CN106229797A - For producing the fiber optic loop time lens combination of STUD pulse - Google Patents
For producing the fiber optic loop time lens combination of STUD pulse Download PDFInfo
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- CN106229797A CN106229797A CN201610781421.1A CN201610781421A CN106229797A CN 106229797 A CN106229797 A CN 106229797A CN 201610781421 A CN201610781421 A CN 201610781421A CN 106229797 A CN106229797 A CN 106229797A
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- Prior art keywords
- pulse
- photoswitch
- fiber optic
- stud
- optic loop
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0057—Temporal shaping, e.g. pulse compression, frequency chirping
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0927—Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21B—FUSION REACTORS
- G21B1/00—Thermonuclear fusion reactors
- G21B1/11—Details
- G21B1/23—Optical systems, e.g. for irradiating targets, for heating plasma or for plasma diagnostics
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/10—Nuclear fusion reactors
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- General Physics & Mathematics (AREA)
- Lasers (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
A kind of fiber optic loop time lens combination for producing STUD pulse, use single mode continuous light laser instrument as light source, feature is also to include the first photoswitch, Arbitrary Waveform Generator, the second photoswitc, ytterbium doped optical fiber amplifier, band filter, the 3rd photoswitch, phase-modulator and grating pair；Present system is simple for structure, it is possible not only to directly be produced, by a photoswitch, the Gao Zhongying super Gaussian pulse that pulsewidth is shorter, and the spectrum of the light pulse through fiber optic loop can be carried out broadening, can also be compressed by the laser pulse after spectrum widening by grating, produce the ultrashort laser super Gaussian pulse (STUD pulse) with precipitous rising edge or trailing edge, and the width of spectrum, the width of pulse and rising edge of a pulse are the most adjustable.STUD pulse can be used for suppressing parametric instability during Laser Driven inertial confinement fusion, has the features such as technology novel, simple for structure (all-fiber).
Description
Technical field
The present invention relates to ultrashort laser pulse, a kind of fiber optic loop time lens system for producing STUD pulse
System, this system can export scalable, the STUD pulse of high repetition frequency and ultra-short pulse laser expeditiously.
Background technology
At present, parametric instability (stimulated Raman scattering, stimulated Brillouin scattering, filamentation etc.) is finally to limit laser to drive
The one of the main reasons of dynamic inertial confinement fusion.In order to suppress parametric instability, various countries scientist proposes spectrum in succession
A series of beam smoothing methods such as the even cunning of dispersion, polarization smoothing, continuous phase plate.They are divided by the dimensional energy of uniform beam
Cloth, allows light beam focal spot quickly move at target surface, efficiently avoid speck filamentation, it is suppressed that parametric instability.But due to
Higher with the plasma density of internal ring laser action, the parametric instability that laser produces is higher, only with beam smoothing side
Method is inadequate.
Through the retrieval of prior art is found, at the Acta Optica (Optics of volume 32 o. 11th on the 1st June in 2007
Letters) there is an entitled " Generation of 3.5nJ femtosecond pulses from a on
Continuous-wave laser without mode locking " (use continuous laser to produce 3.5nJ without locked mode method
Femtosecond pulse) paper, describe and a kind of produce Gao Zhongying femtosecond pulse based on Direct Phase modulation and grating compress technique
Method.But this article does not propose to produce the ultrashort super Gaussian pulse (hereinafter referred to as STUD pulse) with precipitous rising edge
Method.
STUD pulse can effectively suppress the stimulated Raman scattering during laser-plasma interaction and be excited
The accumulation of the parametric instabilitys such as Brillouin scattering.Q without view or mode-locking technique are all difficult to obtain preferable STUD pulse.
Summary of the invention
The present invention is directed to above-mentioned the deficiencies in the prior art, it is provided that a kind of fiber optic loop time lens for producing STUD pulse
System, this system is possible not only to directly be produced, by a photoswitch, the Gao Zhongying super Gaussian pulse that pulsewidth is shorter, and permissible
The spectrum of the light pulse through fiber optic loop is carried out broadening, it is also possible to carried out by the laser pulse after spectrum widening by grating
Compression, produces the ultrashort laser super Gaussian pulse (STUD pulse) with precipitous rising edge or trailing edge, and the width of spectrum, arteries and veins
Width and the rising edge of a pulse of punching are the most adjustable.STUD pulse can be used for suppressing Laser Driven inertial confinement fusion process
Middle parametric instability, has the features such as technology novel, simple for structure (all-fiber).
The present invention is achieved through the following technical solutions:
A kind of fiber optic loop time lens combination for producing STUD pulse, uses single mode continuous light laser instrument as light
Source, is characterised by also including the first photoswitch, the logical filter of Arbitrary Waveform Generator, the second photoswitc, ytterbium doped optical fiber amplifier, band
Ripple device, the 3rd photoswitch, phase-modulator and grating pair；
Pulsed light direction along described single mode continuous light laser instrument output be successively described the first photoswitch, second
Photoswitch, described the second photoswitch, ytterbium doped optical fiber amplifier, band filter, the 3rd photoswitch and phase-modulation
Device is sequentially connected composition fiber optic loop, and the second outbound course at the 3rd described photoswitch is described grating pair；
The outfan of described Arbitrary Waveform Generator respectively with the first described photoswitch, the second photoswitch, the 3rd
Photoswitch is connected with the control end of phase-modulator, provides for its work and drives signal, and by exporting different signals, control
Make the duty of each device.
The spectral bandwidth of described single mode continuous light laser instrument is less than 100KHz, and Maximum Power Output is < 100mw.
Described ytterbium doped optical fiber amplifier is tunable amplifier, and amplification range is 0～25dB, and peak power output is
5W。
The centre wavelength of described band filter is 1053nm, and peak reflectivity is more than 99%, and three dB bandwidth is 12nm,
Sideband suppression ratio is more than 10dB.
The applicable wave band of described phase-modulator is 1053nm, half-wave voltage 2.7V, and three dB bandwidth is more than 10GHz, input
Output is protected partially.
The structural parameters of two sheet grations of described grating pair are consistent and are placed in parallel.
Present system includes three parts.
Part I, utilizes the copped wave performance of the first photoswitch, by the first photoswitch to single longitudinal mode continuous laser
Carry out copped wave, it is achieved the output of Gao Zhongying super Gaussian pulse.First photoswitch can also modulate the light pulse of arbitrary shape
Envelope.
Part II uses the time lens technologies of fiber optic loop innovatively, by the super-Gaussian arteries and veins to coupled into optical fibres ring
The use fiber amplifier washing circulation off carries out energy compensating, band filter carries out swashing beyond filter center wavelength 1053nm
Light and phase-modulator carry out suitable phase-modulation.After N circle modulation, the spectrum of pulsed light obtains enough broadenings, arteries and veins
Wash off and become chirped pulse optical, then by control the 3rd photoswitch, super Gaussian pulse is coupled out fiber optic loop.
Part III, creatively uses grating that compression exports pulse, and then produces with precipitous rising edge or decline
The ultrashort super Gaussian pulse of Gao Zhongying (STUD pulse) on edge.
The shape of pulse is to be produced by AWG (Arbitrary Waveform Generator), is formed through the first photoswitch copped wave, so light arteries and veins
The shape of punching and repetition rate are controlled.
Give the light pulse of input plus phase modulation function by the phase-modulator in fiber optic loop, input pulse is become
Chirped pulse.By controlling the number of times that light pulse circulates in fiber optic loop, control size and the width of pulse spectrum of pulse chirp
Degree.The most again by grating to providing contrary warbling to be compressed, it is achieved rising edge of a pulse or trailing edge, the control of pulse width
System.Owing to phase modulation function is controlled, the therefore above-mentioned controlled properties of pulse.
The second described photoswitch is by the pulsed light coupled into optical fibres ring through the first photoswitch copped wave output, along mixing ytterbium
Fiber amplifier, band filter, the 3rd photoswitch and phase-modulator circulation N circle, the spectrum of pulsed light obtains enough
After broadening, after described grating is to compression, export ultrashort super Gaussian pulse by the 3rd photoswitch coupling.
Any synthesis mode can be used, as special in Mach-once interferometer, Michelson's interferometer, Fabry Perot chamber
Deng.
Compared with prior art the invention has the beneficial effects as follows:
Utilize present system can produce STUD pulse, and its rising edge of a pulse or trailing edge, pulse width, repetition
Frequency, pulse shape are the most controlled.
Accompanying drawing explanation
Fig. 1 is that the present invention is for producing the light path schematic diagram of the embodiment 1 of the fiber optic loop time lens combination of STUD pulse.
Fig. 2 is pulse spectrum broadening schematic diagram.
Detailed description of the invention
Elaborating the present invention with embodiment below in conjunction with the accompanying drawings, the present embodiment is being front with technical solution of the present invention
Put and implement, give detailed embodiment and concrete operating process, but under protection scope of the present invention is not limited to
The embodiment stated.
Fig. 1 is that the present invention is for producing the light path schematic diagram of the embodiment 1 of the fiber optic loop time lens combination of STUD pulse.
As seen from the figure, the present invention, for producing the fiber optic loop time lens combination of STUD pulse, uses single mode continuous light laser instrument 1 conduct
Light source is after it constitutes the first photoswitch 2 also including arranging along the pulsed light direction of single mode continuous light laser instrument 1 output, logical
Cross the second photoswitch 4 to be coupled into by ytterbium doped optical fiber amplifier 5, band filter the 6, the 3rd photoswitch 7 and phase-modulator 8
The fiber optic loop constituted, the laser pulse after circulation is coupled out fiber optic loop by the 3rd photoswitch 7 again, then beats at grating 9
On；
The second described photoswitch is by the pulsed light coupled into optical fibres ring of output, along ytterbium doped optical fiber amplifier 5, wave filter
6, the 3rd photoswitch 7 and phase-modulator 8 circulate N circle (N is the integer of more than 1), and the spectrum of pulsed light obtains enough exhibitions
After width, it is coupled out fiber optic loop by the 3rd photoswitch 7；
The outfan of Arbitrary Waveform Generator 3 respectively with first described photoswitch the 2, second photoswitch the 4, the 3rd photoelectricity
Switch 7 is connected with phase-modulator 8.
The spectral bandwidth of single mode continuous light laser instrument 1 is less than 10KHz, and Maximum Power Output is 100mw.
Ytterbium doped optical fiber amplifier 5 is tunable amplifier, and amplification range is 0～25dB, and peak power output is 5W.
The centre wavelength of described band filter 6 is 1053nm, and peak reflectivity is more than 99%, and three dB bandwidth is 12nm,
Sideband suppression ratio is more than 10dB.
The applicable wave band of phase-modulator 8 is 1053nm, half-wave voltage 2.7V, and three dB bandwidth is more than 10GHz, input and output
Protect partially.
Single mode continuous light optical fiber laser 1 and the first photoswitch 2 connect.What single mode continuous light laser instrument produced swashs continuously
Light can be obtained by the super Gaussian pulse of nanosecond through the first photoswitch 2 copped wave.This super Gaussian pulse is through the second photoelectricity
Switch 4 is coupled into the light being made up of ytterbium doped optical fiber amplifier 5, band filter the 6, the 3rd photoswitch 7 and phase-modulator 8
Fine ring, through N > after 1 circle circulation, the spectrum of pulsed light obtains enough broadenings, is coupled out fiber optic loop by the 3rd photoswitch 7
Obtain chirped pulse optical.The output light finally obtaining enough energy goes to warble to 9 by grating, can be by rising edge or trailing edge
For 300ps, pulsewidth is that the super Gaussian pulse of 2ns is compressed to rising edge or trailing edge is 4.7ps, and pulsewidth is the precipitous super of 20ps
Short super Gaussian pulse.
Wherein: the first photoswitch 2 accept by AWG (Arbitrary Waveform Generator) (Arbitrary Waveform Generator,
Referred to as AWG) 3 Super-Gaussian Signals produced；Phase-modulator in fiber optic loop accepts the high frequency of the opposite in phase produced by AWG
Signal.
Described single mode continuous light laser instrument, spectral bandwidth is less than 100KHz, and Maximum Power Output is 100mw.
The insertion loss ＜ 3dB of described photoswitc, switching speed ＜ 100ps, half-wave voltage is 2.7V, high workload
Frequency is 10GHz.
Described ytterbium doped optical fiber amplifier, for tunable amplifier, amplification range is 0～25dB, and peak power output is
5W。
The centre wavelength of described band filter 6 is 1053nm, and peak reflectivity is more than 99%, and three dB bandwidth is 12nm,
Sideband suppression ratio is more than 10dB.
Described phase-modulator 8, applicable wave band is 1053nm, half-wave voltage 2.7V, and three dB bandwidth is more than 10GHz, input
Output is protected partially.
Described AWG sample rate is 12GS/s, carries a width of 10GHz, 2 tunnel separate analogue outputs, 4 tunnel independent digit outputs.
The STUD pulse that native system produces, suppresses parametric instability to play huge work in inertial confinement fusion
With.
Claims (6)
1., for producing a fiber optic loop time lens combination for STUD pulse, use single mode continuous light laser instrument (1) as light
Source, is characterised by also including that the first photoswitch (2), Arbitrary Waveform Generator (3), the second photoswitc (4), Yb dosed optical fiber amplify
Device (5), band filter (6), the 3rd photoswitch (7), phase-modulator (8) and grating are to (9)；
The pulse light direction successively exported along described single mode continuous light laser instrument (1) is the first described photoswitch successively
(2), the second photoswitch (4), described the second photoswitch (4), ytterbium doped optical fiber amplifier (5), band filter (6),
Three photoswitches (7) and phase-modulator (8) are sequentially connected composition fiber optic loop, at the second of the 3rd described photoswitch (7)
Outbound course is that described grating is to (9)；
The outfan of described Arbitrary Waveform Generator (3) respectively with described the first photoswitch (2), the second photoswitch (4),
3rd photoswitch (7) is connected with the control end of phase-modulator (8), provides for it and drives signal, and different by output
Signal, controls the duty of each device.
Fiber optic loop time lens combination for producing STUD pulse the most according to claim 1, it is characterised in that described
The spectral bandwidth of single mode continuous light laser instrument (1) less than 100KHz, Maximum Power Output is less than 100mw.
Fiber optic loop time lens combination for producing STUD pulse the most according to claim 1, it is characterised in that described
Ytterbium doped optical fiber amplifier (5) be tunable amplifier, amplification range is 0～25dB, and peak power output is 5W.
Fiber optic loop time lens combination for producing STUD pulse the most according to claim 1, it is characterised in that described
The centre wavelength of band filter (6) be 1053nm, peak reflectivity is more than 99%, and three dB bandwidth is 12nm, sideband suppression ratio
More than 10dB.
Fiber optic loop time lens combination for producing STUD pulse the most according to claim 1, it is characterised in that described
The applicable wave band of phase-modulator (8) be 1053nm, half-wave voltage 2.7V, three dB bandwidth is more than 10GHz, and input and output are protected partially.
6. according to the fiber optic loop time lens combination for producing STUD pulse described in any one of claim 1 to 5, its feature
Being that (9) are placed in parallel by described grating, the structural parameters of two sheet grations are consistent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610781421.1A CN106229797B (en) | 2016-08-31 | 2016-08-31 | For generating the fiber optic loop time lens system of ultrashort super Gaussian pulse |
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| CN201610781421.1A CN106229797B (en) | 2016-08-31 | 2016-08-31 | For generating the fiber optic loop time lens system of ultrashort super Gaussian pulse |
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| CN106229797A true CN106229797A (en) | 2016-12-14 |
| CN106229797B CN106229797B (en) | 2018-12-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109818237A (en) * | 2019-03-28 | 2019-05-28 | 上海交通大学 | Ultrashort laser pulse orthopedic systems based on fiber optic loop circular modulating time grating |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3124330B1 (en) * | 2021-06-22 | 2023-06-16 | Commissariat Energie Atomique | Time-shaping optical system and method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1392639A (en) * | 2001-06-14 | 2003-01-22 | 楼宪法 | Method for producing high-order mode-locking pulse in positive mode-locking erbium doping optical fibre circular laser |
| CN104158075A (en) * | 2014-08-05 | 2014-11-19 | 中国空间技术研究院 | Super Gaussian pulse generation method and device on basis of gain reshaping |
-
2016
- 2016-08-31 CN CN201610781421.1A patent/CN106229797B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1392639A (en) * | 2001-06-14 | 2003-01-22 | 楼宪法 | Method for producing high-order mode-locking pulse in positive mode-locking erbium doping optical fibre circular laser |
| CN104158075A (en) * | 2014-08-05 | 2014-11-19 | 中国空间技术研究院 | Super Gaussian pulse generation method and device on basis of gain reshaping |
Non-Patent Citations (2)
| Title |
|---|
| YUE LI等: "《Precise manipulation on spike train of uneven》", 《OPTICS EXPRESS》 * |
| ZHENG JUN等: "《Time-Grating for the Generation of STUD Pulse Trains 》", 《CHIN. PHYS. LETT.》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109818237A (en) * | 2019-03-28 | 2019-05-28 | 上海交通大学 | Ultrashort laser pulse orthopedic systems based on fiber optic loop circular modulating time grating |
| CN109818237B (en) * | 2019-03-28 | 2021-01-01 | 上海交通大学 | Ultrashort laser pulse shaping system based on optical fiber ring circulation modulation time grating |
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| Publication number | Publication date |
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| CN106229797B (en) | 2018-12-25 |
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