Frustrated total internal reflection optical power limiter

Details Frustrated total internal reflection optical power limiter Frustrated total internal reflection optical power limiter

1984-09-05

1996-10-01

Moskowitz, Nelson

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 39, 359 69, 359 94, 359886, G02F 1133

Patent

active

055615414

ABSTRACT:
In order to protect a delicate photodetector from high-intensity radiation, such as from a laser, a device for limiting optical power to the detector is interposed between the radiation and the detector. This device has an optical interface that totally reflects high-intensity radiation, but which freely transmits normal (low intensity) radiation to the detector. The interface is between two optical materials, one with a linear index of refraction with respect to radiation intensity, and the other with a non-linear index. At low intensity radiation levels, the two materials have the same indices of refraction, and such radiation is freely transmitted through the interface, but with high-intensity radiation, a mismatch of indices of refraction allows total reflection at the interface.

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