Automated precision wavelength control for fiber optic Bragg gra

Details Automated precision wavelength control for fiber optic Bragg gra Automated precision wavelength control for fiber optic Bragg gra

1997-06-09

2000-07-25

Allen, Stephone B.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

385123, G02B 610

Patent

active

060939273

ABSTRACT:
The present invention provides a computer controlled apparatus and method for producing high quality fiber optic Bragg gratings. According to the invention, the apparatus (10) preferably includes a laser (12) for generating an ultraviolet beam (18), a rotatable prism (32) disposed downstream of the laser (12) for receiving the beam (18) and an optical fiber (48) disposed adjacent a bottom edge (84) of the prism (32) for receiving a high fringe frequency interferrogram (86) formed by the prism (32). The prism (32) is coupled to a rotation stage (14) for rotating the prism (32) about a pre-selected pivot point (36) relative to the angle of incidence of the beam (18) to vary the Bragg wavelength at the fiber core.

REFERENCES:
patent: 5327515 (1994-07-01), Anderson et al.
patent: 5388173 (1995-02-01), Glenn
patent: 5563967 (1996-10-01), Haake
"Fiberoptic Sensors measure up for Smart Structures", Friebele et al., Laser Focus World, May 1994, pp. 165-169.

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