摘要:
An optical integrated circuit is disclosed. The optical integrated circuit includes: a dielectric waveguide having at least a waveguide layer for transmitting light in a first direction; a first reflector for reflecting the light in a substantially opposite direction to the first direction, the first reflector being formed on an end face of the waveguide layer; a grating coupler having a grating for diffracting at least a part of the light in a second direction which is different from the first direction, the grating coupler being formed at a surface of the waveguide layer; and a light detector for detecting the diffracted light, the light detector being optically connected with the dielectric waveguide.
摘要:
An optical device includes: a first dielectric slab waveguide having an effective refractive index N.sub.1 ; a second dielectric slab waveguide having an effective refractive index N.sub.2 ; and a third dielectric slab waveguide having a length 1 and an effective refractive index N.sub.3, the third dielectric slab waveguide being formed between the first dielectric slab waveguide and the second dielectric slab waveguide so as to connect the first dielectric slab waveguide with the second dielectric slab waveguides optically; wherein the length I and the effective refractive index N.sub.3 substantially satisfy following equations; ##EQU1## where .lambda. is a free-space wavelength of light traveling in the optical device and the light travels from the first dielectric slab waveguide to the third dielectric slab waveguide at an incident angle .THETA. in a single mode.
摘要:
An optical pickup can be provided, the optical pickup being capable of recording and playback of a plurality of optical disks having different specs by using light beams of different wavelengths, and further being suitable for integrating the semiconductor lasers and light receiving elements into a single package, by including: first and second semiconductor lasers adjacently disposed; a three-beam diffraction grating for generating three beams for tracking control; a second hologram element for diffracting light of the second semiconductor laser to guide it to a photosensor; a complex polarization beam splitter (PBS) for reflecting only light from the first semiconductor laser; and a first hologram element for diffracting light of the first semiconductor laser to guide it to the photosensor.
摘要:
An optical pickup can be provided, the optical pickup being capable of recording and playback of a plurality of optical disks having different specs by using light beams of different wavelengths, and further being suitable for integrating the semiconductor lasers and light receiving elements into a single package, by including: first and second semiconductor lasers adjacently disposed; a three-beam diffraction grating for generating three beams for tracking control; a second hologram element for diffracting light of the second semiconductor laser to guide it to a photosensor; a complex polarization beam splitter (PBS) for reflecting only light from the first semiconductor laser; and a first hologram element for diffracting light of the first semiconductor laser to guide it to the photosensor.
摘要:
An optical pickup can be provided, the optical pickup being capable of recording and playback of a plurality of optical disks having different specs by using light beams of different wavelengths, and further being suitable for integrating the semiconductor lasers and light receiving elements into a single package, by including: first and second semiconductor lasers adjacently disposed; a three-beam diffraction grating for generating three beams for tracking control; a second hologram element for diffracting light of the second semiconductor laser to guide it to a photosensor; a complex polarization beam splitter (PBS) for reflecting only light from the first semiconductor laser; and a first hologram element for diffracting light of the first semiconductor laser to guide it to the photosensor.
摘要:
To produce an ultrathin and easily assembled optical pointing device by reducing the number of components, an optical pointing device (10) of the present invention includes: a light source (2) for emitting light to an object (1); a light guide (6) for propagating therethrough light scattered by the object (1), the light guide including an image forming section (4) for forming an image with use of the light scattered by the object (1); and an image capturing section (7) for capturing the image with the light that has been scattered by the object (1) and that has exited the light guide (6). The light guide (6) guides a light beam (L) from the object via no air through an optical path extending from (i) a position where the light beam (L) enters the light guide to (ii) a position where the light beam exits the light guide (6).
摘要:
An opening direction of guide grooves formed in sub bearing portions 55, 58 are different from an opening direction of guide grooves formed in the main bearing portions 54, 57. Therefore, when the first, second lens holders 31, 32 can easily be assembled to the main guide shaft 50 and the sub guide shaft 51 by one operation that after the fitting of the sub guide shaft 51 into the guide groove of the sub bearing portion 55, 58 in the first, second lens holder 31, 32, the first, second lens holder 31, 32 is rotated and slid against the sub guide shaft 51 so that the guide groove of the main bearing portion 54, 57 is fitted to the main guide shaft 50 in Y direction.
摘要:
Power from a focusing motor (14) is transmitted via a gear (35a) to a focusing lead screw (15) so that a first lens holder (4) is moved in a direction of an optical axis. Power from a zooming motor (10) is transmitted via a gear (35b) to a zooming lead screw (11) so that a second lens holder (8) is moved in the direction of the optical axis. The first and second lens holders (4, 8), the focusing and zooming lead screws (15, 11), the focusing and zooming motors (14, 10), and the gears (35a, 35b) are contained in a housing (30, 31). The focusing motor (14) and the zooming motor (10) may be fixed to a gear case (30).
摘要:
An opening direction of guide grooves formed in sub bearing portions 55, 58 are different from an opening direction of guide grooves formed in the main bearing portions 54, 57. Therefore, when the first, second lens holders 31, 32 can easily be assembled to the main guide shaft 50 and the sub guide shaft 51 by one operation that after the fitting of the sub guide shaft 51 into the guide groove of the sub bearing portion 55, 58 in the first, second lens holder 31, 32, the first, second lens holder 31, 32 is rotated and slid against the sub guide shaft 51 so that the guide groove of the main bearing portion 54, 57 is fitted to the main guide shaft 50 in Y direction.
摘要:
Power from a focusing motor (14) is transmitted via a gear (35a) to a focusing lead screw (15) so that a first lens holder (4) is moved in a direction of an optical axis. Power from a zooming motor (10) is transmitted via a gear (35b) to a zooming lead screw (11) so that a second lens holder (8) is moved in the direction of the optical axis. The first and second lens holders (4, 8), the focusing and zooming lead screws (15, 11), the focusing and zooming motors (14, 10), and the gears (35a, 35b) are contained in a housing (30, 31). The focusing motor (14) and the zooming motor (10) may be fixed to a gear case (30).