摘要:
The cladding and a portion of the core of a length of optical fiber are removed to form an interaction region. A form birefringent stack is positioned on the exposed core. The refractive index of the stack for polarizations parallel to the plane of the interaction region is approximately equal to the refractive index of the fiber core so that these polarizations radiate from the fiber. The refractive index of the stack for the polarization normal to the plane fo the interaction region is approximately equal to the refractive index of the cladding so that this polarization remains guided by the fiber. A photodetector forms an error signal from the polarization radiated from the fiber, and control circuitry processes the error signal to drive a polarization controller that adjusts the polarization of light input to the polarizer to minimize the error signal.
摘要:
A polarizing optical fiber has a core formed of a plurality of layers of dielectrics having different refractive indices. The dielectric layers form a composite structure having different refractive indices for light of different polarizations. The differing refractive indices cause the polarization states of light guided by the fiber to be non-degenerate so that energy ordinarily will not couple from one polarization to the other. The fiber includes a cladding that may have a refractive index either less than both core indices to provide a polarization maintaining fiber or greater than or equal to one of the core indices to provide a polarizing fiber. The method of fabrication of the layered core form birefringent optical fiber includes forming a structure of a plurality of layers of the dielectrics, heating the structure to form a monolith, stretching the monolith to form the fiber core, and adding the cladding to the core.
摘要:
The cladding and a portion of the core of apparatus of a length of optical fiber are removed to form an interaction region where the fiber will not guide a light wave. A metal thin layer placed on the exposed core and a portion of the cladding. Polarizations perpendicular to the metal film couple into the metal film to form a surface plasma wave that propagates parallel to the fiber while parallel polarizations radiate through the metal film. The surface plasma wave couples energy back into the fiber so that the throughput of the polarizer is only the perpendicular polarization component. A photodetector forms an error signal from the polarization radiated from the fiber, and control circuitry processes the error signal to drive a polarization controller that adjusts the polarization of light input to the polarizer to minimize the error signal and maximize the intensity of the desired polarization output from the polarizer.
摘要:
A method for surface treatment is disclosed. The method is achieved by forming a MgO film on a metal surface through anode processing of Mg or Mg alloy in an alkaline solution. The alkaline solution includes a hydroxide, a thickening agent, and a film adjusting agent. As the method is performed, the target object is immersed in the alkaline solution, and the target object is connected to an anode with an average electric current density of 1˜5 A/dm, at a temperature of 0˜30° C., and within a time period of 10˜120 minutes to form a film of 5˜25 μm. The forming rate of the film of the method of the present invention is fast, and the formed film is of little stress.
摘要:
A portable storage device comprises a housing having a first opening, a first directing portion and a second opening, and a main body having a storage portion, a connecting portion corresponding to the first opening, a second directing portion corresponding to the first directing portion, and a hanging portion corresponding to the second opening. The main body is slidably located inside the housing and is slidable between a first position and a second position. When the main body is situated at the first position, the connecting portion is exposed outside the first opening, and the hanging portion is hidden in the housing. The storage device is at a status of being used. When the main body is situated at the second position, the connecting portion is hidden in the housing, and the hanging portion is exposed outside the second opening. The storage device is at a status of being housed.
摘要:
This invention is a frequency shifter for receiving an optical carrier signal input and producing an output including a sideband that is shifted in frequency from the carrier. The frequency shifter includes an optical waveguide formed in a substrate of an electro-optically active material such as lithium niobate. A plurality of electrodes formed on the substrate cooperate with a signal generator to apply two perpendicular electric fields to the optical waveguide. The resultant of the two fields is a rotating electric field which produces a rotating birefringence in the optical waveguide. The rotating birefringence acts as a rotating wave plate, which shifts the frequency of optical signals input to the optical waveguide. The wave plate is preferably a half wave plate, which converts all of the input optical energy into the sideband.
摘要:
A transmission mechanism for an electrical nail gun includes a rotary transmission unit and a linear transmission unit in a housing of the electrical nail gun. The rotary transmission unit includes a motor driven by electricity, a flywheel driven by the motor and extending to form a cylinder thereon, a solenoid activated by electricity, and a moveable driving wheel adjacent to an end side of the cylinder. A clutch is formed between the cylinder and the driving wheel. The solenoid is buried in the cylinder so that a magnetic conductivity loop is constructed around the solenoid to produce the magnetic field when the solenoid is activated. The driving wheel is attracted to move to an engagement position to be driven by the flywheel, thereby driving the linear transmission unit to impact a nail when the solenoid is activated by electricity, and the driving wheel returns to a disengagement position to disengage from the flywheel, thereby stopping driving the linear transmission unit when the solenoid is demagnetized.
摘要:
A method for treating aluminum to enhance corrosion resistance of its surface. The chemical conversion coating aluminum and aluminum alloys are exposed to an aqueous PU solution to form a PU film on the surface. The aqueous PU solution comprises: (i) 5-15% weight of water dispersable polyurethane resin, (ii) 0.1-56 weight of cross-linking agent, and (iii) 80-94.9% weight of water.
摘要:
A portable storage device, such as a USB portable disk drive, comprises a main body and a rotation arm. The main body comprises a storage portion, a connection portion and a back portion. The connection portion comprises a first fastening portion, and the back portion comprises a second fastening portion. The rotation arm is rotatably connected to the main body, and the rotation arm has a third fastening portion corresponding to the first fastening portion and the second fastening portion. When the rotation arm is situated at a first position, the first fastening portion is engaged with the third fastening portion, and the portable storage device is at a status of being housed. When the rotation arm is situated at the second position, the second fastening portion is engaged with the third fastening portion, and the portable storage device is at a status of being used.
摘要:
A portable storage device, such as a USB portable disk drive, comprises a main body and a flexible casing. The main body has a connecting portion and a lamp portion. The flexible casing is attached to the main body and encircles the connecting portion. When the flexible casing is compressed and situated at a first position, the connecting portion is exposed outside the flexible casing, and the portable storage device is at a status of being used. When the flexible casing is not compressed and is situated at a second position, the connecting portion is hidden in the flexible casing, and the portable storage device is at a status of being housed. The lamp portion can be a light emitting diode (LED) for showing the operating status of the portable storage device, and a light-directing portion can be located at the outside of the lamp portion.