lecture7 - Lecture 7 Interference and interferometers...

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Unformatted text preview: 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 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 Single Slit Experiment Wikipedia Double Slit Diffraction Wikipedia 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) Youngs 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! Youngs Double Slit Experiment Wikipedia Youngs Double Slit Experiment S 1st order maximum: Path length difference S 1 S 2 Youngs Double Slit Experiment...
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This note was uploaded on 02/12/2012 for the course ECE 414 taught by Professor Alenxendra during the Spring '11 term at Purdue University-West Lafayette.

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lecture7 - Lecture 7 Interference and interferometers...

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