Diffraction grating element

Details Diffraction grating element Diffraction grating element

2006-08-01

2006-08-01

Assaf, Fayez G. (Department: 2872)

Optical: systems and elements

Diffraction

Using fourier transform spatial filtering

C359S569000, C359S576000

Reexamination Certificate

active

07085054

ABSTRACT:
The present invention provides a diffraction grating element that allows the temperature control mechanism to be dispensed with or simplified. The diffraction grating element of the present invention comprises a transparent plate having a first surface and a second surface that are substantially parallel with one another; and a diffraction grating which is formed on a first surface side with respect to the second surface and is substantially parallel with the first surface. At any temperature within a temperature range −20° C. to +80° C., the sum of the rate of change in the period per unit length of the diffraction grating with respect to a temperature change, and the temperature coefficient of the refractive index of a medium that surrounds the diffraction grating element is 0.

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Holm, J., et al., “Fusion Bonded Transmission Gratings for Temperature Compensated DWDM De-Multiplexing” Friday Morning/OFC 2003/vol. 2, pp. 727-728.
Gerritsen. H., et al., “Rectangular Surface-Relief Transmission Gratings with a Very Large First-Order Diffraction Efficiency (-95%) for Unpolarized Light”, Applied Optics, Sep. 1, 1998, vol. 37, No. 25, pp. 5823-5829.
Agilent Technologies “Low PDL 900 Oringinal Holographic Diffraction Gratings”, Jun. 18, 2002.

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