Speckle-free laser probe beam

Ming Lai

doi:10.1117/12.475723

3 July 2003 Speckle-free laser probe beam

Ming Lai

Proceedings Volume 4996, Light-Emitting Diodes: Research, Manufacturing, and Applications VII; (2003) https://doi.org/10.1117/12.475723
Event: Integrated Optoelectronics Devices, 2003, San Jose, CA, United States

Abstract

A speckle free laser probe beam is desirable for applications where a laser probe beam is preferred but laser speckles are troublesome. For example, it is an ideal replacement of laser or SLD probe beam for ophthalmic wavefront instrument that employs a Hartmann-Shack wavefront sensor. The speckle free laser probe beam employs a rotating disk of holographic phase plate in a laser probe beam path to modify the relative phase across the beam and to randomize the modified relative phase rapidly in a time sequence. The holographic phase plate is designed to produce a small but well-defined diffused angle such that the beam quality of the modified probe beam can remain close to diffraction limit. Our experiment shows that spot image with such a modified laser pobe beam is substantially free of speckles. Design considerations and parameters, as well as potential applications, of the speckle free laser probe beam are presented.

Citation Download Citation

Ming Lai "Speckle-free laser probe beam", Proc. SPIE 4996, Light-Emitting Diodes: Research, Manufacturing, and Applications VII, (3 July 2003); https://doi.org/10.1117/12.475723

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KEYWORDS

Laser beam diagnostics

Holography

Speckle

Eye

Retina

Image quality

Laser applications

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