CN101916570A - Synthetic Aperture Femtosecond Pulse Digital Holographic Recording Device - Google Patents
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Abstract
A synthetic aperture femtosecond pulse digital holographic recording device is characterized in that a precise electric micropositioner is used for changing the time delay between object light and reference light, a detector is used for recording a plurality of sub-holograms in different interference areas, a computer is used for reconstructing the femtosecond digital hologram of a sample to be detected in real time, the interference area of the recorded hologram is effectively increased, the space bandwidth product is improved, the resolution ratio of a femtosecond pulse digital holographic reproduction image is improved, and the view field is increased.
Description
Technical field
The present invention relates to the ultrashort laser pulse Digital Holography, particularly a kind of synthetic-aperture femtosecond-pulse digital holographic recording device that improves resolution and increase visual field.
Background technology
Along with the development of high reading speed and high-resolution imaging device CCD (charge-coupled image sensor) or CMOS (metal-oxide semiconductor (MOS)), Digital Holography has been widely used in technical fields such as micro-imaging, image recognition and encryption.Recently, Digital Holography obtains people and more and more pays close attention in the application in ultrashort pulse field.By digital hologram and pump probe technology, can study some the ultrafast transient phenomenons in ultrashort laser pulse and the material, ablate and the optical breakdown of transparent material inside etc. such as induced with laser fusing, material surface.Utilize the ultrashort pulse Digital Holography, can also carry out measurement of depth resolution and biological sample or the like.
But the ultrashort laser pulse holography exists weak point.When laser pulse width becomes very in short-term and since limited pulse-width restricting the coherence of pulse laser on room and time, the interference region after making two pulse lasers intersect is only limited in the very little part in overlay region.As angle is that the interference regions of the two bundle colliding pulse laser beams of θ are c τ (sin θ/2)
-1, wherein, c is the light velocity, and τ is a pulse width, and for example pulse width is 90fs, and angle is that the interference region of 5 ° two bundle of pulsed laser light beam approximately has only 600 μ m.The number of interference fringe does not rely on the angle of two interference pulse laser and changes, it is 2c τ/λ, wherein λ is an optical wavelength, for example use the 90fs pulsewidth, the pulse recording of 800nm wavelength, the number of interference fringes of its hologram has only about 60, the reduction that this is serious the resolution and the visual field of hologram reconstruction picture.In order to eliminate the weak coherence of ultra-short pulse laser, people such as Z.Ansari utilize dispersing prism to produce the inclination pulse and eliminate weak coherence [seeing technology 1:z.Ansari et al formerly, Opt.Lett.6,334 (2001)]; People such as A.A.Maznev utilize inferior two pulse lasers that make of grating diffration level to interfere, thereby eliminate the short relevant restriction [seeing technology 2:A.A.Maznev et al formerly, Opt.Lett.17,1378 (1998)] of ultra-short pulse laser.But these technology all exist some shortcomings, utilize prism or grating to eliminate weak coherence, have changed the pulsewidth of ultrashort laser pulse simultaneously, have made the pulse width broadening.Use the high-resolution holographic grating as beam splitting and dispersion element, just reduce monochromaticity requirement femtosecond laser by filtering technique.
Summary of the invention
The technical problem to be solved in the present invention is to overcome the deficiency of above-mentioned technology formerly, has proposed a kind of synthetic-aperture femtosecond-pulse digital holographic recording device, and this device can improve resolution and the visual field that the femtosecond laser digital hologram reproduces picture.
Basic design of the present invention is: the mobile interference region of pulse laser that makes by the computer control micromotion platform moves on the diverse location of ccd detector.Ccd detector record multi-frame interferometry zone utilizes digital image processing techniques to synthesize a width of cloth digital hologram at the subhologram at diverse location place then, reproduces picture to obtain high-resolution digital hologram.
Technical solution of the present invention is as follows:
A kind of synthetic-aperture femtosecond-pulse digital holographic recording device, characteristics are that its formation comprises LASER Light Source, first semi-transparent semi-reflecting lens, second semi-transparent semi-reflecting lens, first completely reflecting mirror, second completely reflecting mirror, the 3rd completely reflecting mirror and the 4th completely reflecting mirror, electronic micromotion platform, testing sample, detector and computing machine, the position relation of above-mentioned each component is as follows:
Femtosecond laser is after described LASER Light Source outgoing, be divided into the object beam of reflection and the reference beam of transmission through first semi-transparent semi-reflecting lens, described reference beam is gone into detector through first completely reflecting mirror and the second semi-transparent semi-reflecting mirror reflection are laggard, described object beam is through second completely reflecting mirror, the 3rd completely reflecting mirror and the reflection of the 4th completely reflecting mirror, see through testing sample, after the second semi-transparent semi-reflecting lens transmission, enter detector, described object beam and reference beam meet to interfere in detector and form hologram, the described second and the 3rd completely reflecting mirror is placed on the electronic micromotion platform, forms a variable delay device.Described electronic micromotion platform is connected with computing machine with detector.
The embodiment of described femtosecond laser light source is a laser instrument, and pulsewidth is 90fs, and output power is greater than 250mW, and bandwidth is greater than 50nm, and radiation wavelength is 780nm-840nm, and centre wavelength is 800nm, and repetition frequency is the titanium sapphire laser system of 76MHz.
Described first semi-transparent semi-reflecting lens and second semi-transparent semi-reflecting lens all are semi-transparent semi-reflecting lens of a wide spectrum deielectric-coating.
Described first completely reflecting mirror, second completely reflecting mirror, the 3rd completely reflecting mirror, the 4th completely reflecting mirror all are silver-plated completely reflecting mirrors; Described second completely reflecting mirror and the 3rd completely reflecting mirror are fixed on the electronic micromotion platform, form a deferred mount.
Described electronic micromotion platform is that a stepping accuracy is tens nanometers, can move along fixed-direction is accurate, but and the platform of resetting.
Described testing sample is the transmission-type sample of pellucidity.
Described detector is a ccd detector that 780nm-840nm is had the sensitive spectroscopy response.
Described computing machine is the computing machine of the real-time reconstruct femtosecond digital of an energy hologram.
The basic operational steps of described synthetic-aperture femtosecond-pulse digital holographic recording device is: described femtosecond laser is after described LASER Light Source outgoing, be divided into two-beam through first semi-transparent semi-reflecting lens, be object beam and reference beam, wherein said reference beam is gone into detector through first completely reflecting mirror and the second semi-transparent semi-reflecting mirror reflection are laggard, described object beam is through second catoptron, the 3rd catoptron and the 4th mirror reflects, see through testing sample, enter detector after the second semi-transparent semi-reflecting lens transmission, described object beam and reference beam meet to interfere in detector and form hologram.The described second and the 3rd completely reflecting mirror is placed on the electronic micromotion platform, forms a variable delay device.Described electronic micromotion platform is connected with computing machine with detector.The interference region that can make pulse laser that moves of described computer control micromotion platform moves on the diverse location direction of ccd detector.Described detector record multi-frame interferometry zone is at the subhologram at diverse location place, utilize digital image processing techniques to synthesize a width of cloth digital hologram then, carry out digital reconstruction by computing machine by diffraction algorithms, finally obtain high-resolution digital hologram and reproduce picture.
The invention has the beneficial effects as follows:
When the laser pulse light beam of femtosecond energizer radiation after first semi-transparent semi-reflecting lens is beamed into two-beam, a branch of conduct is with reference to light, and is a branch of as the record object beam.Wherein behind the object beam process electric variable delayer, make to produce the regular hour delay between object beam and the reference light, thing light and the reference light interference region in detector is moved along a certain direction by different time delays.Utilize ccd detector to be recorded in one group of subhologram of different interference regions, with computer real-time reconstruct femtosecond digital hologram, increase the interference area of institute's recorded hologram effectively, improved space-bandwidth product, improve the resolution of femtosecond-pulse digital holographic reconstructed image, increased the visual field.
And in the said process, do not use devices such as prism or grating, do not change the pulsewidth of pulse laser, avoided the complicacy of light path.
Description of drawings
Fig. 1 is a synthetic-aperture femtosecond-pulse digital holographic recording device structural representation of the present invention.
Among the figure: 1-LASER Light Source, 2-first semi-transparent semi-reflecting lens, 3-first completely reflecting mirror, 4-second completely reflecting mirror, 5-the 3rd completely reflecting mirror, 6-the 4th completely reflecting mirror, the electronic micromotion platform of 7-, 8-testing sample, 9-second semi-transparent semi-reflecting lens, 10-detector, 11-computing machine.
Fig. 2 is a synthetic-aperture femtosecond-pulse digital reproduction processes synoptic diagram.
Embodiment
The invention will be further described below in conjunction with embodiment and accompanying drawing.
Synthetic-aperture femtosecond-pulse digital holographic recording device of the present invention as shown in Figure 1, as seen from the figure, synthetic-aperture femtosecond-pulse digital holographic recording device of the present invention, comprise LASER Light Source 1, first semi-transparent semi-reflecting lens 2, second semi-transparent semi-reflecting lens 9, first completely reflecting mirror 3, second completely reflecting mirror 4, the 3rd completely reflecting mirror 5 and the 4th completely reflecting mirror 6, electronic micromotion platform 7, testing sample 8, detector 10 and computing machine 11, the position relation of above-mentioned each component is as follows:
Femtosecond laser is after described LASER Light Source 1 outgoing, be divided into two-beam through first semi-transparent semi-reflecting lens 2, be object beam and reference beam, wherein said reference beam enters detector 10 after first completely reflecting mirror 3 and 9 reflections of second semi-transparent semi-reflecting lens, described object beam is after second completely reflecting mirror 4, the 3rd completely reflecting mirror 5 and 6 reflections of the 4th completely reflecting mirror, see through testing sample 8, enter detector 10 after 9 transmissions of second semi-transparent semi-reflecting lens, described object beam and reference beam meet to interfere in detector 10 and form hologram.Described second completely reflecting mirror 4 and the 3rd completely reflecting mirror 5 are placed on the electronic micromotion platform 7, form a variable delay device.Described electronic micromotion platform 7 is connected with described computing machine 11 with detector 10.
In the present embodiment:
Described femtosecond laser light source 1 is a laser instrument, and pulsewidth is 90fs, and output power is greater than 250mW, and bandwidth is greater than 50nm, and radiation wavelength is 780nm-840nm, and centre wavelength is 800nm, and repetition frequency is the titanium sapphire laser system of 76MHz.
Described first semi-transparent semi-reflecting lens 2 and second semi-transparent semi-reflecting lens 9 all are semi-transparent semi-reflecting lens of a wide spectrum deielectric-coating.
Described first completely reflecting mirror 3, second completely reflecting mirror 4, the 3rd completely reflecting mirror 5, the 4th completely reflecting mirror 6 all are silver-plated completely reflecting mirrors; Described second completely reflecting mirror 4 and the 3rd completely reflecting mirror 5 are fixed on the electronic micromotion platform 7, form a deferred mount.
Described electronic micromotion platform 7 is tens nanometers for stepping accuracy, can move along fixed-direction is accurate, but and the platform of resetting.
Described testing sample is the transmission-type sample of 8 pellucidities.
Described detector 10 is ccd detectors that 780nm-840nm had the sensitive spectroscopy response.
Described computing machine 11 is computing machines of the real-time reconstruct femtosecond digital of an energy hologram.
The principle of work and the basic process of synthetic-aperture femtosecond-pulse digital holographic recording device of the present invention are:
Femtosecond laser is after described LASER Light Source 1 outgoing, be divided into two-beam through first semi-transparent semi-reflecting lens 2, be object beam and reference beam, wherein said reference beam is after first completely reflecting mirror 3 and 9 reflections of second semi-transparent semi-reflecting lens, as interfering the reference light in the record to enter detector 10; Described object beam is after second completely reflecting mirror 4, the 3rd completely reflecting mirror 5 and 6 reflections of the 4th completely reflecting mirror, see through testing sample 8 and form the object beam that carries sample message, enter detector 10 after 9 transmissions of second semi-transparent semi-reflecting lens, described object beam that carries sample message and reference beam meet to interfere in detector 10 and form hologram.
Described second completely reflecting mirror 4 and the 3rd completely reflecting mirror 5 are placed on the electronic micromotion platform 7, form a variable delay device.After the described object beam that carries sample message passes through the electric variable delayer, make to produce the regular hour delay between object beam and the reference light, thing light and the interference region of reference light in detector 10 are moved along a horizontal direction by different time delays.
Described ccd detector 10 is recorded in several subholograms of different interference regions, deposit computing machine 11 after the digitizing in, utilize Digital Image Processing can synthesize a width of cloth digital hologram then, carry out digital reconstruction by computing machine 11 by diffraction algorithms, the high-resolution digital hologram of final acquisition reproduces picture, thereby increases the interference area of institute's recorded hologram effectively, improves its space-bandwidth product, and then improved the resolution that digital hologram reproduces picture, increased the visual field.
Digital hologram is by computing machine 11 real-time reconstruct, used reconstructing method is that existing digital hologram reproduces algorithm [referring to E.Cuche et al among the present invention, Appl.Opt.39,4070 (2000)], its digital reproduction process is as shown in Figure 2: synthetic hologram after Fourier transform, is obtained the spectrum distribution of hologram.Then, after Filtering Processing, only included object under test information+1 grade of frequency spectrum.At last, after inverse Fourier transform, reconstruct has obtained the change information of object under test.
Synthetic-aperture femtosecond-pulse digital holographic recording device of the present invention, utilize synthetic aperture technique to increase the interference area of institute's recorded hologram effectively, improve its space-bandwidth product, and then improved the resolution of femtosecond-pulse digital holographic reconstructed image, increased the visual field.And this device only changes time delay between thing light and the reference light by an electronic micropositioner of precision, write down several subholograms of different interference regions, improve the resolution of reproducing picture and increase the visual field, do not use devices such as prism or grating, do not change the pulsewidth of femtosecond pulse, avoided the complicacy of device.
Claims (8)
1. synthetic-aperture femtosecond-pulse digital holographic recording device, comprise LASER Light Source (1), it is characterized in that also comprising: first semi-transparent semi-reflecting lens (2), second semi-transparent semi-reflecting lens (9), first completely reflecting mirror (3), second completely reflecting mirror (4), the 3rd completely reflecting mirror (5) and the 4th completely reflecting mirror (6), electronic micromotion platform (7), testing sample (8), detector (10) and computing machine (11), the position relation of above-mentioned each component is as follows:
Femtosecond laser is after described LASER Light Source (1) outgoing, be divided into the object beam of reflection and the reference beam of transmission through first semi-transparent semi-reflecting lens (2), described reference beam enters described detector (10) after first completely reflecting mirror (3) and second semi-transparent semi-reflecting lens (9) reflection, described object beam is through second completely reflecting mirror (4), the 3rd completely reflecting mirror (5) and the 4th completely reflecting mirror (6) reflection, see through testing sample (8), after second semi-transparent semi-reflecting lens (9) transmission, enter described detector (10), described object beam and reference beam meet to interfere in detector (10) and form hologram, described second completely reflecting mirror (4) and the 3rd completely reflecting mirror (5) are placed on the described electronic micromotion platform (7), form a variable delay device, described electronic micromotion platform (7) is connected with described computing machine (11) with detector (10).
2. synthetic-aperture femtosecond-pulse digital holographic recording device according to claim 1, it is characterized in that described femtosecond laser light source (1) is a laser instrument, pulsewidth is 90fs, output power is greater than 250mW, bandwidth is greater than 50nm, radiation wavelength is 780nm-840nm, and centre wavelength is 800nm, and repetition frequency is the titanium sapphire laser system of 76MHz.
3. synthetic-aperture femtosecond-pulse digital holographic recording device according to claim 1 is characterized in that described first semi-transparent semi-reflecting lens (2) and second semi-transparent semi-reflecting lens (9) all are semi-transparent semi-reflecting lens of a wide spectrum deielectric-coating.
4. synthetic-aperture femtosecond-pulse digital holographic recording device according to claim 1 is characterized in that described first completely reflecting mirror (3), second completely reflecting mirror (4), the 3rd completely reflecting mirror (5), the 4th completely reflecting mirror (6) all are silver-plated completely reflecting mirrors; Described second completely reflecting mirror (4) and the 3rd completely reflecting mirror (5) are fixed on (7) on the electronic micromotion platform, form a deferred mount.
5. synthetic-aperture femtosecond-pulse digital holographic recording device according to claim 1 is characterized in that described electronic micromotion platform (7) is that a stepping accuracy is tens nanometers, can move along fixed-direction is accurate, but and the platform of resetting.
6. synthetic-aperture femtosecond-pulse digital holographic recording device according to claim 1 is characterized in that described testing sample (8) is the transmission-type sample of pellucidity.
7. synthetic-aperture femtosecond-pulse digital holographic recording device according to claim 1 is characterized in that described detector (10) is a ccd detector that 780nm-840nm is had the sensitive spectroscopy response.
8. synthetic-aperture femtosecond-pulse digital holographic recording device according to claim 1 is characterized in that described computing machine (11) is the computing machine of the real-time reconstruct femtosecond digital of an energy hologram.
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Cited By (7)
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| CN102402172A (en) * | 2011-11-30 | 2012-04-04 | 昆明理工大学 | Three-dimensional real time super-resolution digital holography recording system |
| CN102436168A (en) * | 2011-09-30 | 2012-05-02 | 深圳大学 | Multi-channel digital holographic imaging system and method |
| CN103849816A (en) * | 2012-12-04 | 2014-06-11 | 上海梅山钢铁股份有限公司 | Flexible anti-bulging tinning plate suitable for flower basket barrel and manufacturing method of flexible anti-bulging tinning plate |
| CN104538827A (en) * | 2014-12-15 | 2015-04-22 | 中国航空工业集团公司北京航空制造工程研究所 | Light beam purification method and solid laser device based on digital holography technology |
| CN105932531A (en) * | 2016-05-31 | 2016-09-07 | 中国科学院高能物理研究所 | High repetition frequency laser pulse generation and time delay calibration method |
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| CN102436168A (en) * | 2011-09-30 | 2012-05-02 | 深圳大学 | Multi-channel digital holographic imaging system and method |
| CN102436168B (en) * | 2011-09-30 | 2013-10-09 | 深圳大学 | Multi-channel digital holographic imaging system and method |
| CN102402172A (en) * | 2011-11-30 | 2012-04-04 | 昆明理工大学 | Three-dimensional real time super-resolution digital holography recording system |
| CN102402172B (en) * | 2011-11-30 | 2015-03-11 | 昆明理工大学 | Three-dimensional real time super-resolution digital holography recording system |
| CN103849816A (en) * | 2012-12-04 | 2014-06-11 | 上海梅山钢铁股份有限公司 | Flexible anti-bulging tinning plate suitable for flower basket barrel and manufacturing method of flexible anti-bulging tinning plate |
| CN103849816B (en) * | 2012-12-04 | 2016-04-06 | 上海梅山钢铁股份有限公司 | Be applicable to gaily decorated basket bucket with having resisted stupefied soft tin-plate |
| CN104538827A (en) * | 2014-12-15 | 2015-04-22 | 中国航空工业集团公司北京航空制造工程研究所 | Light beam purification method and solid laser device based on digital holography technology |
| CN104538827B (en) * | 2014-12-15 | 2017-08-04 | 中国航空工业集团公司北京航空制造工程研究所 | A kind of beam cleanup method and solid state laser based on Digital Holography |
| CN105932531A (en) * | 2016-05-31 | 2016-09-07 | 中国科学院高能物理研究所 | High repetition frequency laser pulse generation and time delay calibration method |
| CN107782713A (en) * | 2016-08-24 | 2018-03-09 | 中国科学院光电研究院 | A kind of Laser induced plasma spectroscopy analytical equipment of achievable laser pulse width from femtosecond to psec consecutive variations |
| CN110646809A (en) * | 2019-08-27 | 2020-01-03 | 广州中国科学院先进技术研究所 | Fire environment smoke penetration detection method and system and use method thereof |
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