Wideband dichroic-filter design for LED-phosphor beam-combining

Optical: systems and elements – Light interference – Produced by coating or lamina

Reexamination Certificate

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C359S586000

Reexamination Certificate

active

07859754

ABSTRACT:
A general method is disclosed of designing two-component dichroic short-pass filters operable for incidence angle distributions over the 0-30° range, and specific preferred embodiments are listed. The method is based on computer optimization algorithms for an N-layer design, specifically the N-dimensional conjugate-gradient minimization of a merit function based on difference from a target transmission spectrum, as well as subsequent cycles of needle synthesis for increasing N. A key feature of the method is the initial filter design, upon which the algorithm proceeds to iterate successive design candidates with smaller merit functions. This initial design, with high-index material H and low-index L, is (0.75 H, 0.5 L, 0.75 H)^m, denoting m (20-30) repetitions of a three-layer motif, giving rise to a filter with N=2 m+1.

REFERENCES:
patent: 4770496 (1988-09-01), Mahlein
patent: 4896928 (1990-01-01), Perilloux et al.
patent: 5999321 (1999-12-01), Bradley
patent: 7068430 (2006-06-01), Clarke et al.
Semrock Quality Optical Filters 2007-2008 Catalog, p. 37.
https://www.omegafilters.com/index.php?page=tech—fd—ap, site visited Oct. 10, 2007.

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