WO2001022545A1 - Element lumineux et module d'element lumineux - Google Patents
Element lumineux et module d'element lumineux Download PDFInfo
- Publication number
- WO2001022545A1 WO2001022545A1 PCT/JP2000/003947 JP0003947W WO0122545A1 WO 2001022545 A1 WO2001022545 A1 WO 2001022545A1 JP 0003947 W JP0003947 W JP 0003947W WO 0122545 A1 WO0122545 A1 WO 0122545A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- layer
- light emitting
- emitting device
- substrate
- conductivity type
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/0004—Devices characterised by their operation
- H01L33/0045—Devices characterised by their operation the devices being superluminescent diodes
-
- 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
- H01S5/223—Buried stripe structure
- H01S5/2231—Buried stripe structure with inner confining structure only between the active layer and the upper electrode
-
- 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
- H01S2301/00—Functional characteristics
- H01S2301/17—Semiconductor lasers comprising special layers
- H01S2301/173—The laser chip comprising special buffer layers, e.g. dislocation prevention or reduction
-
- 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
-
- 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
- H01S5/2004—Confining in the direction perpendicular to the layer structure
- H01S5/2018—Optical confinement, e.g. absorbing-, reflecting- or waveguide-layers
-
- 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
- H01S5/2004—Confining in the direction perpendicular to the layer structure
- H01S5/2018—Optical confinement, e.g. absorbing-, reflecting- or waveguide-layers
- H01S5/2027—Reflecting region or layer, parallel to the active layer, e.g. to modify propagation of the mode in the laser or to influence transverse modes
-
- 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
- H01S5/3202—Structure or shape of the active region; Materials used for the active region comprising PN junctions, e.g. hetero- or double- heterostructures grown on specifically orientated substrates, or using orientation dependent 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
- 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
- H01S5/3211—Structure or shape of the active region; Materials used for the active region comprising PN junctions, e.g. hetero- or double- heterostructures characterised by special cladding layers, e.g. details on band-discontinuities
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/548—Amorphous silicon PV cells
Definitions
- the present invention relates to a light emitting device and a light emitting device module including the light emitting device.
- INDUSTRIAL APPLICABILITY The present invention can be suitably used for a semiconductor laser such as an excitation light source for an optical fiber amplifier. It can also be applied to light emitting devices such as LEDs and super luminescent diodes. Background art
- optical information processing technology and optical communication technology has been remarkable.
- a large-capacity optical fiber transmission line and the flexibility of the transmission method must be used.
- An amplifier for signal amplification is indispensable.
- EDFAs optical fiber amplifiers
- research on optical fiber amplifiers (EDFAs) doped with rare earth elements such as Er 3+ has been actively conducted in various fields. Development of an excellent semiconductor laser for an excitation light source, which is an indispensable component of the EDFA, is awaited.
- excitation light source oscillation wavelengths there are three types that can be used for EDF A applications: 80 On m, 980 nm, and 1480 nm. It is known from the amplifier characteristics that pumping at 98 Onm is the most desirable, considering gain and noise characteristics.
- Such a laser having an oscillation wavelength in the 980 nm band is realized mainly by using InGaAs as an active layer on a GaAs substrate, and contradicting demands for high output and long life. It is required to meet.
- SHG light sources at wavelengths in the vicinity, for example, 890 to 1150 nm, and development of lasers with excellent characteristics in various other applications is awaited.
- the wavelength of semiconductor lasers has been shortened for high-density recording. It is.
- the recent development of blue lasers has been remarkable, and the reliability of GaN-based materials grown on substrates such as AlO x has been increasing, and further research is ongoing.
- the characteristics required for a laser in the 980 nm band on a GaAs substrate include, in addition to the high output characteristics and high reliability described above, stability of optical output, linearity of current optical output,
- the stability of the oscillation wavelength is also important.
- the importance of the stability of the optical output is because if the degree of excitation of the Er 3 + doped in the quartz fiber fluctuates, this will fluctuate the gain of the optical amplifier itself.
- Excellent linearity of the current light output characteristics is necessary to control the laser to maintain a constant output even when the external environment such as temperature changes. Since the absorption band of Er 3 + doped in the quartz fiber is narrow, the stability of the oscillation wavelength is also important.
- the mode jump is shown to be 0.2 to 0.3 nm.
- the gain differs between different oscillation wavelengths, which causes intensity noise. This is due to the fact that the higher-order mode is cut off by the waveguide design, which is independent of the stabilization of the transverse mode. As a result, the fluctuation in the current-optical output characteristics of the laser ( (Non-linearity).
- the substrate is transparent to the wavelength at which it is emitting (for example, if the GaAs substrate is transparent to the light emitted from the InGaAs active layer).
- the GaAs substrate is transparent to the light emitted from the InGaAs active layer.
- large intensity noise with a wider wavelength interval is generated compared to the lasers reported in the past. This is due to the following reasons (Journal of quantum electronics, vol.33 No.10, ppl801-1809 0ctrber 5 1997) o
- the substrate generally has a thickness of about 100 to 150 ⁇ m, but as a result, intensity modulation can be seen in the structure of the oscillation spectrum at a wavelength interval of about 2 to 3 nm. . In other words, there are longitudinal modes that are relatively easy to oscillate at intervals of 2 to 3 nm, and these will cause mode competition.
- the gain of the laser differs as the wavelength increases, and mode competition is unlikely to occur between modes as far apart as about 1 Onm.
- the gain difference is relatively large between the modes separated by 2 to 3 nm as described above, they are not so far apart that mode competition does not occur, which is extremely large compared to the mode hop between adjacent Fabry-Perot modes.
- Large intensity noise is generated.
- the competition between the oscillation wavelengths related to the waveguide mode originating from the substrate and the intensity modulation between the oscillation spectrums indicate that the substrate emits light.
- Mode hopping between normal Fabry-Bello modes which occurs when absorbing wavelengths, also causes large intensity noise.
- the present invention provides a method for competing for oscillation wavelengths related to waveguide modes originating from the substrate, which is observed when the substrate is transparent to the emission wavelength, and for the inter-oscillation spectrum.
- the purpose of this study was to suppress the intensity modulation of the light-emitting device, achieve a light-emitting device with excellent light output linearity, and improve the coupling characteristics with the external resonator.
- Another object of the present invention is to provide a light-emitting element module using the light-emitting element and operating stably in a wide temperature range and a wide output range. Disclosure of the invention
- the present inventors have conducted intensive studies and as a result, have found that a substrate having a higher refractive index than the cladding layer of the light emitting element and transparent to the emission wavelength, and an active layer structure formed on the substrate, A light emitting element, wherein a layer for suppressing the modulation of oscillation intensity due to the waveguide mode derived from the substrate is formed between the substrate and the active layer structure, and / or the thickness of the substrate is According to the light emitting device of the present invention, which is not more than 75 zm, it has been found that the object of the present invention can be achieved.
- a first conductivity type clad layer having the same conductivity type as that of the substrate is formed between the substrate and the active layer structure.
- a low refractive index layer of the first conductivity type is formed between the mold cladding layers, and a real part of the refractive index n sub with respect to the emission wavelength of the substrate and the average refractive index with respect to the emission wavelength of the first conductivity type cladding layer.
- the light-emitting element include n c i ad and an average refractive index n LI that satisfies (Equation 1) with respect to the emission wavelength of the first conductive type low refractive index layer.
- the thickness T LIL 1 and the emission wavelength of the first conductivity type low refractive index layer satisfy Expression (2), and the thickness of the first conductivity type cladding layer is 2.0 to 3.0. preferable. (Expression: L) n sub > n c ! Ad !> N LIL1
- the first aspect further includes: a second conductivity type clad layer formed on the active layer structure; a second conductivity type low refractive index layer formed on the second conductivity type clad layer; A contact layer formed on the two-conductivity-type low-refractive-index layer; and a refractive index n clad2 with respect to the emission wavelength of the second-conductivity-type clad / sword layer; refractive Oriritsu n c for the emission wavelength of the refractive index n LIL2, and the contact layer against.
- nt satisfies (Equation 3).
- the thickness T LIL2 and the emission wavelength of the second conductivity type low refractive index layer satisfy Expression (4), and the thickness of the second conductivity type cladding layer is 2.0 to 3.5 ⁇ m. It is preferred that
- a light emitting device in which the thickness of the substrate is 7 or less can be given.
- the thickness of the substrate is preferably not more than 50 m.
- the present invention also provides a light emitting device module including the above light emitting device.
- the light emitting element module according to the present invention, it is preferable that the light emitting element has an external resonator in a light emission direction and oscillates only at a single wavelength.
- the external resonator is a grating fiber that selectively reflects a specific wavelength in a light emission direction of the light emitting element, and a reflectance of light to a laser side is 2 to 15% at an oscillation wavelength of the laser.
- the reflection band is preferably 0.1 to 5. Onm with respect to the center wavelength.
- FIG. 1 is a cross-sectional view of a semiconductor laser which is one embodiment of the light emitting device of the present invention.
- FIG. 2 is a perspective view of a semiconductor laser which is one mode of the light emitting device of the present invention.
- FIG. 3 is a diagram showing the relationship between the wavelength of light incident on the reflection region and the reflectance.
- Figure 4 is a graph showing the relation between the number and the reflectivity of the pair of A 1 0. 7 7 G a 0. 2 3 A s and G a A s which constitute the reflective region.
- FIG. 5 is a graph showing a current light output characteristic of the semiconductor laser of the first embodiment.
- FIG. 6 is a graph showing the relationship between the current and the slope efficiency of the semiconductor laser of Example 1.
- FIG. 7 is a graph showing the change in the peak wavelength p of the semiconductor laser of Example 1.
- FIG. 8 is a graph showing a change in the center wavelength c of the semiconductor laser of the first embodiment.
- FIG. 9 is a graph showing current light output characteristics of a semiconductor laser of a comparative example.
- FIG. 10 is a graph showing the relationship between the current and the slope efficiency of the semiconductor laser of the comparative example.
- FIG. 11 is a graph showing a change in the peak wavelength p of the semiconductor laser of the comparative example.
- FIG. 12 is a graph showing a change in the center wavelength c of the semiconductor laser of the comparative example. Detailed description of the invention
- the light-emitting device of the present invention is a light-emitting device having a higher refractive index than the cladding layer of the light-emitting device, and having at least a substrate transparent to an emission wavelength and an active layer structure formed on the substrate. is there.
- the feature is that a layer for suppressing the modulation of the oscillation intensity due to the waveguide mode derived from the substrate is formed between the substrate and the active layer structure, and / or the thickness of the substrate is 75 / m or less. It is to be.
- the formation of the layer for suppressing the modulation of the oscillation intensity and the control of the thickness of the substrate may be performed by selecting one of them, or may be performed by combining both. Particularly preferred are a case where the layer for suppressing the modulation of the oscillation intensity is formed alone and a case where both are combined.
- FIGS. 1 and 2 schematically show the light emitting device of the present invention. This will be described with reference to the grooved semiconductor laser described above.
- this semiconductor laser has a buffer layer (2), a first conductivity type low refractive index layer (3), a first conductivity type cladding layer (4), an active layer structure on a substrate (1).
- a second conductive type first cladding layer (6) is formed in order, and a current blocking layer (6) having a stripe-shaped groove in the center is formed on the second conductive type first cladding layer (6).
- 8) and a cap layer (9) are formed.
- a second conductive type second cladding layer (7) is formed in the stripe-shaped groove and on the cap layer (9), and further thereon, a second conductive type low refractive index layer (10) and a contact are formed.
- the layers (11) are formed in order. Electrodes (12, 13) are formed above the contact layer (11) and below the substrate (1). Furthermore, a coating layer (15, 16) is formed on the end face as shown in FIG.
- the expression “B layer formed on the A layer” refers to the case where the B layer is formed so that the bottom surface of the B layer is in contact with the upper surface of the A layer, and the case where the B layer is formed on the upper surface of the A layer. This includes both the case where one or more layers are formed and the layer B is formed on the layer.
- the above expression also includes a case where the upper surface of the layer A and the bottom surface of the layer B are partially in contact with each other, and in other portions, one or more layers exist between the layer A and the layer B. Specific aspects are apparent from the following description of each layer and specific examples of Examples.
- the substrate (1) must have a higher refractive index than the later-described first conductivity type cladding layer (4) and be transparent to the emission wavelength.
- the substrate is a single GaAs substrate.
- a crystal substrate is used.
- GaAs is desirable from the viewpoint of lattice matching with IIIV semiconductor lasers containing As, P, etc. as V group.
- the description of the element ⁇ group> in the form of a numeral is in accordance with the conventional expression method.
- Off-substrate has the effect of promoting crystal growth in step flow mode. Has been widely used. Off-substrates having a slope of about 0.5 to 2 degrees are widely used, but the slope may be about 10 degrees depending on the material system that constitutes the quantum well structure.
- the substrate may be previously subjected to chemical etching, heat treatment, etc. in order to manufacture semiconductor lasers using crystal growth techniques such as MBE or MOCVD.
- the thickness of the substrate is not particularly limited when a layer for suppressing the modulation of oscillation intensity due to the waveguide mode derived from the substrate is formed between the substrate and the active layer structure. Considering the mechanical strength, the thickness is generally about 100 to 150 / m. However, when it is necessary to further improve the light output linearity, for example, the thickness is preferably set to 75 ⁇ m or less, and more preferably 50 ⁇ m or less. For example, in a substrate with a thickness of about 50 / m, the interval between the oscillation wavelengths that are intensity-modulated by the waveguide mode derived from the substrate is extremely widened to 7 to 9 nm, and the gain of one of the two modes is considerably small. As a result, it is effective in suppressing the intensity modulation between the oscillation spectrums.
- the thickness of the substrate is reduced to 75 ⁇ m or less, and preferably to 50 ⁇ m or less.
- the method for preparing a light-emitting element using such a relatively thin substrate is not particularly limited.
- a light emitting element may be manufactured by preparing a substrate of 75 m or less in advance and forming another layer on it, or forming another layer on a substrate having a thickness exceeding 5 m. After that, the thickness of the substrate may be reduced to 75 m or less to manufacture the light emitting device. It is preferable to select the latter method because a substrate having a thickness of 75 ⁇ m or less has low mechanical strength.
- the buffer layer (2) is preferably provided to alleviate incompleteness of the substrate bulk crystal and facilitate the formation of an epitaxial thin film having the same crystallographic axis.
- the buffer layer (2) is preferably composed of the same compound as the substrate (1). Since the substrate is Ga As, GaAs is usually used. However, the superlattice layer becomes the buffer layer It is also widely used and need not be formed of the same compound. On the other hand, when a dielectric substrate is used, a material different from the substrate may be appropriately selected depending on the desired emission wavelength and the structure of the entire device, instead of the same substance as the substrate.
- One of the features of the light emitting device of the present invention is that a layer for suppressing the modulation of the oscillation intensity due to the waveguide mode derived from the substrate is formed between the substrate and the active layer structure.
- the layer that suppresses the oscillation intensity modulation has the function of suppressing the leakage of light from the active layer structure to the substrate side and the modulation of the oscillation intensity due to the waveguide mode derived from the substrate. If so, the constituent material, shape, thickness, etc. are not particularly limited.
- the first-conductivity-type low-refractive-index layer (3) shown in the embodiment of FIG. 1 can be cited as a preferred example of a layer that suppresses oscillation intensity modulation.
- the average refractive index n LIL1 with respect to the emission wavelength of the first conductivity type low refractive index layer (3) is determined by the refractive index with respect to the emission wavelength of the substrate.
- rate n sub the difference between the first with real number portion n Cladl of average refractive index for the emission wavelength of the conductive clad layer be appropriately selected so as to satisfy the above formula 1 is preferably c n sub and n Cladl below ( n sub — n cladl ) is preferably greater than 0.1, more preferably greater than 0.15 .
- n Ciadl and n LIL1 are preferably greater than 0.1, more preferably greater than 0 ⁇ 12.
- the refractive index in the present specification is a value calculated by the method described in Journal of Applied Physics, Vol. 58 (3), 1985, R1-R29.
- a substrate having a higher refractive index than the first-conductivity-type clad layer causes the first-conductivity-type clad layer to move away from the first-conductivity-type clad layer. Exudation of the light of the first conductivity type is promoted, and a longitudinal mode derived from the substrate is induced.However, by including a layer that satisfies Equation 1 in the element, the substrate is effectively viewed from the first conductivity type cladding layer side. The refractive index on the substrate side can be reduced, and seepage of light to the substrate side can be eliminated.
- the material and structure of the first conductivity type low refractive index layer are particularly there are no restrictions and various options are available.
- the thickness of the first-conductivity-type low-refractive-index layer is particularly limited as long as it effectively lowers the refractive index of the substrate side as viewed from the first-conductivity-type clad layer side and eliminates light seepage to the substrate side.
- TLI is preferably larger than person / 10, and more preferably larger than person / 7.
- a reflection region having a function of reflecting light from the active layer structure toward the active layer structure can also be formed as a layer that suppresses modulation of oscillation intensity due to a waveguide mode derived from the substrate.
- the light emitted from the active layer fluctuates depending on conditions such as temperature and output.
- the reflection region referred to here is a reflection region that reflects light having an oscillation wavelength in a normal practical environment (such as operating temperature) of the light emitting device of the present invention.
- the operating temperature of a 98 Onm band EDFA excitation light source used in a submarine cable repeater is about 5 to 40 ° C. When used in terrestrial networks, it has a temperature control function, and its main operating temperature is 25 ° C.
- the term "reflection" as used herein means that light reflects at least 0.05% or more, preferably 1% or more, more preferably 5% or more, still more preferably 20% or more, and particularly preferably 30% or more. It means to do.
- Such a reflection region reflects the light toward the active layer structure side, so that the oscillation wavelength It reduces the penetration of light into a substrate or the like, where waveguiding at that portion unnecessarily adversely affects the original oscillation spectrum such as intensity modulation.
- the structure and material of the reflection region are not particularly limited as long as it has such a function.
- the reflection region is usually formed in a layer shape (hereinafter, the reflection region formed in a layer shape is referred to as a “reflection mirror layer”).
- the reflection mirror layer is desirably located between the substrate and a first conductivity type clad layer described later. Further, the reflection mirror layer can also serve as the cladding layer.
- the reflection mirror layer is divided into a first reflection mirror layer and a second reflection mirror layer, and the first reflection mirror layer is provided between the substrate (1) and the first conductivity type cladding layer (4), for example.
- One layer can be located between a second-conductivity-type second cladding layer (7) described later and a contact layer (11) described later.
- the first reflection mirror layer suppresses light from the active layer structure side from entering the substrate (1), and the second reflection mirror layer (10) transmits light from the active layer structure side to the contact layer.
- (11) Performs the function of restraining entry into (1).
- first reflective mirror layer also serves as the first conductive type cladding layer
- second reflective mirror layer also serves as the second conductive type first cladding layer and / or the second conductive type second cladding layer described later. is there.
- the band of the light reflected by the reflection mirror layer can be appropriately designed according to the intended use of the light emitting device. For example, 0 & eight trioctahedral 1 0 on the substrate. The 77 Ga 0. 23 As with the order of this the GaAs, when stacked ten pairs 78. 6 nm / 68. 9 nm is opposite to the GaAs board The wavelength dependence of the reflectivity for incident light from the air is shown in Fig. 2.
- the A 1 0 reflectance for light incident from air at 98 onm. 77 Ga Q. Becomes cages when indicated by the .smallcircle in Figure 3 shows as a function of the number of 23 As and GaAs pair. In addition, when the light enters from inside GaAs, it becomes as shown by the + mark in FIG. By appropriately obtaining these data, a semiconductor laser having a desired function can be manufactured.
- the reflection mirror layer is designed to reflect not only the light of the oscillation wavelength but also the band near the oscillation wavelength. In this case, it is desirable to design the band so that the emission wavelength of the light emitting element does not always deviate from the reflection band at the operating temperature and output range of the device, and the reflectance is high at the oscillation wavelength of the light emitting element. It is desirable to design.
- a first conductivity type low refractive index layer of a semiconductor laser described in Examples to be described later is formed in a first reflection region [for example, n having a carrier concentration of IX 10 18 cm ⁇ 3 . Mold Al. . 77 Ga. . 23 As (78.6 nm thickness) / GaAs (68.9 nm thickness) pairs replaced with 8 pairs], the low refractive index layer of the first conductivity type is replaced with the second reflection region [for example, carrier concentration 1 X 1 0 18 cm— 3 n-type I n Q. 5 Ga 0 . 5 P (thickness 74.
- the first-conductivity-type cladding layer (4) is generally made of a material having a refractive index smaller than the average refractive index of the active layer structure (5), and is provided on a substrate (1) prepared to realize a desired oscillation wavelength. ),
- the notch layer (2), the first conductivity type low refractive index layer (3), the active layer structure (5), and the like, the material is appropriately defined.
- the first conductivity type cladding layer (4) is made of an AlGaAs-based material, an InGaAs-based material, or an AlGaInP-based material. Materials, InGaP-based materials and the like are used.
- the thickness of the first conductivity type cladding layer (4) is preferably 0.5 to 5 // m, particularly when the first conductivity type low refractive index layer (3) is formed, and 2.0. ⁇ 3.5 jm Is more preferable.
- a reflection region that reflects light in a specific band from the active layer side can be included in the entire cladding layer or a part thereof.
- the reflection region returns light to the active layer side inside the cladding layer, and the first conductivity type low refractive index layer
- the active layer structure (5) is appropriately selected from the viewpoints of wavelength selection, device characteristics, and the like, but its oscillation wavelength must be transparent to the substrate.
- the active layer structure (5) is preferably a system containing In. Most preferred are systems containing InGaAs or systems containing InGaN.
- This substrate is generally used, i.e. G a As the substrate in the case of I nGaAs is also the A 1 2 0 3 in the case of I The InGaN, because it is transparent to pair with it that of the oscillation wavelength It is.
- the active layer various forms such as a bulk active layer and a quantum well active layer can be used. However, it is desirable that at least part of the active layer structure (5) contains an n-type impurity. As a result, stable operation can be realized, particularly when the external cavity is coupled to the laser to which the present invention is applied, and light output linearity is secured over a wide temperature range and a wide light output region. Because.
- the active layer structure when an active layer structure including a quantum well is included, it is preferable that the active layer structure includes at least a layer functioning as a light guide or a barrier and an active layer, and a part of the active layer structure includes an n-type impurity. . Also, the number and order of the light guide layer, the noria layer, and the active layer can be arbitrarily combined so as to exhibit the functions of the respective layers, and include n-type impurities. The part can be arbitrarily selected.
- the active layer structure (5) may be a normal bulk active layer consisting of a single layer, a single quantum well (SQW) structure, a double quantum well (DQW) structure, or a multiple quantum well structure.
- a quantum well structure such as an (MQW) structure may be used.
- a structure in which optical guide layers are provided on both sides of the quantum well (SCH structure), and a structure in which the refractive index is continuously changed by gradually changing the composition of the optical guide layer (GRIN-SCH structure) Etc. can also be adopted.
- the active layer may have a strained quantum well structure for improving the characteristics of the laser.
- the material and the like of the optical guide layer may be selected so as to have a strain opposite to that of the quantum well layer so that the strain is canceled in the entire active layer.
- the optical guide layer is made of an active layer such as an AlGaAs material, an InGaAs material, an InGaP material, an A1GaInP material, an Al InGaAs material, an InGaAsP material, and a GaAsP material.
- the optical guide layer can be a superlattice combining the above materials.
- the second conductive type first clad layer (6) and the second conductive type second clad layer (7) are generally the same as the first conductive type clad layer (4) in average refraction of the active layer structure (5). It is composed of a material having a refractive index smaller than the refractive index, and the material is appropriately defined by the substrate (1), the buffer layer (2), the active layer structure (5), and the like.
- GaAs GaAs is used for the substrate (1) and GaAs is also used for the buffer layer (2)
- A1GaAs, InGaAs, InGaP, AlGalnP materials Materials, Al InGaAs-based materials, InGaAsP-based materials, GaAsP-based materials, etc. are used.
- a reflection area that reflects light in a specific band from the active layer side is provided on all or a part of these layers in order to reduce light seepage into the contact layer described later. You can also.
- the suppression of seepage of light into the contact layer is particularly caused by a thick contact layer exceeding 10 m, and the refractive index n c of the contact layer. nt is effective is larger than the average real part of the refractive index n c E ad 2 for the emission wavelength of the second conductivity type first cladding layer and a second conductivity type second cladding layer before mentioned.
- the current block layer (8) Since the current block layer (8) is literally required to block the current and substantially prevent the current from flowing, its conductivity type is the same as that of the first conductivity type cladding layer (4) or an AND-type. It is preferable that For example, if the current block layer (8) is formed of AlGaAs, The refractive index is preferably smaller than that of the second cladding layer (7) of the second conductivity type made of y As (0 ⁇ y ⁇ 1). That is, the current block layer (8) If (0 ⁇ z ⁇ 1), the mixed crystal ratio is preferably z> y. Further, in relation to y and z, the present invention is preferably used mainly for semiconductor lasers, particularly those in which the waveguide by the laser structure itself is only in the fundamental mode.
- the current blocking layer (8 ) and the effective refractive index difference in the lateral direction which is mainly defined by the refractive index difference of the second conductivity type second cladding layer (7) is desirably in the order of 10- 3. It is preferable to provide a cap layer (9) on the current block layer (8).
- the refractive index of the second-conductivity-type second cladding layer (7) is usually equal to or lower than the refractive index of the active layer structure (5).
- the second conductive type second cladding layer (7) usually has the same refractive index as the first conductive type cladding layer (4) and the second conductive type first cladding layer (6). When a part or all of these layers are formed as a single reflection mirror, it is desirable that the average refractive index of each layer be the same.
- the thickness of the second-conductivity-type cladding layer (7) is preferably 5 to 5 / m, particularly when a second-conductivity-type low-refractive-index layer (10) described later is formed. More preferably, it is 0 to 3.5 m.
- a single reflective mirror layer may be provided for the purpose of suppressing light seeping into the contact layer (11) described later.
- this layer is disposed for the purpose of suppressing light seeping into the contact layer, and is a contact layer having a thickness as large as 10 m or more, and has a refractive index n c of the contact layer.
- nt is the average refractive index for the emission wavelength of the second conductive type first cladding layer and the second conductive type second cladding layer. It is effective when it is larger than the real part of.
- n clad2 is This corresponds to the refractive index of the second conductivity type clad layer in a single layer.
- the second conductivity type low refractive index layer (10) has a refractive index nLIlj2 for the light emission wavelength of the second conductivity type low refractive index layer and a refractive index n c for the light emission wavelength of the contact layer for the purpose . It is preferable that nt and the real part n clad2 of the average refractive index with respect to the emission wavelength of the second conductivity type cladding layer are appropriately selected so as to satisfy the above-mentioned formula 3.
- n c The difference between nt and n clad2 (n cont — n clad2 ) is preferably greater than 0.1, more preferably greater than 0.15 .
- the material, thickness, structure and the like of the second conductivity type low refractive index layer can be appropriately selected similarly to the first conductivity type low refractive index layer.
- T LIL2 it is desirable that the above equation 4 be satisfied with the oscillation wavelength as a person. It is preferably larger than T LIL ⁇ iA / 10, more preferably larger than person / 7.
- the contact layer (11) is usually made of a GaAs material. This layer usually has a higher carrier concentration than the other layers in order to lower the contact resistivity with the electrode.
- the thickness of the contact layer is appropriately selected, but the second conductivity type low refractive index layer works effectively when the contact layer is thick.
- each layer constituting the light emitting element is appropriately selected within a range in which the function of each layer is effectively exhibited.
- the buffer layer (2) usually has a thickness of 0.1 to 3 / m
- the first conductivity type cladding layer (4) has a thickness of 0.5 to 5 m
- the thickness of the layer structure (5) is 0.0005 to 0.02 ⁇ m per layer in the case of the quantum well structure
- the thickness of the first conductivity type second cladding layer (6) is 0.05 to 0.05 ⁇ m.
- the thickness of the second conductive type cladding layer (7) is 0.5 to 5 ⁇ m
- the thickness of the current blocking layer (8) is 0.3 to 2 ⁇ m
- the thickness of the cap layer (9) is 0.5 to 0.5 ⁇ m.
- the thickness of the contact layer (11) is selected from the range of 1 to 25 mm.
- the semiconductor laser shown in FIG. 1 is manufactured by further forming electrodes (12) and (13).
- the p-type electrode (12) is formed by sequentially depositing, for example, Ti / Pt / Au on the surface of the contact layer (11) in the case of the p-type, and then performing an alloying process.
- the substrate-side electrode (13) is formed on the surface of the substrate (1) .
- AuGe / Ni / Au is sequentially deposited on the substrate surface and then formed by alloying. .
- an end surface which is a light emission surface is formed on the manufactured semiconductor wafer.
- light emission is not limited to edge emission, but is preferably used for edge emission type devices.
- the end face becomes a mirror constituting a resonator.
- the end face is formed by cleavage. Cleavage is a widely used method, and the end face formed by cleavage depends on the orientation of the substrate used. For example, when an element such as an edge-emitting laser is formed using a substrate having a plane which is crystallographically equivalent to nom inly ly (100), which is preferably used, (110) or crystallographic
- the surface that is equivalent in nature is the surface that forms the resonator.
- the end face may not be at 90 degrees to the resonator direction depending on the relationship between the inclined direction and the resonator direction. For example, if a substrate is used that is inclined at 2 degrees from the (100) substrate toward the (1-10) direction, the end face will also be inclined at 2 degrees.
- coating layers (15) and (16) made of a dielectric or a combination of a dielectric and a semiconductor on the exposed semiconductor end face (FIG. 2).
- the coating layer is formed mainly for the purpose of increasing the light extraction efficiency from the semiconductor laser and for protecting the end face.
- a coating layer having a low reflectance (less than 10% reflectance) for the oscillation wavelength is applied to the front end face, and a high reflectance (for the oscillation wavelength) is applied.
- a coating layer for example, 80% or more
- the reflectance of the front end face is preferably 5%, more preferably 2.5% or less.
- Various materials can be used for the coating layers (15) and (16).
- A1Ox, TiOx, Siox, etc. are used as coating layers with low reflectivity, and A1Ox / Si multilayers, Tiox / Si, as coating layers with high reflectivity.
- An Ox multilayer film or the like is used. By adjusting the thickness of each layer, a desired reflectance can be realized. However, in general, the film thickness of A 1 Ox, T iOXs S i Ox, etc.
- the coating layer with low reflectivity is adjusted so that the real part of the refractive index at that wavelength is n, and it is near / 4n. It is common to do. Also, in the case of a high-reflection multilayer film, it is general to adjust each material constituting the film so as to be in the vicinity of / 4n.
- the production method of the basic epitaxy structure of various lasers including the example of FIG. 1 can be referred to, for example, JP-A-8-130344.
- This type of laser is used as a light source for an optical fiber amplifier used for optical communication and the like, and can be applied to various uses by appropriately selecting a layer structure, a material to be used, and the like.
- the fiber grating can appropriately select the center wavelength, the reflection or transmission band, the reflectance of light to the laser side of the fiber grating, and the like according to the purpose.
- the reflectance of light to the laser side of the fiber grating is 2 to 15%, preferably 5 to 10% at the oscillation wavelength of the light emitting element, and its reflection band. Is preferably from 0.1 to 5.Onm, more preferably from 0.5 to 1.5 nm, with respect to the center wavelength.
- the group type semiconductor laser shown in FIGS. 1 and 2 was manufactured according to the following procedure.
- type eight 1 0 of the second carrier concentration in a thickness 0.5 L ⁇ m as conductivity-type first cladding layer (6) 1 X 10 18 0111- 3 35 0 & 0. 65 eight three-layer (refractive index at 98 onm 3. 3346);.. n -type Al 0 the carrier concentration 5 x 10 17 cm- 3 in a thickness of 0.5 5 ⁇ M as a current proc layer (8) 39 Ga 0 61 as layer (refractive index at 980 nm 3. 30 69); carrier concentration 1 x 10 18 cm one 3 in a thickness of 10 nm as a cap layer (9) Were sequentially laminated.
- Si was used as the n-type impurity
- Be was used as the p-type impurity.
- a mask of silicon nitride was provided on a portion other than the current injection region of the uppermost layer. At this time, the width of the stripe-shaped opening of the silicon nitride mask was 1.5 ⁇ m. Then, using a mixture of sulfuric acid (98% by weight), hydrogen peroxide (30% by weight aqueous solution) and water at a volume ratio of 1: 1: 5, the cap layer and the current block layer were etched at 25 ° C. The etching was performed for 27 seconds until the first conductive type first clad layer was reached. Next, the silicon nitride layer was removed by immersion in a mixture of HF (49%) and NH 4 F (40%) at a ratio of 1: 6 for 2 minutes and 30 seconds.
- the carrier concentration is 1 ⁇ 10 18 as the second conductivity type second clad layer (7) by MOCVD.
- Type eight 1 0 consecutive to the carrier concentration in the thickness 0. 15 m as a second-conductivity-type low-refractive layer (10) 1 X 10 18 0111- 3. 7 Ga 0. 3 As layer (refractive index 3 in 98 onm . 1387);
- a contact layer for maintaining a contact between the electrode (11) is grown p-type GaAs layer having a carrier concentration 1 X 10 19 cm- 3 (refractive index at 980 nm 3. 5252) with a thickness 7 ⁇ M Was.
- Zn was used as the p-type impurity.
- the width W of the current injection region was 2.2 m.
- the difference between the refractive index of the current block layer (8) and the second conductive type second cladding layer (7), and the width of W are designed so that the waveguide mode becomes only the fundamental mode.
- the A1 mixed crystal ratio of the block layer and the like was determined.
- the substrate is polished to a thickness of 100 ⁇ m, and AuGeN i / Au is used as the n-type electrode (13) on the substrate side, and T is used as the p-type electrode on the epitaxial layer side electrode (12).
- the laser bar was once removed from the vacuum layer in order to further process the rear end face.
- a coating layer (16) was formed, and a rear end face with a reflectance of 92% was formed.
- Fig. 5 shows the results of detailed examination of the current-light output characteristics of the fabricated semiconductor laser in the range of 200mA to 300mA at 25 ° C.
- Figure 6 shows the derivative of this (slope efficiency (W / A)). As shown in Fig. 5, it was confirmed that the light output increased linearly with the injection current. In this case, it was confirmed that the fluctuation of the slope efficiency was as small as ⁇ 0.05 (W / A).
- the peak wavelength person p is the wavelength showing the maximum relative intensity
- the center wavelength person c is the center of gravity of the entire oscillation wavelength. Both persons p and c showed a relatively linear redshift tendency, and it was confirmed that the maximum wavelength jump was 1 nm or less. In addition, no intensity modulation with respect to the oscillation wavelength at a wide wavelength interval derived from the substrate was observed.
- a semiconductor laser module was fabricated in which a grating fiber with a reflectance of 6.5% at 981 nm and a reflection band of 1 nm was placed on the front end face of the laser.
- the tracking error of the entire module was measured with the light output from the grating fiber as a parameter while changing the ambient temperature of the semiconductor laser module.
- the c tracking error is constant with the built-in photodiode. This is the fluctuation of the optical output from the fiber when such control is performed, and is an index of the coupling characteristics with the external resonator.
- the built-in photodiode controls the optical output to be 100mW, 140mW, and 180mW as the output of one end of the fiber, and the tracking error when the temperature is changed from 5 ° C to 40 ° C is good within ⁇ 0.3 dB. Was confirmed.
- a semiconductor laser was fabricated in the same manner as in Example 1, except that the second conductivity type low refractive index layer (10) was not provided, and the thickness of the contact layer (11) was 3.5 ⁇ m.
- the current-optical output characteristics of the fabricated semiconductor laser were examined in detail in the range of 200 mA to 300 mA at 25 ° C. As a result, it was confirmed that the optical output increased linearly with the injection current. In addition, it was confirmed that the variation of slope efficiency in this case was as small as ⁇ 0.06 (W / A).
- Example 1 the same semiconductor laser module as in Example 1 was manufactured, and tracking error was measured.
- the optical output is controlled by the built-in photodiode so that it is 100mW, 140mW, and 180mW as the output of one end of the fiber, and the temperature is from 5 ° C to 40. It was confirmed that the tracking error when changing to C was as good as ⁇ 0.35 dB. (Example 3)
- a semiconductor laser was fabricated in the same manner as described above.
- Example 1 the same semiconductor laser module as in Example 1 was manufactured, and tracking error was measured.
- the optical output is controlled by the built-in photodiode so that it is 100 mW, 140 mW, and 180 mW as one fiber output, and the tracking error when the temperature is changed from 5 ° C to 40 ° C is within ⁇ 0.32 dB. It was confirmed that there was. (Example 4)
- Example 2 Same as Example 1 except that the thickness of the first conductivity type cladding layer and the thickness of the second conductivity type second cladding layer were 2.2 urn, and the thickness of the contact layer (11) was 3.5 ⁇ m. Thus, a semiconductor laser was manufactured.
- the current-optical output characteristics of the fabricated semiconductor laser were examined in detail in the range of 200 mA to 300 mA in an environment of 25 degrees. As a result, it was confirmed that the optical output increased linearly with the injection current. In addition, it was confirmed that the variation of the slope efficiency in this case was very small, within ⁇ 0.04 (W / A).
- Example 2 the same semiconductor laser module as in Example 1 was manufactured, and tracking error was measured.
- the built-in photodiode controls the optical output to be 100 mW, 140 mW, and 180 mW as the output of one end of the fiber, and the tracking error when the temperature is changed from 5 degrees to 40 degrees is within ⁇ 0.27 dB. Very good was confirmed.
- a semiconductor laser was fabricated in the same manner as in Example 1 except that the thickness of the substrate (1) was changed to 50 ⁇ m.
- the current-optical output characteristics of the fabricated semiconductor laser were examined in detail in the range of 200 mA to 300 mA at 25 ° C. As a result, it was confirmed that the optical output increased linearly with the injection current. Also, it was confirmed that the variation of the slope efficiency in this case was as small as ⁇ 0.035 (W / A).
- Example 2 Further, a semiconductor laser module similar to that of Example 1 was manufactured, and a tracking error was measured.
- the built-in photodiode controls the optical output to be 100mW, 140mW, and 180mW as the output of one end of the fiber, and the tracking error when the temperature is changed from 5 ° C to 40 ° C is within ⁇ 0.28 dB. It was confirmed that it was good. (Example 6)
- Example 1 Except that the first conductivity type low refractive index layer (3) and the second conductivity type low refractive index layer (10) were not formed, and that the substrate (1) was polished to a thickness of 70 m.
- a semiconductor laser was manufactured in the same procedure as in Example 1.
- the current-light output characteristics of the fabricated semiconductor laser were examined in the range of 250 mA to 300 mA in an environment of 25 ° C, and the variation of the derivative (slope efficiency (W / A)) was confirmed. It was confirmed that the optical output increased linearly with the injection current, and that the variation in slope efficiency in this case was as small as ⁇ 0.07 (W / A).
- a semiconductor laser module was fabricated with a grating fiber with a reflectance of 6.5% at 981 nm and a reflection band of In on the laser front end face.
- the tracking error of the entire module was measured using the light output from the grating fiber as a parameter while changing the ambient temperature of the semiconductor laser module.
- the tracking error is the light output from the built-in photodiode. This is the fluctuation of the optical output when the control is performed to keep it constant, and is an index of the coupling characteristics with the external resonator.
- a semiconductor laser was fabricated in the same manner as in Example 1 except that the first conductivity type low refractive index layer (3) and the second conductivity type low refractive index layer (10) were not provided.
- Fig. 9 shows the results of detailed examination of the current-light output characteristics of the fabricated semiconductor laser in the range of 200 ⁇ to 300mA at 25 ° C.
- Figure 10 shows the derivative of this (slope efficiency (W / A)).
- slope efficiency W / A
- the tracking error was as large as 0.6 dB when the optical output was 100 mW, 140 mW, and 180 mW at one end of the fiber and the temperature was changed from 5 ° C to 40 ° C.
- a semiconductor laser was manufactured in the same manner as in Example 6, except that the thickness of the substrate was set to 120 / m.
- the current-light output characteristics of the fabricated semiconductor laser were examined in detail in the range of 250 mA to 300 mA at 25 ° C, and the derivative (slope efficiency (W / A)) of this was also determined. It was confirmed that there was a portion where the optical output was not linear with respect to the injected current, centered around 275 mA. The variation in slope efficiency was large throughout, exceeding 1.1 W / A at the maximum and less than 0.72 W / A at the minimum. In the same range, the changes in the peak wavelength P and the center wavelength c were examined. Both human p and Ac showed a step-like change, and intensity modulation at wide wavelength intervals derived from the substrate was observed. The maximum wavelength jump was about 2.8 nm.
- a semiconductor laser module similar to that of Example 6 was manufactured, and the tracking error of the entire module was measured.
- the light emitting device of the present invention suppresses competition of oscillation wavelengths related to a waveguide mode derived from the substrate and intensity modulation between oscillation spectra, which are observed when the substrate is transparent to the emission wavelength. It shows excellent light output linearity and coupling characteristics with an external resonator. Further, the light emitting element module of the present invention operates stably in a wide temperature range and a wide output range. others Therefore, the application range of the light emitting device and the light emitting device module of the present invention is extremely wide.
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00939083A EP1146615A4 (en) | 1999-09-22 | 2000-06-16 | LUMINOUS ELEMENT AND LUMINOUS ELEMENT MODULE |
US09/860,828 US7102174B2 (en) | 1999-09-22 | 2001-05-21 | Light emitting device and light emitting device module |
US11/253,547 US7164157B2 (en) | 1999-09-22 | 2005-10-20 | Light emitting device and light emitting device module |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP26854399A JP2001094198A (ja) | 1999-09-22 | 1999-09-22 | 発光素子および発光素子モジュール |
JP26854299A JP4163343B2 (ja) | 1999-09-22 | 1999-09-22 | 発光素子および発光素子モジュール |
JP11/268542 | 1999-09-22 | ||
JP11/268543 | 1999-09-22 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/860,828 Continuation US7102174B2 (en) | 1999-09-22 | 2001-05-21 | Light emitting device and light emitting device module |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001022545A1 true WO2001022545A1 (fr) | 2001-03-29 |
Family
ID=26548360
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2000/003947 WO2001022545A1 (fr) | 1999-09-22 | 2000-06-16 | Element lumineux et module d'element lumineux |
Country Status (3)
Country | Link |
---|---|
US (2) | US7102174B2 (ja) |
EP (1) | EP1146615A4 (ja) |
WO (1) | WO2001022545A1 (ja) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1146615A4 (en) * | 1999-09-22 | 2005-10-19 | Mitsubishi Chem Corp | LUMINOUS ELEMENT AND LUMINOUS ELEMENT MODULE |
US20040119080A1 (en) * | 2002-08-12 | 2004-06-24 | Hashimoto Jun-Ichi | Semiconductor optical device |
US7276390B2 (en) * | 2002-08-29 | 2007-10-02 | Avago Technologies General Ip Pte Ltd | Long wavelength indium arsenide phosphide (InAsP) quantum well active region and method for producing same |
US7083993B2 (en) * | 2003-04-15 | 2006-08-01 | Luminus Devices, Inc. | Methods of making multi-layer light emitting devices |
JP4091529B2 (ja) * | 2003-11-20 | 2008-05-28 | ローム株式会社 | 半導体レーザ |
JP5507792B2 (ja) * | 2004-09-16 | 2014-05-28 | 三星電子株式会社 | Iii族窒化物半導体光素子 |
TW200735418A (en) * | 2005-11-22 | 2007-09-16 | Rohm Co Ltd | Nitride semiconductor device |
TWI423467B (zh) * | 2007-06-06 | 2014-01-11 | Epistar Corp | 半導體發光裝置 |
EP2015412B1 (en) | 2007-07-06 | 2022-03-09 | Lumentum Operations LLC | Semiconductor laser with narrow beam divergence. |
TWI384709B (zh) * | 2007-12-31 | 2013-02-01 | Ind Tech Res Inst | 雷射整形模組 |
WO2010022526A2 (en) * | 2008-08-26 | 2010-03-04 | Exalos Ag | Superluminescent diode, or amplifier chip |
JP5463760B2 (ja) * | 2009-07-02 | 2014-04-09 | 三菱電機株式会社 | 光導波路集積型半導体光素子およびその製造方法 |
JP6195205B2 (ja) | 2012-10-19 | 2017-09-13 | パナソニックIpマネジメント株式会社 | 半導体レーザ |
US11038320B2 (en) * | 2018-08-22 | 2021-06-15 | Lumentum Operations Llc | Semiconductor layer structure with a thick buffer layer |
CN116169558B (zh) * | 2023-03-29 | 2023-12-08 | 安徽格恩半导体有限公司 | 一种具有衬底模式抑制层的半导体激光器 |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0227865A1 (en) * | 1985-10-15 | 1987-07-08 | Kabushiki Kaisha Toshiba | Light emitting semiconductor device |
JPH01292874A (ja) * | 1988-05-20 | 1989-11-27 | Hitachi Ltd | 半導体レーザ素子 |
JPH02170486A (ja) * | 1988-12-23 | 1990-07-02 | Hitachi Ltd | 半導体発光装置 |
JPH0837340A (ja) * | 1994-05-06 | 1996-02-06 | Furukawa Electric Co Ltd:The | 面発光半導体素子 |
JPH08228048A (ja) * | 1994-12-22 | 1996-09-03 | Nichia Chem Ind Ltd | 窒化物半導体レーザ素子 |
JPH09214048A (ja) * | 1996-02-05 | 1997-08-15 | Matsushita Electron Corp | 半導体レーザ装置 |
JPH10209570A (ja) * | 1997-01-20 | 1998-08-07 | Furukawa Electric Co Ltd:The | 光モジュール |
US5793062A (en) * | 1995-08-10 | 1998-08-11 | Hewlett-Packard Company | Transparent substrate light emitting diodes with directed light output |
JPH10242565A (ja) * | 1997-02-21 | 1998-09-11 | Pioneer Electron Corp | 半導体レーザ |
JPH10303459A (ja) * | 1997-04-23 | 1998-11-13 | Sharp Corp | 窒化ガリウム系半導体発光素子およびその製造方法 |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07193333A (ja) | 1993-12-27 | 1995-07-28 | Mitsubishi Chem Corp | 半導体発光素子 |
TW347597B (en) | 1994-01-31 | 1998-12-11 | Mitsubishi Chem Corp | Method of forming a groove in a semiconductor laser diode and a semiconductor laser diode |
US6130147A (en) * | 1994-04-07 | 2000-10-10 | Sdl, Inc. | Methods for forming group III-V arsenide-nitride semiconductor materials |
EP0695007B1 (en) | 1994-07-04 | 2000-06-14 | Mitsubishi Chemical Corporation | Semiconductor device and its fabrication process |
US6005263A (en) * | 1995-03-27 | 1999-12-21 | Kabushiki Kaisha Toshiba | Light emitter with lowered heterojunction interface barrier |
JPH08279650A (ja) * | 1995-04-06 | 1996-10-22 | Mitsubishi Electric Corp | 半導体レーザ装置、及び半導体レーザ装置の製造方法 |
US5659568A (en) * | 1995-05-23 | 1997-08-19 | Hewlett-Packard Company | Low noise surface emitting laser for multimode optical link applications |
US6172998B1 (en) | 1996-11-18 | 2001-01-09 | Mitsubishi Chemical Corporation | Semiconductor laser diode |
US5870417A (en) * | 1996-12-20 | 1999-02-09 | Sdl, Inc. | Thermal compensators for waveguide DBR laser sources |
EP0898345A3 (en) | 1997-08-13 | 2004-01-02 | Mitsubishi Chemical Corporation | Compound semiconductor light emitting device and method of fabricating the same |
JP3814432B2 (ja) | 1998-12-04 | 2006-08-30 | 三菱化学株式会社 | 化合物半導体発光素子 |
EP1146615A4 (en) * | 1999-09-22 | 2005-10-19 | Mitsubishi Chem Corp | LUMINOUS ELEMENT AND LUMINOUS ELEMENT MODULE |
US6791181B2 (en) | 2000-11-29 | 2004-09-14 | Mitsubishi Chemical Corporation | Semiconductor light emitting device |
US20050201439A1 (en) * | 2002-09-06 | 2005-09-15 | Mitsubishi Chemical Corporation | Semiconductor light emitting device and semiconductor light emitting device module |
US7792170B2 (en) * | 2002-09-20 | 2010-09-07 | Mitsubishi Chemical Corporation | Semiconductor laser |
-
2000
- 2000-06-16 EP EP00939083A patent/EP1146615A4/en not_active Withdrawn
- 2000-06-16 WO PCT/JP2000/003947 patent/WO2001022545A1/ja not_active Application Discontinuation
-
2001
- 2001-05-21 US US09/860,828 patent/US7102174B2/en not_active Expired - Fee Related
-
2005
- 2005-10-20 US US11/253,547 patent/US7164157B2/en not_active Expired - Fee Related
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0227865A1 (en) * | 1985-10-15 | 1987-07-08 | Kabushiki Kaisha Toshiba | Light emitting semiconductor device |
JPH01292874A (ja) * | 1988-05-20 | 1989-11-27 | Hitachi Ltd | 半導体レーザ素子 |
JPH02170486A (ja) * | 1988-12-23 | 1990-07-02 | Hitachi Ltd | 半導体発光装置 |
JPH0837340A (ja) * | 1994-05-06 | 1996-02-06 | Furukawa Electric Co Ltd:The | 面発光半導体素子 |
JPH08228048A (ja) * | 1994-12-22 | 1996-09-03 | Nichia Chem Ind Ltd | 窒化物半導体レーザ素子 |
US5793062A (en) * | 1995-08-10 | 1998-08-11 | Hewlett-Packard Company | Transparent substrate light emitting diodes with directed light output |
JPH09214048A (ja) * | 1996-02-05 | 1997-08-15 | Matsushita Electron Corp | 半導体レーザ装置 |
JPH10209570A (ja) * | 1997-01-20 | 1998-08-07 | Furukawa Electric Co Ltd:The | 光モジュール |
JPH10242565A (ja) * | 1997-02-21 | 1998-09-11 | Pioneer Electron Corp | 半導体レーザ |
JPH10303459A (ja) * | 1997-04-23 | 1998-11-13 | Sharp Corp | 窒化ガリウム系半導体発光素子およびその製造方法 |
Non-Patent Citations (3)
Title |
---|
IVAN A. AVRUTSKY ET AL.: "Investigations of the spectral characteristics of 980-nm InGaAs-GaAs-AlGaAs laser", IEEE JOURNAL OF QUANTUM ELECTRONICS, vol. 33, no. 10, 1997, pages 1801 - 1809, XP002930799 * |
M. SUGO ET AL.: "Development of 1.02-mum pump laser diodes, OSA TOPS on optical amplifiers and their applications", vol. 5, 1996, pages 101 - 104, XP002930798 * |
See also references of EP1146615A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP1146615A4 (en) | 2005-10-19 |
US20060038185A1 (en) | 2006-02-23 |
US7164157B2 (en) | 2007-01-16 |
EP1146615A1 (en) | 2001-10-17 |
US20020014674A1 (en) | 2002-02-07 |
US7102174B2 (en) | 2006-09-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7164157B2 (en) | Light emitting device and light emitting device module | |
US7796663B2 (en) | Semiconductor laser device | |
US20050201439A1 (en) | Semiconductor light emitting device and semiconductor light emitting device module | |
US7792170B2 (en) | Semiconductor laser | |
US7830940B2 (en) | Nitride semiconductor laser element having nitride semiconductor substrate and nitride semiconductor layer laminated thereon with nitride semiconductor substrate and nitride semiconductor layer having recesses formed in high dislocation density region of nitride semiconductor substrate and nitride semiconductor layer having portions with different film thicknesses | |
US6472691B2 (en) | Distributed feedback semiconductor laser device | |
JP3242192B2 (ja) | 半導体レーザ素子 | |
JP4629949B2 (ja) | 面発光レーザ素子、面発光レーザ素子を用いたトランシーバ、光送受信器および光通信システム | |
JP2007184526A (ja) | スーパールミネッセントダイオードおよびその製造方法 | |
TW201314945A (zh) | 發光元件及其製造方法 | |
JP3859839B2 (ja) | 屈折率導波型半導体レーザ装置 | |
JP2009260093A (ja) | 光半導体装置 | |
JP4345673B2 (ja) | 半導体レーザ | |
JP4163343B2 (ja) | 発光素子および発光素子モジュール | |
JP2004103679A (ja) | 半導体発光素子および半導体発光素子モジュール | |
JP2008004958A (ja) | 発光素子および発光素子モジュール | |
JP2019102581A (ja) | 光半導体集積装置、光半導体集積装置の製造方法および光通信システム | |
JP2004087564A (ja) | 半導体レーザ素子及びその製造方法 | |
JP5184804B2 (ja) | 半導体レーザ、それを備えたレーザモジュールおよび半導体レーザの製造方法 | |
JP4208910B2 (ja) | GaN系レーザ素子 | |
JP4314758B2 (ja) | 半導体レーザ素子 | |
JP2001094198A (ja) | 発光素子および発光素子モジュール | |
JP2003174231A (ja) | GaN系半導体レーザ素子 | |
WO2004023614A1 (ja) | 半導体発光素子および半導体発光素子モジュール | |
WO2000042685A1 (fr) | Laser a semi-conducteur, a puits quantiques multiples, a dopage module de type n |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 09860828 Country of ref document: US |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2000939083 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 2000939083 Country of ref document: EP |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 2000939083 Country of ref document: EP |