公开(公告)号：US20040094699A1

公开(公告)日：2004-05-20

申请号：US10639507

申请日：2003-08-13

Applicant: ASAHI GLASS COMPANY LIMITED

Inventor： Ryuichiro Goto ,  Hiroki Hotaka ,  Yoshiharu Ooi ,  Reiko Nozawa ,  Noriaki Shimodaira ,  Ryota Murakami

IPC: H01J003/14 ,  H01J005/16

CPC classification number: G11B7/1353 ,  G02B5/1866 ,  G02B5/203 ,  G02B27/1006 ,  G02B27/1086 ,  G02B27/144 ,  G02B27/145 ,  G11B7/127 ,  G11B2007/0006

Abstract: 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 1A 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 13A filled in the concavo-convex portion 12A 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 null1, and the concavo-convex member and the filling member have the same refractive index with respect to either one of light having a wavelength null1 and light having a wavelength null2, 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.

Abstract translation: 一种具有光学元件的光学头装置，其能够在不衍射具有从双波长半导体激光器发射的波长的光并且能够衍射具有另一波长的光的情况下传输，从而以稳定的方式提供高的光的利用效率。 为此目的，一种波长选择性衍射元件1A，其包括具有前表面的透明基板，其上形成有横截面为周期性凹凸形状的光栅，填充部件13A填充在凹凸部12A中 光栅，其中光栅的凹凸部分具有在具有比波长λ1更短的波长的区域中具有光的吸收边缘的有机颜料，并且凹凸构件和填充构件具有与波长λ1相同的折射率 相对于具有波长λ1的光和波长λ2的光，并且相对于具有波长的其他光具有不同的折射率设置在光学头与光学头装置的物镜之间。