WO2003075074A1 - Modulationsvorrichtung - Google Patents
Modulationsvorrichtung Download PDFInfo
- Publication number
- WO2003075074A1 WO2003075074A1 PCT/EP2003/001606 EP0301606W WO03075074A1 WO 2003075074 A1 WO2003075074 A1 WO 2003075074A1 EP 0301606 W EP0301606 W EP 0301606W WO 03075074 A1 WO03075074 A1 WO 03075074A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- modulation
- laser radiation
- modulation device
- designed
- partial
- Prior art date
Links
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
- G02B27/10—Beam splitting or combining systems
- G02B27/12—Beam splitting or combining systems operating by refraction only
- G02B27/126—The splitting element being a prism or prismatic array, including systems based on total internal reflection
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/02—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the intensity of light
-
- 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
- G02B27/10—Beam splitting or combining systems
- G02B27/14—Beam splitting or combining systems operating by reflection only
- G02B27/143—Beam splitting or combining systems operating by reflection only using macroscopically faceted or segmented reflective surfaces
-
- 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
- G02B27/10—Beam splitting or combining systems
- G02B27/14—Beam splitting or combining systems operating by reflection only
- G02B27/144—Beam splitting or combining systems operating by reflection only using partially transparent surfaces without spectral selectivity
-
- 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
- G02F1/01—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 for the control of the intensity, phase, polarisation or colour
- G02F1/21—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 for the control of the intensity, phase, polarisation or colour by interference
- G02F1/212—Mach-Zehnder type
Definitions
- the present invention relates to a modulation device for laser radiation, comprising at least one modulation means which can at least partially change the laser radiation passing through the modulation device.
- Modulation devices of the aforementioned type are well known. They can be used in different areas of application. Here, for example, laser printers, laser television or workpiece processing by laser radiation should be mentioned.
- a typical modulation means used in the prior art is a so-called GLV modulator.
- GLV modulator is operated in reflection. On its reflecting surface, it has a large number of parallel web-shaped segments which can reflect the laser radiation. Each of these segments can be tilted selectively.
- the modulation usually takes place in that two directly adjacent segments are tilted differently, or one of the segments is tilted and the other is left in its original position, so that this different tilting of the two adjacent segments between the two adjacent ones a small phase difference arises on the partial beams incident on these segments.
- this phase difference leads to the fact that the propagation characteristic of the light reflected by the modulator can be changed in a targeted manner.
- the problem on which the present invention is based is the creation of a modulation device of the type mentioned at the outset, which is designed more effectively, in particular when using a laser diode bar or a laser diode stack as a laser light source.
- the modulation device comprises beam splitter means that can split the laser radiation into at least two partial beam bundles, that the device further comprises beam combining means in the beam propagation direction behind the beam splitter means that can bring together at least two of the partial beam bundles again, and that the at least one modulation means between Beam splitter means and the beam combining means is arranged such that at least one of the partial beam bundles can be changed by the at least one modulation means such that the laser radiation combined by the beam combining means or in the area of the beam combining means at least in a predetermined spatial area due to interference of the at least two partial beam bundles Has modulation. It has been found to be advantageous in such a device that the quality and the resolution of the modulation are independent of the coherence of the laser radiation used, due to the splitting into two partial beam bundles corresponding to one another.
- the laser radiation has a greater divergence at least in sections in a first direction perpendicular to the middle direction of propagation than in a second direction perpendicular to the middle direction of propagation and the first direction, the separation into partial beams in the first direction.
- the first direction corresponds to greater divergence of the fast axis
- the second direction corresponds to smaller divergence of the slow axis.
- the separation takes place in the first direction, and thus in the direction of the fast axis, the change in the corresponding partial beam bundle will also take place in the direction of the fast axis, so that the coherence of the laser radiation in the fast axis is additionally increased. Direction is exploited.
- the beam splitter means as a prism, in particular as an at least partially mirrored prism are trained.
- the beam splitter means could also be designed as a partially transparent mirror.
- the beam combining means are designed as a prism, in particular as an at least partially mirrored prism.
- the beam combining means could also be designed as a partially transparent mirror.
- the at least one modulation means can change the at least one partial beam bundle in such a way that it experiences targeted phase shifts of individual or all partial beams, in particular by half a wavelength of the laser radiation. This shows a clear difference from the prior art, in which a phase shift with respect to one another was communicated within a partial beam bundle.
- adjacent partial beams of the same partial beam bundle are not provided with a phase shift with respect to one another, but in particular a phase shift is only effected in one of the two partial beam bundles by a modulation means, so that only after the two partial beam bundles have been combined, on the beam combining means or in the region of the beam combining means or a modulation is caused behind the beam combining means by interference.
- the modulation means are designed as a modulator to be operated in reflection, in particular as a GLV modulator, two or four or six adjacent segments of the modulator no longer contribute to a modulation point or to a modulation bit, but in a preferred one Fall just a single one Element. In this way, the resolution with which the laser radiation can be modulated can of course be increased considerably.
- the modulation means are designed as a modulator to be operated in transmission.
- the modulation means are designed as a two-dimensional modulator, with which a laser radiation impinging on it can be modulated with respect to two directions that are essentially perpendicular to one another. In this way, flat information can be modulated onto the laser radiation, which, for example, can make a line-wise rastering during the printing process or the like superfluous in some areas.
- a modulation device can even use a three-dimensional modulator with which a laser radiation impinging on it can be modulated with respect to three directions that are essentially perpendicular to one another.
- a modulation device according to the invention comprising beam splitter means, modulation means and beam combining means can be regarded as an interferometer. All known interferometer types, such as a Michelson interferometer, are therefore suitable for a modulation device according to the invention with regard to the arrangement of the aforementioned elements with respect to one another.
- a diaphragm is arranged in the beam propagation direction behind the beam combining means, which can block out parts of the laser radiation in accordance with the modulation to be achieved. It can be provided that in Beam propagation direction is arranged in front of and / or behind the aperture lens means, in particular cylindrical lenses, which image or focus the laser radiation onto the aperture and / or can collimate the focused laser radiation again after the aperture.
- a diaphragm is very well suited to certain desired parts of the Hiding laser radiation, which, for example, corresponds to a logical “0” when modulating digital information. Likewise, the proportion of laser radiation that is transmitted through the diaphragm will correspond to a logical “1”.
- the laser radiation is divided into partial beam bundles, that at least one of the partial beam bundles is then phase-shifted in accordance with the modulation to be achieved and that the partial beam bundles are then combined such that the desired modulation is achieved by interference of the two partial beam bundles.
- This method gives the person skilled in the art a method with which he can achieve very effective high-resolution modulation with simple means. In particular, this can be done by blanking out parts of the combined laser radiation that correspond, for example, to a logical “0”.
- the Phase shift in the fast axis direction significantly increases the quality of the modulation compared to the modulation methods known from the prior art.
- a modulation device according to the invention can be used in particular for printing applications.
- FIG. 1 a shows a side view of a modulation device according to the invention
- FIG. 1 b is a view according to the arrows Ib - Ib in FIG. 1 a;
- FIG. 2a shows a detailed view of the modulation device according to FIG. 1 a in a first state
- FIG. 2b is a view according to FIG. 2a in a second state
- FIG. 3a shows a schematic diagram which illustrates the relationship between intensity and angle of propagation of the state in FIG. 2a;
- FIG. 3b shows a diagram corresponding to FIG. 3a, which illustrates the state in FIG. 2b.
- a laser radiation 1 impinging on the modulation device can emanate from a laser light source which is designed, for example, as a laser diode bar.
- the laser light source thus has in one direction, in FIG. 1 a and FIG. 1 b in the X direction, a comparatively extensive cross section with many linear emission sources arranged next to one another and extending in the X direction.
- the laser light source, designed as a laser diode bar has a very small extension of, for example, 1 ⁇ m in the direction perpendicular thereto, namely in the Y direction. I n this Y direction, the is referred to as the fast axis, the divergence is significantly larger than in the x direction referred to as the slow axis.
- FIGS. 1 a and 1 b A modulation device according to the invention can be seen in FIGS. 1 a and 1 b.
- the modulation device comprises beam splitter means 2, which can split laser radiation 1 striking it into two partial beam bundles. I n Fig. 1 a, this division is illustrated by means of two arbitrarily selected partial beams 1 a and 1 b.
- the beam splitter means 2 consist of two prisms 2a, 2b which are identical to one another and lie on top of one another with two corresponding catheter sides and are glued to one another, for example. It can be seen from FIG. 1 a that the two partial beams 1 a, 1 b enter into two separate halves of the beam splitter means 2, namely into the two different prisms 2a, 2b.
- the laser radiation is divided into two partial beam bundles that move upward and downward from the beam splitter means 2 in FIG. 1a.
- the partial beam bundle moving upward in FIG. 1 a is reflected on a mirror 4 in such a way that it is reflected downward at an angle of ⁇ 45 ° to the Z direction.
- the downward deflected partial beam bundle is, as is illustrated by the exemplary partial beam 1b, by a modulation means 3 likewise at an angle of approximately 45 ° to the Z- Reflected upwards.
- the modulation means 3 can be designed, for example, as a GLV modulator.
- the modulation means 3 can have segments 5, in particular web-shaped segments 5, arranged next to one another in the transverse direction, ie in the X direction in FIG. 1b.
- the web-shaped segments 5 can reflect the light striking them, as is shown by way of example for the partial beam 1b.
- the angle of inclination of the individual web-shaped segments 5 is changed such that the optical path of the partial beam 1 b, for example, is increased or decreased by a short distance, which in particular can correspond to the amount of half the wavelength of the laser radiation.
- the individual segments 5 should extend in FIG. 1b over the entire width in the X direction.
- the corresponding segment 5 can thus be tilted or not tilted specifically at a specific point in the X direction.
- the partial beam bundles of the laser radiation 1 impinging on the modulation means 3 can be provided with a phase difference of half the wavelength or not provided for different X coordinates.
- the modulation device further comprises a beam combining means 6, which brings together the partial beam bundles reflected by the modulation means 3 and the mirror 4, so that the laser radiation 1, which is brought together again, propagates in the positive Z direction in FIGS. 1 a and 1 b.
- This beam combining means 6 is embodied, for example, as a prism, on the outer, possibly mirrored, sides of which the partial beam bundles are reflected such that they move in the positive Z direction after the reflection.
- the partial beam bundles reunited with one another in this way may point in accordance with the positions of the individual segments 5 of the modulation means 3 local phase differences of, for example, half the wavelength of the laser radiation used.
- a cylinder lens 7, the cylinder axis of which extends in the X direction, an aperture 8 and another cylinder lens 9, the cylinder axis of which likewise extends in the X direction, are arranged one behind the other in the Z direction.
- the aperture 8 and another cylinder lens 9 the cylinder axis of which likewise extends in the X direction, are arranged one behind the other in the Z direction.
- the diaphragm 8 consists of two diaphragm parts 8a, 8b which are arranged one above the other in the Y direction, the gap between them extending in the X direction. The gap between the diaphragm parts 8a, 8b is arranged essentially exactly on the focal line of the two cylindrical lenses 7, 9.
- FIG. 2a which only shows a schematic illustration, clarifies that there is no propagation of the parts of the laser radiation which interfere with one another in this way in the direct Z direction.
- FIG. 2a This is indicated in FIG. 2a by the fact that the laser radiation 1 focused by the lens 7 is not focused in the area of the diaphragm 8, thus in the area of the focal plane, just in the XZ plane, but just above and just below the XZ plane , Due to the introduction of the diaphragm 8 into the beam path, a laser radiation 1 modulated in this way will not emerge from the diaphragm 8 to the right, ie not in the positive Z direction.
- FIG. 3b illustrates that the propagation maximum lies approximately in the Z direction.
- FIG. 2b illustrates that the focal line of the laser radiation 1 focused by the cylindrical lens 7 lies essentially in the area of the diaphragm 8 in the XZ plane. It is thereby achieved that this part of the laser radiation passes through the diaphragm 8 essentially unhindered and, after passing through the second cylindrical lens 9, propagates parallel to the Z axis in the positive Z direction.
- Beam splitter means 2 instead of the beam splitter means 2.
- other beam combining means can also be used instead of the beam combining means 6, for example beam combining means which essentially correspond to the beam splitting means 2.
- modulation means 3 instead of the modulation means 3 designed as GLV modulators.
- modulation means which can effect two-dimensional modulation of the light impinging on the modulation means.
- the light emanating from a two-dimensional light source such as the light from a stack of laser diode bars, can be modulated accordingly.
- a partial beam bundle namely in particular the partial beam bundle deflected downward in FIG. 1 a with the partial beam 1 b picked out by way of example, is specifically provided with a phase shift in individual partial sections.
- the individual sections in which a phase shift is carried out can be specified by information that is to be modulated onto the laser radiation 1.
- the information can be, for example, print information or else information for laser television or information for machining a workpiece or the like.
- the laser radiation for example emanating from a laser diode bar
- fast-axis divergence these are cylindrical lenses, the cylinder axes of which are oriented in the X direction.
- slow-axis divergence these are arrays of cylindrical lenses whose cylinder axes are aligned in the Y direction.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Mechanical Light Control Or Optical Switches (AREA)
- Semiconductor Lasers (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/505,173 US7256928B2 (en) | 2002-03-01 | 2003-02-18 | Modulation device |
AU2003218662A AU2003218662A1 (en) | 2002-03-01 | 2003-02-18 | Modulation device |
JP2003573478A JP2005519325A (ja) | 2002-03-01 | 2003-02-18 | 変調装置 |
EP03711893A EP1483615A1 (de) | 2002-03-01 | 2003-02-18 | Modulationsvorrichtung |
KR10-2004-7013517A KR20040095242A (ko) | 2002-03-01 | 2003-02-18 | 변조장치 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10208809.8 | 2002-03-01 | ||
DE10208809 | 2002-03-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003075074A1 true WO2003075074A1 (de) | 2003-09-12 |
Family
ID=27770909
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2003/001606 WO2003075074A1 (de) | 2002-03-01 | 2003-02-18 | Modulationsvorrichtung |
Country Status (7)
Country | Link |
---|---|
US (1) | US7256928B2 (de) |
EP (1) | EP1483615A1 (de) |
JP (1) | JP2005519325A (de) |
KR (1) | KR20040095242A (de) |
CN (1) | CN100343718C (de) |
AU (1) | AU2003218662A1 (de) |
WO (1) | WO2003075074A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7537395B2 (en) | 2006-03-03 | 2009-05-26 | Lockheed Martin Corporation | Diode-laser-pump module with integrated signal ports for pumping amplifying fibers and method |
US7888620B2 (en) * | 2006-07-31 | 2011-02-15 | Electro Scientific Industries, Inc. | Reducing coherent crosstalk in dual-beam laser processing system |
CN103000190B (zh) * | 2012-12-05 | 2016-03-23 | 沈阳理工大学 | 一种四数码激光信息读写方法 |
CN106950707A (zh) * | 2017-05-25 | 2017-07-14 | 力合科技(湖南)股份有限公司 | 一种光束耦合装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3586416A (en) * | 1968-07-18 | 1971-06-22 | Philips Corp | Light modulator by gated interferometry |
US4854677A (en) * | 1987-12-21 | 1989-08-08 | Hughes Aircraft Company | Interferometric/feedback spatial light modulation system and method |
DE10009209A1 (de) * | 2000-02-26 | 2001-09-06 | Deutsche Telekom Ag | Vorrichtung zur Erzeugung, Addition und Subtraktion digitaler Folgen optischer Pulse und Verfahren zur sicheren Übertragung von Nachrichten |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3676866A (en) * | 1971-01-06 | 1972-07-11 | Bendix Corp | Optical image data processing system |
JP3085481B2 (ja) * | 1991-09-28 | 2000-09-11 | 株式会社ニコン | 反射屈折縮小投影光学系、及び該光学系を備えた露光装置 |
US5640473A (en) * | 1996-07-02 | 1997-06-17 | Gerber Systems Corporation | Method and apparatus for generating an optical beam for use in an imaging system |
US5808472A (en) * | 1996-09-17 | 1998-09-15 | Hughes Electronics Corporation | Apparatus and methods for positioning optical fibers and other resilient members |
US6088102A (en) * | 1997-10-31 | 2000-07-11 | Silicon Light Machines | Display apparatus including grating light-valve array and interferometric optical system |
JP2002062817A (ja) * | 2000-08-22 | 2002-02-28 | Funai Electric Co Ltd | 表示装置、表示方法およびビデオ装置 |
US6614580B2 (en) * | 2001-04-10 | 2003-09-02 | Silicon Light Machines | Modulation of light out of the focal plane in a light modulator based projection system |
US6567217B1 (en) * | 2001-11-06 | 2003-05-20 | Eastman Kodak Company | Image-forming system with enhanced gray levels |
-
2003
- 2003-02-18 KR KR10-2004-7013517A patent/KR20040095242A/ko active IP Right Grant
- 2003-02-18 EP EP03711893A patent/EP1483615A1/de not_active Withdrawn
- 2003-02-18 AU AU2003218662A patent/AU2003218662A1/en not_active Abandoned
- 2003-02-18 US US10/505,173 patent/US7256928B2/en not_active Expired - Fee Related
- 2003-02-18 CN CNB038050366A patent/CN100343718C/zh not_active Expired - Fee Related
- 2003-02-18 JP JP2003573478A patent/JP2005519325A/ja active Pending
- 2003-02-18 WO PCT/EP2003/001606 patent/WO2003075074A1/de active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3586416A (en) * | 1968-07-18 | 1971-06-22 | Philips Corp | Light modulator by gated interferometry |
US4854677A (en) * | 1987-12-21 | 1989-08-08 | Hughes Aircraft Company | Interferometric/feedback spatial light modulation system and method |
DE10009209A1 (de) * | 2000-02-26 | 2001-09-06 | Deutsche Telekom Ag | Vorrichtung zur Erzeugung, Addition und Subtraktion digitaler Folgen optischer Pulse und Verfahren zur sicheren Übertragung von Nachrichten |
Also Published As
Publication number | Publication date |
---|---|
KR20040095242A (ko) | 2004-11-12 |
CN1639610A (zh) | 2005-07-13 |
CN100343718C (zh) | 2007-10-17 |
US7256928B2 (en) | 2007-08-14 |
US20050152023A1 (en) | 2005-07-14 |
JP2005519325A (ja) | 2005-06-30 |
AU2003218662A1 (en) | 2003-09-16 |
EP1483615A1 (de) | 2004-12-08 |
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