CN110071421A - A kind of system and method generating femtosecond seed light - Google Patents
A kind of system and method generating femtosecond seed light Download PDFInfo
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- CN110071421A CN110071421A CN201810059540.5A CN201810059540A CN110071421A CN 110071421 A CN110071421 A CN 110071421A CN 201810059540 A CN201810059540 A CN 201810059540A CN 110071421 A CN110071421 A CN 110071421A
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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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10061—Polarization control
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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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10084—Frequency control by seeding
- H01S3/10092—Coherent seed, e.g. injection locking
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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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
- H01S3/1083—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering using parametric generation
-
- 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
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
- H01S3/109—Frequency multiplication, e.g. harmonic generation
Abstract
A kind of system and method generating femtosecond seed light, including signal optical source, pump light source, signal light generation module and pump light generation module, signal light generation module includes cross polarization wave generation device (3) and optically erasing device (6)；Pump light generation module includes time-delay mechanism (4) and frequency doubling device (5)；Signal optical source output beam enters optically erasing device as signal light (100) after cross polarization wave generation device, pump light source output beam enters optically erasing device as pump light (200) after time-delay mechanism, frequency doubling device, signal light (100), pump light (200) generate ideler frequency light (300) by optically erasing device, and ideler frequency light (300) is used as seed light.The present invention generates cross polarization wave generates ideler frequency light as seed light in conjunction with femtosecond optical parametric amplification, carries out shaping without hollow optic fibre, without introducing vacuum system, has the characteristics that structure is simple, easy to adjust, efficiently easy.
Description
Technical field
The present invention relates to ultrashort laser pulse field, especially a kind of system and method for generating femtosecond seed light are based on
Cross polarization wave generates with the ideler frequency light in femtosecond optical parametric amplification and promotes chirped pulse amplification device contrast.
Background technique
The invention of chirped pulse amplification (CPA) technology is that ultrashort and ultrahigh laser opens new road.From twentieth century nine
Since the ten's, CPA technology has obtained swift and violent development, and many research institutions are all built in the world at present has erected based on chirp
Hundreds of terawatt (TW)s (TW) of pulse amplifying technology even number claps the laser aid of watt (PW) magnitude.The laser dress of such high-peak power
It is set to the mankind and provides unprecedented laboratory facilities and extreme physical condition, be conducive in depth study objective world rule.
However under so high peak power, when high-order harmonics spectrum, the biggish noise of pulse front edge intensity may be first
It has an effect in main pulse and target surface, Pre-plasma is generated, to destroy the physical mechanism of high-order harmonics spectrum.This
The importance for allowing for laser pulse temporal signal-to-noise ratio (being defined as main pulse intensity and prepulsing intensity ratio) is more and more prominent.
Contrast ration problem widely causes the concern of major research institution in recent years, various for comparing
The pulse cleaning technology that degree is promoted also accordingly is born.Wherein, based on the pulse cleaning technology before stretcher because of its brilliant performance
And it is widely used.Currently, the method for improving laser contrast ration has saturable absorption body technique (SA), cross polarization wave
(XPW), femtosecond optical parametric amplification (OPA), plasma somascope etc..These technologies respectively have advantage and disadvantage, such as saturable absorber skill
Art is a kind of simple traditional method, but promotion contrast is indifferent, can only promote the 1-2 order of magnitude；Utilize plasma
Somascope promotion contrast transformation efficiency is lower, and parameter is difficult to control, and at high cost, and contrast is generally promoted 2-3 quantity
Grade；Cross polarization wave generation technology develops comparatively fast in recent years, this is technically simple easy, can stretched-out spectrum, but signal-to-noise ratio promoted energy
Power is limited to the extinction ratio of analyzer, while transfer efficiency is lower, and output energy is lower, generally contrast can be promoted 4-5
A order of magnitude；Femtosecond optical parameter amplifying technique gets rid of the limitation of polarizing film extinction ratio, obtains big energy stabilization output, but fly
The second contrast hoisting power of optical parametric amplification can be limited to gain amplifier.
Summary of the invention
Have in first technology and various technologies be combined with each other the promotion realized to laser pulse contrast, for example sends out for 2014
Document " the High temporal contrast frontend with optical parametric amplifier of table
for high powerful femtosecond laser”(Optics&Laser Technology 57(2014)165–168)
And Chinese patent disclosed in 2015 (103208734 A of CN) proposes to use hollow optic fibre+cross polarization wave generation technology+base
In the femtosecond optical parametric amplification of signal light, this technology is in order to realizing that the promotion of optical quality introduces hollow optic fibre to defeated
The pulsed light entered is filtered shaping, but the introducing of hollow optic fibre keeps structure more complicated, not only adjusting not easy to operate, but also makes
The light path for obtaining signal light greatly increases, and the longer time-delay mechanism of light path is just needed to carry out the optical path of optically erasing pump light accordingly
Adjustment, and the light path of optically erasing pump light increases, and the space of pump light can be reduced in transmission process free over long distances
Beam quality.In addition it is used cooperatively with vacuum environment so that the cost and complexity of device greatly increase, and hollow light
Fine transmission efficiency can reduce the energy conversion efficiency of device usually 70% or so.In addition, since cross polarization wave generates dress
Work is set under lower injected pulse energy condition, and is generally all under higher Implantation Energy, no using hollow optic fibre
The room for promotion of contrast is only limited, and nonlinear crystal can be damaged, largely effects on the sex work steady in a long-term of device.
(CN 105790045A, big energy period magnitude superelevation signal-to-noise ratio femtosecond seed pulse generate dress to Chinese patent disclosed in 2016
Set) it not only additionally introduces all solid state broadening system spectrum is broadened, spectral width 650-950nm, and by introduced
Vitreous silica key group Dispersion Compensation Systems be located at light beam and enter before cross polarization wave generation device, to passing through cross polarization
Signal light after generation device does not carry out accurate dispersion compensation, be unfavorable in subsequent optical parameter amplification system signal light with
The time domain of pump light matches, to influence the energy conversion efficiency of optical parameter amplification system.In addition, system seed obtained
Source is the period magnitude signal light that pulsewidth is less than 10fs, and obtained is big energy pulse.
Document " the Ultrashort pulse temporal contrast enhancement based delivered for 2012
on noncollinear optical-parametric ampl ification”(Optics Letters 36(5),
2011)、“Enhancement of Amplified Spontaneous Emission Contrast With a Novel
Front-End Based on NOPA and SHG Processes”(IEEE Journal of Quantum
Electronics, 48 (4), 2012,516-520) and 2010 disclosed in Chinese patent (CN 101625500A) embodiment
In refer to and participate in subsequent optically erasing as seed light or participate in subsequent chirped pulse as seed light to swash using ideler frequency light
Light amplification, but the apparatus structure is complicated, the seed pulse (WLC) of a super continuous spectrums need to be generated, then using WLC as seed light
First order optically erasing is injected, signal light of the ideler frequency light of 1600nm as second level optically erasing is exported, it is defeated after amplification
The signal light of 1600nm out still needs to the seed light for becoming 800nm by frequency multiplication later.In addition, the device has one very big lack
Fall into: during frequency multiplication, the spectrum of pulse can sharply become smaller, and the pulsewidth of the device is difficult to meet subsequent usually in 40fs or so
Requirement of the amplifier to broadband spectral and more narrow pulse width.
In order to solve, the existing method promotion order of magnitude for improving contrast of ultrashort pulse is few, transformation efficiency is low, device tune
The technical problem that examination is complicated, stability is low, the present invention is by cross polarization wave generation technology in conjunction with femtosecond optical parametric amplification
Get up to generate the ideler frequency light of superelevation signal-to-noise ratio, and participates in subsequent chirped pulse amplification process for the ideler frequency light as seed light.
The generation of cross polarization wave can improve contrast, stretched-out spectrum, and optically erasing device is able to achieve broadband, big energy, superelevation comparison
The ideler frequency light output of degree can satisfy high-peak power laser aid to the great demand of high quality seed pulse.Therefore the present invention
There are three features for the ideler frequency light ratioing signal light of output: (1) contrast of Noise Background is higher by several quantity than signal light
Grade；(2) there is theoretically no prepulsing or trailing edges before and after the main pulse of ideler frequency light, and prepulsing or trailing edge are through over-discharge
After big adverse effect can be caused to related experiment；(3) ideler frequency light is generated during optically erasing, not by intersecting
Wave generation device is polarized, therefore the nonlinear effect (such as B integral) accumulated during the generation of ideler frequency light can seldom have
Higher space-time quality.In the present system, since cross polarization wave generation device works in lower injected pulse energy condition
Under, nonlinear crystal not easy damaged is conducive to the long-term working stability for exporting higher spatial beam quality and lifting device,
And spatial beam shaping and vacuum plant are carried out without using hollow optic fibre, it does not need to introduce vacuum plant yet, also avoid
The labyrinth of double optically erasings, design, development and the operation and maintenance of system are simpler easy.Therefore the present invention is not only
It is at low cost, and have the characteristics that structure is simple, easy to adjust, efficiently easy, practical.
Specific technical solution of the invention is as follows:
A kind of system generating femtosecond seed light, comprising: signal optical source, pump light source, signal light generation module and pumping
Light generation module；The signal light generation module includes cross polarization wave generation device (3) and optically erasing device (6)；Institute
Stating pump light generation module includes time-delay mechanism (4) and frequency doubling device (5)；Signal optical source output beam is produced by cross polarization wave
Enter optically erasing device as signal light (100) after generating apparatus, pump light source output beam is filled by time-delay mechanism, frequency multiplication
It postpones and enters optically erasing device as pump light (200), adopted with the signal light (100) for entering optically erasing device (6)
Ideler frequency light (300) are generated with the nearly degeneracy mode of I class.
The pump light generation module includes at least a time-delay mechanism.
Described to use the nearly degeneracy mode of I class be the polarization orthogonal of signal light in pump light, and the wavelength of signal light is pump
2 times of Pu optical wavelength.
The ideler frequency light (300) is offset signal light (100), pump light (200) in optically erasing crystal output beam
The newly generated three-beam of input direction.
The ideler frequency light is as seed light.
The ideler frequency light participates in subsequent chirped pulse amplification process or optically erasing process as seed light.
Pulsewidth >=14fs of the ideler frequency light.
The spectral width range 720nm-880nm of the ideler frequency light.
Pulse energy >=50uJ of the ideler frequency light.
The signal optical source and pump light source are obtained by same femtosecond laser light source by beam splitting.
The beam splitting is realized by divided beam system.
The divided beam system includes beam splitting chip.
The femtosecond laser light source is chirped pulse amplification femtosecond laser.
The pulsewidth of the laser pulse of the femtosecond laser output is one of 20fs-200fs, it is preferable that is
40fs。
The energy range of the laser pulse of the femtosecond laser output is >=2mJ, it is preferable that is 3-6mJ.
The cross polarization wave generation device includes the first polariscope, the second polariscope, focusing device and at least one friendship
It pitches polarized wave and generates crystal.
It is BaF2 crystal or CaF2 crystal that the cross polarization wave, which generates crystal,.
It is 0.5mm-2.5mm that the cross polarization wave, which generates crystal thickness, it is preferable that is 1mm-1.5mm.
The cross polarization wave generates crystal work under non-vacuum.
First polariscope and the second polariscope are Glan prism.
The frequency doubling device includes frequency-doubling crystal, the first dichroic mirror, the second dichroic mirror.
The frequency-doubling crystal is beta-barium metaborate crystal (BBO) crystal, lithium triborate crystal (LBO), bismuth borate crystal
(BIBO) or potassium titanyl oxygenic phosphate(KTP) crystal (KTP).
The frequency-doubling crystal with a thickness of≤2mm, it is preferable that be 0.5mm-1mm.
First dichroic mirror, vitreous silica, K9 glass, the CaF2 glass that the second dichroic mirror is plated film, to frequency doubled light height
Instead, fundamental frequency light is high thoroughly, reflectivity >=95%, transmitance >=95%.
The optically erasing device includes optically erasing crystal.
The optically erasing crystal is beta-barium metaborate crystal (BBO), lithium triborate crystal (LBO), bismuth borate crystal
(BIBO) or potassium titanyl oxygenic phosphate(KTP) crystal (KTP).
The optically erasing crystal thickness is≤2mm, it is preferable that is 0.5mm.
The time-delay mechanism includes at least a pair of of total reflective mirror, and Adjustment precision reaches micron dimension.
The focusing device includes concave mirror and convex mirror.
The focal length of the focusing device concave mirror is 0.4-1m, it is preferable that is 0.5m；The coke of the focusing device convex mirror
Away from for-0.1-- 0.2m, it is preferable that be-0.1m.
The focusing device includes convex lens.
The focal length of the focusing device convex lens is 0.5-2m, it is preferable that is 1m.
The laser pulse purification device further includes at least one sheet glass and/or chirped mirror, is located at cross polarization wave and produces
Between generating apparatus and optically erasing crystal.
Chirped mirror reflection efficiency >=99% compensates bandwidth >=100nm, realizes the phase compensation to signal light.
The present invention also provides a kind of methods for generating femtosecond seed light: signal optical source output beam passes through cross polarization wave
Generation device carries out spectrum widening and contrast is promoted, and then enters optically erasing device as signal light (100)；Pump light
Source output beam enters frequency doubling device, generates frequency doubled light, and the frequency doubled light is filled as pump light (200) into optically erasing
It sets, with the signal light (100) for entering optically erasing device using the nearly degeneracy mode of I class, obtains ideler frequency light (300), the spare time
Frequency light (300) is seed light.
The signal light energy range into optically erasing device is≤25uJ, it is preferable that is 5-15uJ.
Described is controlled into the signal optical dispersion in optically erasing crystal by chirped mirror pair and/or sheet glass,
The chirped mirror pair and/or sheet glass, can be by changing between cross polarization wave generation system and optically erasing crystal
Become the thickness of sheet glass to adjust the dispersion of the signal light generated after cross polarization wave generation system, makes signal light and pumping
Light realizes optimal time domain matching.
The glass sheet thickness for adjustment signal optical dispersion is≤8mm.
In the method, by the spectrum phase and energy of the pulse laser of control laser aid output, make the intersection
The even cunning of output spectrum that polarized wave generates process is broadened without modulation, and compared with input spectrum, without additionally introducing spectrum
Broaden device.
In the method, the energy by the pulse laser of control laser aid output is to generate dress into cross polarization wave
Pulse energy≤the 250uJ set, it is preferable that for≤150uJ.
In the method, the angle between pump light and signal light is controlled, makes spatially separate signal light and ideler frequency
Light.The value of this angle to comprehensively consider transfer efficiency, ideler frequency light space chirp, signal light ideler frequency light separation difficulty etc. because
Element.
In the method, the angle between control pump light and the signal light is≤3 °, it is preferable that is 1 °.
Compared with first technology, the present invention has following distinguishing feature:
1. the present apparatus combines the advantage of cross polarization wave generation technology respectively with femtosecond optical parameter amplifying technique: intersecting
Polarized wave generation can improve contrast, stretched-out spectrum, and optically erasing device is able to achieve broadband, big energy, superelevation contrast
Ideler frequency light output can satisfy high-peak power laser aid to the great demand of high quality seed pulse.
2. the present invention can be realized cross polarization wave generation device and work under lower injected pulse energy condition, same
The limitation promoted to contrast ration is not only avoided in the case where Deng output energy, and nonlinear crystal will not damage, dress
The long-term working stability set significantly improves.
3. the ideler frequency light Noise Background contrast that the present invention generates is higher by multiple orders of magnitude than signal light, and main pulse
Front and back along there is no prepulsing or after prolong pulse, adverse effect will not be caused to related experiment, and the ideler frequency light is in light
It being generated in parametric amplification, the nonlinear effect (such as B integral) accumulated seldom can have higher space-time quality,
The seed source of high-quality can be provided for subsequent chirped pulse laser amplification device or optically erasing device.
4. the configuration of the present invention is simple does not use hollow optic fibre, and does not need to introduce vacuum plant, not only at low cost, and
And debugging is simple and convenient, it is easy to accomplish.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to do simply to introduce, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1: simplified basic diagram of the invention；100: signal light；200: pump light；300: ideler frequency light.
The simplified basic diagram of the nearly degeneracy amplification mode of Fig. 2: I class.
Fig. 3: the system structure diagram of the embodiment of the present invention.
Fig. 4: the time domain contrast of the ideler frequency light (300) of system final output and signal light (100) in embodiment.
Specific embodiment
It elaborates below to the embodiment of the present invention, the present embodiment carries out under the premise of the technical scheme of the present invention
Implement, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to following implementation
Example.
Referring to figure 3., Fig. 3 is the system structure diagram of the embodiment of the present invention.As seen from the figure, the dress of the embodiment of the present invention
Setting includes: 800nm kHz femtosecond laser device (1), beam splitting chip (2-1), by the first polariscope (3-1), the second polariscope (3-
2), the first cross polarization wave generate crystal BaF2 crystal (3-3), the second cross polarization wave generate crystal BaF2 crystal (3-6) and
The cross polarization wave generation device (3) of focusing device composition, is prolonged by what the first total reflective mirror (4-1), the second total reflective mirror (4-2) formed
When device (4), filled by frequency-doubling crystal bbo crystal (5-1), the first dichroic mirror (5-2), the second dichroic mirror (5-3), the frequency multiplication that forms
(5) are set, the optically erasing device (6) being made of optically erasing crystal bbo crystal (6-1).Wherein the focusing device by
First concave mirror (3-4), the first convex mirror (3-5) composition.The device further includes the first chirped mirror to (7), convex lens (8),
Two chirped mirrors are to (9), half-wave plate (10), third total reflective mirror (11), the 4th total reflective mirror (12), the second concave mirror (13), second convex
Face mirror (14), third dichroic mirror (15), aperture (16), sheet glass (17).
Specifically, the 3.9mJ seed light of 800nm kHz femtosecond laser device (1) output is through the beam splitting chip (2-1) point
For two beam laser, wherein beam of laser, energy 80uJ pass through the first polariscope (3- after the first chirped mirror is to (7) compensation
1), the first cross polarization is incident on after the face microscope group shrink beam being made of the first concave mirror (3-4) and the first convex mirror (3-5)
Wave generates crystal BaF2 (3-3), the second cross polarization wave generates crystal BaF2 (3-6) and the second polariscope (3-2), output polarization
State and the input orthogonal cross polarization wave 9uJ of light polarization state, the cross polarization wave planoconvex lens (8) collimation, second
After chirped mirror compensates (9), by sheet glass (17), then by passing through 800nm half-wave plate (10) after third total reflective mirror (11) reflection,
The optically erasing crystal bbo crystal (6-1), the signal light energy 5uJ injected are injected into as signal light.Experiment
In, by the energy of the pulse laser of control laser aid output, the pulse energy into cross polarization wave generation device is made to exist
It is all attempted within 250uJ, it is therefore preferable to≤150uJ.By changing the thickness of sheet glass come the dispersion of adjustment signal light,
Signal light is set to realize that optimal time domain most matches with pump light, in experiment, right≤8mm glass sheet thickness is all tested, this
Embodiment is preferably 5mm.
Another beam of laser, energy 3.8mJ, through the 4th total reflective mirror (12), the first total reflective mirror (4-1), the second total reflective mirror (4-2)
After reflection, injection BBO frequency-doubling crystal (5-1) carries out frequency multiplication and generates 400nm laser 1.8mJ, which successively passes through described
The first dichroic mirror (5-2), the second dichroic mirror (5-3) reflection after, by by the second concave mirror (13) and the second convex mirror (14)
The attenuator of composition is reflected through third dichroic mirror (15), and it is brilliant to be injected into the optically erasing crystal BBO as pump light
Body (6-1), the ideler frequency light generated after difference frequency filter out signal light and pump light by aperture (16), energy 100uJ, as
Seed light participates in subsequent chirped pulse amplification process.
First concave mirror (3-4) the focal length 0.5m, the first convex mirror (3-5) focal length -0.1m, the second concave mirror (13) are burnt
Away from 0.6m, the second convex mirror (14) focal length -0.3m, the first cross polarization wave generates crystal BaF2 crystal (3-3), the second intersection partially
It is 1.5mm, convex lens (8) focal length 0.6m, frequency-doubling crystal bbo crystal (5-1) that vibration wave, which generates crystal BaF2 crystal (3-6) thickness,
Thickness 1mm, the thickness 0.5mm of optically erasing crystal bbo crystal (6-1).Angle between pump light and signal light is about
It is 1 degree.Solid black lines shown in Fig. 4 are the ideler frequency light of the final output after cross polarization wave generation device and optically erasing device
(300), grey filled lines are the signal light (100) of final output.It can clearly be seen that by Fig. 4: compared with signal light, ideler frequency light
Without prepulsing and afterpulse, and there is better coherent contrast degree along 5ps before and after main pulse.Measuring instrument is limited to,
Dynamic range at present can only be to 10-10Range.But consider the mechanism of production of ideler frequency light, the time domain contrast of ideler frequency light will be remote
It is better than signal light.Moreover, because cross polarization wave generation device works under lower injected pulse energy condition, non-linear crystalline substance
Body will not damage, and the long-term working stability of device can be significantly improved.In addition, through cross polarization wave generation device and beche-de-mer without spike
Measure amplifying device after final output ideler frequency light be used as seed source, energy can to hundred it is micro- coke magnitudes, 720-880nm of energy spectrum width,
Pulsewidth is greater than 14 femtoseconds.
All references mentioned in the present invention is incorporated herein by reference, independent just as each document
It is incorporated as with reference to such.In addition, it should also be understood that, after reading the above teachings of the present invention, those skilled in the art can
To make various changes or modifications to the present invention, such equivalent forms equally fall within model defined by the application the appended claims
It encloses.
Claims (16)
1. a kind of system for generating femtosecond seed light characterized by comprising signal optical source, pump light source, signal light generate mould
Block and pump light generation module, it is characterised in that the signal light generation module includes cross polarization wave generation device (3) and light
Parameter amplifying device (6)；The pump light generation module includes time-delay mechanism (4) and frequency doubling device (5)；The signal optical source is defeated
Light beam enters the optically erasing device as signal light (100) after the cross polarization wave generation device out, described
Pump light source output beam enters the optical parameter as pump light (200) after the time-delay mechanism, the frequency doubling device
Amplifying device, the signal light (100), the pump light (200) generate ideler frequency light by the optically erasing device
(300)。
2. a kind of system as described in claim 1 for generating femtosecond seed light, which is characterized in that the ideler frequency light is as seed
Light.
3. a kind of as claimed in claim 2 system for generating femtosecond seed light, which is characterized in that the light source of the signal light with
The light source of the pump light is obtained by same femtosecond laser light source by beam splitting.
4. a kind of as claimed in claim 3 system for generating femtosecond seed light, which is characterized in that the femtosecond laser light source is
Chirped pulse amplification femtosecond laser.
5. a kind of system as described in claim 1 for generating femtosecond seed light, which is characterized in that the cross polarization wave generates
Device (3) includes that the first polariscope (3-1), the second polariscope (3-2), focusing device and at least one cross polarization wave generate crystalline substance
Body.
6. a kind of system as claimed in claim 5 for generating femtosecond seed light, which is characterized in that the cross polarization wave generates
Crystal works under non-vacuum.
7. a kind of system as claimed in claim 5 for generating femtosecond seed light, which is characterized in that the cross polarization wave generates
Crystal is BaF2 crystal or CaF2 crystal.
8. a kind of system as described in claim 1 for generating femtosecond seed light, which is characterized in that the frequency doubling device includes times
Frequency crystal (5-1), the first dichroic mirror (5-2) and the second dichroic mirror (5-3).
9. a kind of system as claimed in claim 8 for generating femtosecond seed light, which is characterized in that the frequency-doubling crystal (5-1)
For beta-barium metaborate crystal, lithium triborate crystal, bismuth borate crystal or potassium titanyl oxygenic phosphate(KTP) crystal.
10. a kind of system as described in claim 1 for generating femtosecond seed light, which is characterized in that the optically erasing dress
Setting (6) includes optically erasing crystal (6-1).
11. a kind of system as claimed in claim 10 for generating femtosecond seed light, which is characterized in that the optically erasing is brilliant
Body (6-1) is beta-barium metaborate crystal, lithium triborate crystal, bismuth borate crystal or potassium titanyl oxygenic phosphate(KTP) crystal.
12. a kind of system as described in claim 1 for generating femtosecond seed light, which is characterized in that further include at least one glass
Glass piece and/or chirped mirror, between the cross polarization wave generation device and optically erasing crystal.
13. a kind of as claimed in claim 12 system for generating femtosecond seed light, which is characterized in that the glass sheet thickness is
≤8mm。
14. a kind of method for generating femtosecond seed light, which is characterized in that signal optical source output beam is generated by cross polarization wave
Device (3) carries out spectrum widening and contrast is promoted, and then enters optically erasing device (6) as signal light (100)；Pumping
Light source output light beam enters frequency doubling device (5), generates frequency doubled light, and the frequency doubled light is put as pump light (200) into optical parameter
Big device (6), and enters the signal light (100) of optically erasing device (6) using the nearly degeneracy mode of I class, obtains ideler frequency light
(300), the ideler frequency light (300) is seed light.
15. a kind of method as claimed in claim 14 for generating femtosecond seed light, which is characterized in that described to enter cross polarization
Pulse energy≤250uJ of wave generation device.
16. a kind of method as claimed in claim 14 for generating femtosecond seed light, which is characterized in that put by the optical parameter
Angle after big device between the pump light (200) exported and the signal light (100) is≤3 °.
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