摘要:
Disclosed herein is a double-heterostructure semiconductor laser which emits a laser beam in a visible light range at ambient temperature. An active layer serving as a light emission layer is sandwiched between first and second cladding layers. The first cladding layer comprises an n type InAlP, while the second cladding layer comprises a p type InAlP and has a mesa stripe shape having slanted side surfaces so as to define a light waveguide channel of the semiconductor laser. Current-blocking layers are formed to cover the slanted side surfaces of the second cladding layer. The current-blocking layers comprise GaAs which is a III-V group compound semiconductor different from the III-V group compound semiconductor (i.e., InAlP) comprised in the second cladding layer. The composition ratio of aluminum in the second cladding layer is set not to be less than 0.4, whereby a Shottky barrier serving to inhibit or suppress a current leak in the light waveguide channel of the semiconductor laser is formed between the second cladding layer and the current-blocking layers.
摘要:
There is disclosed a semiconductor layer which can emit a continuous laser beam in a visible wavelength range. The laser has an n-GaAs substrate. On this substrate, an n-InGaAlP cladding layer, an active layer, and p-InGaAlP cladding layers are sequentially formed, thus forming a double hetero-structure. A mesa-shaped, upper cladding layer is provided, defining a laser beam-guiding channel. A thin p-InGaAlP contact layer and a mesa-shaped, p-GaAs contact layer are formed on the top surface of the upper cladding layer. Two n-type semiconductive, current-blocking layers cover the slanted sides of the upper, mesa-shaped cladding layer and also the contact layer. They are made of the same n-GaAs compound semiconductor material as the substrate.
摘要:
In a radiation image recording and reproducing method wherein a plurality of stimulable phosphor sheets are reused by repeated circulation through a radiation image recording step, a radiation image read-out step, and an erasing step, each stimulable phosphor sheet is provided with its own identifying code and each time a visible image is reproduced the identifying code of the stimulable phosphor sheet on which the corresponding radiation image was stored is simultaneously reproduced, thereby enabling identification of sheets requiring replacement. The number of times each sheet is subjected to image readout is counted, and sheets are selectively removed after they circulate a predetermined number of times indicative of sheet wear out.
摘要:
A radiation image and read-out apparatus comprises a conveying means for circulating stimulable phosphor sheets along a predetermined circulation path, an image recording section for recording radiation images of objects on the sheets, an image read-out section for reading out the radiation images from the sheets, an erasing section for releasing radiation energy remaining on the sheets, a sheet position detection means for outputting sheet position data, an object data input section for receiving data related to the objects, and a signal output control circuit for receiving the object data and the sheet position data, storing the object data in association with the sheet positioned at the image recording section at the time the object data is received, reading out the object data stored in the memory means in association with the sheets at the time the radiation images are read out in the image read-out section, and outputting data signals corresponding to the object data for the respective sheets together with signals corresponding to the radiation images recorded thereon.
摘要:
A gate-turn-off thyristor failure detecting circuit includes a detector which detects an off-gate signal for a gate-turn-off thyristor and a current level detector which compares the signal with a predetermined value and produces an output signal indicative of the failure of the gate-turn-off thyristor.
摘要:
A mirror device may include: a mirror including a base plate, a reflective film on a first surface of the base plate, and a plurality of first protrusions on a second surface of the base plate; a plurality of support parts for respectively supporting the plurality of the first protrusions, each support part having a groove formed therein for guiding the first protrusion; and a plurality of clamps for respectively pressing the plurality of the first protrusions against the respective grooves in the plurality of the support parts.
摘要:
An apparatus for generating extreme ultraviolet light may include: a chamber having an opening through which a laser beam is introduced into the chamber; a reference member on which the chamber is mounted; a target supply unit for supplying a target material to be irradiated by the laser beam to a predetermined region inside the chamber; a laser beam focusing optical system for focusing the laser beam in the predetermined region inside the chamber to turn the target material into plasma; and a collector mirror for collecting the extreme ultraviolet light emitted from the plasma.
摘要:
A mirror device may include: a mirror including a base plate, a reflective film on a first surface of the base plate, and a plurality of first protrusions on a second surface of the base plate; a plurality of support parts for respectively supporting the plurality of the first protrusions, each support part having a groove formed therein for guiding the first protrusion; and a plurality of clamps for respectively pressing the plurality of the first protrusions against the respective grooves in the plurality of the support parts.
摘要:
A lighting device (10) includes an optical member (1) having (i) an entrance surface which is provided with a columnar convex lens and a prism group constituted by a plurality of prisms and (ii) an exit surface (1 a) which is provided with a prism group (4a, 4b) constituted by a plurality of prisms that differ in shape. The prism group (4a) which is provided on the exit surface (1 a) changes a direction of a light ray which (i) is emitted in a normal direction of a substrate surface by being reflected therein and (ii) has a high intensity to a direction which is highly inclined with respect to the normal direction. Accordingly, it is possible to provide the lighting device (10) which has a simple arrangement and is capable of controlling a light distribution characteristic.
摘要:
A temperature controller for a gas laser which controls temperatures of a plurality of temperature-controlled apparatuses including a first temperature-controlled portion requiring a high-precision temperature-control and a second temperature-controlled portion requiring a low-precision temperature-control as compared with the first temperature-controlled portion and allowing a temperature-control with a low or high temperature as compared with the first temperature-controlled portion, comprises a first temperature control portion generating a cooling agent or a heating agent for adjusting a temperature of each first temperature-controlled portion, a second temperature control portion generating a cooling agent or a heating agent for adjusting a temperature of each second temperature-controlled portion, a first piping system connecting the first temperature control portion and each first temperature-controlled portion in parallel, and a second piping system connecting the second temperature control portion and each second temperature-controlled portion in parallel.