Gradient-index lens and composite optical element utilizing the same
A technology of refractive index distribution and optical elements, applied in the fields of optical circuits, optical integrated circuits, and composite optical elements, can solve problems such as manufacturing difficulties and limitations of optical characteristics of optical elements, and achieves suppression of sub-focus, suppression of multiplexing, and improvement of light concentrating. sexual effect
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Embodiment 1
[0076] Hereinafter, an example of a thin touch lens in which a multilayer film is formed on a substrate and an element using the same will be described with reference to the drawings.
[0077] FIG. 1 is a diagram showing the shape and size of an optical element of the first embodiment, and FIG. 2 is a diagram showing a refractive index distribution. The refractive index is designed so as to form a step-like distribution approximating Equation 1.
[0078] This optical element is produced from an organic-inorganic composite synthesized in the following procedure.
[0079] (1) Preparation of hydrolysis polycondensation solution of metal alkoxide
[0080] Solution A
[0081] 3-methacryloxypropyltriethoxysilane (hereinafter referred to as MPTES): 13.2g
[0082] Ethanol: 14.2g
[0083] Hydrochloric acid (2N): 1.35g
[0084] The above-mentioned raw materials were mixed, and after standing at 30°C for 45 hours, the ethanol (solvent) was removed by heating at 90°C for 40 minutes i...
Embodiment 2
[0110] FIG. 4 is a diagram showing the shape and size of a distributed refractive index lens according to the second embodiment, and FIG. 5 is a diagram showing a distribution of refractive index. The refractive index is designed so that the distribution approximated by the stepwise expression 2-1 is formed in the center of the element, and the distribution by the stepwise approximate expression 2-2 is formed in the peripheral portion.
[0111] In Example 2, the same material as in Example 1 was used, and the thickness of each layer was as follows.
[0112] 1st to 4th layers and 17th to 20th layers: 11 μm
[0113] Layer 5 and 16: 10 μm
[0114] Layer 6 and 15: 16 μm
[0115] In the distributed refractive index lens of the present example produced in this way, the light from the HeNe laser is incident on the surface 1 as in the first example. The light intensity distribution in the thickness direction in this embodiment is shown in FIG. 6 . The half-spectrum amplitude (full...
Embodiment 3
[0119] Fig. 7 is a diagram showing the shape of a distributed refractive index lens according to a third embodiment. In the above figure, the curvature of the surface 2 is 0.697, and the external dimension is the same as that of the embodiment 1. The horizontal length in the figure is 2mm, and the longitudinal length is 1mm. Fig. 8 is a graph showing a refractive index distribution. The refractive index is designed so that the distribution approximated by the stepwise expression 3-1 is formed in the center of the element, and the distribution by the stepwise approximate expression 3-2 is formed in the peripheral portion. The thickness of each layer is the same as in Example 2.
[0120] In this example, a quartz film was laminated by CVD, and Ge was added to each layer to form a film having a desired refractive index, thereby fabricating a distributed refractive index lens. The relationship between the refractive index and the addition of Ge is described, for example, in Sect...
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Abstract
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