CN102545011A - Adjustment and control device and method for ultra intense and ultra short laser pulse super-continuum spectrum - Google Patents
Adjustment and control device and method for ultra intense and ultra short laser pulse super-continuum spectrum Download PDFInfo
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Abstract
The invention discloses an adjustment and control device and method for an ultra intense and ultra short laser pulse super-continuum spectrum. After passing through a variable attenuation sheet and a time delay line, a beam of laser G (t) irradiates to a concave mirror in parallel with another beam of laser G (f) passing through a movable reflector; and G (t) and G (f) are reflected through the concave mirror and then crossed and focused. In a plasma channel produced by laser filamentation, a space plasma grating is formed because of double light beam interference; the super-continuum spectrum produced during the filamentation can be enhanced by using the plasma grating; and control and transfer of the energy of the super-continuum spectrum between the two beams of laser can be realized. According to the method and the device provided by the invention, the spectrum of the ultra short pulse can be actively controlled in an ultra intense laser field; and an involved light path has a simple structure and is convenient for adjustment.
Description
Technical field
The present invention relates to the transmission and the spectrum widening of ultra-intense ultra-short laser pulse, particularly a kind of regulation device of ultra-intense ultra-short laser pulse super continuous spectrums and regulate and control method thereof.
Background technology
When ultra-intense ultra-short laser pulse transmits, become the silk effect in medium, form plasma channel and produce super continuous spectrums if the enough height of pulse energy will cause laser.Ultra-intense ultra-short laser pulse becomes silk under the state that freely transmits, help laser energy in the quite interior more stable transmission of long distance, so laser becomes the silk phenomenon to get more and more people's extensive concerning always.And become the super continuous spectrums of institute's association in the silk process also to have very big potential using value at laser.
From Alfano in 1970 and Shapiro observed super continuous spectrums in experiment since, people were just probing into its essence always and are developing its application simultaneously.S.L.Chin pointed out in 1999, was a kind of white light laser in fact from certain angle super continuous spectrums.This white light laser also is applied to numerous areas such as atmospheric remote sensing, laser pulse compression already.The problem that regular meeting faces in the concrete application of super continuous spectrums is how super continuous spectrums to be regulated and control, such as the time domain distribution that changes the super continuous spectrums pulse strength etc.
People such as I.S.Golubtsov in 2003 point out can control the generation (Quantum Electron.33 (2003) 525) that laser becomes silk process and super continuous spectrums through the initial phase of modulated laser pulse theoretically.People such as HAOZuo-Qiang in 2008 and ZHANG Jie have confirmed the influence (CHIN.PHYS.LETT.25 (2008) 1365) that the initial chirp of laser pulse becomes the silk super continuous spectrums to produce to laser in experiment.People such as Hui Yang in 2005 and Jie Zhang have also studied laser pulse and have become the dependence (Opt.Lett.30 (2005) 534) of the generation of super continuous spectrums in the silk process for laser polarization.Certainly through modes such as change peak-power of laser pulse, also can play certain modulating action to the super continuous spectrums that laser becomes silk to be produced.Yet above-mentioned technology formerly also just strengthens the super continuous spectrums that laser becomes silk to be produced to a certain extent, and must realize through the output pulse character that changes lasing light emitter.This obviously far can not satisfy various application demands, needs badly for laser to become the more how more effective regulate and control method of silk super continuous spectrums.
Summary of the invention
The object of the invention mainly is that application space plasma grating is realized the regulation and control to the ultra-intense ultra-short laser pulse super continuous spectrums, makes the super continuous spectrums energy transfer to another Shu Guang from a branch of light, and can strengthen the broadening effect that laser becomes spectrum in the silk process.Regulate and characteristics such as damage threshold height based on the plasma grating is convenient, this method has very big promotional value at aspects such as the transmission of ultra-intense ultra-short laser pulse and spectrum controls.
Technical solution of the present invention is following:
A kind of regulation device of ultra-intense ultra-short laser pulse super continuous spectrums; Its characteristics are; This device comprises titanium jewel femto-second laser; Outbound course at this titanium jewel femto-second laser is provided with first attenuator and beam splitting chip; This beam splitting chip is divided into transmitted light beam G (t) and folded light beam G (f) with beam of laser, and described transmitted light beam G (t) incides concave mirror through the second variable attenuation sheet and the time delay line be made up of the 4th speculum, the 5th speculum, the 6th speculum, the 7th speculum, second translation stage by described the 7th speculum output; Described folded light beam G (f) exports through first speculum, second speculum with after being installed in the 3rd speculum on first translation stage; Described transmitted light beam G (t) is parallel with folded light beam G (f) to be incided to intersect after reflection on the described concave mirror and focuses on; In laser becomes a plasma channel that is produced, owing to two-beam interference forms a space plasma grating.
Utilize the regulation device of above-mentioned ultra-intense ultra-short laser pulse super continuous spectrums to carry out the regulate and control method of ultra-intense ultra-short laser pulse super continuous spectrums, it is characterized in that comprising following content,
Through moving first translation stage (7); Change described folded light beam G (f) incoming position; Promptly change described folded light beam G (f) and transmitted light beam G (t) angle through between described concave mirror (14) reflection output two light beams, thereby confirm the effective interaction length L and the grating constant Λ of said space plasma grating (15);
Through on transmitted light beam G (t) incident direction, moving second translation stage (12); Make transmitted light beam G (t) and folded light beam G (f) equivalent optical path from the focusing of beam splitting chip (3) to two light beams intersection; Promptly become to make under the thread attitude two light beams to intersect the fluorescence intensity of focusing place and reach maximum, thereby explaining that two pulses interact already forms space plasma grating (15) at laser;
Through regulating the pulse energy of the second variable attenuation sheet (8) the said transmitted light beam G of change (t), can change the photo plasma refractive index change delta n in the said space plasma grating (15)
p
Through above-described various regulative modes, can effectively control the super continuous spectrums that ultra-intense ultra-short laser pulse becomes silk to be produced, realize enhancing and the transfer in various degree of super continuous spectrums energy.
Basic principle of the present invention is: femto-second laser pulse becomes silk will produce the passage that plasma forms in air, and dual-beam chiasma interference takes place in plasma channel, just can form a plasma grating, and its grating constant is:
Λ＝λ
0/[2sin(α/2)] (1)
In the formula: λ
0Be the chiasma interference Wavelength of Laser, α representes the cross angle of this two bundles laser.
The plasma grating can be realized Bragg diffraction for the incident light that wavelength and incidence angle meet certain condition, and the Bragg diffraction condition can be expressed as:
nλ＝2Λsin(θ
B) (2)
In the formula: n represents the order of diffraction inferior, and λ is a lambda1-wavelength, θ
BThe n level Bragg angle of representing this incident light.
By (1) and (2), can get the one-level Bragg angle and be:
The maximum angle of divergence of supposing two bundle chiasma interference laser for
if satisfy
So just can realize of the transfer of super continuous spectrums energy from a branch of light to another Shu Guang.Meanwhile laser becomes the spectrum widening effect of silk also to be able to strengthen.
For the incident laser that satisfies (2) and (4), the diffraction efficiency of plasma grating is:
Wherein: Δ n
pBe to modulate caused variations in refractive index amplitude, and L is the effective interaction length of the plasma grating relevant with factor such as two bundle laser cross angle α by plasma density.
With first compared with techniques, the present invention has following distinguishing feature:
1. light channel structure is simple, and is easy to operate, and the plasma grating has controllability, comes it is adjusted through modes such as angle between the change two-beam or pulsed laser energies, avoids supported type to install, and is suitable for job space.
2. because the high destructive threshold value of plasma grating can directly be controlled ultrashort laser pulse spectrum, strong instrument is provided in the ultra-intense laser field for the observing and controlling laser pulse becomes silk and super continuous spectrums thereof.
3. because the time-delay between the two-way laser pulse can accurate be controlled, therefore can realize active regulation and control to laser pulse time domain and frequency domain spectrum.
Description of drawings
Fig. 1 is the light channel structure block diagram of ultra-intense ultra-short laser pulse super continuous spectrums regulation device of the present invention.
Fig. 2 is the output laser spectroscopy of used titanium jewel femto-second laser.
Fig. 3 becomes the laser spectroscopy behind the silk broadening for the 0.5mJ pulse laser.
Fig. 4 is that 0.5mJ pulse and 0.5mJ impulsive synchronization are crossed as the super continuous spectrums that silk is produced.
Fig. 5 is that the 0.5mJ pulse intersects synchronously with the 0.1mJ pulse, when having only one the tunnel to become silk in the two-way pulse, shifts the spectrum that does not become the mercerising bundle afterwards through ultra Continuous Energy.
Embodiment
Through embodiment and accompanying drawing the present invention is described further below, but should limit protection scope of the present invention with this.
Please consult Fig. 1 earlier, Fig. 1 is the light channel structure block diagram of ultra-intense ultra-short laser pulse super continuous spectrums regulation device of the present invention.Visible by figure; This device of ultra-intense ultra-short laser pulse super continuous spectrums regulation device of the present invention comprises titanium jewel femto-second laser 1; Outbound course at this titanium jewel femto-second laser 1 is provided with first attenuator 2 and beam splitting chip 3; This beam splitting chip 3 is divided into transmitted light beam G (t) and folded light beam G (f) with the laser beam of titanium jewel femto-second laser 1 output; Described transmitted light beam G (t) incides concave mirror 14 through the second variable attenuation sheet 8 with by the 4th speculum 9, the 5th speculum 10 be positioned at the 6th speculum 11 on second translation stage 12, the time delay line that the 7th speculum 13 is formed by described the 7th speculum 13 output transmitted light beam G (t); Described folded light beam G (f) is through first speculum 4, second speculum 5 and be installed in the 3rd speculum 6 back outputs on first translation stage 7; Described transmitted light beam G (t) is parallel with folded light beam G (f) to be incided to intersect after reflection on the described concave mirror 14 and focuses on; In laser becomes a plasma channel that is produced, owing to two-beam interference forms a space plasma grating 15.
Described the 3rd speculum 6 is fixed on first translation stage 7, and this first translation stage 7 can move front and back on G (f) incident direction.
Described the 5th speculum 10 and the 6th speculum 11 are fixed on second translation stage 12, and this second translation stage 12 can move front and back on G (t) incident direction, changes the time delay of time delay line.
Said first attenuator 2 and second attenuator 8 are the variable attenuation sheet.
The concrete use step of above-mentioned ultra-intense ultra-short laser pulse super continuous spectrums regulation device is following:
(1) at first adjusts said first attenuator 2 and second attenuator 8, make described transmitted light beam G (t) after described concave mirror 14 focuses on, all can satisfy laser and become strand spare with folded light beam G (f).
(2) again through moving described first translation stage 7, change the parallel distance that incides light beam G (f) and G (t) before the described concave mirror 14, promptly adjust the angle of G (f) and G (t) intersection focusing after the concave mirror reflection.
(3) then through moving described second translation stage 12, make the fluorescence intensity of G (f) and G (t) intersection region maximum, two pulses this moment reach synchronously in time, and described space plasma grating 15 forms and super continuous spectrums is exerted an influence.
(4) then adjust the described second variable attenuation sheet 8, or move described first translation stage 7 and second translation stage 12, continue the observation super continuous spectrums and change.
Specific embodiment of the present invention: the full width at half maximum of titanium jewel femto-second laser output pulse is about 30fs, and the highest single pulse energy is about 5.3mJ, and the output laser spectroscopy is as shown in Figure 2.Adjust said first attenuator 2 and second attenuator 8, make the single pulse energy of G (f) and G (t) be 0.5mJ, promptly the pulse average power is 1.67P
Cr(the threshold power P of 30fs laser pulse self focusing in the air
CrBe about 10GW), G (f) has satisfied into strand spare with G (t).Through moving described first translation stage 7, G (f) and G (t) angle that intersection focuses on after concave mirror 14 reflections of focal length 15cm is 3.8 °.Through moving described second translation stage 12; Make two pulses reach synchronous in time; The gained super continuous spectrums is as shown in Figure 4, and the stretched-out spectrum when 0.5mJ simple venation among Fig. 3 is washed into thread is compared, and can find out that just described space plasma grating 15 becomes the humidification of mercerising spectrum widening for laser.Then adjust attenuator 8, make the single pulse energy of G (t) reduce to 0.1mJ, promptly average pulse power is about 0.33P
Cr, G this moment (t) no longer becomes silk, however still there is very big broadening in its spectrum, and as shown in Figure 5, this is to be shifted by described space plasma grating 15 caused super continuous spectrums energy to make so.
Claims (2)
1. the regulation device of a ultra-intense ultra-short laser pulse super continuous spectrums; It is characterized in that; This device comprises titanium jewel femto-second laser (1); Outbound course at this titanium jewel femto-second laser (1) is provided with first attenuator (2) and beam splitting chip (3); This beam splitting chip (3) is divided into transmitted light beam G (t) and folded light beam G (f) with the laser beam of the output of titanium jewel femto-second laser (1); Described transmitted light beam G (t) incides concave mirror (14) through the second variable attenuation sheet (8) and the time delay line be made up of the 4th speculum (9), the 5th speculum (10), the 6th speculum (11), the 7th speculum (13), second translation stage (12) by described the 7th speculum (13) output; Described folded light beam G (f) is through first speculum (4), second speculum (5) and be installed in the 3rd speculum (6) the back output on first translation stage (7); Described transmitted light beam G (t) is parallel with folded light beam G (f) to be incided to intersect after reflection on the described concave mirror (14) and focuses on; In laser becomes a plasma channel that is produced, owing to two-beam interference forms a space plasma grating (15).
2. utilize the regulation device of the described ultra-intense ultra-short laser pulse super continuous spectrums of claim 1 to carry out the regulate and control method of ultra-intense ultra-short laser pulse super continuous spectrums, it is characterized in that this method comprises the following steps:
1. through moving first translation stage (7); Change described folded light beam G (f) incoming position; Promptly change described folded light beam G (f) and transmitted light beam G (t) angle through between described concave mirror (14) reflection output two light beams, thereby confirm the effective interaction length L and the grating constant Λ of said space plasma grating (15);
2. through on transmitted light beam G (t) incident direction, moving second translation stage (12); Make transmitted light beam G (t) and folded light beam G (f) equivalent optical path from the focusing of beam splitting chip (3) to two light beams intersection; Promptly become to make under the thread attitude two light beams to intersect the fluorescence intensity of focusing place and reach maximum, thereby explaining that two pulses interact already forms space plasma grating (15) at laser;
3. through regulating the pulse energy of the second variable attenuation sheet (8) the said transmitted light beam G of change (t), can change the photo plasma refractive index change delta n in the said space plasma grating (15)
p
4. repeat above-mentioned steps,, realize enhancing and the transfer in various degree of super continuous spectrums energy with the super continuous spectrums that the control ultra-intense ultra-short laser pulse becomes silk to be produced.
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Cited By (14)
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| CN103138148A (en) * | 2013-02-22 | 2013-06-05 | 中国联合网络通信集团有限公司 | Device and method for expanding spectral widths |
| CN103645593A (en) * | 2013-12-31 | 2014-03-19 | 湖南大学 | Spatial light modulator based on laser plasma channel |
| CN103823309A (en) * | 2014-03-12 | 2014-05-28 | 南开大学 | Method and device for splitting beam of time-space distribution adjustable ultrashort laser pulses |
| CN103995362A (en) * | 2014-04-24 | 2014-08-20 | 南开大学 | Method and device for continuously adjusting pulse interval |
| CN104570377A (en) * | 2015-01-04 | 2015-04-29 | 中国科学院上海光学精密机械研究所 | Laser chirp pulse beam splitting loop optical grating compressor |
| CN105024270A (en) * | 2015-07-16 | 2015-11-04 | 中国工程物理研究院激光聚变研究中心 | Synchronization precise control method of ultra-short pulses in different angles at target point |
| CN105186278A (en) * | 2015-09-16 | 2015-12-23 | 深圳大学 | Wide-angle-intersected precise ultrashort pulse time synchronization system |
| CN105487320A (en) * | 2015-11-17 | 2016-04-13 | 长春理工大学 | Array filamentation device and method of femtosecond laser in transparent optical medium |
| CN105652355A (en) * | 2016-03-11 | 2016-06-08 | 华东师范大学 | Preparation method for plasma grating based on pulse polarization rotation |
| CN109672072A (en) * | 2017-10-17 | 2019-04-23 | 长春理工大学 | A kind of device and method generating femtosecond laser plasma channel array |
| CN111884026A (en) * | 2020-07-16 | 2020-11-03 | 电子科技大学 | Ultrashort laser pulse light source system with high repetition frequency |
| CN112539847A (en) * | 2020-11-04 | 2021-03-23 | 中国科学院上海光学精密机械研究所 | Large-caliber ultrashort pulse sampling device |
| CN113067243A (en) * | 2021-03-18 | 2021-07-02 | 苏州曼德特光电技术有限公司 | Fiber laser and high-energy femtosecond pulse generation method |
| CN115181942A (en) * | 2022-07-19 | 2022-10-14 | 重庆华谱科学仪器有限公司 | Plasma grating pulse laser deposition coating method |
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| CN103138148A (en) * | 2013-02-22 | 2013-06-05 | 中国联合网络通信集团有限公司 | Device and method for expanding spectral widths |
| CN103645593A (en) * | 2013-12-31 | 2014-03-19 | 湖南大学 | Spatial light modulator based on laser plasma channel |
| CN103645593B (en) * | 2013-12-31 | 2016-11-23 | 湖南大学 | Spatial light modulator based on laser plasma channel |
| CN103823309B (en) * | 2014-03-12 | 2016-05-04 | 南开大学 | Ultrashort laser pulse beam-splitting method and device that a kind of spatial and temporal distributions is adjustable |
| CN103823309A (en) * | 2014-03-12 | 2014-05-28 | 南开大学 | Method and device for splitting beam of time-space distribution adjustable ultrashort laser pulses |
| CN103995362A (en) * | 2014-04-24 | 2014-08-20 | 南开大学 | Method and device for continuously adjusting pulse interval |
| CN104570377A (en) * | 2015-01-04 | 2015-04-29 | 中国科学院上海光学精密机械研究所 | Laser chirp pulse beam splitting loop optical grating compressor |
| CN105024270A (en) * | 2015-07-16 | 2015-11-04 | 中国工程物理研究院激光聚变研究中心 | Synchronization precise control method of ultra-short pulses in different angles at target point |
| CN105186278A (en) * | 2015-09-16 | 2015-12-23 | 深圳大学 | Wide-angle-intersected precise ultrashort pulse time synchronization system |
| CN105186278B (en) * | 2015-09-16 | 2018-06-26 | 深圳大学 | The system of ultrashort pulse time precision synchronous that wide-angle intersects |
| CN105487320B (en) * | 2015-11-17 | 2019-05-10 | 长春理工大学 | Array filament forming device and method of the femtosecond laser in transparent optical medium |
| CN105487320A (en) * | 2015-11-17 | 2016-04-13 | 长春理工大学 | Array filamentation device and method of femtosecond laser in transparent optical medium |
| CN105652355A (en) * | 2016-03-11 | 2016-06-08 | 华东师范大学 | Preparation method for plasma grating based on pulse polarization rotation |
| CN109672072B (en) * | 2017-10-17 | 2021-01-01 | 长春理工大学 | Device and method for generating femtosecond laser plasma channel array |
| CN109672072A (en) * | 2017-10-17 | 2019-04-23 | 长春理工大学 | A kind of device and method generating femtosecond laser plasma channel array |
| CN111884026A (en) * | 2020-07-16 | 2020-11-03 | 电子科技大学 | Ultrashort laser pulse light source system with high repetition frequency |
| CN112539847A (en) * | 2020-11-04 | 2021-03-23 | 中国科学院上海光学精密机械研究所 | Large-caliber ultrashort pulse sampling device |
| CN112539847B (en) * | 2020-11-04 | 2022-06-28 | 中国科学院上海光学精密机械研究所 | Large-caliber ultrashort pulse sampling device |
| CN113067243A (en) * | 2021-03-18 | 2021-07-02 | 苏州曼德特光电技术有限公司 | Fiber laser and high-energy femtosecond pulse generation method |
| CN113067243B (en) * | 2021-03-18 | 2022-07-29 | 苏州曼德特光电技术有限公司 | Fiber laser and high-energy femtosecond pulse generation method |
| CN115181942A (en) * | 2022-07-19 | 2022-10-14 | 重庆华谱科学仪器有限公司 | Plasma grating pulse laser deposition coating method |
| CN115181942B (en) * | 2022-07-19 | 2024-04-02 | 重庆华谱科学仪器有限公司 | Plasma grating pulse laser deposition coating method |
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