EP1470621A1 - Procede et dispositif de telemetrie - Google Patents

Procede et dispositif de telemetrie

Info

Publication number
EP1470621A1
EP1470621A1 EP03729412A EP03729412A EP1470621A1 EP 1470621 A1 EP1470621 A1 EP 1470621A1 EP 03729412 A EP03729412 A EP 03729412A EP 03729412 A EP03729412 A EP 03729412A EP 1470621 A1 EP1470621 A1 EP 1470621A1
Authority
EP
European Patent Office
Prior art keywords
frequency
shifted feedback
radiation source
radiation
light source
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03729412A
Other languages
German (de)
English (en)
Inventor
Klaas Bergmann
Leonid P. Yatsenko
Bruce W. Shore
Gerhard Bonnet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Spheron VR AG
Original Assignee
Spheron VR AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Spheron VR AG filed Critical Spheron VR AG
Publication of EP1470621A1 publication Critical patent/EP1470621A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/10084—Frequency control by seeding
    • H01S3/10092—Coherent seed, e.g. injection locking
    • 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
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06—Systems determining position data of a target
    • G01S17/08—Systems determining position data of a target for measuring distance only
    • G01S17/32—Systems determining position data of a target for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
    • G01S17/34—Systems determining position data of a target for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal
    • 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
    • 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
    • G01S7/491—Details of non-pulse systems
    • G01S7/4911—Transmitters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06791—Fibre ring lasers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/08—Construction or shape of optical resonators or components thereof
    • H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
    • H01S3/083—Ring lasers
    • 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
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/88—Lidar systems specially adapted for specific applications
    • G01S17/89—Lidar systems specially adapted for specific applications for mapping or imaging

Definitions

  • the present invention relates to the preamble and thus deals with frequency-shifted feedback radiation sources and their use in the measurement of distances.
  • a light beam is split into a reference light beam and an object light beam.
  • the object light beam is irradiated onto an object and received back by it.
  • the reference and object light beams are then superimposed on a light receiver and it is then concluded from the superimposition signal how far the object is.
  • this procedure allows highly precise measurements; however, depth measurement is difficult for extended objects at various points.
  • FSF lasers frequency shifted feedback lasers
  • Examples of the FSF laser can be found in the essays by FV Kowalski, PD Haie and SJ Shattil “Broadband continuous-wave lasers", Opt. Lett. 13, 622 (1988) and PD Haie and FV Kowalski "Output characteristics of a frequency shifted feedback laser: theory and experiment” IEE J. Quantum Electron. 26, 1845 (1990) and by K. NAKAMURA, T. MIYAHARA, M. YOSHIDA, T. HARA and H.
  • FSF laser which contains an acousto-optical modulator in its resonator in addition to the amplification medium: Light waves entering the gain medium are amplified only for those frequencies at which the gain is greater than 1. At all other frequencies, the light is attenuated as usual. Like an oscillating string, the optical resonator now has preferred frequencies, so-called resonator modes. Each resonator mode has a certain frequency, which means that it corresponds to light of a precisely defined wavelength. Those resonator modes in which the amplification of the amplifying medium is greater than 1 are now preferably emitted.
  • this is the behavior of a laser without an acousto-optic modulator. If the acousto-optic modulator is now excited, the material vibration creates a moving grid of different densities; the light circulating in the resonator is diffracted at this density grating, an interaction of the light photons with the phonons characterizing the density oscillation of the acousto-optic modulator, which shifts the frequency of the diffracted light by the excitation frequency of the acousto-optic modulator.
  • the laser modes shift slightly in frequency with time, that is, the frequency of a mode changes with time; if there is more than one mode, this applies to all modes that vibrate in the resonator.
  • the object of this invention is to provide something new for commercial use.
  • the present invention thus proposes a frequency-shifted feedback Radiation source in front of which a means for increasing the emission frequency component beat intensity is provided.
  • the means for increasing the emission frequency component beat intensity are designed as means for increasing the non-stochastic emission frequency component beat intensity; you will therefore see an increase in intensity above that things that are caused by spontaneous emission especially in the gain medium.
  • an injection light source which injects light into the radiation source, that is to say provides a seed radiation field there.
  • an injection light source is particularly advantageous because it represents a structurally simple possibility by means of which a large number of advantageous designs can be implemented.
  • the injection light source is an injection laser. Its radiation can be guided into the resonator, in particular and / or onto the gain medium of the frequency-shifted feedback radiation source.
  • the injection light source emits light at a wavelength which is close to that at which the gain of the gain medium of the frequency-shifted feedback radiation source is 1; it can optionally be radiated near the upper and / or lower threshold wavelength.
  • the frequency of the injected light radiation will typically be within the range in which the gain G is greater than 1 and not outside. With seed injected very close to the threshold Radiation and in particular modulation of the same can, however, temporarily exceed this threshold. However, it would always be preferred to choose the irradiation frequency so that reinforcement takes place after a few resonator cycles.
  • the injection light source emits radiation in a narrow band, narrow band being related to the amplification bandwidth of the amplification medium of the frequency-shifted feedback radiation source.
  • a narrow band cannot be greater than 5%, preferably not more than 1%, of the gain bandwidth.
  • a single-mode injection laser with an exactly defined, modulable frequency and / or amplitude is used for the injection.
  • the injection light radiation is preferably varied with regard to the intensity and / or the phase.
  • This variation can take place, for example, by means of regular modulation, that is to say modulation of intensity and / or phase that obeys prescribed laws or is subject to restrictions, although this does not necessarily have to be even.
  • the modulation is not constant, but if the intensity and / or the phase of the modulation of the injection light radiation varies with time, which takes place particularly periodically. It is particularly preferred if the frequency of the intensity modulation is changed linearly within certain intervals because a linear variation of the modulation frequency of the injection light radiation provides an evaluation of The beat signals significantly simplified, in particular for distance determination.
  • the frequency of this modulation is close to that which results from the so-called chirp rate and the distance which is currently with the radiation source is determined.
  • the chirp rate is given from the frequency of the acousto-optical or other modulator within the frequency-shifted feedback radiation source, based on the radiation's orbital period in the resonator of this source.
  • the radiation source will typically be a frequency-shifted feedback laser. This can work in particular in infrared, especially in eye-safe areas.
  • the wavelength ranges which can be used particularly inexpensively for telecommunication devices and are well developed in terms of technology can also be used for the purposes of the present invention, which opens up the possibility of using inexpensive elements in the construction of arrangements and devices.
  • Radiation source can be used in a distance measuring arrangement.
  • a beam expansion optic can be provided which expands the radiation from the frequency-shifted feedback radiation source to such an extent that a surface to be examined is illuminated or illuminated widely and a means is then to be provided to directly use the back spectrum of the surface from the beat spectrum To gain height profile information.
  • FIG. 1 shows a schematic structure of a frequency-shifted feedback radiation source according to the invention
  • Fig. 4 shows the frequency spectrum of an FSF laser for a given
  • FIG. 5 shows a schematic structure for a distance measurement with an arrangement according to the present invention
  • FIG. 6 shows a gray-scale representation of a beat frequency spectrum, as can be obtained from the prior art, with position-independent artifact structures and a weak measurement signal structure which can be recognized as strips running obliquely through the image;
  • a frequency-shifted feedback radiation source 1 generally designated 1, comprises a means 2 for increasing the emission frequency component beat intensity.
  • the frequency-shifted feedback radiation source 1 is a ring laser with frequency-shifted feedback in the present example.
  • the ring resonator of the ring laser 1 is formed by two highly reflecting mirrors la, lb and an acousto-optical modulator lc, to which a piezo element lcl is assigned as an actuator and input and output prisms lc2, lc3 and which is arranged in the resonator ring in such a way that the zeroth diffraction order , shown as beam 3, while the first diffraction order guides the light circulating in the resonator.
  • the acousto-optical modulator lc is selected such that diffraction coefficients of more than 90% result for the first diffraction order, which is frequency-shifted in a known manner by the acousto-optical modulation.
  • the geometry is also selected such that the primes lc2, lc3 assigned to the acousto-optical modulator lc are compensated for in terms of their dispersion and a compact structure is nevertheless possible.
  • a fiber medium ld is arranged between the two highly reflecting mirrors la and lb, to which fiber coupling and decoupling optics 1dl and ld2 are assigned.
  • Energy is radiated into the fiber from a point laser designed here as a diode laser (not shown), so that it can be used as a gain medium.
  • the coupling takes place on a fiber switch lcl.
  • the fiber shown is a conventional ytterbium fiber with a large one usable gain bandwidth of here, for example, at least 70 nm in the spectral range around 1.2 ⁇ m;
  • Such elements are readily available from the field of optical telecommunications, just as other arrangements that can also be used, for example fiber lasers based on YAG at 1.06 ⁇ m with a few nm bandwidth or approximately erbium at 1.5 ⁇ m, could be used.
  • a fiber switch 2a is provided, via which injection light, indicated at 2b, can be coupled into the fiber via a coupling optic 2c.
  • the injection light 2b comes from an injection laser (not shown), which in turn can be modulated in a time-varying manner with regard to its amplitude and the phase of the optical carrier.
  • Passing through the acousto-optical modulator lc also changes the frequency of the light.
  • the light that has run at a predetermined frequency at the mirror la in the direction of the acousto-optical modulator will therefore arrive at the other highly reflecting mirror 1b with a shifted frequency or wavelength.
  • This, light with a shifted frequency is amplified in the fiber ld, in turn runs over the mirror la with a further frequency shift by the acousto-optical modulator lc on the Mirror lb, etc. This causes the frequency to shift with each pass.
  • the speed at which the frequency changes depends on the time it takes for the light to circulate and how strong the frequency shift is in the acousto-optic modulator.
  • the shift is carried out in the same way for all components or modes that can be amplified in the resonator, so that the frequency comb, which the modes of the FSF laser represent, are gradually shifted in a synchronous manner.
  • the frequency comb which the modes of the FSF laser represent
  • FIG. 3 shows the variation of the frequency for a given linear chirp.
  • This light is now used for distance measurement. This is only discussed by way of example for an interferometer arrangement, as shown in FIG. 5, in which the light source 1 according to the invention, a beam splitter element 4 in the outcoupling beam 3 of the light source 1, a reference path 6 to a reference surface 6 ⁇ and a measurement path 7 to a measurement object 7 ⁇ are shown, the beams being guided from the reference object 6 and from the measurement object 7 ⁇ to a detector 5.
  • the beat frequency spectrum for a laser arrangement is shown as a function of the path difference ⁇ L of the arms 6 and 7 of the measuring arrangement in a gray-scale representation.
  • the gray-scale display initially shows position-independent lines, ie lines that do not vary with the path difference ⁇ L and thus run horizontally in the picture, which are caused by a standing wave component in the acousto-optic modulator and differ after the resonator round trip time to repeat.
  • the actual measurement signal can be seen with a lot of noise, which runs diagonally through the image as a dark stripe.
  • the injection light source is put into operation, namely at a carrier frequency close to the upper region of the amplification curve, that is to say just within the region in which the amplification is greater than 1.
  • the optical carrier frequency which is drawn in with a vertical dashed line, is modulated, namely in the present example amplitude-modulated, the modulation itself also not being constant, but varying with a frequency which is approximately determined from the so-called chirp rate, i.e. the frequency shift per resonator revolution divided by the resonator round trip time and further determined by the light travel time along the path difference ⁇ L between the measuring beam path and the reference beam path in the construction of FIG. 5.
  • the modulation frequency of the injection light is therefore not kept constant, but is varied by this so-called signature value, that is, by the value that results from the chirp rate and ⁇ L from the formula
  • the structure width of the signal structure obtained is determined by the amplification bandwidth, that is to say a high bandwidth of the radiation light source with frequency-shifted feedback, that is to say of the FSF laser, which leads to good spatial resolution. Since the range measurement accuracy is essentially determined by the chirp size, it is desirable to choose a large frequency shift due to the acousto-optical modulator and a small laser resonator length of the FSF laser resonator.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Optical Radar Systems And Details Thereof (AREA)
  • Measurement Of Optical Distance (AREA)
  • Lasers (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

L'invention concerne une source de rayonnement à réaction avec décalage de fréquence, caractérisée en ce qu'elle comprend un moyen pour augmenter l'intensité du battement des composantes de la fréquence d'émission.
EP03729412A 2002-01-19 2003-01-16 Procede et dispositif de telemetrie Withdrawn EP1470621A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10204879 2002-01-19
DE10204879 2002-01-19
PCT/DE2003/000106 WO2003061084A1 (fr) 2002-01-19 2003-01-16 Procede et dispositif de telemetrie

Publications (1)

Publication Number Publication Date
EP1470621A1 true EP1470621A1 (fr) 2004-10-27

Family

ID=7713736

Family Applications (2)

Application Number Title Priority Date Filing Date
EP03729412A Withdrawn EP1470621A1 (fr) 2002-01-19 2003-01-16 Procede et dispositif de telemetrie
EP03706242A Withdrawn EP1470434A2 (fr) 2002-01-19 2003-01-20 Dispositif d'imageur a acquisition de profondeur

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP03706242A Withdrawn EP1470434A2 (fr) 2002-01-19 2003-01-20 Dispositif d'imageur a acquisition de profondeur

Country Status (5)

Country Link
US (2) US7684019B2 (fr)
EP (2) EP1470621A1 (fr)
JP (2) JP2005515642A (fr)
AU (2) AU2003235653A1 (fr)
WO (2) WO2003061084A1 (fr)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7684019B2 (en) * 2002-01-19 2010-03-23 Spheron Vr Ag Method and device for measuring distance
JP5227023B2 (ja) * 2004-09-21 2013-07-03 ディジタル シグナル コーポレイション 生理学的機能を遠隔的にモニターするシステムおよび方法
WO2006088822A2 (fr) 2005-02-14 2006-08-24 Digital Signal Corporation Systeme lidar et systeme et procede pour la fourniture de rayonnement electromagnetique comprimee
JP5043038B2 (ja) 2005-12-14 2012-10-10 デジタル シグナル コーポレイション 眼球の動きを追跡するシステムおよび方法
US8081670B2 (en) * 2006-02-14 2011-12-20 Digital Signal Corporation System and method for providing chirped electromagnetic radiation
US8717545B2 (en) 2009-02-20 2014-05-06 Digital Signal Corporation System and method for generating three dimensional images using lidar and video measurements
CN103299155B (zh) * 2011-11-11 2016-05-04 深圳市迈测科技股份有限公司 一种测距方法及系统
US10247538B2 (en) 2014-10-29 2019-04-02 Bridger Photonics, Inc. Accurate chirped synthetic wavelength interferometer
US9706094B2 (en) * 2014-12-05 2017-07-11 National Security Technologies, Llc Hyperchromatic lens for recording time-resolved phenomena
US10677924B2 (en) * 2015-06-23 2020-06-09 Mezmeriz, Inc. Portable panoramic laser mapping and/or projection system
US9970756B2 (en) 2015-10-06 2018-05-15 Bridger Photonics, Inc. High-sensitivity gas-mapping 3D imager and method of operation
WO2018170478A1 (fr) * 2017-03-16 2018-09-20 Bridger Photonics, Inc. Procédés et appareils lidar à onde continue modulée en fréquence, comprenant des exemples à boucles de rétroaction
WO2019060901A1 (fr) 2017-09-25 2019-03-28 Bridger Photonics, Inc. Systèmes et techniques de numérisation et exemples d'utilisation dans des procédés et des appareils lidar fmcw
WO2019070751A1 (fr) 2017-10-02 2019-04-11 Bridger Photonics, Inc. Traitement de segments temporels de fluctuations de longueur d'onde de laser et exemples d'utilisation dans des procédés et appareils de lidar à onde entretenue modulée en fréquence (fmcw)
CA3078553A1 (fr) 2017-10-17 2019-04-25 Bridger Photonics, Inc. Appareils et procedes de reflecteur optique rotatif
US11112308B2 (en) 2017-11-14 2021-09-07 Bridger Photonics, Inc. Apparatuses and methods for anomalous gas concentration detection
WO2019109091A1 (fr) * 2017-12-03 2019-06-06 Munro Design & Technologies, Llc Systèmes de traitement d'image numérique pour systèmes d'imagerie tridimensionnelle à intensificateurs d'image et procédés associés
US12066353B2 (en) 2018-02-01 2024-08-20 Bridger Photonics, Inc. Apparatuses and methods for gas flux measurements
CN114207530A (zh) 2019-08-09 2022-03-18 Asml荷兰有限公司 在对准中用以减小标记大小的相位调制器
WO2021028202A1 (fr) 2019-08-09 2021-02-18 Asml Netherlands B.V. Dispositif de métrologie et appareil de modulateur de phase associé
DE102022116927A1 (de) 2022-07-07 2024-01-18 Trumpf Laser Gmbh Laserbearbeitungsmaschine mit frequenzkammbasiertem Abstandssensor sowie zugehöriges Verfahren mit frequenzkammbasierter Abstandsmessung

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003060426A2 (fr) * 2002-01-19 2003-07-24 Spheron Vr Ag Dispositif d'imageur a acquisition de profondeur

Family Cites Families (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3182312A (en) * 1962-01-11 1965-05-04 Lab For Electronics Inc Vehicle detection and counting system
US4579417A (en) * 1983-01-28 1986-04-01 University Of Delaware Apparatus for optical fiber communications using standing wave acousto-optical modulator
JP2993582B2 (ja) 1992-02-24 1999-12-20 日本電信電話株式会社 光回路
JPH05322699A (ja) 1992-05-25 1993-12-07 Nippon Telegr & Teleph Corp <Ntt> 高距離分解能光伝送路測定装置
US5394238A (en) * 1992-11-09 1995-02-28 Honeywell Inc. Look-ahead windshear detector by filtered Rayleigh and/or aerosol scattered light
JP3112595B2 (ja) * 1993-03-17 2000-11-27 安藤電気株式会社 光周波数シフタを用いる光ファイバ歪位置測定装置
GB9314849D0 (en) * 1993-07-16 1993-09-01 Philips Electronics Uk Ltd Electronic devices
US6241720B1 (en) * 1995-02-04 2001-06-05 Spectra Physics, Inc. Diode pumped, multi axial mode intracavity doubled laser
EP0745022A4 (fr) * 1994-02-22 1997-09-24 Confidence Tool Co Cle a douille
US5592237A (en) * 1994-11-04 1997-01-07 Infimed, Inc. High resolution image processor with multiple bus architecture
US5592327A (en) * 1994-12-16 1997-01-07 Clark-Mxr, Inc. Regenerative amplifier incorporating a spectral filter within the resonant cavity
US5835199A (en) * 1996-05-17 1998-11-10 Coherent Technologies Fiber-based ladar transceiver for range/doppler imaging with frequency comb generator
JP3583906B2 (ja) 1996-07-15 2004-11-04 伊藤 弘昌 光学式距離計
US6147779A (en) 1998-01-14 2000-11-14 Eastman Kodak Company Digital automated roll carrier film scan mechanism
US6459483B1 (en) * 1998-02-10 2002-10-01 Toolz, Ltd. Level with angle and distance measurement apparatus
US5955992A (en) * 1998-02-12 1999-09-21 Shattil; Steve J. Frequency-shifted feedback cavity used as a phased array antenna controller and carrier interference multiple access spread-spectrum transmitter
US6603537B1 (en) 1998-08-21 2003-08-05 Surromed, Inc. Optical architectures for microvolume laser-scanning cytometers
JP2000081374A (ja) * 1998-09-04 2000-03-21 Hiromasa Ito 波長分散測定方法および測定装置
JP3631653B2 (ja) * 2000-02-21 2005-03-23 独立行政法人科学技術振興機構 群速度分散測定装置および群速度分散測定方法
WO2001095020A1 (fr) 2000-06-09 2001-12-13 California Institute Of Technology Oscillateurs opto-electroniques a forte acceleration
JP3510569B2 (ja) * 2000-06-22 2004-03-29 三菱重工業株式会社 光周波数変調方式距離計
US6331792B1 (en) * 2000-06-30 2001-12-18 Conexant Systems, Inc. Circuit and method for unlimited range frequency acquisition
EP1879045A3 (fr) 2000-08-16 2011-03-30 Valeo Radar Systems, Inc. Systèmes et techniques de radar automobile
US6462705B1 (en) * 2000-08-17 2002-10-08 Mcewan Technologies, Llc Spread spectrum radar clock
DE10045535A1 (de) 2000-09-13 2002-04-04 Gerhard Bonnet Optische Vorrichtung
US6570704B2 (en) * 2001-03-14 2003-05-27 Northrop Grumman Corporation High average power chirped pulse fiber amplifier array

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003060426A2 (fr) * 2002-01-19 2003-07-24 Spheron Vr Ag Dispositif d'imageur a acquisition de profondeur

Also Published As

Publication number Publication date
WO2003061084A1 (fr) 2003-07-24
JP2005515416A (ja) 2005-05-26
AU2003235653A1 (en) 2003-07-30
EP1470434A2 (fr) 2004-10-27
US20050117160A1 (en) 2005-06-02
US7800738B2 (en) 2010-09-21
AU2003208268A8 (en) 2003-07-30
AU2003208268A1 (en) 2003-07-30
US20050078296A1 (en) 2005-04-14
WO2003060426A3 (fr) 2003-09-12
US7684019B2 (en) 2010-03-23
WO2003060426A2 (fr) 2003-07-24
JP2005515642A (ja) 2005-05-26

Similar Documents

Publication Publication Date Title
EP1470621A1 (fr) Procede et dispositif de telemetrie
DE69935648T2 (de) Wellenlängenvariabler laser und verfahren zu seinem betrieb
DE69734946T2 (de) Ultrakurzzeit-Raster- und Verzögerungsverfahren
DE112007002376B4 (de) Optischer Frequenzgenerator und optisches Frequenzdarstellungsverfahren mittels Femtosekundenlaser-Injektionssynchronisation
DE112011103954T5 (de) Frequenzkamm-Quelle mit großem Abstand der Kammlinien
US8964803B2 (en) Wavelength sweeping light source and imaging apparatus using the same
DE69327383T2 (de) Laser-Radar mit Speicherung des Referenzstrahls
DE69623830T2 (de) Optische Rückkopplungs-Photodetektorvorrichtung
DE69121490T2 (de) Schmalbandige Pulslichtquelle und Verwendung derselben in einer Spannungsdetektionsvorrichtung
EP0314171A2 (fr) Laser à accrochage de mode
DE102016103093A1 (de) Vorrichtung und Verfahren zur Erzeugung von Laserpulsen
EP2019462B1 (fr) Détection de l&#39;apparition d&#39;impulsions multiples dans un laser soliton pompé par LD
DE69905188T2 (de) Auto-adaptierte filter zur verfeinerung der laseremission
EP3652819B1 (fr) Génération d&#39;impulsions laser synchronisées à des longueurs d&#39;onde variables
DE2319083A1 (de) Frequenzgesteuerter laser in passiver q-schaltung
DE10044405C2 (de) Verfahren zur Erzeugung von Radiofrequenzwellen und Radiofrequenzgenerator
DE1194494B (de) Steuerung oder Modulation eines optischen Senders oder Verstaerkers
EP1594020A1 (fr) Procédé de génération d&#39;un peigne de fréquences optique sans décalage et dispositif laser utilisant ce procédé
EP0883919B1 (fr) Procede et dispositif pour faire fonctionner une diode laser
DE4414585A1 (de) Vorrichtung und Verfahren zur Erzeugung kurzer Laserpulse
DE10052461A1 (de) Verfahren und Vorrichtung zum Erzeugen von Laserlicht
EP1322907B1 (fr) Mesure de la profondeur avec un laser à feedback décalé en fréquence
DE112012004435T5 (de) Phasenverriegelte Laserlicht-Quellenvorrichtung und diese verwendende, optische Kohärenztomographievorrichtung
DE1764849B1 (de) Optischer sender fuer pulsfoermiges kohaerentes licht
DE3117717A1 (de) Laseranordnung mit injektions-frequenzfuehrung

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20040819

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT SE SI SK TR

AX Request for extension of the european patent

Extension state: AL LT LV MK RO

17Q First examination report despatched

Effective date: 20070703

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20180223

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20180706

RIC1 Information provided on ipc code assigned before grant

Ipc: H01S 3/083 20060101AFI20030730BHEP

Ipc: G01B 9/02 20060101ALI20030730BHEP

Ipc: G02F 1/11 20060101ALI20030730BHEP

Ipc: H01S 3/067 20060101ALI20030730BHEP