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US 8,570,647 B1Granted
Optical element for transmitting ultraviolet light and light source device including same
AssigneeHon Hai Precision Industry Co., Ltd.
InventorChao-Tsang Wei
Life of this patent
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Abstract
An optical element includes a substrate and a film on the substrate. The substrate made of sapphire. The film is configured for increasing transmission of ultraviolet lights. The film is stacked by a plurality of high refractive index layers and a plurality of low refractive index layers alternately stacked on the substrate.
Claims4
An optical element, comprising:
- a substrate made of sapphire, the substrate comprising a first surface and a second surface opposite to the first surface;
- and
- a film covered on the first surface and configured for increasing transmissivity of ultraviolet lights;
- the film stacked by a first layer and a second layer in an order facing away from the first surface;
- the first layer is one high refractive index layer, the second layer is one low refractive index layer, a material of the high refractive index layer being hafnium oxide (HfO2) having a refractive index from about 2.0 to about 2.15, and a material of the low refractive index layer being magnesium fluoride (MgF2) having a refractive index of about 1.38, a thickness of the first layer is about 70±8 nm, and a thickness of the second layer is about 50±8 nm.
2 more elements
A light source device, comprising:
- an ultraviolet light lamp;
- and
- an optical element holding the ultraviolet light lamp therein, the optical element comprising:
- a substrate made of sapphire, the substrate comprising a first surface and a second surface opposite to the first surface;
- and
- a film covered on the first surface and configured for increasing transmissivity of ultraviolet lights;
- the film stacked by a first layer and a second layer in an order facing away from the first surface;
- the first layer is one high refractive index layer, the second layer is one low refractive index layer, a material of the high refractive index layer being hafnium oxide (HfO2) having a refractive index from about 2.0 to about 2.15, and a material of the low refractive index layer being magnesium fluoride (MgF2) having a refractive index of about 1.38, a thickness of the first layer is about 70±8 nm, and a thickness of the second layer is about 50±8 nm.
5 more elements
Dependencies are inferred from the claim text.