WO2011074262A1 - レーザモジュール - Google Patents
レーザモジュール Download PDFInfo
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- WO2011074262A1 WO2011074262A1 PCT/JP2010/007301 JP2010007301W WO2011074262A1 WO 2011074262 A1 WO2011074262 A1 WO 2011074262A1 JP 2010007301 W JP2010007301 W JP 2010007301W WO 2011074262 A1 WO2011074262 A1 WO 2011074262A1
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- submount substrate
- array
- heat sink
- semiconductor laser
- expansion coefficient
- Prior art date
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- 239000000758 substrate Substances 0.000 claims abstract description 122
- 239000004065 semiconductor Substances 0.000 claims abstract description 31
- 239000011810 insulating material Substances 0.000 claims abstract description 9
- 238000007747 plating Methods 0.000 claims description 73
- 239000000463 material Substances 0.000 claims description 28
- 229910001218 Gallium arsenide Inorganic materials 0.000 claims description 8
- 229910000679 solder Inorganic materials 0.000 description 18
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- 239000002131 composite material Substances 0.000 description 1
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- 229910052802 copper Inorganic materials 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/024—Arrangements for thermal management
- H01S5/02476—Heat spreaders, i.e. improving heat flow between laser chip and heat dissipating elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/022—Mountings; Housings
- H01S5/0233—Mounting configuration of laser chips
- H01S5/02345—Wire-bonding
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/26—Bombardment with radiation
- H01L21/263—Bombardment with radiation with high-energy radiation
- H01L21/265—Bombardment with radiation with high-energy radiation producing ion implantation
- H01L2021/26573—Bombardment with radiation with high-energy radiation producing ion implantation in diamond
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/4805—Shape
- H01L2224/4809—Loop shape
- H01L2224/48091—Arched
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/022—Mountings; Housings
- H01S5/0235—Method for mounting laser chips
- H01S5/02355—Fixing laser chips on mounts
- H01S5/0237—Fixing laser chips on mounts by soldering
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
- H01S5/4025—Array arrangements, e.g. constituted by discrete laser diodes or laser bar
- H01S5/4031—Edge-emitting structures
Definitions
- the present invention relates to a laser module using a semiconductor laser array element.
- LDs Laser Diodes
- an LD array a semiconductor laser array element in which a plurality of light emitting spots (emitters) are arranged in parallel on the same chip.
- the element size increases in proportion to the number of emitters arranged in parallel, and the total heat generation amount increases.
- the element size is increased, stress increases due to mismatch of the linear expansion coefficient with the mating member during mounting and driving, and the output is reduced when defects are generated and grow in the element and reach the active layer (DLD) : Dark Line Defect) may occur, or the element may break due to the development of cracks or the like.
- the element temperature is high, the progress of the defect is accelerated, and as a result, the element lifetime is reduced. From the above, there is a demand for a module structure that can drive the LD array at low stress and at an appropriate temperature.
- CuW is expensive compared to other common conductor materials such as Cu, and there is a problem in that, when a component composed of CuW is used, the manufacturing cost increases.
- an object of the present invention is to provide an inexpensive laser module that reduces the stress acting on the LD array without using an expensive material such as CuW.
- a laser module includes a heat sink that dissipates heat from a contact member, a submount substrate that is disposed on the heat sink and made of an insulating material, and a power feeding layer that is disposed on the submount substrate.
- a semiconductor laser array having a plurality of light emitting portions arranged in parallel on the power feeding layer, and the linear expansion coefficient of the semiconductor laser array is larger than the linear expansion coefficient of the submount substrate, and the power feeding layer and The linear expansion coefficient of the submount substrate is smaller than the linear expansion coefficient of the heat sink and connected to the heat sink, and is configured to be within a predetermined range including the linear expansion coefficient of the semiconductor laser array. It will be.
- the laser module according to the present invention includes a heat sink that dissipates heat from a contact member, a submount substrate that is disposed on the heat sink and is made of an insulating material, and a power supply that is disposed on the submount substrate. And a semiconductor laser array having a plurality of light emitting portions arranged in parallel on the power feeding layer, and the linear expansion coefficient of the semiconductor laser array is larger than the linear expansion coefficient of the submount substrate, and the power feeding Smaller than the linear expansion coefficient of the layer and the heat sink, the bonding width between the heat sink and the submount substrate, with the width of the semiconductor laser array as the lower limit, and the relationship between the stress acting on the semiconductor laser array and the connection width
- the range that can be linearly approximated is the upper limit.
- a laser module includes a heat sink that dissipates heat from a contact member, a submount substrate that is disposed on the heat sink and made of an insulating material, and a power supply that is disposed on the submount substrate.
- a semiconductor laser array having a plurality of light emitting portions arranged in parallel on the power feeding layer, the material of the submount substrate is AIN or SiC, the material of the heat sink is Cu, and the semiconductor The material of the laser array is GaAs, the material of the power feeding layer is Cu, and the width dimension of the semiconductor laser array is B, the bonding width dimension A of the submount substrate with the heat sink is B ⁇ A ⁇ B + 4 mm. It is.
- the stress applied to the LD array can be reduced, and an inexpensive laser module can be obtained.
- FIG. 5 is a graph showing the relationship between the bonding width A between the submount substrate and the heat sink of the laser module in Embodiment 1 of the present invention and the stress acting in the LD array width direction for each thickness of the submount substrate. It is a figure which shows the circuit structure of LD array and the plating layer in Embodiment 1 of this invention. It is a graph which shows the relationship between the emitter arrangement
- FIG. 1 is a perspective view of a laser module 100 according to the present embodiment
- FIG. 2 is a front view of the laser module 100 according to the present embodiment
- FIG. 3 is a side view of the laser module 100 according to the present embodiment. The side from which laser light is emitted from the laser module 100 is the front.
- the laser module 100 includes a stem 1, a lead pin 2, a heat sink 3, a submount substrate 4 having plating layers 5A, 5B, and 5C, an LD array 6, a wire wiring 7, and a ribbon wiring 8.
- the stem 1 is a plate-like member made of a metal material such as Fe, and four openings through which the lead pins 2A to 2D pass are formed.
- the lead pins 2A to 2D are made of a conductive material, and are power supply lines that supply power to the LD array 6 from a power source (not shown). Sealing portions 9A to 9D made of an insulating material such as glass are formed between the lead pins 2A to 2D and the stem 1, and the lead pins 2A to 2D and the stem 1 are electrically connected by the sealing portions 9A to 9D. Is insulated. In this way, the lead pins 2A to 2D are insulated and fixed by glass sealing while penetrating the stem 1.
- the heat sink 3 is made of a metal material having high thermal conductivity such as Cu or Fe, and is a heat radiating member that emits heat from a contact member.
- the heat sink 3 is joined to the stem 1 with solder or silver solder. Alternatively, it is formed as an integral structure with the stem 1 by a method such as cold forging.
- the submount substrate 4 is an insulating substrate interposed between the heat sink 3 and the LD array 6 and made of a high thermal conductive insulating material such as AlN or SiC.
- a high thermal conductive insulating material such as AlN or SiC.
- plating layers 5A, 5B, and 5C made of a metal material having high conductivity such as Cu, high thermal conductivity, and low rigidity are formed.
- the submount substrate 4 is mounted and fixed to the heat sink 3 via a plating layer 5C by soldering or the like.
- AuSn solder can be used as a bonding material.
- the LD array 6 is a semiconductor element composed of a plurality of emitters (light emitting portions) arranged and wired in parallel.
- the LD array 6 has electrodes on the lower surface and the upper surface on the submount substrate 4 side, and emits laser light from the front surface portion 6a when a current is applied between the two electrodes.
- the lower surface of the LD array 6 is joined to the plating layer 5A of the submount substrate 4 by soldering or the like, whereby the electrodes on the lower surface of the LD array 6 and the plating layer 5A are electrically connected.
- AuSn solder can be used as a joining material.
- the electrode on the upper surface of the LD array 6 is electrically connected to the plating layer 5B of the submount substrate 4 by wire wiring 7 made of a plurality of fine metal wires.
- Both ends of the upper surface of the plating layer 5A, which is a power feeding layer for supplying power to the LD array 6, are electrically joined to the lead pins 2A and 2D by ribbon wirings 8A and 8D.
- Both ends of the upper surface of the plating layer 5B, which is a power supply layer for supplying power to the LD array 6, are electrically joined to the lead pins 2B and 2C by ribbon wirings 8B and 8C.
- the LD array 6 is mounted in a state where the anode (anode) is positioned on the lower surface, that is, junction-down. Therefore, when the lead pins 2A to 2D are connected to a power source (not shown), the lead pins 2A and 2D ⁇ ribbon wiring 8A and 8D ⁇ plating layer 5A ⁇ LD array 6 ⁇ wire wiring 7 ⁇ plating layer 5B ⁇ ribbon wiring 8B and 8C ⁇ lead pin Current flows through the power supply paths 2B and 2C. By passing a current through the LD array 6, a current flows through each emitter arranged and wired in parallel inside the LD array 6, so that each emitter oscillates and emits light, whereby laser light is emitted from the front part 6 a.
- the bonding between the LD array 6 and the plating layer 5A and the bonding between the heat sink 3 and the plating layer 5C are performed by soldering using AuSn solder previously disposed on the plating layer 5A and by evaporation on the plating layer 5C.
- the submount substrate 4 is disposed on the heat sink 3 so that the plating layer 5C is in contact with the heat sink 3, and the LD array 6 is disposed on the plating layer 5A.
- the AuSn solder is melted by heating to 300 to 400 ° C., and cooled to solidify the AuSn solder.
- the heat sink 3 and the plating layer 5C and the LD array 6 and the plating layer 5A are joined, and the heat sink 3 and the submount substrate 4 and the submount substrate 4 and the LD array 6 are joined.
- the parts to be joined are at substantially the same temperature.
- the linear expansion coefficient ⁇ of GaAs is 6.6 ⁇ 10 6. ⁇ 6 [mm / (mm ⁇ K)]
- the linear expansion coefficient ⁇ of the submount substrate 4 is 4.8 ⁇ 10 ⁇ 6 [mm / (mm ⁇ K)] 3.7 ⁇ in the case of AlN.
- the LD array 6, the submount substrate 4, the plated layer 5C, and the heat sink 3 undergo thermal expansion corresponding to the linear expansion coefficient of each material as the temperature rises. Also, in the cooling process for solidifying the AuSn solder, the LD array 6, the submount substrate 4, the plating layer 5C, and the heat sink 3 undergo thermal contraction according to the linear expansion coefficient of each material as the temperature decreases. Arise.
- the LD array 6 and the submount substrate 4 are joined by solidification of the solder when it reaches a melting point of 280 ° C.
- a stress corresponding to the difference in thermal shrinkage between the submount substrate 3 and the LD array 6 acts on the LD array 6.
- the stress applied to the LD array 6 increases, the aforementioned DLD occurs or cracks occur. As a result of the progress, the driving life of the LD array 6 is reduced.
- FIG. 4 is a schematic diagram showing expansion and contraction due to temperature changes of the heat sink 3, the submount substrate 4, the plating layers 5A and 5C, and the LD array 6 in the heating and cooling processes.
- the shapes of the heat sink 3a, the submount substrate 4a, the plating layers 5Aa, 5Ca, and the LD array 6a during heating are indicated by broken lines, and the heat sink 3b, the submount substrate 4b, the plating layers 5Ab, 5Cb, and The shape of the LD array 6b is shown by a solid line.
- the bonding width dimension between the submount substrate 4 and the heat sink 3 is A
- the bonding width dimension between the submount substrate 4 and the LD array 6 is B.
- each layer expands or contracts due to a change in temperature, but since both the heat sink 3 and the plating layer 5C are made of Cu, there is no difference in the amount of contraction. Therefore, regarding the stress between the submount substrate 4 and the plating layer 5C, the contraction of the plating layer 5C can be considered as the contraction of the heat sink 3.
- the contraction of the plating layer 5A for example, if the thickness of the submount substrate 4 is about 300 ⁇ m and the thickness of the plating layer 5A is about 100 ⁇ m or less, the Young's modulus of SiC is 440 GPa (AlN is 320 GPa).
- the Young's modulus of Cu is 130 GPa which is 1/3 or less, and since the rigidity of Cu is small with respect to SiC, the influence of the plating layer 5A on the stress acting on the LD array 6 is reduced. With respect to the stress between the submount substrate 4, the plating layer 5 ⁇ / b> A can be ignored.
- the temperature of the AuSn solder dropped to the melting point, and when the AuSn solder solidified, thermal expansion occurred in each part, but the solder was in a molten state just before it. I do not receive it.
- the heat sink 3 made of Cu tends to shrink by the length of ⁇ A ⁇ T at the joint between the heat sink 3 and the submount substrate 4, whereas AlN Alternatively, the submount substrate 4 made of SiC tends to contract by ⁇ A ⁇ T.
- the heat sink 3 and the submount substrate 4 are bonded and restrained, ⁇ > ⁇ and the thickness of the heat sink 3 is sufficiently larger than the thickness of the submount substrate 4.
- the submount substrate 4 is contracted and deformed more greatly than the case where the submount substrate 4 alone contracts due to the stress in the direction of shortening the width from the heat sink 3 at the joint surface with the heat sink 3.
- the thickness of the LD array 6 is generally about 100 ⁇ m, and the Young's modulus of GaAs as the main material is about 83 GPa, which is smaller than the Young's modulus of the submount substrate 4.
- the submount substrate 4 is not significantly affected by the thermal shrinkage from the LD array 6. For this reason, the submount substrate 4 undergoes the maximum shrinkage deformation due to the heat shrinkage of the heat sink 3 on the joint surface with the heat sink 3, but the joint surface with the LD array 6 is not significantly affected by the heat shrinkage. Therefore, the influence of the heat shrinkage of the heat sink 3 is alleviated as it approaches the joint surface with the LD array 6, and the shrinkage amount is minimized at the joint surface with the LD array 6.
- the amount of contraction at the joint surface of the submount substrate 4 with the LD array 6 is ⁇ X
- the amount of contraction ⁇ X is smaller than the amount of contraction of the heat sink 3 alone and larger than the amount of contraction of the submount substrate 4 alone, so ⁇ B ⁇ T ⁇ X ⁇ B ⁇ T Satisfy the relationship.
- the contraction amount ⁇ B ⁇ T of the LD array 6 alone also satisfies ⁇ ⁇ ⁇ , the relationship ⁇ B ⁇ T ⁇ B ⁇ T ⁇ B ⁇ T is satisfied.
- FIGS. 5 and 6 are calculation results on the relationship between the bonding width dimension A of the submount substrate 4 of the laser module and the average value of the stress applied to the LD array 6 (LD load stress) in the first embodiment of the present invention. It is the graph which showed.
- FIG. 5 shows the case where the thickness of the submount substrate 4 is 300 ⁇ m and the width of the LD array 6 is 2, 4, 6 mm.
- the data when the width of the LD array 6 is 2 mm is indicated by a triangle
- the data when the width of the LD array 6 is 4 mm is indicated by a rhombus
- the data when the width of the LD array 6 is 6 mm. Is shown by a square.
- FIG. 5 shows the case where the thickness of the submount substrate 4 is 300 ⁇ m and the width of the LD array 6 is 2, 4, 6 mm.
- the data when the width of the LD array 6 is 2 mm is indicated by a triangle
- FIG. 6 shows the case where the width of the LD array 6 is 4 mm and the thickness of the submount substrate 4 is 200, 300, and 400 ⁇ m.
- data when the thickness of the submount substrate 4 is 200 ⁇ m is indicated by a triangle
- data when the thickness of the submount substrate 4 is 300 ⁇ m is indicated by a rhombus
- the thickness of the submount substrate 4 is Data in the case of 400 ⁇ m are indicated by squares.
- the value of the LD load stress is normalized to 1 when the width of the LD array 6 is 4 mm, the thickness of the submount substrate 4 is 300 ⁇ m, and the width of the submount substrate 4 is 4 mm.
- the shrinkage amount of the LD array 6 and the shrinkage amount of the submount substrate 4 are both zero at the central portion in the width direction and have a distribution that becomes maximum at the end portions in the width direction.
- the stress applied to the LD array 6 depends on the difference between the shrinkage amount of the submount substrate 4 and the shrinkage amount of the LD array 6, the stress is 0 at the center in the width direction of the LD array 6. It has the maximum distribution at the direction end. Therefore, if the contraction amount of the LD array 6 and the contraction amount of the submount substrate 4 can be made close to each other at the width direction end portion of the LD array 6 where the stress applied to the LD array 6 is maximized, the load on the LD array 6 is reduced. Stress can be reduced, and the reliability of the LD array 6 can be ensured.
- the bonding width of the submount substrate 4 is larger than the width dimension B of the LD array 6.
- the value AB of the amount of protrusion of A from the LD array 6 becomes dominant. Therefore, the dimension A of the submount substrate may be determined from the width dimension B of the LD array 6 so that the value AB is equal to or less than a predetermined value. Further, the wavelength of the laser beam output from the LD array 6 varies depending on the stress applied to the LD array 6.
- the bonding width A of the submount substrate 4 is determined in a range in which the stress applied to the LD array 6 varies linearly with the bonding width A of the submount substrate 4, the stress applied to the LD array 6 is reduced.
- the bonding width A of the submount substrate 4 is in the range of B ⁇ A ⁇ B + 4 mm, that is, the width dimension of the LD array is the lower limit, and the stress applied to the LD array 6 is linear depending on the bonding width A of the submount substrate 4.
- the range that can be approximated may be selected as the upper limit.
- the linear expansion coefficient ⁇ of the submount substrate 4 is smaller than the linear expansion coefficient ⁇ of the LD array 6. Therefore, when the heat sink 3 is not considered in the cooling process, the shrinkage amount of the submount substrate 4 becomes smaller than the shrinkage amount of the LD array 6, and the LD array 6 has a width and length at the joint surface with the submount substrate 4. It will be subjected to stress that will make it longer.
- the submount substrate 4 is disposed on the heat sink 3 having a larger linear expansion coefficient than the submount substrate 4, and the submount substrate 4 is compressed from the heat sink 3 during the cooling process. receive.
- the linear expansion coefficient of each component and the bonding width between the submount substrate 4 and the heat sink 3 may be adjusted so that the difference between the two ranges is within a predetermined range.
- the “linear expansion coefficient of only the submount substrate 4”, which is the linear expansion coefficient of the submount substrate 4 in a state where it is bonded to the heat sink 3, is set to be approximately the same as the linear expansion coefficient of the LD array 6, that is, By setting the “only linear expansion coefficient of the mount substrate 4” to be within a predetermined range including the linear expansion coefficient of the LD array 6, the stress generated in the LD array 6 can be reduced.
- “the linear expansion coefficient of only the submount substrate 4”, which is the linear expansion coefficient of the submount substrate 4 in a state of being connected to the heat sink 3, is applied to the submount substrate 4 in a state of being bonded to the heat sink 3. The amount of deformation can be obtained by obtaining the structure analysis.
- FIG. 7 is a diagram showing a circuit configuration of the LD array 6 and the plating layers 5A and 5B
- FIG. 8 is a graph showing the relationship between the emitter arrangement of the LD array 6 and the applied current in the laser module according to Embodiment 1 of the present invention. It is.
- the difference E between the maximum and minimum emitter currents shown in FIG. 8 is hereinafter referred to as current variation.
- the laser light source module 100 When a current flows through the laser light source module 100, power is supplied to each emitter 21 from both side surfaces of the LD array 6 via the ribbon wiring 8. Since the ribbon wirings 8A and 8D are connected to both ends of the plating layer 5A, the emitters of the LD array 6 are arranged in parallel at regular intervals between the connection parts of the ribbon wirings 8A and 8D. As shown in FIG. 3, a conductor resistance 22 exists between the emitters 21.
- FIG. 9 shows the correlation between the variation in current and the thickness of the plated layers 5A and 5B and the thickness of the plated layer 5A when the LD array of the laser module in Embodiment 1 of the present invention has 15 emitters arranged at a pitch of 200 ⁇ m. It is a graph which shows the correlation of a conductor thickness dimension and the surface roughness of 5 A of plating layers. The value of the current variation in FIG. 9 is normalized with 1 when the thickness of the plating layers 5A and 5B is 100 ⁇ m. From FIG.
- the current variation since the current variation rapidly increases when the thickness of the plating layers 5A and 5B is 30 ⁇ m or less, the current variation can be suppressed to a low level by setting the thickness of the plating layers 5A and 5B to 30 ⁇ m or more. Recognize. This corresponds to an increase in the thickness of the plating layers 5A and 5B, which corresponds to an increase in the thickness of the plating layers 5A and 5B. This is because the conductor resistance 22 between the emitters 21 is reduced, so that the current variation, which is the difference between the current flowing through the emitter 21 arranged outside and the current flowing through the emitter 21 arranged inside, is reduced.
- the thickness C of the plating layers 5A and 5B on the submount substrate 4 is preferably set to satisfy 30 [ ⁇ m] ⁇ C ⁇ 100 [ ⁇ m]. Further, as shown in FIG. 9, since the current variation can be suppressed to a practical level by setting the thickness of the plating layers 5A and 5B to 10 ⁇ m or more, at least the thickness C of the plating layers 5A and 5B is 10 ⁇ m. ] ⁇ C ⁇ 100 [ ⁇ m] may be set. As described above, by maintaining the thickness of the plating layers 5A and 5B at a thickness that is less than the thickness at which current variation is unlikely to occur, the conductor resistance 22 between the emitters can be reduced, and a uniform light output can be obtained. it can.
- the surface roughness Ry (the difference between the thinnest part and the thickest part) of the plating layer 5A is about 1 ⁇ m when the thickness of the plating layer 5A is 20 ⁇ m, and the thickness of the plating layer 5A is 75 ⁇ m. In some cases, it is about 3 ⁇ m.
- the reliability deteriorates due to the generation of defects, and the polarization characteristics due to the fluctuation of the optical characteristics due to the stress. It is known that laser performance is degraded.
- the surface roughness of the plating layer 5A is preferably about 2 ⁇ m or less. . From FIG.
- the thickness C of the plating layer 5A on which the LD array 6 is mounted 10 ⁇ m or more and 50 ⁇ m or less
- the surface roughness Ry of the plating layer 5A can be suppressed to 2 ⁇ m or less
- polarization characteristics and reliability A laser module in which the current variation of the LD array 6 is reduced can be configured without impairing the above.
- the above is not the case when the surface roughness is reduced by processing such as polishing after plating.
- the Young's modulus of CuW is 255 GPa, whereas the Young's modulus of Cu is about 130 GPa, which is about 1 ⁇ 2, so that the thermal expansion and Even when a load is generated in the LD array 6 due to a load at the time of bonding, the plating layer 5A functions as an interference layer, and stress can be reduced.
- the laser module according to the first embodiment of the present invention adjusts the bonding width dimension A between the heat sink 3 and the submount substrate 4 to adjust the heat sink 3, the submount substrate 4, and the plating layers 5A and 5C.
- the difference between the thermal expansion amount of the joint surface of the LD array 6 and the thermal expansion amount of the LD array 6 in the composite material is within a predetermined range, that is, the submount substrate 4 connected to the heat sink 3
- the assumed linear expansion coefficient is set within a predetermined range including the linear expansion coefficient of the LD array 6, the stress applied to the LD array 6 is reduced when the LD array 6 is soldered and when the LD array 6 is driven.
- an inexpensive laser module with good thermal conductivity can be obtained.
- plating layers 5A and 5B having a thickness of 30 ⁇ m or more on the submount substrate 4 and using them as power supply conductors the voltage drop between the emitters 21 of the LD array 6 in the power supply conductors can be reduced even when a large current is supplied. it can. As a result, the amount of current flowing through each emitter 21 of the LD array 6 becomes uniform, the current concentrates on a part of the emitters 21, and the long-term life characteristics are improved without causing excessive light emission and temperature rise.
- the volume resistivity of CuW used as the material of the submount substrate 4 is 5.4 [ ⁇ ⁇ cm], whereas the volume low efficiency of the feeding layer is about 1/3 that of CuW. Since Cu which is 0.7 [ ⁇ ⁇ cm] is used, the variation in the applied current between the emitters 21 due to the conductor resistance can be suppressed to about 3 in the same structure. Thereby, compared with the case where CuW is used as the material of the submount substrate 4 as a conventional stress relaxation structure and a power supply conductor, current concentration on the outer emitter 21 can be suppressed and the life can be improved.
- the thermal resistance value is greatly related to the temperature of the LD array 6.
- CuW having a thermal conductivity of about 170 [Wm ⁇ K]
- Cu having a thermal conductivity of about 398 [Wm ⁇ K] which is approximately 2.3 times, is used. Therefore, compared to the case of CuW, the thermal resistance of the conductor portion is less than half, and the temperature of the LD array 6 can be lowered to an appropriate temperature range. Therefore, the lifetime of the LD array 6 can be improved.
- the power feeding layer is integrally formed on the submount substrate 4 by plating, the number of components can be reduced as compared with the case where the CuW substrate is mounted on the submount substrate 4. , Parts assembly costs can be reduced.
- the power feeding layer may be configured not to be plated but to solder the plate member with AuSn solder or the like. In this case, since the surface roughness of the plate member on the mounting surface of the LD array 6 does not depend on the thickness of the plate member, it is necessary to consider the reduction in laser characteristics and reliability caused by increasing the thickness of the plate member. Absent.
- the plating layers 5A and 5B are formed on the upper surface of the submount substrate 4 and the plating layer 5C is formed on the lower surface.
- the lower plating layer 5C is not necessarily formed. Absent.
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Abstract
Description
また、本発明に関わるレーザモジュールは、接触する部材からの熱を放熱するヒートシンクと、前記ヒートシンク上に配置され、絶縁材料で構成されたサブマウント基板と、前記サブマウント基板上に配置される給電層と、前記給電層の上に並列配置される複数の発光部を有する半導体レーザアレイとを備え、前記半導体レーザアレイの線膨張係数は、前記サブマウント基板の線膨張係数よりも大きく、前記給電層及び前記ヒートシンクの線膨張係数よりも小さく、前記ヒートシンクと前記サブマウント基板との接合幅を、前記半導体レーザアレイの幅を下限とし、前記半導体レーザアレイに働く応力と前記接続幅との関係が線形近似できる範囲を上限となるよう構成されているものである。
さらに、本発明に関わるレーザモジュールは、接触する部材からの熱を放熱するヒートシンクと、前記ヒートシンク上に配置され、絶縁材料で構成されたサブマウント基板と、前記サブマウント基板上に配置される給電層と、前記給電層の上に並列配置される複数の発光部を有する半導体レーザアレイとを備え、前記サブマウント基板の材料はAINまたはSiCであり、前記ヒートシンクの材料はCuであり、前記半導体レーザアレイの材料はGaAsであり、前記給電層の材料はCuであり、前記半導体レーザアレイの幅寸法をBとすると、前記サブマウント基板の前記ヒートシンクとの接合幅寸法AはB≦A≦B+4mmである。
以下、図1~3を用いて本実施の形態に係るレーザモジュール100の構造について説明する。図1は本実施の形態に係るレーザモジュール100の斜視図、図2は本実施の形態に係わるレーザモジュール100の正面図、図3は本実施の形態に係わるレーザモジュール100の側面図である。なお、レーザモジュール100からレーザ光が出射される側を正面とする。
ここで、LDアレイ6の収縮量およびサブマウント基板4の収縮量はともに幅方向中央部では0であり、幅方向端部で最大となる分布を持つ。LDアレイ6に負荷される応力は、サブマウント基板4の収縮量とLDアレイ6の収縮量との差に依存するため、LDアレイ6の幅方向中央部で0であり、LDアレイ6の幅方向端部で最大となる分布を持つ。そこで、LDアレイ6に負荷される応力が最大となるLDアレイ6の幅方向端部で、LDアレイ6の収縮量とサブマウント基板4の収縮量とを近い値にできれば、LDアレイ6に負荷される応力を低減することができ、LDアレイ6の信頼性を確保できる。LDアレイ6の幅方向端部において、LDアレイ6の収縮量とサブマウント基板4の収縮量とを近い値にするためには、LDアレイ6の幅寸法Bよりもサブマウント基板4の接合幅AのLDアレイ6からのはみ出し量であるA-Bの値が支配的になる。そのため、A-Bの値が所定値以下となるよう、LDアレイ6の幅寸法Bからサブマウント基板のAの寸法を決めればよい。
また、LDアレイ6に負荷される応力によってLDアレイ6から出力されるレーザ光の波長が異なる。このため、LDアレイ6に負荷される応力がサブマウント基板4の接合幅Aによって線形に変化する範囲でサブマウント基板4の接合幅Aを決定すれば、LDアレイ6に負荷される応力を低減できるとともに、レーザ光の波長を所望の波長に調整できるという効果を得られる。
従って、サブマウント基板4の接合幅Aは、B≦A≦B+4mmの範囲、すなわち、LDアレイの幅寸法を下限とし、LDアレイ6に負荷される応力がサブマウント基板4の接合幅Aによって線形近似できる範囲を上限として選定すればよい。
Claims (6)
- 接触する部材からの熱を放熱するヒートシンクと、
前記ヒートシンク上に配置され、絶縁材料で構成されたサブマウント基板と、
前記サブマウント基板上に配置される給電層と、
前記給電層の上に並列配置される複数の発光部を有する半導体レーザアレイと
を備え、
前記半導体レーザアレイの線膨張係数は、前記サブマウント基板の線膨張係数よりも大きく、前記給電層及び前記ヒートシンクの線膨張係数よりも小さく、
前記ヒートシンクと接続された状態での前記サブマウント基板の線膨張係数が、前記半導体レーザアレイの線膨張係数を含む所定の範囲内となるように構成されてなるレーザモジュール。 - 接触する部材からの熱を放熱するヒートシンクと、
前記ヒートシンク上に配置され、絶縁材料で構成されたサブマウント基板と、
前記サブマウント基板上に配置される給電層と、
前記給電層の上に並列配置される複数の発光部を有する半導体レーザアレイと
を備え、
前記半導体レーザアレイの線膨張係数は、前記サブマウント基板の線膨張係数よりも大きく、前記給電層及び前記ヒートシンクの線膨張係数よりも小さく、
前記ヒートシンクと前記サブマウント基板との接合幅を、前記半導体レーザアレイの幅を下限とし、前記半導体レーザアレイに働く応力と前記接続幅との関係が線形近似できる範囲を上限となるよう構成されているレーザモジュール。 - 接触する部材からの熱を放熱するヒートシンクと、
前記ヒートシンク上に配置され、絶縁材料で構成されたサブマウント基板と、
前記サブマウント基板上に配置される給電層と、
前記給電層の上に並列配置される複数の発光部を有する半導体レーザアレイと
を備え、
前記サブマウント基板の材料はAINまたはSiCであり、
前記ヒートシンクの材料はCuであり、
前記半導体レーザアレイの材料はGaAsであり、
前記給電層の材料はCuであり、
前記半導体レーザアレイの幅寸法をBとすると、
前記サブマウント基板の前記ヒートシンクとの接合幅寸法AはB≦A≦B+4mmであることを特徴とするレーザモジュール。 - 前記サブマウント基板の材料はAINもしくはSiCであり、
前記ヒートシンクの材料はCuであり、
前記半導体レーザアレイの材料はGaAsであり、
前記給電層の材料はCuであり、
前記給電層の厚さは10μm以上100μm以下であることを特徴とする請求項1~3のいずれか1項に記載のレーザモジュール。 - 前記サブマウント基板の材料はAINもしくはSiCであり、
前記ヒートシンクの材料はCuであり、
前記半導体レーザアレイの材料はGaAsであり、
前記給電層の材料はCuであり、
前記給電層の厚さは30μm以上100μm以下であることを特徴とする請求項1~3のいずれか1項に記載のレーザモジュール。 - 前記サブマウント基板の材料はAINもしくはSiCであり、
前記ヒートシンクの材料はCuであり、
前記半導体レーザアレイの材料はGaAsであり、
前記給電層はめっきにより形成されたCuであり、
前記給電層の厚さは10μm以上50μm以下であることを特徴とする請求項1~3のいずれか1項に記載のレーザモジュール。
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JP2015213109A (ja) * | 2014-05-01 | 2015-11-26 | 三菱電機株式会社 | レーザ光源モジュール |
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WO2017010026A1 (ja) * | 2015-07-16 | 2017-01-19 | 三菱電機株式会社 | レーザ光源モジュール |
JP2017079285A (ja) * | 2015-10-21 | 2017-04-27 | 三菱電機株式会社 | レーザ光源装置 |
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US10050411B2 (en) | 2014-10-24 | 2018-08-14 | Nichia Corporation | Submount and manufacturing method thereof and semiconductor laser device and manufacturing method thereof |
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