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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1993),
  • paper CFI5

High-dynamic range, fluence-dependent GaP optical limiter for eye protection

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Abstract

Nonlinear optical phenomena in a variety of materials are currently under investigation for use in optical limiting devices for eye protection. Although several materials and configurations have been used in "proof-of-principle” demonstrations, to date the performance of all such systems falls well short of that necessary for a practical device, because of inadequate dynamic range, field of view, bandwidth, and similar problems. Any practical device designed for eye protection must possess a high linear transmission throughout a significant portion of the visible spectrum, but must rapidly switch to a low transmission state for intense input radiation. Furthermore, for pulsed inputs, it is desirable to limit the output fluence of the device to less than 0.5 μJ/cm2 over a significant range of input fluences. This implies that tire device must switch to the low transmission state at extremely low input fluences, and it should exhibit a wide dynamic range. The device should also have a wide field of view, which dictates a low f-number optical system. Finally, since one is not likely to have a prior knowledge of the temporal nature of the input pulse, it should function for a wide range of input pulse durations. This indicates that fluence dependent processes in the nonlinear material are preferable to irradiance dependent processes.

© 1993 Optical Society of America

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