Broadband cavity spectrometer apparatus and method for...

Details Broadband cavity spectrometer apparatus and method for... Broadband cavity spectrometer apparatus and method for...

2007-10-30

2007-10-30

Connolly, Patrick (Department: 2877)

Optics: measuring and testing

By light interference

Spectroscopy

C356S506000

Reexamination Certificate

active

11250954

ABSTRACT:
A broadband light source with a sufficiently long coherence length is impinged on the optical cavity. The broadband laser light reflects from the first and second surfaces of the cavity. The two light beams, either reflected or transmitted, are phase shifted from one another by an amount proportional to the optical path length of the cavity and inversely proportional to the wavelength of the light (4πnd/λ) The two light beams interfere with each other and form a modulated light beam that has a spectrum approximately like the laser's broadband spectrum multiplied by a cosine with a frequency 4πnd/λ. The modulated light beam is coupled to a spectrometer that measures the intensity of the light as a function of wavelength over a range of wavelengths. The Fourier transform of the spectrum contains a peak that is related to the OPL and is located at 2*n*d where n*d is the OPL.

REFERENCES:
patent: 5483341 (1996-01-01), Naganuma
patent: 6359692 (2002-03-01), Groot
patent: 2002/0109851 (2002-08-01), Deck
patent: 2003/0137671 (2003-07-01), De Groot et al.
patent: 2003/0160968 (2003-08-01), Deck
patent: 2005/0213870 (2005-09-01), Kersey et al.
patent: 2007/0006663 (2007-01-01), Zerwekh et al.

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