WO2006067101A1 - Source laser a recombinaison coherente de faisceaux - Google Patents
Source laser a recombinaison coherente de faisceaux Download PDFInfo
- Publication number
- WO2006067101A1 WO2006067101A1 PCT/EP2005/056893 EP2005056893W WO2006067101A1 WO 2006067101 A1 WO2006067101 A1 WO 2006067101A1 EP 2005056893 W EP2005056893 W EP 2005056893W WO 2006067101 A1 WO2006067101 A1 WO 2006067101A1
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- WO
- WIPO (PCT)
- Prior art keywords
- laser source
- source according
- polarization
- phase
- laser
- Prior art date
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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
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors
-
- 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
- H01S3/06754—Fibre amplifiers
-
- 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
- H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
- H01S3/2383—Parallel arrangements
Definitions
- the present invention relates to a laser source with coherent recombination of laser beams.
- the coherent recombination of N elementary laser beams consists of summing N coherent beams (or N * Q, in a two-dimensional organization) that have each been propagated through a single-mode space propagation medium.
- This coherent recombination makes it possible to respond to applications that require a laser beam of high luminance, but also of great coherence, and of high optical quality (limited by diffraction).
- fiber laser power sources are thus produced.
- the invention relates to laser sources using spatial single-mode propagation media, for example monomode fibers.
- the optical beam quality is preserved during the recombination.
- the field of application of such laser sources is vast. These include telemetry, designation, active imaging, pointing, free space communications, including space communications, with the possibility of deflecting the laser beam or correcting atmospheric disturbances.
- a beam recombination laser source comprises, in a known manner, a plurality of space-operated monomode propagation media arranged in parallel. In the case of a power laser source, the propagation media are gain media. In this way, the amplification necessary for the supply of a high-power beam is distributed over N gain mediums, which makes it possible to exceed the limits of non-linearity and flux resistance of a single gain medium. .
- the coherent recombination of the amplified beams at the output of the gain mediums makes it possible to obtain a beam whose luminance is increased in the ratio of the square of the number of amplified beams, relative to the luminance of a single amplified beam. In addition, the resulting beam retains as property (optical quality), to be limited by diffraction.
- the coherent recombination of beams at the output of N fiber amplifiers, or more generally at the output of N propagation media imposes phasing and polarization conditions on the N output beams. The phasing conditions are determined to allow constructive interference of the N beams, to obtain maximum output luminance, or deflection of the main beam of the output beam (optical phase scan antenna), or correction of different disturbances. : effects of vibration, temperature, mechanical stress or other.
- the coherent recombination of beams supposing the adjustment of the phase, for each beam, a phase correction device is provided on each channel.
- adaptive phase correction techniques are used, by means of correction devices such as electro-optical elements (LiNbO3 or space modulators of liquid crystal light), or piezoelectric devices. electric (fiber wrapped around a piezoelectric element).
- correction devices such as electro-optical elements (LiNbO3 or space modulators of liquid crystal light), or piezoelectric devices. electric (fiber wrapped around a piezoelectric element).
- accousto-optical modulators as described, for example, in the publication "Coherent beam combining and phase noise measurements of ytterbium fiber amplifiers", by MM. Augst, Fan and Sanchez, Optics Letters, Vol.29, No. 5, March 1, 2004.
- a fiber laser source is particularly described which comprises two amplifying fibers, which are Yb (Ytterbium) doped fibers.
- the laser source comprises an accousto-optical modulator (Bragg cell) for each amplifying channel.
- the modulator makes it possible to control the phase, in order to allow the coherent
- each of the beams be controlled at the output of each of the media, in order to make the coherent combination, ie to make the interferences perfectly constructive.
- An object of the invention is a laser source with coherent recombination of beams which does not have the various aforementioned disadvantages.
- An object of the invention is a beam recombination laser source without power limitation.
- a coherent beam recombination laser source comprises a phase control element and an input bias element of each propagation medium, and a servo control loop of said elements according to the output characteristics.
- the invention thus relates to a laser source comprising N laser beams, N at least equal to two, N monomode spatial propagation media of a beam, each forming a path for a laser beam, a coherent recombination system at the output of the N channels.
- a phase control device comprising N closed-loop servo-controlled programmable phase shifter elements, an input of each channel, characterized in that the source further comprises a polarization control device comprising N closed loop controllable bias polarization controllers, one per channel, each controller being disposed between the phase shifter element and the associated channel.
- FIG. 1 is a general diagram of a power laser source according to the invention
- FIG. 2 is a general diagram of a power laser source according to another embodiment of the invention.
- FIG. 3 schematically represents the effect of a non-depolarizing medium on the polarization state of a laser beam
- FIG. 4 schematically represents the effects of a phase-shifter and a polarization controller according to the invention
- FIGS. 5a to 5c show a polarization control element that can be used in a laser source according to the invention
- FIGS. 6a to 6c show a programmable phase shifting element that can be used in a laser source according to the invention
- FIGS. 7a and 7b show an alternative embodiment of the programmable phase shifting element of FIGS. 6a to 6c;
- FIGS. 8a and 8b illustrate a programmable component for phase correction and polarization control, which can be used in a laser source according to the invention.
- Figure 1 is a general diagram of a laser source according to the invention.
- This source comprises N channels g of spatial monomode propagation, a system 1 for coherent recombination, ensuring coherent recombination of the N laser beams in the output g of the N channels, to provide a recombinant fR laser beam output.
- the coherent recombination system comprises a device 2 for reshaping the beams (for example, a microlens array, in an example of coherent recombination of the free space beams).
- Each path g receives an incident laser beam ⁇ .
- the N incident beams I are in any state of polarization, and have between them any phase shift.
- the laser source comprises a phase shifter d and a polarization controller p, arranged in cascade, at the input of each propagation path g.
- the N phase shifters d are made in the same component D in a matrix form with 1 or 2 dimensions.
- the N polarization controllers p are made in the same component P in a matrix form with 1 or 2 dimensions.
- Each of the phase shifters d and each of the polarization controllers p is slaved in a closed loop by a feedback signal which reflects the efficiency of the phasing and polarization of the N beams at the output of the g channels.
- the propagation paths are preferably amplifying fibers. These fibers are not necessarily polarization-maintaining, which reduces the cost of the source.
- the phase control and the polarization control according to the invention are separable functions. This makes it possible to envisage several embodiments of closed-loop servocontrol in a laser source according to the invention.
- the phase and polarization servocontrol is carried out in a common manner.
- Such an embodiment can advantageously be implemented when the state of polarization of the recombined output beam can be arbitrary.
- the optimal recombination condition is reached when all the beams are in the same state of polarization at the output.
- We can then implement a servo based on the detection of the optimal recombination condition, typically, obtaining an optimum intensity on the central lobe of the recombined beam. In this case, and as illustrated in FIG.
- the output device 1 integrates a servo control module 3, which may for example comprise a device for measuring the intensity of the central lobe of the recombined laser beam fR, and means digital processing using a phased and polarized servocontrol algorithm, parameterized to obtain a maximum intensity.
- a servo control module 3 may for example comprise a device for measuring the intensity of the central lobe of the recombined laser beam fR, and means digital processing using a phased and polarized servocontrol algorithm, parameterized to obtain a maximum intensity.
- Each phase shifter element and polarization controller receives a clean feedback signal that results from this servocontrol.
- the phase counter-reaction and the polarization feedback are performed by separate control loops.
- Each function, phase control and polarization control then has its own feedback device, each implementing a proper servocontrol algorithm.
- the polarization servocontrol loop is performed on each channel g, by means of a servo-control device 5, arranged at the output.
- This device 5 comprises a polarization measuring device (polarimeter, or polarizer and photodiode for example) of a fraction of the output signal, to produce a signal of counter-reaction S p for the associated polarization controller p, with reference to an expected output polarization state.
- the phase control loop is typically performed in the output device by means of a wavefront analyzer 6 on the recombined beam fR.
- the phase control loop can be performed on each channel g. This can be particularly the case when one seeks to obtain a "phase ramp" on the N beams output.
- the device for controlling the phase may use a reference phase R. This may for example be the phase of one of the N beams, or a phase external reference.
- the phase and polarization servocontrol according to the invention makes it possible in particular to produce a power laser source.
- the slaving is carried out so that at the output of the g channels, the N amplified laser beams are in phase (zero delay modulo 2 ⁇ ) and have the same state of polarization.
- the parameters of the servo may be different.
- the slaving is performed to impose a phase shift ramp between the output beams.
- FIG. 3 generally represents the effect of a medium g t on the polarization state of a laser beam.
- This Jones matrix of the medium g reflects the modification of the state of polarization of the light, with complex coefficients m'u ... m'22 and the phase shift, by the term ⁇ /.
- the beam at the output of the medium g be in a state of polarization p ' out given.
- the output polarization state is checked.
- phase shift ⁇ induced by the medium must also be controlled. It is this principle that is used in the invention.
- two optical elements are cascaded: a phase shifter di and a polarization controller pi, at the input of each channel g ,.
- the phase shifter d1 associated with a channel g (the propagation medium), generates a delay on this path g ,, to compensate for the delay ⁇ , caused by this channel g, the incident relative delay with the other channels, g i + i, g i + 2 , ... and the delay caused by the polarization controller pi.
- the polarization controller pi associated with the path g transforms the state of incident polarization P ' in a state of polarization P' s which will give, after propagation in the medium g ,, the desired state of polarization P ' or t (vertical polarization in Figure 4).
- the two elements di and Pi are used in a closed-loop system with a control servo of N di-phase-shifting elements and N pi-polarization controllers by an associated feedback signal sdi or spi, by means of a control device. measurement and an appropriate algorithm. It is shown that the recombined beam obtained at the output has characteristics that reflect the effectiveness of the phasing and polarization according to the invention.
- the di phase shifters and / or pi phase controllers can be made by any programmable device of the state of the art, and in particular by electro-optical devices (LiNbO 3 , liquid crystal device), or others.
- the phase-shifting elements can also be accousto-optical elements (Bragg cells).
- it is intended to use as polarization controller, an electro-optical controller as described in particular in patent FR 0215994, entitled "Device for dynamically controlling the polarization of an optical wave and method of manufacturing
- Such a device in particular, has the advantage of being very effective, of limiting insertion losses, of having a very short response time and a good compactness.
- the electrodes are through metallized holes through the entire thickness of the blade. In this case, it is necessary to provide an electrically insulating blade 11 between the two blades 10 and
- This blade is typically a silica blade (or a material of low dielectric constant).
- Each blade with variable birefringence and orientable neutral axis is made of an electro-optical material with variable birefringence and neutral axis which can be steered under the effect of an electric field whose amplitude and / or orientation is modified by means of a set of at least three electrodes.
- the blade 10 thus comprises in the example four electrodes ⁇ ⁇ , V 2 , V 3 and V 4 .
- the blade 12 comprises four electrodes V'i, V 2 , V 3 and V 4 .
- the blades are arranged as illustrated in the figure.
- an electro-optical material is a PLZT ceramic
- V ⁇ necessary to obtain a phase shift of ⁇ in each of the plates
- d is the inter-electrode distance (typically of the order of 100 .mu.m)
- e is the thickness of the blade (typically of the order of 500 microns)
- n 0 the index of the PLZT (2.4)
- R electro-optical 3.10 "16 mV 2 ).
- the response time of such a component is of the order of one microsecond, which makes it possible to compensate polarization fluctuations of several hundred kiloHertz (in accordance with the needs of the application).
- Such a polarization controller therefore introduces a related phase shift
- phase shift which is taken into account in the phase control function according to the invention.
- a similar component is used to produce the phase-shifting elements.
- a phase-shifting element di is produced by means of two variable birefringence blades and fixed neutral axes, 20 and 22, each comprising a set of two electrodes, V 5 , V 6 , respectively V 5 , V 6 , and whose axes optics are crossed.
- the two blades are arranged so that their electrode sets are at 90 degrees relative to each other.
- the electrodes are made by oblong metallized holes in the thickness of the blade.
- the holes are open.
- a blade 21 of a material with a low dielectric constant, typically a silica plate is provided between two cascaded blades, to isolate their respective electrodes.
- phase shifter makes it possible to provide the desired control function in a laser source according to the invention, whatever the incident polarization state of the N beams.
- the phase shifter di performs the phase shift function isotropically: the applied phase shift is identical regardless of the incident polarization state.
- phase shifter d ⁇ illustrated in Figures 6a to 6c can be made in a similar manner to the polarization controller as described in the aforementioned French patent. More particularly, the following steps can be provided:
- the two one-dimensional phase-shift blades 20 and 22 are produced by machining on 2 substrates 2 parallel oblong holes (by femtosecond or ultrasonic laser machining).
- the holes are metallized (substrates fully metallized, then polished).
- an air / PLZT antireflection treatment is applied to one face of each substrate and anti-reflection PLZT / glass on the other side.
- the air / PLZT treatment ensures the double function of insulating electric contact tracks and ceramic (parasitic capacitive effect), and minimizing reflection losses and standard effect.
- PLZT / glass ensures a good interfacing of each of the PLZT 20 blades
- the contact tracks are made to deposit the control voltages up to the machined electrodes.
- the assembly is carried out: the two ceramic blades are placed so that their sets of oblong holes are centered and arranged relative to each other in a perpendicular manner and the blade of glass 21 is inserted between these two blades 20 and 22.
- d is the distance between the electrodes (typically 100 ⁇ m), e the thickness of each plate (typically 500 ⁇ m), n 0 the PLZT index (2.4), and R the electro-optical coefficient of the ceramic (3.10 "16 mV 2 )
- FIGS. 7a and 7b illustrate an alternative embodiment of a phase shifter according to the invention, which is simpler to produce, and which is suitable in the case where the incident laser beams all have the same linear polarization.
- variable birefringence plate of 0 to 2 ⁇ and fixed axis parallel to the polarization axis of the incident beams.
- This blade will be chosen greater thickness e than in the case of Figures 6a to 6c, to ensure the phase shift of 2 ⁇ , typically the double. It will be anti-reflective air / PLZT on both sides, as indicated previously. It comprises a set of two electrodes V 7 , V 8 , made as before, by two oblong holes, metallized in the thickness of the blade.
- Another variant of the play of the two electrodes of a phase shift plate may be provided.
- phase shifter element comprises a single blade. It advantageously leads directly to a matrix version of the component as illustrated in FIG. 7b, in the case of a one-dimensional matrix.
- two parallel trenches 31 and 32 are hollowed into the thickness of the plate in the thickness of the substrate, using a circular saw.
- the inside of these trenches is then selectively metallized by masking, to produce the electrodes V 7 and V 8 , the first electrode V 7 in a trench, the trench 32 in the example, and the second electrode V 8 in the trench.
- the phase shifters dj, d i + i are thus produced along the trench axis, while the direction of propagation of the beams incident on each element follows an axis q, q + i perpendicular to the trench. Note that the electrodes do not open on both sides of the blade.
- d is the distance between the electrodes (typically 100 ⁇ m), e the thickness of the plate, n 0 the index of the PLZT (2.4), and R the electro-optical coefficient of the ceramic (3.10 "16 mV 2 ). Double thickness of that of the previous case, we obtain the same maximum control voltage, less than 100 Volts.
- Figures 8a and 8b illustrate an integrated "monolithic" phase control and polarization component which can then be advantageously used in the invention.
- the two blades 20 and 22 of the phase-shifter are cascaded, with the two blades 10 and 12 of the polarizer, providing, if appropriate, silica plates 1 1, 13 and 21 between (case of holes through-).
- the blade 30 of the phase shifter is cascaded, with the two blades 10 and 12 of the polarizer, providing, if appropriate (through holes), a silica plate 1 1 between the two blades 10 and 12 of the polarization controller.
- this component can advantageously be made in matrix form.
- a phase-shifting element is inputted, in the example di cascade on a polarization control element, in the example pi.
- An isotropic phase shifter is then obtained by cascading two uniaxial phase shifters.
- An isotropic phase shifter can also be directly produced using liquid crystal nanodropage technology.
- the invention which has just been described is still of interest in a polarization-maintaining fiber system. Indeed, such systems assume that the incident extinction rate on the fiber is high and that the polarization is well aligned in the axis of the fiber, so that the polarization is maintained. If this is not the case, it occurs during the propagation of the couplings of the desired polarization state to the other state of polarization of the fiber. However the state of the art in terms of connections makes it difficult to exceed the 25 dB extinction while some applications require 30 or 35 dB. In addition, if the fiber undergoes strong environmental disturbances such as vibrations or stresses, a drop in the extinction rate is observed.
- a polarization controller according to the invention to such a system then makes it possible to obtain a very good rate of incident extinction on the fiber, and to well orient it on the axis of the fiber. Even if the fiber maintains the polarization under favorable environmental conditions, the controller makes it possible to correct the more severe disturbances due to the vibrations and the stresses exerted on the fiber: one can say that the fiber ensures a maintenance "gross" of the polarization whereas the polarization controller finely corrects the residual variations, which makes it possible to reach higher extension rates in a harsh environment.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05826432A EP1829172A1 (fr) | 2004-12-23 | 2005-12-19 | Source laser a recombinaison coherente de faisceaux |
US11/722,676 US20080055700A1 (en) | 2004-12-23 | 2005-12-19 | Laser Source Using Coherent Beam Recombination |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0413838 | 2004-12-23 | ||
FR0413838A FR2880204B1 (fr) | 2004-12-23 | 2004-12-23 | Source laser a recombinaison coherente de faisceaux |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006067101A1 true WO2006067101A1 (fr) | 2006-06-29 |
Family
ID=34954474
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2005/056893 WO2006067101A1 (fr) | 2004-12-23 | 2005-12-19 | Source laser a recombinaison coherente de faisceaux |
Country Status (4)
Country | Link |
---|---|
US (1) | US20080055700A1 (fr) |
EP (1) | EP1829172A1 (fr) |
FR (1) | FR2880204B1 (fr) |
WO (1) | WO2006067101A1 (fr) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2889774B1 (fr) * | 2005-08-12 | 2009-10-16 | Thales Sa | Source laser a recombinaison coherente de faisceaux |
FR2901923B1 (fr) * | 2006-05-30 | 2009-11-20 | Thales Sa | Source laser pour application lidar |
FR2907547B1 (fr) * | 2006-10-20 | 2009-04-17 | Thales Sa | Systeme d'imagerie polarimetrique a matrice de lames d'onde programmables a base de materiau avec un tenseur electro-optique isotrope. |
FR2932929B1 (fr) * | 2008-06-20 | 2010-06-04 | Thales Sa | Dispositif laser comportant des moyens de mise en phase d'un grand nombre de sources coherentes |
FR2945348B1 (fr) | 2009-05-07 | 2011-05-13 | Thales Sa | Procede d'identification d'une scene a partir d'images polarisees multi longueurs d'onde |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5694408A (en) * | 1995-06-07 | 1997-12-02 | Mcdonnell Douglas Corporation | Fiber optic laser system and associated lasing method |
EP0980123A2 (fr) * | 1998-08-11 | 2000-02-16 | TRW Inc. | Système laser à fibre à puissance moyenne élevée avec commande de la phase du front |
US20030099439A1 (en) * | 2001-11-16 | 2003-05-29 | Hrl Laboratories, Llc | Coherent power combining of single-mode sources in waveguide fiber couplers |
FR2848684A1 (fr) * | 2002-12-17 | 2004-06-18 | Thales Sa | Dispositif de controle dynamique de la polarisation d'une onde optique et procede de fabrication du dispositif |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
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FR2659754B1 (fr) * | 1990-03-16 | 1994-03-25 | Thomson Csf | Dispositif de creation de retards optiques et application a un systeme de commande optique d'une antenne a balayage. |
FR2674391B1 (fr) * | 1991-03-19 | 1993-06-04 | Thomson Csf | Dispositif d'intercorrelation large bande et dispositif mettant en óoeuvre ce procede. |
FR2674708B1 (fr) * | 1991-03-29 | 1997-01-24 | Thomson Csf | Filtre transverse electrique a fonctionnement optique. |
GB2255193B (en) * | 1991-04-24 | 1994-10-12 | Marconi Gec Ltd | Optical device |
FR2681953B1 (fr) * | 1991-10-01 | 1993-11-05 | Thomson Csf | Correlateur de frequences. |
FR2699295B1 (fr) * | 1992-12-15 | 1995-01-06 | Thomson Csf | Dispositif de traitement optique de signaux électriques. |
EP0757848A1 (fr) * | 1995-02-24 | 1997-02-12 | Thomson Csf | Dephaseur hyperfrequence et application a une antenne reseaux |
US5535463A (en) * | 1995-03-01 | 1996-07-16 | Chiu; K. Jung | Water bed with peripheral air tube |
FR2769154B1 (fr) * | 1997-09-30 | 1999-12-03 | Thomson Csf | Dispositif de synchronisation precise |
FR2779579B1 (fr) * | 1998-06-09 | 2000-08-25 | Thomson Csf | Dispositif de commande optique pour l'emission et la reception d'un radar large bande |
US6317257B1 (en) * | 2000-04-20 | 2001-11-13 | Trw Inc. | Technique for polarization locking optical outputs |
US6400871B1 (en) * | 2000-05-19 | 2002-06-04 | Hrl Laboratories, Llc | Phase control mechanism for coherent fiber amplifier arrays |
FR2811485B1 (fr) * | 2000-07-07 | 2002-10-11 | Thomson Csf | Laser a fibre de puissance a conversion de mode |
US6766082B2 (en) * | 2000-10-18 | 2004-07-20 | Nippon Telegraph And Telephone Corporation | Waveguide-type optical device and manufacturing method therefor |
US7088743B2 (en) * | 2004-03-15 | 2006-08-08 | Northrop Grumman Corp. | Laser source comprising amplifier and adaptive wavefront/polarization driver |
-
2004
- 2004-12-23 FR FR0413838A patent/FR2880204B1/fr active Active
-
2005
- 2005-12-19 EP EP05826432A patent/EP1829172A1/fr not_active Withdrawn
- 2005-12-19 US US11/722,676 patent/US20080055700A1/en not_active Abandoned
- 2005-12-19 WO PCT/EP2005/056893 patent/WO2006067101A1/fr active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5694408A (en) * | 1995-06-07 | 1997-12-02 | Mcdonnell Douglas Corporation | Fiber optic laser system and associated lasing method |
EP0980123A2 (fr) * | 1998-08-11 | 2000-02-16 | TRW Inc. | Système laser à fibre à puissance moyenne élevée avec commande de la phase du front |
US20030099439A1 (en) * | 2001-11-16 | 2003-05-29 | Hrl Laboratories, Llc | Coherent power combining of single-mode sources in waveguide fiber couplers |
FR2848684A1 (fr) * | 2002-12-17 | 2004-06-18 | Thales Sa | Dispositif de controle dynamique de la polarisation d'une onde optique et procede de fabrication du dispositif |
Non-Patent Citations (1)
Title |
---|
See also references of EP1829172A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2880204B1 (fr) | 2007-02-09 |
US20080055700A1 (en) | 2008-03-06 |
EP1829172A1 (fr) | 2007-09-05 |
FR2880204A1 (fr) | 2006-06-30 |
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