WO2006056949A1 - Radiation beam source device - Google Patents
Radiation beam source device Download PDFInfo
- Publication number
- WO2006056949A1 WO2006056949A1 PCT/IB2005/053879 IB2005053879W WO2006056949A1 WO 2006056949 A1 WO2006056949 A1 WO 2006056949A1 IB 2005053879 W IB2005053879 W IB 2005053879W WO 2006056949 A1 WO2006056949 A1 WO 2006056949A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- radiation
- source device
- radiation beam
- radiation source
- output
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0065—Recording, reproducing or erasing by using optical interference patterns, e.g. holograms
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
- G02B19/0028—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed refractive and reflective surfaces, e.g. non-imaging catadioptric systems
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
- G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
- G02B19/0052—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a laser diode
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1362—Mirrors
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1372—Lenses
- G11B7/1376—Collimator lenses
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1381—Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1398—Means for shaping the cross-section of the beam, e.g. into circular or elliptical cross-section
-
- 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
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/14—External cavity lasers
- H01S5/141—External cavity lasers using a wavelength selective device, e.g. a grating or etalon
-
- 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
- H01S2302/00—Amplification / lasing wavelength
-
- 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
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/065—Mode locking; Mode suppression; Mode selection ; Self pulsating
- H01S5/0656—Seeding, i.e. an additional light input is provided for controlling the laser modes, for example by back-reflecting light from an external optical component
Definitions
- the present invention relates to a radiation source device for an optical storage system and an optical data storage device comprising such a radiation source device. More particularly, the present invention relates to a radiation source device and an optical data storage device for two-dimensional optical data storage for applications such as a compact disc, a digital versatile disc and blu-ray disc storage, and for three-dimensional optical storage for applications such as holography storage.
- the present invention has the advantage that the beam shaper element, the collimating element and the output coupler build up an optical resonator for the radiation- emitting element. Hence, both the beam shaper and the collimating element are arranged in the light path between the radiation emitting element and the output coupler. Thereby, the loss of energy inside the optical resonator is reduced so that a high efficiency is achieved. Further, the radiation source device outputs a circular shaped radiation beam with a nearly flat intensity profile so that a further shaping and collimating of the radiation beam outside the radiation source device is not necessarily necessary.
- the measure as defined in claim 5 has the advantage that, depending on the application, a radiation beam output with a flat intensity profile or with a slightly reverse intensity profile can be formed.
- a flat intensity profile can be obtained with a flat intensity profile collimator lens. This is preferred for two-dimensional recording systems, wherein the rim intensity of the radiation beam is larger than 60% of the center intensity.
- the measure as defined in claim 9 has the advantage that the wavelength of the radiation beam output can easily be changed. A control of this wavelength can be provided by the measure as defined in claim 10.
- the measure as defined in claim 11 has the advantage that an adjustment and control of the wavelength of the radiation beam output from the radiation source device is provided without any mechanically moving parts.
- the mirror element can comprise a liquid crystal mirror.
- the measure as defined in claim 12 has the further advantage that the radiation beams of different wavelengths incidenting on the mirror element are at least nearly parallel to each other.
- the mirror element can be arranged so that the radiation beams of different wavelengths are incidenting perpendicular on the surface of the mirror element.
- the reflection of the radiation beams on the mirror element is improved so that the efficiency of the radiation source device is improved over the whole range of provided frequencies.
- the measure as defined in claim 13 has the advantage that the reflection of the radiation beams of different wavelengths on the mirror element is further improved.
- Fig. 1 shows a radiation source device according to a first embodiment of the present invention
- Fig. 2 shows a graph illustrating different intensity profiles of a radiation beam
- Fig. 3 shows a radiation source device according to a second embodiment of the present invention
- Fig. 4 shows a radiation source device according to a third embodiment of the present invention.
- Fig. 5 shows a radiation source device according to a fourth embodiment of the present invention.
- Fig. 6 shows an optical data storage device comprising a radiation source device, as shown in anyone of Figs. 1, 3, 4 and 5.
- Fig. 1 shows a radiation source device 1 according to a first embodiment of the invention.
- the radiation source device 1 can be used in an optical storage system, especially for two-dimensional optical data storage and three-dimensional holographic storage.
- the optical storage system can use a compact disc, a digital versatile disc, a blu-ray disc, a storage medium for holographic storage or an other optical storage medium.
- the radiation source device 1 of the invention is not limited to this mentioned data storage systems and can also be used in other applications.
- the radiation source device 1, as shown in Fig. 1, comprises a radiation- emitting element 2.
- the radiation-emitting element 2 comprises a semiconductor laser 3 and can comprise further elements such as lenses.
- the radiation-emitting element 2 is emitting an elliptical radiation beam 4.
- the elliptical radiation beam 4 can, for example, comprise an elliptical beam profile with an aspect ratio of 1 to 3 or 2 to 3. Thereby, the divergence of the radiation beam 4 in the plane parallel to the active region of the semiconductor laser 3, i.e. parallel to the polarization axis, is a factor 2 to 3 lower than for the perpendicular direction.
- the radiation beam 4 is input to a beam shaper element 5 for shaping the radiation beam 4 emitted from the radiation-emitting element 2 in a radiation beam with a circular beam profile.
- the radiation beam 6 output from the beam shaper element 5 has an aspect ratio of at least nearly 1.
- the circular radiation beam 6 is input to a collimating element 7.
- the collimating element 7 is arranged to collimate the radiation beam 6 and to create an at least nearly flat intensity profile.
- the collimating element 7 can be or comprise a flat intensity profile lens or a reversed intensity profile lens.
- a reversed intensity profile lens is preferred for holographic systems using a spatial light modulator.
- the collimating element 7 outputs a radiation beam 8 having a circular beam profile and an at least nearly flat intensity profile.
- the radiation beam 8 is incidented on an output coupler 9.
- the output coupler 9 comprises a bragg reflector 10 mounted on a transparent substrate 11.
- the bragg reflector 10 reflects a part of the incident radiation beam 8 back to the radiation emitting element 2.
- the reflected radiation beam 8 passes successively through the collimating element 7 and the beam shaper element 5.
- an aspect ratio and intensity profile corresponding to the radiation beam 6 is again obtained for the reflected beam.
- the radiation-emitting element 2 and the beam shaper element 5 an aspect ratio of the beam profile and an intensity profile corresponding to the radiation beam 4 is again obtained by the reflected beam. Therefore, the loss of radiation is reduced and a high efficiency for the radiation source device 1 is achieved.
- the part of the radiation beam 8 not reflected back to the radiation emitting element 2 passes through the bragg reflector 10 and the transparent substrate 11 and is output as an output radiation beam 12 of the radiation source device 1.
- the radiation-emitting element may be or comprise a gain medium, or may be or comprise a semiconductor laser or a semiconductor laser chip such as for example used in lasers applied in compact disc or digital versatile disc systems.
- the radiation- emitting element 2 can comprise a semiconductor laser 3 with an output power of 70 mW and a wavelength of 405 nm in free running mode.
- Fig. 2 shows a diagram for illustrating the intensity profile of the output radiation beam 12 of the radiation source device 1.
- the solid line 17 shows the intensity profile of a Gaussian intensity profile.
- the radiation beam 4 can have this Gaussian intensity profile.
- the solid line 18 shows a flat intensity profile. In this case, the intensity of the radiation beam in the center 19 is equal to the intensity in the region of the rim 20.
- the discontinuous line 21 shows a reversed intensity profile. Thereby, a rim intensity in the rim 20 is slightly greater than the center intensity in the center 19 of the radiation beam. Therefore, the line 21 shows a nearly flat intensity profile.
- the output radiation beam 12 can comprise the intensity profile shown by the solid line 18 or the discontinuous line 21.
- the intensity profile of the radiation beam 8 corresponds to the intensity profile of the radiation beam 12.
- Fig. 3 shows a second embodiment of the radiation source device 1 of the present invention.
- the radiation beam 8 output from the collimating element 7 is incidented on a refractive grating 25 of the output coupler 9.
- the refractive grating 25 serves as a tuning grating and is mounted on a substrate 26.
- the substrate 26 is not necessarily transparent.
- the angle of incidence of the radiation beam 8 with respect to the refractive grating 25 is at least nearly 45°.
- the aspect ratio of the beam profile of the output radiation beam 12 equals at least nearly that of the radiation beam 8.
- the output radiation beam 12 also has a circular beam profile.
- the refractive grating 25 mounted on the substrate 26 is mechanically movable.
- the ruling of the refractive grating is preferred to be around 3000 lines per mm.
- the total variation in the angle of incidence is 25 mrad.
- Such a variation is applied by means of a piezo-element 29.
- the piezo-element 29 is attached to the substrate 26 opposite to the bearing 27 and fixed on one side relative to the radiation emitting element 2.
- the wavelength of the output radiation beam 12 is controlled by applying a voltage to the piezo element 29.
- the first order of the reflected radiation beam 8 is directed back towards the semiconductor laser 3 of the radiation-emitting element 2.
- the zero order reflection of the radiation beam 8 then serves as the output radiation beam 12.
- the output coupler comprises the refractive grating 25, the substrate 26, the bearing 27 and the piezo-element 29.
- Fig. 4 shows a third embodiment of the present invention.
- the radiation source device 1 of the third embodiment comprises a reflecting element 25 and a mirror element 40.
- the reflecting element 25 is a refractive grating 25.
- the refractive grating 25 mounted on the substrate 26 and the mirror element 40 are fixed with respect to the radiation emitting element 2.
- the radiation beam 4 from the radiation-emitting element 2 propagates through the beam shaper element 5 and the collimating element 7 and is subsequently dispersed on the refractive grating 25.
- the zeroth order reflection from the refractive grating 25 is used for outcoupling the output radiation beam 12.
- the radiation beam 37 reflected in first order from the refractive grating 25 is focused with a focusing lens 39 on the mirror element 40.
- the mirror element 40 comprises a changeable reflecting area 43 adapted as a high reflecting part of the mirror element 40. From the reflecting area 43 the radiation beam 37 is fed back into the radiation-emitting element 2 via all the optical elements 39, 25, 7 and 5.
- the reflecting area 43 of the mirror element 40 is in the focal plane of the focusing lens 39.
- Fig. 5 shows a fourth embodiment of the present invention.
- the radiation source device 1 of the fourth embodiment comprises the reflecting element 25 which is a refractive grating 25.
- the radiation source device 1 comprises a further reflecting element 35 which is a refractive grating 35.
- the refractive grating 35 is mounted on a substrate 36 which is not necessarily transparent.
- the refractive grating 25 mounted on the substrate 26 and the refractive grating 35 mounted on the substrate 36 are fixed with respect to the radiation-emitting element 2.
- the radiation beam 8 is incidented in zero order to the refractive grating 25, and a radiation beam 37 is reflected in first order from the refractive grating 25 to the further refractive grating 35.
- the radiation beam 37 is incidented in first order to the refractive grating 35, and a radiation beam 38 is reflected from the refractive grating 35 in zero order.
- the radiation beam 37 passes through a focusing lens 39 for focusing the radiation beam 38 on the mirror element 40.
- the mirror element 40 is arranged in the focal point of the focusing lens 39.
- the mirror element 40 is arranged to reflect the incident radiation beam 38 at a changeable reflecting area 43.
- the reflecting area 43 can be changed to another reflecting area of the mirror element 40, for example, to the reflecting area 44.
- the refractive grating 35 placed between the focusing lens 39 and the mirror element 40 diffracts the radiation beam 38 reflected from the mirror element 40 back to its original direction. Therefore, at least a part of the radiation beam 38 is reflected back via the refractive grating 35 and the refractive grating 25 to the radiation emitting element 2 so that an external resonator is built up for a specific wavelength.
- a surface 41 of the refractive grating 25 is arranged parallel to a surface 42 of the refractive grating 35. If the reflecting area 43 is changed to the reflecting area 44, then a different light path is selected, as shown by the discontinuous line. In this case, due to the wavelength dependent direction of the first order reflection from the refractive grating 25, the radiation beam 37' of first order reflection is selected. The radiation beam 37' is incidented on the refractive grating 35. A radiation beam 38' is therefore reflected in zero order from the refractive grating 35. The radiation beam 37' passes through the focusing lens 39 so that the radiation beam 38' is focused on the mirror element 40 at the reflecting area 44.
- the mirror element 40 can be arranged so that the angle of incidence of both the radiation beam 38 and the radiation beam 38' on the surface 46 of the mirror element 40 is 90°. Hence, the efficiency of the reflection on the mirror element 40 is high and at least nearly independent from the selected wavelength.
- the mirror element 40 is connected to a control unit 45, wherein the control unit 45 controls the position of the reflecting area 43, 44 on the screen of the mirror element 40. Therewith, the control unit 45 controls the wavelength of the output radiation beam 12 which is reflected from the refractive grating 25 in zero order.
- the output coupler 9 comprises the refractive grating 25 mounted on the substrate 26, the refractive grating 35 mounted on the substrate 36, the focusing lens 39 and the mirror element 40 connected to the control unit 45.
- the output coupler 9 of the radiation source device 1 according to the fourth embodiment of the invention has the advantage that the wavelength of the radiation beam 12 can be tuned relatively fast, without the use of moving parts in the resonator. Further, less losses at the outer ends of the tuning rang of the radiation source device 1 are achieved.
- Fig. 6 shows an optical data storage device 50 for optical data storage comprising a radiation source device 1 according to anyone of the first, second, third or fourth embodiments.
- the optical data storage device 50 also comprises a read/write-unit 51 for reading and writing operations for optical data storage.
- the output radiation beam 12 output from the radiation source device 1 is applied to the read/write-unit 51.
- volumetric holographic data storage needs a radiation source with a long coherence length, and for wavelength multiplexing also a tunable source.
- the radiation source device 1 solves the problem concerning light path efficiency.
- the radiation source device 1 can also be arranged to provide a single longitudinal mode. This has the advantage of a small optical feedback sensitivity, and consequently an increased signal to noise ratio.
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- Optical Head (AREA)
- Semiconductor Lasers (AREA)
- Holo Graphy (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/719,951 US20080298404A1 (en) | 2004-11-29 | 2005-11-23 | Radiation Beam Source Device |
EP05807223A EP1820188A1 (en) | 2004-11-29 | 2005-11-23 | Radiation beam source device |
JP2007542468A JP2008522335A (en) | 2004-11-29 | 2005-11-23 | Radiation beam source device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04106156 | 2004-11-29 | ||
EP04106156.5 | 2004-11-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006056949A1 true WO2006056949A1 (en) | 2006-06-01 |
Family
ID=36056268
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2005/053879 WO2006056949A1 (en) | 2004-11-29 | 2005-11-23 | Radiation beam source device |
Country Status (7)
Country | Link |
---|---|
US (1) | US20080298404A1 (en) |
EP (1) | EP1820188A1 (en) |
JP (1) | JP2008522335A (en) |
KR (1) | KR20070086657A (en) |
CN (1) | CN101065801A (en) |
TW (1) | TW200627429A (en) |
WO (1) | WO2006056949A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2012313A1 (en) | 2007-07-02 | 2009-01-07 | Thomson Licensing | Beam shaper for an optical storage system |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU2014200618A1 (en) * | 2013-03-15 | 2014-10-02 | Csir | Method of operating a laser and laser apparatus using intra-cavity digital holograms |
Citations (7)
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US5450237A (en) * | 1991-09-11 | 1995-09-12 | Sharp Kabushiki Kaisha | Hyperresolution optical system |
EP0955707A2 (en) * | 1998-05-06 | 1999-11-10 | Fuji Photo Film Co., Ltd. | Laser system |
US20010019435A1 (en) * | 1997-05-07 | 2001-09-06 | Sony Corporation | Optical pickup device |
US20030053221A1 (en) * | 1999-12-15 | 2003-03-20 | Coufal Hans J. | System for converting optical beams to collimated flat-top beams |
WO2004040338A1 (en) * | 2002-11-01 | 2004-05-13 | Koninklijke Philips Electronics N.V. | Beam-shaping optical element and method and program for designing the same |
EP1441334A2 (en) * | 2003-01-22 | 2004-07-28 | Matsushita Electric Industrial Co., Ltd. | Optical head, optical information recording/reproducing apparatus, computer, video recording/reproducing apparatus, server and car navigation system |
US20040145809A1 (en) * | 2001-03-20 | 2004-07-29 | Karl-Heinz Brenner | Element for the combined symmetrization and homogenization of a bundle of beams |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5321717A (en) * | 1993-04-05 | 1994-06-14 | Yoshifumi Adachi | Diode laser having minimal beam diameter and optics |
US6256328B1 (en) * | 1998-05-15 | 2001-07-03 | University Of Central Florida | Multiwavelength modelocked semiconductor diode laser |
US7295356B2 (en) * | 2001-06-08 | 2007-11-13 | Inphase Technologies, Inc. | Method for improved holographic recording using beam apodization |
US6809808B2 (en) * | 2002-03-22 | 2004-10-26 | Applied Materials, Inc. | Wafer defect detection system with traveling lens multi-beam scanner |
US7177340B2 (en) * | 2002-11-05 | 2007-02-13 | Jds Uniphase Corporation | Extended cavity laser device with bulk transmission grating |
-
2005
- 2005-11-23 CN CNA200580040840XA patent/CN101065801A/en active Pending
- 2005-11-23 WO PCT/IB2005/053879 patent/WO2006056949A1/en not_active Application Discontinuation
- 2005-11-23 KR KR1020077014511A patent/KR20070086657A/en not_active Application Discontinuation
- 2005-11-23 EP EP05807223A patent/EP1820188A1/en not_active Withdrawn
- 2005-11-23 JP JP2007542468A patent/JP2008522335A/en active Pending
- 2005-11-23 US US11/719,951 patent/US20080298404A1/en not_active Abandoned
- 2005-11-25 TW TW094141607A patent/TW200627429A/en unknown
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5450237A (en) * | 1991-09-11 | 1995-09-12 | Sharp Kabushiki Kaisha | Hyperresolution optical system |
US20010019435A1 (en) * | 1997-05-07 | 2001-09-06 | Sony Corporation | Optical pickup device |
EP0955707A2 (en) * | 1998-05-06 | 1999-11-10 | Fuji Photo Film Co., Ltd. | Laser system |
US20030053221A1 (en) * | 1999-12-15 | 2003-03-20 | Coufal Hans J. | System for converting optical beams to collimated flat-top beams |
US20040145809A1 (en) * | 2001-03-20 | 2004-07-29 | Karl-Heinz Brenner | Element for the combined symmetrization and homogenization of a bundle of beams |
WO2004040338A1 (en) * | 2002-11-01 | 2004-05-13 | Koninklijke Philips Electronics N.V. | Beam-shaping optical element and method and program for designing the same |
EP1441334A2 (en) * | 2003-01-22 | 2004-07-28 | Matsushita Electric Industrial Co., Ltd. | Optical head, optical information recording/reproducing apparatus, computer, video recording/reproducing apparatus, server and car navigation system |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2012313A1 (en) | 2007-07-02 | 2009-01-07 | Thomson Licensing | Beam shaper for an optical storage system |
EP2012311A1 (en) * | 2007-07-02 | 2009-01-07 | Deutsche Thomson OHG | Beam shaper for an optical storage system |
US8351316B2 (en) | 2007-07-02 | 2013-01-08 | Thomson Licensing | Beam shaper for an optical storage system |
Also Published As
Publication number | Publication date |
---|---|
TW200627429A (en) | 2006-08-01 |
EP1820188A1 (en) | 2007-08-22 |
KR20070086657A (en) | 2007-08-27 |
JP2008522335A (en) | 2008-06-26 |
US20080298404A1 (en) | 2008-12-04 |
CN101065801A (en) | 2007-10-31 |
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