WO2003055016A2 - Dispositif d'amplification et de mise en phase pour sources laser de puissance - Google Patents
Dispositif d'amplification et de mise en phase pour sources laser de puissance Download PDFInfo
- Publication number
- WO2003055016A2 WO2003055016A2 PCT/FR2002/004399 FR0204399W WO03055016A2 WO 2003055016 A2 WO2003055016 A2 WO 2003055016A2 FR 0204399 W FR0204399 W FR 0204399W WO 03055016 A2 WO03055016 A2 WO 03055016A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- optical fibers
- amplifying
- output
- spatial
- followed
- Prior art date
Links
- 239000013307 optical fiber Substances 0.000 claims abstract description 29
- 239000006185 dispersion Substances 0.000 claims abstract description 7
- 238000005070 sampling Methods 0.000 claims abstract description 3
- 239000011159 matrix material Substances 0.000 claims description 14
- 230000003321 amplification Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims description 2
- 239000000835 fiber Substances 0.000 description 16
- 229910052691 Erbium Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 2
- 108010072959 Fibrel Proteins 0.000 description 1
- 229910052769 Ytterbium Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 1
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
- H01S3/05—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
- H01S3/10—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
- H01S3/1003—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 tunable optical elements, e.g. acousto-optic filters, tunable gratings
-
- 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 an amplification and phasing device for laser power sources.
- the present invention relates to an amplification and phasing device for power laser sources which can deliver powers of at least 500W, and even much more, device which, without being too expensive, is easy to use , the least bulky possible and does not disturb the qualities of the laser beam which it amplifies.
- the device comprises, at the output of a laser source to be amplified, a spatial dispersion device followed by N amplifying optical fibers, N being a function of the relative gain sought for the amplifier device and of the gain of the optical fibers, a signal sampling device at the output of each of these optical fibers followed by a wavefront analyzer and phase correction device connected to a spatial modulator interposed between the dispersive device and the inputs of the N optical fibers.
- FIG. 1 is a block diagram of an amplifier device according to the invention
- FIG. 2 is a simplified view at the end of the set of amplifying optical fibers, aligned on a single line, of the device of FIG. 1,
- FIG. 3 is a simplified view at the end of the set of optical fibers, arranged in a rectangular matrix, of the device of FIG. 1, and • Figure 4 is a partial and simplified view of a variant of the device of Figure 1.
- An optical fiber 1 which is the output fiber of a conventional laser oscillator (not shown) of power (of a few Watts or a few tens of Watts, for example) with doped optical fiber, lights up a spatial dispersion device 2.
- a semi-reflecting mirror 3 is interposed between the output of the fiber 1 and the device 2. This mirror 3 takes a small part of the laser beam leaving the fiber 1 and sends it to an optical fiber 4.
- the N beams are taken up by an array of micro-lenses 5, the object focal plane of which is coincident with the output face of the device 2, and sent over N amplifying optical fibers referenced 6 as a whole.
- These N beams advantageously all having the same power, are either regularly aligned in a single line, or arranged in rows and columns to form a rectangular matrix.
- the arrangement of the entry faces of the fibers of the assembly 6 corresponds, of course, to that of the beams taken up by the micro-lens matrix 5.
- These entry faces are either aligned on a single line (see in FIG.
- the arrangement L of the input faces F1 to FN of the N fibers of the set 6, in the case where the N bundles are aligned), or arranged in a rectangular matrix configuration in rows and columns (see in FIG. 3 the matrix arrangement M input faces F1.1 to FK.H for a matrix with H rows and K columns, with KH N)
- the matrix 6A is followed by a separating blade 9 at 45 ° and a spherical lens 7 focusing the output beam on a single output optical fiber 8.
- the blade 9 takes a small part of the corresponding beams (a few percent).
- This plate 9 is arranged so that the beams which it reflects are all directed towards a wavefront analyzer 10 (shift interferometer, for example).
- the analyzer 10 possibly receives a reference beam arriving via optical fiber 4.
- the output of the analyzer 10 is connected to a spatial modulator 11 interposed between the matrix of mirrors 5 and the fiber inputs 6.
- This modulator 11 is, in the present case, a liquid crystal screen operating in transmission. Its shape and dimensions correspond to those of the entry face of the fiber assembly 6, that is to say it is either "one-dimensional" (as shown in FIG. 2), or rectangular (as shown in figure 3).
- the device described above operates in the following manner.
- the input beam, at relatively low power (a few tens of Watts at most), arriving by the optical fiber 1, is divided into N beams each sent on a corresponding fiber of the set 6.
- Each of the N fibers amplifies the beam that it receives, and at the output of the set 6 we obtain N beams whose sum of individual powers can amount to a few hundred Watts, or even a few kilowatts, depending on the number N of optical fibers and their gain .
- the wave fronts of these N beams are arbitrary with respect to each other (in particular due to the different phase shifts introduced by the device 2 and dispersions of characteristics of the fibers of the assembly 6).
- the invention provides for the use of a phase control device.
- This servo device comprises the separating blade 9 taking a small part of the output beam from each of the fibers 6, which is sent to the analyzer 10.
- This analyzer can receive, as a relative phase reference, a beam coming from the oscillator supplying the fiber 1. This beam can be sampled by a mirror 3, as shown in FIG. 1, or else be sampled directly in the oscillator.
- the analyzer 10 sends electrical correction signals to each of the cells of the spatial modulator 11, in order to more or less delay the wave fronts of the different beams which reach it from the matrix 5, so that at the output of the 'set of optical fibers 6 all the wave fronts of the different beams are in phase.
- the spatial modulateru 11 is arranged upstream of the amplifying fibers 6, it is only subjected to a low power, and is not likely to be damaged by overexposure to a power optical beam.
- the device 2 can be of the reflection type.
- the spatial modulator 11 can be of the reflection type.
- the holographic device 2 and the lens 5 are replaced by a telescope 12 and a matrix 13 of microlenses, the spatial modulator 11 being disposed between the telescope 12 and the matrix 13.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2002364454A AU2002364454A1 (en) | 2001-12-21 | 2002-12-17 | Amplifying and phasing device for power laser sources |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR01/16696 | 2001-12-21 | ||
FR0116696A FR2834136A1 (fr) | 2001-12-21 | 2001-12-21 | Dispositif d'amplification et de mise en phase pour sources laser de puissance |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2003055016A2 true WO2003055016A2 (fr) | 2003-07-03 |
WO2003055016A3 WO2003055016A3 (fr) | 2004-02-12 |
Family
ID=8870857
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2002/004399 WO2003055016A2 (fr) | 2001-12-21 | 2002-12-17 | Dispositif d'amplification et de mise en phase pour sources laser de puissance |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU2002364454A1 (fr) |
FR (1) | FR2834136A1 (fr) |
WO (1) | WO2003055016A2 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7088743B2 (en) * | 2004-03-15 | 2006-08-08 | Northrop Grumman Corp. | Laser source comprising amplifier and adaptive wavefront/polarization driver |
EP2051343A1 (fr) * | 2007-10-16 | 2009-04-22 | LFK-Lenkflugkörpersysteme GmbH | Ensemble laser à fibre à haute puissance |
US20090316734A1 (en) * | 2008-06-20 | 2009-12-24 | Thales | Laser Device Comprising Means for Controlling the Phase of a Large Number of Coherent Sources |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7120175B2 (en) * | 2004-01-20 | 2006-10-10 | Northrop Grumman Corporation | Scalable harmonic laser source and method |
Family Cites Families (2)
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 |
IL130904A (en) * | 1998-08-11 | 2004-07-25 | Trw Inc | Fiber laser system with high average power with phase front control |
-
2001
- 2001-12-21 FR FR0116696A patent/FR2834136A1/fr active Pending
-
2002
- 2002-12-17 AU AU2002364454A patent/AU2002364454A1/en not_active Abandoned
- 2002-12-17 WO PCT/FR2002/004399 patent/WO2003055016A2/fr not_active Application Discontinuation
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7088743B2 (en) * | 2004-03-15 | 2006-08-08 | Northrop Grumman Corp. | Laser source comprising amplifier and adaptive wavefront/polarization driver |
EP2051343A1 (fr) * | 2007-10-16 | 2009-04-22 | LFK-Lenkflugkörpersysteme GmbH | Ensemble laser à fibre à haute puissance |
US20090316734A1 (en) * | 2008-06-20 | 2009-12-24 | Thales | Laser Device Comprising Means for Controlling the Phase of a Large Number of Coherent Sources |
US8767289B2 (en) * | 2008-06-20 | 2014-07-01 | Thales | Laser device comprising means for controlling the phase of a large number of coherent sources |
Also Published As
Publication number | Publication date |
---|---|
AU2002364454A8 (en) | 2003-07-09 |
WO2003055016A3 (fr) | 2004-02-12 |
FR2834136A1 (fr) | 2003-06-27 |
AU2002364454A1 (en) | 2003-07-09 |
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