Diffraction grating

Details Diffraction grating Diffraction grating

1994-01-18

1997-05-13

Berman, Susan W.

Optical: systems and elements

Diffraction

From grating

522 96, 522 97, G02B 518, C08L 7514, C08L 7516

Patent

active

056298048

ABSTRACT:
A diffraction grating is constituted by a substrate and a resin layer having a repetitive pattern formed on the substrate. The resin layer is characterized by showing a Young's modulus at 100.degree. C. which is at least 2% of that at 20.degree. C. The resin layer may be obtained by curing a photocurable resin composition, including: (A) a polyfunctional urethane-modified polyester (meth)acrylate comprising a polyester oligomer and a plurality of (meth)cryloyl groups bonded to the polyester oligomer via a urethane group, and having a number-average molecular weight of at least 700, (B) a polyfunctional (meth)acrylate having a number-average molecular weight of less than 700, (C) a monofunctional (meth)acrylate, and (D) a photopolymerization initiator.

REFERENCES:
patent: 4235654 (1980-11-01), Dohi et al.
patent: 4576850 (1986-03-01), Martens
patent: 5138604 (1992-08-01), Umeda et al.
patent: 5175030 (1992-12-01), Lu et al.
patent: 5296949 (1994-03-01), Pennace

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