发明名称 |
Wavelength-selective diffraction element and an optical head device |
摘要 |
An optical head device having an optical element capable of transmitting without diffracting light having a wavelength emitted from a two-wavelength semiconductor laser and capable of diffracting light having another wavelength, to provide high utilization efficiency of light in a stable manner. For this purpose, a wavelength-selective diffraction element 1 A comprising a transparent substrate having a front surface on which a grating having a periodically recessed and projected shape in cross section is formed and a filling member 13 A filled in the concavo-convex portion 12 A of the grating wherein the concavo-convex portion of the grating is provided with an organic pigment having the absorption edge of light in a region having a shorter wavelength than the wavelength lambda<SUB>1</SUB>, and the concavo-convex member and the filling member have the same refractive index with respect to either one of light having a wavelength lambda<SUB>1 </SUB>and light having a wavelength lambda<SUB>2</SUB>, and they have different refractive indices with respect to the other light having a wavelength, is disposed between the light source and the objective lens of the optical head device.
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申请公布号 |
US6891147(B2) |
申请公布日期 |
2005.05.10 |
申请号 |
US20030639507 |
申请日期 |
2003.08.13 |
申请人 |
ASAHI GLASS COMPANY, LIMITED |
发明人 |
GOTO RYUICHIRO;HOTAKA HIROKI;OOI YOSHIHARU;NOZAWA REIKO;SHIMODAIRA NORIAKI;MURAKAMI RYOTA |
分类号 |
G02B5/18;G02B5/20;G02B27/10;G11B7/00;G11B7/09;G11B7/125;G11B7/135;(IPC1-7):G02B5/18;G11B11/00 |
主分类号 |
G02B5/18 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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