CN109462137A - One kind picosecond terawatt (TW) CO2Laser amplifier pump arrangement - Google Patents

One kind picosecond terawatt (TW) CO2Laser amplifier pump arrangement Download PDF

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Publication number
CN109462137A
CN109462137A CN201811522907.9A CN201811522907A CN109462137A CN 109462137 A CN109462137 A CN 109462137A CN 201811522907 A CN201811522907 A CN 201811522907A CN 109462137 A CN109462137 A CN 109462137A
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Prior art keywords
laser
pump
module
pumping
electric
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CN201811522907.9A
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Chinese (zh)
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CN109462137B (en
Inventor
肖瑜
夏燃
唐霞辉
李想
秦应雄
胡聪
宋宇燕
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Huazhong University of Science and Technology
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Huazhong University of Science and Technology
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Priority to CN201811522907.9A priority Critical patent/CN109462137B/en
Priority to PCT/CN2019/072301 priority patent/WO2020118864A1/en
Publication of CN109462137A publication Critical patent/CN109462137A/en
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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
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
    • 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
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
    • H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/22—Gases
    • H01S3/223—Gases the active gas being polyatomic, i.e. containing two or more atoms
    • H01S3/2232—Carbon dioxide (CO2) or monoxide [CO]

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Lasers (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)

Abstract

This application discloses one kind picosecond terawatt (TW) CO2Laser amplifier pump arrangement, including pump laser module, electric pump module and laser resonator；The axis three of the axis of pump laser module, the direction of an electric field of electric pump module and laser resonator is orthogonal；Pump laser module is for pumping CO2Molecule 0003 sequence bands；Electric pump module is for pumping CO2Molecule 0001 conventional belt；Laser resonator is for realizing laser output.Proposed by the present invention picosecond of terawatt (TW) CO2 laser amplifier pump arrangement, by carrying out optical pumping while discharge excitation, using the characteristic encrypted gain spectral of sequence band gain spectrum and conventional belt gain spectrum juxtaposition, so that hybrid gain broadening of spectral lines, realizes continuous spectrum picosecond CO2Pulse amplifying.And slow down pulse warp after frequency spectrum separating phenomenon, avoid laser energy can be assigned to input pulse modulated after be split into a series of discrete ps pulses up cause the energy of single ps pulse too low, improve the amplification efficiency of ultrashort pulse.

Description

One kind picosecond terawatt (TW) CO2Laser amplifier pump arrangement
Technical field
The present invention relates to optical technical fields, more particularly to one kind picosecond terawatt (TW) CO2Laser amplifier pump arrangement.
Background technique
In recent years, since laser plasma accelerates (LPA) to lead using the demand of the infrared ultrashort and ultrahigh laser driver of centering Draw, CO2The research of ultrashort pulse amplifier has very big breakthrough.During laser pulse and Plasma Interaction, by I λ is proportional in the energy that intense laser pulse passes to charged particle2(I is light intensity, and λ is wavelength), long-wavelength infrared laser with it is short The Solid State Laser of wavelength, which is compared, very big advantage.Obtain wavelength high-gain of middle infrared band, height near 10 μm The laser of energy exports, CO2Laser is only current option.Due to the demands such as laser plasma acceleration, ultrashort superpower CO2 Laser system very likely becomes main force's light source that next-generation LPA generates high energy proton (ion), electron beam, picosecond terawatt (TW) CO2 Laser amplifier is accelerated development.
The multistage amplification of ultrashort laser pulse needs a continuously smooth gain spectral, bandwidth need than Fourier transformation by The frequency spectrum of the input pulse of limit is wider.However, CO2Molecule gain spectrum is discontinuous, CO2The gain spectral of molecule is by a system The spectral line composition of discrete narrowband is arranged, every spectral line corresponds to a molecule rotational energy level transition.Only when electric discharge air pressure is up to When 25atm, due to the effect of collision broadening, CO2The gain spectral of the conventional belt 10P branch (10.6 μm of bands) of molecule is just close continuous, The bandwidth of gain is about 1.2THz.Prime regenerative amplification input pulse is generally ps-nJ or ps- μ J magnitude, this strength pulse The electric field of light beam causes the field of spectral line to cause to widen (AC Stark effect) insufficient for one company of realization in entire gain band Continuous spectral line.Due to CO2Molecule gain spectral property, the pulse for inputting regenerative amplifier can be split into a series of discrete pulses, Under the influence of first stage amplifier.It is limited to CO2The characteristic of the gain spectrum narrow bandwidth of molecule, discretization, in high gain-bandwidth medium In widely applied chirp amplifying technique (CPA) be difficult in CO2It is realized in laser.The modulation for solving discrete periodic spectral line is asked Topic, mainly passes through two approach: increasing spectral density and hyperbar using isotope makes the spectral line broadening of single rotational energy level.So And high-purity isotope is very expensive, the accurate concentration for controlling isotopic molecule is also extremely difficult.TEA(Transversly Excited Atmospheric, transverse excitation atmosphere) the real work voltage of discharge system is far smaller than 25atm, at this time CO2The gain spectral of molecule shows discrete stalling characteristic.One ultrashort pulse is discrete or discrete put by gain spectral After big device, only have component frequency component to be amplified in ultrashort pulse, and some frequency component cannot effectively amplify, when The modulation for the intrinsic frequency that the single pulsation for showing as input in domain is determined by spectral line interval and when being split into a series of fixed Between the pulse that is spaced.When air pressure of discharging is increased to 25atm, gain spectral is approximate continuous, but, in so high air pressure conditions Under be difficult to obtain stable large volume glow discharge.The pole that 15atm steady glow discharges already close to current discharge technology condition Limit, and region of discharge volume very little.Therefore, it is desirable to realize continuous spectrum CO by improving electric discharge air pressure2Amplify also extremely difficult.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, this application provides one kind picosecond terawatt (TW) CO2Laser amplifier Device pump arrangement, it is intended to solve CO2The problem of molecule gain spectral discretization and narrow linewidth.
To achieve the above object, the present invention provides one kind picosecond terawatt (TW) CO2Laser amplifier pump arrangement, including laser Pump module, electric pump module and laser resonator；The direction of an electric field and laser of the axis of pump laser module, electric pump module The axis three of resonant cavity is orthogonal and intersects at the center of laser resonator；Pump laser module is for pumping CO2Molecule 0003 sequence bands；Electric pump module is for pumping CO2Molecule 0001 conventional belt；Laser resonator passes through pump laser module and electricity The method that pump module pumps simultaneously, makes hybrid gain broadening of spectral lines using spectral line juxtaposition, for realizing laser output.
Pump laser module includes the diode pumped solid state laser being sequentially coaxially arranged and collimator, and collimator is used for The pump light collimation that the diode pumped solid state laser is generated.Wherein, in CO2Under laser operating status, semiconductor Light-pumped solid state laser exports pumping laser, collimates pump light by collimator, enters laser by pump light input window Resonant cavity forms pumping laser orientation of oscillation, makes CO in laser resonator roundtrip2Molecular transition is to 0003 energy levels improve Pumping efficiency.Meanwhile by cathode and anode in laser c O2The electric discharge of laser discharge area, makes CO2Molecular transition is to 0001 energy level.This Invention can encrypt gain spectral, promote CO using sequence band gain spectrum and conventional belt gain juxtaposition characteristic2Molecular sequences Band gain.
Preferably, the solid state gain medium of diode pumped solid state laser is Cr4+: YAG.
Preferably, the pumping source of diode pumped solid state laser is semiconductor laser, efficient Yb optical-fiber laser or Nd: YAG laser.
Electric pump module includes cathode and anode, and add high pressure electric discharge between a cathode and an anode.
Laser resonator includes pumping cylinder laser pump cavity, 3 pumping laser reflecting mirrors, CO2Laser back mirror and CO2Swash Light output mirror；Pumping cylinder laser pump cavity and 3 pumping laser reflecting mirrors at three angles for being set to pumping cylinder laser pump cavity are used for Build pumping laser roundtrip optical path, CO2Laser back mirror is for reflecting CO2Laser, CO2Laser output mirror is for exporting CO2Laser.
The beneficial effects of the present invention are:
(1) the invention proposes a kind of picosecond terawatt (TW) CO that pumping sequence band gain is mixed based on electric light2Laser amplifier, By carrying out optical pumping while discharge excitation, the spy of sequence band gain spectrum and conventional belt gain spectrum juxtaposition is utilized Property encryption gain spectral realize continuous spectrum picosecond CO so that hybrid gain broadening of spectral lines2Pulse amplifying；
(2) proposed by the present invention picosecond of terawatt (TW) CO2Laser amplifier utilizes sequence band gain spectrum and conventional belt gain spectral The characteristic of line juxtaposition slows down the frequency spectrum separating phenomenon after pulse warp, avoids laser energy that from capable of being assigned to the simple venation of input Punching is split into a series of discrete ps pulses after being modulated cause the energy of single ps pulse too low up, improves ultrashort pulse Amplification efficiency.
Detailed description of the invention
In order to more clearly explain the technical solutions in the embodiments of the present application, make required in being described below to embodiment Attached drawing is briefly described, it should be apparent that, the drawings in the following description are only some examples of the present application, for For those of ordinary skill in the art, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is CO provided by the invention2The structural schematic diagram of laser amplifier pump arrangement；
Fig. 2 (a) is CO provided by the invention2The CO of laser amplifier pump arrangement2Molecule 0003 sequence bands and 0001 is conventional Band spectral line schematic diagram；
Fig. 2 (b) is CO provided by the invention2The CO of laser amplifier pump arrangement2Molecule 0003 sequence bands and 0001 is conventional Juxtaposition schematic diagram with gain spectral in 10.6 μm of regions；
Fig. 3 is CO provided in an embodiment of the present invention2The structural schematic diagram of laser amplifier；
Fig. 4 is CO provided in an embodiment of the present invention2The structural schematic diagram of the laser resonator of laser amplifier；
Fig. 5 (a)~(c) is CO provided in an embodiment of the present invention2The effect picture of laser amplifier pump arrangement.
Wherein, 1 is solid laser working substance crystal, and 2 is semiconductor pumped, and 3 swash for 1.47 μm of semiconductor pumped solids Light device, 4 be collimator, and 5 be pump light input window, and 6 be CO2Laser back mirror, 7 be gas discharge observation window, and 8 be water conservancy diversion Plate, 9 be main heat exchanger, and 10 be cathode, and 11 be CO2Laser output mirror, 12 be pumping cylinder laser pump cavity, and 13 be anode, and 14 are Light bridge, 15 be secondary heat exchanger, and 16 be blower, and 17 be energization input, and 18 be high-tension transformer, and 19 be high-voltage rectifier, 20 It is vacuum system for injection section, 21,22 be 1.47 μm of pumping lasers, and 23 be laser c O2Airflow direction, 24 be CO2Air-flow guiding Plate, 25 be pumping laser reflecting mirror, and 26 be laser outbound course, and 27 be pumping laser orientation of oscillation, and 28 be laser c O2Gas is put Electric area.
Specific embodiment
To keep the purposes, technical schemes and advantages of the embodiment of the present application clearer, below in conjunction with the embodiment of the present application In attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is Some embodiments of the present application, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art Every other embodiment obtained, shall fall in the protection scope of this application.
The present invention provides one kind picosecond terawatt (TW) CO2Laser amplifier pump arrangement, including pump laser module, laser are humorous Vibration chamber and electric pump module；The axis three of the axis of pump laser module, the direction of an electric field of electric pump module and laser resonator Person is orthogonal and intersects at the center of laser resonator；Pump laser module is for pumping CO2Molecule 0003 sequence bands；Electric pump Pu module is for pumping CO2Molecule 0001 conventional belt；Laser resonator is pumped simultaneously by pump laser module and electric pump module Method, make hybrid gain broadening of spectral lines using spectral line juxtaposition, for realizing laser output.
As shown in Figure 1, pump laser module includes the diode pumped solid state laser 3 being sequentially coaxially arranged and collimator 4, the pump light that collimator 4 is used to generate the diode pumped solid state laser 3 collimates.As shown in Fig. 2, CO2Molecule is inhaled It receives in spectrum from ground state 0000 arrives sequence band 0003 transition has a stronger Absorption Line, and the corresponding optical wavelength of the spectral line is about 1.47 μm, therefore pumped using 1.47 μm of diode pumped solid state lasers 3.The Cr that solid high-efficiency gain media uses4+: YAG is the efficient gain media of ideal near-infrared wavelength work, and the Nd:YAG that pumping source uses has small in size, efficiency High advantage.
Electric pump module includes cathode 10 and anode 13, is added high pressure between cathode 10 and anode 13, cathode 10 and anode 13 in laser c O2It discharges gas-discharge zone 28.
Laser resonator includes pumping cylinder laser pump cavity 12,3 pumping laser reflecting mirrors 25, CO26 He of laser back mirror CO2Laser output mirror 11；3 pumping lasers of pumping cylinder laser pump cavity 12 and three angles for being set to pumping cylinder laser pump cavity 12 Reflecting mirror 25 for building pumping laser roundtrip optical path, by pump light is limited in laser resonance intracavitary, CO2Laser back reflection Mirror 6 is for reflecting CO2Laser forms pumping laser orientation of oscillation 27, CO2Laser output mirror 11 is for exporting CO2Laser.
Wherein, in CO2Under laser operating status, diode pumped solid state laser 3 exports pumping laser, passes through collimation Device 4 collimates pump light, enters laser resonator, pumping laser reflecting mirror 25 and pumping laser column by pump light input window Pump light is limited in the intracavitary roundtrip of laser resonance by face chamber 12, is formed pumping laser orientation of oscillation, is made CO2Molecular transition arrives 0003 energy levels obtain sequence band gain spectral.Meanwhile mixed gas inputs laser resonator, electric control part by injection section 20 Control blower 16 recycles gas, and high-tension transformer 18 and high-voltage rectifier 19 are that cathode 10 and anode 13 provide high pressure, passes through Cathode 10 and anode 13 are in laser c O2Laser discharge area 28 discharges, and makes CO2Molecular transition is to 0001 energy level obtains conventional belt gain Spectrum.The present embodiment constructs the continuous spectrum CO of an efficient pulse electric light pumping2Laser amplifier, in 3ps, 1nJ Seed light input condition under, obtain 3ps pulsewidth and 10mJ grades of pulse CO2Laser output, puts for next stage power amplifier Ideal seed source is provided greatly.
As shown in figure 5, when using electric light mixing pumping, it is seen that the broadening of hybrid gain spectral line is more obvious, arteries and veins Frequency spectrum separating phenomenon after punching warp is slowed down, and time domain impulse division is reduced, and the energy of main peak is bigger, the contrast with secondary lobe It is more and more obvious.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include Within protection scope of the present invention.

Claims (6)

1. one kind picosecond terawatt (TW) CO2Laser amplifier pump arrangement, which is characterized in that including pump laser module, electric pump module And laser resonator；
The axis three of the axis of the pump laser module, the direction of an electric field of the electric pump module and the laser resonator Center that is orthogonal and intersecting at the laser resonator；
The pump laser module is for pumping CO2Molecule 0003 sequence bands；The electric pump module is for pumping CO2Molecule 0001 Conventional belt；The method that the laser resonator is pumped simultaneously by the pump laser module and the electric pump module, utilizes Spectral line juxtaposition makes hybrid gain broadening of spectral lines, for realizing laser output.
2. CO according to claim 12Laser amplifier pump arrangement, which is characterized in that the pump laser module includes The diode pumped solid state laser (3) and collimator (4) being sequentially coaxially arranged；
The pump light that the collimator (4) is used to generate the diode pumped solid state laser (3) collimates.
3. CO according to claim 1 or 22Laser amplifier pump arrangement, which is characterized in that described semiconductor pumped solid The solid laser working substance crystal of body laser (3) is Cr4+: YAG.
4. CO according to claim 1 or 22Laser amplifier pump arrangement, which is characterized in that described semiconductor pumped solid The pumping source of body laser (3) is semiconductor laser, efficient Yb optical-fiber laser or Nd:YAG laser.
5. CO according to claim 12Laser amplifier pump arrangement, which is characterized in that the electric pump module includes yin Pole (10) and anode (13), add high pressure electric discharge between the cathode (10) and anode (13).
6. CO according to claim 12Laser amplifier pump arrangement, which is characterized in that the laser resonator includes pump Pu cylinder laser pump cavity (12), 3 pumping laser reflecting mirrors (25), CO2Laser back mirror (6) and CO2Laser output mirror (11)；
Pumping cylinder laser pump cavity (12) and 3 pumpings for being set to three angles for pumping cylinder laser pump cavity (12) Laser mirror (25) is for building pumping laser roundtrip optical path, the CO2Laser back mirror (6) is for reflecting CO2Swash Light, the CO2Laser output mirror (11) is for exporting CO2Laser.
CN201811522907.9A 2018-12-12 2018-12-12 One kind picosecond terawatt (TW) CO2Laser amplifier pump arrangement Expired - Fee Related CN109462137B (en)

Priority Applications (2)

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CN201811522907.9A CN109462137B (en) 2018-12-12 2018-12-12 One kind picosecond terawatt (TW) CO2Laser amplifier pump arrangement
PCT/CN2019/072301 WO2020118864A1 (en) 2018-12-12 2019-01-18 Picosecond terawatt co2 laser amplifier pumping device

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CN201811522907.9A CN109462137B (en) 2018-12-12 2018-12-12 One kind picosecond terawatt (TW) CO2Laser amplifier pump arrangement

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101557072A (en) * 2008-04-09 2009-10-14 叶日文 Laser resonant cavity with high power
US20130003774A1 (en) * 2011-06-29 2013-01-03 Robert Neil Campbell CO2 laser
CN105261923A (en) * 2015-11-06 2016-01-20 华中科技大学 A semiconductor pump discharge gas laser device
CN106129792A (en) * 2016-07-15 2016-11-16 华中科技大学 The resonant check lateral light pump arrangement of a kind of metastable state gas laser and method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4249139A (en) * 1977-12-19 1981-02-03 Jersey Nuclear-Avco Isotopes, Inc. CO2 laser emitting at 16 microns in 02°0-01'0 transition
DE3104229A1 (en) * 1981-02-06 1982-08-19 Kraftwerk Union AG, 4330 Mülheim METHOD FOR GENERATING LASER BEAMS IN THE 16 (ARROW DOWN) / (ARROW DOWN) AROUND THE WAVELENGTH AREA
CN104466639A (en) * 2014-12-17 2015-03-25 中国人民解放军国防科学技术大学 Intermediate infrared gas laser of multi-wavelength overtone cascade time sequence laser pump

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101557072A (en) * 2008-04-09 2009-10-14 叶日文 Laser resonant cavity with high power
US20130003774A1 (en) * 2011-06-29 2013-01-03 Robert Neil Campbell CO2 laser
CN105261923A (en) * 2015-11-06 2016-01-20 华中科技大学 A semiconductor pump discharge gas laser device
CN106129792A (en) * 2016-07-15 2016-11-16 华中科技大学 The resonant check lateral light pump arrangement of a kind of metastable state gas laser and method

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