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    • 8. 发明授权
    • Optical pickup using waveguide
    • 使用波导的光学拾取器
    • US4929044A
    • 1990-05-29
    • US193594
    • 1988-05-13
    • Akira ArimotoSachiko IshikawaKeiji Kataoka
    • Akira ArimotoSachiko IshikawaKeiji Kataoka
    • G11B7/12G11B7/135
    • G11B7/1353G11B7/1245
    • An optical pickup comprises at least a semiconductor laser, a waveguide optically coupled with the semiconductor laser for propagating therein a light from the semiconductor to guide it to a recording medium and a light deflector element provided on the waveguide for deflecting the light propagated in the waveguide by means of a surface acoustic wave. A multi-mode oscillation laser capable of stably operating in longitudinal modes the number of which is not larger than 5 is used as the semiconductor laser. The semiconductor laser is disposed in proximity to the waveguide at a distance not larger than 1 .mu.m, thereby inputting the light from the semiconductor laser into the waveguide with a high efficiency. A frequency applied to the light deflector element may be changed upon change between a read-out state and a write-in state so that a light spot on the recording medium is held at a predetermined position (track or address). In the case where a grating is used as a light coupling element between the waveguide and the exterior thereof, a hologram grating is disposed in a path of the light derived through the light coupling grating from the waveguide to the exterior thereof so that a chromatic aberration produced at the light coupling grating due to a change in wavelength of the semiconductor laser is cancelled by that produced at the hologram grating.
    • 光学拾取器包括至少半导体激光器,与半导体激光器光学耦合的波导,用于在其中传播来自半导体的光以将其引导到记录介质,以及设置在波导上的光偏转元件,用于偏转在波导中传播的光 借助于表面声波。 作为半导体激光器,使用能够稳定地以纵向模式操作的多模振荡激光器,其数量不大于5。 半导体激光器以不大于1μm的距离布置在波导附近,从而将来自半导体激光器的光以高效率输入到波导中。 在读出状态和写入状态之间变化时,施加到光偏转元件的频率可以改变,使得记录介质上的光点保持在预定位置(轨道或地址)。 在将光栅用作波导及其外部之间的光耦合元件的情况下,全息光栅设置在通过光耦合光栅从光波导到其外部的光的路径中,使得色差 由于半导体激光器的波长的变化,在光耦合光栅处产生的光线被全息光栅所产生的消除。