WO2020160116A1 - Module paramétrique à plusieurs étages et source laser pulsée picoseconde incorporant le module - Google Patents

Module paramétrique à plusieurs étages et source laser pulsée picoseconde incorporant le module Download PDF

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Publication number
WO2020160116A1
WO2020160116A1 PCT/US2020/015631 US2020015631W WO2020160116A1 WO 2020160116 A1 WO2020160116 A1 WO 2020160116A1 US 2020015631 W US2020015631 W US 2020015631W WO 2020160116 A1 WO2020160116 A1 WO 2020160116A1
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Prior art keywords
output
pump
wavelength
opa
module
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PCT/US2020/015631
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English (en)
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WO2020160116A8 (fr
Inventor
Rancho TZANKOV
Alex Yusim
Igor Samartsev
Pankaj Kadwani
Alexey Avdokhin
Andreas Vaupel
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Ipg Photonics Corporation
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Application filed by Ipg Photonics Corporation filed Critical Ipg Photonics Corporation
Priority to KR1020217027338A priority Critical patent/KR20210118169A/ko
Priority to CN202080011638.9A priority patent/CN113366712A/zh
Priority to EP20749420.4A priority patent/EP3903387A4/fr
Priority to JP2021544625A priority patent/JP2022523735A/ja
Publication of WO2020160116A1 publication Critical patent/WO2020160116A1/fr
Publication of WO2020160116A8 publication Critical patent/WO2020160116A8/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
    • H01S3/005—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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/35—Non-linear optics
    • G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
    • G02F1/3532—Arrangements of plural nonlinear devices for generating multi-colour light beams, e.g. arrangements of SHG, SFG, OPO devices for generating RGB light beams
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/35—Non-linear optics
    • G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
    • G02F1/392—Parametric amplification
    • 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
    • H01S3/0071—Beam steering, e.g. whereby a mirror outside the cavity is present to change the beam direction
    • 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
    • H01S3/0092—Nonlinear frequency conversion, e.g. second harmonic generation [SHG] or sum- or difference-frequency generation outside the laser cavity
    • 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

Definitions

  • the disclosure relates to a picosecond laser.
  • the disclosure relates to a high power quasi-continuous (QCW) picosecond laser based on an optical parametric module which is configured with a plurality of nonlinear crystal-based parametric amplifier (OP A) stages and applications utilizing the OPA module.
  • QCW quasi-continuous
  • OPA nonlinear crystal-based parametric amplifier
  • GaN gallium nitride
  • Another approach popular for developing ultrafast Blue laser sources is based on parametric non-linear optical devices.
  • Green-pumped OP A, optical parametric oscillators (OPOs) and OP generators (OPG) are attractive laser sources due to a wide tuning range and average power scalability.
  • OPOs optical parametric oscillators
  • OPG OP generators
  • synchronously-pumped optical parametric devices are viable ultrafast sources of tunable coherent radiation providing average powers across broad spectral regions.
  • FIG. 1 illustrates an exemplary schematic of the blue laser source based on the staged sum- frequency parametric amplifier as disclosed in USP 7,106,498.
  • This schematic is fairly representative of existing Blue laser sources an includes splitter 1 guiding light fractions at fundamental and pump frequencies respectively along two different optical arms by means of multiple mirrors 9.
  • the output includes four light signals 17, 18, 19 and 20 at respective different frequencies generated in a manner well known to one of ordinary skill in the laser arts.
  • the shown two-arm schematic with splitters, combiners and multiple mirrors has a large footprint and complex configuration which are great disadvantages of the known blue lasers based on the parametric amplification.
  • a lithium triborate LiB305 (LBO) NL crystal has proven exceptionally damage-resistant and absorption-free and, as a consequence, suitable for high-power parametric devices that are otherwise can be easily damaged.
  • Other borate NL crystals b-Barium Borate, BaB204 or BBO and Bismuth Borate, BiB306 or BiBO
  • PPLT, PPLN, and PPKTP periodically poled NL crystals
  • PPLT, PPLN, and PPKTP periodically poled NL crystals
  • the desired minimum pulse peak power when using BBO and BIBO is relatively high due to the employed critical phase-matching conditions.
  • a multi-stage optical parametric (OP) module is configured with upstream, multiple intermediate and output optical parametric amplification (OP A) stages arranged along a single light path and interacting with pump, signal and IR light beams at respective lr, l3 and l f wavelengths.
  • the OPA stages each are provided with a time delay compensation (TDC) assembly alternating with the OPA stages along the single light path.
  • TDCs assemblies each are configured to compensate for the group velocity mismatch between pump and signal beams and guide the IR, pump and signal beams along the light path between the OPA stages while preventing propagation of an idler beam after each subsequent parametric interaction.
  • an optical pump is configured with a linearly polarized (LP) ps fiber laser source which pumps the optical parametric module.
  • LP linearly polarized
  • the disclosed source can be used for simultaneously outputting red, green and blue light.
  • the ps laser source is configured with a mode-locked ps fiber laser using a chirped pulse amplification (CPA) technique to generate an output at a fundamental wavelength in a 1 mm spectral range.
  • CPA chirped pulse amplification
  • the source may simultaneously output Red and Blue light with an average pulse power exceeding 100 W.
  • the fundamental wavelength may be selected from the group consisting of 1030, 1048, 1060 and 1071 nm.
  • FIG. 1 is an optical schematic of the Blue Laser in accordance with the known prior art
  • FIG. 2 is a diagrammatic schematic of the inventive fiber light source
  • FIG. 3A is a diagrammatic view of a Red light generating OPA module incorporated in the inventive fiber laser source of FIG. 2;
  • FIG. 3B is one example of a parametric Blue light generating module in combination with the Red-light generating module of FIG. 3 A;
  • FIG. 3C is another example of the Blue light generating module in combination with the Red light generating module of FIG. 3 A;
  • FIG. 3D is still another example of the OPA module
  • FIG. 3E is a further example of the inventive OPA module
  • FIG. 4A is a detailed optical schematic of the inventive blue laser in accordance with one specific example
  • FIG. 4B is a detailed optical schematic of the inventive blue laser in accordance with another example
  • FIG. 5 illustrates blue-red wavelength relationship of the disclosed RG light source.
  • FIG. 6 is an optical schematic of the disclosed ps fiber laser-based pump module
  • FIG. 7 is a schematic representation of one example of a pulse replicator module in accordance with aspects of the invention.
  • FIG. 8 is a schematic representation of another example of a pulse replicator module in accordance with aspects of the invention.
  • FIG. 2 diagrammatically illustrates the inventive light source 10 including a few modules which are optically coupled to one another.
  • a fiber laser source module 12 is operative to generate a train of ps IR pulses propagating at a fundamental wavelength lf selected from, for example, from 1030, 1048, 1060 or 1071 nm, along a light path.
  • the pump 14 may be packaged in a pump module 16 also including a fiber laser source 12 and outputting the pump and remaining IR light at respective lr and lf wavelengths.
  • a parametric NLO module 18 processes the received output from pump module 16 and is configured to output Red, Green and Blue light at respective signal, pump and Blue wavelengths.
  • a variety of structural examples illustrate the inventive concept. Common to all of the disclosed examples is an optical schematic of NLO module 18 including several OPA stages which are located along a single light path, as better illustrated in the following figures.
  • FIGs. 3A - 3C illustrate the operational principle and structure of NLO 16 of FIG. 2.
  • FIG. 3 A illustrates four OPA stages each including an LBO crystal.
  • the upstream OPA1 is configured to generate a signal beam, i.e., Red light in a 777 - 854 nm wavelength range which, guided along the light path through subsequent intermediate OPA2-OPA3 stages is progressively amplified.
  • the shown schematic includes at least three or more upstream and intermediate LBO OPA stages to provide a sufficient amplification of light components propagating and generating there since the peak power of fiber laser source 12 is limited by a few MWs.
  • the laser source outputs ps IR pulses coupled into a second harmonic generator (SHG) (not shown here) after which the IR light is filtered out while the generated green light at a pump wavelength lp together with a quantum noise are coupled into upstream LBO OPA stage 1.
  • SHG second harmonic generator
  • the latter outputs the green pump light beam, generated Red signal beam and an idler beam at respective signal and idler wavelengths l3, l4.
  • the ultrafast OPA requires time-delay compensation (TDC) of the group velocity mismatch between pump and signal pulsed beams at the output of the LBO crystal. Accordingly, before further parametric amplification of Red signal beam in LBO OPA stage 2, propagating green/pump and red signal beams are incident on a TDC1 positioned in-line with all OPA stages between neighboring LBO OPA stages.
  • OPA module 18 is configured with a plurality of OPA stages and TDCs alternating with one another along the light path.
  • the TDC is an optical system of component that may include chirped mirrors, dichroic mirrors (discarding the idler) and bireftingent windows made of various materials and placed at various temperatures.
  • chirped mirrors dichroic mirrors (discarding the idler)
  • bireftingent windows made of various materials and placed at various temperatures.
  • FIG. 3B illustrating the OPA block which has the configuration of FIG. 3 A, represents one example of an output Blue light-generating OPA stage of the inventive module 18 of FIG. 2.
  • Red signal beam at the signal wavelength l3, amplified in accordance with the schematic of FIG. 3A, is further coupled into the output LBO SHG generating the second harmonic, i.e., Blue light beam.
  • An additional dichroic mirror transmits the Red signal beam, but reflects the generated Blue light beam.
  • FIG. 3C shows another example of the output Blue light generating OPA stage utilizing both polarizations of the output Blue and Red light.
  • the output OPA stage is configured with two SHGs spaced from one another along the light path and flanking a fourth TDC4 which includes a dual half-wave plate.
  • the cross-polarized Blue light and remaining Red light are incident on the following dichroic mirror separating these lights at the output of source 10 of FIG. 2.
  • the schematic of NLO module 18 of FIGs. 3B and 3C provides separate outputs for respective Green, Red and Blue lights which is advantageously utilized in RGB engines as disclosed below.
  • FIGs.3D and 3E illustrate a somewhat different configuration of NLO module 18 utilizing IR light at the fundamental wavelength lra portion of which remains after not shown here the upstream SHG configured to generate Green light beam at the pump wavelength.
  • FIG. 3D illustrates multistage NLO module 18 configured similarly to the configurations of respective FIGs. 3A-3C.
  • the IR light is incident on the OPA block, structured identically to that one of FIGs. 3A, and propagates through all OPA stages unaffected by the parametric operations.
  • the output of the OPA block includes IR light beam, signal Red light beam, and pump Green light beam all of which impinge upon an output upstream dichroic mirror transparent to both Red and IR light but reflecting the Green light towards.
  • the IR and Red light beams are coupled into a SFG stage generating Blue light as a result of mixing the coupled IR and Red light.
  • the output downstream dichroic mirror spaced downstream from the SFG along the light path reflects the Blue light and transmits the remaining portions of IR and Red light beams.
  • the source 10 thus includes three output ports traversed by respective Red, Green and Blue light beams.
  • FIG. 3E like FIG. 3C, advantageously provides the possibility of utilizing orthogonal polarization directions of Red, Blue and IR light beams.
  • This is realized by a combination of spaced apart upstream output and downstream output LBO SFG1 and LBO SFG2 and TDC4.
  • the latter contains a triple half-wave plate along with other mirrors and is located between SFG1 and SFG2.
  • the upstream output SFG mixes the IR and Red light beams resulting in a Blue light beam output. All three lights are incident on the triple half-wave plate shifting the polarization direction of the linearly polarized light.
  • the downstream SFG provides sum frequency generation of Blue light having a polarization direction orthogonal to the polarization of Blue light at the input of this SFG.
  • cross-polarized light is incident on the output dichroic mirror reflecting the Blue light beam and transmitting the Red/IR light beams.
  • FIGs. 3 A -3E it is easy to see that the disclosed schematic is characterized by located in line and alternating OP As and TDCs which define together a single light path through the entire illustrated arrangement.
  • the experimental phase of the above- disclosed structure brought very promising results.
  • ultrafast OP As of FIGs. 3A-3C may be pumped by 50 - 500nJ pulse energy easily achieved by regular fiber lasers.
  • LBO bulk NLOs instead of normally used periodically poled materials, it is probable that the above-disclosed schematic of light source 10 (FIG. 2) can produce more than 1 kW Blue light pulsed output with a spectral linewidth in a 1.5 to 3 nm spectral range in the near future.
  • FIG. 4 A illustrates an exemplary detailed optical schematic of light source 10 generating a source blue output in a 443 - 467 nm wavelength range.
  • the illustrated schematic is structured to provide a single linearly angular light path.
  • a portion of the IR light is transferred to the pump signal in SHG 14 of FIG. 2.
  • the train of ps pulses at fundamental and pump wavelengths is incident on a focal lens L2 which trains each of the pulses to a central region of a first NLO 26 functioning as both OPG/A parametric device constituting an upstream stage of NLO module 18.
  • the first nonlinear crystal 26 interacts with the Green pump beam to produce a Red-light signal beam and an idler beam at respective third signal and fourth wavelengths l3 and l4.
  • the dichroic concaved mirror 28 is transparent to the idler, but reflects the pump and signal light beams in a direction opposite and nonparallel to the one direction such that the reflected light is incident on the same NLO 26 which operates as an OPA.
  • the dichroic mirror 28 is thus a part of the TDC assembly compensating for group velocity mismatch between the reflected pump and Red light beams.
  • the reflected light propagates through the NLO 26 of the upstream OPA stage in the opposite direction repeating thus the process analogous to that in NLO 26 in the other direction.
  • the Red signal beam at the signal wavelength l3 is further amplified.
  • the idler beam at the wavelength l4 is again generated and coaxially propagate along with a further attenuated of Green pump beam and amplified Red light beam.
  • light beams at all wavelengths except for the newly generated idler, which propagates through mirror 30, are reflected towards at least one intermediate OPA stage of module 18.
  • the reflected light beams are further incident on and reflected from a flat mirror 32 guiding the light towards concave mirror 34 which reflects it in the one direction through a second nonlinear crystal of the intermediate OPA stage.
  • the interaction between a second NLO 36 of and the pump signal further amplifies the Red signal at l3 which is then incident on a dichroic curved mirror 38 along with the remaining pump signal, Red signal and idler with the latter being transmitted through this mirror.
  • the reflected light propagates through the second NLO 36 in the opposite direction repeating thus the process analogous to that in the upstream OPA stage.
  • the amplified Red signal, third fraction of pump, idler and IR at respective l3, lr, l4 and lf impinge upon a flat mirror 40 directing all the light except for the idler toward a downstream stage.
  • the downstream stage is configured with a flat mirror 42 and a curved mirror 44 which sequentially guide the received light in the one direction through a SFGs (denoted SHS) including an LBO NLO 46.
  • SFGs denoted SHS
  • LBO NLO 46 LBO NLO 46.
  • the output ps blue light is transmitted through a flat mirror 52 at wavelengths in a 443 - 467 nm wavelength range.
  • the remaining Red and IR light at respective pump l3 and signal lf wavelengths can be further used.
  • This light is reflected from curved mirror 48 in the opposite direction through NLO 46 again generating Blue light incident on a flat mirror 50 and further reflected towards a flat mirror 54 of an output stage.
  • a half-wave plate 56 is in optical communication with mirror 54 and configured to change the polarization of Blue light to be orthogonal to a polarization of the Blue light transmitted through mirror 48.
  • a thin film polarizer (TFP) 58 Downstream from a half-wave plate 56, a thin film polarizer (TFP) 58 combines Blue light output at the desired 443 or 467 nm center wavelength.
  • TFP thin film polarizer
  • the output OPA stage can have a variety of parametric devices alone or in combination with one producing the desired output wavelength. Accordingly, all types of the parametric generation including sum-frequency, difference frequency, types of conversion including sum- frequency, difference frequency and second harmonic generation can be used by appropriately configuring the output stage which can be realized by one of ordinary skill.
  • FIG. 4B illustrates another example of the inventive OPA module 18 of source 10 outputting a 343 nm blue light beam.
  • the source utilized in FIG. 4B includes a ps UV fiber laser source (not sown) which operates at a 343 nm pump wavelength.
  • module 18 Configured generally similarly to the schematic of FIG. 4A, module 18 has the downstream OPA stage provided with an optical parametric amplifier instead of the SFG NLO of the previously disclosed module with the pump beam at 515 nm wavelength.
  • Various types of NLO crystals can be utilized within the context of the disclosure. The crystals may or may not be critically phase-matched for any existing spatial walk-off can be compensated by WOC plates.
  • Such crystal types as BBO, BIBO, KTP, KTA, periodically- poled LiNb03 (PPLN), periodically-poled LiTa03 (PPLT), etc. can be implemented in the schematics of FIG. 2 and 3.
  • LBO and possibly BIBO
  • the NLOs may or may not be non-critically phase-matched crystals. If of any spatial walk-off present, it can be compensated as known to one of ordinary skill.
  • Each NLO crystal is individually thermally controlled to provide the best phase matching condition.
  • NLO module 18 is particularly advantageous when used for RGB engines in visual displays which require generating all three primary colors from
  • RGB engine The efficiency of an RGB engine is based on the following main
  • the primary red, green and blue colors should be selected so as to enable a human eye to detect more than 90% of the color gamut.
  • the speckle phenomenon causing the image distortion should be minimized and desirably eliminated.
  • the RGB light source should be characterized by a high wall-plug efficiency and high luminous efficacy of converted visible light at the minimal output power of the fiber pump as disclosed in this application.
  • the display industry is not the only one benefiting from the disclosed source 10 of FIG. 2.
  • the same parametric module 18 shown, for example in ITGs. 3 A - 3E has been demonstrated to provide an output in a 1.7 - 2.5 mm wavelength range using IR light beam as a pump beam and BIBO crystals instead of LBO crystals.
  • the output OPA stage may be configured with two SHGs, while the remaining OPA stages are configured with parametric amplifiers similarly to those of FIGs. 4A and 4B.
  • the pump module 16 includes ytterbium (Yb)-doped mode locked ps fiber laser 12.
  • Yb ytterbium
  • FIG. 5 illustrates the Blue-Red wavelength relationship based on the equation 1, 2 and 3 with a 515 nm pump wavelength which is generated by SHG 14 interacting with the IR signal from the Yb fiber laser 12 at a 1030 nm fundamental wavelength (FIG. 2).
  • the curve 120 is determined by using a combination of two second harmonic generators (SHGs and SHGi) interacting with light at respective pump wavelengths.
  • curve 120 can be modeled by using a combination of sum-frequency generators (SFGs and SFGi).
  • curve 120 is modeled by utilizing a combination of SFGs and SHG parametric devices.
  • This curve 120 indicates that the desired red and blue wavelengths can be obtained by utilizing two SHG devices or two SFG devices. If the blue light wavelength is changed, for example, to 445 nm wavelength but 610 nm idler wavelength is still required, the combination of SFG stages corresponds to curve 122. The curve 124 corresponding to a combination of SHGs and SFG stages shows that this combination cannot be used for efficient RGB 10 if 610 nm idler wavelength is required. Various combinations of parametric devices can lead to the desired wavelengths. It is the efficiency of light source 10 which ultimately dictates one or another combination of parametric mechanisms so easily obtained utilizing the structural flexibility of NLO module 18 of FIGs. 3 A - 3E and 4A - 4B to adapt to any desired wavelength.
  • Table 1 provides the type of parametric operations and necessary data used by highly efficient RGB source 10 at 1030 nm fundamental wavelength to generate blue and signal (red) outputs at respective 478 nm and 610 nm wavelengths.
  • RGB source 10 is configured with NLO 18 including a SHG of a 1220 nm wavelength to produce the desired source idler output at 610 nm wavelength.
  • NLO 18 including a SHG of a 1220 nm wavelength to produce the desired source idler output at 610 nm wavelength.
  • the SHG mechanism does not work effectively. But using a SFG device interacting with a signal at 892 nm allows the efficient operation of RGB source 10 at 478 nm source signal output.
  • the table also provides the linewidth for source signal, pump and source idler outputs with respective 3 nm, 4 nm and 5 nm linewidths which help avoid the speckles.
  • the conversion efficiency of IR light at the fundamental wavelength to respective red, green and blue signals at a minimal power of laser source of module 12 is between 8 % and 20 %, which is considered to be very high, whereas the output red and blue signal average powers are 158 W, 106 W and 114 W respectively, which is also extraordinary for midsize 2D movie theaters. It is believed that there are no comparable conversion efficiencies and powers for this type of projectors in respective red and particularly blue spectral regions.
  • Table 1 The relationship of different wavelengths of indicated in Table 1 are based on pump module 16 of FIG. 2 generating pump light at a 515 nm wavelength. Other pump wavelengths obviously can be utilized with parametric NLO module 18 based on the energy conservation law in the optical parametric process.
  • Table 2 illustrates signal red and blue wavelengths generated from the OPA/OPO pumped by Green light at a 532 nm wavelength which is a SH of IR light at a 1064 nm wavelength. Table 2 provides the data and parametric mechanisms that render RGB light source at 1064 nm source most efficient for a 2D movie theater.
  • FIG. 6 illustrates fiber laser pump module 12 based on a ps fiber source 100 with a chirped pulse amplification (CPA) architecture in combination with pulse replication.
  • Source 100 may have a variety of configurations including an all fiber or YAG-based structure.
  • the source features a MOPA configuration including thus a master oscillator which outputs a train of ps pulses and fiber or other type amplifier or booster 150.
  • the source 100 further is configured with a pulse stretcher 130, a pulse replicator module 140, an isolator 160 which are all located between the seed and booster, and a pulse compressor 170 following fiber booster 150.
  • Input laser pulses 112 are stretched in time using the pulse stretcher 130, amplified in an amplification stage that includes booster 150 and optionally preamplifier 154, and decompressed using pulse compressor 170. Prior to amplification, the stretched pulses 132 are replicated using the pulse replicator module 140.
  • Pulse stretcher 130 is configured to stretch pulse durations of the input train of pulses 112 to produce a train of stretched pulses 132 having a reduced peak power.
  • the pulse stretcher 130 stretches pulses of the initial pulse train 112 to a pulse duration on the order of a few nanoseconds, and in some instances can be 10 ns.
  • the repetition rate of the stretched laser pulses 132 can be increased by the pulse replicator module 140, which replicates the optical waveform of the stretched laser pulses 132 in time to generate a modified pulse train 148.
  • the temporal plot of the train of stretched laser pulses 132 output by pulse stretcher 130 have a pulse period of t and a pulse repetition rate of 1 It.
  • the pulse replicator 140 can be used to replicate the stretched laser pulses such that t is decreased to a degree where the laser energy of the modified pulse train 148 appears continuous.
  • the nearly continuous-wave characterization of modified pulse train 148 is a function of both the stretching performed by the pulse stretcher 130 and the replication performed by the pulse replication module 140.
  • An example of a system utilizing such laser light is discussed in further detail below.
  • the pulse replicator 140 can be configured to increase the repetition rate of the stretched laser pulses 132 to tens of MHz and multi-GHz levels.
  • the pulse stretcher 130 and/or the pulse replicator module 140 can be configured to generate modified pulses 148 having a desired peak-to-average power ratio. An example is discussed below.
  • the pulse replicator module 140 is an all fiber device comprising at least two fiber optic couplers that include an input fused fiber optic coupler and an output fiber optic coupler and at least one optical fiber delay line disposed between the input and output fused fiber optic couplers. All fiber optic couplers are polarization maintaining. The fiber optic couplers may also be configured as single-mode non polarization-maintaining (PM) fused fiber optic coupler. The pulse stretcher 130 and components of the pulse replicator module 140 can be configured to output pulses at a tailored (high) repetition rate.
  • the pulse compressor 170 compresses the pulse width of the chirped amplified pulses 153.
  • Non-limiting examples of pulse compressors include grating compressors such as CVBGs and Treacy compressors, as well as Martinez compressors and prism compressors.
  • the amplified and compressed laser pulses 174 output from the pulse compressor 170 can be characterized as ultrashort pulsed laser light having a high repetition rate and high average power.
  • a specific application for this output includes the generation of high average power UV laser radiation and is discussed below.
  • FIG. 5 is a schematic representation of a first example of a pulse replicator module 440.
  • the input fused fiber optic coupler 442 is configured as a fiber optic splitter.
  • One of the two fibers exiting the coupling region of output fiber optic coupler 443 forms the output 436 that contains the modified pulse train 148.
  • the optical beam splitter 442 has an input 434 and in this instance input 434 is coupled to the optical pulse stretcher 130 (FIG. 4), and the output 436 of the output coupler 443 is connected to or otherwise coupled to the fiber power amplifier 150.
  • the pulse replicator module 440 also includes and at least one fiber optic coupler 444 disposed between the input coupler 442 and the output coupler 443.
  • a delay t is added using an appropriate length of single-mode fiber (i.e., optical fiber delay line 445) such that one leg or output segment (445) of the pair has an optical path length that is different (longer) than the other leg 446.
  • optical fiber delay line 445 an appropriate length of single-mode fiber
  • a delay of 2t is then put into one of these paths to produce two sets of four pulses when these two outputs are combined in coupler 444. This process can be repeated by doubling the differential delay between the two paths until a desired number of replicas is obtained.
  • the pulse replicator 440 comprises a plurality of stages 449 that each include an optical fiber delay line 445 such that each successive stage introduces a time delay to the stretched laser pulses 132.
  • the pulse replicator 440 includes four stages 449i, 449a, 4493, and 4494, where at each stage the signal power is divided and recombined with a fixed time delay.
  • the pulse replicator 440 is thus configured as a multi-stage passive pulse replicator where each successive stage introduces a fixed time delay to the stretched laser pulses 132. The time delay can increase or decrease by a predetermined amount at each successive stage.
  • the outputs of the last stage 445 4 and 446 4 of replicator 440 are combined in combiner 443 to generate a train of time-delayed replica pulses as the modified pulse train 148 at output 436.
  • each of 8 replica pulses of fiber legs 445 4 and 446 4 are combined in combiner 443 to generate 16 pulses.
  • These 16 pulses are configured as a burst of pulses, and the modified pulse train 148 would thus include a sequence of bursts of pulses that each include 16 pulses.
  • the length of the delay lines 445 1 -445 4 dictate the burst repetition rate (i.e., the time interval between bursts).
  • the pulse stretcher 130 and components of the pulse replicator module 140 can be configured to output pulses at a tailored repetition rate.
  • the repetition rate can be chosen such that peak powers are low enough to avoid undesirable damage and yet sufficiently high enough for efficient frequency conversion.
  • the fiber couplers and fiber delay lines of the pulse replicator module can be used to create various pulse formats, and FIG. 8 is a schematic representation of another example of a pulse replicator module 540.
  • the pulse replicator module can include a sequence of submodules that may each be configured separately.
  • the pulse replicator module 540 shown in FIG. 5 uses as input the output from the pulse replicator module 440 of FIG. 7, but it is to be
  • replicator module 540 can also be used on its own or in combination with submodules having other configurations.
  • pulse replicator module 540 also includes an input fused fiber optic coupler 542 and an output fiber optic coupler 543. In between the input coupler 542 and the output coupler 543 are intermediary fiber couplers (544), (547a), and (547b). Instead of having the delay lines from each stage 549 being directed to the adjacent (downstream) stage, at least one delay line bypasses one or more downstream stages, as shown in the configuration of FIG. 6.
  • delay line 545 4 is directed from intermediary coupler 544 at the output of the first stage 549 1 to output combiner 543, and thereby bypasses second and third stages 549 2 and 549 3 and forms the delay line of fourth stage 549 4 .
  • the time delay increases that are introduced at each successive stage are not all equal to one another.
  • this configuration allows for an initial 16 pulse burst having a total duration (envelope) of 9 ns be converted via four stages 549I-5494 to a 160 pulse burst having an envelope of 90 ns, where each pulse duration is 0.45 ns and the pulses are separated by 0.56 ns. Table 1 below outlines each stage.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
  • Lasers (AREA)

Abstract

L'invention concerne un module paramétrique optique (OP) à plusieurs étages, qui est configuré avec de multiples étages d'amplification paramétrique optique (OPA) intermédiaires et de sortie en amont, disposés le long d'un trajet de lumière unique et interagissant avec des faisceaux de lumière de pompe, de signal et IR à des longueurs d'onde respectives λρ, λ3 and λf. Les étages OPA sont pourvus chacun d'un ensemble de compensation du temps de propagation (TDC) alternant avec les étages OPA le long du trajet de lumière unique. Les ensembles TDC sont configurés chacun pour compenser la dispersion de vitesse de groupe entre les faisceaux de pompe et de signal et guider les faisceaux IR, de pompe et de signal le long du trajet de lumière entre les étages OPA tout en empêchant la propagation d'un faisceau idler après chaque interaction paramétrique subséquente.
PCT/US2020/015631 2019-01-31 2020-01-29 Module paramétrique à plusieurs étages et source laser pulsée picoseconde incorporant le module WO2020160116A1 (fr)

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KR1020217027338A KR20210118169A (ko) 2019-01-31 2020-01-29 다단 광학 파라메트릭 모듈 및 모듈을 통합한 피코초 펄스 레이저 소스
CN202080011638.9A CN113366712A (zh) 2019-01-31 2020-01-29 多级参量模块和包括该模块的皮秒脉冲激光源
EP20749420.4A EP3903387A4 (fr) 2019-01-31 2020-01-29 Module paramétrique à plusieurs étages et source laser pulsée picoseconde incorporant le module
JP2021544625A JP2022523735A (ja) 2019-01-31 2020-01-29 多段光パラメトリックモジュールおよびそのモジュールを組み込むピコ秒パルスレーザ発生源

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US62/799,504 2019-01-31

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CN114006253B (zh) * 2021-10-15 2024-02-09 中国科学院上海光学精密机械研究所 非注入锁定式486.1nm蓝光单频窄线宽全固态激光器
CN116613621B (zh) * 2023-07-16 2023-10-20 武汉中科锐择光电科技有限公司 一种真空压缩态脉冲产生装置

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US20060153254A1 (en) * 2005-01-10 2006-07-13 Kresimir Franjic Laser system for generation of high-power sub-nanosecond pulses with controlable wavelengths in 2-15 mum region
WO2015165882A1 (fr) * 2014-05-01 2015-11-05 Danmarks Tekniske Universitet Compresseur d'impulsions à haute énergie utilisant un élargissement spectral à auto-défocalisation dans des milieux anormalement dispersifs
US20180337508A1 (en) * 2017-05-17 2018-11-22 The Penn State Research Foundation Divided pulse nonlinear optical sources
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CN117526072B (zh) * 2023-11-10 2024-04-02 天津大学 双色泵浦高功率飞秒光学参量放大器装置

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JP2022523735A (ja) 2022-04-26
EP3903387A1 (fr) 2021-11-03
CN113366712A (zh) 2021-09-07
WO2020160116A8 (fr) 2021-08-12
EP3903387A4 (fr) 2022-10-12
KR20210118169A (ko) 2021-09-29

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