Interferometry using binary holograms without high order diffraction effects |
| |
Authors: | Boruah Bosanta R Love Gordon D Neil Mark A A |
| |
Affiliation: | Department of Physics, Indian Institute of Technology Guwahati, Guwahati-39, Assam, India. brboruah@iitg.ernet.in |
| |
Abstract: | We describe a technique for a phase-stepping interferometer based on programmable binary phase holograms, particularly useful for optical testing of aspheric or free-form surfaces. It is well-known that binary holograms can be used to generate reference surfaces for interferometry, but a major problem is that cross talk from higher diffraction orders and aliasing can reduce the fidelity of the system. Here, we propose a new encoding technique which improves the accuracy of the technique and demonstrate its implementation using a binary liquid crystal spatial light modulator. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|