CN2599616Y - Off-axis double-waveband plate atomic beam image surface holographic recording device - Google Patents
Off-axis double-waveband plate atomic beam image surface holographic recording device Download PDFInfo
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- CN2599616Y CN2599616Y CNU032285884U CN03228588U CN2599616Y CN 2599616 Y CN2599616 Y CN 2599616Y CN U032285884 U CNU032285884 U CN U032285884U CN 03228588 U CN03228588 U CN 03228588U CN 2599616 Y CN2599616 Y CN 2599616Y
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- 238000012360 testing method Methods 0.000 claims description 17
- 238000003384 imaging method Methods 0.000 claims description 15
- 238000005266 casting Methods 0.000 claims description 8
- 230000005672 electromagnetic field Effects 0.000 abstract description 5
- 230000005484 gravity Effects 0.000 abstract description 5
- 230000008859 change Effects 0.000 abstract description 4
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 13
- 238000001093 holography Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000003321 amplification Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
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- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
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- 230000005540 biological transmission Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
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Abstract
An off-axis dual-waveband plate atomic beam image surface holographic recording device is suitable for measuring physical quantities which can cause phase change of atomic beams, such as a gravity field, an electromagnetic field and the like. The device includes: the atomic beam source is arranged in the vacuum shell, the first microwave band sheet and the second microwave band sheet are arranged in parallel in the advancing direction of the atomic beam current emitted from the atomic beam source, a sample to be detected is placed in the atomic beam current between the first microwave band sheet and the atomic beam source, an interference signal is generated on a microchannel plate arranged on an image surface of the microwave band sheet through the sample to be detected and an object beam of the first microwave band sheet and a reference beam of the second microwave band sheet, charges are generated by the microchannel plate, and digital reconstruction is carried out from a detector to a computer. Compared with the prior art, the utility model discloses have small, high sensitivity, high resolution and better image quality.
Description
Technical field:
The utility model is from axle double wave strap holographic image plane recorder with atomic beams about a kind of, be particularly related to a kind of device that utilizes double wave strap record atom holography figure, be mainly used in and measure the physical quantity that gravity field, electromagnetic field etc. can cause the atomic beam phase change.
Background technology:
Atom optics has become a new subject, and the reflection of atomic beam, focusing, imaging, diffraction and interference are succeedd in many laboratories.As everyone knows, holography is a kind of two step imaging processes, and the first step is a record, promptly with the form of interference fringe, the object corrugated is noted.Second step was reconstruct, both can carry out optics and reappear with former recording light or visible light, also can carry out digital reconstruction with computing machine.In the digital reconstruction process, can pass through some special algorithm, the various aberrations of introducing in the recording process are eliminated.1996, Mokoto, people such as Morinaga are (referring to technology [] formerly: Jun-ichi Fujitaand Shinji Matsui, Holographic Manipulation of a Cold Atomic Beam, Physical Review Letters, Vol.77, No.5,29, July, 1996.) finished an experiment, they with computer manufacture a two-dimensional hologram, throw light on it with metastable state Ne atom then, reappear, obtained reconstructed image.Certainly, in essence, this also cannot say for sure it is the atom hologram device, has only used atomic beam to reappear hologram.Yet this is up to now, and preliminary attempt of people on the atom hologram art demonstrates some distinctive advantage of atom hologram art, evoked people and studied interest greatly.Use for reference the method for optical holography,, its principle is applied in the atom optics as the laser image plane holography.
Laser image plane holography pen recorder, be widely used in the optical holography field (referring to technology [2] optical technology handbook formerly,＜on, China Machine Press, Beijing in August, 1994, P317), it is to pass through imaging system, the image position that makes testing sample on the holographic plate or near, the reference light oblique incidence, Ji Lu hologram is image plane holographic figure like this.Laser image plane holography device as shown in Figure 1, mainly by LASER Light Source 1, beam splitter 2, catoptron 3,6,8, tested article 4, imaging len 5 and recording medium 7 formed.LASER Light Source 1 is divided into two-beam through beam splitter 2, and a branch of light is thing light Wb, and on recording medium 7, reference light Cb and thing light Wb meet on recording medium 7 through 5 one-tenth real images of imaging len for another Shu Guangwei reference light Cb, tested article 4, forms interference fringe.
The shortcoming that this laser image plane holography pen recorder exists:
The lighting source that laser image plane holography pen recorder is adopted is a visible light wave range, and wavelength is longer, because the size of resolution and the wavelength relation of being inversely proportional to, therefore, the resolution of laser image plane holography pen recorder, more much lower than the holography of atomic beam illumination.And at some special occasions, laser image plane holography pen recorder is helpless, as to measurement of gravity field, electromagnetic field etc.
The atomic beam interferometer that the inventor Gao Hongyi of Shanghai Optics and Precision Mechanics institute, Chinese Academy of Sciences, Chen Jianwen, Xie Honglan, Xu are provided to exhibition (see technology [3] formerly: atomic beam interferometer, application number 0131305417), device as shown in Figure 2.It comprises: in the vacuum chamber 14 that is made of shell 15, be equipped with atomic beam source 9, zone plate 10, place the pinhole diaphragm 13 at zone plate 10 focus places, and export the receiver 12 that is connected on the computing machine 16, article 11 to be measured are placed on the focal plane on pinhole diaphragm 13 next doors.
The near parallel atomic beam of the atomic beam source 9 emission zone plate 10 that throws light on, place the pinhole diaphragm 13 of a small size (diameter is 0.1mm) at zone plate 10 first-order diffraction focus O places, restraint Gc from the atomic beam that pinhole diaphragm 13 transmits as reference, and come, do not pass through collimated beam (the zero order wave P of testing sample 11 from zone plate 10 transmissions
0) as thing bundle Gw, place thing bundle Gw and pinhole diaphragm 13 on same horizontal level article 11 to be measured, at two atomic beam Gc and the Gw place that meets, can obtain interference fringe.The interference fringe spacing depends on reference to the angle between bundle Gc and object distance Gw, and the de Broglie wavelength of atom.Interference information is received device 12 and receives, and is transferred on the computing machine 16, and computing machine interferes hologram to be reconstructed reproduction to it again.
The weak point of this intervening atom sheet is, and is high to the spatial coherence requirement of atomic beam source.
Summary of the invention:
The problem of technology to be solved in the utility model is the shortcoming that exists in the above-mentioned technology formerly for overcoming, and provides a kind of from axle double wave strap holographic image plane recorder with atomic beams.The utility model can be measured any physical quantitys that can cause the atomic beam phase change such as electromagnetic field, gravity field.
Technical solution of the present utility model is:
A kind of from axle double wave strap holographic image plane recorder with atomic beams, comprise: vacuum casting, be built-in with atomic beam source at vacuum casting, it is characterized in that in this vacuum casting, on the direction of advancing perpendicular to atomic beam source emission atom line, identical first micro zone plates of placing structure parameter and second micro zone plates side by side, in the atom line between first micro zone plates and atomic beam source, put testing sample, on the image planes of first micro zone plates, be equipped with microchannel plate, the electric charge that produces on this microchannel plate is input in the detector that links to each other with computing machine 16, said first, second micro zone plates is the object lens zone plate of wavestrip number of rings N＞100, should satisfy the isochromatic lens imaging formula:
Wherein, f is the focal length of micro zone plates, and u is an object distance, is the distance of testing sample to micro zone plates, and v is an image distance, is the distance of micro zone plates to microchannel plate.
Said first, second micro zone plates is that a wavestrip number of rings N is 350 object lens zone plate.
Said detector is charge-coupled device (CCD).
The utility model is compared with technology formerly, has the following advantages:
1. because between testing sample and microchannel plate, added imaging first micro zone plates, and between atomic beam source and the microchannel plate, added second micro zone plates of placing side by side with first micro zone plates, can reduce requirement greatly to the spatial coherence of atomic beam source, thereby, make measurement mechanism of the present utility model, dwindled greatly than the volume of the pen recorder of technology formerly;
2. the utility model adopts atomic beam source to make light source, and the matter wave wavelength ratio visible wavelength of atom is wanted little 7 magnitudes, so measurement sensitivity is high, and resolution is also high;
3. can measure any physical quantitys that can cause the atomic beam phase change such as electromagnetic field, gravity field;
4. with microchannel plate and the ccd detector medium of noting down, integrate record and digitizing, can carry out real-time reconstruct;
5. carry out digital reconstruction with computing machine at last, can carry out various pre-service,, can improve image quality as smooth noise etc. to hologram.
Description of drawings:
Fig. 1 is in the technology [1] formerly, laser hologram imaging device synoptic diagram.
Fig. 2 is in the technology [2] formerly, the atomic interferometer structural representation.
Fig. 3 is that the utility model is from axle double wave strap holographic image plane recorder with atomic beams synoptic diagram
Embodiment:
See also Fig. 3, the utility model is from axle double wave strap holographic image plane recorder with atomic beams, comprise and placing in the vacuum casting 15, atomic beam from atomic beam source 9 emissions, through first, second micro zone plates 17,18, be divided into two bundles, testing sample 11 places the atom line between first micro zone plates 17 and the atomic beam source 9.The atomic beam of process testing sample 11 is as thing bundle Wb, and thing bundle Wb carries out amplification imaging by first micro zone plates 17 to testing sample 11, and image planes are positioned on the microchannel plate 19.Another atomic beam focuses on through second micro zone plates 18 and produces with reference to point source, and the atomic beam of its outgoing is as reference bundle Cb.Thing bundle Wb and reference bundle Cb meet, and produce interference fringe on microchannel plate 19.Microchannel plate 19 links to each other with ccd detector 20.Because the atom neutral, but by metastable state Ne atomic collision microchannel plate 19 atomic beam source 9 emissions, in the atom line, can produce electric charge, be detected device 20 and receive, the output of detector 20 is connected to computing machine 16 enterprising line number word reconstruct.
Wavestrip number of rings＞100 of said first, second micro zone plates 17,18.Micro zone plates is gained the name because of its diameter is little, claims the object lens zone plate again, can be used as image-forming objective lens.Utilize its higher first-order diffraction of efficient, near the testing sample 11 the focusing carries out amplification imaging.Micro zone plates 17,18 is generally made of electron beam plating, and its resolution is by the decision of zone plate outermost ring width, and the height of resolution can directly have influence on the zone plate image quality.The imaging of micro zone plates 17,18 meets the isochromatic lens imaging formula:
Wherein, f is the focal length of micro zone plates 17, and u is an object distance, and promptly testing sample 11 is to the distance of micro zone plates 17, and v is an image distance, and promptly micro zone plates 17 is to the distance of microchannel plate 19.
Said atomic beam source 9 is metastable state 1S
3Ne
*Atomic source, it can obtain by effluve or laser excitation.The atomic beam magneto optical trap is made up of laser field and magnetic field, can cool off and catches atom, and this technology is widely used as the basic tool of cold atomic beam experiment for many years.
Requirement in the technology formerly, zone plate leave atomic beam source 9 apart from Z
0Must satisfy following conditions:
Z
0≥r
0t/0.16λ
R in the formula
0For the size of atomic beam source 9, get 0.1mm, t is the distance between the first-order diffraction focus of two micro zone plates 17,18.If t=109.5 μ m, the de Broglie wavelength λ of atomic beam=3.3nm tries to achieve: Z
0=20740mm, obviously this size is very big, and the utility model is to adopt image plane holographic figure.Can greatly reduce the requirement of the spatial coherence of light source from axle image plane holographic figure, so, the Z in the utility model
0Can be taken as 415mm, thereby reduce the size of vacuum casting 15.
415mm place at distance atomic beam source 9, place two identical first, second micro zone plates 17,18 of structural parameters side by side, their radius is 34 μ m, and focal length is 0.995mm, the wavestrip number of rings is N=344, and the focus of two micro zone plates is at a distance of t=109.5 μ m.Because wavestrip number of rings N＞100 of micro zone plates, imaging meets the isochromatic lens imaging formula:
U is an object distance in the formula, and v is an image distance.Zone plate 17 is imaged on testing sample 11 as being on the microchannel plate 19 on the plane, the focal distance f of first, second micro zone plates 17,18 is 0.995mm, the distance of testing sample 11 to first micro zone plates 17 is that object distance u is 1mm, and image distance v is 500mm, and then enlargement factor is 500 times.
Claims (2)
1. one kind from axle double wave strap holographic image plane recorder with atomic beams, comprise: vacuum casting (15), be built-in with atomic beam source (9) at vacuum casting (15), it is characterized in that in vacuum casting (15), on the direction of advancing perpendicular to atomic beam source (9) emission atom line, identical first micro zone plates of placing structure parameter (17) and second micro zone plates (18) side by side, in the atom line between first micro zone plates (17) and atomic beam source (9), put testing sample (11), on the image planes of first micro zone plates (17), be equipped with microchannel plate (19), the electric charge that microchannel plate (19) produces is input in the detector (20) that links to each other with computing machine (16), said first, second micro zone plates (17,18) be the object lens zone plate of wavestrip number of rings N＞100, should satisfy the isochromatic lens imaging formula:
Wherein, f is the focal length of micro zone plates (17,18), and u is an object distance, is the distance of testing sample (11) to micro zone plates (17,18), and v is an image distance, is the distance of micro zone plates (17,18) to microchannel plate (19).
2. according to claim 1 from axle double wave strap holographic image plane recorder with atomic beams, it is characterized in that said first, second micro zone plates (17,18) is that wavestrip number of rings N is 350 object lens zone plate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU032285884U CN2599616Y (en) | 2003-01-27 | 2003-01-27 | Off-axis double-waveband plate atomic beam image surface holographic recording device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU032285884U CN2599616Y (en) | 2003-01-27 | 2003-01-27 | Off-axis double-waveband plate atomic beam image surface holographic recording device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100464180C (en) * | 2004-12-15 | 2009-02-25 | 中国科学院上海光学精密机械研究所 | Amplitude-splitting off-axis X-ray holographic device |
-
2003
- 2003-01-27 CN CNU032285884U patent/CN2599616Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100464180C (en) * | 2004-12-15 | 2009-02-25 | 中国科学院上海光学精密机械研究所 | Amplitude-splitting off-axis X-ray holographic device |
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| CF01 | Termination of patent right due to non-payment of annual fee |