WO2012050132A1 - 半導体レーザ装置 - Google Patents
半導体レーザ装置 Download PDFInfo
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- WO2012050132A1 WO2012050132A1 PCT/JP2011/073433 JP2011073433W WO2012050132A1 WO 2012050132 A1 WO2012050132 A1 WO 2012050132A1 JP 2011073433 W JP2011073433 W JP 2011073433W WO 2012050132 A1 WO2012050132 A1 WO 2012050132A1
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- semiconductor laser
- heat sink
- submount
- fixed
- expansion coefficient
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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
- H01S5/02407—Active cooling, e.g. the laser temperature is controlled by a thermo-electric cooler or water cooling
- H01S5/02423—Liquid cooling, e.g. a liquid cools a mount of the laser
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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
- H01S5/022—Mountings; Housings
- H01S5/023—Mount members, e.g. sub-mount members
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
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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
- H01S5/022—Mountings; Housings
- H01S5/0233—Mounting configuration of laser chips
-
- 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
-
- 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
- H01S5/02365—Fixing laser chips on mounts by clamping
-
- 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
- H01S5/02—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
- H01S5/02492—CuW heat spreaders
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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
- H01S5/40—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
Definitions
- the present invention relates to a semiconductor laser device provided with a heat sink.
- Patent Document 1 Patent Document 1
- Patent Document 2 Patent Document 3
- Patent Document 1 discloses a semiconductor laser module in which both sides of a semiconductor laser bar are sandwiched between metal submounts.
- As the material of the submount Mo, W, Cu, Cu—W alloy, Cu—Mo alloy, SiC, or AlN can be used.
- the thickness of each submount is 50 to 200 ⁇ m.
- the semiconductor laser module is attached to a liquid-cooled heat sink. Thereby, it is possible to correct the warp of the semiconductor laser bar.
- Patent Document 2 discloses a semiconductor laser device in which a semiconductor laser bar is attached on a heat sink and a reinforcing member made of a material having a small linear expansion coefficient is attached on the same surface as the attachment surface of the semiconductor laser bar in the heat sink. ing.
- the material of the reinforcing member includes any one of Cu, Al, Ni, W, Mo, Fe, Cr, Co, and Bi.
- Patent Document 3 discloses a semiconductor laser device in which a liquid-cooled heat sink is covered with a resin layer and a semiconductor laser bar is attached. This document discloses a structure capable of improving cooling efficiency and preventing corrosion and water leakage.
- the warpage of the semiconductor laser module itself is suppressed by the submount.
- the emission point position from the semiconductor laser module was arranged on a curved line slightly displaced from the design line, and a phenomenon of deterioration of the emission characteristic that the desired emission distribution could not be obtained was observed.
- the present invention has been made in view of such problems, and an object of the present invention is to provide a semiconductor laser device capable of suppressing deterioration of light emission characteristics.
- the inventors of the present application intensively studied the cause of the characteristic deterioration of the semiconductor laser device. Since a Cu—W alloy having a small linear expansion coefficient is adopted as a pair of submounts and the semiconductor laser bar should be sandwiched using these, the emission point position should not be changed in principle.
- recent high-quality liquid-cooled heat sinks have high cooling efficiency and are downsized.
- the liquid-cooled heat sink can bend in the thickness direction when it expands and contracts. In this case, due to the difference in linear expansion coefficient between the laser module that should originally be highly rigid and the high-quality heat sink, stress is generated between them, and the heat sink is bent and deformed in the thickness direction.
- the inventors of the present application have found that the deviation of the light emitting point position is caused by such a high performance heat sink.
- a semiconductor laser device includes a semiconductor laser bar having a plurality of light emitting points arranged in a straight line, and a plate-like liquid having a thickness of 3 mm or less with a fluid passage formed therein.
- a cooling heat sink a first submount made of a material fixed to one surface of the semiconductor laser bar and having a smaller linear expansion coefficient than the heat sink, and fixed to the heat sink; and a linear expansion coefficient fixed to the other surface of the semiconductor laser bar
- the second submount made of a small material and a surface of the heat sink opposite to the mounting surface of the first submount, fixed at a position facing the first submount, and having a smaller linear expansion than the heat sink
- a molybdenum reinforcing body having a coefficient and a thickness of 0.1 to 0.5 mm.
- the liquid-cooled heat sink has high performance.
- the difference in linear expansion coefficient from the laser module semiconductor laser bar + submount
- the force to bend against the heat sink by the stress from the laser module side and the stress from the molybdenum reinforcement body side It tends to cancel out the force to bend.
- the rigidity of the whole is improved by attaching the molybdenum reinforcement to the heat sink. Therefore, according to the semiconductor laser device of the present invention, the curvature of the heat sink is suppressed, the displacement of the light emitting point position is suppressed, and the deterioration of the light emission characteristics can be suppressed.
- a molybdenum reinforcement body is a reinforcement body which has molybdenum as a main component (weight percent 80% or more), the same effect is acquired even if some impurities are mixed.
- a semiconductor laser device is a semiconductor laser device in which a plurality of semiconductor laser units are stacked.
- Each semiconductor laser unit has a plate-like shape in which a fluid passage is formed.
- a liquid-cooled heat sink including a semiconductor laser bar, a semiconductor laser module fixed on one side of the heat sink, and fixed at a position facing the semiconductor laser module on the other side of the heat sink, smaller than the heat sink
- a molybdenum reinforcement body having a linear expansion coefficient and a thickness of 0.1 to 0.5 mm, and one surface of the molybdenum reinforcement body in one semiconductor laser unit is fixed to the heat sink of its own semiconductor laser unit.
- the other surface is the semiconductor laser module of another semiconductor laser unit. Characterized in that it is fixed to Yuru.
- the liquid-cooled heat sink has high performance.
- the thickness is small, the difference in linear expansion coefficient from the laser module (semiconductor laser bar + submount) There is a tendency to bend.
- the overall rigidity is remarkably improved by laminating the laser modules and fixing a molybdenum reinforcement having a small linear expansion coefficient on the opposite side of the laser modules.
- the adhesive layer is disposed between the elements, and heat is simultaneously applied to fix them.
- the overall rigidity is remarkably improved. Therefore, according to the semiconductor laser device of the present invention, the curvature of the heat sink is suppressed, the displacement of the light emitting point position is suppressed, and the deterioration of the light emission characteristics can be suppressed.
- a molybdenum reinforcement body is a reinforcement body which has molybdenum as a main component (weight percent 80% or more), the same effect is acquired even if some impurities are mixed.
- a semiconductor laser device is a semiconductor laser device in which a plurality of semiconductor laser units are stacked.
- Each semiconductor laser unit has a plate-like shape in which a fluid passage is formed.
- a liquid-cooled heat sink including a semiconductor laser bar, a semiconductor laser module fixed on one side of the heat sink, and fixed at a position facing the semiconductor laser module on the other side of the heat sink, smaller than the heat sink
- a molybdenum reinforcement body having a linear expansion coefficient and a thickness of 0.1 to 0.5 mm, and one surface of the molybdenum reinforcement body in one semiconductor laser unit is fixed to the heat sink of its own semiconductor laser unit.
- the other surface is the semiconductor laser module of another semiconductor laser unit. Characterized in that it is fixed to Yuru.
- the liquid-cooled heat sink has high performance.
- the thickness is small, the difference in linear expansion coefficient from the laser module (semiconductor laser bar + submount) There is a tendency to bend.
- the overall rigidity is remarkably improved by laminating the laser modules and fixing a molybdenum reinforcement having a small linear expansion coefficient on the opposite side of the laser modules.
- the adhesive layer is disposed between the elements, and heat is simultaneously applied to fix them.
- the overall rigidity is remarkably improved. Therefore, according to the semiconductor laser device of the present invention, the curvature of the heat sink is suppressed, the displacement of the light emitting point position is suppressed, and the deterioration of the light emission characteristics can be suppressed.
- the semiconductor laser device of the present invention it is possible to suppress the deterioration of the light emission characteristics.
- FIG. 1 is a perspective view of a semiconductor laser device.
- FIG. 2 is a side view of the semiconductor laser device as viewed from the direction of arrow II.
- FIG. 3 is a front view of the semiconductor laser device as viewed from the direction of arrow III.
- FIG. 4 is an exploded perspective view of the semiconductor laser device.
- FIG. 5 is a perspective view of the semiconductor laser bar.
- FIG. 6 is an exploded perspective view of a liquid-cooled heat sink.
- FIG. 7 is a front view of the semiconductor laser device in which the dimension in the width direction of the heat sink is increased.
- FIG. 8 is a front view of a semiconductor laser device as a comparative example.
- FIG. 9 is a perspective view of the semiconductor laser device.
- FIG. 1 is a perspective view of a semiconductor laser device.
- FIG. 2 is a side view of the semiconductor laser device as viewed from the direction of arrow II.
- FIG. 3 is a front view of the semiconductor laser device as viewed from the direction of
- FIG. 10 is a side view of the semiconductor laser device as viewed from the direction of the arrow X.
- FIG. 11 is a front view of the semiconductor laser device as viewed from the direction of arrow XI.
- FIG. 12 is a perspective view of the semiconductor laser unit.
- FIG. 13 is a side view of the semiconductor laser unit as seen from the direction of arrow XIII.
- FIG. 14 is a front view of the semiconductor laser unit as seen from the direction of arrow XIV.
- FIG. 15 is an exploded perspective view of the semiconductor laser unit.
- FIG. 16 is a front view of the semiconductor laser device in which the dimension in the width direction of the heat sink is increased.
- FIG. 17 is a front view of a semiconductor laser unit as a comparative example.
- FIG. 1 is a perspective view of the semiconductor laser device
- FIG. 2 is a side view of the semiconductor laser device viewed from the direction of arrow II
- FIG. 3 is a front view of the semiconductor laser device viewed from the direction of arrow III.
- the semiconductor laser device 10 includes a heat sink 1, a laser module 2 fixed to the heat sink 1, and a reinforcing body 3 fixed at a position facing the laser module 2 in the heat sink 1.
- a covering member can be provided on the upper surface of the heat sink 1 via an adhesive layer. Such a covering member also has a function as a sealing material when a cooling medium such as water is introduced therein.
- An O-ring or the like is disposed around the openings 1c2 and 1c3 as necessary.
- the heat sink 1 is a plate-like liquid-cooled heat sink in which a fluid passage is formed. Further, since the thickness Z1 of the heat sink 1 is 3 mm or less, the heat sink 1 is allowed to bend in the thickness direction alone. The detailed structure of the heat sink 1 is shown in FIG.
- the laser module 2 has a semiconductor laser bar 2b sandwiched between a first submount 2a and a second submount 2c.
- the first submount 2a is fixed to the upper surface of the heat sink 1 via the adhesive layer t1, and is fixed to the semiconductor laser bar 2b via the adhesive layer t2.
- the semiconductor laser bar 2 is fixed to the second submount 2c via the adhesive layer t3. That is, the first submount 2a is fixed to one surface of the semiconductor laser bar 2b, and the second submount 2c is fixed to the other surface of the semiconductor laser bar 2b.
- the linear expansion coefficient (thermal expansion coefficient) of the material which comprises each submount 2b and 2c is smaller than the linear expansion coefficient of the heat sink 1, or a shape is plate shape (cuboid).
- each submount 2a and 2c As the constituent material of the submounts 2a and 2c, Mo, W, Cu, Cu—W alloy, Cu—Mo alloy, SiC or AlN can be used, and the thickness of each submount should be 50 to 200 ⁇ m. it can.
- the reinforcing body 3 is made of plate-like molybdenum (Mo), and is located on the surface opposite to the mounting surface of the first submount in the heat sink 1 at a position facing the first submount 2a via an adhesive layer t5. It has been fixed.
- the constituent material of the reinforcing body 3 has a smaller linear expansion coefficient than that of the heat sink 1, and, unlike the submount, has a thickness in the range of 0.1 to 0.5 mm.
- the molybdenum reinforcing body 3 is a reinforcing body containing molybdenum as a main component (weight percent of 80% or more), but the same effect can be obtained even if some impurities are mixed.
- the Cu—W alloy has good thermal conductivity and is close in expansion coefficient to the semiconductor laser bar, so that it is convenient as a submount of the semiconductor laser bar.
- the submount also requires an element as an electrode, it is made of a metal material for electrical conduction.
- the alignment direction of the emission points is the Y axis (the longitudinal direction of the laser bar)
- the thickness direction of the laser bar 2b is the Z axis
- the laser beam emission direction is parallel to the X axis
- the exemplary dimensions (preferable ranges) of each component are as follows.
- X2b ⁇ X2. This is to secure an area for attaching the power supply line to the submount.
- the adhesive layers t1, t2, t3, and t5 are all made of a solder material and each have a thickness Zt.
- SnAgCu or AuSn can be used as the adhesive layer, but AuSn can be used at t2 and t3, and SnAgCu can be used at t1 and t5.
- An exemplary dimension of the thickness Zt is 10 ⁇ m, and a preferred range is 3 to 20 ⁇ m. The effect of the above numerical range will be described. When the numerical range is 3 to 20 ⁇ m, there is an effect that the solder does not protrude and can be spread over and bonded uniformly.
- the physical quantities of the liquid-cooled heat sink 1, the first submount 2a, the semiconductor laser bar 2b, the second submount 2c, and the molybdenum reinforcing body 3 are adjusted so that the curvature of the semiconductor laser bar is almost eliminated.
- FIG. 4 is an exploded perspective view of the semiconductor laser device.
- the heat sink 1 has openings (through holes) 1c2 and 1c3 for introducing a cooling medium, which communicate with openings (through holes) of a covering member that can be provided on the heat sink 1. Also good.
- the covering member is provided as needed, and can function as a sealing function for the cooling medium or as a spacer when incorporated in an external device.
- the laser module 2 is disposed on the upper surface side of the heat sink 1 via an adhesive layer and the reinforcing body 3 is disposed on the rear surface side via an adhesive layer
- heat and pressure along the Z-axis direction are simultaneously applied thereto. Apply and then fix them by cooling to room temperature.
- the temperature may be such that the adhesive layer melts.
- an appropriate covering member is disposed on the upper surface of the heat sink 1 via an adhesive layer, and is fixed by applying the same heat and pressure thereto.
- FIG. 5 is a perspective view of the semiconductor laser bar.
- the laser bar 2b has a plurality of light emitting points 2b2 arranged along a straight line on the Y axis.
- the laser bar 2b is composed of the compound semiconductor substrate 2b1, and an active layer is present at the position of the light emitting point 2b2, and a clad layer is located on both sides thereof.
- Known compound semiconductor materials include GaN, AlGaAs, GaN, AlGaN, and mixed crystals containing In.
- the laser bar 2b is mainly composed of GaAs, the active layer further contains In, and the clad layers located on both sides thereof further contain Al. Since GaAs and Cu—W alloy have close thermal expansion coefficients, the stress between the submount and the laser bar is small.
- FIG. 6 is an exploded perspective view of a liquid cooling heat sink.
- the heat sink 1 is formed by laminating and fixing three metal (Cu in this example) plate-like members 1a1, 1b1, and 1c1.
- the lowermost plate-like member 1a1 has two openings (through holes) 1a2 and 1a3 and a recess 1a4 that forms a fluid flow path together with the lower surface of the upper plate-like member 1b1.
- the recess 1a4 is continuous with the opening 1a3.
- the central plate-like member 1b1 has two openings (through holes) 1b2 and 1b3 and a plurality of through holes 1b4 constituting a fluid flow path.
- the through hole 1b4 is located at a position facing the recess 1a4.
- the upper plate-like member 1c1 has two openings (through holes) 1c2, 1c3 and a recess 1c4 that forms a fluid flow path together with the upper surface of the lower plate-like member 1b1.
- the recess 1c4 is continuous with the opening 1c2, and is not continuous with the opening 1c3.
- the cooling medium When the cooling medium is introduced into the heat sink 1 along the arrow W1 from the bottom to the top, it can pass through the open aperture groups 1a3, 1b3, 1c3 and escape to the top, as indicated by the arrow W2. As described above, the opening 1c2 can be reached through the fluid flow path defined by the recess 1a4, the through hole 1b4, and the recess 1c4. The cooling medium introduced into the heat sink 1 along the arrow W3 from the opening 1c2 can also escape downward through the open aperture groups 1c2, 1b2, 1a2.
- a plate-shaped member consists of metals, such as Cu, the surface is coat
- FIG. 7 is a front view of the semiconductor laser device in which the dimension in the width direction of the heat sink is increased.
- the Y-direction length Y1 of the heat sink 1 coincides with the Y-direction length Y3 of the reinforcing body 3, but this may be larger than Y3 as shown in FIG. Moreover, you may make the X direction length of the heat sink 1 larger than the thing of the said embodiment. Even in this case, there is an effect similar to the above embodiment.
- FIG. 8 is a front view of a semiconductor laser device as a comparative example.
- the attachment position of the reinforcing body 3 is changed to both sides of the upper surface of the heat sink 1 to form the reinforcing body 3Z.
- Other structures in the comparative example are the same as those shown in FIG.
- the liquid-cooled heat sink such as the above-described water-cooled heat sink has high performance. However, when the thickness is small, the liquid-cooled heat sink tends to bend due to a difference in linear expansion coefficient from the laser module 2.
- the stress from the laser module 2 side is applied to the heat sink 1 by fixing the molybdenum reinforcement body 3 having a small linear expansion coefficient on the opposite side to the laser module 2.
- the force that tends to bend due to (the force indicated by the arrow F2) and the force that tends to bend due to the stress from the reinforcing body 3 side (the force indicated by the arrow F3) tend to cancel each other.
- the reinforcing body 3 by attaching the reinforcing body 3 to the heat sink 1, the overall rigidity is also improved. Therefore, according to the semiconductor laser device 10 of the embodiment, the curvature of the heat sink 1 is suppressed, the displacement of the light emitting point position is suppressed, and the deterioration of the light emission characteristics can be suppressed.
- the amount of curvature of the heat sink 1 could be 1.5 ⁇ m or less with good reproducibility, and a semiconductor laser device capable of suppressing deterioration of light emission characteristics could be manufactured.
- FIG. 9 is a perspective view of a semiconductor laser device in which a plurality of semiconductor laser units 10 are stacked
- FIG. 10 is a side view of the semiconductor laser device viewed from the direction of arrow X
- FIG. 11 is a side view of the semiconductor laser device from the direction of arrow XI.
- This semiconductor laser device is a so-called semiconductor laser stack, in which a plurality of semiconductor laser units 10 are stacked along the Z axis. In the figure, an example in which three semiconductor laser units 10 are stacked is shown, but two or four or more semiconductor laser units 10 may be stacked.
- each semiconductor laser unit 10 includes a heat sink 1, a semiconductor laser module 2, and a reinforcing body 3 made of molybdenum. , And a spacer 4 having a fluid passage inside.
- the heat sink 1 is a plate-like liquid-cooled heat sink having a fluid passage formed therein, and has a rigidity capable of bending in the thickness direction as a single unit.
- the semiconductor laser module 2 includes a semiconductor laser bar 2 b at the center, and is fixed to the upper surface (one surface) side of the heat sink 1.
- the reinforcing body 3 is fixed at a position facing the semiconductor laser module 2 on the lower surface (other surface) side of the heat sink 1, but has a smaller linear expansion coefficient than the heat sink 1.
- the thickness of each reinforcing member 3 is 0.1 to 0.5 mm.
- Each unit 10 is reinforced with molybdenum and curving is suppressed, but the units 10 are stacked and pressurized. Note that the units 10 are not joined by solder but are in contact by pressing from above.
- the own heat sink 1 When attention is paid to the semiconductor laser units 10 at both ends, the own heat sink 1 has stress caused by the difference in thermal expansion coefficient with the lower reinforcing body 3 and stress caused by the difference in thermal expansion coefficient with the upper laser module 2. Since it takes the same direction and the same size, the structure as a whole cancels out stress. Therefore, also in the semiconductor laser modules 10 at both ends, the bending due to the bending of the heat sink 1 is suppressed.
- a conductive adhesive layer may be interposed between the reinforcing member 3 of the semiconductor laser unit 10 and the submount 2c positioned below the reinforcing body 3, but in this example, Are in contact.
- the material of such an adhesive layer is the same as the material of other adhesive layers t1 and the like.
- the elements located on both sides of the adhesive layer are preferably fixed by applying heat simultaneously after laminating them from the viewpoint of reducing distortion during cooling.
- the units 10 can be bonded to each other via the adhesive layer.
- the spacer 4 is interposed between the semiconductor laser units 10 and is made of a metal or an insulator. When made of a metal such as Cu, a short circuit between the semiconductor laser units 10 can be prevented by using an insulating material for the adhesive layer with the heat sink 1, but when made of an insulator such as glass or ceramic, the bonding is possible. There is no limit to the material of the layer.
- the spacer 4 is made of silicone resin (rubber), and no adhesive layer is interposed between the spacer 4 and the heat sink.
- a drive current may be supplied between the submount 2c that is the upper electrode and the submount 2a that is the lower electrode. Since each submount is electrically connected via the reinforcing body 3, in principle, a drive voltage is applied between the uppermost submount 2c and the lowermost submount 2a in the entire stack. For example, a current is supplied to all of the semiconductor laser bars 2b positioned between them, and a plurality of laser beams are emitted in the ⁇ X direction from the two-dimensional light emission points in the semiconductor laser bars 2b.
- Each heat sink 1 has two through holes 1c2 and 1c3 extending in the thickness direction, which communicate with the through holes 42 and 43 of the spacer 4, respectively.
- the cooling medium introduced along the arrow W1 from the lowermost through hole 1c3 passes through the fluid passage in the heat sink 1 and the through hole 43 of the spacer 4 as shown by the arrows W2 and W1. It can escape into the upper heat sink 1 and the through hole 1c3, and can pass through the fluid passage inside the heat sink 1 into the through hole 1c2.
- Most of the cooling medium introduced from the uppermost through-hole 1c2 along the arrow W3 can pass through the group of through-holes communicating therewith to the lowermost through-hole 1c2.
- O-rings R2 and R3 are arranged on the upper and lower surfaces of the heat sink 1 and the upper surface of the spacer 4 so as to surround the through holes 1c2, 1c3, 42, and 43 (see FIG. 10). It is preferable to improve the sealing performance between the contacting members.
- FIG. 12 is a perspective view of the semiconductor laser unit
- FIG. 13 is a side view of the semiconductor laser unit viewed from the arrow XIII direction
- FIG. 14 is a front view of the semiconductor laser unit viewed from the arrow XIV direction.
- the semiconductor laser unit is disposed on the heat sink 1, the laser module 2 fixed to the heat sink 1, the reinforcing body 3 fixed to the heat sink 1 at a position facing the laser module 2, and the upper surface of the heat sink 1.
- a spacer 4 fixed so as not to move with the pressure of.
- the spacer 4 also has a function as a sealing material when a cooling medium such as water is introduced therein, and an O-ring or the like is disposed around the openings 42 and 43 provided in the member 4 as necessary. .
- the heat sink 1 is a plate-like liquid-cooled heat sink in which a fluid passage is formed. Further, since the thickness Z1 of the heat sink 1 is 3 mm or less, the heat sink 1 is allowed to bend in the thickness direction alone. The detailed structure of the heat sink 1 is shown in FIG.
- the laser module 2 has a semiconductor laser bar 2b sandwiched between a first submount 2a and a second submount 2c.
- the first submount 2a is fixed to the upper surface of the heat sink 1 via the adhesive layer t1, and is fixed to the semiconductor laser bar 2b via the adhesive layer t2.
- the semiconductor laser bar 2 is fixed to the second submount 2c via the adhesive layer t3. That is, the first submount 2a is fixed to one surface of the semiconductor laser bar 2b, and the second submount 2c is fixed to the other surface of the semiconductor laser bar 2b.
- the linear expansion coefficient (thermal expansion coefficient) of the material which comprises each submount 2b and 2c is smaller than the linear expansion coefficient of the heat sink 1, or a shape is plate shape (cuboid).
- each submount 2a and 2c As the constituent material of the submounts 2a and 2c, Mo, W, Cu, Cu—W alloy, Cu—Mo alloy, SiC or AlN can be used, and the thickness of each submount should be 50 to 200 ⁇ m. it can.
- the reinforcing body 3 is made of plate-like molybdenum (Mo), and is located on the surface opposite to the mounting surface of the first submount in the heat sink 1 at a position facing the first submount 2a via an adhesive layer t5. It has been fixed.
- the constituent material of the reinforcing body 3 has a smaller linear expansion coefficient than that of the heat sink 1, and, unlike the submount, has a thickness in the range of 0.1 to 0.5 mm.
- the molybdenum reinforcing body 3 is a reinforcing body containing molybdenum as a main component (weight percent of 80% or more), but the same effect can be obtained even if some impurities are mixed.
- the Cu—W alloy has good thermal conductivity and is close in expansion coefficient to the semiconductor laser bar, so that it is convenient as a submount of the semiconductor laser bar.
- the submount also requires an element as an electrode, it is made of a metal material for electrical conduction.
- an XYZ three-dimensional orthogonal coordinate system is set, the alignment direction of the light emitting points is the Y axis (the longitudinal direction of the laser bar), the thickness direction of the laser bar 2b is the Z axis, and the laser beam emission direction is parallel to the X axis.
- the exemplary dimensions (preferable range) of each component are as described above.
- the X-axis direction dimension X4 of the spacer 4 is smaller than the dimension X1-X2
- the Y-axis direction dimension Y4 coincides with Y3
- the Z-axis direction dimension Z4 is set larger than Z2.
- the adhesive layers t1, t2, t3, and t5 are all made of a solder material and each have a thickness Zt.
- SnAgCu or AuSn can be used as the adhesive layer, but AuSn can be used at t2 and t3, and SnAgCu can be used at t1 and t5.
- An exemplary dimension of the thickness Zt is 10 ⁇ m, and when the spacer 4 is made of an insulator such as ceramic, the resin layer can have an adhesive layer such as a solder material interposed between the heat sink. Then, as the spacer 4, a silicone resin (rubber) is used, and it has a function of insulation and a sealing material.
- a preferred range is 3 to 20 ⁇ m. The effect of the above numerical range will be described. When the numerical range is 3 to 20 ⁇ m, there is an effect that the solder does not protrude and can be spread over and bonded uniformly.
- the physical quantities of the liquid-cooled heat sink 1, the first submount 2a, the semiconductor laser bar 2b, the second submount 2c, and the molybdenum reinforcing body 3 are adjusted so that the curvature of the semiconductor laser bar is almost eliminated.
- FIG. 7 is an exploded perspective view of the semiconductor laser unit.
- the heat sink 1 has openings (through holes) 1c2 and 1c3 for introducing a cooling medium, which communicate with the openings (through holes) 42 and 43 of the spacer 4.
- the spacer 4 is provided as necessary and has a sealing function for the cooling medium.
- the spacer 4 is provided on the laser unit at the top, and this is provided as an external device. It can also function as a spacer for incorporation.
- the laser module 2 is disposed on the upper surface side of the heat sink 1 via an adhesive layer and the reinforcing body 3 is disposed on the rear surface side via an adhesive layer
- heat and pressure along the Z-axis direction are simultaneously applied thereto. Apply and then fix them by cooling to room temperature.
- the temperature may be such that the adhesive layer melts.
- the spacer 4 is disposed on the upper surface of the heat sink 1 through an adhesive layer, and is fixed by applying the same heat and pressure thereto.
- This fixing can be performed simultaneously after all the constituent elements of the semiconductor laser unit 10 are stacked. In this case, since all stresses are simultaneously applied to each element in the fixing step, there is an advantage that distortion of each element is reduced.
- the configuration of the semiconductor laser bar is as shown in FIG.
- the exploded perspective configuration of the liquid-cooled heat sink is as shown in FIG.
- FIG. 16 is a front view of the semiconductor laser unit in which the dimension in the width direction of the heat sink is increased.
- the Y-direction length Y1 of the heat sink 1 coincides with the Y-direction length Y3 of the reinforcing body 3, but this may be larger than Y3 as shown in FIG. Moreover, you may make the X direction length of the heat sink 1 larger than the thing of the said embodiment. Even in this case, there is an effect similar to the above embodiment.
- FIG. 17 is a front view of a semiconductor laser unit as a comparative example.
- the liquid-cooled heat sink such as the above-described water-cooled heat sink has high performance. However, when the thickness is small, the liquid-cooled heat sink tends to bend due to a difference in linear expansion coefficient from the laser module 2.
- the stress from the laser module 2 side is applied to the heat sink 1 by fixing the molybdenum reinforcing body 3 having a small linear expansion coefficient on the opposite side to the laser module 2.
- the force that tends to bend due to (the force indicated by the arrow F2) and the force that tends to bend due to the stress from the reinforcing body 3 side (the force indicated by the arrow F3) tend to cancel each other.
- the rigidity of the entire body is improved by attaching the reinforcing body 3 to the heat sink 1, and by adopting a stack structure in which simultaneous bonding is performed, the stress applied to the semiconductor laser bar from both the upper and lower sides is reduced. Has been.
- the curvature of the heat sink 1 is suppressed, the displacement of the light emitting point position is suppressed, and the deterioration of the light emission characteristics can be suppressed.
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Semiconductor Lasers (AREA)
Abstract
Description
(1)ヒートシンク1の寸法
X方向長X1:30mm(10mm~30mm)
Y方向長Y1(本例では=Y3):12mm(10mm~12mm)
Z方向長Z1:1.1mm(1mm~3mm)
(2)半導体レーザモジュール2の寸法
X方向長X2:2mm(1mm~5mm)
Y方向長Y2(本例では=Y3):10mm(5mm~12mm)
Z方向長Z2:450μm(300μm~600μm)
サブマウント2aの厚みZ3a:150μm(100μm~300μm)
サブマウント2aのX方向長=X2
サブマウント2aのY方向長=Y2(=Y3)
サブマウント2cの厚みZ3c:150μm(100μm~300μm)
サブマウント2cのX方向長=X2サブマウント2cのY方向長=Y2(=Y3)
半導体レーザバー2bの厚みZ3c:140μm(100μm~150μm)
半導体レーザバー2bのX方向長X2b:2mm(1mm~5mm)
半導体レーザバー2bのY方向長Y2b=Y2(=Y3)
(3)補強体3の寸法
X方向長X3:2mm(1mm~5mm)
Y方向長Y3:10mm(5mm~12mm)
Z方向長Z3:150μm(100μm~500μm)
Claims (2)
- 直線上に配列された複数の発光点を有する半導体レーザバーと、
内部に流体通路が形成された厚みが3mm以下の板状の液体冷却式のヒートシンクと、
前記半導体レーザバーの一方面に固定され前記ヒートシンクよりも線膨張係数の小さな材料からなり前記ヒートシンクに固定された第1サブマウントと、
前記半導体レーザバーの他方面に固定され前記ヒートシンクよりも線膨張係数の小さな材料からなる第2サブマウントと、
前記ヒートシンクにおける前記第1サブマウントの取り付け面とは反対側の面の、前記第1サブマウントに対向する位置に、固定され、ヒートシンクよりも小さな線膨張係数を有する厚みが0.1~0.5mmのモリブデン補強体と、
を備えることを特徴とする半導体レーザ装置。 - 複数の半導体レーザユニットを積層してなる半導体レーザ装置において、
個々の半導体レーザユニットは、
内部に流体通路が形成された板状の液体冷却式のヒートシンクと、
半導体レーザバーを含み、前記ヒートシンクの一方面側に固定された半導体レーザモジュールと、
前記ヒートシンクの他方面側における前記半導体レーザモジュールに対向する位置に固定され、ヒートシンクよりも小さな線膨張係数を有する厚みが0.1~0.5mmのモリブデン補強体と、
を備え、
1つの前記半導体レーザユニットにおける前記モリブデン補強体の一方面は、自身の半導体レーザユニットの前記ヒートシンクに固定され、他方面は、別の半導体レーザユニットの前記半導体レーザモジュールに固定されていることを特徴とする半導体レーザ装置。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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CN201180049763.XA CN103155310B (zh) | 2010-10-15 | 2011-10-12 | 半导体激光装置 |
DE112011103477T DE112011103477T5 (de) | 2010-10-15 | 2011-10-12 | Halbleiterlaservorrichtung |
US13/877,911 US8879592B2 (en) | 2010-10-15 | 2011-10-12 | Semiconductor laser device |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2010232973A JP2012089585A (ja) | 2010-10-15 | 2010-10-15 | 半導体レーザ装置 |
JP2010232969A JP2012089584A (ja) | 2010-10-15 | 2010-10-15 | 半導体レーザ装置 |
JP2010-232969 | 2010-10-15 | ||
JP2010-232973 | 2010-10-15 |
Publications (1)
Publication Number | Publication Date |
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WO2012050132A1 true WO2012050132A1 (ja) | 2012-04-19 |
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PCT/JP2011/073433 WO2012050132A1 (ja) | 2010-10-15 | 2011-10-12 | 半導体レーザ装置 |
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US (1) | US8879592B2 (ja) |
CN (1) | CN103155310B (ja) |
DE (1) | DE112011103477T5 (ja) |
WO (1) | WO2012050132A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2018517287A (ja) * | 2015-05-19 | 2018-06-28 | ツー−シックス レーザー エンタープライズ ゲーエムベーハー | 低熱抵抗の応力制御されたダイオードレーザアッセンブリ |
US11495942B2 (en) | 2016-10-28 | 2022-11-08 | Nlight, Inc. | Method, system and apparatus for higher order mode suppression |
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US8804782B2 (en) * | 2012-10-29 | 2014-08-12 | Coherent, Inc. | Macro-channel water-cooled heat-sink for diode-laser bars |
JP6928560B2 (ja) | 2016-02-12 | 2021-09-01 | 古河電気工業株式会社 | サブマウント、半導体素子実装サブマウント、および半導体素子モジュール |
CN107221834A (zh) * | 2017-05-16 | 2017-09-29 | 西安炬光科技股份有限公司 | 半导体激光器的封装结构及封装方法 |
DE102017122575B3 (de) | 2017-09-28 | 2019-02-28 | Rogers Germany Gmbh | Kühlvorrichtung zum Kühlen eines elektrischen Bauteils und Verfahren zur Herstellung einer Kühlvorrichtung |
JP6806835B2 (ja) * | 2018-04-28 | 2021-01-06 | エスゼット ディージェイアイ テクノロジー カンパニー リミテッドSz Dji Technology Co.,Ltd | 半導体装置 |
DE102018210141A1 (de) * | 2018-06-21 | 2019-12-24 | Trumpf Photonics, Inc. | Diodenlaseranordnung und Verfahren zur Herstellung einer Diodenlaseranordnung |
DE102018210142A1 (de) * | 2018-06-21 | 2019-12-24 | Trumpf Photonics, Inc. | Diodenlaseranordnung und Verfahren zum Herstellen einer Diodenlaseranordnung |
CN111106524A (zh) * | 2018-10-29 | 2020-05-05 | 深圳市中光工业技术研究院 | 一种半导体激光器 |
CN114284857B (zh) * | 2021-11-25 | 2023-11-17 | 佛山华智新材料有限公司 | 次级热沉与液冷热沉集成方法、集成热沉及应用 |
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2011
- 2011-10-12 CN CN201180049763.XA patent/CN103155310B/zh not_active Expired - Fee Related
- 2011-10-12 WO PCT/JP2011/073433 patent/WO2012050132A1/ja active Application Filing
- 2011-10-12 US US13/877,911 patent/US8879592B2/en not_active Expired - Fee Related
- 2011-10-12 DE DE112011103477T patent/DE112011103477T5/de not_active Withdrawn
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Also Published As
Publication number | Publication date |
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CN103155310A (zh) | 2013-06-12 |
DE112011103477T5 (de) | 2013-07-25 |
US8879592B2 (en) | 2014-11-04 |
US20130279530A1 (en) | 2013-10-24 |
CN103155310B (zh) | 2015-02-11 |
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