Fizeau interferometer that utilizes a multimode laser as a light source for testing transparent thin-plate samples. As a result of multimode linear laser operation, interference fringes are obtained only when the optical path difference between the reference surface and test surface is equal to twice...http://www.google.fr/patents/US5452088?utm_source=gb-gplus-shareBrevet US5452088 - Multimode-laser interferometric apparatus for eliminating background interference fringes from thin-plate measurements
Multimode-laser interferometric apparatus for eliminating background ...
