WO2005029114A2 - Geodätisches gerät mit einer laserquelle - Google Patents
Geodätisches gerät mit einer laserquelle Download PDFInfo
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- WO2005029114A2 WO2005029114A2 PCT/EP2004/010478 EP2004010478W WO2005029114A2 WO 2005029114 A2 WO2005029114 A2 WO 2005029114A2 EP 2004010478 W EP2004010478 W EP 2004010478W WO 2005029114 A2 WO2005029114 A2 WO 2005029114A2
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- WIPO (PCT)
- Prior art keywords
- mode
- radiation
- laser diode
- laser
- fiber
- Prior art date
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4814—Constructional features, e.g. arrangements of optical elements of transmitters alone
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C15/00—Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
- G01C15/002—Active optical surveying means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4811—Constructional features, e.g. arrangements of optical elements common to transmitter and receiver
- G01S7/4813—Housing arrangements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4818—Constructional features, e.g. arrangements of optical elements using optical fibres
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/483—Details of pulse systems
- G01S7/484—Transmitters
Definitions
- the invention relates to a geodetic device with a laser source according to the preamble of claim 1.
- the emission of laser light is necessary or advantageous. This applies, for example, to distance measurement, target illumination or the measurement of physical properties, such as for dispersion correction or: for LIDAR systems for analyzing air pollution. Suitable methods and devices for distance measurement are described, for example, in EP 0 738 899 B1 and in European Patent Application No. 03003738, which was not yet published at the time of filing.
- the different applications make different demands.
- the distances to be bridged or measured require the highest possible powers of the laser sources in continuous or at least pulsed operation.
- the term "geodetic device with a laser source” is intended to generalize Always be understood a measuring instrument or an instrument that is used in connection with measurements, such as a range finder, LIDAR system or a theodolite, which emits laser radiation and is used to measure or check data with spatial reference. In particular, this relates to the measurement of distance and / or direction or angles to a reference or measuring point.
- the radiation source can also perform other or additional tasks, such as, for example, providing a visible laser beam for analytical purposes, for marking a target or for displaying the point of a laser in the invisible spectral range.
- such a geodetic device should be understood to mean three-dimensional scanning systems, theodolites and also so-called total stations as tachymeters with electronic angle measurement and electro-optical range finders.
- the invention is also suitable for use in specialized devices with a similar functionality, for example in military observation, fire control or directional control applications or in industrial building or process monitoring; these systems are hereby also included under the term “geodetic device with a laser source”.
- the requirements for the laser emission of geodetic devices resulting for this most important area of application concern the power and the mode structure. While powers in the mW range are achieved with continuous emission, it is advantageous for distance measurements over larger distances to achieve powers in the range of a few 10 W, but high-energy pulses can be achieved.
- a beam cross-section that is as small and homogeneous as possible should be made available, so that resolution of small structures is also possible.
- the beam cross-section or the beam profile should, if possible, remain the same over the entire measuring distance or only change slightly. For this reason, it is advantageous to use the emission of the TEM ⁇ o mode and to suppress the occurrence of higher modes, since these have a larger extent and structure.
- Such a mode has an ideal Gaussian profile and there are no phase shifts in the electric field across the beam, so that the beam is completely spatially coherent.
- Laser diodes are frequently used as laser sources in prior art geodetic devices.
- these semiconductor lasers have the disadvantage that they emit in multi-mode operation and have a geometrically unfavorable beam cross section as edge emitters.
- an optical rangefinder which deflects the partial beams of an edge emitting laser diode by means of a downstream beam shaping optics and directs them onto the aperture of an objective lens in such a way that they essentially fill it.
- the emission of Laser diode is still a multi-mode characteristic.
- Another object of the present invention is to enable structural improvements in terms of size, complexity, energy consumption and / or structure for a geodetic measuring device with a laser source.
- Another object of the present invention is to enable the use of the variation possibilities in the design of the laser emission which can be achieved by commercially available laser diodes, also for geodetic devices.
- Another object of the present invention is to influence the emitted radiation, e.g. in terms of the shape of the emission wavefront.
- the invention relates to the influencing of the S trahlungsfeldes a geodetic instrument in the resonator of the laser source.
- a semiconductor used as the S trahlungsstagedes element in the resonator laser diode would emit fashion without further measures in the multi but whose radiation through a mode-selective component is influenced so that the radiation emitted by the radiation source has a monomodal characteristic.
- Suitable laser diodes for this purpose are commercially available in a large selection and range of variations. In particular, the available wavelength ranges extend from the infrared to the violet range, so that a spectral emission tailored to the intended purpose is possible.
- the laser diode is introduced as a component in a resonator or represents an end of such a resonator, so that the cavity is also defined by an external component outside the laser diode.
- the radiation field propagating in this cavity or the resonator is influenced by the mode-selective component in such a way that a monomodal emission of the radiation source occurs and / or the laser diode itself is caused to monomodal emission.
- a conventional edge emitter or a vertically emitting diode such as e.g. a Vertical Cavity Surface Emitting Laser (VCSEL) or a Novalux Extended Cavity Surface Emitting Laser (NECSEL) can be used.
- VCSEL Vertical Cavity Surface Emitting Laser
- NECSEL Novalux Extended Cavity Surface Emitting Laser
- the structure of such a NECSEL is disclosed, for example, in WO 01/67563 A2.
- the advantage of these vertically emitting laser diodes is, among other things, that subsequent beam shaping can be dispensed with due to the essentially circular beam cross section.
- the components customary in general laser physics can be used as the mode-selective element, e.g. suitably shaped mirrors for the design of unstable or mode-selective resonators, saturable absorbers or interferometers.
- mode-selective element e.g. suitably shaped mirrors for the design of unstable or mode-selective resonators, saturable absorbers or interferometers.
- single-mode fibers or (pinhole) diaphragms in particular can be used as mode-selective components. These components suppress the formation or oscillation of higher modes within the resonator, so that the circulating radiation pulse is largely monomodal.
- the resonator or the cavity is defined by a mirror and a partially transparent mirror, it being possible for the completely reflecting side of the laser diode to be used as one of the resonator mirrors.
- Appropriate optics made of lenses or cylindrical lenses can be used to couple the radiation into and out of the mode-selective element, but fibers, reflective or diffractive elements can also be used according to the invention. Because of the larger resonator length compared to the unchanged laser diode, it can be advantageous to compensate for the increase in the pulse length that results from this. Components which are generally used in laser physics can be used to achieve the negative dispersion required for this.
- pairs of prisms or grids or Gires-Tournois interferometers allow suitable pulse compression.
- such or other elements with a pulse-influencing effect such as, for example, saturable absorbers, can be used for shaping and temporally and spatially designing the radiation field in the cavity or the pulse.
- the design options of such components can also be used according to the invention in connection with semiconductor lasers and in geodetic devices.
- An amplifier located outside the resonator can be used to amplify the radiation generated in the beam-generating laser diode.
- a second multi-mode laser diode which is used without reflective coatings or with antireflection coatings in transmission mode in the form of a master oscillator power amplifier (MOPA)
- MOPA master oscillator power amplifier
- the radiation source has a good radiation provides defined optical pulse shape. This should have a flat, non-curved emission wavefront and a pulse duration of less than 500 ns.
- FIG. 2 shows the schematic representation of a first laser source according to the invention with a single-mode fiber as a mode-selective component
- FIG. 3 shows the schematic representation of a second laser source according to the invention with a first suitable resonator mirror arrangement as a mode-selective component
- FIG. 4 shows the schematic representation of a third laser source according to the invention with a second suitable resonator mirror arrangement as a mode-selective component
- FIG. 5 shows the schematic representation of a fourth laser source according to the invention with an aperture as a mode-selective component
- FIG. 6 shows the schematic representation of a fifth laser source according to the invention with a vertically emitting laser diode (VCSEL) as the radiation-generating laser diode and a single-mode fiber as the mode-selective component;
- VCSEL vertically emitting laser diode
- FIG. 7 shows the schematic representation of a sixth laser source according to the invention with an edge-emitting laser diode, a single-mode fiber as a mode-selective component and a laser diode as an amplifier; 8 shows the schematic representation of a seventh laser source according to the invention with an edge-emitting laser diode, a distributed grating in a fiber as a mode-selective component and a laser diode as an amplifier;
- Figure 9 is a schematic representation of an eighth inventive laser source with an edge-emitting laser diode, a photonic fiber as a mode selective component and a 'laser diode as an amplifier;
- FIG. 10 shows the schematic representation of a ninth laser source according to the invention with an edge-emitting laser diode, an aperture as a mode-selective component and a laser diode as an amplifier;
- FIG. 11 shows the schematic representation of a tenth laser source according to the invention with a vertically emitting laser diode (VCSEL), a single-mode fiber as a mode-selective component and a laser diode as an amplifier;
- VCSEL vertically emitting laser diode
- FIG. 12 shows the schematic representation of an eleventh laser source according to the invention with an edge-emitting laser diode, a single-mode fiber as a mode-selective component and a pair of gratings for pulse compression; and 13 shows the schematic representation of a twelfth laser source according to the invention with an edge-emitting laser diode, a single-mode fiber as a mode-selective component and a Gires Tournois interferometer for pulse compression.
- FIG. 1 shows a tachymeter as an example of a geodetic device 1 according to the invention together with a more detailed explanation of some of its components in the form of a detailed illustration.
- the components of the housing of the device 1 include a laser source 2, an optical system 3 for detecting targets to be measured and a receiver 4.
- the laser source 2 has a base plate 2a on which all components are mounted.
- the laser radiation is emitted by a radiation-generating laser diode 2b and guided via a coupling-in / coupling-out optics 2c into a mode-selective component 2d, these components being located within a cavity, so that the radiation-generating laser diode 2b has an external cavity.
- the radiation emerging from the cavity and thus from the laser source 2 can be influenced by a downstream beam-shaping optics 2e.
- the optical system 3 for detecting targets to be measured has an objective lens 3a and an eyepiece unit 3b. Between these components there is a focusing element 3c and a reflecting deflecting means 3d, with the aid of which the radiation originating from the laser source 2 is coupled into the beam path of the optical system 3 and emitted via the objective lens 3a. Radiation reflected back from a target is in turn captured by the objective lens 3a and part of the radiation is guided by the reflective deflecting means 3d to a receiver 4.
- the radiation from the laser source 2 can be used in cooperation with the receiver 4, for example, to measure a distance to a target.
- the example shown is only one of many possible embodiments of geodetic devices according to the invention and serves to illustrate an example of a possible interaction of components.
- a first laser source according to the invention with a single-mode fiber as a mode-selective component is shown schematically in FIG.
- the upper figure shows a side view of the structure, which corresponds to the fast axis, whereas the lower figure corresponds to a top view and thus the slow axis.
- the laser source has an edge-emitting laser diode 5, one side of which forms a resonator mirror 6. If necessary, an additional flat mirror or a coating can also be applied to the side surface of the laser diode.
- the emission of this edge-emitting laser diode 5 is coupled into a single-mode or monomode fiber 7 as a mode-selective component via two cylindrical lenses 9a and 9b.
- the monomode fiber 7 is terminated at one end by a coupling-out mirror 8, which thus represents a second resonator mirror and thus the end of the external one Cavity defined for the edge emitting laser diode 5.
- the reflections in the monomode fiber 7 reduce the proportion of higher modes in the radiation field and, after the reflection at the coupling-out mirror 8, largely monomodal radiation is guided back into the edge-emitting laser diode 5.
- the single-mode fiber 7 can be designed as a fiber with an inner side that differs geometrically from the cylindrical shape, the inner side being the region determining the reflection or such an interface layer inside the fiber.
- This inside can in particular have a conical or curved shape, the latter also being able to be achieved by suitable deformation of a fiber with a cylindrical shape.
- the monomode fiber 7 can also be designed as a grading fiber with a refractive index profile which is variable in the fiber direction, so that an effect similar to the conical shape of the inside follows.
- a selection of modes according to the invention can be brought about by this special shape or configuration.
- the monomode fiber 7 can be designed, for example, as a light guide with an inside that deviates from the geometry of the ideal cylindrical shape.
- the choice of reflection conditions that can be implemented in this way can influence the propagation of the different modes in the fiber in such a way that higher modes are suppressed or their oscillation in the resonator is prevented. Appropriate deviations for example, the conical shape of the inside or a slight curvature of the fiber.
- the monomode fiber 7 can also be optimized with respect to the transmission of selected modes without changing geometric shapes. An example of this is training as a gradient fiber with a refractive index profile that changes in the fiber direction.
- FIG. 3 shows the schematic representation of a second laser source according to the invention with a first suitable resonator mirror arrangement as a mode-selective component.
- the laser source with edge-emitting laser diode 5 ' is caused to emit monomodal radiation by a special resonator mirror design in the cavity.
- the side of the edge-emitting laser diode 5 'which acts as a resonator mirror in FIG. 2 is designed to be transparent here and the cavity uses a separate, external concave mirror as a resonator mirror 6a, by means of which, together with the plane coupling mirror shown in FIG.
- the single-mode fiber or a reflective effect of the opposite side of the laser diode the property of a hemispherical or hemicentric resonator is achieved.
- higher modes are damped compared to the basic mode with lower losses.
- the strongly divergent emission of the edge-emitting laser diode 5 ' can be collimated in the direction of the fast axis by a cylindrical lens 9c.
- FIG. 4 shows a third laser source according to the invention with a second suitable resonator mirror arrangement as a mode-selective component.
- the edge emitting laser diode 5 '' is modified so that it no longer has any reflective sides.
- the cavity is now defined by two concave mirrors as resonator mirrors 6b and 6c, these acting together as a mode-selective component and an emission being achieved due to the partially transparent properties of the resonator mirror 6c.
- the external cavity is designed as a confocal resonator.
- the divergent radiation passing through the resonator mirror 6c is collimated by a cylindrical lens 9d in the direction of the fast axis.
- FIG. 5 A fourth laser source according to the invention is shown in FIG. 5, an aperture 11 being used as the mode-selective component.
- This embodiment has a structure similar to the embodiment shown in FIG. 3 with an edge-emitting laser diode 5 'and a hemispherical resonator. Between the resonator mirror 6d, which is designed as a concave mirror, and the edge-emitting laser diode 5 ', an aperture 11 is introduced, the opening of which, for extended, higher modes, has a damping effect and thus reinforces the mode selection of the embodiment shown in FIG.
- the emission of the edge-emitting laser diode 5 ' can be collimated in the direction of the fast axis by a cylindrical lens 9c.
- FIG. 6 shows the schematic representation of a fifth laser source according to the invention with a vertically emitting laser diode (VCSEL) 12 as a radiation-generating laser diode and a single-mode fiber 7 as a mode-selective component.
- the vertically emitting laser diode (VCSEL) 12 becomes analogous to an edge emitting laser diode the reflective effect of its surface modified to be used in a laser source according to the invention.
- existing mirrors which are designed, for example, as a distributed Bragg reflector (DBR), may have to be removed or their transmission increased in order to enable the radiation field to be fed back into the vertically emitting laser diode (VCSEL) 12.
- DBR distributed Bragg reflector
- a suitable method for removing coatings or mirrors is available, for example, in the form of plasma etching.
- VCSEL vertically emitting laser diode
- Laser diodes has a larger area.
- the emitted radiation is coupled via a lens 10b into a single-mode fiber 7, which is provided at its end with a partially transparent coupling-out mirror 8.
- the radiation emerging from this coupling-out mirror 8 can be collimated with a lens 10a.
- a more specific embodiment of a vertically emitting laser such as e.g. a NECSEL can be used.
- FIGS. 2, 5 and 6 show embodiments in which the embodiments shown in FIGS. 2, 5 and 6 are connected to an amplifying laser diode in a master oscillator power amplifier configuration.
- the cavity is followed by an amplifying laser diode, which is designed here as a conventional edge emitter, in which the reflective effect of the side surfaces has been eliminated and the transmission has been maximized. So this is Laser diode used only as a reinforcing medium, without being part of a resonator.
- FIG. 7 shows the schematic representation of a sixth laser source according to the invention with an edge-emitting laser diode 5, a single-mode fiber 7 as a mode-selective component and a reinforcing laser diode 13.
- the cavity of the laser source has an edge-emitting laser diode 5 with a resonator mirror 6, the cylindrical lenses 9a and 9b and one Single-mode fiber 7 with decoupling mirror 8.
- the radiation emitted by this cavity is coupled via two further cylindrical lenses 9b and 9a into an amplifying laser diode 13, after the passage of which the radiation can be collimated again by a cylindrical lens 9e.
- FIG. 8 shows the schematic representation of a seventh laser source according to the invention with an edge-emitting laser diode 5, a distributed grating as a spatially periodic structure in a single-mode or
- Multimode fiber 7 ' with effect as a mode-selective component and a reinforcing laser diode 13.
- the cavity of the laser source has an edge-emitting laser diode 5 with resonator mirror 6, the cylindrical lenses 9a and 9b and a fiber 7' with integrated distributed grating or another spatially periodic Structure and a coupling mirror 8.
- the radiation emitted by this cavity is coupled into an amplifying laser diode 13 via two further cylindrical lenses 9b and 9a, after the radiation has passed through it again through a
- Cylinder lens 9e can be collimated. Due to the spatially periodic structure, the wavelength can be further selected or the spectral width can be reduced. To reduce A prism can also be integrated into the spectral width of the radiation.
- FIG. 9 shows the schematic representation of an inventive laser source with an edge-emitting laser diode 5, a photonic fiber 7 ′′ as a mode-selective component and a reinforcing laser diode 13.
- the cavity of the laser source has an edge-emitting laser diode 5 with a resonator mirror 6, the cylindrical lenses 9a and 9b and a photonic fiber 7 ′′, for example a photonic band gap (PBG) fiber or a photonic crystal fiber (PCF), with decoupling mirror 8.
- PBG photonic band gap
- PCF photonic crystal fiber
- the radiation emitted by this cavity is coupled via two further cylindrical lenses 9b and 9a into an amplifying laser diode 13, after the passage of which the radiation can be collimated again by a cylindrical lens 9e.
- the modes can be shaped or selected using the photonic fiber.
- a hollow core fiber allows high performance. Basically, fibers with suitable adapted cross sections, such as e.g. rectangular cross-section, can be used to
- FIG. 10 shows the schematic representation of a ninth laser source according to the invention with an edge-emitting laser diode 5 ', an aperture 1L as a mode-selective component and a reinforcing laser diode 13.
- the cavity of the laser source which is designed as a hemispherical resonator, has an edge-emitting laser diode 5' with a concave mirror as a resonator mirror 6d and an aperture 11.
- the radiation emitted by edge-emitting laser diode 5 ' is collimated via a pair of similar cylindrical lenses 9c and coupled into the amplifying laser diode 13, after the passage of which the radiation can be collimated again by a further cylindrical lens 9c.
- FIG. 11 shows the schematic representation of a tenth laser source according to the invention with a vertically emitting laser diode (VCSEL) 12, a monomode fiber 7 and an amplifying laser diode 13.
- the cavity of the laser source has a vertically emitting laser diode (VCSEL) 12, a lens 10b and one Single-mode fiber 7 with decoupling mirror 8.
- the radiation emitted by this cavity is coupled via a lens 10c and a cylindrical lens 9e into an amplifying laser diode 13, after the passage of which the radiation can be collimated again by a cylindrical lens 9e.
- the pulse length increases, so that pulse compression is advantageous as compensation.
- the available pulse peak power can be increased by such a compression.
- FIG. 12 shows schematically an eleventh laser source according to the invention with an edge-emitting laser diode 5, a single-mode fiber 7 and a pair of gratings 14 for pulse compression.
- a pair of gratings 14 for generating negative dispersion is formed in the cavity between the edge-emitting laser diode 5 and single-mode fiber 7 arranged.
- the beam exit is parallelized by a cylindrical lens 9f and a lens 10d.
- FIG. 13 shows the schematic representation of a twelfth laser source according to the invention with an edge-emitting laser diode 5, a single-mode fiber 7 and a Gires-Tournois interferometer 15 for pulse influencing or pulse compression.
- a Gires-Tournois interferometer 15 is introduced into the cavity between the edge-emitting laser diode 5 and the single-mode fiber 7 in order to generate negative dispersion.
- the beam path is parallelized by a cylindrical lens 9g and a lens 10e.
- the folded beam path also enables a shortened design and thus space-saving integration into a geodetic device.
- a pulse influence makes it possible, for example, to avoid or correct a curved emission wavefront.
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Abstract
Description
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002539368A CA2539368A1 (en) | 2003-09-18 | 2004-09-17 | Geodesic device comprising a laser source |
JP2006526600A JP2007533962A (ja) | 2003-09-18 | 2004-09-17 | レーザー光源を備える測地線装置 |
US10/572,254 US7480316B2 (en) | 2003-09-18 | 2004-09-17 | Geodesic device comprising a laser source |
EP04765370A EP1664826A2 (de) | 2003-09-18 | 2004-09-17 | Geodätisches gerät mit einer laserquelle |
AU2004274636A AU2004274636A1 (en) | 2003-09-18 | 2004-09-17 | Geodesic device comprising a laser source |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03021085A EP1517415A1 (de) | 2003-09-18 | 2003-09-18 | Geodätisches Gerät mit einer Laserquelle |
EP03021085.0 | 2003-09-18 |
Publications (2)
Publication Number | Publication Date |
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WO2005029114A2 true WO2005029114A2 (de) | 2005-03-31 |
WO2005029114A3 WO2005029114A3 (de) | 2006-08-17 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/EP2004/010478 WO2005029114A2 (de) | 2003-09-18 | 2004-09-17 | Geodätisches gerät mit einer laserquelle |
Country Status (7)
Country | Link |
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US (1) | US7480316B2 (de) |
EP (2) | EP1517415A1 (de) |
JP (1) | JP2007533962A (de) |
CN (1) | CN1883091A (de) |
AU (1) | AU2004274636A1 (de) |
CA (1) | CA2539368A1 (de) |
WO (1) | WO2005029114A2 (de) |
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US7812933B2 (en) | 2006-07-17 | 2010-10-12 | Leica Geosystems Ag | Electro-optical range finder |
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JP2006339451A (ja) * | 2005-06-02 | 2006-12-14 | Mitsubishi Electric Corp | 半導体レーザ装置及び半導体増幅装置 |
US7812933B2 (en) | 2006-07-17 | 2010-10-12 | Leica Geosystems Ag | Electro-optical range finder |
WO2021165157A1 (de) * | 2020-02-19 | 2021-08-26 | Osram Opto Semiconductors Gmbh | Fmcw lidar lasersystem und betriebsverfahren für ein solches lasersystem |
Also Published As
Publication number | Publication date |
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AU2004274636A1 (en) | 2005-03-31 |
US7480316B2 (en) | 2009-01-20 |
WO2005029114A3 (de) | 2006-08-17 |
JP2007533962A (ja) | 2007-11-22 |
CA2539368A1 (en) | 2005-03-31 |
EP1664826A2 (de) | 2006-06-07 |
CN1883091A (zh) | 2006-12-20 |
EP1517415A1 (de) | 2005-03-23 |
US20070053402A1 (en) | 2007-03-08 |
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