AP5: A laser's coherence length is measured with a Michelson interferometer. One arm of the laser is lengthened a distance of 18 cm to make the fringe pattern 'wash out' completely. What is the coherence length and coherence time of the laser?

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AP5: A laser's coherence length is measured with a Michelson interferometer. One arm of the laser is lengthened a
distance of 18 cm to make the fringe pattern 'wash out' completely. What is the coherence length and coherence
time of the laser?
Transcribed Image Text:AP5: A laser's coherence length is measured with a Michelson interferometer. One arm of the laser is lengthened a distance of 18 cm to make the fringe pattern 'wash out' completely. What is the coherence length and coherence time of the laser?
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