Optical coating for reflecting visible and longer wavelength rad

Details Optical coating for reflecting visible and longer wavelength rad Optical coating for reflecting visible and longer wavelength rad

1992-10-13

1994-07-26

Ben, Loha

Optical: systems and elements

Light interference

Produced by coating or lamina

359588, 359589, 385125, 428156, 428163, G02B 110, G02B 528, G02B 600, B32B 300

Patent

active

053330900

ABSTRACT:
A coated reflector reflective of radiation having two different wavelengths over a wide range of incidence angles, including grazing incidence angles. The coated reflector can be employed in a waveguide for laser radiation useful for medical or other applications, such as a combined HeNe and CO.sub.2 laser beam. Preferably, the coated reflector includes a metal substrate and a multi-layer stack thereon, the multi-layer stack consists of alternating dielectric layers of high and low refractive index material, each pair of adjacent high and low index layers of the stack has a combined matched optical thickness substantially equal to an incident short (e.g., visible) wavelength multiplied by a factor M/2, and the total matched optical thickness of the stack is substantially equal to (2N-1).lambda..sub.L /8, where M and N are positive integers and .lambda..sub.L is an incident long wavelength (such as the wavelength of a CO.sub.2 laser beam). Preferably, the substrate is silver, the high index dielectric is zinc sulfide, and the low index dielectric is yttrium fluoride or cerium fluoride. In other embodiments, the invention is a coated substrate having substantially parallel indentations along which it can be folded into a polygonal shape for use a waveguide.

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Design of Optimum High-Reflectivity Coatings for Grazing Angles of Incidence, Shellan, J. of the Optical Society of America, vol. 2, No. 7, Jul. 1985, pp. 1057-1065.

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