Abstract
Laser beam measurement instruments have long been available for visible laser beams, but there is a growing need for such instruments in the near IR. This is especially true for the 1 - 1.7 micrometer region that is used for communication lasers. While a few cameras have been developed for this region, there are currently no instruments for measuring laser beam phase that operate in this regime. We have begun the development of an infrared wavefront sensor based on the Shack-Hartmann principal using an InGaAs IR camera. With this method, the laser beam is dissected into a number of focal spots, which are projected onto a detector. The focal spot position is related to the local wavefront slope. Through appropriate analysis, the laser beam intensity and phase distribution can be obtained.© (1998) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
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