Showing papers on "Splitter published in 1984"

Optical signal recorders employing two lasers and methods therefor

Abstract: An optical head for an optical signal recorder includes a nonpolarizing beam combiner for combining the light beams from two like-frequency, sic wavelength, lasers along one light path. The combined beams travel slightly diverging paths so that a first one of the beams can record signals on a disk while a second beam follows the first beam on the disk for direct reading-after-recording. Intermediate the combiner and the disk are a polarization type beam splitter and a focuser. One or more detectors receive reflected light from the disk via the beam splitter for detecting focus, sensed recorded signals and for tracking the beams to tracks of the disk. The combiner and splitter are preferably secured together as a single unit. The combiner uses refraction and internal reflection properties to combine the two like-frequency beams without polarization changes of either beam.

Passive Ti:LiNbO3 channel waveguide TE‐TM mode splitter

Abstract: A passive compact TE‐TM mode splitter has been demonstrated using Ti:LiNbO3 channel waveguides. Its operation is based on the interference between the two guided modes of a double‐mode waveguide segment connecting single‐mode input and output guides. A device made using one set of design parameters has splitting ratios of 12 dB for both polarizations. Another device made using different parameters has a splitting ratio of 17 dB for TM modes. The devices are capable of low‐loss, broadband operation.

Optical splitter for dynamic range enhancement of optical multichannel detectors

Abstract: An optical beam splitter divides an incoming converging optical beam into two or more spatially separated output beams that both have a desired attenuation ratio between consecutive output beams and also focus all output beams in substantially the same plane.

Splitter for use with a coal-fired furnace utilizing a low load burner

Abstract: An improved splitter for use with a coal-fired furnace utilizing a low load burner in which a splitter is provided in the main conduit leading from the pulverizer for splitting the stream of coal and air into two separate streams which are then fed to separate nozzles communicating with the furnace. The splitter includes a damper assembly defining a gap which can be adjustable and including a plurality of projections which prevent coal slippage along the damper blade.

A multiple-path dichroic optical beam splitter

Abstract: A dichroic beam splitter (13) design comprising a single unit assembly having a reduced number of components to provide for diminished weight and bulk, simplicity of alignment, greater optical efficiency and fewer steps in the assembly process to produce the device. The beam splitter includes two identical right triangular prisms (14, 17), a parallelogram shaped element (15), and a trapezoidal shaped element (16), all bonded together to form the single, L-shaped, beam splitter (13). High reliability, and ease of identification of component elements due to unique geometry, is provided by this approach. This device is especially useful for computer optical disk storage devices.

Surface acoustic wave power splitter

Abstract: PURPOSE:To obtain a power splitter with low loss by arranging repetitively the constitution of a basic building block for plural number of times in the propagating direction of a surface wave to constitute the splitter. CONSTITUTION:The constitution where the 1st and 2nd output transducers are arranged respectively at the upper and lower part at both sides of a couple of transducers split into the upper and lower parts is used as a basic building block and provided laterally for plural number of times, terminals corresponding electrically to the input and output are connected in parallel, an electric signal applied to an input terminal 12 is converted respectively into a surface acoustic wave by the upper/lower input transducers 14, 16, 18, 20, 22, 24, 26 and 28, the wave is converted again into an electric signal by opposed output transducers and the signal is outputted to output terminals 10 and 11. The number of pairs of each transducer repeated laterally in one chip is decreased gradually to decrease the leakage loss.

Optical applied voltage and electric field sensor

Abstract: PURPOSE:To prevent the decrease of optical intensity, and to improve considerably an optical applied voltage and electric field sensor in sensitivity and accuracy by placing a polarized beam splitter on one end face side of a crystal having an electrooptical effect, and a passive reflector on the other end face side, respectively, and setting a propagation distance of a light to two times of the length of a single crystal. CONSTITUTION:An incident light 30 is made incident to a polarized beam splitter 23 through an optical fiber 21 and a lens 22, and emitted as a linear polarized light (P component) of a constant vibration surface. A light is provided with a phase of pi/2 by passing through a 1/8 wavelength plate 24 by reciprocation until it is reflected by a passive reflector 26 and returned to the polarized beam splitter 23, and a phase difference being poportional to voltage to be measured and an electric field applied in the direction as indicated with an arrow E in a single crystal 25. A light is divided into two by a splitter 25, and only an S component of the light changes its direction by 90 degrees, is made incident to a lens 27, led as an emitted light 31 to a photodetecting part through an optical fiber 28, and photoelectrically converted. In this way, an optical intensity reaching the photodetecting part is increased, the SN ratio is improved, the measuring sensitivity and the accuracy are raised, and deterioration of temperature dependability and linearity is prevented.

Optical magnetic disc device

Abstract: PURPOSE:To enhance the use efficiency of a light source laser and improve the SN ratio by leading the laser light, which is reflected from a recording medium, to a polarizing beam splitter and dividing the reflected laser light into two with this splitter to input divided lights to photodetectors. CONSTITUTION:The light of a semiconductor laser 25 is condensed on a disc 8, and the reflected light has the plane of polarization rotated at + or -thetak in accordance with the magnetization direction of the reocrding medium. The reflected light is given to an optical rotator 30 through an object lens 29 and a half mirror 28 again and has the plane of polarization rotated at a prescribed angle psi. This light is led to a polarizing beam splitter 32 and is divided to P components and S components. P components parallel with the plane of incidence pass through the splitter 32 and are given to a photodetector 34 through a cylindrical lens 33. S components vertical to the plane of incidence are reflected and are made incident to a photodetector 35. Since outputs of photodetectors 34 and 35 have a push-pull relation, they are amplified differentially to take out a binary signal which is not affected by a variance of the intensity of light.

Optical fibre laser gyro

Abstract: Polarised light from a laser 11 is split at 15 into orthogonally polarised beams 15a and 15b incident on respective ends of a loop 16 of single polarisation optical fibre. After the transmitted beams have been recombined at 15, their relative phase is determined using a g DIVIDED 4 plate 17, analyser 18 and detector 19. Alternatively the recombined beams may be directed via a g DIVIDED 4 plate and a further polarising beam splitter to two photodetectors connected to the imputs of a differential amplifier, or the single detector 19 may be in a nulling loop where it controls a Pockels and Faraday element acting on the recombined beams. Polarising splitter 15 may be replaced by an ordinary splitter if one end of coil 16 is preceded by a 45 DEG rotation Faraday element.

Polarized beam splitter for video disk player

Abstract: PURPOSE:To lead only a regular laser light to a detector, and to prevent stray light from being made incident to the detector by angling a stray light generating surface against an optical axis so that a reflected stray light from the stray light generating surface of a splitter is not inputted to the detector. CONSTITUTION:A stray light generating surface of a polarized beam splitter 1 for a video disk player is angled against optical axes X, Y. For instance, when a shape of the polarized beam splitter 1 is a rectangular, and the surface A is placed at 45 deg. against the optical axes X, Y, the surfaces B, C do not fall at right angles with the optical axes but have some angle, and stray light M1, M2 do not coincide with the optical axis Y, and are not made incident to a detector 4. In this way, it can be prevented that stray light is made incident to the detector 4, therefore, a deterioration of performance such as a deterioration of S/N ratio of a picture, etc. can be prevented.

Beam output monitor device

Abstract: PURPOSE:To make the signals proportional to the output by a method wherein, when a part of output beam is picked up by the first beam splitter and the first reflecting beam is changed into the second reflecting beam to be made to enter into a photoelectric converter as monitor signal, the incident angles of the splitter are equalized to make the incident surfaces perpendicular to each other. CONSTITUTION:The output beam 12 as random polarization from a laser oscillator 11 permeates through the first beam splitter 13 slanting upon an optical axis 12a by 45 degrees whereon a laser output compensating plate 23 compensating the strength fluctuation per polarizing direction is provided. Besides, the second beam splitter 15 slanting upon the first reflecting beam 14 from the splitter 13 by 45 degrees is provided above the splitter 13 and the second reflecting beam 16 from the second beam splitter 15 is made to enter into a photoreceptor 20 with photoelectric conversion element to constitute a photoelectric converter 22 together with a beam detecting circuit 21 monitoring the entered output. In such a constitution, the output may be made proportional to the output regardless of P of S polarization beams enabling the output to be monitored.

Method and device for injecting and molding multilayer multiple material synthetic resin article and article

Abstract: Polymer melt material flow stream splitter devices, including runner extensions, T-splitters and Y-splitters are provided, for splitting an incoming flow stream channel for each melt material, into first and second branched flow channels of equal length which communicate with sets of first and second branched exit ports, each set in an axially aligned, spaced pattern in different peripheral surface portions of the respective splitter devices

Object measuring device

Abstract: PURPOSE:To eliminate the need for a back light device and to reduce the size and power consumption of a device by receiving the reflection signal from a target object by using laser light and obtaining the three-dimensional data of the object in accordance with the distance data in a prescribed range. CONSTITUTION:Laser light l1 is modulated by an optical modulator 2 to laser light l2 and is projected through a beam splitter 5, a lambda/4 plate 6, a reflection plate 7, rotry polyhedral mirrors 18a and 18b to a target object. The reflected wave thereof is introduced to the splitter 5, and only the modulated signal component is drawn through a deflecting plate 8, a photomultiplier tube 9 and a filter 10 and is supplied to a mixer 13. Th modulating signal of an oscillator 3 is also supplied to a mixer 12. The outputs from the mixers are applied to a phase detecting circuit 16 then the distance from the target is calculated in an arithmetic circuit 17, by which the respective distances in a scanning range A are determined. The distance data are stored in a memory 23 in synchronization with the rotation of the mirrors 18a, 18b and the data on the ruggedness of the data is formed (image processing) 24 in accordance with the distance data and are stored as the three-dimensional data on the target in an image memory 25.

Reproduction structure for photomagnetic information recorder

Abstract: PURPOSE:To reduce the loss of light quantity and to improve the S/N of a reading signal by providing the Faraday rotation elements between a beam splitter and a recording medium and between a pair of beam splitters. CONSTITUTION:A beam splitter 38 leads the laser beam of a light source 32 to a photomagnetic recording medium 41 and also leads the reflected light of the medium 41 to a detector 44. A Faraday rotation element 39 having the polarizing direction turned by a prescribed angle is set between the medium 41 and the splitter 38. In addition, a light turning element 37 and a Faraday rotation element 36 having the polarizing direction turned by a desired angle are set between the splitter 38 and a splitter 35 which leads the reflected light sent toward the light source 32 by the splitter 38 to a detector 46. In such a constitution, an optical system is simplified with reduction of loss of the light quantity. Thus the S/N is improved for the reading signal of the medium 41.

Method and device for measuring energy distribution of laser beam

Abstract: PURPOSE:To measure safely, quickly and exactly the lateral mode energy distribution of a laser beam with the use of a light splitter wherein temp. detectors 15 are attached to one side of irradiating plates provided with many splitting passages by making the laser beam incident to the end face of the light splitter, detecting the beam energy of each passage and displaying the energy distribution chart conforming to the energy distribution of the end face on a display device thereby measuring the energy distribution. CONSTITUTION:The laser beam generated from a laser generator 1 passes through an optical system and enters a light splitter 3. The splitter 3 is formed by providing irradiation plates 13 respectively to the many split passages 11 enclosed by vertical and horizontal partition walls 7, 9 along the optical axis. The joint part 17 of a temp. detector 15 is attached by brazing to one surface of each plate 13. The laser beam incident to the splitter 3 falls onto the plates 13 without being interfered by the adjacent passages thereby elevating the temp. of said plates. The temp. generates electromotive force in the detectors 15. The electromotive force for each passage is converted to an electrical signal by an A/D converter and the electrical signal is transferred through an interface 19 to a computer 21.

Optical scanner with multiple beams

Abstract: PURPOSE:To enable high-speed scanning with high efficiency without increasing the speed for deflecting light, by synthesizing the beams from the plural light sources differing in the polarization direction with a polarization beam splitter and scanning simultaneously plural scanning lines. CONSTITUTION:Lasers LD1, LD2 which are deflected respectively parallelly and perpendicularly to the plane of the figure are collimated by collimating lenses L1, L2 to parallel light which are made incident to a polarization beam splitter BS and are thereby synthesized. The laser LD2 transmitted through the splitter BS and the laser LD2 reflected by the same are deviated by an angle DELTAtheta=DELTAP/f (DELTAP is the pitch of scanning lines and (f) is the focal length of an ftheta lens) in this case. The synthesized light is reflected by a rotary polygonal mirror RM and is made into two scanning lines as it passes through the ftheta lens. A scanning plane 1 is scanned by said scanning lines. The same scanning speed as the speed obtained by doubling the number of revolutions of the mirror RM is thus obtd. Since the splitter BS is used for synthesizing the beams, the high efficiency is obtd.

Reproducing structure of optical magnetic information recording device

Abstract: PURPOSE:To enhance the use efficiency of the light of a light source laser to improve the S/N ratio of the signal of an optical magnetic recording medium by providing a Faraday rotating element, which rotates the polarization direction at a prescribed angle, between a beam splitter and the recording medium. CONSTITUTION:The laser parallel light from a laser light source 28 is reflected by a polarizing beam splitter 31 and passes through a Faraday rotating element 32 and is flare diaphragmed by an object lens 33 and is irradiated to an optical magnetic recording medium 34. This light is reflected by the medium 34 and passes through the lens 33, the element 32, the splitter 31, and lenses 35 and 36 again and is made incident to a detector 37.The beam which passes through the element 32 on the returning path becomes a beam having two kinds of oscillation direction of 45 deg.+Qk and 45 deg.-Qk in accordance with the recording direction of the medium 34. The splitter 31 is used as an analyzer also, and therefore, a signal which has a variable intensity in accordance with the recording direction of the medium 34 is obtained with a high S/N ratio in an element (b).

Automatic alignment device

Abstract: PURPOSE:To negate the influence of chromatic aberration of a projection optical system by a method wherein a polarization beam splitter to alignment wave- length is used between a reticle and a wafer, and a nearly conjugate position to the reticle or the wafer is provided in the introduced optical system. CONSTITUTION:When the beam splitter 5 is arranged between the front group 4-1 and the back group 4-2 of the projection optical system 4 to project in the image of the reticle 1 on the wafer 2 by reduction or equimultiple, the splitter acts as the polarization beam splitter to an alignment beam, and as a simple parallel plane plate to an exposure beam. Out of an incident beam to the beam splitter 5 after passing through a relay lens 10, a reflected beam forms an image on the wafer 2, and scans on the wafer. The reflected beam is reflected again by the splitter, and enters in an optoelectric detector system 15-17. A transmitted beam enters in a lambda/4 plate 6, reflected by a mirror 8, the beam whose polarizational direction is changed is reflected by the splitter 5 this time to enter in the front group 4-1, reaches the reticle 1, the returned beam passes through the splitter this time because the polarizational direction is rotated, and is led to the photo detector 17.

Astigmatic optical pickup

Abstract: PURPOSE:To facilitate a production of an astigmatic optical pickup with a low cost, by providing a concave lens and a columnar lens between a 4-split optical sensor and the output surface of disk reflected light of a polarized beam splitter. CONSTITUTION:A concave lens 10 disperses the reflected light given from a disk 7 and deflected 90 deg. by a polarized beam splitter 2. These lenses 10 and 20 are set between the output surface of disk reflected light of the splitter 2 and a 4-split optical sensor 9. The positions of lenses 10 and 20 are decided so as to obtain a circular beam of a desired diameter at the center of the sensor 9 when the disk 7 has a focused state. This process can solves satisfactorily a problem that a mass production is unsuitable to a columnar lens of a small curvature radius owing to its high cost.

Switching piece for electrical switching apparatuses

Abstract: The invention relates to a switching piece for electrical switching apparatuses, especially contactors. The power supply is reduced in a stepped manner and the arc splitter (5) is bent in a U-shape and engages around the contact support (2) with an air gap (9) so that the electrical connection is made purely via the attachment screw (6). The edge parts (8) are set back in the region of the contact support so that the contact link, with the contact support (3), cannot come into contact with the arc splitter even in the event of a certain oblique position of the contact link. In order to fix the power supply lead (1) and the arc splitter (5) with respect to one another, stud-shaped projections (20) are stamped onto the power supply lead (1), which projections interact with recesses (21) in the arc splitter (5). The flaps (23) which are formed by the recesses (21) are pressed onto one another once the parts have been put on.

Polarization plane retaining-optical fiber type sensor

Abstract: PURPOSE:To sharply improve the precision of measurement by a method wherein a straight polarized light from a light source is made to enter a polarized beam splitter at an angle of 45 deg. to the optical axis of the splitter through a polarization plane retaining optical fiber for a lead wire. CONSTITUTION:A light emitted from a light source 201 is made to enter a polarized beam splitter 204 at an angle of 45 deg. to the optical axis of the splitter by using a polarization plane retaining optical fiber 202. The light incident on PBS 204 is split into a transmitted light and a reflected light having a half power respectively, and these transmitted and reflected lights enter the same polarization axis from the opposite ends of a polarization plane retaining-optical fiber 205 respectively. The present invention can improve the precision of measurement sharply, since it uses the polarization plane retaining-optical fibers in this way as fibers therefor.

Multi-combline warped-mode directional couplers

Abstract: A first report of multi-combline warped-mode directional couplers using three lines is presented. The technique outlined can be extended to many different designs and additional lines. The specific example given has been designed as a 3-way equal power splitter with a phase difference of 180° and 0° between the two outer lines and the central line. The coupler is fed from the central line at the input. The device exhibits significant coupling over the range 0.7 to 9 GHz, but with ripples at the lower frequencies and loss at the higher frequencies the most useful range is about 3 to 8 GHz.

Interferometric fibre-optic gyroscope and method for its operation.

Abstract: The invention relates to an interferometric fibre-optic gyroscope and one method for its operation. This gyroscope comprises a loop of optical fibre 10 in which two light waves are sent in opposite direction by means of a beam splitter 13 and a laser 14. The splitter 13 sends the two output beams onto a photodetector 15. The output signal serves to control a first phase modulation by the phase-cancelling (-offsetting) device 19 controlling the phase shifter 18, at a frequency 1/2 tau where tau is the optical transit time in the loop. A second phase modulation in synchronism at a frequency 1/4 tau is produced by the modulator 17 controlling the phase shifter 16, the light source being switched at the frequency 1/2 tau . The invention is applicable to fibre-optic gyroscopes using the Sagnac effect.

Paving-stone and brick splitter

Abstract: Paving-stone and brick splitter having a plurality of upper (10) and lower (16) tools arranged next to one another in a frame (12), the upper tools (10) being driven hydraulically and the upper and lower tools each comprising a plurality of individual splitting wedges (38 and 40) movable relative to one another in the splitting direction (P) and preferably supported hydraulically. The splitter comprises, furthermore, a worktable (14) supported on the frame (12) so as to be resilient in the splitting direction and having a slit-shaped orifice (36) for the passage of the lower tools (16), the support being obtained via hydraulically, pneumatically or hydropneumatically controlled piston/cylinder units (50), in such a way that, during the splitting of the stone material, the worktable (14) moves downwards and, after the splitting, moves upwards again into its upper initial position in accordance with the return movement of the upper tools (10), so that the lower tools (16) are located below the working surface of the worktable (14). For the mutual support of the upper tools (10) movable relative to one another in the splitting direction, these have a common linear bearing (18) on each of the mutually confronting sides.

Photostabilized gas laser device

Abstract: PURPOSE:To remarkably improve the stability of a gas laser device by setting the incident angle of a laser light to a beam splitter which forms the laser device to an angle smaller than the specific angle, thereby reducing the noise content rate of a laser light. CONSTITUTION:When a beam splitter 3 is inserted into the laser output optical path 2 from a laser oscillator 1, the incident angle of the laser light to the splitter 3 is set to an angle smaller than 45 deg.. Then, a photodetector 5 is arranged at the position for receiving the surface reflected light 4 of the splitter 3, the output is connected to the negative input terminal of an operational amplifier 6, and the positive input terminal of the amplifier 6 is connected to a reference power source 8. Further, the output side of the amplifier 6 is connected to an exciting power source 7, which is then connected to an oscillator 1. With this structure, the output signal of the detector 5 is inputted to the amplifier 6 to obtain a signal proportional to the difference from the reference voltage signal, thereby controlling the power source 7 of the oscillator 1 to regulate the light output.

Splitter of optical signal

Abstract: PURPOSE:To lead an optical signal easily and separately by placing two prisms so that each optical signal input surface becomes adjacent by one plane, and also its boundary line becomes a straight line, and making the boundary line on the optical signal input surface coincide with a split line of an optical transmission window forming a function pattern in a mask CONSTITUTION:A splitter 3 consists of two prisms 4, 5, and the prisms 4, 5 are a parallelopiped-shaped prism, respectively, upper faces 41, 51, and lower faces 46, 56 are an input surface of an optical signal and its output surface, respectively, and coating is performed to side faces 42-45 and 52-55 so as to reflect 100% of light The input surfaces 41, 51 are adjacent in one plane, also its boundary line 3a is a straight line, an optical transmission window 2b corresponding to a function pattern is provided on a mask 2, and the mask 2 is superposed on the input surfaces 41, 51 so that a split line 2a of the mask 2 coincides with the boundary line 3a In this way, an optical signal can be split into two easily by only making the split line 2a of the mask 2 coincide with the boundary line 3a

Optical beam splitter and focuser in Ti:LiNbO3 planar waveguide

Abstract: A Λ-type two-electrode system on a Ti diffused optical waveguide in LiNbO3 has been studied in symmetrical and in asymmetrical operation regimes. In the first case the device acts as a beam splitter or focuser, depending on the polarity of the applied voltage. In the second case the device acts as a scanner. The driving voltage is relatively low. Possible applications are optical communication systems and optical processing of information.

Tracking control optical system of optical disk

Abstract: PURPOSE:To obtain a compact tracking control optical system, by providing a polarized beam splitter and a diffraction grating into the dispersed luminous fluxes existing between a light source and a collimator lens. CONSTITUTION:The dispersed luminous fluxes delivered from a semiconductor laser 11 are made incident to a diffraction grating 14, The 0-order and + or -1-order diffracted beams are converted into parallel luminous fluxes by a collimator lens 12 after passing through a polarized beam splitter 13 and then formed into diffracted O-order and + or -1-order spots S0, S+1 and S-1 on an optical disk by a focusing lens 16 via a lambda/4 plate 15. Then the reflected light travels backward and is reflected by the splitter 13 and formed into an image on a photodetecting surface 19 by a cylindrical lens 19. Thus a tracking control signal is obtained. In such a way, a compact optical system is obtained.