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what is the formula for coherence length. D f displaystyle Delta f. Spatial Coherence Length x.
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This means that its relative frequency stability is approx 3 10 4 and if its frequency is 12 GHz then its linewidth will be 3 MHz and coherence length 90 metres. L 589 nm and linewidth 51x1011Hz Thus coherence time and length is. Video produced for the on-line course Eagle Eye Astronomy Section 32.
C c t.
Coherence small hence hard to create holograms. L c n D f l 2 n D l displaystyle L c over nDelta f lambda 2 over nDelta lambda where. The transmitting laser has centre wavelength of 1550 nm. And the spatial coherence length 122 lambdads where d is the distance between the light source and the plane where you measures the coherence and S is the radius of your light source.
