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    • 3. 发明申请
    • Acoustooptic Device and Optical Imaging Apparatus Using the Same
    • 声光装置及使用其的光学成像装置
    • US20080037100A1
    • 2008-02-14
    • US11571218
    • 2005-06-29
    • Hisashi MinemotoYasuo KitaokaIsao KidoguchiTakayuki NegamiYasuhito TakahashiToshimi NishiyamaKimihiko Shibuya
    • Hisashi MinemotoYasuo KitaokaIsao KidoguchiTakayuki NegamiYasuhito TakahashiToshimi NishiyamaKimihiko Shibuya
    • G02F1/33
    • G02F1/0072
    • The present invention provides an acoustooptic device usable even with light in the ultraviolet region, free from laser damage and optical damage, and excellent in acoustooptic performance and an optical imaging apparatus using the same. The acoustooptic device according to the present invention includes a high-frequency signal input part (65), a transducer part (64), and an acoustooptic medium (6). A high-frequency signal input from the high-frequency signal input part (65) is converted into a mechanical vibration by the transducer part (64), and an optical characteristic of the acoustooptic medium (6) varies depending on the mechanical vibration. The acoustooptic medium is formed of a Group III nitride crystal. The optical imaging apparatus according to the present invention includes a light source, an acoustooptic device, a driving circuit, and an image plane. Light from the light source is diffracted by the acoustooptic device in accordance with a signal from the driving circuit and the resultant diffracted light forms an image on the image plane. An acoustooptic medium of the acoustooptic device is formed of a Group III nitride crystal.
    • 本发明提供即使在紫外线区域中的光也可以使用,没有激光损伤和光学损伤以及良好的声光性能的光学装置和使用该光学装置的光学成像装置。 根据本发明的声光装置包括高频信号输入部分(65),换能器部分(64)和声光介质(6)。 从高频信号输入部(65)输入的高频信号由换能器部(64)转换为机械振动,声光介质(6)的光学特性根据机械振动而变化。 声光介质由III族氮化物晶体形成。 根据本发明的光学成像装置包括光源,声光装置,驱动电路和图像平面。 来自光源的光根据来自驱动电路的信号被声光装置衍射,并且所得到的衍射光在图像平面上形成图像。 声光装置的声光介质由III族氮化物晶体形成。
    • 10. 发明授权
    • Semiconductor laser and a method for fabricating the same
    • 半导体激光器及其制造方法
    • US5499260A
    • 1996-03-12
    • US282919
    • 1994-07-29
    • Yasuhito TakahashiAyumu Tsujimura
    • Yasuhito TakahashiAyumu Tsujimura
    • H01L33/10H01L33/28H01L33/30H01L33/40H01S5/00H01S5/22H01S5/223H01S5/327H01S3/18
    • H01S5/327H01S5/22H01S2304/04H01S5/2214H01S5/2227H01S5/2231
    • An n-ZnMgSSe lower cladding layer, an n-ZnSSe light guiding layer, an undopad CdZnSe active layer, a p-ZnSSe light guiding layer, a p-ZnMgSSe upper cladding layer, and a p-ZnSe cap layer are successively formed on an n-GaAs substrate. Then, grooves and a ridge are formed in the respective p-type layers by etching. A current blocking layer formed by laminating SiO.sub.2 layers and TiO.sub.2 layers in multiple layers is formed so as to bury the grooves. On the top surface of the ridge where the current blocking layer is not formed, an upper electrode is formed. On the bottom surface of the n-GaAs substrate, a lower electrode is formed, and thus the ridge type semiconductor laser is fabricated. This semiconductor laser is capable of emitting blue light with an oscillating wavelength of around 500 nm. The current blocking layer of the lamination of the SiO.sub.2 and TiO.sub.2 layers allows effective confinement of both light and carriers and a drastic decrease in the threshold current for a laser oscillation.
    • 在n-ZnMgSSe下包层,n-ZnSSe导光层,未掺杂的CdZnSe有源层,p-ZnSSe导光层,p-ZnMgSSe上包层和p-ZnSe覆盖层上依次形成 n-GaAs衬底。 然后,通过蚀刻在各个p型层中形成沟槽和脊。 形成通过层叠多层SiO 2层和TiO 2层而形成的电流阻挡层,以便掩埋沟槽。 在没有形成电流阻挡层的脊的顶表面上形成上电极。 在n-GaAs衬底的底表面上形成下电极,由此制造脊型半导体激光器。 该半导体激光器能够发射具有约500nm的振荡波长的蓝光。 SiO 2和TiO 2层的层压的电流阻挡层允许光和载流子的有效约束,并且激光振荡的阈值电流急剧下降。