Wideband dichroic-filter design for LED-phosphor beam-combining
A general method is disclosed of designing two-component dichroic short-pass filters operable for incidence angle distributions over the 0-30.degree. 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.
- Research Organization:
- Light Prescriptions Innovators, LLC, Altadena, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- FC26-05NT42341
- Assignee:
- Light Prescriptions Innovators, LLC (Altadena, CA)
- Patent Number(s):
- 7,859,754
- Application Number:
- 11/982,492
- OSTI ID:
- 1176419
- Resource Relation:
- Patent File Date: 2007 Nov 02
- Country of Publication:
- United States
- Language:
- English
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