Optical filtering apparatus

Details Optical filtering apparatus Optical filtering apparatus

1984-11-06

1987-06-02

Corbin, John K.

35016223, 350313, G02B 532, G02B 518, G02B 522

Patent

active

046698116

ABSTRACT:
A well defined passband for an optical reflection filter is achieved by causing light to be reflected at least twice from a holographic wavelength selective reflector. Preferably the wavelength/reflectivity characteristics differ at the two reflections to give relatively shifted, but overlapping, spectral passbands. The apparatus may comprise a fibre optic input cable which directs light at the holographic reflector and a corner cube reflector which returns the reflected light for a second reflection prior to receipt by a detector.

REFERENCES:
patent: 2881663 (1959-04-01), Dearborn
patent: 3675990 (1972-07-01), Kogelnik et al.
patent: 4208637 (1980-06-01), Matsuda et al.

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