Hollow waveguide and method of making same
First Claim
1. A hollow waveguide that causes no significant loss in light having a waveband untransmittable by a quartz optical fiber, said hollow waveguide comprising:
- a tubular member constituting a waveguide; and
a dielectric provided on an inner wall of the tubular member and transparent to a waveband of light to be transmitted, the dielectric being a coating composed mainly of an inorganic compound prepared by heat-treating a metallic compound solution at a high temperature to dry and solidify the coating and heat-decomposing an organic component of the metallic compound solution.
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Accused Products
Abstract
A solution of a metallic compound or a cyclic olefin polymer is introduced into a metallic pipe to deposit the solution onto the whole inner wall of the metallic pipe followed by heat treatment at a high temperature to dry and solidify the solution, thereby forming a dielectric layer. Thus, a metallic hollow waveguide is prepared which comprises a metallic pipe, a dielectric layer provided on the inner wall of the pipe, and a hollow region defined by the inner wall of the dielectric layer. The above constitution makes it possible to provide a highly reliable hollow waveguide which is usable in a broad waveband, for which a quartz optical fiber is unusable, causes no significant transmission loss, can be mass produced, and can be easily produced in a reduced diameter and in an increased length, and to provide a method of making the same.
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Citations
15 Claims
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1. A hollow waveguide that causes no significant loss in light having a waveband untransmittable by a quartz optical fiber, said hollow waveguide comprising:
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a tubular member constituting a waveguide; and a dielectric provided on an inner wall of the tubular member and transparent to a waveband of light to be transmitted, the dielectric being a coating composed mainly of an inorganic compound prepared by heat-treating a metallic compound solution at a high temperature to dry and solidify the coating and heat-decomposing an organic component of the metallic compound solution. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A hollow waveguide for transmitting light having a wavelength of more than about 2 μ
- m, said hollow waveguide comprising;
a tubular member constituting a waveguide; and a dielectric provided on the inner wall of the tubular member, the dielectric comprising a cyclic olefin polymer transparent to a waveband of light to be transmitted. - View Dependent Claims (11)
- m, said hollow waveguide comprising;
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12. A method of making a hollow waveguide, comprising the steps of:
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providing a tubular member for constituting a waveguide; introducing a solution of a dissolved zinc alkoxide into the tubular member to deposit the zinc alkoxide solution onto the whole inner wall of the tubular member; discharging the extra solution from the interior of the tubular member; heat-treating the tubular member at a high temperature while introducing hydrogen sulfide gas into the tubular member and passing the hydrogen sulfide gas through the tubular member; and drying and solidifying the solution, deposited on the whole inner wall region, by the heat treatment at a high temperature to form a dielectric layer of zinc sulfide.
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13. A method of making a hollow waveguide, comprising the steps of:
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providing a tubular member for constituting a waveguide; introducing a solution of a dissolved zinc alkoxide into the tubular member to deposit the zinc alkoxide solution onto the whole inner wall of the tubular member; discharging the extra solution from the interior of the tubular member; heat-treating the tubular member at a high temperature while introducing a hydrogen selenide gas into the tubular member and passing the hydrogen selenide gas through the tubular member; and drying and solidifying the solution, deposited on the whole inner wall region, by the heat treatment at a high temperature to form a dielectric layer of zinc selenide.
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14. A method of making a hollow waveguide, comprising the steps of:
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providing a tubular member for constituting a waveguide; introducing a precursor solution, prepared by mixing zinc chloride with thiourea in an alcohol, into the tubular member to deposit the precursor solution onto the whole inner wall of the tubular member; discharging the extra solution from the interior of the tubular member; heat-treating the tubular member at a high temperature while introducing a gas into the tubular member and passing the gas through the tubular member; and drying and solidifying the solution, deposited on the whole inner wall region, by the heat treatment at a high temperature to form a dielectric layer of zinc sulfide.
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15. A method of making a hollow waveguide, comprising the steps of:
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providing a tubular member for constituting a waveguide; introducing a precursor solution, prepared by mixing zinc chloride with selenourea in an alcohol, into the tubular member to deposit the precursor solution onto the whole inner wall; discharging the extra solution from the interior of the tubular member; heat-treating the tubular member at a high temperature while introducing a gas into the tubular member and passing the gas through the tubular member; and drying and solidifying the solution, deposited on the whole inner wall region, by the heat treatment at a high temperature to form a dielectric layer of zinc selenide.
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Specification