42results about How to "Small spot diameter" patented technology

The invention provides a magneto-optical switch. The magneto-optical switch comprises a single-fiber collimator, a first birefringent crystal, a first half-wave plate component, an optical rotation component, a second half-wave plate component, a second birefringent crystal and a dual-fiber collimator which are sequentially arranged in the optical path direction, wherein the optical rotation component is provided with a refractor; a first Faraday optical rotation piece is arranged on the side of the refractor close to the first half-wave plate component; an optical rotation device is arranged on the side of the refractor close to the second half-wave plate component; the optical rotation component is further provided with a magnetic field producer positioned outside the first Faraday optical rotation piece; the single-fiber collimator is a single-core beam-expanding fiber collimator with a beam-expanding optical fiber mounted therein; and the dual-fiber collimator is a dual-core beam-expanding fiber collimator with two beam-expanding optical fibers mounted therein. The magneto-optical switch provided by the invention adopts smaller devices, and the birefringent crystals and the optical rotation component are both small in size, so that the size of the magneto-optical switch is reduced and the manufacturing cost of the magneto-optical switch is lowered.

Disclosed is an optical probe for obtaining a micro spot light, comprising a rod-like glass body having a rectangular cross section as a core for propagating an light wave. The distal end portion of the glass body is gradually diminished toward the distal end so as to form a micro distal end face having a small diameter. The side surface of the distal end portion of the glass body in a direction perpendicular to the polarized direction of the light wave is coated with a light absorber formed of a metal film.

A plasmon generator has an outer surface including a propagation edge, and has a near-field light generating part lying at an end of the propagation edge and located in a medium facing surface. The propagation edge faces an evanescent light generating surface of a waveguide's core with a predetermined distance therebetween and extends in a direction perpendicular to the medium facing surface. The propagation edge is arc-shaped in a cross section parallel to the medium facing surface. The plasmon generator includes a shape changing portion in which a radius of curvature of the propagation edge in the cross section parallel to the medium facing surface continuously decreases with decreasing distance to the medium facing surface.

The invention relates to the technical field of solar cells. Aiming at the problems of high electrode cost and low photoelectric conversion efficiency of an N-type Topcon battery, it discloses an N-type Topcon battery with double-sided aluminum paste electrodes and a preparation method thereof. The front of the battery is provided with a front Silver main grid and front aluminum fine grid, and the back of the battery is equipped with a rear silver main grid and a rear aluminum fine grid; the preparation method of the above-mentioned battery: texture → B diffusion → BSG removal → alkali polishing → back LPCVD deposition of tunnel oxide layer and polysilicon Layer → rear P diffusion → PSG removal → winding plating → front AlO x layers and SiN x h y Layer Deposition → Backside SiN x h y Deposition → front / back UV laser ablation → screen printing. In the present invention, the front / back side is printed with aluminum paste to obtain aluminum grid lines and segmented silver busbars; the back side aluminum paste is replaced by silver paste to form a good field passivation effect, thereby increasing the diffusion length of carriers, improving battery Voc, and reducing battery life. production cost.

While a plurality of drive currents for flying height setting with current values smaller than a tentative optimum drive current are supplied to a light source, respectively, heater power is supplied to a heater part, and touch down of a thermally-assisted magnetic recording head is detected. Tentative optimum heater power is determined based on a correlation between the heater power when the touch down is detected and each drive current for flying height setting. The tentative optimum drive current is supplied to the light source part; the tentative optimum heater power is supplied to the heater part; a reference signal is recorded in a magnetic recording medium; and flying height of the thermally-assisted magnetic recording head is set by determining whether or not the reference signal is recorded with the desired signal intensity.