Laser interferometer

Details Laser interferometer Laser interferometer

G - Physics

01

B

33/49

G01B 9/02 (2006.01) G01B 11/02 (2006.01) G01B 11/06 (2006.01) G01N 21/45 (2006.01)

Patent

CA 1163797

ABSTRACT A multiple frequency laser interference microscope in which a source of coherent laser light containing at least two frequencies of light is used in conjunction with a trans- mitted light polarizing microscope so as to provide an inter- ference microscope. Using a wide fringe mode of operation refractive index becomes directly visible as shades and hues of different colours, and discontinuities and gradients of less than 0.001 may be detected. Using a narrow fringe mode of operation, measurement of fringe shift and thickness permit exact and rapid calculation of refractive index to 0.00n at least.

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