Holographic optical notch reflectors

Details Holographic optical notch reflectors Holographic optical notch reflectors

1990-12-27

1993-03-30

Lerner, Martin

Optical: systems and elements

Holographic system or element

Having particular recording medium

359 15, 359330, 430 1, G02B 532, G02F 139, G03H 102

Patent

active

051989115

ABSTRACT:
A new method for making holographic notch filters in the near infrared spectral region is disclosed. This method utilizes lthe nonlinearity in the response function of holographic materials. When a holographic medium is exposed to two laser beams at different wavelengths, the nonlinearity in the response function causes the formation of notch reflections at wavelengths corresponding to the sum and difference frequencies of the exposing beams. The notch at the difference frequency can be in the NIR region by properly choosing the exposure wavelengths. This method is applicable to holographic filters on both flat and curved substrates.

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