CN100353268C - High resolution femtosecond holographic device - Google Patents
High resolution femtosecond holographic device Download PDFInfo
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- CN100353268C CN100353268C CNB2004100167218A CN200410016721A CN100353268C CN 100353268 C CN100353268 C CN 100353268C CN B2004100167218 A CNB2004100167218 A CN B2004100167218A CN 200410016721 A CN200410016721 A CN 200410016721A CN 100353268 C CN100353268 C CN 100353268C
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Abstract
A high resolution femtosecond holographic device comprising a laser light source, characterized by further comprising: the system comprises a grating, a first concave reflector, a second concave reflector, a third concave reflector, a fourth concave reflector, a first diaphragm, a second diaphragm, a sample to be detected, a first lens, a second lens, a detector and a computer, wherein the position relations of the components are as follows: the grating is arranged on a laser output light path of a laser light source, the grating disperses into two beams of light, namely an A beam and a B beam, wherein the B beam enters a detector through a second concave reflecting mirror, a second diaphragm, a third concave reflecting mirror, a sample to be detected and a first lens shrinkage cavity, the A beam enters the detector through a first concave reflecting mirror, a first diaphragm, a fourth concave reflecting mirror and a second lens shrinkage cavity, the B beam and the A beam form a hologram through encounter interference, and the first diaphragm and the second diaphragm are respectively arranged at the focuses of the first concave mirror and the second concave mirror. The invention reduces the requirement on monochromaticity of the femtosecond laser beam and greatly improves the resolution ratio.
Description
Technical field:
The relevant holographic apparatus of the present invention, particularly a kind of high resolving power fs holography device.It can be widely used in testing various ultrafast processes, the generation of for example fracture of the avalanche process of pulsed gas discharge, chemical bond and formation, laser self-focusing silk, and material strain or the like under the extreme condition.
Background technology:
Nature has many basic processes, for example chemical reaction and phase transformation, all relate to the change of structure of matter character and rearranging of atom, for another example during fulmination, the electric discharge phenomena that air is breakdown, these variations usually occur on the ultrafast time scale, suitable with the free period of atom or molecule, be about 100fs or shorter, observe these processes, will nondestructively survey it with a pulse shorter certainly than these processes.
Fortunately, two ten years in the past, the pulsewidth of ultrashort pulse is compressed to the femtosecond magnitude by psec.Though under laboratory condition, the existing report of the generation of Ah's second-time pulse does not enter the practical stage, as yet so femto-second laser pulse is the important means of current detection ultrafast process at present.The Femtosecond Holography that femtosecond pulse is applied to holographic imaging is a technology that has potentiality, has demonstrated its superiority in many field of detecting.
Nineteen eighty-three, Sweden N.Abramson research group mainly utilizes femtosecond and the measurement of picopulse holography research object Shape ', three-dimensional body to discern.The E.Leith research group of the U.S. in 1991 mainly is engaged in the applied research of fs holography technology aspect medical imaging, and they have obtained result preferably with fs holography to seeing through thick thick staff musculature and the tinsel imaging of chicken, 6mm of 6mm.
Nineteen ninety, Mazurenko has proposed the notion of spectrum holography, and its basic thought is to utilize the light frequency spatial dispersion, is a series of quasi-monchromatic waves with reference light and signal pulse in spatial dispersion, and makes the optical frequency component of their correspondences obtain hologram at spatial coherence.1992, people such as A.M.Weiner as recording medium, utilized the firsts and seconds diffracted wave with the non-selective medium heat plastics of spectrum respectively, and in the femtosecond pulse apparatus for shaping, the femtosecond time signal is stored, reproduced and handles, and relevant and convolution algorithm.1993, people such as M.C.Nuss utilized continuous light wave to reproduce the time hologram of ultrashort pulse, the time pulse shape information is transformed into can directly takes by enough cameras exactly.1994, M.C.Nuss utilized the holographic experimental provision of spectrum to realize that signal is from the conversion of domain model then of spatial domain pattern.1998, people such as Y.Ding utilized the dynamic spectrum holography in the anaclasis Multiple Quantum Well, realized the adaptive equalization of ultrafast femto-second laser pulse chromatic dispersion.
In recent years, each country has carried out the micro-machined research of fs holography.1999, people such as Kirkpatrick.S.M prophesy can realize little processing of material by the synchronous ultrafast holographic material that absorbs of two-photon.2000, people such as K.Kawamura and N.Sarukura utilized two femto-second laser pulses telling from same laser instrument, respectively at various non-photosensitivity materials such as SiO
2Glass, sapphire and diamond surface and in-line coding holographic grating.People such as B.Kraabel realize the dynamic holographic of femtosecond pulse in nanocrystal.Calendar year 2001 also is being fruitful 1 year aspect the little processing of fs holography, and K.Kawamura etc. utilize double exposure technique to realize the coding of two mutually orthogonal holographic gratings on silex glass.People such as Yan Li utilize the femtosecond pulse two-beam interference to make volume holographic grating, and diffraction efficiency is 0.7%, have realized writing grating in photosensitive medium inside for the first time.2002, people such as Yan Li write relief grating on organic glass (PMMA) surface and inside again, and its diffraction efficiency can reach 20%.Yet, the coherent length of femtosecond pulse is short, the live width of femto-second laser is all more than 5nm, and pulse is short more, live width is wide more, and is very difficult at the high-resolution hologram of femtosecond time scale photographs, for example uses the pulse recording of 100fs, the striped number that hologram comprises will be less than 100, and this has seriously reduced the visual field of resolution and hologram.
Summary of the invention:
The technical problem to be solved in the present invention is to overcome the deficiency of above-mentioned technology formerly, proposes a kind of high resolving power fs holography device, to have reduced the requirement to the monochromaticity of femtosecond laser beam, improves resolution greatly.
Basic design of the present invention is: adopt a high-resolution holographic grating as beam splitting and dispersion element, adopt two concave mirrors to form one then and expand bundle telescope system system, dispose a diaphragm in their focus, a polychrome ripple is become monochromatic wave, carry out record again.
Technical solution of the present invention is as follows:
A kind of high resolving power fs holography device, comprise LASER Light Source, it is characterized in that also comprising: grating, first, second, third and fourth concave mirror, first, second diaphragm, testing sample, first, second lens, detector and computing machine, the position relation of above-mentioned each component is as follows: establish this grating on the laser output light path of LASER Light Source, become two-beam through this grating dispersion, be A light beam and B light beam, wherein the B light beam is through second concave mirror, second diaphragm, the 3rd concave mirror, testing sample, and enter detector by the first lens shrinkage cavity, described A light beam is through first concave mirror, first diaphragm, the 4th concave mirror, and enter detector by the second lens shrinkage cavity, B light beam and A light beam light are met to interfere and are formed hologram, first, second diaphragm is placed on first respectively, the focus place of second concave mirror.
Said LASER Light Source is a femto-second laser, and pulsewidth is that 5-150fs, single pulse energy are 0.01-10 μ j, and bandwidth is 5-30nm, and radiation wavelength is the CPA titanium sapphire laser system of 780-830nm.
Said grating is the grating that sees through of 5000 a lines/mm, and it becomes two-beam with the femto-second laser chromatic dispersion of vertical incidence, i.e. A bundle and B bundle (transmitted light does not draw among the figure).
Said first, second concave mirror is that radius-of-curvature is a 300-1000mm plating deielectric-coating completely reflecting mirror.
Said the 3rd, the 4th concave mirror is that a radius-of-curvature is a 600-2000mm plating deielectric-coating completely reflecting mirror.Second, third concave mirror, the first, the 4th concave mirror is respectively formed a beam expander system respectively.
Said the one the second diaphragms are apertures that are of a size of 0.1-1.8mm, are placed on the focus place of first, second concave mirror respectively, and it is used for the femtosecond laser spectrum that chromatic dispersion is opened is carried out filtering and monochromatization.
Said first, second lens are achromat, be to be used for femtosecond laser beam is carried out the shrinkage cavity imaging so that and detector carry out aperture coupling.
Said testing sample is one and waits to study and survey pulsed plasma system that produces ultrafast process or the optical system that produces the autohemagglutination silk.
Said detector is a ccd detector that 780-830nm is had the sensitive spectroscopy response.
Said computing machine is a computing machine that can be used for real-time reconstruct fs holography figure.
Technique effect of the present invention is as follows:
After the light beam of femto-second laser radiation entered grating, producing positive and negative first-order diffraction light became A bundle and B bundle.A bundle light focuses on through concave mirror, and by diaphragm filtering monochromatization, again through concave reflection mirror reflection and reaming, enter into second lens and carry out shrinkage cavity, and be imaged on the detector as with reference to light, B bundle light focuses on through second concave mirror, and by the second diaphragm filtering monochromatization, through the 3rd concave reflection mirror reflection and reaming, incide in the sample and go again, the information that carries sample becomes object beam, be imaged on the detector and the A light beam meets to interfere and forms hologram through the first lens shrinkage cavity, after the digitizing,, obtained to wait to study the ultrafast information of object by Computer Storage and reconstruct.When light path design and making, the symmetry owing in the design is easy to A light beam and B light beam aplanatism, thereby has reduced the requirement to the monochromaticity of femtosecond laser beam.
High resolving power fs holography device of the present invention owing to adopt grating to make beam splitting element, can carry out effective chromatic dispersion with wideband spectrum, carries out the filtering monochromatization with aperture then, greatly reduces the requirement to equivalent optical path, and resolution can become order of magnitude ground to improve.
Description of drawings:
Fig. 1 is a high resolving power fs holography apparatus structure synoptic diagram of the present invention.
Embodiment:
High resolving power fs holography device of the present invention as shown in Figure 1, high resolving power fs holography device of the present invention, comprise LASER Light Source 1, it is characterized in that also comprising: grating 2, first, second, third and fourth concave mirror 3,4,7,8, first, second diaphragm 5,6, testing sample 11, first, second lens 9,10, detector 12 and computing machine 13, the position relation of above-mentioned each component is as follows: establish this grating 2 on the laser output light path of LASER Light Source 1, become two-beam through these grating 2 chromatic dispersions, be A light beam and B light beam, wherein the B light beam is through second concave mirror 4, second diaphragm 6, the 3rd concave mirror 7, testing sample 11, and enter detector 12 by 9 shrinkage cavities of first lens, described A light beam is through first concave mirror 3, first diaphragm 5, the 4th concave mirror 8, and enter detector 12 by 10 shrinkage cavities of second lens, B light beam and A light beam light are met to interfere and are formed hologram, first, second diaphragm 5,6 is placed on first respectively, second concave mirror 3,4 focus place.
Said femto-second laser 1 is that a pulsewidth is that 100fs, single pulse energy are 1 μ j, and bandwidth is 10nm, and radiation wavelength is the CPA titanium sapphire laser system of 800nm.
Said grating 2 is the gratings that see through of 5000 a lines/mm, and it becomes two-beam with femto-second laser 1 chromatic dispersion of vertical incidence, i.e. A bundle and B bundle (transmitted light does not draw among the figure).
Said first, second concave mirror 3,4th, radius-of-curvature are 1000mm plating deielectric-coating completely reflecting mirror.
Said the 3rd, the 4th concave mirror 7,8th, radius-of-curvature are 2000mm plating deielectric-coating completely reflecting mirror.Second, third concave mirror 4,7 and the first, the 4th concave mirror 3,8 are respectively formed a beam expander system.
Said first, second diaphragm 5,6 is apertures that are of a size of 0.5mm, is placed on the focus place of first, second concave mirror 3,4 respectively, and it is used for the femtosecond laser spectrum that chromatic dispersion is opened is carried out filtering and monochromatization.
Said first, second lens 9,10 are achromat, are to be used for femtosecond laser beam is carried out the shrinkage cavity imaging so that and detector 12 carry out aperture coupling.
Said testing sample 11 is one and waits to study and survey pulsed plasma system that produces ultrafast process or the optical system that produces the autohemagglutination silk.
Said detector 12 is ccd detectors that 800nm had the sensitive spectroscopy response.
Said computing machine 13 is the computing machines that can be used for real-time reconstruct fs holography figure.
The principle of work and the basic process of the high explanation of the present invention fs holography device are:
When the pulsewidth of femto-second laser 1 radiation is after 100fs, 800nm light beam enter grating 2, producing positive and negative first-order diffraction light becomes A light beam and B light beam.The A light beam focuses on through first concave mirror 3, and by the 5 filtering monochromatizations of first diaphragm, again through 8 reflection and the reamings of the 4th concave mirror, enter into lens 10 and carry out shrinkage cavity, and be imaged on the detector 12 as with reference to light, the B light beam focuses on through second concave mirror 4, and by the 6 filtering monochromatizations of second diaphragm, through concave mirror 7 reflection and reamings, incide in the testing sample 11 and go again, the information that carries testing sample 11 becomes object beam, be imaged on the detector 12 and A bundle light meets to interfere and forms hologram through 9 shrinkage cavities of first lens, after the digitizing, stored and reconstruct, obtained to wait to study the ultrafast information of object by computing machine 13.When light path design and making, the symmetry owing in the design is easy to A light beam and B light beam aplanatism, thereby has reduced the requirement to the monochromaticity of femtosecond laser beam.
Claims (7)
1, a kind of high resolving power fs holography device, comprise LASER Light Source (1), it is characterized in that also comprising: grating (2), first, second, third and fourth concave mirror (3,4,7,8), first, second diaphragm (5,6), testing sample (11), first, second lens (9,10), detector (12) and computing machine (13), the position relation of above-mentioned each component is as follows: establish this grating (2) on the laser output light path of LASER Light Source (1), become two-beam through this grating (2) chromatic dispersion, be A light beam and B light beam, wherein the B light beam is through second concave mirror (4), second diaphragm (6), the 3rd concave mirror (7), testing sample (11), and enter detector (12) by first lens (9) shrinkage cavity, described A light beam is through first concave mirror (3), first diaphragm (5), the 4th concave mirror (8), and enter detector (12) by second lens (10) shrinkage cavity, meet to B light beam and A light beam light aplanatism to interfere and form hologram, first, second diaphragm (5,6) be placed on first respectively, second concave mirror (3,4) focus place, described LASER Light Source (1) is a femto-second laser, pulsewidth is 5-150fs, single pulse energy is 0.01-10 μ j, bandwidth is 5-30nm, and radiation wavelength is the CPA titanium sapphire laser system of 780-830nm.
2 high resolving power fs holography devices according to claim 1 is characterized in that described grating (2) is the grating that sees through of 5000 a lines/mm.
3, high resolving power fs holography device according to claim 1 is characterized in that described first, second concave mirror (3,4) is that radius-of-curvature is a 300-1000mm plating deielectric-coating completely reflecting mirror.
4, high resolving power fs holography device according to claim 1 is characterized in that described the 3rd, the 4th concave mirror (7,8), is that radius-of-curvature is a 600-2000mm plating deielectric-coating completely reflecting mirror.
5, high resolving power fs holography device according to claim 1 is characterized in that described first, second lens (9,10) are achromat.
6, high resolving power fs holography device according to claim 1 is characterized in that described detector (12) is a ccd detector that 780-830nm is had the sensitive spectroscopy response.
7, high resolving power fs holography device according to claim 1 is characterized in that described computing machine (13) is a computing machine that can be used for real-time reconstruct fs holography figure.
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| CNB2004100167218A CN100353268C (en) | 2004-03-04 | 2004-03-04 | High resolution femtosecond holographic device |
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| CNB2004100167218A CN100353268C (en) | 2004-03-04 | 2004-03-04 | High resolution femtosecond holographic device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20220121022A1 (en) * | 2019-10-28 | 2022-04-21 | Huazhong University Of Science And Technology | High-speed stereo 3d multimodal imaging system and method |
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| CN105866968B (en) * | 2016-05-31 | 2019-05-24 | 武汉理工大学 | A kind of dispersion compensation device based on diffraction lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2505876Y (en) * | 2001-10-26 | 2002-08-14 | 中国科学院广州电子技术研究所 | Composite dynamic hologram shooting device |
| WO2003069416A1 (en) * | 2002-02-13 | 2003-08-21 | Japan Science And Technology Agency | Method for producing hologram by pico-second laser |
| CN1474202A (en) * | 2003-08-08 | 2004-02-11 | 中国科学院上海光学精密机械研究所 | Working device for forming two-dimensional nanoscale periodic structure by femtosecond laser single pulse |
| CN2751299Y (en) * | 2004-09-29 | 2006-01-11 | 中国科学院上海光学精密机械研究所 | Femtosecond holographic device with ultrafast high-resolution and chromatic dispersion element |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2505876Y (en) * | 2001-10-26 | 2002-08-14 | 中国科学院广州电子技术研究所 | Composite dynamic hologram shooting device |
| WO2003069416A1 (en) * | 2002-02-13 | 2003-08-21 | Japan Science And Technology Agency | Method for producing hologram by pico-second laser |
| CN1474202A (en) * | 2003-08-08 | 2004-02-11 | 中国科学院上海光学精密机械研究所 | Working device for forming two-dimensional nanoscale periodic structure by femtosecond laser single pulse |
| CN2751299Y (en) * | 2004-09-29 | 2006-01-11 | 中国科学院上海光学精密机械研究所 | Femtosecond holographic device with ultrafast high-resolution and chromatic dispersion element |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220121022A1 (en) * | 2019-10-28 | 2022-04-21 | Huazhong University Of Science And Technology | High-speed stereo 3d multimodal imaging system and method |
| US11880027B2 (en) * | 2019-10-28 | 2024-01-23 | Huazhong University Of Science And Technology | High-speed stereo 3D multimodal imaging system and method |
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