CN206193443U - Terahertz driven asia now flies a second time -resolved stripe camera - Google Patents
Terahertz driven asia now flies a second time -resolved stripe camera Download PDFInfo
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- CN206193443U CN206193443U CN201621155179.9U CN201621155179U CN206193443U CN 206193443 U CN206193443 U CN 206193443U CN 201621155179 U CN201621155179 U CN 201621155179U CN 206193443 U CN206193443 U CN 206193443U
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Abstract
The utility model discloses a belong to ultrafast diagnosis field, concretely relates to terahertz driven asia now flies a second time -resolved stripe camera. This camera includes femto second laser ware, beam splitter, ultraviolet ray pulse generator, electron gun, magnetic focusing device, deflection system, screen and EBCCD camera, a branch of femto second laser got into ultraviolet laser pulse generating device after the femto second laser of femto second laser ware outgoing passed through the beam splitter, and another bundle femto second laser gets into deflection system, the electron gun is used for turning into the ultraviolet ray pulse that ultraviolet ray pulse generator generated electronic pulse and accelerateing electronic pulse, install magnetic focusing device between electron gun and the deflection system, the EBCCD camera is just installed to the position of screen in main vacuum chamber outside. This stripe camera can be surveyed nonrelativisticly and the temporal characteristic ultrafast electronic pulse of relativistic, and resolution ratio can reach several magnitudes that fly second.
Description
Technical field
The utility model patent belongs to ultrafast diagnostic field, and in particular to the sub- femtosecond time resolution that a kind of Terahertz drives
Streak camera.
Background technology
The sign of the generation of ultrafast electronics, the manipulation of running orbit and its time response is current ultrafast research field
Key technology, and be typically closely related with ultrafast laser technique.
At present, ultrafast optical pulses can reach sub- the 100fs even magnitude of as, and corresponding ultrafast electronic impulse also may be used
To be compressed to hundreds of the fs even magnitude of several fs, but the measurement of the electronic impulse with this time precision is still faced with and is chosen
War.The rescattering of seed source, ultrafast electric diffraction and electronics especially in X-ray free-electron laser in atom etc. is real
In testing, the time response for fully understanding electronic impulse is the prerequisite of experiment test.Therefore, sub- femtosecond electronic impulse is realized
The measurement of time response is significant.Streak camera is to realize one of important tool that ultrafast electronic impulse is characterized, and it will
One-dimensional ultrafast temporal information is converted to spatial information, so that inverting measures the time response of ultrafast optical pulses.Currently used for ultrafast
The streak camera of electron beam time response measurement has：
Document【1】The streak camera for being related to a kind of time response for middle low-energy electron (about 30keV) pulse to measure, its
Temporal resolution is 150fs.Deflection system uses millimetre-sized small parallel deflecting plates, and spacing is only 0.5mm, and by arteries and veins
Rushing voltage excites GaAs photoconductive switch to provide deflection voltage.Due to the maximum of the pulse voltage that GaAs photoconductive switch can bear
Limited, the temporal resolution for further improving this streak camera is extremely difficult.Further, since it is operated in accumulation mode, when
Jitter has a major impact to its temporal resolution.
Document【2】It is related to one kind to can be used for the striped phase of middle energy or the measurement of high energy (keV or MeV) electron beam time response
Machine, its temporal resolution can reach sub- 100fs under single shot mode.It is right that the device is realized using radio-frequency cavity (rf cavity)
The deflection of high energy electron, but the phase jitter problem between radiofrequency field and electronic impulse limits the time point under accumulation mode
Resolution, generally higher than 100fs.Meanwhile, radio frequency deflection high-power electron beam is using high power RF, it is necessary to power supply costly
Drive system.
Therefore, in ultrafast electron beam time response representational field, in the urgent need to researching and developing, a kind of time resolution is higher, be applicable model
Enclose wider (being applied to nonrelativistic and relativistic electron), the streak camera that cost is lower and structure is simpler.
【1】A compact streak camera for 150fs time resolved measurement of
bright pulses in ultrafast electron diffraction.G.H.Kass ier,et
al.Rev.Sci.Instrum.81,105103(2010)；
【2】rf streak camera based ultrafast relativistic electron
diffraction.P.Musumeci,et al.Review of Scientific Instruments 80,013302
(2009)；
Utility model content
In order in solving the problems, such as background technology, the utility model provides one kind and can detect nonrelativistic and the theory of relativity
The time response of property (keV to MeV) ultrafast electronic impulse, resolution ratio up to several femtoseconds magnitude, while simple structure is too
Hertz drives the sub- femtosecond time resolution streak camera of electronic deflection.
Concrete technical scheme of the present utility model is：
The utility model provides the sub- femtosecond time resolution streak camera that a kind of Terahertz drives, including femtosecond laser
Device, beam splitter, ultraviolet light pulse generating means, electron gun, magnetic focusing arrangement, deflection system, fluorescent screen and camera；
The femtosecond laser of femto-second laser outgoing occurs by a branch of femtosecond laser after beam splitter into UV laser pulses
Device, another beam femtosecond laser enters deflection system；
Used in electron gun by the ultraviolet light pulse that ultraviolet light pulse generating means is generated in being converted into electronic impulse and to electronics
Pulse is accelerated；
Deflection system includes terahertz pulse generating means, main vacuum chamber, fluorescent screen, collimation orifice plate and two grades of days
Line；Main vacuum chamber front end opens up aperture, and fluorescent screen is installed in rear end；Main vacuum chamber from front to back successively install collimation orifice plate with
And two grades of antennas；The sidepiece of main vacuum chamber offers the first vacuum flange；The terahertz that terahertz pulse generating means will be produced
Hereby pulse passes sequentially through speculum, the first vacuum flange and sends and forms deflecting electric field into two grades of gaps of antenna；
Magnetic focusing arrangement is installed between electron gun and deflection system；
Position outside main vacuum chamber just to fluorescent screen is installed by EBCCD cameras.
When being used to characterize nonrelativistic electronics using the camera, the concrete structure of DC electron guns includes DC electron guns chamber
Room, the first lens, cathode assembly and anode；The front end mounted lens of DC electron gun chambers, rear end sets anode；DC electron guns
Chamber indoor location cathode assembly；Cathode assembly and anode generation accelerating field；The magnetic focusing arrangement is DC rifle magnetic focusing arrangements.
Upper cathode assembly includes cathode carrier, metallic cathode and cathode substrate；The metallic cathode is arranged on cathode substrate
On, cathode substrate is arranged in DC electron gun chambers by cathode anchor.
Particularly：The cathode substrate is sapphire or magnesium fluoride.
When being used to characterize relativistic ultrafast electronic impulse using the camera, electron gun is Rf electron guns；Rf electron gun bags
Include radio-frequency cavity and the photocathode on radio frequency cavity wall；The magnetic focusing arrangement is RF rifle magnetic focusing arrangements.
Specifically：Terahertz pulse generating means includes being set gradually along the direction along femto-second laser pulse outgoing
Grating, the second lens and lithium columbate crystal.
Specifically：The ultraviolet light pulse generating means includes being set gradually along the direction of femto-second laser pulse outgoing
Frequency-doubling crystal, group velocity compensation crystal, zeroth order double wave plates and frequency crystal and Amici prism；The frequency-doubling crystal is thickness
The I type-Ⅱphase matching bbo crystals of 0.2mm, 29.2 ° of cutting angle；Group velocity compensation crystal is thickness 0.2mm, 29.2 ° of cutting angle
I type-Ⅱphase matching bbo crystals；It is thickness 0.1mm, the I type-Ⅱphase matching bbo crystals of 44.3 ° of cutting angle with frequency crystal.
The length of above-mentioned two grades of antennas is 40 μm -80 μm, and a width of 10 μm -20 μm, gap is 5 μm -20 μm.
The utility model advantage is：
1st, the utility model using ultraviolet light pulse generating means, electron gun, magnetic focusing arrangement, deflection system, fluorescent screen,
The streak camera that EBCCD cameras and terahertz pulse generating means are formed can make beam energy reach the height of keV grades or MeV
Energy electron beam, is greatly improved the magnitude of the femto-second laser pulse of detection.
2nd, the two pole antennas that the Terahertz that the streak camera that the utility model is provided is used drives are used as deflection system, deflection
System architecture is simple, only changes the geometry of two pole antennas, and resonant frequency can just become in the range of 100GHz to several THz
Change, so that the rise time of produced deflecting electric field can change in the range of hundreds of femtoseconds to several psecs, the streak camera can
Nonrelativistic and relativistic (keV and MeV) the ultrafast electron beam of detection, can be characterized under single shot mode ultrafast electron beam when
Between characteristic, and terahertz pulse and electron beam have more preferable synchronism, and temporal resolution can reach a few femtosecond magnitudes.
Brief description of the drawings
Fig. 1 is the sub- femtosecond time resolution streak camera structural representation driven using DC electron guns Terahertz；
Fig. 2 is terahertz pulse generation device structural representation；
Fig. 3 is the sub- femtosecond time resolution streak camera structural representation driven using RF electron guns Terahertz；
Fig. 4 is ultraviolet light pulse generating means structural representation.
Reference is as follows：
1st, femto-second laser pulse；2nd, terahertz pulse；3rd, ultraviolet light pulse；4th, the first lens；5th, DC electron guns chamber；6、
Cathode anchor；7th, cathode substrate；8th, metallic cathode；9th, anode；10th, DC rifles magnetic focusing arrangement；11st, vacuum pipe；12nd, main vacuum
Chamber；13rd, collimating aperture；14th, two grades of antennas；15th, the first vacuum flange；16th, fluorescent screen；17th, EBCCD cameras；18th, speculum；
19th, the second vacuum flange；20th, laser chamber；21st, photocathode；22nd, radio-frequency cavity；23rd, RF rifles magnetic focusing arrangement；24th, ultrashort electricity
Subpulse；25th, grating；26th, the second lens；27th, lithium columbate crystal；28th, frequency-doubling crystal；29th, group velocity compensation crystal；30th, zero
Rank double wave plates；31 and frequency crystal, 32, femto-second laser；33rd, beam splitter, 34- UV laser pulses generating means, 35- deflections
System, 36- terahertz pulses generating means, 37- speculums, 38- Amici prisms.
Specific embodiment
The utility model is described in detail using the embodiment of two kinds of electron guns below in conjunction with the accompanying drawings.
Embodiment 1：
As depicted in figs. 1 and 2, the streak camera includes femto-second laser 32, beam splitter 33, ultraviolet light pulse generating means
34th, DC electron guns, DC rifles magnetic focusing arrangement 10, deflection system 35, fluorescent screen 16 and EBCCD cameras 17；
The femtosecond laser (a) of the outgoing of femto-second laser 32 enters Ultra-Violet Laser arteries and veins by a branch of femtosecond laser after beam splitter 33
Generating means 34 is rushed, another beam femtosecond laser (b) enters deflection system 35；
DC electron guns include DC electron guns chamber 5, the first lens 4, cathode assembly and anode 9；DC electron guns chamber 5
The first lens 4 are installed in front end, and rear end sets anode 9；Cathode assembly is installed in DC electron guns chamber 5；Cathode assembly and anode 9 are given birth to
Into accelerating field；Cathode assembly includes cathode carrier 6, metallic cathode 8 and cathode substrate 7；Metallic cathode 8 is arranged on cathode substrate
On 7, cathode substrate 7 is arranged in DC electron guns chamber 5 by cathode anchor 6.
Deflection system 35 includes terahertz pulse generating means 36, speculum 37, main vacuum chamber 12, fluorescent screen 16, standard
Straight hole plate 13 and two grades of antennas 14；The front end of main vacuum chamber 12 opens up aperture, and fluorescent screen 16 is installed in rear end；Main vacuum chamber 12
Collimation orifice plate 13 and two grades of antennas 14 are installed successively from front to back；The sidepiece of main vacuum chamber 12 offers the first vacuum flange
15；Terahertz pulse generating means by the terahertz pulse 2 of generation pass sequentially through speculum 37, the first vacuum flange 15 send to
Deflecting electric field is formed in two grades of gaps of antenna 14；
DC rifles magnetic focusing arrangement 10 is installed between DC electron guns chamber 5 and main vacuum chamber 12；
Position outside main vacuum chamber 12 just to fluorescent screen 16 is installed by EBCCD cameras 17.
A branch of femto-second laser pulse (a) produces ultraviolet light pulse 3, ultraviolet light pulse 3 through ultraviolet light pulse generating means 34
It is irradiated on the metallic cathode 8 in DC electron gun chambers through lens focus, produces external photoeffect, launches ultrafast electronic impulse
24, this process is regarded as moment completion, time explanation and spatial distribution and the incident uv arteries and veins of ultrafast electronic impulse 24
Rush 3 identical.
Ultrafast electronic impulse 24 is added in DC electron guns chamber 5 by the accelerating field between its anode 9 and metallic cathode 8
Speed, then focused on by DC rifles magnetic focusing arrangement 10, the gap of two pole antennas 14 is entered by collimating orifice plate 13；
While ultrafast electronic impulse 24 is produced, another beam femto-second laser pulse (b) produces oblique laser through grating 25
Pulse, and converge to lithium niobate (LiNbO through lens 263) crystal 27, there is optical rectification effect, terahertz pulse 2 is produced, this
When two pole antennas 14 by terahertz pulse 2 excite generation time-varying deflecting electric field, ultrafast electronic impulse 24 is in time-varying deflecting electric field
In the presence of, the electronics with different longitudinal position (not entering two pole antenna gaps in the same time), by different deflection electricity
, so as to be deflected by the diverse location of fluorescent screen 16, the striped picture of spatial deflection scanning is formed, and read by EBCCD cameras 17
Take, the mapping of light signal temporal information to spatial information is treated in realization.
Embodiment 2：
The utility model can be not only used for characterizing the nonrelativistic electronics accelerated by DC rifles, can also be to relativistic
The time response of ultrafast electronic impulse is characterized, and specific embodiment is that the acceleration to electron beam is realized using RF electron guns.
Fig. 3 show the structural representation of RF electron guns,
A branch of femto-second laser pulse (a) produces ultraviolet light pulse through ultraviolet light pulse generating means, and ultraviolet light pulse is by purple
Outer laser pulse introduces laser cavity by the second vacuum flange 19 (the second vacuum flange is distributed on laser exterior thereto, totally four)
Room；Ultraviolet light pulse 3 is outer through in the reflected illumination of 20 internal reflector of laser chamber 18 to the photocathode 21 in rf tank 22, occurring
Photoelectric effect, resulting from light pulse has the ultrafast electronic impulse 24 of same spatio-temporal distribution, and ultrafast electronic impulse 24 is passed through
Radio-frequency cavity accelerates, and energy reaches MeV, then is focused on by RF rifles magnetic focusing arrangement 23, and two pole antennas are entered by collimating orifice plate 13
14 gap；
While ultrafast electronic impulse 24 is produced, another beam femto-second laser pulse (b) produces oblique laser through grating 25
Pulse, and converge to lithium niobate (LiNbO through lens 263) crystal 27, there is optical rectification effect, terahertz pulse 2 is produced, this
When two pole antennas 14 by terahertz pulse 2 excite generation time-varying deflecting electric field, ultrafast electronic impulse 24 is in time-varying deflecting electric field
In the presence of, the electronics with different longitudinal position (not entering two pole antenna gaps in the same time), by different deflection electricity
, so as to be deflected by the diverse location of fluorescent screen 16, the striped picture of spatial deflection scanning is formed, and read by EBCCD cameras 17
Take, the mapping of light signal temporal information to spatial information is treated in realization.
It should be noted that：The structure of the ultraviolet light pulse generating means 34 in above-mentioned two embodiment is as shown in figure 4, tool
Body includes frequency-doubling crystal 28, the group velocity compensation crystal 29, the zeroth order double wave plates that are set gradually along the direction of femtosecond laser outgoing
30 and frequency crystal 31 and Amici prism 38；Ultraviolet light pulse generating means is included along the direction of femto-second laser pulse outgoing
Frequency-doubling crystal, group velocity compensation crystal, zeroth order double wave plates and frequency crystal and the Amici prism for setting gradually；The frequency-doubling crystal
It is thickness 0.2mm, the I type-Ⅱphase matching bbo crystals of 29.2 ° of cutting angle；Group velocity compensation crystal is thickness 0.2mm, cutting angle
29.2 ° of I type-Ⅱphase matching bbo crystals；It is thickness 0.1mm with frequency crystal, the I type-Ⅱphase matchings BBO of 44.3 ° of cutting angle is brilliant
Body.
Claims (8)
1. the sub- femtosecond time resolution streak camera that a kind of Terahertz drives, it is characterised in that：Including femto-second laser, beam splitting
Mirror, ultraviolet light pulse generating means, electron gun, magnetic focusing arrangement, deflection system, fluorescent screen and EBCCD cameras；
The femtosecond laser of femto-second laser outgoing enters UV laser pulses generating means by a branch of femtosecond laser after beam splitter,
Another beam femtosecond laser enters deflection system；
Used in electron gun by the ultraviolet light pulse that ultraviolet light pulse generating means is generated in being converted into electronic impulse and to electronic impulse
Accelerated；
Deflection system includes terahertz pulse generating means, speculum, main vacuum chamber, fluorescent screen, collimation orifice plate and two grades
Antenna；Main vacuum chamber front end opens up aperture, and fluorescent screen is installed in rear end；Main vacuum chamber installs collimation orifice plate successively from front to back
And two grades of antennas；The sidepiece of main vacuum chamber offers the first vacuum flange；Terahertz pulse generating means will be produced too
Hertz pulse passes sequentially through speculum, the first vacuum flange and sends and forms deflecting electric field into two grades of gaps of antenna；
Magnetic focusing arrangement is installed between electron gun and deflection system；
Position outside main vacuum chamber just to fluorescent screen is installed by EBCCD cameras.
2. the sub- femtosecond time resolution streak camera that Terahertz according to claim 1 drives, it is characterised in that：The electricity
Sub- rifle is DC electron guns；DC electron guns include DC electron guns chamber, the first lens, cathode assembly and anode；DC electron guns chamber
The front end mounted lens of room, rear end sets anode；DC electron guns chamber indoor location cathode assembly；Cathode assembly and anode generation add
Fast electric field；The magnetic focusing arrangement is DC rifle magnetic focusing arrangements.
3. the sub- femtosecond time resolution streak camera that Terahertz according to claim 2 drives, it is characterised in that：Described the moon
Pole component includes cathode carrier, metallic cathode and cathode substrate；The metallic cathode is arranged in cathode substrate, and cathode substrate is led to
Cathode anchor is crossed to be arranged in DC electron gun chambers.
4. the sub- femtosecond time resolution streak camera that Terahertz according to claim 3 drives, it is characterised in that：Described the moon
Pole substrate is sapphire or magnesium fluoride.
5. the sub- femtosecond time resolution streak camera that Terahertz according to claim 1 drives, it is characterised in that：The electricity
Sub- rifle is Rf electron guns；Rf electron guns include radio-frequency cavity and the photocathode on radio frequency cavity wall；The magnetic focusing
Device is RF rifle magnetic focusing arrangements.
6. the sub- femtosecond time resolution streak camera that the Terahertz according to claim 2 or 5 drives, it is characterised in that：Institute
State grating, the second lens that terahertz pulse generating means includes setting gradually along the direction of laser pulse outgoing to be detected with
And lithium columbate crystal.
7. the sub- femtosecond time resolution streak camera that Terahertz according to claim 6 drives, it is characterised in that：The purple
Outer optical pulse generator includes the frequency-doubling crystal, the group velocity compensation crystalline substance that are set gradually along the direction of femto-second laser pulse outgoing
Body, zeroth order double wave plates and frequency crystal and Amici prism；The frequency-doubling crystal is thickness 0.2mm, the I class phases of 29.2 ° of cutting angle
Position matching bbo crystal；Group velocity compensation crystal is thickness 0.2mm, the I type-Ⅱphase matching bbo crystals of 29.2 ° of cutting angle；And frequency
Crystal is thickness 0.1mm, the I type-Ⅱphase matching bbo crystals of 44.3 ° of cutting angle.
8. the sub- femtosecond time resolution streak camera that Terahertz according to claim 7 drives, it is characterised in that：Described two
The length of level antenna is 40 μm -80 μm, and a width of 10 μm -20 μm, gap is 5 μm -20 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621155179.9U CN206193443U (en) | 2016-10-31 | 2016-10-31 | Terahertz driven asia now flies a second time -resolved stripe camera |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621155179.9U CN206193443U (en) | 2016-10-31 | 2016-10-31 | Terahertz driven asia now flies a second time -resolved stripe camera |
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| Publication Number | Publication Date |
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| CN206193443U true CN206193443U (en) | 2017-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621155179.9U Withdrawn - After Issue CN206193443U (en) | 2016-10-31 | 2016-10-31 | Terahertz driven asia now flies a second time -resolved stripe camera |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106444346A (en) * | 2016-10-31 | 2017-02-22 | 中国科学院西安光学精密机械研究所 | Terahertz-driven sub-femtosecond time-resolved streak camera |
| CN113686312A (en) * | 2021-08-27 | 2021-11-23 | 中国科学院西安光学精密机械研究所 | Ultra-high-speed continuous sampling stripe camera imaging method and system |
-
2016
- 2016-10-31 CN CN201621155179.9U patent/CN206193443U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106444346A (en) * | 2016-10-31 | 2017-02-22 | 中国科学院西安光学精密机械研究所 | Terahertz-driven sub-femtosecond time-resolved streak camera |
| CN106444346B (en) * | 2016-10-31 | 2018-12-14 | 中国科学院西安光学精密机械研究所 | A kind of sub- femtosecond time resolution streak camera of Terahertz driving |
| CN113686312A (en) * | 2021-08-27 | 2021-11-23 | 中国科学院西安光学精密机械研究所 | Ultra-high-speed continuous sampling stripe camera imaging method and system |
| CN113686312B (en) * | 2021-08-27 | 2022-10-04 | 中国科学院西安光学精密机械研究所 | Ultra-high-speed continuous sampling stripe camera imaging method |
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