An optical device as set forth in claim 6, wherein the second optical material comprises titanium oxide, tantalum oxide, gallium phosphate, gallium nitride, a compound of titanium, niobium, and oxygen, a compound of titanium, tantalum, and oxygen, or silicon nitride.ĩ. An optical device as set forth in claim 5, wherein the first optical material comprises titanium oxide, tantalum oxide, gallium phosphate, gallium nitride, a compound of titanium, niobium, and oxygen, a compound of titanium, tantalum, and oxygen, or silicon nitride.Ĩ. ![]() An optical device as set forth in claim 1, wherein the refractive index of said second optical material is between 1.4 and 4.0.ħ. An optical device as set forth in claim 1, wherein a refractive index of said first optical material is between 1.3 and 1.9.Ħ. An optical device as set forth in claim 2, wherein the concavity has a substantially rotationally symmetric shape with reset to an optical axis, and the shape of the surface of the concavity when the concavity is cut along its symmetry axis is an arc or an substantially arc.ĥ. An optical device as set forth in claim 2, wherein the second optical portion comprises an optical oil or a liquid crystal.Ĥ. An optical device as set forth in claim 1, wherein the first optical portion has a first flat surface located at an area around a circumferential edge of the concavity, and a second flat surface substantially parallel to the first flat surface, wherein the second optical material comprises a liquid-like optical material and is filled in the concavity and further comprising a layer made of an optical material for sealing the concavity filled with the second optical material on the first flat surface of the first optical portion from which the concavity is formed.ģ. ![]() ![]() An optical device comprising: a first optical portion made of a first optical material and having a concavity and a second optical portion comprising a second optical material having a refractive index different from that of the first optical material, and inserted into the concavity.Ģ.
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