Wavelength-independent interferometer for optical signal process

Details Wavelength-independent interferometer for optical signal process Wavelength-independent interferometer for optical signal process

1989-09-21

1991-02-12

Willis, Davis L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01B 902

Patent

active

049919636

ABSTRACT:
A wavelength-independent-interferometer comprises means to receive light (10) from a field of view, means (BS1) to separate the light into two beams (11, 12), means (BS2) to combine the two beams, and dispersive means (30) interposed in the path (12) of one of the two beams to produce a wavelength-dependent shear. The dispersive means may be a transmission diffraction grating or a reflection grating. In the arrangement shown the optical elements are combined in a modified Mach-Zehnder interferometer. When the conventional Mach-Zehnder interferometer is illuminated with coherent light the separation of interference fringes produced in the interference plane is inversely proportional to the wavelength. By introducing a dispersive element in the invention the detector is sensitized to a pre-determined fringe separation. A moveable reticle is placed in front of a detector to sensitize the detector to the fringe pattern.

REFERENCES:
Hariharan et al., "Achromatic Fringes Formed in a Triangular Path Interferometer" JOSA, vol. 49, pp. 732-733, Jul. 1959.

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