EP3607621A1 - Laserverstärkersystem mit zweistufigem kompressorsystem - Google Patents
Laserverstärkersystem mit zweistufigem kompressorsystemInfo
- Publication number
- EP3607621A1 EP3607621A1 EP18715599.9A EP18715599A EP3607621A1 EP 3607621 A1 EP3607621 A1 EP 3607621A1 EP 18715599 A EP18715599 A EP 18715599A EP 3607621 A1 EP3607621 A1 EP 3607621A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- laser
- fiber
- amplifier
- laser pulses
- solid
- 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.)
- Pending
Links
Classifications
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- 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
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0057—Temporal shaping, e.g. pulse compression, frequency chirping
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- 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
- H01S3/02—Constructional details
- H01S3/025—Constructional details of solid state lasers, e.g. housings or mountings
-
- 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
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- 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
- H01S3/2308—Amplifier arrangements, e.g. MOPA
- H01S3/2316—Cascaded amplifiers
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- 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
- H01S3/06758—Tandem 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
- H01S3/2375—Hybrid lasers
Definitions
- the present invention relates to ultrashort pulse (UKP) laser systems, in particular to UKP laser systems for amplifying pulsed laser radiation to high power and / or high pulse energy. Furthermore, the invention relates to a method for dispersion compensation in such laser systems.
- UKP ultrashort pulse
- fiber laser amplifiers can be used as the input stage and solid-state based amplifiers as post-amplifiers, see eg "Industrial grade fiber-coupled laser systems delivering ultrashort high power pulses for micromachining" in Proc. Of SPIE Vol. 9741 975109- 1.
- Initial laser pulses coupled into the fiber laser amplifiers are amplified in the fiber and at the same time stretched.
- the initial laser pulses can be, for example, seed pulses of a seed laser.
- These preamplified laser pulses are amplified to the desired high output pulse energy in the solid-state based post-amplifier time-compressed the post-amplified laser pulses and output as output laser pulses (also referred to herein as output pulses).
- the compression of the post-amplified laser pulses is usually carried out with a downstream compressor system, which supplies the gain associated with the amplification
- Dispersion largely compensated so as to set the desired ultrashort pulse duration for the output laser pulses.
- the dispersion to be compensated may comprise, in addition to the dispersion supplied in the amplification media, also the dispersion which is supplied to the seed pulses in a gain system which precedes the amplification and which brings about an additional laser pulse extension.
- a stretching system temporally stretched seed pulses are thus coupled into the fiber as initial laser pulses.
- the pulse stretching reduces the pulse peak power u.a. in the amplification media and is the basis of the so-called "chirped pulse amplification" (CPA).
- Strecker and compressor systems can generally be used in transmission or reflection dispersive optical elements such as (diffraction) gratings, volume Bragg gratings, prisms and / or grisms and / or dispersive mirrors such as Gires-Tournois interferometer mirrors (GTI mirrors ) and, for example, as lattice stretchers and lattice compressor assemblies be educated.
- optical elements such as (diffraction) gratings, volume Bragg gratings, prisms and / or grisms and / or dispersive mirrors such as Gires-Tournois interferometer mirrors (GTI mirrors ) and, for example, as lattice stretchers and lattice compressor assemblies be educated.
- GTI mirrors Gires-Tournois interferometer mirrors
- Lattice compressors allow the compensation of large dispersion values, such as those that can occur when amplifying to high power and / or high pulse energy, but are sensitive to changes in the beam position after the solid state amplifier and compressor maladjustment due to high thermal loads, since any path change in the lattice compressor leads to a change in the dispersion and thus the pulse duration change.
- high power high energy UKP laser systems also require large beam diameters in the lattice compressor, so that correspondingly large and expensive optical gratings are used.
- US 2013/0223460 A1 further discloses a pulsed laser amplifier system in which the compression of amplified laser pulses takes place in a compressor, which adjoins the amplification process and is usually operated in vacuum.
- an adjustment compressor is additionally provided for setting the dispersion.
- the adjustment compressor effectively fine adjusts the pulse duration of the pulses output, particularly while maintaining the initially stretched pulses for the amplification.
- the adjustment compressor advantageously provides less than 20% and preferably less than 10% of the compression rate of the compressor.
- An aspect of this disclosure is based on the object of proposing a compression concept which allows the use of smaller gratings and is more tolerant to changes in the beam path of the amplified laser beam. At least one of these objects is achieved by a laser amplifier system according to claim 1 and by a method for amplifying laser pulses according to claim 15. Further developments are given in the subclaims.
- a laser amplifier system comprises a two-stage compressor system for outputting output laser pulses by amplifying initial laser pulses.
- the laser amplifier system in this case comprises a fiber laser preamplifier unit for preamplifying coupled-in initial laser pulses and for outputting preamplified laser pulses, an intermediate compressor stage for temporally partial compression of the preamplified laser pulses, a solid state amplifier unit for post-amplifying time-compressed pre-amplified laser pulses and outputting post-amplified laser pulses, and a post-compressor stage for temporally compressing the post-amplified laser pulses to produce the output laser pulses.
- a method of amplifying laser pulses comprises the steps of providing a seed laser pulse source unit for generating seed laser pulses to be seeded for initial laser pulses, preamplifying the seed laser pulses with a fiber preamplifier unit to produce preamplified laser pulses, and partially compressing the preamplified laser pulses Post-amplifying partially compressed preamplified laser pulses with a solid state amplifier unit and compressing the post-amplified laser pulses.
- the embodiments disclosed herein may include i.a. have the following advantages:
- a partial compression means that no maximum spectrally possible compression is performed after the fiber laser preamplifier unit, but that the pulse length is only partially reduced.
- a two-stage compression reduces the pulse length, for example by at least 30%, preferably by 50%) or more. For example, at least 75% of the pulse length can be removed.
- the peak pulse power should not become too high due to the optical element damage thresholds and possible non-linearities which, inter alia, determine the minimum minimum input pulse length as the lower limit to the degree of partial compression.
- reflection gratings for the second compressor disposed after the solid state amplifier since these provide higher efficiency than transmission gratings.
- large grids have corresponding unevenness, which can adversely affect the beam quality.
- the larger the grille the greater unevenness must be taken into account.
- Precompression now allows smaller grids to be used, reducing the impact on beam quality through the grids of the post-compressor stage. In pre-compression itself, small beam diameters and thus small grids or transmission grids can be used, whereby the beam quality is also little affected here.
- the sensitivity of a compressor to the beam position of the amplified laser pulses increases with the compression factor, eg the size of the lattice compressor. Since a fiber laser system is fundamentally more stable with respect to the beam position than a solid state amplifier (especially at high powers and thus high thermal load in the solid state amplifier), it is generally advantageous to reduce the compression factor after the solid state amplifier and the pulses as possible before the solid state amplifier to compress that too high intensities are not generated in the solid state amplifier. For a setting (in particular optimization) of the pulse duration or the pulse shape of the output laser pulses, it is necessary to adapt the dispersion properties of the compressor and possibly of the straightener.
- Fiber lasers often use chirped fiber Bragg grating for stretching, which typically offers less freedom to adjust the dispersion as the compressor. Therefore, the dispersion is often adjusted by manipulating the compressor system.
- high performance UKP systems with only one compressor after the solid state amplifier, such a necessary adjustment of the (only existing) compressor system is demanding due to the high performance in the compressor.
- the two-stage compressor system proposed herein it may be possible to carry out the dispersion adjustments already in the first compressor at significantly lower powers, or at least partially to contribute thereto.
- a two-stage compressor design with the same size (same dispersion parameters) of the output compressor can provide higher temporal insertion factors for the fiber laser preamplifier unit and / or the solid state amplifier unit, so that in particular higher pulse energies can be extracted from the fiber stage and from the laser amplifier system as a whole .
- the concepts of reducing compression factors of compressor stages disclosed herein can be used in amplifier systems that are not substantially based on spectral broadening during post-amplification.
- the concepts disclosed herein are applicable in amplifier systems employing different amplifier media (e.g., fiber amplifiers for the fiber laser preamplifier unit and rod or disk amplifiers for the solid state repeater unit).
- different amplifier media e.g., fiber amplifiers for the fiber laser preamplifier unit and rod or disk amplifiers for the solid state repeater unit.
- FIG. 1 shows an exemplary schematic representation of a laser amplifier system with a two-stage compressor structure
- FIG. 2 shows a schematic representation of a first exemplary embodiment of a low-repetition laser system with a plurality of rod post-amplifiers operating in the kHz range
- FIG. 3 shows a schematic representation of a first exemplary embodiment of a low-repetition laser system with a multipass disc repeater for generating high pulse energies in the MHz range.
- Aspects described herein are based in part upon the discovery that by a two-stage compressor system having a first compressor between, for example, a fiber laser and a solid state amplifier (referred to herein as an intermediate compressor stage) and a second compressor after the solid state amplifier (referred to herein as the postcompressor stage) the compression factor of the second compressor can be reduced.
- a two-stage compressor system having a first compressor between, for example, a fiber laser and a solid state amplifier (referred to herein as an intermediate compressor stage) and a second compressor after the solid state amplifier (referred to herein as the postcompressor stage) the compression factor of the second compressor can be
- a reduced beam diameter in the spectrally dispersive (split) direction is present in a lattice compressor designed as an after-compressor stage due to the smaller compression factor, so that smaller (and more cost-effective) optical lattices are used in this direction for the compression of the output pulses with high powers and / or pulse energies can be.
- the required stretching factors at different amplifier stages may allow, with a partial compression, ie, a compression between the different amplifier stages, to still fulfill a subsequently lower required stretching factor, thereby reducing the compression that becomes necessary in the end becomes.
- This can simplify the construction of the second (post) compressor stage.
- An exemplary attractive approach for a high power, high energy UKP laser system is the combination of a fiber laser input stage with a solid state amplifier.
- the fiber laser is flexible and e.g. very stable with respect to its output beam position.
- the solid state amplifier allows higher average powers and pulse energies (peak powers).
- the pulses Prior to boosting the pulses in the fiber laser system, the pulses are typically stretched in time to reduce peak power and, therefore, must subsequently be time compressed again.
- a complete (pre-) compression of the pulses directly after the fiber laser input stage is usually not possible because then occurring in the solid state amplifier Intensities would be too high and, for example, non-linear effects or damage to the amplifier medium (solid state, eg in the form of a rod, slab or a write) or optical components such as a Pockels cell can occur. Therefore, amplification of stretched pulses in the solid state amplifier and thus compression after the solid state amplifier is necessary.
- solid-state amplifiers In comparison to fiber-based amplifiers, solid-state amplifiers typically operate with significantly larger mode surfaces and thus with the same pulse duration at lower intensities and nonlinearities. For this reason, less stretching is required for a solid state amplifier than for a fiber laser. This allows the compression of the pulses, for example, in two stages, i. with a first compressor immediately after the fiber laser and a second compressor after the solid state laser to perform. The advantages of such a two-stage compressor approach have been explained in the introduction. In the following, the amplification process and the associated components of a (UKP) laser amplifier system 1 are explained by way of example in connection with FIG.
- the laser amplifier system 1 comprises a seed laser pulse source unit 3, optionally a gain system 5 upstream of the amplification process, a fiber laser preamplifier unit 7, an intermediate compressor stage 9, a solid-state amplifier unit 11 and a post-compressor stage 13.
- the fiber laser preamplifier unit 7 and the solid-state amplifier unit 11 are designed such that In the case of the respective amplification processes in the operating range of the laser amplifier system 1, the fiber laser preamplifier unit 7 requires a greater stretching factor than the solid-state amplifier unit 11.
- the laser pulses which leave the respective component are indicated schematically as intensity curves over time.
- the amplification process z. B. designed such that the spectrum of a laser pulse when passing through the solid state amplifier unit 11 (or possibly when passing through the entire Laserverstär- kersystems 1) substantially spectrally broadened, possibly due to "gain narrowing" spectrally narrower.
- the seed laser pulse source unit 3 provides a train of seed laser pulses 3A for subsequent amplification.
- the seed laser pulses 3A have a seed pulse length in the range from ns to fs, for example, and are generated at a repetition rate in the kHz range up to the MHz range.
- the seed laser pulse source unit 3 is exemplified in FIG. 1 as a fiber oscillator 3B.
- the fiber oscillator 3B comprises, for example, an Ytterbium-doped, fiber-based and mode-locked fs oscillator for generating laser pulses with pulse lengths of, for example, a few 100 fs at wavelengths around 1030 nm, pulse energies in the range from, for example, 20 pJ to 100 pJ and repetition rates in the range of eg less than 50 MHz, such as 20 MHz or 10 MHz or a few 100 kHz.
- thulium-doped and erbium-doped fibers in the ⁇ wavelength range and holmium-doped fibers in the 2 ⁇ wavelength range.
- solid-state oscillators for example, bar, slab or disk lasers
- diode lasers or microchip lasers can be used to generate the seed laser pulses 3A.
- part of the generation of the seed laser pulses 3A may be a spectral broadening in a fiber upstream of the fiber laser preamplifier unit.
- the optional straightener system 5 (also referred to as pulse length straightener) makes it possible to set the pulse length of the laser pulses coupled into the fiber laser preamplifier unit 7, ie, the initial laser pulses 5A, such that a minimum fiber output pulse length T m i n , fiber out at (explained below) Output of the fiber laser amplifier unit 7 is not exceeded.
- the extensor system 5 may be formed, for example, as a chirped fiber Bragg grating stretcher 5B. Furthermore, (diffraction) grating straighteners can be used.
- the optional traction system 5 may be implemented separately or as part of the seed laser pulse source unit 3.
- Pulse length stretching over a dispersive fiber or dispersive optical structure may reduce the pulse length of the seed laser pulses to e.g. 100 ps to 1 ns (or up to several ns) before they are provided to the fiber preamplification system 5 as initial laser pulses 5 A.
- a first preamplification operation may occur even before the pulse length stretching.
- the amplification process begins with the coupling of the initial laser pulses 5A into the fiber laser preamplifier unit 7.
- Two reinforcing fibers 7B are shown by way of example in Figure 1.
- the amplification process in an amplification fiber 7B is characterized in particular by a mode size in the amplification fiber 7B, a maximum laser pulse energy / pulse peak power present in the amplification fiber 7B and / or a material property of the amplification fiber 7B, such as an optical nonlinearity, and the minimum fiber output pulse length l min, fiber out for the pre-amplified laser pulses 7A.
- the solid-state amplifier unit 11 has a minimum solid-state input pulse length T mm , FK in, which is required for a stable operation of the laser amplifier system 1, which is particularly uninfluenced by nonlinearities. This is shorter than the minimum fiber output pulse length Tmin, fiber out.
- the fiber laser preamplifier unit 7 may comprise, for example, a sequence of fiber optic amplifier stages optically coupled in series, wherein the input laser pulses 5A are sequentially amplified in the fiber laser amplifier stages and output as an intermediate pulse train comprising the intermediate pulse length comprising the preamplified laser pulses 7A.
- the intermediate pulse length is greater than the minimum fiber output pulse length l min, fiber out, but also larger than would be necessary in view of the required minimum solid-state input pulse length T m in, FK in.
- the pulse lengths of the preamplified laser pulses 7A are above (or comparable to) the minimum fiber output pulse length T m in, fiber out, which is presupposed for a stable, in particular with respect to nonlinearities controllable operation of the fiber laser preamplifier unit 7.
- Exemplary values of minimum output pulse length l min, fiber out are 10 ps to several 100 ps.
- An example of a gain fiber 7B is a "single clad" single-mode step-index fiber that is pumped, for example, with a “single-mode” pumping unit.
- pulse energies of up to 1 ⁇ can be achieved starting from the seed pulses, for example low repetition at a power of 500 mW and a repetition rate of 500 kHz See also the description in connection with Figures 2 and 3.
- a pulse selection unit can be provided in order to more efficiently amplify individual selected laser pulses in the fiber laser preamplifier unit 7 and / or solid state amplifier unit 11.
- fiber-coupled acousto-optic modulators or free jet acousto-optic modulators - AOM
- EOM electro-optical modulators
- preamplified laser pulses 7A are output, which are then fed to the intermediate compressor stage 9 for time compression to shorten the laser pulses to values above (equal to) the minimum minimum input pulse length ⁇ min, FK in ZU. That is, in the intermediate compressor stage 9, a first temporal recompression of the laser pulses takes place at pulse lengths of, e.g. a few 10 ps or a few 100 ps.
- the first temporal recompression may e.g. with a grating compressor 9B, shown schematically in FIG. 1, with a transmission grating.
- a (chirped) volume Bragg grating or GTI mirror can also be used alternatively or additionally, which allows a jet-stable intermediate compressor stage 9 by its compact construction, since only the coupling is to be made stable.
- the first temporal partial compression is designed to compensate for as much dispersion as possible before post-amplification, but the post-amplification should not be adversely affected, but at the same time the remaining dispersion to be compensated should be reduced as much as possible.
- the intermediate compressor stage 9 is designed such that the pulse length of the pre-amplified laser pulses 7A, which is greater than or equal to the minimum fiber output pulse length T m i n , fiber out, is compressed to a pulse length which is smaller than the minimum fiber output pulse length l min, Fiber is out and greater than or in the range of minimum solids input pulse length T m m, FK is in.
- dispersive elements can thus be considered in the further beam path.
- the intermediate compressor stage 9 outputs temporally partially compressed pre-amplified laser pulses 9A.
- the partially time-compressed pre-amplified laser pulses 9A are supplied to the solid-state amplifier unit 11 for post-amplification. Accordingly, the solid-state amplifier unit 11 outputs amplified laser pulses I IA.
- the solid-state amplifier unit 11 may comprise at least one solid-state laser amplifier stage, which is designed as a rod, slab or disk laser amplifier stage. Furthermore, optionally, the at least one solid-state laser amplifier stage can be designed as a linear amplifier or regenerative amplifier.
- the solid-state amplifier unit 11 may in particular comprise a sequence of solid-state laser amplifier stages optically coupled in series, wherein laser pulses in the solid-state laser amplifier stages are sequentially amplified and output as post-amplified laser pulses I IA.
- the solid-state amplifier unit 11 can be operated, for example, as a low repetitive amplifier stage in the repetition range of eg 20 kHz to 1 MHz (or up to a few MHz, for example 10 MHz).
- the solid-state amplifier unit 11 may comprise optical components such as a solid-state laser medium I IB and in particular beam guiding optics such as deflection mirrors 1 IC and optionally an optical switching element (pulse selection unit) such as a Pockels cell HD interacting with a polarizer (indicated schematically in FIG. 1).
- at least one of the optical components is associated with a maximum pulse power that the solid-state minimum input pulse length T m i n, FK in extent.
- the maximum pulse power is given, for example, by a maximum tolerable nonlinearity associated with the present optical parameters.
- the maximum pulse power depends, for example, on the mode size, the frequency dependence of the gain in one of the optical elements, in particular in a solid-state laser medium, such as a rod, slab, or disk laser solid-state laser medium, and / or the influence of the beam quality by the nonlinearity, for example the formation a spatial chirp by self-phase modulation, from.
- the frequency dependence of the gain here refers to an undesired influence on the spectrum of the pulses, which leads to a reduced pulse quality can.
- the maximum pulse power can be given by a (in particular surface) damage threshold associated with a mode variable in one of the optical elements, in particular the optical switching element such as the Pockels cell HD, or the onset of a degradation of the optical parameters.
- the post-amplified laser pulses 11 A in the post-compressor stage 13 are time-recompressed to the desired (usually the minimum possible) pulse length. For example, pulse lengths of a few 100 fs to a few 100 ps can be achieved.
- Recompression may e.g. again with a, as in the figure 1 schematically indicated grating compressor 13B done. The recompression can in turn take into account subsequent optical dispersive elements in the further beam path. For example, a chirped volume Bragg Grating or GTI mirror may also be used for recompression.
- the time-recompressed post-amplified laser pulses may be used as output laser pulses 13A of the post-compressor stage 13 for workpiece processing in a machine tool, e.g. for micromachining, with the desired pulse length and corresponding peak pulse powers.
- Figures 2 and 3 illustrate that the concept of two-stage compression can be implemented in differently oriented laser systems depending on the type of amplifier stages. So you can get pulses with very different pulse duration and pulse intensity.
- FIG. 2 relates to a low-repetition laser system with a plurality of bar amplifiers and FIG. 3 to a low-repetition laser system with a multi-pass slice amplifier.
- the fiber laser preamplifier unit 7 ' may comprise one or more (for example two) 10 ⁇ MFD fibers, which, for example at a repetition rate of 10 kHz pulses with one Pulse duration of 500 ps and a pulse energy of 1 ⁇ ] (ie, output power of 0.01 W) spend.
- the pulses are compressed to a pulse length of 10 ps (with substantially equal pulse energy and output power of 0.01 W) and then amplified into a plurality of post-repeaters 11' to a pulse energy of, for example, 1 mJ (at substantially the same Pulse length of 10 ps), so that the output power is 10 W.
- the 1 mJ pulses are compressed to a pulse duration of, for example, 1 ps (with essentially the same output power of 10 W).
- the fiber laser preamplifier unit 7 shown schematically in FIG.
- 3 may comprise, for example, one (or more) 50 ⁇ m MFD-Rod fibers which, for example, have pulses at a repetition rate of 1 MHz Pulse duration of 1 ns and a pulse energy of 100 ⁇ (ie, an output power of 100 W.
- the pulses are compressed to a pulse length of 100 ps (with substantially equal pulse energy and output power of 100 W).
- the partially compressed pulses pass through a disk repeater 11 "several times and are amplified to a pulse energy of, for example, 3 mJ (with substantially the same pulse length of 100 ps), so that the output power of the disk replenisher 11" is 3 kW.
- the 3 mJ pulses are compressed to a pulse duration of, for example, 1 ps (with essentially the same output power of 3 kW).
- high pulse peak powers or very high pulse energies can be generated at a very short pulse duration.
- the pulse lengths, the optical media used, for example, the amplification fibers and solid-state laser media and their gain factors can be selected accordingly the.
- B-integrals in the range of 30 rads and smaller (eg, 5 rads and smaller or, for example, 3 rads and smaller) associated with the initial laser pulses 5A / pre-amplified laser pulses 7A may be used.
- the B integrals associated with the post-amplified laser pulses 11A may also be used in the range of 30 radians and smaller (eg 10 radians and less than or 5 radians and less than or equal to 3 radians and smaller).
- B integrals of the post-amplified pulses can be present, for example, in the range of 10 radians and smaller, at least for the fundamental mode.
- the concept of two-stage compression disclosed herein further also includes multi-stage compression when, for example, there is a split first compression between reinforcing fibers and / or the second compression is effected with a plurality of compressors.
- the concept disclosed herein also includes, among other things, an amplification system based on a diode laser as a seeded laser pulse source unit with a subsequent spectral broadening in a fiber, a fiber laser preamplifier unit of an intermediate compressor stage, a solid state amplifier unit and an aftercompressor stage.
Abstract
Description
Claims
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DE102017107358.2A DE102017107358A1 (de) | 2017-04-05 | 2017-04-05 | Laserverstärkersystem |
PCT/EP2018/057928 WO2018184943A1 (de) | 2017-04-05 | 2018-03-28 | Laserverstärkersystem mit zweistufigem kompressorsystem |
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US (1) | US20200036152A1 (de) |
EP (1) | EP3607621A1 (de) |
CN (1) | CN110506372B (de) |
DE (1) | DE102017107358A1 (de) |
WO (1) | WO2018184943A1 (de) |
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DE102018221363A1 (de) * | 2018-12-10 | 2020-06-10 | Trumpf Laser Gmbh | Lasersystem und Verfahren zum Betreiben eines solchen Lasersystems |
CN111509547A (zh) * | 2020-03-27 | 2020-08-07 | 中国科学院上海光学精密机械研究所 | 超高峰值功率飞秒激光级联混合压缩系统 |
WO2022019906A1 (en) * | 2020-07-22 | 2022-01-27 | Lsp Technologies, Inc. | Method and system for use in laser shock peening and laser bond inspection process |
CN114178710A (zh) * | 2020-08-24 | 2022-03-15 | 奥特斯(中国)有限公司 | 部件承载件及其制造方法 |
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FR2965673B1 (fr) * | 2010-09-30 | 2013-08-23 | Ecole Polytech | Dispositif d'amplification a derive de frequence pour un laser impulsionnel |
US9166355B2 (en) * | 2011-09-12 | 2015-10-20 | Lawrence Livermore National Security, Llc | Directly driven source of multi-gigahertz, sub-picosecond optical pulses |
CN105305221A (zh) * | 2015-11-25 | 2016-02-03 | 吕志伟 | 一种百皮秒至纳秒脉冲宽度可调的固体激光器 |
CN105428975B (zh) * | 2015-12-23 | 2019-02-01 | 上海朗研光电科技有限公司 | 高功率飞秒光纤激光器 |
CN205248608U (zh) * | 2015-12-23 | 2016-05-18 | 上海朗研光电科技有限公司 | 高功率飞秒光纤激光器 |
CN106451042A (zh) * | 2016-10-14 | 2017-02-22 | 南方科技大学 | 用于光纤激光器的啁啾脉冲放大系统 |
-
2017
- 2017-04-05 DE DE102017107358.2A patent/DE102017107358A1/de not_active Withdrawn
-
2018
- 2018-03-28 CN CN201880023708.5A patent/CN110506372B/zh active Active
- 2018-03-28 EP EP18715599.9A patent/EP3607621A1/de active Pending
- 2018-03-28 WO PCT/EP2018/057928 patent/WO2018184943A1/de unknown
-
2019
- 2019-10-02 US US16/590,774 patent/US20200036152A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
WO2018184943A1 (de) | 2018-10-11 |
DE102017107358A1 (de) | 2018-10-11 |
US20200036152A1 (en) | 2020-01-30 |
CN110506372A (zh) | 2019-11-26 |
CN110506372B (zh) | 2021-09-03 |
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