WO2005074047A1 - 光半導体素子およびその製造方法 - Google Patents
光半導体素子およびその製造方法 Download PDFInfo
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- WO2005074047A1 WO2005074047A1 PCT/JP2005/000288 JP2005000288W WO2005074047A1 WO 2005074047 A1 WO2005074047 A1 WO 2005074047A1 JP 2005000288 W JP2005000288 W JP 2005000288W WO 2005074047 A1 WO2005074047 A1 WO 2005074047A1
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- H01S5/3434—Structure or shape of the active region; Materials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers in AIIIBV compounds, e.g. AlGaAs-laser, InP-based laser with a well layer comprising at least both As and P as V-compounds
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- H01S5/34346—Structure or shape of the active region; Materials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers in AIIIBV compounds, e.g. AlGaAs-laser, InP-based laser characterised by the materials of the barrier layers
- H01S5/34373—Structure or shape of the active region; Materials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers in AIIIBV compounds, e.g. AlGaAs-laser, InP-based laser characterised by the materials of the barrier layers based on InGa(Al)AsP
Definitions
- the present invention relates to an optical semiconductor device and a method for manufacturing the same, and more particularly, to an optical semiconductor device having a window region in which an active layer is interrupted near an end face and used as a semiconductor optical amplifier or a variable wavelength light source device, and a method for manufacturing the same. It is about.
- a semiconductor optical amplifier using a semiconductor light emitting device is roughly classified into a resonant semiconductor optical amplifier and a traveling wave semiconductor optical amplifier.
- a resonance type semiconductor optical amplifier uses a semiconductor laser biased below a threshold.
- the end face reflectivity of both end faces of a semiconductor laser is suppressed using means such as an AR coating or a window end face structure.
- the traveling-wave semiconductor optical amplifier is more advantageous than the resonant semiconductor optical amplifier because the gain fluctuation with respect to the input light wavelength fluctuation and the saturation gain intensity with respect to the increase in the input light intensity are large.
- the end face reflectance is suppressed by adopting a window end face structure having a window region in which the active layer is interrupted near the end face.
- FIG. 13 is a schematic diagram of a conventional traveling-wave semiconductor optical amplifier having a window end face structure in which the active layer is interrupted near the end face, for example, a semiconductor optical amplifier as disclosed in Patent Document 1 below. A perspective view is shown.
- FIG. 14 is a partially enlarged view of a window end face structure portion of the semiconductor optical amplifier shown in FIG.
- the configuration of a semiconductor optical amplifier having a window end face structure will be described along the procedure of its manufacturing process with reference to FIGS. 13 and 14.
- a non-doped InGaAsP active layer 52, an anti-melt back layer (AMB layer) 53, and a p-InP clad layer 54 are formed on a top surface of an n-InP substrate 51 by a liquid phase epitaxy (LPE) method.
- LPE liquid phase epitaxy
- a circular groove 60 having a width of 4 ⁇ m and a depth of 1.5 ⁇ m, which is continuous with the grooves 56 and 57 and has no mesa stripe 58, is formed.
- the length of the window region 59 is 50 ⁇ m.
- j-jet of 1 m, 0.5 m, 2 m, and 0.5 m thickness in flat part Crystal growth by LPE method.
- a 3000 angstrom thick SiO film 65 is formed by CVD.
- an electrode 66 made of CrZAu is formed so as to cover the SiO film 65 and the window of the SiO film 65.
- an electrode 67 made of AuGeN is formed under the n-InP substrate 51.
- the end surfaces on the active region 55 side and the window region 59 side are formed to a thickness of 2 by plasma CVD.
- the SiN films 68 and 69 of 200 angstrom are formed.
- a window structure in which the active layer is interrupted near the end face is effective, but the layer thickness on the p side with respect to the length of the window region is effective. Has been made thinner.
- the length of the window region 59 is
- the thickness of the ⁇ -InP buried layer 63 is reduced to about 2 ⁇ m with respect to 50 ⁇ m.
- Patent Document 1 a configuration of a semiconductor optical amplifier disclosed in Patent Document 1 as an optical semiconductor device for solving the above problem will be described along a procedure of a manufacturing process thereof.
- a non-doped InGaAsP active layer 52, an anti-melt back layer (AMB layer) 53, and a p-InP cladding layer 54 are formed on the upper surface of an n-InP substrate 51 by a liquid phase epitaxy (LPE) method.
- LPE liquid phase epitaxy
- a groove 60 having a width of 4 ⁇ m and a depth of 1.5 m is formed without the mesa stripe 58, continuing from the grooves 56 and 57.
- the length of the window region 59 is 30 ⁇ m.
- a p-InP current blocking layer 61 and an n-InP current blocking layer 62 are formed on the semiconductor multi-layer crystal except for an upper portion of the mesa stripe 58, and a p-InP buried layer 63 and a wavelength
- the p + -InGaAsP contact layer 64 of composition 1 and the force are grown by the LPE method in j-jets with a thickness of 1 m, 0.5 m, 6 m, and 0.5 m at the flat part, respectively.
- the thickness of the p-InP buried layer 63 is determined by considering that the diameter of the beam spot of light emitted from the active layer 52 at the end face is 11 ⁇ m, 5. 6 ⁇ m, which is equal to or greater than ⁇ . [0033] On the contact layer 64, a 3000 angstrom thick SiO film 65 is formed by CVD.
- an SiO film 65 and an electrode 66 made of CrZAu are formed so as to cover the window of the SiO film 65.
- an electrode 67 made of AuGeN is formed under the n-InP substrate 51.
- N films 68 and 69 are formed.
- the thickness of the p-InP buried layer 63 is
- the diameter of the light beam emitted from 2 is larger than the radius of the beam spot, light scattering by the electrode near the window end surface is eliminated, and good coupling efficiency can be obtained in the coupling using the self-occurring lens.
- the optical amplification gain between fibers of B can be obtained.
- the change in amplification factor is as small as 2 dB.
- Patent Document 1 Japanese Unexamined Patent Application Publication No. 1-321675 (Patent No. 2643319)
- light emitted from the active layer 52 in the window end structure has an upper electrode 66.
- the layer thickness is made as thick as 6 m, which is not less than 5.5 m in radius of the beam spot of the light emitted from the active layer 52.
- the semiconductor optical amplifier disclosed in Patent Document 1 requires time for vapor-phase growth of the p-InP buried layer 63 that not only increases the thickness of the entire optical semiconductor element, but also There is a problem that extra time is required for manufacturing the entire semiconductor device, resulting in high cost.
- the present invention has been made in view of the above problems, and has been made in order to realize an optical semiconductor device capable of easily suppressing the influence of interference in a window region where an active layer is interrupted near an end face.
- an optical semiconductor device capable of easily suppressing the influence of interference in a window region where an active layer is interrupted near an end face.
- the light generated in the active layer causes unwanted scattering and diffraction in the window region.
- the generation of undesired reflected light is suppressed as described above, and the thickness of the p-side cladding layer is not increased as in the conventional case, and the reflected light from the electrode does not require manufacturing time or increases the cost.
- An object of the present invention is to provide an optical semiconductor device capable of effectively suppressing the influence of interference and a method for manufacturing the same.
- the refractive index of the n-type first cladding layer (6) is adjusted so that the electric field intensity distribution of light generated in the active layer (7) is biased toward the n-type first cladding layer (6).
- n is the refractive index of the p-type second cladding layer
- n is the refractive index of the n-type first cladding layer (6).
- the length of the window area (4a, 4b) is set to a length that allows the beam spot size at the element end face (la, lb) having the window area (4a, 4b) to be increased.
- the n-type first cladding layer (6), the active layer (7), and the p-type second cladding A mesa stripe portion (3) in which a part of each layer of the layer (8) is formed in a mesa shape;
- a third p-type cladding layer (11) that commonly covers an upper surface of the mesa stripe portion (3) and an upper surface of the current block portion (5);
- the refractive index of each of the first SCH layer (16) and the second SCH layer (17) is set higher than the refractive index of the n-type first cladding layer (6).
- the active layer (7) includes a plurality of MQWs (Multi Quantum Wells) including a plurality of well layers and a plurality of barrier layers located on both sides of each well layer in the plurality of well layers.
- An optical semiconductor device according to a fourth aspect, comprising a (well) structure, is provided. [0047] To achieve the above object, according to a sixth aspect of the present invention,
- the first SCH layer (16) includes a multilayer structure including a plurality of layers
- the optical semiconductor device according to the fifth aspect is provided, wherein the second SCH layer (17) has a multilayer structure including a plurality of layers.
- the refractive indices of the plurality of barrier layers in the active layer (7), the plurality of layers in the first SCH layer (16), and the plurality of layers in the second SCH layer (17) are large.
- the small relationship is that the refractive index na of the n-type first cladding layer (6), in which the refractive index of the plurality of barrier layers in the active layer (7) is the highest, is the p-type second cladding layer (6).
- the optical semiconductor device according to the sixth aspect characterized in that the optical semiconductor device is set so as to become smaller as the distance from the active layer (7) is increased, including the relationship higher than the refractive index nb of 8). You.
- the n-type first clad layer (6), the first SCH layer (16), the active layer (7), the second SCH layer (17), and the p-type second clad layer ( 8) a mesa stripe part (3) in which a part of each layer is formed in a mesa shape;
- a third p-type cladding layer (11) that commonly covers an upper surface of the mesa stripe portion (3) and an upper surface of the current block portion (5);
- the optical semiconductor device according to the seventh aspect further comprising: [0050] To achieve the above object, according to a ninth aspect of the present invention,
- At least one end face of both end faces (3a, 3b) of the mesa stripe portion (3) has a predetermined shape with respect to a longitudinal direction which is an output direction of light (21) generated in the active layer (7).
- a semiconductor element is provided.
- the optical semiconductor device according to the third or eighth aspect is provided, wherein the mesa stripe portion (3) has an arrangement structure inclined at a predetermined angle in a longitudinal direction thereof.
- the window regions (4a, 4b) are formed on both light emitting end faces of the active layer (7) as window regions (4a), one of which is coupled to an optical fiber, and the other is a window region which is not coupled to an optical fiber. Formed as (4b),
- the window region (4b), which is not coupled to the optical fiber, is formed to have a longer region length than the window region (4a) coupled to the optical fiber,
- the mesa stripe portion (3) is formed as a superluminescent diode because the longitudinal direction of the mesa stripe portion (3) is formed at right angles to the surface of the antireflection film (15a) which is the output end surface.
- the window regions (4a, 4b) are formed on both light emitting end faces of the active layer (7) as window regions (4a), one of which is coupled to an optical fiber, and the other is a window region which is not coupled to an optical fiber. Formed as (4b),
- the window region (4b), which is not coupled to the optical fiber, is formed to have a longer region length than the window region (4a) coupled to the optical fiber,
- the longitudinal direction of the mesa stripe portion (3) is partially or entirely inclined at a predetermined angle so that the output light has a non-perpendicular angle with respect to the surface of the antireflection film (15a) which is the output end face.
- the optical semiconductor device according to the third or eighth aspect is provided, which is applied as a superluminescent diode.
- the window regions (4a, 4b) are formed as window regions (4a) only on one of the two light emitting end surfaces of the active layer (7).
- One end face (3a) of the mesa stripe portion (3) is located inside the opposing end face (la) of the optical semiconductor element (1) by the window area (4a), and the active layer (7 ) Is inclined at a predetermined angle to the output direction of the light (21) generated by
- the other end surface (3d) of the mesa stripe portion (3) has no window region formed, and is exposed to the opposite end surface (lb) of the optical semiconductor element (1).
- An optical semiconductor device according to the third or eighth aspect is provided, which is formed perpendicular to the longitudinal direction of the semiconductor device (1).
- the refractive index of the n-type first cladding layer (6) is set to na
- the refractive index of the p-type second cladding layer (8) is set to be biased toward the first cladding layer (6).
- the refractive index na of the n-type first cladding layer (6) is set to be higher than the refractive index nb of the P-type second cladding layer (8).
- a method for manufacturing an optical semiconductor device is provided.
- the length of the window area (4a, 4b) is set to a length that allows the beam spot size at the element end face (la, lb) having the window area (4a, 4b) to be increased.
- a method for manufacturing an optical semiconductor device according to a fourteenth aspect is provided. [0057] To achieve the above object, according to a sixteenth aspect of the present invention,
- each of the n-type first cladding layer (6), the active layer (7), and the p-type second cladding layer (8) is formed in a mesa shape as a mesa stripe portion (3).
- a non-reflection film (15a, 15b) is formed on an element end face (la, lb) having the window region (4a, 4b) of the optical semiconductor element (1) cut out by cleavage as the optical semiconductor element (1).
- first SCH Separatate Confinement Heterostructure layer (16) having an InGaAsP force between the active layer (7) and the n-type first cladding layer (6);
- the refractive index of each layer constituting the first SCH layer (16) and the second SCH layer (17) is set higher than the refractive index of the n-type first cladding layer (6).
- the active layer (7) includes a plurality of MQWs (Multi Quantum Wells) including a plurality of well layers and a plurality of barrier layers located on both sides of each well layer in the plurality of well layers.
- MQWs Multi Quantum Wells
- the first SCH layer (16) includes a multilayer structure including a plurality of layers
- the method for manufacturing an optical semiconductor device according to an eighteenth aspect is provided, wherein the second SCH layer (17) has a multilayer structure including a plurality of layers.
- the refractive indices of the plurality of barrier layers in the active layer (7), the plurality of layers in the first SCH layer (16), and the plurality of layers in the second SCH layer (17) are large.
- the small relationship is that the refractive index na of the n-type first cladding layer (6), in which the refractive index of the plurality of barrier layers in the active layer (7) is the highest, is the p-type second cladding layer (6).
- the method of manufacturing an optical semiconductor device according to the nineteenth aspect characterized in that the distance from the active layer (7) is set to be smaller, including the relation higher than the refractive index nb of (8). Is provided.
- a non-reflection film (15a, 15b) is formed on an element end face (la, lb) having the window region (4a, 4b) of the optical semiconductor element (1) cut out by cleavage as the optical semiconductor element (1).
- a method for manufacturing an optical semiconductor device according to the twentieth aspect further comprising the steps of:
- the step of forming the mesa stripe portion (3) includes:
- the n-type first cladding layer (6), the active layer (7), the p-type second cladding layer (8), and the cap layer (32) are etched once by the semiconductor substrate.
- It has a predetermined length L along the longitudinal direction, and at least one end face of both end faces (3a, 3b) has a length a.
- At least one end face of both end faces (3a, 3b) of the mesa stripe portion (3) has a predetermined shape with respect to a longitudinal direction which is an output direction of light (21) generated in the active layer (7).
- An optical semiconductor device characterized in that the optical semiconductor device is inclined at an angle ⁇ and is formed at an acute angle inclined at a predetermined angle ⁇ ⁇ ⁇ ⁇ with respect to a direction orthogonal to the long direction. A manufacturing method is provided.
- the step of forming the mesa stripe portion (3) includes:
- a cap layer (32) is provided on the upper surface of the ⁇ -shaped second cladding layer (8), a predetermined length S and a predetermined
- the clad layer (8) and the cap layer (32) have a predetermined length La along the longitudinal direction on the semiconductor substrate (2) by one etching, and the end faces (3a, 3b ) Is inclined with respect to the elongate direction (the emission direction of laser light), Forming a mesa stripe portion (3) inclined with respect to a direction orthogonal to the longitudinal direction,
- At least one end face of both end faces (3a, 3b) of the mesa stripe portion (3) has a predetermined shape with respect to a longitudinal direction which is an output direction of light (21) generated in the active layer (7).
- the optical semiconductor device according to the twenty-first aspect characterized in that the optical semiconductor device is inclined at an angle ⁇ and is formed at an acute angle that is inclined at a predetermined angle ⁇ with respect to a direction orthogonal to the long direction.
- the step of forming the mesa stripe portion (3) includes:
- An optical semiconductor device comprising a step of forming the mesa stripe portion (3) in an elongated structure at a predetermined angle in the longitudinal direction thereof. Is provided.
- the other light emitting end face of both light emitting end faces of the active layer (7) is longer than the area length of the window area (4a).
- the mesa stripe portion (3) Since the long direction of the mesa stripe portion (3) is formed at right angles to the surface of the antireflection film (15a), which is an output end surface, the mesa stripe portion (3) is applied as a superluminescent diode. And a method for manufacturing an optical semiconductor device according to the sixteenth or twenty-first aspect.
- the window region (4a) is provided on the other light emitting end face of the two light emitting end faces of the active layer (7). Forming a window region (4b) without coupling with an optical fiber having a region length!
- the longitudinal direction of the mesa stripe portion (3) is partially or wholly set so that the output light has a non-perpendicular angle with respect to the surface of the antireflection film (15a) which is the output end face.
- window region (4a, 4b) Forming the window region (4a, 4b) as a window region (4a) only on at least one of the two light emitting end surfaces of the active layer (7);
- One end face (3a) of the mesa stripe portion (3) is located inside the opposite end face (la) of the optical semiconductor element (1) by the window area (4a), and the active layer (7 ), The light being generated at a predetermined angle with respect to the output direction of the light (21);
- the other end surface (3d) of the mesa stripe portion (3) is exposed to the opposite end surface (lb) of the optical semiconductor device (1) without a window region, and the light is exposed to the light. Forming the semiconductor device (1) perpendicular to the longitudinal direction of the semiconductor device (1).
- the semiconductor substrate (2), the n-type first cladding layer (6), the active layer (7), and the p-type second cladding layer (8) are to be manufactured in the longitudinal direction, respectively.
- the window regions (4a, 4b) are twice as long as the optical semiconductor device (1), and the window regions (4a, 4b) are respectively formed on both light emitting end faces of the active layer (7),
- the n-type first cladding layer (6), the active layer (7), the p-type second cladding layer (8), and the cap layer (32) are etched once by the semiconductor substrate.
- (2) having a length corresponding to twice the length of the optical semiconductor device (1) to be manufactured, along the long direction;
- a mesa stripe portion (3) in which both end surfaces are inclined at a predetermined inclination angle ⁇ 8 with respect to the elongate direction and at a predetermined inclination angle ⁇ ⁇ ⁇ ⁇ with respect to a direction orthogonal to the elongate direction.
- the mesa stripe portion (3) of the optical semiconductor device (1A) having a length twice as long as the optical semiconductor device (1) to be manufactured is divided into two parts by a cleavage method at a central portion in the longitudinal direction.
- FIG. 1 is a perspective view showing a schematic configuration of a semiconductor device according to the present invention.
- FIG. 2 ⁇ is a top view showing a schematic configuration of the optical semiconductor device of FIG.
- FIG. 2 ⁇ is a front view showing a schematic configuration of the optical semiconductor device of FIG. 1;
- FIG. 2C is a side view showing a schematic configuration of the optical semiconductor device of FIG. 1.
- FIG. 2D is a top view showing a modification of the mesa stripe portion in FIG. 1.
- FIG. 3 is a cross-sectional view of the optical semiconductor device of FIG.
- FIG. 4 is a cross-sectional view of the optical semiconductor device of FIG. 1 when an end region is cut along line IV-IV.
- FIG. 5 ⁇ is a diagram showing wavelength characteristics of a conventional semiconductor light emitting device.
- FIG. 5 ⁇ is a diagram showing wavelength characteristics of an optical semiconductor device according to the present invention.
- FIG. 6 ⁇ is a view showing a light distribution characteristic of the optical semiconductor device according to the present invention.
- FIG. 6 ⁇ is a partially enlarged sectional view of a window structure of the optical semiconductor device according to the present invention.
- FIG. 7 ⁇ is a top view showing a schematic configuration of another embodiment of the optical semiconductor device according to the present invention.
- FIG. 7 ⁇ is a front view showing a schematic configuration of another embodiment of the optical semiconductor device according to the present invention.
- FIG. 7C is a left side view showing a schematic configuration of another embodiment of the optical semiconductor device according to the present invention.
- FIG. 7D is a right side view showing a schematic configuration of another embodiment of the optical semiconductor device according to the present invention.
- FIG. 7E is a schematic view of a wavelength tunable light source device using the optical semiconductor element of FIG. 7A.
- FIG. 8A is a manufacturing process diagram showing a method of manufacturing an optical semiconductor element according to the present invention.
- FIG. 8B is a manufacturing process diagram showing the method for manufacturing the optical semiconductor device according to the present invention.
- FIG. 8C is a manufacturing process diagram showing the method for manufacturing the optical semiconductor device according to the present invention.
- FIG. 8D is a manufacturing step diagram showing a modification of the method for manufacturing an optical semiconductor device according to the present invention.
- FIG. 9A is a manufacturing process diagram showing the method for manufacturing the optical semiconductor device according to the present invention.
- FIG. 9B is a manufacturing process diagram showing the method for manufacturing the optical semiconductor device according to the present invention.
- FIG. 9C is a manufacturing process diagram showing the method for manufacturing the optical semiconductor device according to the present invention.
- FIG. 9D is a manufacturing step diagram showing a modification of the method for manufacturing an optical semiconductor device according to the present invention.
- FIG. 10A is a manufacturing process diagram showing the method for manufacturing the optical semiconductor device according to the present invention.
- FIG. 10B is a manufacturing process diagram showing the method for manufacturing the optical semiconductor device according to the present invention.
- FIG. 10C is a manufacturing process diagram showing the method for manufacturing the optical semiconductor device according to the present invention.
- FIG. 10D is a manufacturing process diagram showing the method for manufacturing the optical semiconductor device according to the present invention.
- FIG. 11 is a cross-sectional view showing another configuration of the mesa stripe portion of the optical semiconductor device according to the present invention.
- FIG. 12A is a top view showing a modified example of the optical semiconductor device according to the present invention.
- FIG. 12B is a top view showing a modification of the optical semiconductor device according to the present invention.
- FIG. 12C is a top view showing a modified example of the optical semiconductor device according to the present invention.
- FIG. 13 is a schematic perspective view of a conventional semiconductor optical amplifier disclosed in Patent Document 1.
- FIG. 14 is a partially enlarged sectional view of a window structure of the semiconductor optical amplifier of FIG.
- FIG. 15 is a schematic perspective view of another conventional semiconductor optical amplifier disclosed in Patent Document 1.
- FIG. 1 is a perspective view schematically showing a configuration of an optical semiconductor device according to Example 1 of the present invention.
- FIGS. 2A to 2C are a top view, a front view, and a side view, respectively, showing a schematic configuration of the optical semiconductor device of FIG. 1.
- FIG. 2D is a top view showing a modification of the mesa stripe portion as a configuration of a main portion in the optical semiconductor device of FIG.
- FIG. 3 is a cross-sectional view of the optical semiconductor device of FIG. 1 taken along the line III-III at the center.
- FIG. 4 is a cross-sectional view of the optical semiconductor device of FIG. 1 when an end region is cut along line IV-IV.
- FIG. 5A is a diagram showing wavelength characteristics of a conventional semiconductor light emitting device.
- FIG. 5B is a diagram showing wavelength characteristics of the optical semiconductor device according to the present invention.
- FIG. 6A is a diagram showing light distribution characteristics of the optical semiconductor device according to the present invention.
- FIG. 6B is a partially enlarged cross-sectional view of the window structure portion of the optical semiconductor device according to the present invention.
- the basic configuration of the semiconductor device according to the present invention is as follows: a semiconductor substrate 2 made of InP; An active layer 7 formed in parallel with the upper surface 2a of the semiconductor substrate 2; An n-type first cladding layer 6 having an InGaAsP force and at least one of the two light emitting end faces of the active layer 7 are formed between the light emitting end faces and the element end faces la and lb. Window regions 4a and 4b, and the n-type first cladding layer 6 is formed so that the distribution of light generated in the active layer 7 is biased toward the n-type first cladding layer 6 side.
- the refractive index na of the n-type first cladding layer 6 is that of the p-type second cladding layer 8.
- the relationship is set so that na> nb, which is higher than the refractive index nb! /
- FIGS. 1 to 4 A specific configuration of the semiconductor device according to the present invention is shown in FIGS. 1 to 4 as a schematic configuration of the semiconductor device according to the first embodiment.
- the window structure in which the active layer is cut off near the end face is formed only at one end or at both ends, and the semiconductor optical amplifier, the wavelength tunable light source device, the sonoluminum It is used for luminescent diodes (Super Luminescent Diode, hereinafter referred to as SLD).
- SLD Super Luminescent Diode
- the optical semiconductor device 1 according to Example 1 has a substantially rectangular parallelepiped shape as shown in FIG. 1 and FIGS. 2A to 2D, and is an n-type InP substrate doped with an n-type impurity. 2 is formed at the bottom.
- a mesa stripe portion 3 having a trapezoidal cross section along the longitudinal direction of the optical semiconductor element 1 on the upper surface 2a of the n-type InP substrate 2 is formed along the ⁇ 011> direction.
- the window regions 4a, 4a are provided between the longitudinal end surfaces 3a, 3b of the mesa stripe portion 3 and the longitudinal end surfaces la, lb of the optical semiconductor device 1, respectively. 4b is formed
- the end faces 3a and 3b of the mesa stripe portion 3 are inclined at a predetermined inclination angle j8 with respect to the ⁇ 011> direction, that is, the elongate direction. It is tilted at a predetermined tilt angle ⁇ ⁇ ⁇ ⁇ with respect to the orthogonal direction ( ⁇ 100> direction).
- FIG. 3 is a cross-sectional view of the optical semiconductor device 1 shown in FIG. 1 when a central portion is cut along a line III-III orthogonal to the longitudinal direction.
- a trapezoidal mesa stripe portion 3 is formed along the ⁇ 011> direction at the center of the upper surface 2a of an n-type InP substrate 2 doped with an n-type impurity having a (100) crystal plane as an upper surface. Being done.
- a current block 5 is formed outside the mesa stripe 3 on the upper surface 2 a of the n-type InP substrate 2.
- the concentration of the n-type impurity is 1.0 in contact with the n-type InP substrate 2.
- An n-type first cladding layer 6 of X 10 18 cm— 3 is formed.
- the n-type first cladding layer 6 is composed of a quaternary material (In, Ga, As, P) having a high refractive index, and has a p-type second cladding layer whose refractive index is described later. 8 higher than the refractive index of 8
- An active layer 7 is formed above the n-type first cladding layer 6.
- the active layer 7 has a non-doped InGaAsP, a non-doped InGaAsP, or a multiple quantum well structure composed of a combination thereof.
- the second cladding layer 8 concentration of the p-type impurity of the p-type is 5 to 7 X 10 17 cm- 3 is formed.
- the inclination angle of the side surface 3c in contact with the current block portion 5 of the mesa stripe portion 3 is set to an angle separated by a small angle ⁇ 0 with respect to an angle 0 of 54.7 ° at which the (lll) B crystal plane is exposed. It has been.
- the minute angle ⁇ 0 is set to ⁇ (1 ° to 5 °)
- the inclination angle of the side surface 3c of the mesa stripe portion 3 in contact with the current block portion 5 becomes 49.3 ° to 53.7 ° or 55.7 to 59.7.
- the (100) crystal face is exposed on the upper surface of the upper surface 2a of the n-type InP substrate 2 which is in contact with the current block portion 5.
- the current block portions 5 located on both sides of the mesa stripe portion 3 are formed of a P-type current block layer 9 formed of a p-type InP positioned on the lower side and an n-type InP positioned on the upper side. And an n-type current blocking layer 10 formed as described above.
- the tip 9a of the p-type current blocking layer 9 located on the lower side is located above the upper surface of the mesa stripe portion 3.
- the p-type current blocking layer 9 contains Zn or Cd as a p-type impurity.
- the n-type current block layer 10 located on the upper side contains Si as an n-type impurity.
- a p-type third cladding layer 11 having a p-type impurity concentration of 1.0 ⁇ 10 18 cm ⁇ 3 is formed.
- a p-type contact layer 12 made of InGaAsP is formed above the p-type third cladding layer 11.
- An electrode (p electrode) 13 is attached to the upper surface of the p-type contact layer 12.
- an electrode (n-electrode) 14 is also attached below the n-type InP substrate 2.
- the second cladding layer 8 is exposed.
- FIG. 4 is a cross-sectional view of the optical semiconductor element 1 shown in FIG. 1 when one of the window regions 4b in the long direction is cut along a line IV-IV orthogonal to the long direction.
- the mesa stripe portion 3 and the end surfaces 3a and 3b do not exist in the window region 4b.
- a current block section 5 is formed over the entire upper surface 2 a of the n-type InP substrate 2.
- the current block section 5 includes a p-type current block layer 9 formed of p-type InP positioned below and an n-type current block layer 10 formed of n-type InP positioned above. It consists of:
- a third p-type cladding layer 11 is formed over the entire upper surface of the n-type current block layer 10 in the current block section 5 to cover these upper surfaces.
- a p-type contact layer 12 is formed above the p-type third cladding layer 11.
- An electrode (p electrode) 13 is attached to the upper surface of the p-type contact layer 12.
- an electrode (n-electrode) 14 is also attached below the n-type InP substrate 2.
- antireflection films 15a and 15b are formed on end faces la and lb (see Fig. 1 and Figs. 2A to 2E).
- the cross-sectional shape when cut along the line IV-IV in FIG. 1 shown in FIG. 4 is equal to the shape of the end faces la and lb of the optical semiconductor element 1 shown in FIGS. 1, 2A to 2D. .
- the current block 5 is exposed at the end faces la and lb in the longitudinal direction of the optical semiconductor element 1, but is not exposed at the end faces 3a and 3b of the mesa stripe section 3.
- a current block layer 5 composed of a p-type current block layer 9 and an n-type current block layer 10 exists.
- the laser light generated in the active layer 7 is output as the laser light 21 in the longitudinal direction shown by the arrows in FIGS. 1, 2A to 2D.
- the laser light 21 output from the active layer 7 is emitted from the end faces 3a and 3b of the mesa stripe portion 3 through the current block layer 5 located outside the end faces 3a and 3b in the longitudinal direction. Output from the end faces la and lb of the semiconductor device 1 to the outside.
- the end surfaces 3 a and 3 b of the mesa stripe portion 3 from which the laser light 21 is output are closer to the long end surfaces la and lb of the optical semiconductor device 1 than the window. It is located inside by the area 4a and 4b.
- the end surfaces 3a and 3b of the mesa stripe portion 3 have a predetermined inclination angle
- the laser beam 21 emitted from the active layer 7 of the mesa stripe portion 3 is The force partially reflected by the end surfaces 3a and 3b inclined by the angle j8 with respect to the direction.
- the reflected laser light 21 does not return to the original path.
- optical semiconductor device 1 excellent wavelength characteristics ⁇ ( ⁇ ) of optical power can be obtained without a large fluctuation within a wide wavelength range.
- Fig. 5 ⁇ shows the wavelength characteristics of the measured optical power of a conventional optical semiconductor device having a window structure.
- FIG. 5A shows the wavelength characteristic ⁇ ( ⁇ ) of the optical power actually measured in the optical semiconductor device 1 according to the first embodiment of the present invention shown in FIG. /
- the ⁇ -type cladding layer 6 has a higher refractive index than that of the ⁇ -type cladding layer 8 and is made of InGaAsP! As shown in FIG. 6A, the electric field intensity distribution of the laser light generated in the active layer 7 is different from the characteristic a when the cladding layers 6 and 8 have the same refractive index. As shown in FIG. 6A, the electric field intensity distribution of the laser light generated in the active layer 7 is different from the characteristic a when the cladding layers 6 and 8 have the same refractive index. As shown in FIG.
- the refractive index of the n-type first cladding layer 6 is na
- the refractive index of the p-type second cladding layer 6 is Assuming that the refractive index of 8 is nb, the refractive index na of the n-type first cladding layer 6 is set higher than the refractive index nb of the p-type second cladding layer 8 such that na> nb.
- the electric field intensity distribution of light generated in the active layer 7 is biased toward the n-type first cladding layer 6.
- the direct light 21 generated in the active layer 7 is directed to the outside only within the window regions 4a and 4b shown by the thick lines in the drawing.
- the dashed line in the drawing scattering and diffraction do not occur above the window regions 4a and 4b, thereby suppressing the generation of undesired reflected light, and the reflected light in the window regions 4a and 4b. And the effect of interference with direct light can be suppressed.
- the predetermined length L of the window regions 4a and 4b is substantially equal to the beam spot size of the reflected light portion.
- the distribution of light generated in active layer 7 is closer to n-type cladding layer 6 side. Because of the bias, the thickness of the p-type cladding layer 8 can be reduced, so that the formation time of the p-type cladding layer 8 can be shortened, and the manufacturing cost of the optical semiconductor device 1 as a whole can be reduced. Reduction can be achieved.
- the mesa strip portion 3 may be arranged in a longitudinal direction and inclined at a predetermined angle!
- the laser light 21 reflected by the end faces 3a and 3b of the mesa stripe portion 3 has a more original path than the arrangement structure in the case where the laser light 21 is not inclined at a predetermined angle in the longitudinal direction.
- FIG. 7A to 7D are a top view, a front view, a left side view, and a right side view, respectively, showing a schematic configuration of another embodiment of the optical semiconductor device according to the present invention.
- FIG. 7E is a schematic diagram of a wavelength tunable light source device using the optical semiconductor element of FIG. 7A.
- one (left side in the drawing) end surface 3a of the mesa stripe portion 3 formed in the optical semiconductor device 1 is an optical semiconductor device. It is located on the inner side of the end face la of the semiconductor element 1 by the window area 4a, and is inclined at a predetermined angle ⁇ in the output direction of the laser beam 21.
- the window region 4b is not formed, and the end face 3d is exposed to the right end face lb of the optical semiconductor element 1.
- the other (right side in the figure) end face 3 d of the mesa stripe portion 3 is perpendicular to the longitudinal direction of the optical semiconductor element 1.
- one of the pair of end surfaces 3 a and 3 d located on both sides of the mesa stripe portion 3 is inclined with respect to the output direction of the laser light 21. Therefore, no optical resonator is formed in the mesa stripe portion 3.
- the wavelength tunable light source device using the optical semiconductor element 1 the light emitted from one end face la (lb) of the optical semiconductor element 1 in the longitudinal direction is converted into a diffraction grating 31.
- the desired laser light 21 is extracted by feedback using a wavelength selecting means such as the above.
- FIG. 7E other embodiments such as a force Littman arrangement showing an example of a Littrow arrangement are also possible.
- Example 3 a method for manufacturing the optical semiconductor device 1 of Example 1 shown in FIGS.
- FIG. 8A to FIG. 10D are manufacturing process diagrams showing a method of manufacturing an optical semiconductor device according to the present invention and a partial modification thereof, respectively.
- the upper surface 2a of the n-type InP substrate 2 which is formed in a rectangular shape with the (100) crystal plane as the upper surface and doped with n-type impurities, has Using the (MOVPE) method, the n-type layer with a layer thickness of 0.5 m and an n-type impurity concentration of 1. OX 10 18 cm- 3 One cladding layer 6 is formed.
- an active layer 7 having a layer thickness of 0.2 ⁇ m and having a multiple quantum well structure made of non-doped InGaAs is formed.
- a p-type second cladding layer 8 having a layer thickness of 0.45 ⁇ m and a ⁇ -type impurity concentration of 5 to 7 ⁇ 10 17 cm— 3 is formed. You.
- a ⁇ -type InGaAsP having a layer thickness of 0.15 ⁇ m and a ⁇ -type impurity concentration of 5 to 7 ⁇ 10 17 cm ⁇ 3 is provided.
- a ⁇ -type cap layer 32 is formed.
- a mask layer 33 made of SiNx having a thickness of 80 nm is formed on the upper side of the cap layer 32 by using plasma CVD or the like.
- the mask layer 33 formed on the upper side of the cap layer 32 is striped by photolithography in the ⁇ 011> direction, which is the long direction of the n-type InP substrate 2. By this, a mask 33a to be used for the next etching is formed.
- the width S of the mask 33a used for this etching is the trapezoidal mesa to be formed.
- the width is set slightly wider than the width of the stripe portion 3.
- the length S in the longitudinal direction of the mask 33a used for etching is an n-type InP substrate.
- a margin of length L is provided above the cap layer 32 to form the window regions 4a and 4b on both sides of the mask 33a.
- etching was performed from above to obtain a perspective view of Fig. 9A, a front view of Fig. 9B, and a top view of Fig. 9C.
- the etching rate of the cap layer 32 is higher than that of the other portions, the etching rate of the lower portion of the cap layer 32 is also higher.
- the side surface 3c of the mesa stripe portion 3 can be set to a desired inclination angle ⁇ .
- the corner (corner) at the end 33b of the mask 33a is formed on the side surface. Since both ends are etched, the amount of etching increases.
- the portion near 32 has the largest amount of etching.
- the portion near the upper surface 2a of the n-type InP substrate 2 has a flat pyramid shape with the smallest amount of etching.
- the end face 3a of the mesa stripe portion 3 is not perpendicular to the upper surface 2a of the n-type InP substrate 2, but is inclined at a predetermined angle) 8 in the longitudinal direction (see FIG. 9B). ).
- end surface 3a of mesa stripe portion 3 is inclined at a predetermined angle with respect to the ⁇ 100> direction, and at a predetermined angle ⁇ ⁇ ⁇ ⁇ with respect to the ⁇ 011> direction. .
- the cap layer 32 and the etching conditions are arbitrarily set within a predetermined range, thereby being arbitrarily set within a predetermined range. Is possible.
- a current block portion 5 is generated in a portion (window regions 4a, 4b) surrounded by the end surfaces 3a, 3b at both ends and the upper surface 2a of the n-type InP substrate 2, that is, a portion etched first.
- FIG. 10A shows a cross-sectional shape at a position where mesa stripe portion 3 is formed.
- the basic configuration of the method for manufacturing a semiconductor device according to the present invention as described above includes a step of preparing a semiconductor substrate 2 made of InP, as shown in FIGS. Forming an active layer 7 above the semiconductor substrate 2 in parallel with the upper surface 2a of the semiconductor substrate; A step of forming an n-type first cladding layer 6 of InGaAsP force below the active layer 7 and a step of forming a p-type second cladding layer 8 of InP above the active layer 7 And forming window regions 4a and 4b on at least one of the light emitting end faces of both the light emitting end faces of the active layer 7, wherein the electric field intensity distribution of light generated in the active layer 7 is reduced.
- the refractive index of the n-type first cladding layer 6 was set to na and the refractive index of the p-type second cladding layer 8 was set to nb so as to be biased toward the n-type first cladding layer 6.
- the refractive index na of the n-type first cladding layer 6 is set to be higher than the refractive index nb of the p-type second cladding layer 8 such that na> nb! /
- the p-type current blocking layer 9 having a layer thickness of 0.7 ⁇ m, ⁇ as an impurity, and an impurity concentration of 1 ⁇ 10 18 cm ⁇ 3 is formed by the aforementioned metalorganic vapor phase. It is formed using the growth (MOVPE) method.
- an n-type current block having a layer thickness of 1.15 m, Si as an impurity, and an impurity concentration of 2 ⁇ 10 18 cm— 3 is provided.
- Layer 10 is formed using the metal organic chemical vapor deposition (MOVPE) method described above.
- the p-type current block layer 9 and the n-type current block 10 constitute a current block 5.
- the second p-type cladding layer 8 is removed.
- the upper surface of layer 8 is exposed.
- a ⁇ -type contact layer 12 made of InGaAsP and having a layer thickness of 0.3 ⁇ m is formed above the third cladding layer 11.
- a first electrode (p electrode) 13 is attached on the upper surface of the p-type contact layer 12, and further, the lower side of the n-type InP substrate 2 is also provided.
- the second electrode (n electrode) 14 is attached. [0186] Finally, after the optical semiconductor element 1 is cut out by cleavage, antireflection films 15a and 15b are formed on the end faces la and lb of the optical semiconductor element 1.
- the end faces 3a and 3b of the mesa stripe portion 3 are located inside the longitudinal end faces la and lb by the window areas 4a and 4b, and the end faces 3a and 3b extend in the longitudinal direction.
- the optical semiconductor element 1 which is inclined with respect to the center and has the cross-sectional shape shown in FIG. 3 in the central portion in the long direction and the cross-sectional shape shown in FIG. 4 in both end portions in the long direction is manufactured.
- the upper surface of the cap layer 32 is provided with an end region in the longitudinal direction of the upper surface having the rectangular shape.
- a rectangular mask 33a is formed in a region excluding the above, and then, the n-type first cladding layer 6, the active layer 7, the p-type second cladding layer 8, and the cap layer 32 are etched. It has a length L along the longitudinal direction on the n-type InP substrate 2 and the end faces 3a and 3b are in the longitudinal direction (laser
- a mesa stripe portion 3 inclined with respect to the light emission direction) is formed.
- the mesa stripe portion 3 in which the long end faces 3a and 3b are located inside the optical semiconductor device 1 is formed once.
- the manufacturing process can be greatly simplified as compared with the conventional method for manufacturing an optical semiconductor device having a window structure.
- FIG. 7A to 7E When manufacturing the optical semiconductor device 1 of Example 2 shown in FIGS. 7A to 7E, FIG.
- a rectangular mask 33a 'having a length 2S twice as long as the length S of the mask 33a in 8C is used.
- the optical semiconductor device 1 having a length 2L twice as long as the length L of the optical semiconductor device 1 to be manufactured using
- the optical semiconductor element 1A having a length 2L twice as long as that of the optical semiconductor element 1 to be manufactured is divided into two using a cleavage method.
- the semiconductor substrate 2, the n-type first cladding layer 6, the active layer 7, and the P-type second cladding layer 8 are each manufactured in the longitudinal direction.
- the optical semiconductor element 1 is formed to have a length 2L twice as long as that of the optical semiconductor element 1.
- the window regions 4a and 4b are formed on both end surfaces of the active layer 7 different from the first main surface and the second main surface, respectively.
- the semiconductor substrate 2 has a length 2La corresponding to twice the length 2L of the optical semiconductor element 1 to be manufactured along the longitudinal direction on the semiconductor substrate 2, and the both end faces are in the longitudinal direction.
- a mesa strip portion 3 which is inclined at a predetermined inclination angle ⁇ ⁇ ⁇ ⁇ with respect to a direction orthogonal to the elongate direction while being inclined at a predetermined inclination angle j8, the optical semiconductor element 1
- An optical semiconductor device 1A having a double length 2L is formed.
- the mesa stripe portion 3 of the optical semiconductor device 1A having a length twice as long as the optical semiconductor device 1 to be manufactured is cleaved by a D-D cutting line at a central portion in the longitudinal direction using a cleavage method.
- the optical semiconductor elements 1, 1 to be manufactured are cut out by dividing into two.
- FIG. 11 is a cross-sectional view showing another configuration of the mesa stripe portion of the optical semiconductor device according to the present invention.
- the mesa stripe portion 3 includes the n-type first cladding layer 6, the active layer 7, and the p-type second cladding layer. It consists of eight.
- the n-type first cladding layer 6 and the first SCH (Separate Confinement Heterostructure: optical confinement structure)
- the layer 16, the active layer 7, the second SCH layer 17, and the p-type second cladding layer 8 are laminated in this order to form the mesa stripe portion 3.
- each of the SCH layers 16, 17 has a multilayer structure having a plurality of layers, and is formed of InGaAsP.
- the active layer 7 is, for example, a four-layer MQW (Multi Quantum Well) in which four well layers and five barrier layers located on both sides of the well layer are stacked. The structure is adopted.
- the n-type first cladding layer 6 is higher in refractive index than the p-side second cladding layer 8 and lower than the refractive index of each of the SCH layers 16 and 17 It is composed of InGaAsP.
- the refractive index of the plurality of layers constituting each of the SCH layers 16 and 17 is gradually reduced from the active layer 7 toward the cladding layers 6 and 8, ie, the active layer (7) It is set so that it gets smaller as you move away from it.
- an InGaAsP well layer, an InGaAsP barrier layer, and a force S are alternately grown to form an active layer 7 having a multiple quantum well structure with four wells. .
- the p-side second cladding layer 8 is further formed on the second SCH layer 17.
- an optical semiconductor device 1 according to Embodiment 4 in which the optical semiconductor device 1 having the above configuration is applied as an SLD (Super Luminescent Diode) will be described with reference to FIGS. 12A to 12C.
- FIGS. 12A to 12C are top views each showing a modified example of the optical semiconductor device according to the present invention.
- the SLD is used as a light source, so that only one side needs to be coupled to an optical fiber into which output light having an SLD power is incident.
- the region length of the window region on the side that is not coupled with the optical fiber is the window on the side coupled with the optical fiber.
- the length of the region is made longer than the region length.
- Fig. 1 As a structure for further suppressing the end face reflectivity as compared with the structure of Fig. 12A, for example, Fig. 1
- the optical semiconductor device 1 shown in Figs. 12A to 12C has the basic structure of the layer structure described in the first and fourth embodiments. In the following description, the first and second embodiments will be described. The same components as those in the fourth embodiment are denoted by the same reference numerals, and description thereof is omitted.
- the longitudinal direction of the mesa stripe portion 3 is formed at right angles to the surface of the antireflection film 15a which is the output end face.
- the angle at which the output light is not perpendicular to the surface of the antireflection film 15a (corresponding to the optical axis CC of FIG. 12A), which is the output end face, is set.
- the mesa stripe portion 3 is formed so as to hold.
- the region length of the window region to be coupled to the optical fiber is shorter in the mesa stripe portion 3 on the side.
- the output light is gradually inclined toward the end face 3a, and the output light is inclined at a predetermined angle near the end face 3a so that the output light is not perpendicular to the surface of the antireflection film 15a.
- the output light is not perpendicular to the surface of the anti-reflection film 15a, but the entire mesa stripe portion 3 is inclined at a predetermined angle so as to have an angle.
- the optical semiconductor device 1 of Figs. 12B and 12C has a configuration having window regions on both sides.
- a part or the whole of the mesa stripe portion 3 is inclined so that the output light has a non-perpendicular angle with respect to the surface of the antireflection film 15a which is the output end face.
- the output light has a non-perpendicular angle with respect to the output end face (the surface of the antireflection film 15a).
- Example 5 in the optical semiconductor device 1 shown in Figs. 12B and 12C, the end face reflectivity decreases as the inclination angle of the output light with respect to the surface of the non-reflective film 15a as the output end face increases. Can be.
- the n-type first cladding layer 6 is made of InGaAsP having a high refractive index, the light confinement coefficient of the light in the active layer 7 is lower than that of the conventional optical semiconductor device.
- the end face reflectivity is an index relative to the size of the beam spot size emitted from the active layer. It is known to decrease functionally.
- the optical semiconductor element 1 having a window region on one side or both sides, in a structure in which the beam spot size emitted from the active layer 7 is substantially increased, The effect of inclining the active layer stripe with respect to the end face is extremely large.
- the end face reflectance becomes about 1Z10 when the inclination angle is 6 °. It drops to about 1Z100 when the inclination angle is 8 °.
- the description has been made based on the optical semiconductor device having a buried structure, but it is needless to say that the present invention can be applied to an optical semiconductor device having a ridge structure. No.
- the mesa stripe portion 3 includes the n-type cladding layer (the n-type first cladding layer 6), the active layer 7, and the p-type cladding layer (p In the case of the second cladding layer 8), the n-type cladding layer 6 is formed of a quaternary material (In, Ga, As, P) having a higher refractive index than the p-type cladding layer 8. ing.
- the mesa stripe portion 3 includes an n-type cladding layer (n-type first cladding layer 6), a first SCH layer 16, an active layer 7, a second SCH layer 17, and a p-type cladding layer.
- the refractive index of the InGaAsP layer is higher than the refractive index of the p-type cladding layer 8 and lower than the refractive index of each layer constituting each SCH layer.
- an n-type cladding layer 6 is formed.
- the electric field intensity distribution of light generated in the active layer 7 is converted to a p-In
- the force on the side of the p-type second cladding layer 8 made of P can also be shifted to the side of the n-type first cladding layer 6.
- the electric field intensity distribution of light generated in the active layer 7 is shifted to the n-type first cladding layer 6 side, so that the active layer 7 Since the generated light does not cause unwanted scattering or diffraction in the window region, it is possible to suppress the generation of undesired reflected light in the manner described above.
- the layer thickness can be reduced.
- the time required for forming the cladding layer by the vapor phase growth method can be reduced as compared with the conventional case, so that the overall manufacturing time of the optical semiconductor device 1 can be reduced.
- the manufacturing cost can be reduced.
- the active layer in order to realize an optical semiconductor device capable of easily suppressing the influence of interference in a window region where the active layer is interrupted near the end face, the active layer is generated in the active layer.
- the light generated in the active layer does not cause undesired scattering or diffraction in the window region.
- the thickness of the p-side cladding layer is not increased as in the conventional case, and the reflected light from the electrode does not require a long manufacturing time or increases the manufacturing cost. It is possible to provide an optical semiconductor device capable of effectively suppressing the influence of interference due to light and a method for manufacturing the same.
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Abstract
Description
Claims
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JP2005517402A JPWO2005074047A1 (ja) | 2004-01-28 | 2005-01-13 | 光半導体素子およびその製造方法 |
US10/547,404 US20060166386A1 (en) | 2004-01-28 | 2005-01-13 | Optical semiconductor device and its manufacturing method |
EP05703527A EP1601028A4 (en) | 2004-01-28 | 2005-01-13 | OPTICAL SEMICONDUCTOR COMPONENT AND METHOD FOR THE PRODUCTION THEREOF |
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EP (1) | EP1601028A4 (ja) |
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JP5519355B2 (ja) * | 2010-03-19 | 2014-06-11 | スタンレー電気株式会社 | 半導体発光素子及びその製造方法 |
JP5660940B2 (ja) * | 2010-04-27 | 2015-01-28 | 住友電工デバイス・イノベーション株式会社 | 光半導体装置の製造方法 |
DE102013211851B4 (de) * | 2013-06-21 | 2018-12-27 | Osram Opto Semiconductors Gmbh | Kantenemittierender Halbleiterlaser und Verfahren zu seiner Herstellung |
JP2018098263A (ja) * | 2016-12-08 | 2018-06-21 | 住友電気工業株式会社 | 量子カスケード半導体レーザ |
WO2018134950A1 (ja) * | 2017-01-19 | 2018-07-26 | 三菱電機株式会社 | 半導体レーザ素子、半導体レーザ素子の製造方法 |
US11949043B2 (en) * | 2020-10-29 | 2024-04-02 | PlayNitride Display Co., Ltd. | Micro light-emitting diode |
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JPH05315641A (ja) * | 1992-05-11 | 1993-11-26 | Matsushita Electron Corp | 半導体発光素子およびその製造方法 |
JPH06237011A (ja) * | 1993-02-12 | 1994-08-23 | Olympus Optical Co Ltd | 光半導体素子 |
JP2000174394A (ja) * | 1998-12-02 | 2000-06-23 | Nec Corp | 半導体レーザ |
JP2003017809A (ja) * | 2001-07-02 | 2003-01-17 | Anritsu Corp | 半導体発光素子及びその製造方法 |
JP2003298189A (ja) * | 2002-03-28 | 2003-10-17 | Anritsu Corp | 半導体レーザ |
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US4882734A (en) * | 1988-03-09 | 1989-11-21 | Xerox Corporation | Quantum well heterostructure lasers with low current density threshold and higher TO values |
US4872180A (en) * | 1989-06-16 | 1989-10-03 | Gte Laboratories Incorporated | Method for reducing facet reflectivities of semiconductor light sources and device thereof |
JP3481458B2 (ja) * | 1998-05-14 | 2003-12-22 | アンリツ株式会社 | 半導体レーザ |
US6650671B1 (en) * | 2000-01-20 | 2003-11-18 | Trumpf Photonics, Inc. | Semiconductor diode lasers with improved beam divergence |
WO2001091259A1 (en) * | 2000-05-24 | 2001-11-29 | Italtel S.P.A. | External cavity laser |
JP2003078208A (ja) * | 2001-08-31 | 2003-03-14 | Toshiba Corp | 半導体レーザ装置及びその製造方法 |
-
2005
- 2005-01-13 JP JP2005517402A patent/JPWO2005074047A1/ja active Pending
- 2005-01-13 EP EP05703527A patent/EP1601028A4/en not_active Withdrawn
- 2005-01-13 US US10/547,404 patent/US20060166386A1/en not_active Abandoned
- 2005-01-13 WO PCT/JP2005/000288 patent/WO2005074047A1/ja not_active Application Discontinuation
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JPH05315641A (ja) * | 1992-05-11 | 1993-11-26 | Matsushita Electron Corp | 半導体発光素子およびその製造方法 |
JPH06237011A (ja) * | 1993-02-12 | 1994-08-23 | Olympus Optical Co Ltd | 光半導体素子 |
JP2000174394A (ja) * | 1998-12-02 | 2000-06-23 | Nec Corp | 半導体レーザ |
JP2003017809A (ja) * | 2001-07-02 | 2003-01-17 | Anritsu Corp | 半導体発光素子及びその製造方法 |
JP2003298189A (ja) * | 2002-03-28 | 2003-10-17 | Anritsu Corp | 半導体レーザ |
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EP1601028A4 (en) | 2012-09-12 |
US20060166386A1 (en) | 2006-07-27 |
JPWO2005074047A1 (ja) | 2008-01-10 |
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