CN104317154A - Ultrafast continuous imaging device and method - Google Patents
Ultrafast continuous imaging device and method Download PDFInfo
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- CN104317154A CN104317154A CN201410669382.7A CN201410669382A CN104317154A CN 104317154 A CN104317154 A CN 104317154A CN 201410669382 A CN201410669382 A CN 201410669382A CN 104317154 A CN104317154 A CN 104317154A
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Abstract
The invention relates to an ultrafast continuous imaging device and method, and belongs to the technical field of ultrafast imaging. The device comprises an ultrafast laser, a first beam expanding lens, a second beam expanding lens, a delayer, a focusing lens, an observation object, a disperse lens and a camera array. According to the method, the ultrafast laser is used for generating femtosecond-order ultrashort pulses, step type lenses with different thicknesses are used for achieving a femtosecond-order delay pulse sequence, different sub-pulses pass the same detecting point through a focusing-dispersing method, and it can be guaranteed that an imaging light beam can be horizontally ejected; imaging is carried out through the camera array at different times. The ultrafast continuous imaging device and method can break through the bottleneck of time resolving power, and the time resolving power is improved to the femtosecond order. For the process with no repeated experiment condition, continuous imaging can be achieved at a time during an experiment. A control circuit is not needed, and cost is reduced. The structure is relatively simple and easy to achieve.
Description
Technical field
The present invention relates to a kind of ultrafast continuous imaging device and method, belong to ultrafast imaging field.
Background technology
In the process of scientific research and technical research, the ultrafast process to some occurs in very short time is often needed to study, the energy trasfer such as, produced in femtosecond laser process, electron excitation, the processes such as plasma evolution all occur in femtosecond to picosecond magnitude, the duration of these processes is very short, but the ultrafast change occurred in this time scale but directly affects and determines quality and the precision of following process result, the ultrafast process observed in this time scale is conducive to the interaction mechanism disclosing femtosecond laser and material, thus in the urgent need to a kind of continuous imaging apparatus and method with Superfast time resolution ability.
Traditional high-speed and continuous imaging device is plant equipment due to what adopt, and its time resolution can only reach the level of microsecond, and operating process more complicated, be eliminated gradually at present.Based on the frame imaging device of ultrafast electronic shutter, its time resolution depends on the response speed of control circuit, can reach the resolution characteristic of nanosecond, but is difficult to continue to improve again.Further, because the cost of ultrafast electronic control system is higher, therefore the price of this kind of frame imaging device is very expensive.
The imaging technique of traditional femtosecond magnitude, cannot realize continuous shooting.Traditional pump probe technology is a kind of Detection Techniques with femtosecond magnitude time sense, in pump probe experiment, in order to the whole change procedure of complete documentation detected object, general by repeatedly repeating experiment, choose different moment to take at every turn, finally according to time sequencing by above-mentioned repeatedly repeat to test in a series of photos of shooting piece together and reduce the dynamic consecutive variations process of detected object.Can not accomplish to repeat completely owing to testing at every turn, in this way there is error, and for not possessing the process of duplicating experimental condition, then cannot carry out Continuous Observation.
Therefore, current in the urgent need to a kind of can either breakthrough time resolution characteristic bottleneck and the ultrafast continuous imaging technology of one of continuous imaging can be realized again.
Summary of the invention
The object of the invention is to solve existing imaging means temporal resolution low, ultrafast imaging cannot be carried out to being spaced apart the process of femtosecond to picosecond magnitude, being difficult to the problem meeting research and production needs, and proposing a kind of ultrafast continuous imaging device and method.
The object of the invention is to be achieved through the following technical solutions.
A kind of ultrafast continuous imaging device, comprises, ultrafast laser, the first extender lens, the second extender lens, chronotron, condenser lens, the object of observation, discrete lens, camera array.
Its light path trend is: ultrafast laser produces ultrashort pulsed beam; Light beam is after the first extender lens and the second beam lens, and hot spot amplifies and level injection; Light beam covers whole chronotron, produces the subpulse that time delay is different; Through the object of observation after subpulse is focused on by condenser lens, by beam collimation after discrete lens, in camera array imaging.
Described chronotron is spatial aliasing type chronotron.
A kind of ultrafast continuous imaging method, performing step is as follows:
1) first ultrashort laser pulse is produced by ultrafast laser; Use the different lens on light beam radius of focal length to expand, make light beam can cover chronotron completely;
2) the incident chronotron surface of laser vertical.Light beam is divided into multiple light beam by chronotron, and makes each light beam produce different time delays (time delay is femtosecond magnitude).Light beam exports from chronotron abreast;
3) light beam is parallel incides condenser lens, and multiple light beam focuses on detected object place, and multiple light beam has the time delay of femtosecond magnitude by the time of detected object.Laser light detected object, because it is to the difference of laser absorption rate, laser carries the information of detected object.After detected object difference, discrete lens are utilized to make multiple light beam separately and export abreast;
4) multiple light beam outputs to camera array place, and different light beam collects not image in the same time, detects the continuous print image-forming information of femtosecond magnitude;
5) object of observation is removed, gather bias light, with step 4) image comparison, remove background process, can final image be obtained.
Light beam sequence focuses on by described condenser lens, and discrete lens by light beam series of discrete separately, thus are convenient to follow-up imaging.
Beneficial effect
Advantage of the present invention comprises:
1, the bottleneck of energy breakthrough time resolution characteristic, makes time resolution bring up to femtosecond magnitude;
2, for the process not possessing duplicating experimental condition, single experiment continuous imaging is realized;
3, do not need to use control circuit, reduce cost;
4, structure is relatively simple, is easy to realize.
Accompanying drawing explanation
Fig. 1 is the structural representation of an embodiment of patent of the present invention;
Fig. 2 is the schematic three dimensional views of the chronotron 4 of one embodiment of the invention;
Wherein, 1-ultrafast laser, 2-first extender lens, 3-second extender lens, 4-chronotron, 5-condenser lens, the 6-object of observation, the discrete lens of 7-, 8-camera array.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described further.
Embodiment
As shown in Figure 1, a kind of ultrafast continuous imaging device, comprises, ultrafast laser 1, first extender lens 2, second extender lens 3, chronotron 4, condenser lens 5, the object of observation 6, discrete lens 7, camera array 8.
Its light path trend is: ultrafast laser 1 produces ultrashort pulsed beam; Light beam is after the first extender lens 2 and the second beam lens 3, and hot spot amplifies and level injection; Light beam covers whole chronotron 4, produces the subpulse that time delay is different; By the object of observation 6 after subpulse is focused on by condenser lens 5, utilize the rear beam collimation of discrete lens 7, in camera array 8 imaging.
A kind of ultrafast continuous imaging method, performing step is as follows:
1) first ultrafast laser 1 is produced ultrashort laser pulse, the energy of strict gating pulse, prevent pulse energy too large, interference is caused to result of detection; Use the lens that two focal lengths are different, both the first extender lens 2, second extender lens 3 pairs of beam radius expanded, and made light beam can cover chronotron 4 completely;
2) incident chronotron 4 surface of laser vertical, light beam is divided into multiple light beam by chronotron, and makes each light beam produce different time delays (time delay of femtosecond magnitude).Light beam exports from chronotron 4 abreast.
In embodiment 1, as shown in Figure 2, chronotron is made up of the fused quartz of different-thickness.The working face of whole chronotron is divided into 9 parts, and thickness increases successively according to order from left to right, from top to bottom, thus, also different through the time delays of every part, and this is determined by the thickness difference of quartz glass.Such as, use the femto-second laser pulse that centre wavelength is 800nm, the time delays caused when thickness difference is d is:
N in formula
c, n
sbe the refractive index of vacuum, quartz respectively, c is the light velocity in vacuum.Can calculate according to Sellmier experimental formula, the refractive index n of laser in quartz glass of 800nm
sbe 1.4533.Refractive index n in vacuum
cbe 1.Calculate when thickness difference is 1 μm accordingly, time delay is 10.69fs.Known successively, the method can realize the time delay of fs magnitude.
3), after the light beam that multi beam time delay is different incides condenser lens 5 abreast, detected object 6 place is focused onto.Every beam of laser is when the heating region through detected object 6 place, because plasma is to the absorption of laser and reflection, laser can be made to carry the information of this regional Electronic Density Distribution, because every beam of laser is different by moment of heating region, thus this multiple light beam can the instantaneous plasma density distribution information of the multiple difference in this region of continuous acquisition.After detected object 6, discrete lens 7 are utilized to make multiple light beam separately and export abreast.
4) multiple light beam outputs to camera array 8 place, and the not plasma density convert information in the same time carried in multiple beamlet is become pattern matrix by camera array 8.
5) object of observation 6 is removed, repeats step 1) to 4), collect background image.To step 4) signal pattern carry out removal background process, the continuous print plasma density Evolution maps information of the femtosecond magnitude at detected object 6 place can be obtained.
The time sense of said apparatus and method can reach femtosecond magnitude, far exceedes traditional continuous imaging equipment.In addition for the imaging technique of traditional femtosecond magnitude, it can realize single experiment just can generate several continuous pictures, and device is simple and method is feasible.
Claims (4)
1. a ultrafast continuous imaging device, it is characterized in that: comprise, ultrafast laser (1), the first extender lens (2), the second extender lens (3), chronotron (4), condenser lens (5), the object of observation (6), discrete lens (7), camera array (8);
Its light path trend is: ultrafast laser (1) produces ultrashort pulsed beam; Light beam is after the first extender lens (2) and the second beam lens (3), and hot spot amplifies and level injection; Light beam covers whole chronotron (4), produces the subpulse that time delay is different; By the object of observation (6) carry information after subpulse is focused on by condenser lens (5), by discrete lens (7) beam collimation afterwards, in camera array (8) imaging.
2. a kind of ultrafast continuous imaging device as claimed in claim 1, is characterized in that: described chronotron comprises spatial aliasing type chronotron.
3. a ultrafast continuous imaging method, it is characterized in that, performing step is as follows:
1) first ultrashort laser pulse is produced by ultrafast laser; Use the different lens on light beam radius of focal length to expand, make light beam can cover chronotron completely;
2) the incident chronotron surface of laser vertical, light beam is divided into multiple light beam by chronotron, and makes each light beam produce different time delays, and light beam exports from chronotron abreast;
3) light beam is parallel incides condenser lens, and multiple light beam focuses on detected object place, and multiple light beam has the time delay of femtosecond magnitude by the time of detected object, and thus laser carries detected object not information in the same time; After detected object, discrete lens are utilized to make multiple light beam separately and export abreast;
4) multiple light beam outputs to camera array place, and different light beam collects not image in the same time, detects the continuous print image-forming information of femtosecond magnitude;
5) object of observation is removed, gather bias light, with step 4) image comparison, by remove background process, can final image be obtained.
4. a kind of ultrafast continuous imaging method as claimed in claim 3, is characterized in that: light beam sequence focuses on by condenser lens, and discrete lens by light beam series of discrete separately, thus are convenient to follow-up imaging.
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| CN106450750A (en) * | 2016-12-07 | 2017-02-22 | 中国科学院福建物质结构研究所 | Terahertz photoconductive phased-array antenna system |
| CN108426861A (en) * | 2018-03-09 | 2018-08-21 | 苏州大学 | The method that ultrashort one pulse time differentiates pump probe is realized using ladder window |
| CN109443997A (en) * | 2018-12-20 | 2019-03-08 | 常州大学 | Pipeline Leak diffusion experiment platform based on photoacoustic tomography method |
| CN109799196A (en) * | 2019-03-05 | 2019-05-24 | 北京理工大学 | Multifrequency pulse sequence ultrafast laser continuous spectrum detection device and method |
| CN109799235A (en) * | 2019-03-12 | 2019-05-24 | 中国工程物理研究院激光聚变研究中心 | Imaging device and imaging method |
| CN109799671A (en) * | 2019-03-05 | 2019-05-24 | 北京理工大学 | Multifrequency pulse ultrafast laser continuous imaging device and method based on super continuous spectrums |
| CN112902866A (en) * | 2021-01-18 | 2021-06-04 | 武汉大学 | Spatial framing device, all-optical ultrafast imaging system and method |
| WO2021143814A1 (en) * | 2020-01-16 | 2021-07-22 | 安徽省东超科技有限公司 | Three-dimensional aerial imaging device based on light beam intersection and air ionization |
| CN118169957A (en) * | 2024-05-13 | 2024-06-11 | 中国工程物理研究院激光聚变研究中心 | Ultrafast sampling imaging system for visible light framing camera |
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| CN108426861A (en) * | 2018-03-09 | 2018-08-21 | 苏州大学 | The method that ultrashort one pulse time differentiates pump probe is realized using ladder window |
| CN109443997A (en) * | 2018-12-20 | 2019-03-08 | 常州大学 | Pipeline Leak diffusion experiment platform based on photoacoustic tomography method |
| CN109443997B (en) * | 2018-12-20 | 2021-03-23 | 常州大学 | Oil pipeline leakage diffusion experiment platform based on photoacoustic tomography |
| CN109799196A (en) * | 2019-03-05 | 2019-05-24 | 北京理工大学 | Multifrequency pulse sequence ultrafast laser continuous spectrum detection device and method |
| CN109799671A (en) * | 2019-03-05 | 2019-05-24 | 北京理工大学 | Multifrequency pulse ultrafast laser continuous imaging device and method based on super continuous spectrums |
| CN109799235A (en) * | 2019-03-12 | 2019-05-24 | 中国工程物理研究院激光聚变研究中心 | Imaging device and imaging method |
| WO2021143814A1 (en) * | 2020-01-16 | 2021-07-22 | 安徽省东超科技有限公司 | Three-dimensional aerial imaging device based on light beam intersection and air ionization |
| CN112902866A (en) * | 2021-01-18 | 2021-06-04 | 武汉大学 | Spatial framing device, all-optical ultrafast imaging system and method |
| CN112902866B (en) * | 2021-01-18 | 2021-12-03 | 武汉大学 | Spatial framing device, all-optical ultrafast imaging system and method |
| CN118169957A (en) * | 2024-05-13 | 2024-06-11 | 中国工程物理研究院激光聚变研究中心 | Ultrafast sampling imaging system for visible light framing camera |
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Application publication date: 20150128 |