Apparatus and method for providing a feedback measurement in a l

Details Apparatus and method for providing a feedback measurement in a l Apparatus and method for providing a feedback measurement in a l

1994-04-12

1995-11-28

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

356352, G01B 902

Patent

active

054713005

ABSTRACT:
The feedback in a laser system is measured in near real time by inducing a frequency shift and the feedback being based on the phase shift undergone by the feedback beam in an external cavity. The frequency shift is induced by phase modulating the feedback beam, for example by varying the position of an optical element placed in the feedback beam upon applying a ramp signal to the optical element. Frequency is detected by a Fabry-Perot interferometer which generates an interference fringe pattern, the intensity of the central fringe being detected to determine the induced frequency shift in real time, the amount of feedback being proportional to the time of flight multiplied by the frequency shift.

REFERENCES:
patent: 4195931 (1980-04-01), Hara
patent: 4786124 (1988-11-01), Stone et al.
patent: 4865450 (1989-09-01), Munechika et al.
patent: 4907237 (1990-03-01), Dahmani et al.
patent: 4979178 (1990-12-01), Beausoleil et al.
patent: 5003546 (1991-03-01), Lidgard et al.
patent: 5020062 (1991-05-01), Cusack, Jr. et al.
patent: 5027435 (1991-06-01), Chraplyvy et al.
patent: 5132979 (1992-07-01), Erbert
patent: 5185675 (1993-02-01), Banks
patent: 5268738 (1993-12-01), Baney et al.
G. A. Acket et al., "The Influence of Feedback Intensity on Longitudinal Mode Properties and Optical Noise in Index-Guided Semiconductor Lasers," IEEE Journal of Quantum Electronics, vol. QE-20, No. 10, Oct. 1984, pp. 1163-1169.

Affiliated with

Also associated with

Rating

Apparatus and method for providing a feedback measurement in a l does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus and method for providing a feedback measurement in a l, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for providing a feedback measurement in a l will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2017139