Optical filter

Details Optical filter Optical filter

2008-03-24

2011-10-25

Pritchett, Joshua L (Department: 2872)

Optical: systems and elements

Light interference

Produced by coating or lamina

C359S582000

Reexamination Certificate

active

08045269

ABSTRACT:
An optical filter has a multilayer thin film comprising first to i-th layers stacked in alternate layers of high and low refractive indices on a transparent substrate. Respective odd-numbered layers (high refractive index layers) and respective even-numbered layers (low refractive index layers) form repetitive sequences of layers each of which cyclically changes in optical thickness throughout the multilayer thin film. Each of k-th from-the-bottom alternate layers of high and low refractive indices has such an optical thicknesses as meet the following conditional expressions (1) and (2), concurrently:in-line-formulae description="In-line Formulae" end="lead"?n×d=(.c/4)×[1+sin{(k−1)×.}×.]  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0 . . . <1   (2)in-line-formulae description="In-line Formulae" end="tail"?where.c is the center wavelength of reflection band,n is the refraction index of the layer for the d-line,d is the physical thickness of the layer,. is a factor of a pitch angle represented by 2./the number of layers a one layer-stack,. is the rate of amplitude.

REFERENCES:
patent: 5400174 (1995-03-01), Pagis et al.
patent: 7564628 (2009-07-01), Barth et al.
patent: 2002/0071075 (2002-06-01), Ogino et al.
patent: 2003/0002157 (2003-01-01), Someno
patent: 2002-333519 (2002-11-01), None
“Thin-Film Optical Filters”, H. A. Macleod, B.Sc., A.Inst.P., Instrument Development Manager, Adam Hilger Ltd: London, pp. 116-117, 1969.

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