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Coherence Length Measurement——Michelson Interferometer |
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Coherence length is an important parameter of measuring the
temporal coherence of an laser. The measuring method is to split
the laser beam in two-way lights. When the two light beams
recombine, they interfere and form interference fringes in the
focal plane. Coherence length is defined as the optical path
difference of the two-way lights when the interference fringes
contrast >50%. |
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Testing Instrument:
Michelson
Interferometer |
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Wavelength range |
200-1100nm；
other wavelengths are available |
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Test
precision |
1mm |
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Maximum
test length |
2m；50m；
other lengths are available |
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Example of Testing Results |
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Interference
fringes |
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