s Double Slit Experiment with White Light Diffuser Double Slit Photometer aperture Incandescent Light • Use the photometer aperture to only let light through one slit. • Observe and explain.

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