Tunable laser for dynamic measurement

Details Tunable laser for dynamic measurement Tunable laser for dynamic measurement

2005-12-21

2008-10-28

Lyons, Michael A (Department: 2877)

Optics: measuring and testing

By light interference

Using fiber or waveguide interferometer

C356S519000

Reexamination Certificate

active

07443510

ABSTRACT:
A method for monitoring changes in a gap which corresponds to changes in a particular environmental parameter using a tunable laser and interferometer at high frequency is disclosed. The laser light provided to the interferometer is swept through a small range of wavelengths. Light modulated by the interferometer is detected and a non-sinusoidal light intensity output curve is created, a reference point on the curve identified and subsequent sweep of the laser performed. The difference in time, wavelength, or frequency at the occurrence of the reference point between the two sweeps allows for measuring the relative changes in the gap and, as a result, the change in the environmental parameter.

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EPO Search Report, Mar. 27, 2006, Lopushansky et.

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