Precision tunable optical filter

Details Precision tunable optical filter Precision tunable optical filter

1998-01-26

2000-03-21

Spyrou, Cassandra

Optical: systems and elements

Light interference

Produced by coating or lamina

359210, 385 72, G02B 638, G02B 528, G02B 2608

Patent

active

060409444

ABSTRACT:
Tuned optical filters, filter systems, and methods for tuning filters make use of a tilted filter rotated about an oblique axis of a collimating lens or other structure. This rotation varies an angle of incidence of an optical signal directed at the filter at an oblique angle to the axis of rotation. Very fine adjustments of optical filters such as for tuning a first narrow band pass filter to match a center wavelength of another narrow band pass filter, can be provided with small angles between the axis of rotation and a normal to the filter surface, and also between the axis of rotation and the optical path for the incident light. Mechanical adjustment to the filtering frequency is facilitated by making use of a rotational motion about the axis of a GRIN collimating lens.

REFERENCES:
patent: 3387531 (1968-06-01), Hesse
patent: 4861136 (1989-08-01), Stone et al.
patent: 5287214 (1994-02-01), Robertson et al.
patent: 5297155 (1994-03-01), Pan et al.
patent: 5331651 (1994-07-01), Becker et al.
patent: 5416867 (1995-05-01), Thorsten et al.
patent: 5781341 (1998-07-01), Lee
Pamphlet on "Selectraband.TM. Linear Variable Filers."
Wyatt, R. et al. "10 kHz Linewidth 1.5 .mu.m InGaAsP External Cavity Laser With 55 nm Tuning Range," Electronics Letters 19:3 (Feb. 3, 1983), pp. 110-112.

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