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WO2008074359A1 - Laser à fibre optique - Google Patents

Laser à fibre optique Download PDF

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Publication number
WO2008074359A1
WO2008074359A1 PCT/EP2006/012641 EP2006012641W WO2008074359A1 WO 2008074359 A1 WO2008074359 A1 WO 2008074359A1 EP 2006012641 W EP2006012641 W EP 2006012641W WO 2008074359 A1 WO2008074359 A1 WO 2008074359A1
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WO
WIPO (PCT)
Prior art keywords
fibre
mode
cavity
fiber
lma
Prior art date
Application number
PCT/EP2006/012641
Other languages
English (en)
Inventor
Bülend ORTAC
Jens Limpert
Andreas Tünnemann
Original Assignee
Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V:
Friedrich-Schiller-Universität
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 Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V:, Friedrich-Schiller-Universität filed Critical Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V:
Priority to PCT/EP2006/012641 priority Critical patent/WO2008074359A1/fr
Publication of WO2008074359A1 publication Critical patent/WO2008074359A1/fr

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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
    • H01S3/05—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
    • H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre 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
    • H01S2301/00—Functional characteristics
    • H01S2301/08—Generation of pulses with special temporal shape or frequency spectrum
    • H01S2301/085—Generation of pulses with special temporal shape or frequency spectrum solitons
    • 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
    • H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
    • H01S3/06712—Polarising fibre; Polariser
    • 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
    • H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
    • H01S3/06729—Peculiar transverse fibre profile
    • 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
    • H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
    • H01S3/06729—Peculiar transverse fibre profile
    • H01S3/06741—Photonic crystal fibre, i.e. the fibre having a photonic bandgap
    • 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
    • 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
    • H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
    • H01S3/1106—Mode locking
    • H01S3/1109—Active mode locking
    • 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
    • H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
    • H01S3/1106—Mode locking
    • H01S3/1112—Passive mode locking
    • H01S3/1115—Passive mode locking using intracavity saturable absorbers
    • H01S3/1118—Semiconductor saturable absorbers, e.g. semiconductor saturable absorber mirrors [SESAMs]; Solid-state saturable absorbers, e.g. carbon nanotube [CNT] based

Definitions

  • the invention relates to an optical fibre laser for the generation of ultra-short pulses.
  • Fibre lasers for the generation of ultra-short pulses using an optical fibre for amplification are, in principle, well known.
  • fibre lasers are well suited for ultrafast applications, especially in a range from picoseconds to femtoseconds.
  • mode- locked fibre lasers offer a number of advantages, like having a large amplification bandwidth supporting ultrashort pulses, an improved stability, freedom of misalignment and a dif- fraction limited beam.
  • they allow compact designs with inexpensive components, and are suited for high-average-power applications, because their geometry leads to efficient heat dissipation.
  • high-energy and high-average-power femtosecond lasers are interesting for many applications, including scientific instrumentation, industrial material processing, imaging, medical and mili- tary technologies.
  • the peak power is limited because of the small fibre size and the nonlinearity due to such a small fibre core.
  • the other output power limitation of a single-clad fibre laser is that, if being used for generating single mode pulses, only single mode pumping is possible.
  • Double-clad fibre technologies allow multimode pumping and propagation through an inner cladding of the fibre, while a single mode doped core provides absorption and single mode propagation of the laser pulse with a high launching efficiency thus preserving a compact configuration.
  • the pulse energy in the mode-locked double-clad laser is limited by a large length of the gain fibre, small fibre core, overdriving etc., and therefore not exceeding an energy per pulse more than 1OnJ.
  • MM multimode
  • US-patent 6 275 512 The other approach to decrease the nonlinearity in a small fibre core and generate high-power ultrashort pulses is to use a multimode (MM) -fibre as a gain medium, see US-patent 6 275 512.
  • MM multimode
  • a stable operation of a passively mode- locked MM- fibre laser can be obtained under certain conditions, but which however eventually limit the maximum output power.
  • all mode-coupling should be minimized.
  • Single-mode fibres are spliced at both ends of the MM-fibre for preserving single- mode propagation.
  • small satellite pulses may occur leading to a poor quality of the output pulses.
  • the performance of power scaling of this fibre source is not much higher than the performance of other mode-locked fibre lasers.
  • the object of the invention is to provide a fibre laser for generating ultrashort pulses with high pulse energy to overcome the limitations of the fibre lasers as described.
  • the fibre laser for generation of ultra-short pulses comprises a resonant cavity including a doped optical fibre as an amplifier medium and at least one dispersive element with anomalous group velocity dispersion (GVD) , the fibre and the at least one dispersion element being arranged in the optical path inside the laser cavity, whereby the optical fibre is a rare-earth-doped optical large-mode-area (LMA) -fibre having a normal GVD.
  • LMA optical large-mode-area
  • LMA photonic crystal fibre consists of a triangular array of air holes that have a diameter d and pitch L.
  • the air holes decrease the "average" refractive index of the cladding so that light is guided in the core by modified total internal reflection.
  • Large-mode-area PCF can be formed by this concept providing the single mode operation with mode- field-diameter of at least 10 ⁇ m.
  • the total GVD of the cavity is anomalous.
  • the cavity of the fibre laser is designed to work in the soliton- regime .
  • the idea of this invention is to demonstrate the new method to power scaling of the high-energy ultra-short pulse generation from fibre laser.
  • Soli- ton fibre lasers are built entirely from anomalous group velocity dispersion (GVD) fibre.
  • the pulse shape and duration are maintained through the combined action of negative GVD and Kerr nonlinearity.
  • the energy achievable in such laser systems is limited by the soliton area theorem.
  • the power scaling can be determined quantitatively between this invention and the other soliton mode fibre laser.
  • the other point is to demonstrate that this invention fibre laser is true mode-locked fibre lasers.
  • the LMA is a single-mode large-mode-area photonic crystal fibre.
  • Microstructuring the fibre adds several attractive properties to conventional fibres, offering signifi- cant power-scaling capabilities, in particular in single mode operation.
  • the gain medium of a fibre laser can be established by replacing the pure silica core by a rare-earth-doped rod.
  • a large-mode-area PCF can have more than one missing air hole providing the single mode operation.
  • an air-cladded region can be formed to create double-clad fibres.
  • pump light In a single-clad fibre, pump light must be coupled directly into the low-numerical-aperture core. In a double-clad laser, pump light can be more efficiently coupled into the high-numerical-aperture inner cladding.
  • the LMA-fibre is a single- polarization single-mode large-mode-area photonic crystal fibre (P-LMA) .
  • a P-LMA with an ultra-broadband single polarization window can be fabricated by including index-matched stress applying element in the inner cladding.
  • the resonant cavity further includes a saturable absorber for passive mode- locking.
  • a saturable absorber in particular, a semiconductor saturable absorber
  • passive mode locking and, in addition, self-starting pulse generation inside the cavity can be obtained.
  • Passive mode locking is preferred because of the capability to generate ultra-short pulses behind the picoseconds range, and, in addition, because of its simplicity, allowing a compact and rugged setup of the fibre laser.
  • the resonant cavity is configured as a sigma cavity.
  • the sigma cavity configuration consist two-parts.
  • the rare-earth-doped single-mode large-mode-area photonic crystal fibre is mounted in a unidirectional ring configuration.
  • the bulk polarization-dependent optical isolator inserted in the cavity plays the double- role of an isolator which ensures the unidirectional operation and a polarizer required for the output.
  • the Brillouin backscattering can be eliminated in a unidirectional operation, the semiconductor saturable absorber mirror works in reflection mode.
  • the linear segment of the sigma cavity configuration serves to use the saturable absorber mirror in reflection mode.
  • Fig. 1 is a schematic illustration of a first em- bodiment of the invention
  • Fig. 2 illustrates a rare-earth-doped single-mode large-mode-area air-clad photonic crystal fiber
  • Fig. 3 (a) and (b) shows a measured spectrum of pulses generated by the fiber oscillator of Fig. 1;
  • Fig. 4 (a) and (b) shows a measured autocorrelation of pulses generated by the fiber oscillator of Fig.
  • Fig. 5 illustrates a second embodiment of a linear cavity configuration including a chirped fiber Bragg grating as dispersion compensation and two Faraday rotators as environmentally stable fiber laser system;
  • Fig. 6 is a schematic illustration of a third embodiment in which active or active-passive mode- locking is used as mode- locking mechanism for including self-starting pulse generation;
  • Fig. 7 illustrates a fourth embodiment of an all- LMA fiber cavity configuration including a chirped fiber Bragg grating and a fiber pump coupler.
  • Fig. 1 illustrates a fibre comprising a passively mode-locked resonant laser cavity including a large- mode-area air-clad photonic crystal amplifying fiber in the optical path inside the cavity for generating high-energy ultra-short pulses.
  • the gain medium of the fiber laser is constituted by a rare-earth ion doping of the core of the microstructured fiber.
  • the cavity comprises a dichroic mirror Ml, a second total reflective mirror M2, a third polarization controller P3 , a polarizing isolator I, a second polarization controller P2, a first polarization controller Pl, a third dichroic mirror M3, a third lens L3 and a second lens L2, forming, in the given order, a closed loop, the fiber F being ar- ranged between the second lens L2 and third lens L3.
  • a fourth polarization controller P4 two gratings Gl and G2, a fourth lens L4 and a saturable absorber Sl are being arranged, in the given order, in the optical path of the cavity.
  • the fiber laser is mounted in a sigma cavity configuration (see D.J. Jones, L. E. Neslon, H. A. Haous, and E. P. Ippen, "Diode-pumped environmentally stable stretched-pulse fiber laser", IEEE Quantum Electron., vol. 3, no. 4, pp. 1076-1079 , 1007 and T. F. Caruthers, I.N. Duling, and M. L. Dennis, "Active-passive mode locking in a single- polarization erbium fiber laser," Electron. Lett., vol. 30, no. 13, pp. 1051-1053, 1004).
  • the loop in- eluding the fibre F is connected to the grating pair Gl, G2 and the semiconductor saturable absorber mirror Sl by a polarization-dependent optical isolator I.
  • the intra-cavity optical elements are aligned along the optical axis from Ol to 06.
  • FIG. 2 A cross section of the large-mode-area air-cald photonic crystal fiber used in this embodiment is shown in Fig. 2.
  • the fibre F comprises a core 1, surrounded by an inner cladding 3, and air cladding 4, an outer cladding 5, and a coating 6.
  • the ytterbium-doped core 1 of the fiber F is formed by seven missing air holes and has diameter of 23 ⁇ m.
  • the effective core NA (numerical aperture) is 0.03 and the fundamental mode-field-diameter is -30 ⁇ m (mode- field-area -1000 ⁇ m 2 ).
  • the inner cladding 3 has a di- ameter of 135 ⁇ m and a numerical aperture as high as 0.62 at 950 nm.
  • the pump light absorption of this structure is -13 dB/m at 976 nm.
  • the outer cladding 5 with a diameter of 445 ⁇ m is surrounded by the single layer acrylate coating 6.
  • the length of the fiber F inside the cavity is about 1.3 m.
  • the fiber ends are polished at an angle of 8° to eliminate parasite reflection into the fiber or sub-cavity effects.
  • the fiber laser is pumped from just one side by a high brightness semiconductor multi-mode fiber- coupled pump diode laser with an outside diameter of 200 ⁇ m and a NA of 0.22 operating at 976 nm.
  • the pump light is coupled directly into the low-numerical- aperture core of the fiber F by using telescope system based lens as Ll and L2.
  • the output beam is separated from the pump beam by a dichroic mirror Ml with high reflection of laser light (around 1030 nm) and high transmission of pumping light (976 nm) .
  • the dichroic mirror Ml is used at an angle of approximately 22° of optical axis 01.
  • the un-absorption pump light can be separated from the laser light by dichroic mirror M3 with high reflec- tion of pumping light (976 nm) and high transmission of laser light (1030 nm) arranged with an angle >0° to the optical axis 06.
  • the polarizing isolator I provides unidirectional op- eration inside the loop segment.
  • the reflected polarization of the polarization beam splitter of the isolator I serves as the output coupler.
  • the M 2 -value of the output laser beam is characterized to be 1.2, meaning a nearly diffraction- limited beam quality.
  • the output pulses are linearly polarized.
  • grating pairs Gl, G2 with 600 lines/mm at 1030 nm are inserted.
  • the gratings were setup Littrow-angle at about 18°.
  • a half-wave plate P4 introduced between the polarizing isolator I and the grating pair allows to control the additional loss of the grating pair system.
  • Passively mode locking is achieved through the semiconductor saturable absorber Sl.
  • the AR (antireflection) coated saturable absorber is based on a multi layer of GaAS/AlAs Bragg mirror and low temperature molecular beam epitaxy grown In GaAs quantum wells at the front side of the mirror.
  • the saturable absorber Sl has a high modulation depth with a recovery time in the picoseconds range.
  • the saturation threshold is achieved by using the focusing lens L4 being arranged directly after the dispersion compensation system.
  • Mode-locking is obtained by optimizing the saturation criteria of the saturable absorber and by using the advantage of non-linear polarization rotation by ad- justing the orientation of the intra-cavity polarization controllers Pl, P2 and P3 , based on wave-plates, to optimize the output pulse emission.
  • the cavity has a total roundtrip positive group velocity dispersion of -
  • the exemplary embodiment of Fig. 1 produces a series of pulses at about 53.33 MHz repetition rate with a average output of 880 mW at a wavelength of 1035 nm. Corresponding to a pulse energy of more than 16.5 nJ.
  • a typical optical spectrum obtained with this embodi- ment is shown in Fig. 3a and 3b.
  • the central wavelength is 1035 nm, and the corresponding optical spectrum bandwidth is -7.5 nm.
  • This optical spectrum shown in Fig. 3a and 3b was confirmed by the presence of the commonly observed spectral sideband due to periodic perturbations.
  • the autocorrelation trace ob- tained in the exemplary embodiment of Fig. 1 is presented in Fig.4a and 4b.
  • the autocorrelation width is 769 Fs, corresponding to a 493 fs pulse duration (assuming a sech 2 pulse shape) .
  • the second embodiment of the invention is illustrated in Fig. 5.
  • the cavity is mounted in a linear cavity design.
  • the cavity comprises chirped fibre Bragg gratings (CFBG), a fourth lens L4 , a polarization beam splitter B, two polarization controllers P2 and Pl , a second Faraday rotator FR2 , a third lens L3 , a P-LMA- fiber F, a second lens L2 , a dichroic mirror Ml, a first Faraday rotator FRl, a fifth lens F5, and a saturable absorber Sl .
  • the pump light of the pump is coupled into the cavity through a first lens Ll and the dichroic mirror Ml, as described in the first embodiment.
  • the Faraday rotators FRl and FR2 arranged at both sides of the fiber F, allow to compensate linear phase drifts between the polarization ei- genaxes of the fiber F, and thus provide a environ- mentally stable fiber laser configuration.
  • the output coupler is based on the polarization beam splitter B.
  • the output pulses are, there- fore, linearly polarized.
  • One of the linear cavity mirrors is the saturable absorber Sl, also used as mode- locking mechanism and for self-starting pulse generation.
  • the CFBG are used for intra-cavity dispersion compensation.
  • the grating period inside the fiber core can be mono- tonically varied to produce a chirped fiber Bragg grating.
  • CFBG may be combined with a LMA fiber by using different techniques with negative dispersion (for example, a phase-mask technique with femtosecond laser pulses) .
  • the CFBG is used as second mirror of the laser cavity.
  • active mode- locking technique in combi- nation with a passive mode-locking technique may be used to mode-lock a large-mode-area fiber laser system.
  • An active mode-locking element such as an amplitude or Frequency modulator can modulate intra-cavity loss to produce a series of pulses .
  • This technique can be combined with a passive mode- locking mechanism such as a non- linear polarization evolution to optimize the intra-cavity pulse evolution.
  • FIG. 6 A schematic illustration of a mode-locked large-mode- area fiber laser with an active mode- locking mechanism element AM is shown in Fig. 6.
  • the cavity comprises a dichroic mirror Ml, a first polarization controller Pl, a polarization-dependent optical isolator I, the active mode-locking element AM, a second total reflective mirror M2 , an element for dispersion management O 7 a third total reflective mirror M3 , a third polarization controller P3 , a second polarization controller P2, a lens L3 , a LMA-fiber F, and a second lens L2, arranged in the given order in an unidirectional ring cavity design.
  • Pump light is coupled through dichroic mirror Ml.
  • Passive mode- locking is achieved through non- linear polarization rotation technique .
  • Fig. 7 illustrates a fourth embodiment of an all -LMA fiber cavity configuration including a chirped fiber Bragg grating CFBG and a fiber pump coupler PC arranged in a linear design.
  • the multi-mode pump diode is being coupled in the amplifier fiber with fiber multiplexer (fiber pump coupler) PC, which allows both fiber ends to remain free and therefore permits to construct an all- fiber system.
  • a saturable absorber mirror Sl is directly butt-coupled to the fiber without the focusing lens optimizing the saturation threshold.
  • the fiber pigtailed coupler is used as output coupler allowing for a fiber based output.
  • further large-mode-area fiber-optical components can be added, such as couplers, isolators, circulators etc. to realize an all-fiber-system in various cavity configurations in particular in cavity configurations as mentioned above.
  • soliton pulse fiber lasers also, for example, stretched-pulse or self-similar pulse fiber lasers according to the invention can be realized with adequate dispersion-management inside the cavity.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Lasers (AREA)

Abstract

L'invention a trait à un laser à fibre permettant de générer des impulsions ultracourtes. Selon l'invention, le laser à fibre comprend une cavité résonnante qui inclut une fibre optique dopée (F) en tant que support d'amplificateur et au moins un élément dispersif (Gl, G2, D) ayant une dispersion de vitesse de groupe anomale (GVD), laquelle fibre (F) et lequel au moins un élément de dispersion (G1, G2, D) sont disposés sur le chemin optique à l'intérieur de la cavité du laser, ce qui fait que la fibre optique (F) est une fibre optique additionnée de terre rare de zone en mode large (LMA) ayant une GVD normale.
PCT/EP2006/012641 2006-12-21 2006-12-21 Laser à fibre optique WO2008074359A1 (fr)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013099448A1 (fr) * 2011-12-28 2013-07-04 株式会社日立ハイテクノロジーズ Dispositif de correction d'inspection, procédé de correction d'inspection, et laser à fibre optique
CN113466994A (zh) * 2021-07-13 2021-10-01 中北大学 一种新型光纤耦合器
CN114167543A (zh) * 2021-12-10 2022-03-11 长飞（武汉）光系统股份有限公司 一种超快激光加工光纤光栅的自动对准系统

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Publication number Priority date Publication date Assignee Title
WO2001086846A1 (fr) * 2000-05-05 2001-11-15 The Government Of The United States Of America, As Represented By The Secretary Of The Navy Laser a fibres a impulsions ultracourtes dote d'une cavite geree en dispersion
US20050169324A1 (en) * 2004-01-30 2005-08-04 Ilday Fatih O. Self-similar laser oscillator
US20060171426A1 (en) * 2005-02-02 2006-08-03 Andrei Starodoumov Fiber-laser with intracavity polarization maintaining coupler providing plane polarized output
US20060209908A1 (en) * 2003-10-24 2006-09-21 Nkt Research & Innovation A/S An Optical System For Providing Short Laser-Pulses
EP1727248A1 (fr) * 2005-05-23 2006-11-29 PolarOnyx , Inc. Laser pulsé à fibre optique à blocage de mode avec polarisation nonlinéaire à une longueur d'onde d'un micron

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001086846A1 (fr) * 2000-05-05 2001-11-15 The Government Of The United States Of America, As Represented By The Secretary Of The Navy Laser a fibres a impulsions ultracourtes dote d'une cavite geree en dispersion
US20060209908A1 (en) * 2003-10-24 2006-09-21 Nkt Research & Innovation A/S An Optical System For Providing Short Laser-Pulses
US20050169324A1 (en) * 2004-01-30 2005-08-04 Ilday Fatih O. Self-similar laser oscillator
US20060171426A1 (en) * 2005-02-02 2006-08-03 Andrei Starodoumov Fiber-laser with intracavity polarization maintaining coupler providing plane polarized output
EP1727248A1 (fr) * 2005-05-23 2006-11-29 PolarOnyx , Inc. Laser pulsé à fibre optique à blocage de mode avec polarisation nonlinéaire à une longueur d'onde d'un micron

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013099448A1 (fr) * 2011-12-28 2013-07-04 株式会社日立ハイテクノロジーズ Dispositif de correction d'inspection, procédé de correction d'inspection, et laser à fibre optique
JP2013138055A (ja) * 2011-12-28 2013-07-11 Hitachi High-Technologies Corp 検査修正装置、検査修正方法およびファイバレーザ
CN113466994A (zh) * 2021-07-13 2021-10-01 中北大学 一种新型光纤耦合器
CN113466994B (zh) * 2021-07-13 2022-07-05 中北大学 一种新型光纤耦合器
CN114167543A (zh) * 2021-12-10 2022-03-11 长飞（武汉）光系统股份有限公司 一种超快激光加工光纤光栅的自动对准系统

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