Source modulation for phase shifting in static and dynamic speckle shearing interferometry

J.-R. Huang; Helen D. Ford; Ralph P. Tatam

doi:10.1117/12.276315

17 July 1996 Source modulation for phase shifting in static and dynamic speckle shearing interferometry

J.-R. Huang, Helen D. Ford, Ralph P. Tatam

Proceedings Volume 2860, Laser Interferometry VIII: Techniques and Analysis; (1996) https://doi.org/10.1117/12.276315
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

Direct injection-current modulation of a diode laser source is demonstrated for phase-stepping, heterodyning and stroboscopic illumination in a shearing interferometer. The techniques are proposed as an alternative to the use of mechanical phase-shifters such as piezoelectric transducers, offering the advantages of ease of implementation, extended measurement bandwidth and elimination of active elements from the measurement head. The phase-stepping and heterodyning techniques require the interferometer to be unbalanced, which introduces an unwanted magnification mismatch into the shearing interferometer. A compensation technique using a block of high refractive-index material is described, and experimental demonstrations of each of the three techniques are presented.

Citation Download Citation

J.-R. Huang, Helen D. Ford, and Ralph P. Tatam "Source modulation for phase shifting in static and dynamic speckle shearing interferometry", Proc. SPIE 2860, Laser Interferometry VIII: Techniques and Analysis, (17 July 1996); https://doi.org/10.1117/12.276315

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