WO2005048420A1 - 半導体レーザ及びその製法 - Google Patents
半導体レーザ及びその製法 Download PDFInfo
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- WO2005048420A1 WO2005048420A1 PCT/JP2004/016872 JP2004016872W WO2005048420A1 WO 2005048420 A1 WO2005048420 A1 WO 2005048420A1 JP 2004016872 W JP2004016872 W JP 2004016872W WO 2005048420 A1 WO2005048420 A1 WO 2005048420A1
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- Prior art keywords
- semiconductor
- substrate
- layer
- metal layer
- cleavage plane
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- 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
- H01S5/0201—Separation of the wafer into individual elements, e.g. by dicing, cleaving, etching or directly during growth
-
- 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
-
- 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
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/1082—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region with a special facet structure, e.g. structured, non planar, oblique
-
- 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
- H01S5/20—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers
- H01S5/22—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers having a ridge or stripe structure
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- 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
- H01S5/30—Structure or shape of the active region; Materials used for the active region
- H01S5/32—Structure or shape of the active region; Materials used for the active region comprising PN junctions, e.g. hetero- or double- heterostructures
- H01S5/323—Structure or shape of the active region; Materials used for the active region comprising PN junctions, e.g. hetero- or double- heterostructures in AIIIBV compounds, e.g. AlGaAs-laser, InP-based laser
- H01S5/32308—Structure or shape of the active region; Materials used for the active region comprising PN junctions, e.g. hetero- or double- heterostructures in AIIIBV compounds, e.g. AlGaAs-laser, InP-based laser emitting light at a wavelength less than 900 nm
- H01S5/32341—Structure or shape of the active region; Materials used for the active region comprising PN junctions, e.g. hetero- or double- heterostructures in AIIIBV compounds, e.g. AlGaAs-laser, InP-based laser emitting light at a wavelength less than 900 nm blue laser based on GaN or GaP
-
- 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
- H01S5/0201—Separation of the wafer into individual elements, e.g. by dicing, cleaving, etching or directly during growth
- H01S5/0202—Cleaving
-
- 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
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/16—Window-type lasers, i.e. with a region of non-absorbing material between the active region and the reflecting surface
Definitions
- the present invention relates to a semiconductor laser having a semiconductor laminated portion having a cleavage plane not parallel to a cleavage plane of a substrate and having a material strength, and a method of manufacturing the same.
- nitride semiconductor lasers are being actively developed for uses such as high-density DVDs.
- a semiconductor laminated portion 59 including an n-type semiconductor layer 52, an active layer 54, and a p-type semiconductor layer 53 is formed on a sapphire substrate 51.
- the p-type semiconductor layer 53 is etched in a stripe shape due to current confinement, and a p-electrode 58 is provided on the uppermost surface of the p-type semiconductor layer 53, while the n-type semiconductor layer 52 has a partially exposed surface.
- Patent Document 1 Japanese Patent Application Laid-Open No. 08-097502 (FIG. 3)
- a semiconductor laser amplifies light generated by current injection by repeating reflection at a cavity facet, and then emits amplified light mainly to one side of the cavity facet.
- the cavity facet is generally a plane along the cleavage plane of the crystal material used for the semiconductor laminated portion.
- a sapphire substrate suitable for growing a nitride material is generally used as a substrate for a nitride semiconductor laser.
- the semiconductor product Some have a cleavage plane that is not parallel to the cleavage plane of the nitride material forming the layer part, and some have no cleavage plane in the substrate itself. Therefore, even if an attempt is made to form the cavity end face on the cleavage plane of the semiconductor lamination part, a large number of cracks will be formed in the cross section of the substrate whose cleavage plane is not parallel.
- the cracks generated in the substrate propagate to the cleavage plane of the semiconductor lamination part, and the cleavage plane of the semiconductor lamination part becomes rough.
- the semiconductor laminated portion is in contact with the substrate, propagation of cracks cannot be avoided, and a good cleavage plane cannot be obtained in the semiconductor laminated portion. Therefore, light loss at the end face of the resonator increases, so that the amplifying effect cannot be sufficiently exerted, so that laser oscillation does not occur or the operating current increases.
- another method of forming the cavity end face is to dry-etch the semiconductor laminated portion at the cavity end face formation location rather than forming the cavity end face using a cleavage plane, which is an artificial method. Attempts have been made to obtain cavity facets. However, even if dry etching is used, there is a limit to the surface processing, and a surface shape similar to the cleavage plane cannot be obtained. Further, there is a fear that the end face of the resonator may be damaged by the plasma during the force processing which is to be subjected to the plasma processing during the dry etching, which may lead to poor reliability and the like.
- a semiconductor laser of the present invention comprises a substrate, a semiconductor layer provided on the substrate, having a cleavage plane that is not parallel to the cleavage plane of the substrate, and including a semiconductor laminated portion including an active layer; In the vicinity, at least a metal layer portion is provided between the substrate and the active layer.
- a material having a cleavage plane that is not parallel to the cleavage plane of the substrate means any material other than a material having a cleavage plane whose cleavage plane is parallel to the substrate. If not, this includes that any material may be used as long as the semiconductor laminated portion has a cleavage plane.
- Near the cavity end face means that it includes at least the cavity end face from which the laser light is emitted, and the metal layer portion may be formed in other areas.
- the metal layer portion includes atoms constituting a semiconductor laminated portion. This structure According to this method, it is possible to prevent the crystallinity of the active layer from deteriorating and prevent the manufacturing process from being complicated.
- a semiconductor laminated portion including an active layer is formed of a material having a cleavage plane whose cleavage plane is not parallel to the substrate, and then a part of the semiconductor laminated portion is formed.
- the method is characterized in that a metal layer is formed by melting and then cleaved at the metal layer to form a cavity end face.
- the metal layer portion is formed by melting by irradiating a laser beam from the back surface of the substrate opposite to the lamination surface of the semiconductor lamination portion. I do. As a result, the semiconductor laminated portion can be easily melted, and the manufacturing process is not complicated.
- the substrate and the active layer are not in direct contact. Therefore, when forming the cavity end face in accordance with the cleavage plane of the semiconductor laminated portion, cracks generated on the substrate are absorbed by the metal layer portion and do not propagate to the semiconductor laminated portion side, so that no crack is generated in the active layer. Therefore, the cavity end face of the active layer can be made a mirror surface.
- the end face of the resonator can be mirror-finished by dry etching or the like. Therefore, the end face loss can be reduced, and a semiconductor laser driven with low operating current can be obtained.
- the resonator end face is formed by cleavage in accordance with the metal layer portion, cracks generated on the substrate are absorbed by the metal layer portion and do not propagate to the semiconductor laminated portion. No cracking occurs in the semiconductor laminated portion. Therefore, the resonator end face of the semiconductor laminated portion can be made a mirror surface. Further, since a part of the semiconductor laminated portion is melted after the formation of the semiconductor laminated portion, a high quality semiconductor laminated portion can be obtained in which the already laminated semiconductor laminated portion is not affected at all.
- FIG. 1 is a perspective view of a semiconductor laser according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view of the semiconductor laser of FIG. 1 in a direction perpendicular to a cavity facet.
- FIGS. 3A-3C are views of the end face of the cavity of the semiconductor laser of FIG. 1 and other embodiments.
- FIG. 6 is a view of the resonator end face according to the embodiment.
- 4A to 4C are views showing a manufacturing process of the semiconductor laser according to the present invention, and are views showing a cross-sectional view perpendicular to the cavity facets.
- FIG. 5 is a diagram of a semiconductor laser according to an embodiment of the present invention as viewed from a cavity facet.
- FIG. 6 is a perspective view illustrating a conventional semiconductor laser.
- the semiconductor laser of the present invention has a substrate 1 and a nitride material having a cleavage plane not parallel to the cleavage plane of the substrate 1 on the substrate 1.
- the semiconductor laminated portion 9 is laminated, and a resonator end face 6 from which laser light is emitted is formed. And, near the resonator end face 6, there is a metal layer portion 5 between the substrate 1 and the active layer 4.
- the metal layer portion 5 is located between the substrate 1 and the active layer 4 near the resonator end face 6, and when cleaved, cracks generated from the substrate 1 are stacked on the semiconductor layer. It has a function of preventing the laminated portion, particularly, the active layer 4 from reaching.
- the vicinity of the resonator end face 6 means that it includes at least an end face portion from which laser light is emitted, and the metal layer portion 5 may be formed in other areas.
- the substrate 1 and the active layer 4 are not in direct contact. Therefore, as shown in FIG. 3A, where the cleavage face of the semiconductor laser in FIG. 1 is viewed from the cavity facet side, when the cleavage face of the semiconductor laminated portion 9 is the cavity facet 6, the difference between the cleavage face and the substrate is different.
- the cracks 11 generated by the metal layer portion 5 do not propagate into the upper semiconductor laminated portion 9 due to the presence of the metal layer portion 5. Therefore, the crack 11 does not occur in the semiconductor laminated portion 9 and the semiconductor laminated portion 9
- the active layer 4 can be made a mirror surface, and the absorption loss at the resonator end face 6 can be suppressed.
- the end face can be mirror-finished than an end face which is artificially processed by dry etching or the like, and the end face loss can be reduced, so that a semiconductor laser driven at low operating current can be obtained.
- the width T of the metal layer portion 5 in the laser resonator direction and the direction perpendicular to the stacking direction of the semiconductor stacked portion 9 is the same as the chip width C in the example shown in FIG. 3A, for example, as shown in FIG. 3B.
- the width T of the metal layer portion 5 may be smaller than the chip width C, but is preferably equal to or greater than the stripe width S of the mesa stripe portion that defines the current injection region. That is, if the crack 11 does not propagate to the region of the active layer 4 where the light density is high, there is almost no absorption loss at the cavity facet. The region where the light density is high is almost the same as the stripe width S, and the width T of the metal layer portion 5 inevitably reduces absorption loss if the width T is larger than that. It is.
- the metal layer portion 5 is a portion of the semiconductor laminated portion 9 in contact with the substrate, the metal layer portion 5 is not necessarily required.
- the metal layer portion 5 may be formed at any position of the layer up to the active layer 4.
- metal layer portion 5 preferably contains atoms constituting semiconductor laminated portion 9. According to this configuration, the crystallinity of the active layer 4 is prevented from deteriorating and the manufacturing process is facilitated. That is, in the case where the atoms constituting the semiconductor laminated portion 9 are included, the metal layer portion 5 can be formed by melting the semiconductor laminated portion 9 after growing the semiconductor laminated portion 9. Therefore, the quality of the semiconductor laminated portion 9 can be maintained without affecting the crystallinity of the semiconductor laminated portion 9 at all.
- the metal layer portion 5 containing the atoms constituting the semiconductor laminated portion 9 can be formed only by adding a process of melting a part of the semiconductor laminated portion 9 from the back surface of the substrate 1, and the manufacturing process Do not invite the complex Specifically, when the semiconductor laminated portion 9 also has an AlGaInN-based compound material power, Ga, Al, In or any of these materials can be used.
- the alloy becomes the metal layer portion 5 and other materials are used can be similarly considered. Note that, as described above, it is preferable to form the semiconductor laminated portion 9 after the growth thereof, but the present invention is not limited thereto.
- the substrate 1 is, for example, a sapphire substrate having a c-plane as a main surface, but is not limited thereto, and may be a sapphire substrate having another surface as a main surface. Further, substrate 1 may be an insulating substrate, a p-type or an n-type, and the material is not limited to sapphire, but may be a silicon carbide (SiC) substrate or other materials. Furthermore, since light is irradiated from the back surface by a YAG laser or the like as described later, a material that does not absorb the light emitted from the irradiation laser 13 is preferable.
- the semiconductor laminated portion 9 is made of a material having a cleavage plane parallel to the cleavage plane of the substrate 1, has the active layer 4, and is formed on the substrate 1.
- the material system of the semiconductor laminated portion 9 is not limited, in the case of a nitride material, it is easy to satisfy the requirement of a material having a cleavage plane not parallel to the cleavage plane of the substrate 1.
- a nitride material is Al Ga In N (0 ⁇ x ⁇ l, 0 ⁇ y ⁇ l, 0 ⁇ x
- the cleavage plane of GaN is generally an M-plane, whereas The cleavage plane of the planar sapphire substrate is also the M plane, but they are not parallel.
- the cleavage plane of the substrate is not parallel to the M plane, which is the cleavage plane of force GaN, which is the R plane. Therefore, anything having such a relationship is included in the scope of the present invention.
- a material having a cleavage plane whose cleavage plane is not parallel to the substrate means any material other than a material having a cleavage plane whose cleavage plane is parallel to the substrate.
- any material having a cleavage plane may be used. That is, when a substrate having a cleavage plane without a cleavage plane is used, the present invention is within the scope of the present invention regardless of what material is used for the semiconductor laminated portion 9.
- the first conductivity type semiconductor layer 2 and the second conductivity type semiconductor layer 3 are formed so as to sandwich the active layer 4, and it is preferable to form a double hetero junction from the viewpoint of improving luminous efficiency.
- the active layer 4 may be of any type, such as having a Balta structure or a structure such as a single quantum well or a multiple quantum well.
- a quantum well structure When a quantum well structure is adopted, a layer having a small band gap is used for the well layer, and a layer having a large band gap is used for the barrier layer.
- GaN is used for the well layer and GaN is used for the barrier layer. Layers and the like are used.
- the first conductive type semiconductor layer 2 is of an n-type or a p-type, and may be a single layer or a multilayer.
- the film thickness is appropriately adjusted as required.
- a force having a three-layer structure including an n-type GaN contact layer 2a, an n-type AlGaN cladding layer 2b, and an n-type GaN guide layer 2c is not necessarily required.
- it may be a single layer exhibiting both functions of the contact layer and the cladding layer. Further, it may have a superlattice structure, or may further have a layer having another function.
- a buffer layer 12 may be inserted between the first conductivity type semiconductor layer 2 and the substrate 1.
- the buffer layer 12 has a role of, for example, relieving lattice mismatch between the substrate and the first conductivity type semiconductor layer 2, and is preferably a material that also has an AlGaInN force, but is not limited thereto.
- the second conductivity type semiconductor layer 3 has a conductivity type opposite to that of the first conductivity type semiconductor layer 2 and may be a single layer or a multilayer, and the film thickness is appropriately adjusted as required. You. For example, in the embodiment shown in FIG. 5, ⁇ -type AlGa, ⁇ electron barrier layer 3a, p-type GaN guide layer 3b, p-type AlGaN
- It may be a single layer exhibiting both functions of a power contact layer and a clad layer having a four-layer structure that also has a power with the lad layer 3c and the p-type GaN contact layer 3d. Further, it may have a superlattice structure or may further have a layer having another function. Further, since the p-type semiconductor layers are often inactive only by being laminated, it is preferable to activate the p-type semiconductor layer in the semiconductor laminated portion 9 by annealing, for example. In the case of annealing, a protective film such as SiO or SiN is provided on the entire surface of the second conductivity type semiconductor layer 4 to perform the annealing.
- annealing conditions may be performed under necessary conditions that can be appropriately activated.
- the activation may be performed by a method other than annealing, or may be omitted when it is not particularly necessary to activate.
- Each of the active layer 4, the first conductivity type semiconductor layer 2, and the second conductivity type semiconductor layer 3 is an n-type layer.
- Se Se, Si, Ge, Te
- N easily evaporates at the time of film formation and naturally becomes n-type.
- the first electrode 7 is formed on a partially exposed surface of the first conductive type semiconductor layer 2, and the first electrode 7 is formed in a stripe shape.
- a second electrode 8 is formed on the uppermost surface of the second conductivity type semiconductor layer 3.
- the striped mesa etching and the formation of the exposed surface of the first conductivity type layer 2 are performed by dry etching such as reactive ion etching or the like in an atmosphere of a mixed gas of C12 and BC13.
- the first electrode 7 is electrically connected to the exposed surface of the first conductive semiconductor layer 2, and the second electrode 8 is electrically connected to the second conductive semiconductor layer 3.
- the layer in contact with each electrode is n-type, it is made of Ti / AU TiZAu or the like, and when it is p-type, it also has a force such as PdZAu or NiZAu, but these are not limited.
- the first electrode 7 is made of TiZAl on the contact layer 2a which also has an n-type GaN force, which is the exposed surface of the first conductivity type semiconductor layer 2, and the second electrode 8 is made of the second conductivity type semiconductor layer.
- Pd-ZAu is formed on the contact layer 3d, which also has p-type GaN power on the outermost surface of 3!
- FIGS. 4A-4B are cross-sectional views showing a manufacturing process according to the present invention as viewed from a direction perpendicular to an end face of the resonator.
- a semiconductor layer 9 having an active layer 4 made of a material having different cleavage planes is formed on a substrate 1, and then a part of the semiconductor layer 9 is melted to form a metal layer 5. Thereafter, the metal layer portion 5 is cleaved so as to be divided, and a resonator end face 6 is formed. Since the description is the same as that described above, the description is omitted here.
- a semiconductor laminate 9 having an active layer 4 and made of a material having a cleavage plane that is not parallel to the cleavage plane of the substrate 1 is formed on the substrate 1.
- These may be, for example, a force MBE method grown using a MOCVD method or the like, or may be another growth method.
- annealing treatment, stripe etching, mesa etching, electrode formation, lapping of the back surface of the substrate, and the like are appropriately performed.
- FIG. 4B a part of the semiconductor laminated portion 9 located between the substrate 1 and the active layer 4 is melted.
- the thickness of the melting region can be adjusted appropriately by adjusting the output of the laser, the irradiation time, and the like as described later.
- a part of the semiconductor laminated portion 9 is melted by an irradiation laser 13 such as a YAG laser or an excimer laser.
- an irradiation laser 13 such as a YAG laser or an excimer laser.
- the irradiation laser 13 has a longer wavelength than the wavelength corresponding to the band gap of the substrate 1 in order to avoid absorption of the substrate. Further, it is preferable to use a semiconductor laminated portion 9 having a shorter wavelength than the wavelength corresponding to the band gap than the material constituting the layer to be melted, since the desired layer can be surely melted. Further, if the wavelength is longer than the wavelength corresponding to the band gap of the active layer, no influence is exerted on the active layer.
- both a YAG laser and an excimer laser can be used.
- the light of the YAG laser is emitted from the AlGaN layer.
- the AlGaN layer cannot be melted. Therefore, in that case, it is necessary to use a laser having a shorter wavelength than the AlGaN layer, such as an excimer laser.
- a laser having a shorter wavelength than the AlGaN layer such as an excimer laser.
- the metal layer is formed only on the substrate side without affecting the active layer side. be able to.
- the cavity facet 6 from which laser light is emitted is formed by cleavage along the molten metal layer portion 5 using laser scribe, diamond scribe, or the like.
- W is not less than 10 / zm and not more than half of the resonator length L.
- FIG. 5 is a view of the semiconductor laser manufactured in the following example as viewed from the cavity end face direction.
- a buffer layer 12 of, for example, n-type GaN is grown on a sapphire substrate 1 by MOCVD using TMG, TMA, TMI, and NH3 as raw materials at a temperature of about 0.01-1.
- P-type GaN guide layer is about 0.01-1.0.3 m
- Strengthening cladding layer 3c 0.01-1
- a contact layer 3d made of p-type GaN is grown to a thickness of 0.05 to 2 m.
- an SiO protective film is provided on the entire surface of the contact layer 3d, and the temperature is 400 to 800 ° C, 20 - 60 minutes
- annealing When annealing is completed, reactive ion etching (dry etching) is performed in a mixed gas atmosphere of C12 and BC13 until a p-type cladding layer 3c is exposed by providing a mask such as a resist film, and etching is performed in a stripe shape. . Then, a mask is provided on the stripe portion with a resist film or the like, and dry etching is again performed until the n-type contact layer 2a is exposed, followed by mesa etching.
- dry etching dry etching
- a metal film such as Pd or Au is formed by sputtering or vapor deposition, and a second electrode 8 is formed on the p-type contact layer 3d, and a metal film such as Ti or Al is formed on the exposed n-type contact layer 2a.
- the first electrode 7 is formed by sputtering or vapor deposition.
- the substrate 1 is thinned by lapping the back surface of the substrate 1.
- the buffer layer 12 made of GaN is melted from the back surface of the substrate 1 using a YAG laser to form a metal layer portion 5 made of Ga.
- it is cleaved by scribing using diamond along the melted metal layer portion 5 to form a cavity facet 6, and the cavity facet 6 is subjected to sputtering or the like.
- a protection film (not shown) is provided.
- the direction of the cavity which is parallel to the emission direction, is also scribed and chipped to form a semiconductor laser.
- the GaN low-temperature buffer layer 12 is melted by using the YAG laser 11, and Ga, which is a constituent metal of the low-temperature buffer layer 12, is the metal layer portion 5.
- the metal layer portion 5 may be formed up to a part of the contact layer 2a, or any of the layers up to the active layer 4 may be melted to form the metal layer portion 5.
- the metal layer 5 is not limited to Ga, and may be an alloy of In and Ga or an alloy of A1 and Ga. ! / ,.
- a semiconductor laser having high characteristics can be obtained even when a cleavage plane between a substrate and a semiconductor layer to be laminated is not parallel, such as a semiconductor laser of a short wavelength such as a blue laser using a nitride semiconductor. Therefore, it can be used for pickup light sources such as CD, DVD, DVD-ROM, and CD-R / RW.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US10/578,477 US20070131939A1 (en) | 2003-11-12 | 2004-11-12 | Semiconductor laser and method for manufacturing the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003382954A JP3766085B2 (ja) | 2003-11-12 | 2003-11-12 | 半導体レーザ |
JP2003-382954 | 2003-11-12 |
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WO2005048420A1 true WO2005048420A1 (ja) | 2005-05-26 |
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PCT/JP2004/016872 WO2005048420A1 (ja) | 2003-11-12 | 2004-11-12 | 半導体レーザ及びその製法 |
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US (1) | US20070131939A1 (ja) |
JP (1) | JP3766085B2 (ja) |
KR (1) | KR20060114696A (ja) |
CN (1) | CN1879267A (ja) |
WO (1) | WO2005048420A1 (ja) |
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JP4845790B2 (ja) | 2007-03-30 | 2011-12-28 | 三洋電機株式会社 | 半導体レーザ素子およびその製造方法 |
JP2009032970A (ja) * | 2007-07-27 | 2009-02-12 | Rohm Co Ltd | 窒化物半導体素子の製造方法 |
CN111902913A (zh) * | 2018-03-29 | 2020-11-06 | 三菱电机株式会社 | 半导体装置的制造方法 |
Citations (2)
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JP2000244068A (ja) * | 1998-12-22 | 2000-09-08 | Pioneer Electronic Corp | 窒化物半導体レーザ及びその製造方法 |
JP2001284732A (ja) * | 2000-03-31 | 2001-10-12 | Matsushita Electric Ind Co Ltd | 多波長レーザ発光装置、当該装置に用いられる半導体レーザアレイ素子及び当該半導体レーザアレイ素子の製造方法 |
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US6555403B1 (en) * | 1997-07-30 | 2003-04-29 | Fujitsu Limited | Semiconductor laser, semiconductor light emitting device, and methods of manufacturing the same |
US6319742B1 (en) * | 1998-07-29 | 2001-11-20 | Sanyo Electric Co., Ltd. | Method of forming nitride based semiconductor layer |
EP1104031B1 (en) * | 1999-11-15 | 2012-04-11 | Panasonic Corporation | Nitride semiconductor laser diode and method of fabricating the same |
US6765232B2 (en) * | 2001-03-27 | 2004-07-20 | Ricoh Company, Ltd. | Semiconductor light-emitting device, surface-emission laser diode, and production apparatus thereof, production method, optical module and optical telecommunication system |
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2003
- 2003-11-12 JP JP2003382954A patent/JP3766085B2/ja not_active Expired - Fee Related
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2004
- 2004-11-12 KR KR1020067009189A patent/KR20060114696A/ko not_active Application Discontinuation
- 2004-11-12 US US10/578,477 patent/US20070131939A1/en not_active Abandoned
- 2004-11-12 CN CNA2004800332016A patent/CN1879267A/zh active Pending
- 2004-11-12 WO PCT/JP2004/016872 patent/WO2005048420A1/ja active Application Filing
Patent Citations (2)
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---|---|---|---|---|
JP2000244068A (ja) * | 1998-12-22 | 2000-09-08 | Pioneer Electronic Corp | 窒化物半導体レーザ及びその製造方法 |
JP2001284732A (ja) * | 2000-03-31 | 2001-10-12 | Matsushita Electric Ind Co Ltd | 多波長レーザ発光装置、当該装置に用いられる半導体レーザアレイ素子及び当該半導体レーザアレイ素子の製造方法 |
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US20070131939A1 (en) | 2007-06-14 |
JP3766085B2 (ja) | 2006-04-12 |
KR20060114696A (ko) | 2006-11-07 |
CN1879267A (zh) | 2006-12-13 |
JP2005150255A (ja) | 2005-06-09 |
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