WO2004072698A1 - マイクロレンズアレイ一体型レンズ - Google Patents
マイクロレンズアレイ一体型レンズ Download PDFInfo
- Publication number
- WO2004072698A1 WO2004072698A1 PCT/JP2004/001697 JP2004001697W WO2004072698A1 WO 2004072698 A1 WO2004072698 A1 WO 2004072698A1 JP 2004001697 W JP2004001697 W JP 2004001697W WO 2004072698 A1 WO2004072698 A1 WO 2004072698A1
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- WO
- WIPO (PCT)
- Prior art keywords
- lens
- array
- microlens
- axis
- integrated
- Prior art date
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
- G02B27/0961—Lens arrays
-
- 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
-
- 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
- B23K26/0608—Shaping the laser beam, e.g. by masks or multi-focusing by a combination of beams in the same heat affected zone [HAZ]
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
-
- 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
-
- 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 lens having an integrated lens array with a micro aperture for condensing a beam from a light source such as a semiconductor laser array.
- the lens with an integrated microphone aperture lens array of the present invention can be used for a laser processing head or the like.
- Drilling and cutting in the manufacturing industry have an extremely strong demand for ultra-fine writing, but conventional machining has the following processing limits.
- Drilling and thinning of thin metal plates In drilling, it is impossible to make a diameter of 0.2 mm or less by drilling. ⁇ Etching requires a mask, and it is difficult to machine straight holes and slits. It is.
- the conventional processing method does not allow a tool with a line width of 200 m or less.
- the high-power semiconductor laser array itself developed for pumping YAG lasers can be directly used as the light source for laser processing, energy-saving, inexpensive, compact, and high-performance laser processing machines, and the currently widely used
- a compact laser-processed head that can be mounted on a center can be developed. Furthermore, it can be used in the market for single excitation of YAG laser in the future.
- a high-power semiconductor laser array has a power capability of several 10 W class, but its output beam spreads to several 10 degrees, so it is necessary to focus on a small spot with high energy required for processing. Was extremely difficult.
- a power supply for laser processing using a microlens array has been proposed, but a type in which a condensing lens is separately provided (see, for example, Japanese Patent Application Laid-Open No. 2002-264652, 26 paragraphs, Fig. 8, etc.)). Disclosure of the invention
- the present invention has been made in view of the above situation.
- an array of microlenses with a beam shaping function is realized to realize high-efficiency coupling of a semiconductor laser, and to provide an optical element that focuses the shaped laser beam to a sufficiently small spot diameter by a lens.
- the micro lens does not specify an absolute size, but means that the micro lens is relatively small as compared with the lens on the light-collecting surface.
- the lens with integrated microphone aperture lens array includes a microlens array in which microlenses for receiving beams from individual light sources are arranged on one surface, and the shaped beam is condensed or parallelized on the other surface. It has a shape to be converted. Therefore, highly efficient coupling of the semiconductor laser can be realized, and the laser beam can be focused to a sufficiently small spot diameter by the lens.
- the surface of the microlens is non-circular in any in-plane cross-section including the optical axis.
- the surface of the microlens is represented by a mathematical expression including a term representing a non-rotationally symmetric aspherical aperture file.
- the laser beam shape can be shaped mainly by the non-rotationally symmetric aspherical profile, and the aberrations can be minimized by the collection term.
- the optical axis of the micro lens coincides with the Z axis of a three-axis orthogonal XYZ coordinate system
- c x is the curvature of the center of the curve of the XZ cut surface
- C y is YZ switching Kx and ky are coefficients representing the shape of the curve
- AR, BR, CR, DR, AP, BP, CP and DP are correction coefficients (constants).
- c x is the curvature of the center of the curve of the XZ cut surface
- c y is YZ Kx
- ky are coefficients representing the shape of the curve, and assuming that the correction coefficients A i and B; are constants
- k is a constant that determines the shape of the quadratic curve
- c is the central curvature
- the other surface is represented by an aspherical surface.
- the other surface has an optical axis that is orthogonal to three axes.
- k is a constant that determines the shape of the quadratic curve
- c is the central curvature
- A is the correction coefficient.
- the shaped laser beam can be focused to a sufficiently small spot diameter by the lens.
- the other surface forms a cylindrical lens for condensing or collimating a beam. Therefore, the crystal rod can be irradiated with the excitation light to extract the stimulated emission light.
- FIG. 1 shows an embodiment of a microlens array integrated lens according to the present invention.
- FIG. 2 is a diagram showing a beam shaping optical element.
- FIG. 3 is a diagram showing a curved surface of the beam shaping optical element.
- FIG. 4 is a diagram showing an optical path of a beam shaping optical element.
- FIG. 5 is a diagram showing a shunt switching basic circuit.
- FIG. 6 shows the shape of a microlens array-integrated lens including an emission surface.
- FIG. 7 is a view showing a method of defining a light beam of the microlens array integrated lens of the present invention.
- FIG. 8 is a diagram showing an embodiment of a lens with an integrated microphone aperture lens array of the present invention.
- FIG. 9 is a diagram showing a relationship between a semiconductor laser and a microlens array.
- FIG. 10 is a diagram showing a YZ section of a type 1 optical path.
- FIG. 11 is a diagram showing an XZ cross section of a type 1 optical path.
- FIG. 12 is a three-dimensional view of a type 1 optical path.
- FIG. 13 is a diagram showing a cross section of a spot including a type 1 peak in the Y and X directions.
- FIG. 14 is a diagram showing a YZ section of a type 2 optical path.
- FIG. 15 is a diagram showing an XZ cross section of a type 2 optical path.
- FIG. 16 is a three-dimensional view of a type 2 optical path.
- FIG. 17 is a diagram showing a spot cross section in the Y direction and the X direction including a type 2 peak.
- FIG. 18 is a diagram showing a YZ section of a type 3 optical path.
- FIG. 19 is a diagram showing an XZ cross section of a type 3 optical path.
- FIG. 20 is a three-dimensional view of a type 3 optical path.
- FIG. 21 is a diagram showing a spot cross section in the Y direction and the X direction including a type 3 peak.
- FIG. 22 is a diagram showing a YZ section of a type 4 optical path.
- FIG. 23 is a diagram showing an XZ section of a type 4 optical path.
- FIG. 24 is a three-dimensional view of a type 4 optical path.
- FIG. 25 is a diagram showing a cross section of a spot including a type 4 peak in the Y direction and the X direction.
- FIG. 26 is a diagram showing solid-state laser oscillation due to bombing of a semiconductor laser array.
- FIG. 1 and FIG. 8 show the configuration of a lens with an integrated microphone aperture lens array according to the present invention.
- an array with microlenses with a beam shaping function is provided for each laser of the laser diode array.
- the exit surface of the microlens array integrated lens is designed to focus the shaped beam.
- the laser diode array is connected to an ultrashort pulse generation circuit.
- the ultrashort pulse generation circuit uses the energy efficient shunt switching circuit shown in Fig.5. That is, by switching the current i flowing through the inductance L by the power M0SFET, a large current is instantaneously passed through the semiconductor laser LD, and the short pulse compression operation is performed electrically.
- the surface of the microlens is determined based on the following equation with the optical axis as the Z axis. c x x + c v y
- c x is the curvature of the center of the curve of the XZ cut surface
- c x l / Rx
- c y is the center of curvature of the curve of YZ cut surface is a
- c y lZRy.
- kx and ky are coefficients representing the shape of the curved line.
- the second and subsequent terms are correction terms representing deviations from the curved surface.
- AR, BR, CR, DR, AP, BP, CP and DP are correction factors (constants).
- ⁇ it is determined by the following equation.
- c x and c y are the curvature of the X-axis and Y-axis direction of the surface, respectively, k x Contact and k y and the correction coefficients A i and B i are constants.
- a function such as changing the beam shape can be mainly achieved.
- changing the beam shape means changing a beam emitted from a semiconductor laser having an elliptical energy distribution into a beam having an approximately circular energy distribution.
- functions such as minimizing wavefront aberration can be achieved.
- the use of super-resolution in a microlens can reduce the beam spot diameter and increase the depth of focus.
- FIG. 2 is a diagram illustrating an example of a beam shaping optical element.
- FIG. 3 is a diagram illustrating an example of a curved surface of the beam shaping optical element.
- FIG. 4 is a diagram illustrating an example of an optical path of a beam shaping optical element.
- Table 1 shows the general relationship between the lens diameter, the focal length, and the lZe 2 spot diameter. In Table 1, bre and re indicate intermediate parameters. From Table 1, although depending on the lens diameter and the focal length, spot diameters less than 10 ⁇ are also sufficiently possible. table 1
- FIG. 6 shows the shape of the microlens array-integrated lens including the exit surface.
- the S 2 plane is, for example, an optical axis symmetric rotation plane obtained by rotating the following quadratic curve around the optical axis.
- the optical axis is represented by Z
- the coordinates of a plane perpendicular to the optical axis are represented by xy.
- k is a constant that determines the shape of the quadratic curve
- c is the central curvature.
- A is a correction coefficient.
- h 2 + For example, a coefficient up to the fourth order is used as the correction coefficient A.
- Table 2 shows the design specifications of the optical system in Fig. 6. The circled numbers in the table correspond to those in Figure 6.
- LD represents a laser diode as a light source.
- Fig. 7 explains the method of defining light rays.
- the S2 surface is decentered, and the principal ray position (condensing position) on the image plane is changed by the same amount as the S2 surface is decentered.
- Table 3 shows the resulting relationship between the surface eccentricity and the focusing position.
- a system that irradiates a crystal aperture with reflected light to extract stimulated emission light can be considered.
- a cylindrical lens is arranged on the other surface of the lens array surface, and a focused or collimated light beam is made incident on the crystal aperture.
- LDs semiconductor lasers
- Table 4 An array of 25 semiconductor lasers (LDs) shown in Table 4 is used.
- the light emitted from the semiconductor laser is assumed to have a Gaussian distribution, and the numerical aperture ⁇ is specified so as to capture the ideal effective Gaussian energy of 86.5%.
- Table 4
- a coordinate system is created as shown in FIG. 9, and a lens array element is provided on the surface on the semiconductor laser side so as to correspond to each semiconductor laser arranged in an array.
- the optical system is designed so that the chief rays emitted from each semiconductor laser with the numerical aperture NA shown in Table 1 converge at one point on the image plane, and the wavefront aberration is minimized. Design is performed using optical design software.
- Intensity magnification is defined as a lens evaluation index. Emitting from a semiconductor laser The light beam is captured with an ideal effective Gaussian energy of 86.5%, and the intensity magnification when condensed by an ideal lens without wavefront aberration is 1. Therefore, the effective Gaussian energy (%) is Divide by 86.5 (%) and multiply by the Strehl ratio to obtain the intensity magnification, where the Strehl ratio is the ratio of the intensity resulting from the wavefront aberration to the intensity of the ideal lens. .
- the intensity distribution of each semiconductor laser is calculated separately, and the total intensity distribution is calculated by calculating the sum.
- the maximum intensity magnification when using 25 semiconductor lasers is 25.
- Spot diameter is defined as another evaluation index.
- the spot diameter in the X direction and the Y direction is calculated with a range of the intensity of 13.5% (1 / e 2 ) or more relative to the peak intensity as a spot. The smaller the spot diameter, the easier the microfabrication becomes.
- a side lobe is defined as another evaluation index.
- the ratio (%) of the intensity of the place that can be regarded as the second peak to the peak intensity is supported. And a drip rope.
- Table 5 shows the lens specifications of Design Example 1 and the above evaluation indices.
- type 1 defines the surface of the microlens by equation (2), and the image-side condensing surface (S2 plane) by equation (3).
- the condensing surface (S2 surface) on the near image side of the microlens surface is defined by equation (3).
- the 0-31 plane distance represents the distance between the semiconductor laser and the corresponding microlens plane.
- BF represents pack focus.
- the free form of the surface definition represents the surface defined by equation (2), and the aspherical surface represents the surface defined by equation (3). It should be noted that design can be performed in the same manner by using equation (1) instead of equation (2).
- Table 5 shows the lens specifications of Design Example 1 and the above evaluation indices.
- type 1 defines the surface of the microlens by equation (2), and the image-side condensing surface (S2 plane) by equation (3).
- the condensing surface (S2 surface) on the near image side of the microlens surface is
- Type 1 is superior to Type 2 in all of the evaluation indexes for strength magnification, spot diameter, and side lobe.
- Type 1 wavefront aberrations are much smaller than Type 2 wavefront aberrations.
- the wavefront aberration can be made extremely small by defining the surface of the microlens by equation (2). Wear.
- Table 6 shows the coefficients for Type 1 and Type 2.
- the optical path diagram of type 1 is shown in Figs. 10 to 12, and the spot cross section including the peak is shown in Fig. 13.
- the optical path diagrams of type 2 are shown in FIGS. 14 to 16, and the spot cross section including the peak is shown in FIG. Table 6
- Table 7 shows the array of Design Example 1. Table 7
- the difference between the semiconductor lasers in Design Example 1 and Design Example 2 is the XY ratio of the emission angle to the emission angle.
- Table 8 shows the lens specifications and evaluation indices of Design Example 2.
- Table 8 also shows the lens specifications and evaluation indices of Design Example 1.
- S2 surface condensing surface
- Table 9 shows type 3 and type 4 coefficients.
- the optical path diagram of type 3 is shown in Figs. 18 to 20, and the cross-sectional view of the spot including the peak is shown in Fig. 21.
- the optical path diagrams of type 4 are shown in FIGS. 22 to 24, and the spot cross-sectional view including the peak is shown in FIG. Table 9
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
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- Semiconductor Lasers (AREA)
- Lenses (AREA)
Abstract
Description
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Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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JP2005505027A JPWO2004072698A1 (ja) | 2003-02-17 | 2004-02-17 | マイクロレンズアレイ一体型レンズ |
Applications Claiming Priority (2)
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JP2003038862 | 2003-02-17 | ||
JP2003-038862 | 2003-02-17 |
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WO2004072698A1 true WO2004072698A1 (ja) | 2004-08-26 |
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PCT/JP2004/001697 WO2004072698A1 (ja) | 2003-02-17 | 2004-02-17 | マイクロレンズアレイ一体型レンズ |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102621822A (zh) * | 2012-04-13 | 2012-08-01 | 中国科学院光电技术研究所 | 一种实现曲面到平面超分辨缩小成像光刻的透镜 |
WO2015182619A1 (ja) * | 2014-05-27 | 2015-12-03 | ナルックス株式会社 | マイクロレンズアレイ及びマイクロレンズアレイを含む光学系 |
CN109648951A (zh) * | 2019-01-04 | 2019-04-19 | 江苏科麦特科技发展有限公司 | 一种非连续铝塑复合带及其制备方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5594752A (en) * | 1992-12-07 | 1997-01-14 | Sdl, Inc. | Diode laser source with concurrently driven light emitting segments |
JP2000292738A (ja) * | 1999-04-02 | 2000-10-20 | Ricoh Co Ltd | ビーム整形光学系および記録再生装置 |
WO2001035145A1 (fr) * | 1999-11-10 | 2001-05-17 | Hamamatsu Photonics K.K. | Lentille optique et systeme optique |
JP2003344609A (ja) * | 2002-05-23 | 2003-12-03 | Fuji Photo Film Co Ltd | 集光レンズ、合波レーザー光源および露光装置 |
-
2004
- 2004-02-17 WO PCT/JP2004/001697 patent/WO2004072698A1/ja active Application Filing
- 2004-02-17 JP JP2005505027A patent/JPWO2004072698A1/ja active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5594752A (en) * | 1992-12-07 | 1997-01-14 | Sdl, Inc. | Diode laser source with concurrently driven light emitting segments |
JP2000292738A (ja) * | 1999-04-02 | 2000-10-20 | Ricoh Co Ltd | ビーム整形光学系および記録再生装置 |
WO2001035145A1 (fr) * | 1999-11-10 | 2001-05-17 | Hamamatsu Photonics K.K. | Lentille optique et systeme optique |
WO2001035146A1 (fr) * | 1999-11-10 | 2001-05-17 | Hamamatsu Photonics K.K. | Lentille optique et systeme optique |
JP2003344609A (ja) * | 2002-05-23 | 2003-12-03 | Fuji Photo Film Co Ltd | 集光レンズ、合波レーザー光源および露光装置 |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102621822A (zh) * | 2012-04-13 | 2012-08-01 | 中国科学院光电技术研究所 | 一种实现曲面到平面超分辨缩小成像光刻的透镜 |
CN102621822B (zh) * | 2012-04-13 | 2014-03-05 | 中国科学院光电技术研究所 | 一种实现曲面到平面超分辨缩小成像光刻的透镜 |
WO2015182619A1 (ja) * | 2014-05-27 | 2015-12-03 | ナルックス株式会社 | マイクロレンズアレイ及びマイクロレンズアレイを含む光学系 |
US10443811B2 (en) | 2014-05-27 | 2019-10-15 | Nalux Co., Ltd. | Microlens array and optical system including the same |
CN109648951A (zh) * | 2019-01-04 | 2019-04-19 | 江苏科麦特科技发展有限公司 | 一种非连续铝塑复合带及其制备方法 |
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JPWO2004072698A1 (ja) | 2006-06-01 |
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