WO2020058082A1 - Gewinngeführter halbleiterlaser und herstellungsverfahren hierfür - Google Patents
Gewinngeführter halbleiterlaser und herstellungsverfahren hierfür Download PDFInfo
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- WO2020058082A1 WO2020058082A1 PCT/EP2019/074362 EP2019074362W WO2020058082A1 WO 2020058082 A1 WO2020058082 A1 WO 2020058082A1 EP 2019074362 W EP2019074362 W EP 2019074362W WO 2020058082 A1 WO2020058082 A1 WO 2020058082A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/20—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
- H01S5/2205—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 comprising special burying or current confinement layers
- H01S5/2214—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 comprising special burying or current confinement layers based on oxides or nitrides
- H01S5/2215—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 comprising special burying or current confinement layers based on oxides or nitrides using native oxidation of semiconductor layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
- H01S5/0421—Electrical excitation ; Circuits therefor characterised by the semiconducting contacting layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
- H01S5/0425—Electrodes, e.g. characterised by the structure
- H01S5/04256—Electrodes, e.g. characterised by the structure characterised by the configuration
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/065—Mode locking; Mode suppression; Mode selection ; Self pulsating
- H01S5/0651—Mode control
- H01S5/0653—Mode suppression, e.g. specific multimode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/20—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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S2301/00—Functional characteristics
- H01S2301/16—Semiconductor lasers with special structural design to influence the modes, e.g. specific multimode
- H01S2301/166—Single transverse or lateral mode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S2301/00—Functional characteristics
- H01S2301/17—Semiconductor lasers comprising special layers
- H01S2301/176—Specific passivation layers on surfaces other than the emission facet
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/20—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
- H01S5/2205—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 comprising special burying or current confinement layers
- H01S5/2206—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 comprising special burying or current confinement layers based on III-V materials
- H01S5/221—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 comprising special burying or current confinement layers based on III-V materials containing aluminium
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/20—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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/30—Structure or shape of the active region; Materials used for the active region
- H01S5/32—Structure or shape of the active region; Materials used for the active region comprising PN junctions, e.g. hetero- or double- heterostructures
- H01S5/323—Structure or shape of the active region; Materials used for the active region comprising PN junctions, e.g. hetero- or double- heterostructures in AIIIBV compounds, e.g. AlGaAs-laser, InP-based laser
- H01S5/32308—Structure or shape of the active region; Materials used for the active region comprising PN junctions, e.g. hetero- or double- heterostructures in AIIIBV compounds, e.g. AlGaAs-laser, InP-based laser emitting light at a wavelength less than 900 nm
- H01S5/32316—Structure or shape of the active region; Materials used for the active region comprising PN junctions, e.g. hetero- or double- heterostructures in AIIIBV compounds, e.g. AlGaAs-laser, InP-based laser emitting light at a wavelength less than 900 nm comprising only (Al)GaAs
Definitions
- a profit-led semiconductor laser is specified.
- One problem to be solved is to specify a profit-led semiconductor laser that shows the high optical quality of an emitted laser mode.
- the semiconductor laser is a profit-led semiconductor laser. That is, a fashion guide in the direction transverse to one
- the resonator axis is not caused by jumps in refractive index, for example by ridge waveguides or Refractive index jumps are caused, but one
- Semiconductor laser is defined by an energization area of an active zone. So that's one
- Semiconductor laser is a semiconductor layer sequence.
- Semiconductor layer sequence contains at least one active zone for generating radiation and thus for generating the laser radiation.
- the semiconductor layer sequence comprises one or, preferably, two waveguide layers.
- the at least one waveguide layer is located on the active zone, preferably directly on the active zone.
- Waveguide layer in particular together with the active zone, has a comparatively high optical
- Refractive index for the laser radiation so that the waveguide layer can be guided in a direction parallel to a growth direction of the semiconductor layer sequence.
- the semiconductor layer sequence contains one or, preferably, two cladding layers.
- Cladding layer is on the associated
- Waveguide layer It is possible that at least one cladding layer is located directly on the assigned waveguide layer.
- the at least one cladding layer faces of the associated waveguide layer has a comparatively low refractive index in order to guide the waveguide
- the semiconductor layer sequence is preferably based on a III-V compound semiconductor material.
- the semiconductor material is, for example, a nitride
- Phosphide compound semiconductor material such as
- Compound semiconductor material such as Al n In ] __ nm Ga m As or like Al n Ga m In ] __ nm As P ] _-k, where 0 dn ⁇ 1, 0 dm ⁇ 1 and n + m ⁇ 1 and 0 dk ⁇ 1 is.
- the semiconductor layer sequence is preferably based on the
- Semiconductor layer sequence also one or more
- Current aperture layer is thus set up to define an energized area of the active zone.
- a definition of the resonator axis also takes place via the current diaphragm layer.
- the semiconductor laser is therefore one
- Edge areas which follow the central area in the direction away from the resonator axis, each have at least a minimum width. This means that a width of the edge areas can be at the minimum width or the edge areas have a width that is greater than the minimum width.
- the minimum width is at least 3 ⁇ m or 5 ⁇ m. As an alternative or in addition, the minimum width is at most 100 ⁇ m or 50 ⁇ m or 20 ⁇ m or 10 ⁇ m. The minimum width is preferably between 5 ⁇ m and 10 ⁇ m.
- the electrical contact surfaces are for immediate Current injection set up in the semiconductor layer sequence.
- the electrical contact areas are preferably composed of one or more metal layers, wherein layers of a transparent conductive oxide can optionally also be present.
- the electrical contact surfaces are preferably metallic structures.
- the active zone and in particular a current-carrying area of the active zone is located between the electrical contact areas.
- the electrical are seen in a top view of the semiconductor layer sequence
- the semiconductor layer sequence and the electrical contact areas are or at least one
- Contact areas in the central area and beyond on both sides, at least up to the minimum width, are unstructured and continuous components, preferably applies in at least one cross section perpendicular to the resonator axis and parallel to the direction of growth of the semiconductor layer sequence. This applies in particular to all cross sections perpendicular to the resonator axis in a range of at least 80% or 90% of the length of the resonator axis. It is possible that
- the semiconductor layer sequence comprises an active zone for generating radiation, at least one waveguide layer on the active zone and at least one cladding layer on the at least one
- Waveguide layer comprises at least one current diaphragm layer that runs along one
- Resonator axis of the semiconductor laser is electrically conductive in a central region and electrically insulating in subsequent edge regions.
- the central region has a width of at least 10 ⁇ m across the resonator axis and the edge regions have at least a minimum width.
- the minimum width is 3 ym or more. Seen in plan view, the semiconductor layer sequence and at least that
- a trench extends along both sides of the resonator axis and the trenches laterally expose the current diaphragm layer and cut through the entire semiconductor layer sequence down to a substrate, and the trenches are in particular for this purpose set up to suppress parasitic modes so that the trenches are oblique to a growth direction of the
- Semiconductor layer sequence have extending side surfaces.
- GaAs and AlGaAs are under pressure and therefore under
- the direction of growth of the semiconductor layer sequence also referred to as slow axis divergence, is impaired.
- the profit-guided semiconductor laser described here which is in particular in the form of a broad-strip laser, structural edges and thus tension in a current-carrying region which generates the laser radiation are avoided.
- the radiation angle in a plane perpendicular to a growth direction of the semiconductor layer sequence can thus be controlled and birefringence at edge regions of a region that is energized and provided for generating laser radiation can be avoided or at least strongly
- Gain the width of the current expansion, and thus the profit guidance, being essentially current-independent, which leads to more stable electro-optical properties.
- a selectively oxidizable epitaxially grown layer that is to say the current aperture layer, is integrated in the semiconductor layer sequence.
- Such layers are known, for example, from vertically emitting lasers, but are used in such lasers to limit an emitting region.
- lasers with an index guide, especially with ridge waveguides are known, for example, from vertically emitting lasers, but are used in such lasers to limit an emitting region.
- Edge areas so that the edge areas are in particular so wide that optical modes supported in the semiconductor laser are shielded by the edge areas from structures lying outside the edge areas.
- edge regions of a current diaphragm layer have to be so narrow that an optical mode due to the index guidance
- the semiconductor laser described here is accurate
- trenches along the resonator axis on both sides and along the resonator axis. This means that the resonator axis is located between two trenches when viewed from above.
- the trenches preferably extend along the entire
- Resonator axis The current aperture layer is exposed laterally through the trenches.
- the trenches cut through the semiconductor layer sequence at least as far as the active zone. It is also possible that the trenches cover the entire
- the active zone can have the same width as the current diaphragm layer and the current diaphragm layer and the active zone can be congruent or essentially congruent when viewed in plan view. Essentially means for example with a tolerance of at most 1 ym or 0.5 ym or 0.2 ym.
- the active zone is usually below a ridge waveguide and thus has a greater width than the ridge waveguide itself.
- Waveguide layers and the associated cladding layer Waveguide layers and the associated cladding layer.
- Current aperture layer may be arranged.
- the current aperture layer is in the
- Cladding layer or on a side of the cladding layer facing away from the active zone. However, that is preferred
- Waveguide layer is located.
- a distance between the current diaphragm layer and the active zone is at least 0.5 ⁇ m or 0.8 ⁇ m. Alternatively or additionally, this distance is at most 2 ym or 1.5 ym.
- the current diaphragm layer is approximately 1 ⁇ m from the active zone.
- the thickness of the current aperture layer is at most 100 nm or 70 nm or 50 nm.
- the current aperture layer formed in the central region from a III-V semiconductor material.
- the current aperture layer comprises one or more III oxides
- this difference in thickness is at most 3% or 2% or 1% of the mean thickness of the central region.
- this difference in thickness is at least 0.1% or 0.3% of the average thickness of the central region.
- the current aperture layer in the central region is preferably made of Al ] __ z Ga z As.
- Z is preferably greater than or equal to 0.005 or greater than or equal to 0.01.
- z is at most 0.05 or 0.03 or 0.025.
- the current aperture layer in the central area is therefore essentially made of AlAs with only a small Ga content.
- layers of the Semiconductor layer sequence has an aluminum content of at least 5% or 10% or 20% and / or at most 60% or 40% or 50%. Such to the semiconductor layer sequence
- adjacent layers are in particular made of AlInGaAs or AlGaAs. These layers can represent the cladding layers and / or the waveguide layers.
- the facets are for reflection and / or for decoupling one generated during operation
- the facets are preferably generated by means of columns of the semiconductor layer sequence. It is possible that passivation layers and / or layers for setting a reflectivity are present on the facets.
- the facets are free of electrically insulating regions of the current diaphragm layer at least in one radiation decoupling region. The generated one occurs in the radiation decoupling area
- the edge regions of the current diaphragm layer extend along the resonator axis in the semiconductor layer sequence with a constant width.
- the facet in the central region is preferably free of an electrically insulating area of the current-aperture layer, so that current can be released from the active zone at the Facets can be achieved in particular by a geometry of the electrical contact surfaces.
- a width of the edge regions of the current diaphragm layer is equal to that
- Minimum width This applies preferably with a tolerance of at most 1 ⁇ m or 0.5 ⁇ m or 0.2 ⁇ m. This means that the electrical contact surfaces can end flush with the semiconductor layer sequence.
- Contact surfaces directly on the semiconductor layer sequence and the semiconductor layers can be congruent or approximately congruent when viewed in plan view.
- a width of the edge regions is greater than the minimum width. This means that the semiconductor layer sequence is then wider than at least one of the electrical contact areas, in particular wider than the electrical contact area directly on the
- Current diaphragm layer is then preferably located in a p-conducting region of the semiconductor layer sequence. This means that the current aperture layer can be located between the active zone and the electrical contact area designed as an anode.
- Semiconductor laser exactly two of the current aperture layers.
- the active zone is located between the current shutter layers.
- one of the current diaphragm layers lies in a p- conductive region of the semiconductor layer sequence and the other of the current diaphragm layers in an n-conductive region of the semiconductor layer sequence.
- Emission wavelength or wavelength of maximum intensity of the laser radiation generated by the semiconductor laser in operation at at least 830 nm or 840 nm and / or at most 1.1 ym or 1060 nm.
- the emits
- Semiconductor lasers then operate in near-infrared radiation.
- the semiconductor laser is set up for multimode operation.
- a manufacturing process is also specified.
- the manufacturing method produces a semiconductor laser according to one or more of the above-mentioned embodiments.
- Features of the manufacturing process are therefore also disclosed for the semiconductor laser and vice versa.
- the method comprises the following steps, preferably in the order given:
- Edge areas are formed and so that the non-oxidized, immediately adjoining areas of the current shield layer form the electrically conductive central area
- the oxidation of the current aperture layer is carried out wet-chemically.
- the oxidation of the current aperture layer is carried out at a temperature of at least
- this temperature is at most 600 ° C or 500 ° C or 450 ° C.
- Figure 1 is a schematic sectional view of a
- Figure 2 is a schematic sectional view of a semiconductor laser
- Figure 3 is a schematic plan view of a
- Figure 4 is a schematic sectional view of a
- Figure 5 is a schematic sectional view of a
- Figure 6 is a schematic sectional view of a
- Figure 7 is a schematic plan view of a
- Figure is a schematic sectional view of a
- FIGS. 1 to 4 A production method for a semiconductor laser 1 is illustrated in FIGS. 1 to 4.
- a semiconductor layer sequence 2 is grown on a substrate 6.
- the substrate 6 is, for example, an n-doped GaAs substrate.
- An growth layer 27 is optionally located directly on the substrate 6.
- the growth direction G the growth direction
- Waveguide layer 22, an active zone 21, a further waveguide layer 22 and a further cladding layer 23 can be made of AlGaAs and are, for example, n-doped on the substrate side and p-doped on a side facing away from the active zone 21.
- the semiconductor layer sequence 2 can have a buffer layer 25
- the buffer layer 25 is made, for example, of n-doped GaAs.
- the semiconductor layer sequence can have a contact layer 24 on a side facing away from the substrate 6.
- the contact layer 24 can form an upper side 20 of the semiconductor layer sequence.
- the contact layer 24 is made of p-doped GaAs, and a relatively high dopant concentration can be present.
- the semiconductor layer sequence 2 comprises one
- the current aperture layer 3 is preferably located between the p-side waveguide layer 22 and the associated cladding layer 23 and directly adjoins these layers. Like all other layers of the
- the current aperture layer 3 is preferably grown as a homogeneous, continuous and unstructured layer over a complete wafer.
- the current diaphragm layer 3 is made of p-doped AlGaAs with a Ga content of 2%. That is, the
- Current aperture layer 3 is almost made of AlAs.
- a thickness of the current diaphragm layer 3 is preferably only small and is in particular around 30 nm.
- a distance between the Current aperture layer 3 and the active zone 21, on the other hand, is relatively large and is, for example, approximately 1 ⁇ m.
- the method step in FIG. 2 illustrates that through the semiconductor layer sequence 2 into the
- trenches 5 are formed.
- the trenches 5 can be of V-shaped design in cross section. Through the trenches 5 the grown according to Figure 1
- a width of the trenches 5 on the upper side 20 is, for example, at least 2 ⁇ m or 5 ⁇ m and / or at most 20 ⁇ m or 10 ⁇ m, in particular between
- the current aperture layer 3 is oxidized laterally from the trenches 5.
- This oxidation is preferably carried out wet-chemically at a temperature of, for example, approximately 400 ° C.
- edge regions 33 are formed which extend away from the trenches 5 in the direction towards a non-oxidized central region 32. The remains in the central area 32
- Edge regions 33 which are oxidized, is
- Current aperture layer 3 electrically insulating or at least significantly reduced in its electrical conductivity.
- a transition between the edge regions 33 and the central region 32 in the lateral direction is preferably formed abruptly.
- Figure 3 is a plan view of the wafer according to the
- trenches 5 preferably extend continuously along later resonator axes of the individual semiconductor lasers 1 Trenches 5 can thus be on the wafer through straight, continuous structures over several of the later ones
- Semiconductor laser 1 may be formed. Between adjacent areas of the semiconductor layer sequence 2 for the
- Semiconductor lasers 1 are therefore preferably located in each case two of the trenches 5.
- the trenches 5 in the finished semiconductor lasers 1 are set up to suppress parasitic modes such as ring modes.
- the trenches 5 preferably point obliquely
- Growth direction G extending side surfaces in order to reflect radiation not intended for amplification away from the plane of the active zone 21.
- FIG. 4 shows the finished semiconductor laser 1, after which electrical contact surfaces 4 have been applied and after which a separation into the semiconductor lasers 1 has been carried out
- a resonator axis is oriented perpendicular to the plane of the drawing in FIG. 4.
- Semiconductor layer sequence 2 is applied comparatively broadly across the semiconductor layer sequence 2. Structural edges in the area of the energized central area 32 are thus avoided. Thus, no or no significant stresses in the semiconductor layer sequence 2 occur at the central region 32, which would be caused by structural edges. Thus, a high quality of the optical modes of the emitted
- Laser radiation can be achieved.
- a width W of the central region 32 is preferably at least 100 ⁇ m and is therefore comparatively wide.
- a unstructured minimum width M, which adjoins the central region 32 on both sides, is preferably between 5 ⁇ m and 10 ⁇ m inclusive. The minimum width M is thus so large that there is an optical decoupling away from the central region 32 over the minimum width M. In other words, the minimum width M is chosen so large that
- the edge areas 33 are wider than that
- Semiconductor layer sequence 2 protrudes beyond the contact area 4 on the upper side 20.
- the contact surface 4 on the substrate 6 is preferably applied over the entire surface or almost over the entire surface.
- the contact surfaces 4 are each by one
- FIG. 5 illustrates that a passivation 8 is additionally installed in the trenches 5.
- the passivation 8 can partially cover the semiconductor layer sequence 2 on the upper side 20.
- the contact surface 4 on the top 20 partially extends to the passivation 8. This creates an edge 9 between the corresponding contact surface 4 and passivation 8. However, this edge 9 is spaced at least a minimum width M from the central region 32, in the direction perpendicular to the growth direction G and in the direction perpendicular to a resonator axis R, which is perpendicular to the
- the contact surface 4 In a departure from the illustration in FIG. 5, it is possible for the contact surface 4 to be flush with the passivation 8 on the upper side 20 in the lateral direction, or for this contact surface 4 to end at a distance from the passivation 8.
- the semiconductor layer sequence 2 and the contact surface 4 are flush with one another on the upper side 20.
- the same can also apply in the exemplary embodiments in FIGS. 4 and 5.
- the passivation 8 can optionally also be present.
- a further current diaphragm layer 3 can optionally be present. That is, the active zone 21 can be between the two
- the trenches 5, viewed in cross section, can be designed to widen in a trapezoidal manner toward the substrate 6. Furthermore, it is possible that the trenches 5 do not extend into the substrate 6.
- an etching stop layer 28 in the Semiconductor layer sequence 2 may be present, for example directly on the substrate 6.
- FIG. 7 shows a top view of the semiconductor laser 1. It can be seen that the trenches 5 extend on both sides of a resonator axis R. The edge regions 33 start from the trenches 5 and extend with one
- Resonator axis R is delimited by facets 7.
- a laser radiation L generated during operation emerges from the semiconductor layer sequence 2 on one of the facets 7.
- the contact surface 4 can end at a distance from the facets 7 on the upper side 20 in order to prevent or reduce current supply directly at the facets 7.
- FIG. 10 A modification 10 of a semiconductor laser is shown in FIG. In this modification 10 there is none
- a lateral current limitation takes place via the geometry of the passivation layer 8 and / or the contact layer 4.
- edges 9 generate stresses in the semiconductor layer sequence 2 directly on the energized area. This can result in a change in the polarization of the laser radiation at the edges of the energized zone. This is undesirable in many applications.
- the central region 32 and the edge regions 33 are also induced in the semiconductor layer sequence 2, but due to the small thickness, these stresses have only a slight, negligible influence.
- the current diaphragm layer 3 is so thin that there is effectively no indexing of the laser mode due to the
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Abstract
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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DE112019004669.1T DE112019004669A5 (de) | 2018-09-19 | 2019-09-12 | Gewinngeführter halbleiterlaser und herstellungsverfahren hierfür |
JP2021515084A JP7297875B2 (ja) | 2018-09-19 | 2019-09-12 | 利得導波型半導体レーザおよびその製造方法 |
US17/277,023 US11984704B2 (en) | 2018-09-19 | 2019-09-12 | Gain-guided semiconductor laser and method of manufacturing the same |
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DE102018123019.2 | 2018-09-19 | ||
DE102018123019.2A DE102018123019A1 (de) | 2018-09-19 | 2018-09-19 | Gewinngeführter halbleiterlaser und herstellungsverfahren hierfür |
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US (1) | US11984704B2 (de) |
JP (1) | JP7297875B2 (de) |
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DE102021108785A1 (de) | 2021-04-08 | 2022-10-13 | OSRAM Opto Semiconductors Gesellschaft mit beschränkter Haftung | Verfahren zur herstellung eines halbleiterbauelements und halbleiterbauelement |
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US11984704B2 (en) | 2024-05-14 |
JP7297875B2 (ja) | 2023-06-26 |
US20220029388A1 (en) | 2022-01-27 |
DE102018123019A1 (de) | 2020-03-19 |
DE112019004669A5 (de) | 2021-06-02 |
JP2022501815A (ja) | 2022-01-06 |
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