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Unformatted text preview: time, if their light has a phase relationship that does not change with time: E ( t )= E cos( ϖ t + φ ). Coherent sources : Phase must be well defined and constant. When waves from coherent sources meet, stable interference can occur. Sunlight is coherent over a short length and time range. Since laser light is produced by cooperative behavior of atoms, it is coherent of long length and time ranges. Incoherent sources : jitters randomly in time, no stable interference occurs, Intensity in DoubleSlit Interference ( 29 1 2 sin and sin E E t E E t ϖ φ = = + E 1 E 2 2 1 2 4 cos I I = 2 sin d π θ λ = ( 29 ( 29 1 1 1 2 2 2 Minima when: sin for 0,1,2, (minima) m d m m = +2 = + = K 1 2 2 Maxima when: for 0,1,2, 2 sin sin for 0,1,2, (maxima) d m m m d m m = =2 = = = = K K avg 2 I I =...
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 Spring '08
 Goksu
 Physics, Diffraction, Light, Sin, coherent, Thomas Young

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