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型號 CA-1300
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CA-1300
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Educational Objectives

l   He-Ne Laser

l   Contrast Function

l   Coherence Length

l   Two Beam Interference

l   Homodyne Interferometer

l   Fringe Detection, Counting andInterpolation

l   Definition of Length

The basic version of a Michelson interferometer is used to teach thehandling, alignment, and measurement of a homodyne interferometer system. By interferingtwo laser beams, fundamental properties of Gaussian beams as well as wavefronts and interference patterns are demonstrated and investigated. With oneinterferometer mirror on a mechanical rack and pinion drive the beam pathdifference can be varied and hence the interferometer contrast function can beprobed. The measurement of coherence length of the He-Ne laser introduces thestudent to the spectral emission bandwidth of the laser source.