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# lecture7 - Lecture 7 Interference and interferometers...

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Lecture 7 Interference and interferometers Effect of amplitudes Effect of frequencies and phases Effect of coherence Wavefront splitting interferometers Amplitude splitting interferometers Chapter 2 Interference

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Diffraction Wikipedia When a wave encounters an obstacle: Bending of waves around small obstacles Spreading out of waves past small openings Flat wave hits a slit New wave front bulges out from the slit Light is diverged around the edges of the slit
Single Slit Diffraction Wikipedia

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Single Slit Experiment Wikipedia
Double Slit Diffraction Wikipedia

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Diffraction Wikipedia Pronounced diffraction: Wavelength is on the order of the size of the diffracting objects Complex pattern of varying intensity: Results of superposition, or interference (different parts of a wave travel by different paths)
Conditions for Interference Optical interference: Interaction of two or more light waves which yield a resulting flux that is different from the scalar sum of the component fluxes Conditions: The sources must be coherent (i.e., they must maintain a constant phase relationship with one another) The sources must be monochromatic (i.e., of a single Wavelength/frequency) The linear superposition principle is applicable (same polarization)

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Young’s Double Slit Experiment http://psi.phys.wits.ac.za/teaching/Connell Thomas Young: "Experiments and Calculations Relative to Physical Optics," 1803 Sunlight: no spatial coherence (for proper illumination of two slits) Source: spatially coherent beam!
Young’s Double Slit Experiment Wikipedia

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Young’s Double Slit Experiment S 1st order maximum: Path length difference S 1 S 2
Young’s Double Slit Experiment

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1 V 1 V Superposition of two voltages of equal amplitudes
1 V 0.5 V Superposition of two voltages of different amplitudes

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1 V 0.1 V Superposition of two voltages of different amplitudes
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lecture7 - Lecture 7 Interference and interferometers...

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