WO2011001765A1 - レーザー照射装置及びレーザー加工方法 - Google Patents
レーザー照射装置及びレーザー加工方法 Download PDFInfo
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- WO2011001765A1 WO2011001765A1 PCT/JP2010/058928 JP2010058928W WO2011001765A1 WO 2011001765 A1 WO2011001765 A1 WO 2011001765A1 JP 2010058928 W JP2010058928 W JP 2010058928W WO 2011001765 A1 WO2011001765 A1 WO 2011001765A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/067—Dividing the beam into multiple beams, e.g. multifocusing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/0604—Shaping the laser beam, e.g. by masks or multi-focusing by a combination of beams
- B23K26/0613—Shaping the laser beam, e.g. by masks or multi-focusing by a combination of beams having a common axis
- B23K26/0617—Shaping the laser beam, e.g. by masks or multi-focusing by a combination of beams having a common axis and with spots spaced along the common axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/08—Devices involving relative movement between laser beam and workpiece
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/40—Removing material taking account of the properties of the material involved
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/50—Working by transmitting the laser beam through or within the workpiece
- B23K26/53—Working by transmitting the laser beam through or within the workpiece for modifying or reforming the material inside the workpiece, e.g. for producing break initiation cracks
-
- 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
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/50—Inorganic material, e.g. metals, not provided for in B23K2103/02 – B23K2103/26
Definitions
- the present invention relates to a laser irradiation apparatus used for laser processing of ceramics and the like and a laser processing method using the same.
- Hard and brittle materials such as ceramic materials, glass materials, and silicon materials are used for circuit boards and the like on which electronic components are mounted.
- Laser processing is widely used as such forming means.
- Laser processing condenses the laser beam emitted from the light source using an irradiation optical system such as a lens, and irradiates the surface or the inside of the substrate with a laser focused spot (beam waist) with high power density to perform processing. It is something to do.
- the substrate it is required to form fine grooves and holes in the substrate and to form the grooves and holes deeply in order to miniaturize the electronic parts and to improve the yield of the substrate by reducing the number of processing parts. ing.
- hole processing it is required to form a fine hole with few tapers.
- the method (A) requires a focusing means such as a lens of a special shape.
- the method (B) it is difficult to make the optical axes of the two synthesized laser beams coincide with each other, and it is necessary to prepare a reflecting surface having a large radius of curvature, which causes problems in manufacture and preparation .
- the method (C) has problems such as a decrease in processing efficiency and a decrease in positional accuracy between processings.
- the present invention has been made in view of these problems, and realizes the formation of a plurality of beam waists by an irradiation optical system having a simple configuration, and easily changes the intervals of the plurality of beam waists on the optical axis of the laser beam.
- -It aims at provision of the laser irradiation apparatus which can be adjusted, and the laser processing method using the same.
- a light source for emitting a laser beam An irradiation optical system having one or more lenses and guiding and condensing a laser beam emitted from a light source to an object, comprising: A birefringent material is used as a material of at least one lens of the above-mentioned irradiation optical system.
- the said laser irradiation apparatus consists of a simple and easy structure of using a birefringent material as a raw material of the at least 1 lens of an irradiation optical system.
- a birefringent material as a material of at least one lens of the irradiation optical system
- the component of the laser beam emitted from the light source is separated into the ordinary light and the extraordinary light without spatial separation, and the ordinary light and the extraordinary light are separated.
- the laser irradiation apparatus can form a plurality of beam waists reliably and easily.
- the irradiation optical system includes a first lens, which is a concave lens or a convex lens, and a second lens, which is a convex lens, in order of traveling direction of a laser beam, and a beam extract that can change the distance between the first lens and the second lens.
- a birefringent material is used as a material of the first lens and / or the second lens, including a panda.
- the irradiation optical system may include a condensing lens disposed at the end of the traveling direction of the laser beam, and a birefringent material may be used as a material of the condensing lens.
- a condenser lens in the irradiation optical system has birefringence, and it is not necessary to separately prepare and arrange a lens using a birefringent material as a material, and the irradiation optical system can be simplified. it can.
- the crystal axis direction of the lens made of the above-mentioned birefringent material may be orthogonal to the optical axis direction of the irradiation optical system.
- the component of the laser beam emitted from the light source is separated into the ordinary light and the extraordinary light reliably and efficiently because the crystal axis direction of the lens made of the birefringent material is orthogonal to the optical axis direction of the irradiation optical system. can do.
- an optical quartz is preferable as a raw material of the said birefringent material.
- the optical quartz crystal As described above, by using the optical quartz crystal as the material of the birefringent material, it is possible to exhibit high light resistance to the laser beam emitted from the light source while forming the above-mentioned plurality of beam waists, and to obtain a wide wavelength High transmittance to the range can be exhibited.
- the laser irradiation apparatus includes relative movement means for moving the position of the object relative to the irradiation optical system in two directions orthogonal to each other in a plane perpendicular to the optical axis of the irradiation optical system and relatively moving in the optical axis direction. It is good. As a result, continuous grooving and drilling on an object can be rapidly performed, and the depth of focus of a processing site can be adjusted, and the precision and yield of cutting of ceramics and the like can be improved.
- the irradiation optical system includes a half-wave plate rotatable about an optical axis, and the half-wave plate is disposed in front of a lens made of the birefringent material as a reference with respect to the traveling direction of the laser beam. Good to be done. Thereby, the intensity ratio of a plurality of beam waists can be changed continuously and easily.
- the irradiation optical system may include a quarter-wave plate, and the quarter-wave plate may be disposed behind a lens made of the birefringent material based on the traveling direction of the laser beam.
- the processing characteristics can be stabilized by converting the linear polarization of the laser beam into circular polarization and removing the influence of the polarization from the plurality of beam waists.
- a wavelength of the said laser beam 200 nm or more and 11 micrometers or less are preferable.
- the wavelength of this laser beam in the above-mentioned range, it is possible to realize a laser output mainly corresponding to laser processing of ceramics and the like, and to improve the reliability and efficiency of the laser processing of ceramics and the like.
- the oscillation means of the laser beam may be continuous oscillation or pulse oscillation. As described above, by setting the oscillation means of the laser beam to continuous oscillation or pulse oscillation, it is possible to adjust the processing content according to the type and the property of the processing material, and processing of various variations can be realized.
- another invention made in order to solve the said subject is the laser processing method which is using the said laser irradiation apparatus.
- the laser processing method By adopting such a laser processing method, it is possible to form fine grooves and holes in a substrate such as ceramics and to form the grooves and holes deep.
- the distance between the plurality of beam waists formed by the laser irradiation apparatus may be adjusted to 0.5 to 10 times the Rayleigh length.
- optical axis of the irradiation optical system means the optical axis of the lens or the irradiation target portion to be compared with the optical axis.
- Beam waist means the focused spot of the focused laser beam.
- the laser irradiation apparatus and the laser processing method of the present invention can form a plurality of beam waists reliably and easily, and as a result, it is possible to quickly process a fine object with a large focal depth. Can be realized.
- the positions of the plurality of beam waists it is possible to realize optimal processing according to the type of processing target (for example, ceramics, glass, sapphire, etc.).
- the drilling processing of a substrate such as a green sheet, it is possible to realize fine processing with less taper.
- the schematic block diagram which shows the laser irradiation apparatus which concerns on one Embodiment of this invention A schematic configuration diagram for explaining a mechanism in which the laser irradiation apparatus of FIG. 1 forms two beam waists
- the schematic block diagram which shows the laser irradiation apparatus which concerns on embodiment different from the laser irradiation apparatus of FIG. When changing the lens distance (relative movement distance of the birefringent convex lens) of the beam expander of the laser irradiation apparatus of FIG. 3, the calculation result of the change in the distance between the two beam waists and the diameter of the beam waist is calculated.
- the laser irradiation apparatus of FIG. 1 mainly includes a light source 1, a stage 2 and an irradiation optical system 3.
- the light source 1 emits a laser beam P.
- the type of the light source 1 is not particularly limited, and examples thereof include a gas laser such as a CO 2 laser, a solid laser such as an Nd: YAG laser, and an ultrashort pulse laser such as a femtosecond laser.
- a gas laser such as a CO 2 laser
- a solid laser such as an Nd: YAG laser
- an ultrashort pulse laser such as a femtosecond laser.
- an Nd: YAG laser is preferable in order to process a fine and large focal depth on a circuit board or the like in which a hard and brittle material such as a ceramic material is used.
- an ultrashort pulse laser since self focusing or filamentation occurs at the light collecting site, the thermal influence on the periphery of the processing site can be suppressed, and a larger focal depth can be realized.
- the wavelength of the laser beam of the light source 1 is preferably 200 nm or more and 11 ⁇ m or less, and particularly preferably 240 nm or more and 1600 nm or less.
- oscillation means of the laser beam of the light source continuous oscillation or pulse oscillation is preferably employed.
- continuous oscillation By setting the oscillation means of this laser beam to continuous oscillation, it is possible to continuously oscillate a constant laser output.
- pulse oscillation By using pulse oscillation, it is possible to obtain a laser pulse having high peak power, and it is possible to perform more efficient processing with less heat affected layer. As a result, it is possible to realize optimal processing according to the type and nature of the processing material.
- Stage 2 is for setting an object Q.
- the specific structure of the stage 2 is not particularly limited, and, for example, a transparent plate that transmits a laser beam, or a table provided with an opening such as a slit at an irradiation position of the laser beam is adopted.
- the stage 2 adds the position of the object Q with respect to the irradiation optical system 3 in two orthogonal directions (X-axis direction, Y-axis direction) in a plane perpendicular to the optical axis R of the irradiation optical system 3.
- a relative moving means is provided to move relatively in the direction (Z-axis direction). By such relative movement means, continuous grooving and drilling on the object Q can be rapidly performed, and the depth of focus of the processing site can be adjusted. In particular, when cutting a fine substrate, the processing accuracy can be improved and the yield can be improved.
- the specific structure of the moving means of the stage 2 is not particularly limited, and known means may be employed.
- the irradiation optical system 3 guides and condenses the laser beam P emitted from the light source 1 to the object Q.
- the irradiation optical system 3 includes a half wave plate 4, a beam expander 5, a mirror 6, a birefringence lens 7, a quarter wave plate 8, and a condenser lens 9 in the traveling direction of the laser beam P.
- the half-wave plate 4 is disposed in front of the birefringent lens 7 on the basis of the traveling direction of the laser beam P, and rotates the electric field vector of the laser beam. This mechanism will be described in detail with reference to FIG. 2.
- the angle between the slow axis of the half wave plate 4 and the electric field vector (E y ) of the incident laser light is ⁇
- the laser light P is transmitted through the half wave plate 4
- the transmitted electric field vector rotates by 2 ⁇ .
- the half-wave plate 4 is rotatable about the optical axis R of the illumination optical system 3, in accordance with the rotation angle of the slow and axis perpendicular normal light component E x, abnormal light orthogonal thereto
- the intensity ratio with component E y can be varied.
- the means for rotating the half-wave plate 4 is not particularly limited, and any known means may be employed.
- the beam expander 5 has a concave lens 10 which is a first lens and a convex lens 11 which is a second lens in the traveling direction of the laser beam P in order.
- the concave lens 10 is a plano-concave lens, and is disposed such that the laser beam P is incident on the concave surface, and enlarges the laser beam P emitted from the light source 1.
- the convex lens 11 is a plano-convex lens, and is disposed so that the laser beam P is incident on the convex surface, and converts the laser beam P expanded by the concave lens 10 into a parallel light flux.
- a biconcave lens, a concave meniscus lens and the like can be mentioned.
- a biconvex lens, a convex meniscus lens and the like can be mentioned besides the plano-convex lens.
- the mirror 6 guides the laser beam P transmitted through the beam expander 5 to the condensing lens 9. By changing the reflection angle of the laser beam P using this mirror 6, the traveling direction of the laser beam P can be easily adjusted.
- the means for adjusting the reflection angle of the laser beam P using the mirror 6 is not particularly limited, and any known means may be employed.
- the birefringent lens 7 is a single lens, and a birefringent material is used as its material.
- the birefringent lens 7 separates the incident laser beam P into two electric field components and forms two beam waists. The mechanism will be described in detail with reference to FIG. 2.
- the laser beam P emitted from the light source 1 is initially linearly polarized in the direction of the electric field, and a retardation is generated by transmitting the half wavelength plate 4. Thereafter, the laser beam P incident on the birefringent lens 7, a crystal axis S perpendicular component E x, is separated into the component E y perpendicular thereto, and transmitted as the component E x ordinary 12, component E y is It is transmitted as extraordinary light 13.
- birefringent lens 7 examples include a biconvex lens, a plano-convex lens, a convex meniscus lens, a biconcave lens, a plano-concave lens, and a concave meniscus lens.
- the birefringent lens 7 has two different refractive indexes, and by utilizing these refractive index differences, the incident laser beam P is separated into the ordinary light 12 and the extraordinary light 13 to form different focal points.
- Have the characteristic of Such characteristics determine the waist diameter and waist spacing at the two beam waists. Therefore, for example, in the irradiation optical system, various birefringent lenses having different characteristics are suitably adopted, and by adjusting the waist diameter and the waist interval at the two beam waists, the lens is optimally processed according to the properties of the processing material It can also be realized by a simple means of exchange.
- the direction of the crystal axis S of the birefringent lens 7 may be orthogonal to the direction of the optical axis R of the illumination optical system. As described above, when the direction of the crystal axis S of the birefringence lens 7 is orthogonal to the direction of the optical axis R of the irradiation optical system, the direction of the crystal axis S coincides with the direction of the electric field.
- the components of the laser beam can be separated into the ordinary light and the extraordinary light with certainty and efficiency.
- the material of the birefringent lens 7 is not particularly limited.
- optical quartz, sapphire, calcite or the like is used, and among them, optical quartz is preferably employed.
- optical quartz As a material of the birefringent lens 7, it is possible to exhibit high light resistance to a laser beam and to exhibit high transmittance to a wide wavelength range.
- Birefringent lens 7 for such an optical crystal and materials the refractive index with respect to a typical laser wavelength (n o: a refractive index of ordinary light, n e: refractive index of extraordinary light) shown in the following Table 1 .
- Table 1 in the birefringent lens 7 made of optical quartz, it is understood that the value of n e is larger than the value of n o and the extraordinary light corresponds to the short focus.
- Table 2 in the fundamental wave (1064 nm) of the Nd: YAG laser, the value of f e is smaller than the value of f o , so it can be understood that the extraordinary light corresponds to the short focus.
- the quarter wavelength plate 8 is disposed after the birefringent lens 7 with reference to the traveling direction of the laser beam P.
- This quarter-wave plate 8 converts the linearly polarized light of the laser beam P transmitted through the birefringent lens 7 into circularly polarized light to remove the influence of the polarization and stabilize processing characteristics, thereby achieving a deep focal depth. It can be realized reliably and efficiently.
- the condensing lens 9 is a single lens or a combination lens whose optical aberration is corrected with respect to the wavelength of the laser beam to be used, and condenses the laser beam P guided from the mirror 6 onto the object Y It is Two beam waists are collected by the condensing lens 9 by condensing the ordinary light 12 and the extraordinary light 13 of the laser beam P transmitted through the 1 ⁇ 4 wavelength plate 8 at different positions on the optical axis R of the irradiation optical system. Can be formed.
- Examples of the type of lens constituting the focusing lens 9 include biconvex lenses, planoconvex lenses, convex meniscus lenses, biconcave lenses, planoconcave lenses, concave meniscus lenses, and the like.
- the beam waist diameter 2 ⁇ o formed by the laser irradiation apparatus is calculated by the following formula 1 where f is the focal length of the condensing lens, D is the diameter of the beam incident on the condensing lens, and ⁇ is the laser wavelength.
- f the focal length of the condensing lens
- D the diameter of the beam incident on the condensing lens
- ⁇ the laser wavelength
- the Rayleigh length d f of the laser beam emitted by the above-mentioned laser irradiation apparatus is calculated by the following formula 2 assuming that the radius of the beam waist is ⁇ o and the laser wavelength is ⁇ .
- the Rayleigh length d f is closely related to the radius ⁇ o of the beam waist according to the following equation 2, and in order to realize a beam waist with a large focal depth (long Rayleigh length), the beam is constant when the wavelength ⁇ is constant It is necessary to increase the radius ⁇ o of the waist.
- the radius ⁇ o of the beam waist becomes large, fine processing becomes difficult.
- the laser irradiation apparatus of FIG. 3 mainly includes a light source 1, a stage 2, and an irradiation optical system 14.
- the light source 1 and the stage 2 are the same as in the case of the laser irradiation apparatus of FIG.
- the irradiation optical system 14 guides and condenses the laser beam P emitted from the light source to the object Q.
- the irradiation optical system 14 includes a half wave plate 4, a beam expander 15, a quarter wave plate 8, a mirror 6, and a focusing lens 9 in the traveling direction of the laser beam P.
- the laser beam P, the object Q, the half wave plate 4, the quarter wave plate 8, the mirror 6 and the condenser lens 9 are the same as in the case of the laser irradiation apparatus of FIG. I omit explanation.
- the beam expander 15 has a concave lens 16 as a first lens and a convex lens 17 as a second lens in the traveling direction of the laser beam P in order of travel.
- a birefringent material is used as a material of the convex lens 17.
- the beam expander 15 is configured such that the distance between the concave lens 16 and the convex lens 17 can be changed. Thereby, the waist interval can be easily adjusted without largely changing the diameters of the two beam waists emitted from the irradiation optical system 14, and the optimum processing according to the processing material can be realized by an easy means. Can.
- the distance between the concave lens 16 and the convex lens 17 can be adjusted by moving one or both of the concave lens 16 and the convex lens 17 in the direction of the optical axis R of the irradiation optical system 14.
- the means for moving the lens is not particularly limited, and any known means may be employed.
- FIG. 4 is a graph showing the results of calculation of how the distance between the two beam waists and the diameter (ordinary light) of the beam waist change when the distance between the concave lens 16 and the convex lens 17 is changed.
- the distance between the concave lens 16 and the convex lens 17 is indicated by the distance (relative movement distance) in which the convex lens 17 is moved relative to the concave lens 16.
- the magnification of the beam expander 15 and the focal length of the condenser lens 9 are selected, and the final beam waist diameter is set to be about 5 ⁇ m. As shown in FIG.
- the beam expander 15 can change the distance between the beam waists without significantly changing the beam waist diameter, so that the laser processing with a small diameter and a large depth of focus can be performed by adapting to the properties of the processing material. It can be realized.
- the laser irradiation apparatus of FIG. 5 mainly includes a light source 1, a stage 2 and an irradiation optical system 18.
- the light source 1 and the stage 2 are the same as in the case of the laser irradiation apparatus of FIG.
- the irradiation optical system 18 guides and condenses the laser beam P emitted from the light source 1 to the object Q.
- the irradiation optical system 18 includes a beam expander 5, a mirror 6, and a condenser lens 19 in the traveling direction of the laser beam P.
- the laser beam P, the object Q, the beam expander 5 and the mirror 6 are the same as in the case of the laser irradiation apparatus of FIG.
- the condensing lens 19 is for condensing the laser beam P guided from the mirror 6 onto the object, and a birefringent material is used as its material.
- the condenser lens 19 has a function of condensing the laser beam P, and also has a function of separating the laser beam P into an ordinary light 12 and an extraordinary light 13 to form two beam waists. Therefore, two beam waists can be easily formed using one lens having light collecting property and birefringence, without separately preparing and arranging a lens using a birefringent material as a material, The irradiation optical system can be simplified and the cost can be reduced.
- a laser processing method using the laser irradiation apparatus of FIG. 1, the laser irradiation apparatus of FIG. 3, and the laser irradiation apparatus of FIG.
- a laser processing method for example, a plurality of beam waists can be formed at intervals at which cracks are induced in the object. Further, by arranging one beam waist in the vicinity of the surface of the object and arranging the other beam waist inside the object, it is possible to induce a processing crack extending from the surface of the object to the inside.
- an interval between a plurality of beam waists formed by the laser irradiation apparatus can be adjusted to 0.5 to 10 times the Rayleigh length.
- Such adjustment can avoid the influence of defocus of the laser beam, and can achieve a large depth of focus while maintaining a small beam waist diameter.
- the specific adjustment means is particularly limited. Instead, known means are employed.
- the laser irradiation apparatus of this invention and the laser processing method using the same are not limited to the said embodiment.
- the condensing lens 19 of the laser irradiation apparatus of FIG. 5 can be easily adjusted in position of the two beam waists by providing a means for moving relatively in the direction of the optical axis R of the irradiation optical system 18. It is possible to realize a simpler and simpler irradiation optical system.
- the upper side and the lower side of the beam waist can be obtained by not arranging the quarter wavelength plate in the irradiation optical system.
- the polarization directions with the side are orthogonal to each other, the processing groove width can be increased, and the depth of focus can be reduced.
- Example 1 and Example 2 ⁇ Description of experimental system> At least one beam waist is placed inside the borosilicate glass where it is easy to observe processing marks using an irradiation optical system equipped with at least a light source, a beam expander, a half wave plate, and a condenser lens, It formed. After that, a cross-sectional observation image orthogonal to the processed groove was taken.
- the beam expander used in Examples 1 and 2 includes a concave lens and a convex lens having birefringence, and is configured such that the distance between both lenses can be changed.
- the distance between the two beam waists formed on the optical axis can be changed by changing the distance between the two lenses (Lm).
- the half-wave plate used in Examples 1 and 2 is rotated about the optical axis of the irradiation optical system, the laser power distribution in the two focused spots can be changed.
- Comparative Example 1 The irradiation optical system used in Comparative Example 1 has a standard configuration provided with at least a light source, a beam expander, and a condenser lens, and the convex lens of the beam expander does not have birefringence, and has a half wavelength
- the board is not included either.
- Example 1 a processed groove having a length of about 100 ⁇ m was formed in the optical axis direction (the thickness direction of the borosilicate glass) of the irradiation optical system (FIG. 6).
- the two waist spacings were about 190 ⁇ m
- the lengths of the processed grooves by the individual waists were about 60 ⁇ m and about 70 ⁇ m (FIG. 7). Since the lengths (about 60 ⁇ m and about 70 ⁇ m) of the two processed grooves in Example 1 are shorter than the lengths (about 100 ⁇ m) when processed by one spot in Comparative Example 1, one spot in Example 1 It is considered that the laser power to be concentrated on is separated into two.
- Example 2 in order to form a long processed groove in the thickness direction of borosilicate glass, the distance between the convex lens and the convex lens having birefringence is set small in order to reduce the distance between the two waists. Specifically, the expander lens interval Lm is reduced by 10 mm from the time of processing in Example 1, and as a result, processed grooves by both waists are connected, and a processed groove having a maximum length of 180 ⁇ m is formed (see FIG. 8). Thus, it was found that the length (about 180 ⁇ m) of the processed groove in Example 2 was longer than the length (about 100 ⁇ m) of the processed groove in Comparative Example 1.
- Example 2 when forming a long machined groove with one spot, high laser power is required, but even if the same deep machined groove as in Example 2 is formed, the machined groove width is increased at the same time. It is known that a much wider width of altered process site is formed. Accordingly, in Example 2, it is considered that groove processing with a large focal depth can be realized while minimizing the processing deterioration range in the groove width direction with a small laser power.
- Example 2 [Example 3 and Example 4] ⁇ Description of experimental system> The experimental system is the same as that of Example 1 and Example 2 in Experiment 1 above.
- the expander lens interval Lm was fixed, and the half-wave plate was rotated about the optical axis of the irradiation optical system to change the power distribution of the two waists.
- Example 3 all the laser power was concentrated on the lower waist, and processing was performed as one spot (FIG. 9). On the other hand, in Example 4, the half-wave plate was rotated to divide the laser power component into the upper waist: maximum 30% and the lower waist: maximum 70% (FIG. 10). In Example 3, only one processed portion was formed inside the borosilicate glass, but when the laser power was divided into 2 waists in Example 4, processed portions were also formed near the surface.
- Example 3 and Example 4 two waists are formed in the optical axis direction at an arbitrary interval, and in addition to the original groove length of the machined portion by each waist, it occurs between the individual machined portions It is considered that by generating a crack using strain stress, it is possible to form a processed groove with a greater depth of focus.
- Example 3 Example 5 and Comparative Example 2 ⁇ Description of experimental system>
- Experiment 3 examined about realizing processing with a deep depth of focus while maintaining a small beam waist diameter.
- the configuration of the experimental system in Experiment 3 is as shown in FIG. 1, and the beam expander is a standard lens configuration in which a concave lens and a convex lens are arranged, and a convex lens having birefringence is a condensing lens together with a 1 ⁇ 4 wavelength plate. It is placed just before the In addition, although the beam waist distance was set so that the Rayleigh length of both waists may overlap, this distance is not necessarily optimal.
- Example 5 With such a configuration, in Comparative Example 2, groove processing was performed in one spot in which all the laser power was concentrated on the lower waist. Moreover, in Example 5, the groove processing in the case where laser power was equally divided into upper and lower spots by 2 spots was implemented. Then, in Example 5 and Comparative Example 2, the correlation between the defocus amount (the relative position of the focus) and the groove depth (the scribe depth ratio) was examined (FIG. 11).
- Example 5 It was found from FIG. 11 that the variation in scribe depth in Example 5 is smaller than that in Comparative Example 2 with respect to the defocus from the focal position where the maximum scribe depth is realized. Therefore, in Example 5, resistance to defocus was observed.
- the laser irradiation apparatus and the laser processing method using the same according to the present invention are fine and have a large focal depth according to the processing characteristics and processing quality of the processing object using a simple and simple irradiation optical system. Machining grooves and holes can be easily formed. Therefore, the operation can be simplified, the apparatus can be simplified, and the cost can be reduced, and can be widely used in the field of laser processing.
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Abstract
Description
レーザー光線を出射する光源と、
1又は複数のレンズを有し、光源から出射されるレーザー光線を対象物に導光及び集光する照射光学系と
を備えるレーザー照射装置であって、
上記照射光学系の少なくとも一つのレンズの素材として、複屈折材料が用いられていることを特徴とする。
[実施例1及び実施例2]
〈実験系の説明〉
少なくとも光源、ビームエキスパンダ、1/2波長板、集光レンズを備える照射光学系を用いて、加工痕跡の観察しやすいホウ珪酸ガラスの内部に1又は2つのビームウエストを配置し、加工溝を形成した。その後、この加工溝と直交する断面観察画像を撮影した。
実施例1及び2で使用するビームエキスパンダは、凹レンズと複屈折性を有する凸レンズとを備え、両レンズ間隔を変化可能に構成されている。この両レンズ間隔(Lm)を変化させることで、光軸上に形成される2つのビームウエストの間隔を変化させることができる。また、実施例1及び2で使用する1/2波長板を照射光学系の光軸回りに回転させると、2つの集光スポットにおけるレーザーパワー配分を変化させることができる。
比較例1で使用する照射光学系は、少なくとも光源、ビームエキスパンダ、集光レンズを備える標準的な構成であり、ビームエキスパンダの凸レンズは複屈折性を有するものではなく、また1/2波長板も含まれていない。
加工条件及び実験結果を下記表3、図6~図8に示す。
[実施例3及び実施例4]
〈実験系の説明〉
実験系は、上記実験1での実施例1及び実施例2の場合と同様である。実験2では、エキスパンダレンズ間隔Lmを一定とし、1/2波長板を照射光学系の光軸回りに回転させて、2つのウエストのパワー配分を変化させた。
加工条件及び実験結果を下記表4、図9、図10に示す。
[実施例5及び比較例2]
〈実験系の説明〉
実験3では、小さなビームウエスト径を維持しながら、焦点深度の深い加工を実現することについて検討した。実験3における実験系の構成は、図1に示すとおりであり、ビームエキスパンダは凹レンズ及び凸レンズを配置した標準的なレンズ構成とし、複屈折性を有する凸レンズは1/4波長板と共に集光レンズの直前に配置している。なお、ビームウエスト間隔は、両ウエストのレイリー長が重なるように設定したが、必ずしもこの間隔が最適というわけではない。
加工条件及び実験結果を下記表5、図11に示す。実施例5におけるウエスト径、レイリー長及びパワー密度は、2つのビームウエスト間でほぼ同じ値を示した。
2 ステージ
3 照射光学系
4 1/2波長板
5 ビームエキスパンダ
6 ミラー
7 複屈折レンズ
8 1/4波長板
9 集光レンズ
10 凹レンズ
11 凸レンズ
12 常光
13 異常光
14 照射光学系
15 ビームエキスパンダ
16 凹レンズ
17 複屈折性凸レンズ
18 照射光学系
19 複屈折性集光レンズ
P レーザー光線
Q 対象物
R 光軸
S 結晶軸
Claims (12)
- レーザー光線を出射する光源と、
1又は複数のレンズを有し、光源から出射されるレーザー光線を対象物に導光及び集光する照射光学系と
を備えるレーザー照射装置であって、
上記照射光学系の少なくとも一つのレンズの素材として、複屈折材料が用いられていることを特徴とするレーザー照射装置。 - 上記照射光学系が、凹レンズ又は凸レンズである第1レンズと、凸レンズである第2レンズとをレーザー光線の進行方向順に有し、この第1レンズ及び第2レンズの間隔を変化可能に構成するビームエキスパンダを含み、
上記第1レンズ及び/又は第2レンズの素材として、複屈折材料が用いられている請求項1に記載のレーザー照射装置。 - 上記照射光学系が、レーザー光線の進行方向最後に配設される集光レンズを含み、
この集光レンズの素材として、複屈折材料が用いられている請求項1に記載のレーザー照射装置。 - 上記複屈折材料を素材とするレンズの結晶軸方向が、照射光学系の光軸方向と直交する請求項1に記載のレーザー照射装置。
- 上記複屈折材料が光学水晶である請求項1に記載のレーザー照射装置。
- 上記照射光学系に対する対象物の位置を、照射光学系の光軸と垂直な面内における直交2方向に加え、光軸方向にも相対的に移動させる相対的移動手段を備える請求項1に記載のレーザー照射装置。
- 上記照射光学系が、光軸を中心に回転可能な1/2波長板を含み、
この1/2波長板が、レーザー光線の進行方向を基準として上記複屈折材料を素材とするレンズの前に配設される請求項1に記載のレーザー照射装置。 - 上記照射光学系が1/4波長板を含み、
この1/4波長板が、レーザー光線の進行方向を基準として上記複屈折材料を素材とするレンズの後に配設される請求項1に記載のレーザー照射装置。 - 上記レーザー光線の波長が200nm以上11μm以下である請求項1に記載のレーザー照射装置。
- 上記レーザー光線の発振手段が連続発振又はパルス発振である請求項1に記載のレーザー照射装置。
- 請求項1に記載のレーザー照射装置を用いているレーザー加工方法。
- 上記レーザー照射装置により形成される複数のビームウエストの間隔を、レイリー長の0.5倍から10倍に調節する請求項11に記載のレーザー加工方法。
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JP2006525874A (ja) | 2003-05-30 | 2006-11-16 | エグシル テクノロジー リミテッド | 2焦点への光ビームの集束 |
JP2006192503A (ja) | 2005-01-12 | 2006-07-27 | L'air Liquide Sa Pour L'etude & L'exploitation Des Procede S Georges Claude | 二重焦点レンズを用いる、薄い金属被加工物のレーザー切断 |
JP2007000931A (ja) * | 2005-05-24 | 2007-01-11 | Disco Abrasive Syst Ltd | レーザー加工装置 |
JP2007290932A (ja) | 2006-04-27 | 2007-11-08 | Seiko Epson Corp | スクライブ装置ならびにスクライブ方法 |
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DE102014215302B4 (de) * | 2013-08-05 | 2025-07-17 | Disco Corporation | Laserbearbeitungsvorrichtung |
WO2015029466A1 (ja) * | 2013-08-28 | 2015-03-05 | 三菱重工業株式会社 | レーザ加工装置 |
EP3025819A4 (en) * | 2013-08-28 | 2016-09-28 | Mitsubishi Heavy Ind Ltd | LASER PROCESSING DEVICE |
CN113204122A (zh) * | 2021-06-08 | 2021-08-03 | 富通尼激光科技(东莞)有限公司 | 一种双波长大倍率连续变倍激光扩束镜 |
Also Published As
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JP2011005537A (ja) | 2011-01-13 |
US8988777B2 (en) | 2015-03-24 |
TWI392552B (zh) | 2013-04-11 |
KR20120000049A (ko) | 2012-01-03 |
US20120012758A1 (en) | 2012-01-19 |
CN102348530B (zh) | 2015-04-29 |
EP2450144B1 (en) | 2015-05-20 |
JP4611431B1 (ja) | 2011-01-12 |
CN102348530A (zh) | 2012-02-08 |
EP2450144A4 (en) | 2013-06-26 |
TW201100189A (en) | 2011-01-01 |
KR101167242B1 (ko) | 2012-07-23 |
EP2450144A1 (en) | 2012-05-09 |
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