Source considerations for low-coherence speckle interferometry

Itziar Balboa; Ralph P. Tatam

doi:10.1117/12.281175

17 September 1997 Source considerations for low-coherence speckle interferometry

Itziar Balboa, Ralph P. Tatam

Proceedings Volume 3098, Optical Inspection and Micromeasurements II; (1997) https://doi.org/10.1117/12.281175
Event: Lasers and Optics in Manufacturing III, 1997, Munich, Germany

Abstract

A range of sources are investigated to determine their suitability for low coherence speckle interferometry. Sources include a superluminescent diode (SLD), a multimode laser diode (MMLD) and two MMLDs. The coherence lengths for each are determined using a Michelson interferometer and are then compared with those obtained from a speckle interferometer. Two MMLDs at 792nm and 812nm are found to provide a coherence length of 10.2 micrometers comparable with that of the SLD. The dual MMLD source arrangement provides ten to a hundred times greater optical power on the test object making the technique viable for large area test objects.

Citation Download Citation

Itziar Balboa and Ralph P. Tatam "Source considerations for low-coherence speckle interferometry", Proc. SPIE 3098, Optical Inspection and Micromeasurements II, (17 September 1997); https://doi.org/10.1117/12.281175

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