WO2005015701A1 - 多ビームレーザを用いた光源 - Google Patents
多ビームレーザを用いた光源 Download PDFInfo
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- WO2005015701A1 WO2005015701A1 PCT/JP2004/011627 JP2004011627W WO2005015701A1 WO 2005015701 A1 WO2005015701 A1 WO 2005015701A1 JP 2004011627 W JP2004011627 W JP 2004011627W WO 2005015701 A1 WO2005015701 A1 WO 2005015701A1
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- WIPO (PCT)
- Prior art keywords
- laser
- light source
- laser beams
- transparent material
- source according
- Prior art date
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/127—Lasers; Multiple laser arrays
- G11B7/1275—Two or more lasers having different wavelengths
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
- G11B7/1367—Stepped phase plates
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
- H01S5/4025—Array arrangements, e.g. constituted by discrete laser diodes or laser bar
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
- G11B2007/0006—Recording, reproducing or erasing systems characterised by the structure or type of the carrier adapted for scanning different types of carrier, e.g. CD & DVD
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/022—Mountings; Housings
- H01S5/0225—Out-coupling of light
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/022—Mountings; Housings
- H01S5/0225—Out-coupling of light
- H01S5/02255—Out-coupling of light using beam deflecting elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/022—Mountings; Housings
- H01S5/023—Mount members, e.g. sub-mount members
- H01S5/02325—Mechanically integrated components on mount members or optical micro-benches
Definitions
- the present invention relates to a light source using a multi-beam semiconductor laser that emits a plurality of laser beams, and particularly to a light source used for recording and Z or reproduction of an optical recording signal.
- the multi-beam semiconductor laser refers to a semiconductor laser (hereinafter simply referred to as “laser”) that can independently control and output laser beams of the same or different wavelengths.
- laser semiconductor laser
- monolithic multi-beam lasers are a laser in which a plurality of active layers are formed on a single substrate by crystal growth, and then a main electrode step and an element separation step are performed.
- a hybrid multi-beam laser is a method in which laser elements that output a single beam are formed on separate substrates by crystal growth, and then an electrode step and an element separation step are performed on each of them. These are combined to output multiple beams.
- a multi-beam laser having two or more beams having different oscillation wavelengths is particularly called a multi-wavelength laser.
- the emission points of all laser beams are formed in the same plane in front of the laser, and their positions in the optical axis direction are the same.
- the interval between the light emitting points is generally much larger than the interval between recording marks recorded on the optical disk surface by a plurality of laser beams. Therefore, When multiple laser beams emitted from a multi-beam laser are condensed on the optical disc surface by one optical system, not all beams are necessarily focused on the disk surface. There was.
- a device using a nitride-based compound semiconductor laser (hereinafter, referred to as a GaN-based blue-violet laser) having an oscillation wavelength of about 4.55 nm is expected. .
- a DVD (Digital Versatile Disc) device using a conventional red laser with an oscillation wavelength of 650 nm as a light source, or a laser with an oscillation wavelength of 780 nm as a light source
- CD_R Co-act Disc Recordable
- not only lasers with oscillation wavelengths of 405 nm but also lasers with wavelengths of 650 nm and 780 nm are required. It is also desirable to be mounted. In this case, mounting a monolithically formed multi-wavelength laser is very advantageous in terms of cost and the like.
- an object of the present invention is to provide a light source using a multi-beam laser, wherein each laser beam is focused at a predetermined position inside the light source. It is an object of the present invention to provide a light source capable of providing an optical path length difference between systems or changing the optical path length difference.
- the present invention relates to a light source using a multi-beam laser, and provides an optical path length difference between the respective beams inside the light source so that each laser beam is focused at a predetermined position. Is the most important feature. Brief Description of Drawings
- FIG. 1 is a perspective view of a light source according to Embodiment 1 of the present invention.
- FIG. 2 is a perspective view of a light source according to Embodiment 2 of the present invention.
- FIG. 3 is a perspective view of a light source according to a modification of the second embodiment of the present invention.
- FIG. 4 is a perspective view of a light source according to Embodiment 3 of the present invention.
- FIG. 5 is a perspective view of a light source according to Embodiment 4 of the present invention.
- FIG. 6 is a perspective view of a light source according to Embodiment 5 of the present invention.
- FIG. 7 is a perspective view of a light source according to Embodiment 6 of the present invention.
- FIG. 8 is a perspective view of a light source according to Embodiment 7 of the present invention.
- a transparent dielectric is disposed so as to face a light-emitting surface of a multi-beam semiconductor laser that emits a plurality of laser beams so that a part of the plurality of laser beams is transmitted, and the laser is used.
- the distance that one beam passes through the transparent dielectric is made variable. The remaining laser beam does not pass through the transparent dielectric.
- the intersection between the laser beam passing through the transparent dielectric and the laser beam not passing through the transparent dielectric intersects a plane orthogonal to the laser beam after output from the light source,
- the difference in optical path length between the light emitting points of these laser beams becomes variable.
- Plane mirrors 4 to 7 are formed at different distances from each light emitting point on the inner wall surface of the inner wall surface defining the concave portion 3 facing the light emitting surface of the multi-beam laser 1. Each laser beam emitted from the multi-beam laser 1 is reflected by the corresponding mirror. Each of the plane mirrors 4 to 7 is formed so as to be inclined with respect to the main surface of the substrate 2 so that its plane is parallel to the direction in which the four laser beams emitted from the multi-beam laser 1 are arranged. . It is desirable that the planes are formed such that the perpendicular to each plane makes 45 ° with each laser beam, that is, each laser beam is deflected by 90 °. With such an arrangement, when each laser beam is reflected by each of the plane mirrors 4 to 7, it is possible to prevent the cross section from expanding.
- the light source of the present embodiment is such that each of the plane mirrors 4 to 7 is formed at a different distance from each light emitting point, respectively.
- the optical path length difference is fixed to an arbitrary size depending on the distance between each plane mirror 4 to 7 and each light emitting point. It is possible to do. Therefore, by setting these optical path length differences to an appropriate size, when the light source of the present embodiment is incorporated in an optical disk device, each laser beam focuses on a recording medium at a predetermined position.
- the optical recording signal can be recorded and / or reproduced in an optimum state.
- the light source of the present embodiment is one in which the laser is mounted in the concave portion of one substrate in which the inner wall surface of the concave portion forms a mirror, so that the above-described effects can be obtained with a compact configuration. It has the feature of being able to.
- a GaN-based blue-violet multi-beam laser was used as the multi-beam laser 1.
- a GaN-based blue-violet multibeam laser is a semiconductor represented by the general formula [I nxA y y Gal—x-yN] (0 ⁇ x x 1, 0 ⁇ y x 1, 0 ⁇ x + y ⁇ l).
- the multi-beam laser used for the light source of the present embodiment is not limited to the GaN-based blue-violet multi-beam laser, but may be a multi-beam laser using InP or GaAs.
- the multi-beam laser used in the light source of the present embodiment may be a multi-wavelength laser in which at least two laser beams have different wavelengths.
- the multi-beam laser used for the light source of this embodiment is not limited to a monolithic multi-beam laser, but may be a hybrid multi-beam laser.
- the substrate 2 has a mirror whose inner wall surface facing the light emitting surface of the multi-beam laser 1 is parallel to the direction in which the plurality of laser beams emitted from the multi-beam laser 1 are arranged. Any material that can form one surface can be used. Also, not all mirrors need to always be at different distances from each light-emitting point, but at least two mirrors may only be at different distances. Needless to say, the number of laser beams emitted from the multi-beam laser is not limited to four, but may be any number as long as it is plural.
- FIG. 2 is a perspective view of the light source according to the second embodiment of the present invention.
- the part of Figure 1 The same reference numerals are given to the same parts as the parts, and the overlapping description will be appropriately omitted.
- the difference between the light source according to the present embodiment and the light source according to the first embodiment shown in FIG. 1 is that each laser beam emitted from the multi-beam laser 1 is not reflected by a mirror, but a transparent dielectric plate 8. Is transmitted.
- the transparent dielectric plate 8 is made of sapphire, and a plurality of regions having different thicknesses in the traveling direction of the laser beam are formed stepwise in correspondence with each light emitting point of the multi-beam laser 1.
- the stepped surface may face the light emitting surface of the multi-beam laser 1.
- each laser beam emitted from the multi-beam laser 1 passes through a corresponding region of the transparent dielectric plate 8 having a different thickness. Therefore, each laser beam emitted from the multi-beam laser 1 has a region having a considerably higher refractive index than air (refractive index in the a-axis direction of sapphire at a wavelength of 589 nm: 1.760).
- the plurality of regions having different thicknesses of the transparent dielectric plate 8 do not always have to have different thicknesses, and at least two regions may have only different distances. Further, in the above description, all laser beams are transmitted through the transparent dielectric plate 8, but there may be a laser beam that passes only through the air layer without transmitting through the transparent dielectric plate 8. If only one optical path length is required, which is different from the optical path length of the laser beam passing only through the air layer, the transparent dielectric plate 8 The thickness may be uniform in the direction. Furthermore, in this embodiment, a transparent dielectric made of sapphire was used as a material for adjusting the optical path length of each laser beam.
- a gas space air or light source in which Any material can be used as long as it is a transparent substance having a different refractive index from the sealing gas inside it if it is sealed inside.
- transparent does not necessarily mean that the absorption coefficient of the laser beam is 0, and it is sufficient that the absorption coefficient for the laser beam is sufficiently low for practical use.
- FIG. 3 shows a modification of the light source of the present embodiment.
- parts that are the same as the parts in FIG. 2 are given the same reference numerals, and overlapping descriptions will be omitted as appropriate.
- the difference between the light source shown in Fig. 3 and the light source shown in Fig. 2 is that each laser beam emitted from the multi-beam laser 1 is formed in a transparent dielectric layer with a plurality of steps with different thicknesses in the traveling direction of the laser beam. The point is that the light does not pass through the region of the body plate but passes through a plurality of regions having different refractive indices of the transparent dielectric plate.
- FIG. 4 is a perspective view of a light source according to Embodiment 3 of the present invention.
- parts that are the same as the parts shown in FIG. 2 are given the same reference numerals, and overlapping descriptions will be omitted as appropriate.
- the difference between the light source according to the present embodiment and the light source according to the second embodiment illustrated in FIG. 2 is that the transparent dielectric plate whose thickness changes stepwise is not opposed to the multi-beam laser, but is wedge-shaped. The point is that the transparent dielectric plate 9 in the shape of a triangle is opposed.
- the wedge-shaped transparent dielectric plate 9 is arranged so that the surface on the opposite side of the slope faces the light emitting surface of the multi-beam laser 1.
- the wedge-shaped transparent dielectric plate 9 is movable on the substrate 2 in a direction orthogonal to each laser beam from the multi-beam laser 1 or in a direction parallel to the slope. In the arrangement of FIG. 4, at least when the transparent dielectric plate 9 is moved to the rightmost side in the traveling direction of the laser beam emitted from the multi-beam laser 1, the light emitted from the multi-beam laser 1 is moved.
- At least one The transparent dielectric plate 9 is arranged so that the laser beam does not pass through the transparent dielectric plate 9 and at least one laser beam passes through the transparent dielectric plate 9.
- the laser beam passing through the transparent dielectric plate 9 is deviated from the orthogonal direction due to refraction on the slope of the wedge.
- a single mirror (not shown) is used to shift the transparent dielectric plate.
- the laser beam passing through 9 can be easily corrected in parallel with the laser beam not passing through.
- a transparent dielectric plate having a shape similar to that of the transparent dielectric plate 9 may be arranged in the traveling direction of the laser beam that does not pass through the transparent dielectric plate 9. It should be noted that, when the wedge-shaped transparent dielectric plate 9 is movable in a direction parallel to the slope of the wedge-shaped transparent dielectric plate 9, when the wedge-shaped transparent dielectric plate 9 is moved, the emission point of the emitted beam shifts. There is no.
- a laser beam passes between a laser beam that does not pass through the transparent dielectric plate 9 and a laser beam that passes therethrough, and between laser beams that pass through the transparent dielectric plate 9. Since the distance of the transparent dielectric plate 8 (zero for a laser beam that does not pass through the transparent dielectric plate 9) is different, it is apparent that the light source of the present embodiment has the same effect as the light source of the second embodiment. Further, in the light source of the present embodiment, the wedge-shaped transparent dielectric plate 9 can be moved in a direction orthogonal to each laser beam from the multi-beam laser 1 or in a direction parallel to the slope. Between the laser beam that does not pass through the transparent dielectric plate 9 and the laser beam that passes through, the intersection of the laser beam with the plane orthogonal to the laser beam, and the optical path length between each emission point. It is possible to change the difference continuously.
- the wedge-shaped transparent dielectric plate 9 may have its slope faced to the multi-beam laser 1. Further, the transparent dielectric plate 9 is not limited to a wedge shape, and its thickness in the direction of travel of the laser beam is non-linearly and continuously in a direction parallel to the plane of the substrate 2 and perpendicular to the direction of travel of the laser beam. It may have a changing shape. In this case, when the transparent dielectric plate is moved, the intersection between the laser beams passing through the transparent dielectric plate and the plane orthogonal to the laser beam, and each light emitting point The difference in the optical path length between and changes continuously.
- FIG. 5 is a perspective view of a light source according to Embodiment 4 of the present invention.
- the part of FIG. The same reference numerals are given to the same parts as the parts, and the overlapping description will be appropriately omitted.
- the difference between the light source according to the present embodiment and the light source according to the third embodiment shown in FIG. 4 is that the wedge-shaped transparent dielectric plate 9 is opposed to the movable wedge-shaped transparent dielectric plate 9.
- A is fixed on the substrate 2.
- the slopes of the two wedge-shaped transparent dielectric plates 9, 9A face each other in parallel.
- the slopes of the two wedge-shaped transparent dielectric plates 9 and 9A may be in contact with each other.
- the surfaces of the two wedge-shaped transparent dielectric plates 9, 9A opposite to the slopes are parallel to the direction in which the plurality of laser beams are arranged.
- the laser beam incident on the transparent dielectric plate 9 is deviated from the orthogonal direction because it is refracted on the slope of the wedge, but is incident on the slope of the transparent dielectric plate 9A.
- the two slopes are parallel, the two slopes are returned in the orthogonal direction, and are emitted from the opposite surface of the transparent dielectric plate 9A as it is. Therefore, in the case of the present embodiment, the laser beam passing through the transparent dielectric plates 9 and 9A is parallel to the laser beam not passing therethrough, and an extra optical system required for the third embodiment. Is unnecessary.
- the wedge-shaped transparent dielectric plate 9 in a direction perpendicular to each laser beam from the multi-beam laser 1 or in a direction parallel to the opposing surfaces of the two transparent dielectric plates 9 and 9A.
- the optical path between the intersection of the laser beam, which does not pass through the transparent dielectric plate 9, and the laser beam, which passes through, and a plane orthogonal to the laser beam, and each light emitting point can be continuously changed.
- the transparent dielectric plate 9 may be fixed, and the transparent dielectric plate 9A may be movable.
- FIG. 6 is a perspective view of a light source according to Embodiment 5 of the present invention. 6, parts that are the same as the parts shown in FIG. 4 are given the same reference numerals, and overlapping descriptions will be omitted as appropriate.
- the difference between the light source according to the present embodiment and the light source according to the third embodiment shown in FIG. 4 is that a rectangular parallelepiped transparent dielectric plate does not have a wedge-shaped transparent dielectric plate facing the multi-beam laser. The point is that the body plates 11 face each other.
- the rectangular parallelepiped transparent dielectric plate 11 is rotatable in the main surface of the substrate 2 around its center.
- the transparent dielectric plate 1 1 When the rectangular parallelepiped transparent dielectric plate 1 1 is rotated around its center, the transparent dielectric plate Since the distance of the laser beam passing through 11 through transparent dielectric plate 11 changes continuously, the distance between the laser beam not passing through transparent dielectric plate 11 and the laser beam passing through It is possible to continuously change the difference in the optical path length between the intersection point of the beam with a plane orthogonal to the laser beam and each light emitting point.
- the laser beam transmitted through the transparent dielectric plate 11 is deviated from the perpendicular direction because it is refracted when entering and exiting the transparent dielectric plate 11, but, for example, a mirror having an appropriate curved surface (shown in FIG. ) Can be made parallel to the laser beam that does not pass through the transparent dielectric plate 11.
- the rotation of the transparent dielectric plate 11 can be realized by using, for example, a micro, electoric port, mechanical system (MEMS) technology, or the like.
- the shape of the transparent dielectric plate 11 is not limited to a rectangular parallelepiped, and any shape can be used as long as the distance through which the laser beam from the multi-beam laser passes when rotated around its center changes. Shape may be used.
- FIG. 7 is a perspective view of a light source according to Embodiment 6 of the present invention. 7, parts that are the same as the parts shown in FIG. 2 are given the same reference numerals, and overlapping descriptions will be omitted as appropriate.
- the light source according to the present embodiment is different from the light source according to the second embodiment shown in FIG. 2 in that the thickness of the light source is smaller than that of a transparent dielectric plate in which a plurality of regions having different thicknesses are formed in the traveling direction of the laser beam. The point is that such a transparent dielectric plate 12 faces the multi-beam laser 1.
- the multi-beam laser 1 is a multi-wavelength laser in which at least two laser beams have different wavelengths.
- the refractive index of a transparent dielectric material such as sapphire generally has wavelength dispersion
- the refractive index of the laser beam intersects with the intersection of a plane orthogonal to all laser beams. , There is a difference in the optical path length between each light emitting point.
- FIG. 8 is a perspective view of a light source according to Embodiment 7 of the present invention.
- the multi-beam laser 21 is composed of a blue-violet laser (oscillation wavelength of 405 nm) and a red laser (oscillation wavelength of 650 nm) monolithically grown on a GaN substrate. This is a monolithic two-wavelength laser.
- the emitting end face of the laser beam is processed by RIBE (Reactive Ion Beam Etching) method using chlorine gas, which is a type of dry etching. A step is formed.
- RIBE Reactive Ion Beam Etching
- the emission end face of the laser beam is formed so as to form a step, the intersection of the two laser beams emitted from the red laser and the blue-violet laser with the plane orthogonal to both laser beams is formed.
- This has the effect that a difference occurs in the optical path length between each of the light emitting points. For this reason, even when both beams are focused on the surface of the optical disk by one optical system, by designing the step of the output end surface to a desired value in advance, both laser beams can be applied to the optical disk. On the other hand, it becomes possible to focus on a predetermined position.
- a two-wavelength laser is used as a multi-beam laser, but a laser that emits multi-beams of three or more wavelengths may be used.
- the RIBE method is used to form the step on the emission end face, other dry etching methods other than the RIBE method [eg, reactive ion etching (RIE) method] may be used. Any method can be used as long as it is a method that can form a resonator end face that is smooth and highly perpendicular to the element surface.
- RIE reactive ion etching
- Examples 1 to 6 may be used not only alone but also in combination of a plurality of examples.
- the wavelength of each laser beam is variable, when the light source of these embodiments is used as a light source of an optical disk apparatus, these laser beams can be focused on an optical disk. By using the chromatic aberration of the objective lens, the focal length can be finely adjusted.
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- Optics & Photonics (AREA)
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- Condensed Matter Physics & Semiconductors (AREA)
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- Semiconductor Lasers (AREA)
Abstract
Description
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JP2005513019A JPWO2005015701A1 (ja) | 2003-08-07 | 2004-08-06 | 多ビームレーザを用いた光源 |
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JP2003-288381 | 2003-08-07 | ||
JP2003288381 | 2003-08-07 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20180331495A1 (en) * | 2016-02-22 | 2018-11-15 | Mitsubishi Electric Corporation | Laser light source device and method of manufacturing laser light source device |
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WO2003102938A1 (fr) * | 2002-06-03 | 2003-12-11 | Sony Corporation | Element optique a deux longueurs d'ondes |
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2004
- 2004-08-06 JP JP2005513019A patent/JPWO2005015701A1/ja not_active Withdrawn
- 2004-08-06 WO PCT/JP2004/011627 patent/WO2005015701A1/ja active Application Filing
Patent Citations (9)
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JPH0354740A (ja) * | 1989-07-24 | 1991-03-08 | Matsushita Electric Ind Co Ltd | 光学情報記録部材および光学情報記録再生装置 |
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JPH10334504A (ja) * | 1997-05-29 | 1998-12-18 | Nec Corp | 光ヘッド装置 |
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JP2002164614A (ja) * | 2000-11-28 | 2002-06-07 | Nec Corp | 外部共振器型モード同期半導体レーザ装置 |
JP2002232077A (ja) * | 2001-02-02 | 2002-08-16 | Sony Corp | 半導体発光装置およびその製造方法 |
WO2003102938A1 (fr) * | 2002-06-03 | 2003-12-11 | Sony Corporation | Element optique a deux longueurs d'ondes |
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US20180331495A1 (en) * | 2016-02-22 | 2018-11-15 | Mitsubishi Electric Corporation | Laser light source device and method of manufacturing laser light source device |
US10868404B2 (en) * | 2016-02-22 | 2020-12-15 | Mitsubishi Electric Corporation | Laser light source device and method of manufacturing laser light source device |
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JPWO2005015701A1 (ja) | 2006-10-12 |
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