WO2004049526A1 - レーザモジュールおよびその作製方法 - Google Patents
レーザモジュールおよびその作製方法 Download PDFInfo
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- WO2004049526A1 WO2004049526A1 PCT/JP2003/014343 JP0314343W WO2004049526A1 WO 2004049526 A1 WO2004049526 A1 WO 2004049526A1 JP 0314343 W JP0314343 W JP 0314343W WO 2004049526 A1 WO2004049526 A1 WO 2004049526A1
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- WIPO (PCT)
- Prior art keywords
- groove
- submount
- optical waveguide
- adhesive layer
- waveguide device
- Prior art date
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/37—Non-linear optics for second-harmonic generation
- G02F1/377—Non-linear optics for second-harmonic generation in an optical waveguide structure
- G02F1/3775—Non-linear optics for second-harmonic generation in an optical waveguide structure with a periodic structure, e.g. domain inversion, for quasi-phase-matching [QPM]
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4219—Mechanical fixtures for holding or positioning the elements relative to each other in the couplings; Alignment methods for the elements, e.g. measuring or observing methods especially used therefor
- G02B6/4236—Fixing or mounting methods of the aligned elements
- G02B6/4239—Adhesive bonding; Encapsulation with polymer material
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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
- H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
- H01S5/0092—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping for nonlinear frequency conversion, e.g. second harmonic generation [SHG] or sum- or difference-frequency generation outside the laser cavity
-
- 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
- H01S5/02208—Mountings; Housings characterised by the shape of the housings
-
- 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
- H01S5/02325—Mechanically integrated components on mount members or optical micro-benches
- H01S5/02326—Arrangements for relative positioning of laser diodes and optical components, e.g. grooves in the mount to fix optical fibres or lenses
Definitions
- the present invention relates to a laser module in which a semiconductor laser and an optical waveguide device are mounted on a submount, and a method for manufacturing the same.
- the capacity of optical disc devices has been increased by shortening the wavelength of light sources and increasing the NA of lenses.
- the compact disc device uses near-infrared light of 780 nm, while the digital versatile disc (DVD), which realizes higher-density information reproduction, uses 6 near-infrared light.
- a 50 nm A1GaInP red semiconductor laser is used.
- practical use of a blue light source has become indispensable.
- QPM-SHG Quadrature-Phase-Matched Second-Harmonic-Generation
- the SHG blue laser using this technology has low noise (145 dB / Hz) compared to the direct emission type GaN blue semiconductor laser, which has recently attracted attention. It has features such as a small angle variation and a small (2 V) drive voltage of the A1GaAs-based semiconductor laser, which is the fundamental wave.
- a planar direct-coupled SHG blue laser does not require a coupling lens. enough Miniaturization can be realized (for example, Japanese Patent No. 3156444,
- Figure 13 shows the configuration of a planar-type direct-coupled SHG blue laser module.
- An optical waveguide type ⁇ 3 nowadays ⁇ _ 3110 device 2 and a tunable DBR semiconductor laser 3 are mounted on a Si submount 1.
- SHG device 2 was formed on the X plate Mg_ ⁇ doped L i Nb0 3 substrate 4, and a ridge 'type optical waveguide 5 and the periodically poled regions 6.
- Li Nb ⁇ 3 Substrate 4 is sub-mounted by adhesive layer 7 made of UV-curable adhesive
- the submount 1 is joined to a housing-like package 9 by an Ag grist 8.
- the wall of the package 9 is provided with a hole 9a for extracting the output light from the SHG device 2.
- the SHG device 2 is configured to compensate for the difference between the propagation velocities of the fundamental wave light and the second harmonic light generated by the semiconductor laser 3 by the periodically poled region 6 and satisfy the pseudo phase matching condition. .
- the fundamental wave and the harmonic wave propagate through the ridge-type optical waveguide 5 as guided light, so that a long interaction length can be secured and high conversion efficiency is realized.
- the element width of L i Nb_ ⁇ 3 substrate 4 constituting the SHG device 2 to 0. 8 5 mm from 3 mm, also for S i submount 1, to 2 mm width from 5 mm, the Thickness
- the SHG device 2, submount 1, and package 9 have become more susceptible to expansion at elevated temperatures. Since the element width of the SHG device 2 has become narrower, the bonding area decreases in the width direction of the adhesive layer 7, and the bonding strength decreases. In addition, submount 1 In addition, even a small stress easily causes distortion, and the misalignment between the SHG device 2 and the semiconductor laser 3 due to a rise in temperature is more likely to occur than in the conventional device size. Misalignment due to temperature changes occurs not only during fixing to the submount 1, but also during module reliability tests such as heat cycle tests, high-temperature holding tests, and high-temperature and high-humidity tests.
- the power of the blue light which is the harmonic power
- the square of the coupling power of the infrared light which is the fundamental wave.
- a coupling shift due to a temperature change in an operating environment is likely to occur, which affects the temperature characteristics of the SHG blue laser.
- a decrease in blue output due to a decrease in coupling efficiency between the semiconductor laser and the SHG device becomes remarkable.
- An object of the present invention is to provide a laser module in which a semiconductor laser and an optical waveguide device are fixedly mounted on a submount and optically coupled to each other. Is to improve Another purpose is to suppress the reduction in the coupling power of infrared light and blue light output due to the coupling shift due to temperature changes in the storage environment or operating environment of the manufactured module. .
- a laser module according to the present invention includes a submount, a semiconductor laser fixed to the surface of the submount, and an optical waveguide bonded to the surface of the submount by an adhesive layer so as to optically couple with the semiconductor laser. Device and Is provided.
- a first groove is formed on a surface of the submount in a region corresponding to the incident end side of the optical waveguide device at a predetermined interval in parallel with the emission end surface of the semiconductor laser.
- the adhesive layer is located in a range in which an edge of the optical waveguide device on an incident end side extends from a position in contact with an edge of the first groove farther from the semiconductor laser to the inside of the first groove; In addition, it is formed so as not to contact the semiconductor laser emitting end face.
- a method of manufacturing a laser module according to the present invention includes a submount, a semiconductor laser fixed to the surface of the submount, and an optical waveguide bonded to the surface of the submount by an adhesive layer so as to optically couple with the semiconductor laser.
- a laser module including a path device and a package to which the submount is fixed is to be manufactured.
- a groove is formed on the surface of the submount in a region corresponding to the incident end side of the optical waveguide device, and the semiconductor laser is formed so that an emission end face is parallel to the groove. And fixing the first groove from the position where the edge of the adhesive layer on the optical waveguide device incident end side is in contact with the edge of the first groove far from the semiconductor laser.
- the adhesive layer is provided so that the optical waveguide device is located within the range of the groove and does not touch the emission end face of the semiconductor laser, and the optical waveguide device is bonded to the submount surface by the adhesive layer. And fixing the submount to the package in the above order.
- a groove is formed on the submount surface in a region corresponding to the optical waveguide device incident end side, and the semiconductor laser is formed so that an emission end face is parallel to the groove. Fixing the submount to the package, and fixing the submount to the package; and terminating the adhesive layer on the optical waveguide device incident end side with the first groove. Providing the adhesive layer so as to be located in a range extending from a position in contact with an edge farthest from the semiconductor laser to the inside of the second groove and not to contact the semiconductor laser emission end face; Bonding the waveguide device to the submount surface with the adhesive layer in the above order.
- FIG. 1A is a sectional view of an SHG blue laser module according to Embodiment 1 of the present invention
- FIG. 1B is a plan view thereof
- FIG. 2 is a diagram showing the relationship between the infrared light coupling output and the distance between the adhesive layer and the semiconductor laser in the case of one-point bonding.
- FIG. 3A is a diagram showing the temperature characteristics of the conventional SHG blue laser module
- FIG. 3B is a diagram showing the temperature characteristics of the SHG blue laser module of the first embodiment
- FIG. 4A is a cross-sectional view of the SHG blue laser module according to Embodiment 2 of the present invention.
- Fig. 5 is a diagram showing the relationship between the bonding power and the distance between the adhesive layer and the semiconductor laser in the case of two-point bonding.
- FIG. 6A is a cross-sectional view of another example of an SHG blue laser module according to Embodiment 2 of the present invention.
- FIG. 7 is a manufacturing process diagram of the SHG blue laser module according to the third embodiment.
- FIG. 8 is a manufacturing process diagram of the SHG blue laser module according to the fourth embodiment.
- FIG. 9A is a cross-sectional view of an SHG blue laser module according to Embodiment 5 of the present invention
- FIG. 1 OA is a cross-sectional view of an SHG blue laser module according to Embodiment 6 of the present invention
- FIG. 9A is a cross-sectional view of an SHG blue laser module according to Embodiment 5 of the present invention
- FIG. 1 OA is a cross-sectional view of an SHG blue laser module according to Embodiment 6 of the present invention
- FIG. 11 is a plan view of an SHG blue laser module according to Embodiment 7 of the present invention.
- FIG. 12A is a cross-sectional view of an SHG blue laser module according to Embodiment 8 of the present invention.
- FIG. 13 is a cross-sectional view of a conventional SHG blue laser module. BEST MODE FOR CARRYING OUT THE INVENTION
- the position of the adhesive layer for fixing the optical waveguide device can be changed. It can be controlled to a suitable range. This suppresses the coupling deviation between the semiconductor laser and the optical waveguide device caused by distortion due to thermal change, and ensures the reliability of the coupled output of infrared light and the output of blue light in the storage environment and operating environment. Is done.
- the distance D between the emission end face of the semiconductor laser and the adjacent edge of the adhesive layer is Omm ⁇ D ⁇ 0.2 mm.
- a configuration may be employed in which the adhesive layer is partially provided at one position near the incident end face of the optical waveguide device.
- the adhesive layer may be partially provided in at least two places near the incident end face of the optical waveguide device and near the emission end face of the waveguide device.
- the optical waveguide device is provided on the submount surface in a region corresponding to the emission end side of the optical waveguide device.
- a second groove is formed in parallel with the emission end face of the heat sink, and an adhesive layer near the emission end face is provided along the second groove.
- the area of the adhesive layer near the incident end face is preferably larger than the area of the adhesive layer near the output end face.
- the submount surface in a region corresponding to the optical waveguide device incident end side, is parallel to the first groove, and is located between the first groove and the optical waveguide device output end surface.
- a third groove is formed. In that case, it is preferable that the distance L1 between the first groove and the third groove is lmm ⁇ L1 ⁇ LZ2 with respect to the length L of the optical waveguide device.
- a position between the second groove and the optical waveguide device incident end surface is preferably, on the submount surface in a region corresponding to the optical waveguide device emission end side, parallel to the second groove. And a fourth groove to be formed.
- the distance L2 between the second groove and the fourth groove is lmm ⁇ L2 ⁇ LZ2 with respect to the length L of the optical waveguide device.
- the thickness T1 of the optical waveguide device is preferably T1 ⁇ 1 mm.
- the optical waveguide device has a width W of 0.85 mm.
- the length L of the optical waveguide device is L> 10 mm.
- the thickness T 2 of the submount is T 2 ⁇ 0.3 mm.
- optical waveguide device a QPM-SHG (Quasi-Phase-Matched Second Harmonic Generation) device can be used. Further, an optical fiber may be used as the optical waveguide device.
- QPM-SHG Quadasi-Phase-Matched Second Harmonic Generation
- the optical waveguide device when the optical waveguide device is bonded and fixed at two places, after the incident end side is bonded and fixed, the submount is mounted. Then, the emission end side is bonded and fixed. Therefore, it is possible to avoid a coupling shift caused by a distortion due to a thermal change when the submount is fixed to the package, and to secure a reliability of a coupling output of the infrared light and an output of the blue light.
- the optical waveguide device is bonded and fixed on the submount. Therefore, the effect of avoiding the bonding displacement caused by the distortion due to the thermal change when fixing the submount package is larger than the first manufacturing method.
- an adhesive is poured between the vicinity of the emission end face of the optical waveguide device and the submount, so that the optical waveguide device has The vicinity of the emission end face is fixed to the submount.
- FIGS. 1A and 1B The SHG blue laser module according to the first embodiment will be described with reference to FIGS. 1A and 1B.
- 1A is a sectional view
- FIG. 1B is a plan view.
- the basic configuration of this laser module is the same as that of the conventional example shown in FIG. 13, and the same elements are denoted by the same reference numerals.
- An optical waveguide type QPM-SHG device 2 and a tunable DBR semiconductor laser 3 are mounted on a Si submount 10.
- SHG device 2 is an optical wavelength conversion Debaisu is formed on the X plate M G_ ⁇ doped L i N B_ ⁇ 3 substrate 4, and a ridge type optical waveguide 5 and the periodically poled regions 6.
- L i N b 0 3 substrate 4 the adhesive layer 1 1 made of an ultraviolet curable adhesive, it is bonded to a submount 1 0.
- the submount 10 is joined to a housing-like package 9 by an Ag paste 8.
- Package The wall of the page 9 is provided with a hole 9a for extracting the output light from the SHG device 2.
- the first groove 12 is formed on the surface of the submount 10.
- the first groove 12 is used to fix the position of the adhesive layer 11 near the emission end of the semiconductor laser 3 when the SHG device 2 is fixed on the submount 10 with the adhesive layer 11 at one place. Functions as a controlling structure. By controlling the position of the adhesive layer 11 in such a manner, it is possible to secure the fundamental wave coupling power and the stability of the blue output when the temperature of the module changes. The effect will be explained later.
- the first groove 12 has a width of, for example, 0.2 mm and a depth of 50 im, and is V-shaped by etching so as to be orthogonal to the optical axis direction. Therefore, the first groove 12 is parallel to the emission end face of the semiconductor laser 3. Normally, the first groove 12 may be arranged at a position in contact with the emission end face of the semiconductor laser 3, that is, at a position where the distance from the emission end face of the semiconductor laser 3 is zero. Generally, the position of the first groove 12 is determined by a method of applying an adhesive for forming the adhesive layer 11 such that a predetermined distance is provided between the first groove 12 and the emission end face of the semiconductor laser 3. It can be set according to. The first groove 12 provides the following two effects.
- the first effect is that the adhesive layer 11 is positioned with reference to the first groove 12 and the distance D between the edge of the adhesive layer 11 and the emission end face of the semiconductor laser 3 (see FIG. 1A). It is easy to control within a predetermined range.
- the distance D is the distance between the emitting end face of the semiconductor laser 3 and the adjacent edge of the adhesive layer 11, that is, the edge facing the semiconductor laser 3.
- the edge contacts the SHG device 2 of the adhesive layer 11 Defined as the edge of the part
- the adhesive layer 11 is provided so that the edge thereof is in contact with the edge of the first groove 12 on the side remote from the semiconductor laser 3.
- edge of the adhesive layer 11 is generally not a straight line but a curved line
- contact means that at least a part of the edge contacts the first groove 12.
- to be in contact may be any state that is “substantially in contact”. That is, the edge of the adhesive layer 11 is not limited to the state where the edge of the first groove 12 and the edge of the adhesive layer 11 coincide with each other, and the edge of the adhesive layer 11 enters the first groove 12. Including the state where it is. Also, a state in which the edge of the adhesive layer 11 is slightly separated from the edge of the first groove 12 is included.
- substantially touch means that the edge of the adhesive layer 11 is sufficiently close to the first groove 12, and that the edge of the adhesive layer 11 is small enough to obtain the positioning effect by the first groove 12. Includes error range. Therefore, in practice, the end of the adhesive layer 11 may be located in a range extending from a position in contact with the edge of the first groove 12 farther from the semiconductor laser 3 to the inside of the first groove 12. it can. However, it is necessary that the adhesive layer 11 is arranged so as not to contact the emission end face of the semiconductor laser 3.
- the position of the adhesive layer 11 be controlled so that the above-mentioned distance D is within 0.2 mm. Provision of the first groove 12 facilitates such positioning control.
- the effect of setting the distance D within 0.2 mm will be described with reference to FIG.
- the horizontal axis in FIG. 2 indicates the distance D between the semiconductor laser 3 and the adhesive layer 11. Hatada points indicate the distribution of distance D in the module of the present embodiment. It can be seen that the distance D is controlled to approximately 0.2 mm.
- the vertical axis in Fig. 2 shows the relationship between the infrared light coupling output and the distance D.
- the submount on which the SHG device 2 was mounted was positioned in the package, and then subjected to a heat treatment of 80 X 2H (Ag paste curing conditions).
- the distance D is less than 0.2 mm.
- the output of infrared coupling after fixing to the package is the same as the output before fixing to the package. In other words, this indicates that the submount can be fixed in the package without causing a coupling shift.
- the distance D can be controlled to approximately 0.2 mm, so that the coupling deviation is sufficiently suppressed.
- the distance D is 0.2 mm or less, the infrared light coupling output is maintained, so that the distance D may be controlled to be 0.2 mm or less.
- the dots shown in Fig. 2 show the distribution of the distance D in the fabricated module in the case of the module structure using the conventional submount (Fig. 13). Since the first groove 12 is not formed, the application position of the adhesive cannot be controlled, and the distance D fluctuates beyond 0.2 mm. If the distance D exceeds 0.2 mm, the coupling shift of the SHG device 2 after fixing the package becomes large, and the reduction of the infrared light coupling output increases.
- L i Nb 0 3 substrate constituting the SHG device, S i submount, C u is a contact and packaging materials, are different from each coefficient of linear expansion. Therefore, during the heat treatment process for fixing to the package, the temperature rises from room temperature of 25 to 80, so that each material has a different expansion amount, and distortion occurs from the fixing point of the adhesive as a base point . If the adhesive layer is close to the emitting end face of the semiconductor laser, the SHG device's fixed position will be maintained even if there is a distortion due to the temperature rise, and no displacement will occur. However, when the adhesive layer is far from the emission end face of the semiconductor laser, the coupling shift due to the strain becomes so large that the infrared light coupling output decreases when the temperature rises. The following conditions are the main factors that tend to cause the coupling shift due to distortion.
- the device structure shown in 1) to 3) is secured by forming the first groove 12 in the Si submount 10 and controlling the position of the adhesive layer 11. In this state, misalignment of the SHG element 2 after fixing to the package can be avoided.
- the configuration of the present embodiment is particularly effective when applied to the following laser module.
- the thickness T 1 of the optical waveguide device is T 1 ⁇ lmm. Since such a thin optical waveguide device has a small substrate thickness, it is effective in terms of cost and module miniaturization.
- the width W of the optical waveguide device is W ⁇ 0.85 mm. Since the number of devices per wafer can be increased, cost can be reduced and the module can be downsized.
- the length L of the optical waveguide device is L> 10 mm. Increasing the length of the optical waveguide device improves the conversion efficiency and is effective in increasing the output.
- the thickness T2 of the submount is T2 ⁇ 0.3mm. Since the submount substrate can be made thinner, it is effective in terms of cost reduction and module miniaturization.
- the second effect of providing the first groove 12 is that the ultraviolet curing agent for forming the adhesive layer 11 flows into the end face of the semiconductor laser 3 during application of the SHG device 2 after application. That is, it has the effect of preventing the occurrence of the This will be described below.
- the adhesive layer 7 is attached to the emitting end face of the semiconductor laser 3 in order to avoid a displacement due to a temperature change. Attempts were made to bring the distance closer to within 0.2 mm. Therefore, when an adhesive was applied to the vicinity of the emission end face of the semiconductor laser 3, the adhesive frequently moved toward the semiconductor laser 3 during positioning of the SHG device 2, and wrapped around the end face of the semiconductor laser 3. If the adhesive wraps around the end face of the semiconductor laser 3, the emission end face is degraded when the semiconductor laser 3 emits light, causing a decrease in power. On the other hand, when the groove is formed as in the present embodiment, the adhesive can be prevented from sneaking into the end face of the semiconductor laser 3, and the mounting yield of the SHG device 2 is improved.
- the position of the first groove 12 is preferably set so that the distance between the first groove 12 and the emission end face of the semiconductor laser 3 is within the range of 0.2 mm to 0.2 mm. Within this range, it is easy to control the distance D between the edge of the adhesive layer 11 and the emission end face of the semiconductor laser 3 to within 0.2 mm with reference to the first groove 12.
- the width of the first groove 12 is preferably smaller than 0.2 mm. If the groove width is larger than that, it becomes difficult to control the distance between the adhesive layer 11 and the semiconductor laser 3 to less than 0.2 mm, and a displacement occurs when the temperature changes.
- the narrower the groove width the easier it is to control the position of the adhesive layer 11 to a desired range, but on the other hand, the more easily the adhesive flows into the semiconductor laser 3 or the waveguide section of the SHG device 2. In that case, by providing a relief groove or increasing the depth of the groove, it is possible to prevent the adhesive from flowing around.
- the first The adhesive that has flowed into the groove 12 also has a function of joining the SHG deice 2 depending on the thickness of the adhesive layer, so the position of the adhesive layer 11 needs to be set in consideration of this.
- the adhesive layer 11 is also located near the incident end face of the SHG device 2 (at a position 0.2 mm from the incident end).
- the emission end face of the semiconductor laser 3 and the incidence end face of the SHG device 2 are directly coupled at almost zero intervals. Since the adhesive layer 11 is located near the incident end face of the SHG device 2, the influence of the expansion of the SHG device 2 in the optical axis direction when the temperature rises can be reduced as follows.
- Linear expansion coefficient of the SHG device 2 is a 14 X 10- 6. Therefore, if the fixed position is 0.5 mm away from the incident end face of the SHG device 2, the SHG device 2 will move in the direction of the optical axis, that is, the side of the emitting end of the semiconductor laser 3 with the temperature rise from 25 ° C to 80 ° C. It will extend approximately 0.4 m toward.
- the distance between the SHG device 2 incident end face and the semiconductor laser 3 emission end face be almost 0 mm.
- the position of the adhesive layer 11 can be controlled at a position 0.2 mm from the incident end of the SHG element 2, the position of the adhesive layer 11 can be controlled in the optical axis direction when the temperature rises from 25 ° C to 80 nC .
- the expansion of is only 0.1 am. Therefore, the possibility that the SHG device 2 and the semiconductor laser 3 are bonded or damaged due to contact is extremely low.
- each of the SHG blue laser modules fabricated according to this embodiment The species reliability will be described.
- various reliability must be ensured under storage environment and operating environment.
- the coupling power and the reliability of blue light output in the storage environment are described.
- a high-temperature continuous test 100 t: X 500 H
- a heat cycle test 45: up to 80 ° C (1 cycle) X 200 cycles
- a high-temperature high A reliability test of the bonding power in a humid environment 60 ° C 90% X500H
- FIG. 3A shows the temperature characteristics of the position of the adhesive layer, that is, the transmission efficiency of the SHG device in the module in which the distance D shown in FIG. 1 is 0.5 mm.
- the transmission efficiency is the value obtained by dividing the infrared coupling output after completion of the module by the infrared light output of the semiconductor laser alone. A decrease in transmission efficiency indicates a deterioration in the temperature characteristics of the module.
- the SHG blue laser module between 10 ° C and 60 ° C is used.
- the temperature characteristics of the transmission efficiency were not degraded, and stable transmission efficiency was obtained regardless of the temperature.
- the coupling power was stable even under the module operating environment (here, 10 ° C to 60 ° C), and it was demonstrated that the module structure in the present embodiment had good temperature characteristics.
- the example of the short wavelength laser module in which the wavelength tunable DBR semiconductor laser 3 and the optical waveguide type QPM-SHG device 2 are directly coupled has been described.
- the present invention is not limited to this.
- the idea of the present embodiment can be similarly applied to other embodiments.
- the present invention is applicable to all types of semiconductor lasers regardless of the type and wavelength of the semiconductor laser.
- the optical waveguide device is not limited to the ridge-type optical waveguide, but can be applied to a case where all optical waveguide devices are used, including a proton exchange type optical waveguide and an optical fiber.
- the substrate material of the optical waveguide device is not limited to L i Nb0 3, silica-based optical waveguide and the like, can also be used in the case of using the other optical waveguide material.
- the laser module of the present embodiment is not limited to the optical disk device, and can be applied to all direct coupling type optical waveguide laser modules in the field of optical communication and the like.
- the present invention is not limited to this.
- Si and Cu having excellent heat conductivity are used as the material of the submount 10 and the package 9, but the present invention is not limited to this.
- the formation of the first groove 12 in the submount 10 is not limited to the above-described etching, but may be applied to the formation of the first groove 12 or the like.
- the first groove 12 having a width of 0.2 mm is arranged so that the adhesive layer 11 near the incident end of the SHG device 2 is positioned at a position of 0.2 mm from the emitting end face of the semiconductor laser 3. Was formed.
- the width of the first groove 12 and further bringing it closer to the semiconductor laser 3 the reliability of the coupling power when the temperature is further increased (100 ° C. or more) can be secured.
- the length of the adhesive layer 11 in the width direction of the SHG device 2 that is, in the direction perpendicular to the optical axis, is made the same as the width of the SHG device 2,
- the bond strength is maximized, which is effective in ensuring the reliability of the bonding power.
- the SHG blue laser module according to Embodiment 2 will be described with reference to FIGS. 4A and 4B.
- the basic configuration of this laser module is the same as that of the first embodiment shown in FIGS. 1A and 1B. 0, and the same elements are denoted by the same reference numerals to simplify the description.
- the optical waveguide device, Mg_ ⁇ dough flop L i N B_ ⁇ 3 substrate 4 optical waveguide produced by using the QPM- a SHG device 2 the semiconductor
- the laser 3 is a DBR semiconductor laser having a wavelength tunable function
- the device 2 is fixed on the 3i submount 10 with two adhesive layers 11 and 13 made of an ultraviolet curing adhesive. Then, a structure is used in which the position of one adhesive layer 11 is controlled near the emission end of the semiconductor laser 3 by the first groove 12 provided in the submount 10 as in the first embodiment. As a result, the fundamental wave coupling power and the blue output stability when the module temperature changes are secured.
- the other The adhesive layer 13 is disposed near the emission end of the SHG device 2.
- FIG. 5 shows the relationship between the infrared light coupling output and the distance D between the emitting end face of the semiconductor laser 3 and the edge of the adhesive layer 11 in the case of two-point bonding. As shown in FIG. 5, as compared with the case of the single-point fixing shown in FIG. 2, the bond shift occurring after fixing to the package has a more significant dependence on the distance between the adhesive layer 11 and the semiconductor laser 3. .
- the first groove 12 (width 0.2 111111 and depth 50) is formed on the Si submount 10 so as to prevent the coupling displacement and the adhesive from flowing around the semiconductor laser 3 so as to be parallel to the emission end face of the semiconductor laser 3.
- the structure in which 111) is formed is more remarkable in comparison with the first embodiment in the effect of avoiding the bond shift.
- the structure in which the SHG device 2 is fixed at two locations is particularly useful when an SHG laser is mounted on an optical disc device when recording / reproducing an optical disc having two recording layers. That is, in the optical pickup, it is necessary to obtain a good signal even when the drive temperature changes.
- NA 0.85, wavelength 410 nm
- the movement of the light emitting point can be adjusted horizontally and vertically for a temperature change of -10 to 70 ° C ( ⁇ 40 ° C). In both directions, it is necessary to keep it below ⁇ 1 ⁇ . If the moving distance of the light emitting point is large, the tracking servo of the optical disc will be out of alignment. The reproduction / recording operation becomes unstable.
- the position of the light emitting point of the optical pickup is likely to be shifted due to the temperature change.
- the movement amount of the light emitting point due to the bimetal effect tends to be large.
- measurement results have been obtained in which the shift amount of the light emitting point is ⁇ or more for a temperature change of ⁇ 40 ° C.
- the light emitting point displacement exceeded the permissible amount for a blue light two-layer disc, and servo was not applied.
- the vicinity of the emission end face of the SHG device 2 is also fixed, the bimetal effect is suppressed, and the position shift of the light emitting point is suppressed, and a good signal is obtained.
- a measurement result was obtained in which the light emitting point shift amount was ⁇ or less. Therefore, in a blue laser module used in an optical disc device compatible with a two-layer disc, it is very important to fix at least the SHG device 2 at two or more positions including a position near the input / output end face.
- the present embodiment it is possible to secure the reliability when the coupling power and the blue power change in temperature, and to suppress the light emitting point position shift amount to a desired range. More practical than one.
- the area of the adhesive layer 11 on the incident end side should be larger than the area of the adhesive layer 13 on the output end side. Is effective.
- the main cause of the bond shift is the position shift on the entrance end side of the SHG device 2.Therefore, it is extremely effective to increase the adhesive strength by increasing the area of the adhesive layer 11 on the entrance end side. It is.
- a fixed location is provided at the center of the SHG device 2 at one location, or at three locations, or over the entire surface of the SHG device 2
- increasing the number of fixed points increases the tact time and increases the amount of adhesive, making it difficult to position the SHG device 2 smoothly. Is optimal.
- curing the adhesive layer 11 on the incident end side by ultraviolet irradiation before the adhesive layer 13 on the output end side can improve the mounting yield of the SHG device 2. Because it is very effective. This is because such a procedure makes it possible to avoid displacement of optical coupling due to heat generated when the adhesive layer 11 on the emission end side is irradiated with ultraviolet rays.
- a second groove 15 is formed at a position corresponding to the adhesive layer 13 on the emission end side.
- the adhesive layer 13 for fixing the emission end side of the SHG device 2 can be accurately positioned in the optical axis direction. The closer the adhesive layer 13 is to the emission end face of the SHG device 2, the smaller the amount of displacement of the light emitting point is. Control the position of layer 13.
- FIGS. 7A and 7B A method for manufacturing the SHG blue laser module according to Embodiment 3 will be described with reference to FIGS. 7A and 7B.
- This fabrication method has a structure in which the SHG device 2 is fixed at two locations as shown in Figs. 4A and 4B.
- the SHG device 2 when the SHG device 2 is fixed to the Si submount 10 at two places, first, the SHG device 2 is fixed at one place near the incident end of the SHG device 2 with an adhesive. Next, after fixing the submount 10 to the metal package 9, the emission end side of the SHG device 2 is fixed with an adhesive.
- the function of the first groove 12 formed in the submount 10 is utilized, and it is hard to be affected by distortion due to heating in the manufacturing process.
- a first groove 12 is formed on the surface of the Si submount 10.
- the wavelength tunable semiconductor laser 3 is mounted on the basis of the first groove 12.
- the SHG device 2 is mounted on the Si submount 10 with high accuracy with respect to the semiconductor laser 3.
- the SHG device 2 is fixed at one point on the incident end side by an adhesive layer 11 made of an ultraviolet curable resin formed based on the first groove 12.
- the adhesive layer 11 By positioning the adhesive layer 11 in the first groove 12, the SHG device 2 is fixed while maintaining a distance of 0.2 mm from the emitting end face of the semiconductor laser 3.
- the submount 10 on which the semiconductor laser 3 and the SHG device 2 are mounted in the predetermined position of the package 9 is thermally cured with Ag paste 8 at 80 ° C X 2H. Fix it.
- an ultraviolet-curing resin is poured into the gap between the submount 10 and the SHG device 2 at room temperature, and the poured adhesive is cured by irradiation with ultraviolet light, and the emission end face of the SHG device 2 is emitted. Fix the vicinity with adhesive layer 13.
- This manufacturing method is different from the method of fixing the SHG device 2 to the Si submount 10 at two places and then fixing the submount 10 to the metal package 9 at a room temperature of the manufactured SHG blue laser module.
- High joule stability That is, when the Si submount 10 is heated to 80 ° Cfc to fix it to the package 9 and returned to room temperature after fixing, the wires of the SHG device 2, the Si submount 10 and the metal package 9 are fixed. Each is distorted due to the difference in expansion coefficient. At that time, if the SHG device 2 is fixed at two points, the strain cannot be released, and partial stress is likely to be applied, resulting in occurrence of a coupling shift.
- a method of manufacturing the SHG blue laser module according to Embodiment 4 will be described with reference to FIGS. 8A and 8B.
- This fabrication method also targets a laser module having a structure in which the SHG device 2 is fixed at two places as shown in FIGS. 4A and 4B.
- the Si submount 2 is fixed to the package 9, and then the SHG device 2 is fixed to the Si submount at two locations.
- the structure is less affected by the distortion due to heat, and high reliability of the coupling power can be secured.
- a first groove 12 is formed on the surface of the Si submount 10.
- the wavelength tunable semiconductor laser 3 is mounted with the first groove 12 as a reference.
- the submount 10 is fixed at a predetermined position of the package 9 by thermally curing the Ag paste 8 at 80 ° C. 2 H.
- the SHG device 2 is mounted on the submount 10 fixed in the package 9 with high accuracy on the semiconductor laser 3.
- the ultraviolet light formed based on the first groove 12 The SHG device 2 is fixed at one position on the incident end side by an adhesive layer 11 made of a cured resin. By positioning the adhesive layer 11 in the first groove 12, the SHG device 2 is fixed while maintaining a distance of 0.2 mm from the emitting end face of the semiconductor laser 3.
- an ultraviolet curable resin is poured into the gap between the submount 10 and the SHG device 2, cured by irradiation with ultraviolet light, and the vicinity of the emission end face of the SHG device 2 is fixed with an adhesive layer 13 I do.
- the reason why the SHG blue laser fabricated by the method of the present embodiment has higher module stability at room temperature than the module fabricated by the method of the third embodiment is as follows. That is, in the third embodiment, during the heat treatment at 80 for fixing the submount 10 to the package 9, the SHG device 2 is fixed at one point near the incident end side. Even when only one fixing point is used, when the temperature is returned to room temperature, a slight distortion remains in the SHG device 2 due to the difference in linear expansion coefficient between the SHG device 2, Si submount, and metal package. I do.
- the manufacturing method of the present embodiment since the heat treatment is performed before fixing the SHG device 2, the stress caused by the distortion due to the difference in the linear expansion coefficient between each element is applied to the SHG device 2. There is no such thing. Therefore, the SHG device 2 is fixed on the submount 10 at two locations near the input / output end, and the packaged laser module can have high reliability at room temperature.
- This laser module is an improvement of the configuration shown in Figs. 1A and IB.
- the improvement is that a third groove 17 is formed on the Si submount 16 in parallel with the first groove 12.
- the third groove 17 is located between the first groove 12 and the emission end face of the SHG device 2 in a region corresponding to the incident end side of the SHG device 2.
- the first groove 12 and the third groove 17 have a width of 0.2 mm and a depth of 50 / zm, and are formed by etching.
- the distance L 1 between the third groove and the first groove 12 is set in a range of 1 mm ⁇ L 1 ⁇ LZ2 with respect to the length of the 3110 device 2.
- the laser module according to Embodiment 6 will be described with reference to FIGS. 10A and 10B.
- This laser module is an improvement of the configuration for fixing the two locations shown in FIGS. 6A and 6B.
- the improvement is that a third groove 17 is formed on the Si submount 18 in parallel with the first groove 12 and a fourth groove 19 is formed in parallel with the second groove 15. That is.
- the third groove 17 This is the same as in the fifth embodiment.
- the fourth groove 19 is located between the second groove 15 and the incident end face of the SHG device 2 in a region corresponding to the emission end side of the SHG device 2.
- the fourth groove 19 is provided for controlling the area of the adhesive, similarly to the third groove 17. That is, in the present embodiment, by providing the second groove 15 and the fourth groove 19, the adhesive layer 13 is controlled to have a desired adhesive area and adhesive shape. Therefore, the distance L 2 between the second groove 15 and the fourth groove 19 is set in the range of 1 mm ⁇ L 2 ⁇ LZ2 with respect to the length L of the SHG device 2.
- the dimensions of the adhesive layers 11 and 13 on the incident end side and the exit end side in the longitudinal direction of the SHG device 2 could be controlled to be constant.
- the fabricated laser module was able to obtain stable adhesive layer dimensions and adhesive strength. Further, by forming a pair of symmetrical grooves, the thickness distribution of the adhesive layer can be made uniform, so that more stable adhesive strength can be obtained.
- the module structure described in the present embodiment it is possible to reduce the influence of distortion due to a temperature change, and to further increase the strength of the adhesive at the entrance end and the exit end.
- the laser module according to Embodiment 7 will be described with reference to FIG.
- This laser module is an improvement of the configuration shown in FIGS. 10A and 10B.
- the improvement is that the first to fourth grooves 21 to 24 formed on the Si submount 20 have not a fixed width but a widened shape at both ends. According to this groove shape, the widened end portions function as a pool for the adhesive. Therefore, even when a large amount of adhesive is applied, an effect of suppressing the adhesive from flowing into the end face of the semiconductor laser 3 can be obtained.
- the laser module according to Embodiment 8 will be described with reference to FIGS. 12A and 12B.
- This laser module has a configuration using an optical fiber 125 as an optical waveguide device instead of the SHG device in the above embodiment.
- the basic configuration is the same as that shown in FIGS. 4A and 4B, and the position of the adhesive layer 11 is controlled by the first groove 12 formed on the submount 10.
- the incident end face of the optical fiber 125 is fixed to the submount 10 by the adhesive layer 11, and is positioned with respect to the emission end face of the semiconductor laser 3.
- the output side of the optical fiber 125 is also fixed to the submount 10 by the adhesive layer 13.
- the adhesive displacement which fixes an optical waveguide device can be located in a suitable range, and can suppress the coupling shift
- high reliability of the combined output of the infrared light and the output of the blue light in the storage environment and the operating environment is secured, and a laser module suitable for an optical pickup or the like can be manufactured with high yield.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/534,438 US7494286B2 (en) | 2002-11-12 | 2003-11-12 | Laser module and method for manufacturing the same |
AU2003280727A AU2003280727A1 (en) | 2002-11-12 | 2003-11-12 | Laser module and its fabrication method |
JP2004554972A JPWO2004049526A1 (ja) | 2002-11-12 | 2003-11-12 | レーザモジュールおよびその作製方法 |
Applications Claiming Priority (2)
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JP2002328053 | 2002-11-12 | ||
JP2002-328053 | 2003-11-12 |
Publications (1)
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WO2004049526A1 true WO2004049526A1 (ja) | 2004-06-10 |
Family
ID=32375707
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PCT/JP2003/014343 WO2004049526A1 (ja) | 2002-11-12 | 2003-11-12 | レーザモジュールおよびその作製方法 |
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Country | Link |
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US (1) | US7494286B2 (ja) |
JP (1) | JPWO2004049526A1 (ja) |
CN (1) | CN100358196C (ja) |
AU (1) | AU2003280727A1 (ja) |
WO (1) | WO2004049526A1 (ja) |
Cited By (3)
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CN105226499A (zh) * | 2015-09-22 | 2016-01-06 | 湖北捷讯光电有限公司 | 飞秒激光器分体式盘纤控温槽 |
WO2022071381A1 (ja) * | 2020-09-30 | 2022-04-07 | 住友大阪セメント株式会社 | 光導波路素子及びそれを用いた光変調デバイス並びに光送信装置 |
WO2022249234A1 (ja) * | 2021-05-24 | 2022-12-01 | 日本電信電話株式会社 | 波長変換装置及び波長変換装置の製造方法 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100054289A1 (en) * | 2008-08-29 | 2010-03-04 | Cobolt Ab | Solid-state laser |
JP2013200550A (ja) * | 2012-02-20 | 2013-10-03 | Sumitomo Electric Ind Ltd | レンズ部品及びそれを備えた光モジュール |
WO2023217637A1 (en) * | 2022-05-09 | 2023-11-16 | X-Celeprint Limited | High-precision printed structures and methods of making |
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- 2003-11-12 CN CNB2003801031473A patent/CN100358196C/zh not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
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CN1720649A (zh) | 2006-01-11 |
AU2003280727A1 (en) | 2004-06-18 |
JPWO2004049526A1 (ja) | 2006-03-30 |
US7494286B2 (en) | 2009-02-24 |
CN100358196C (zh) | 2007-12-26 |
US20060034570A1 (en) | 2006-02-16 |
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