CN1542569A - Digital holographic double-exposure phase difference amplifying device - Google Patents
Digital holographic double-exposure phase difference amplifying device Download PDFInfo
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- CN1542569A CN1542569A CNA2003101084928A CN200310108492A CN1542569A CN 1542569 A CN1542569 A CN 1542569A CN A2003101084928 A CNA2003101084928 A CN A2003101084928A CN 200310108492 A CN200310108492 A CN 200310108492A CN 1542569 A CN1542569 A CN 1542569A
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Abstract
The digital holographic two-time exposure phase difference amplifying device comprises a laser light source and is characterized in that a beam expanding telescope and a first semi-transparent semi-reflecting mirror are sequentially arranged along the advancing direction of a laser beam emitted by the laser light source, the transmission light direction of the first semi-transparent semi-reflecting mirror reaches a second semi-transparent semi-reflecting mirror through a first full-reflecting concave mirror, the reflection light direction of the first semi-transparent semi-reflecting mirror reaches the second semi-transparent semi-reflecting mirror through a second full-reflecting concave mirror, and then the first semi-transparent semi-reflecting mirror, a lens, a detector and a computer are sequentially arranged, wherein the detector is a Charge Coupler (CCD) and is positioned on the focal length of the lens. And placing a sample to be detected in a transmission light path between the first semi-transparent semi-reflecting mirror and the first full-reflecting concave mirror, and obtaining phase difference amplification through twice exposure and reconstruction by using a computer.
Description
Technical field:
The present invention relates to the holographic phase difference amplifying technique, particularly a kind of digital hologram double exposure phase difference amplifying device has extremely application prospects at aspects such as the accurate detections of optical wave-front.
Background technology:
The holographic phase difference amplifying technique is meant: a hologram that contains phase information, the A that is come from outgoing in two arms of Mach-Chen Deer interferometer, B two bundle coherent light illumination (as shown in Figure 1), produce 0 grade separately, ± 1, ± M, ± N ... the order diffraction ripple, adjust two arms of Mach-Chen Deer interferometer respectively, allow A bundle produce on the hologram+M level (or-N level) diffracted wave and B bundle produce on hologram-N order diffraction ripple, overlapping on the focal plane of the lens that are placed on the hologram back, use the non-overlapped part of diaphragm elimination again, because object wave and its conjugate wave from reconstruct on the hologram are that the position is mutually opposite, be that A restraints after generation+M order diffraction ripple and the generation of B bundle-N order diffraction ripple stack, to produce interference, phasic difference is amplified to original (M+N) doubly, repeat said process n time, then phasic difference amplifies 2
N (M+N)Doubly.
This holographic phase difference amplifying technique need be carried out n dark place to the hologram egative film and be handled, and this non real-time has limited its practical application to a certain extent.
Summary of the invention:
The technical problem to be solved in the present invention is to overcome the deficiency of above-mentioned existing phase difference amplification, and a kind of digital hologram double exposure phase difference amplifying device is provided.
Ordinary optical holographic phase difference amplifying technique as discussed earlier, promptly use the phase information of a photographic plate recording object, utilize diffraction principle to reconstruct the diffracted wave of their different diffraction level time then, allow their the overlapping interference of conjugate wave again, circulation so repeatedly obtains the high power phasic difference and amplifies.The design of digital hologram phase difference amplifying device of the present invention is: inherit the basic thought of ordinary optical holographic phase difference amplifying technique, but different means have been adopted in record, storage and the reconstruct of hologram:
The first has replaced holographic dry plate as recording medium with the CCD charge-coupled device, and the hologram that records is stored in the computing machine after digitized processing.
It two is handle to replace optical diffraction with digital fourier transformation to finish the reconstruct of the thing field of being write down, by the hologram intensity distributions that is write down is made fast Fourier transformation operation, obtaining its spatial frequency spectrum distributes, therefrom separate and extract the frequency spectrum of thing light wave, through the inverse Fourier transform computing, just obtain thing multiplexed optical wave distribution of amplitudes again.
The COMPLEX AMPLITUDE of supposing the thing light wave is:
O(x，y)＝O
0(x，y)exp[jΦ
0(x，y)]
O in the formula
0(x, y) and Φ
0(x y) is respectively the thing light wave and distributes mutually in the amplitude and the position of record on the plane, if certain reason: electromagnetic field, thermal effect, gravity etc. cause object change mutually into Φ ' (x, y), so new thing multiplexed optical wave distribution of amplitudes is:
O′(x，y)＝O
0(x，y)exp[jΦ′
0(x，y)]
Two states before and after changing is done digital addition with double exposing to be recorded on the hologram, and then carry out digital fourier transformation and Filtering Processing, its stack light intensity distribution and expression formula then is:
This shows, the numeral phase difference amplification, just the PHASE DISTRIBUTION function in the COMPLEX AMPLITUDE of thing field is multiplied by an integer factor, N for example, just phasic difference can be amplified N doubly, fringe spacing representative this moment be 2 π/N phase change, we can obtain more, abundant variation details more from stripe pattern like this.
Technical solution of the present invention is as follows:
A kind of digital hologram double exposure phase difference amplifying device, comprise LASER Light Source, the working direction that it is characterized in that the laser beam sent along LASER Light Source has beam expanding telescope, first semi-transparent semi-reflecting lens successively, the transmitted light direction of this first semi-transparent semi-reflecting lens is all-trans concave mirror to second semi-transparent semi-reflecting lens through first, the reflected light direction of this first semi-transparent semi-reflecting lens arrives second semi-transparent semi-reflecting lens through second concave mirror that is all-trans, again successively be lens, detector and computing machine thereafter, described detector is a charge-coupled device CCD, is positioned on the focal length of lens.
Described LASER Light Source is the 5mW He-Ne laser instrument of a single transverse mode output.
Described beam expanding telescope is can be with the optical system of He-Ne laser beam enlarging bundle to Φ 50mm.
Described first, second semi-transparent semi-reflecting lens be a kind of to 6328 have 50% the reflection, 50% wedge that sees through.
Described first, second concave mirror that is all-trans is that a kind of being coated with 6328 total reflections, focal length is the plated film concave mirror of 50cm.
Described lens are that lump coke distance is the lens of 2.5cm, are used for and shrinkage cavity telescopic system of concave mirror composition.
Described detector is a charge-coupled device CCD, is used for recorded hologram.
Described computing machine is a machine that is used for hologram is carried out potential field reconstruct and demonstration.
The course of work of digital hologram double exposure phase difference amplifying device of the present invention roughly is:
Testing sample is placed in first semi-transparent semi-reflecting lens and first transmitted light path that is all-trans between the concave mirror, and this testing sample is a position phase sample to be studied, such as temperature field, ion plasma, optical flat, stress field or the like.
After LASER Light Source work, through beam expanding telescope beam expander is arrived Φ 50, through first semi-transparent semi-reflecting lens, its transmitted light beam becomes object beam through testing sample, through the reflection and the focusing of first concave mirror, the back is become reference beam by the first semi-transparent semi-reflecting lens beam reflected through the second concave reflection mirror reflection and focusing.Object beam and reference beam are noted down by CCD through the hologram of lens 7 shrinkage cavities after the second semi-transparent semi-reflecting mirror reflection and being seen through respectively again, have finished exposure for the first time.
After some physical change takes place testing sample 10, repeat said process and carry out the exposure second time.After these two hologram digitizings,, be multiplied by N doubly at phase factor again, just can obtain the phasic difference that N doubly amplifies, be presented on the screen of computing machine through Fourier transform, filtering, inverse transformation.
Digital hologram double exposure phase difference amplifying device of the present invention, compare with technology formerly, do not need that hologram is carried out repeatedly dark place and handle, high power ground amplifies phasic difference fast, and can overcome the various errors of repeatedly taking hologram and being brought, very wide application prospect is arranged.
Description of drawings:
Fig. 1 is present common holographic phase difference amplifying device synoptic diagram
Fig. 2 is a digital hologram double exposure phase difference amplifying device synoptic diagram of the present invention.
Embodiment
See also Fig. 2 earlier, Fig. 2 is a digital hologram double exposure phase difference amplifying device synoptic diagram of the present invention.As seen from the figure, digital hologram double exposure phase difference amplifying device of the present invention is made up of 9 parts: comprise LASER Light Source 1, the working direction of the laser beam of sending along LASER Light Source 1 has beam expanding telescope 2 successively, first semi-transparent semi-reflecting lens 3, the transmitted light direction of this first semi-transparent semi-reflecting lens 3 is through first concave mirror 4 to second semi-transparent semi-reflecting lens 6 that are all-trans, the reflected light direction of this first semi-transparent semi-reflecting lens 3 arrives second semi-transparent semi-reflecting lens 6 through second the be all-trans concave mirror 5, again successively be lens 7 thereafter, detector 8 and computing machine 9, described detector 8 is charge-coupled device CCD, is positioned on the focal length of lens 7.
The 5mW He-Ne laser instrument of single transverse mode output during said LASER Light Source 1.
Said beam expanding telescope 2 is can be with the optical system of He-Ne laser beam enlarging bundle to Φ 50mm.
Said first, second semi-transparent semi-reflecting lens 3,6th, a kind of have 50% reflectivity, see through 50% wedge 6328 .
Said first, second concave mirror 4,5th that is all-trans, a kind of focal length that is coated with 6328 completely reflecting mirrors is a 50cm plated film concave mirror.
Said lens 7 are that lump coke distance is the lens of 2.5cm, are used for and shrinkage cavity telescopic system of first, second concave mirror 4,5 compositions.
Said detector 8 is charge-coupled device CCD, is used for recorded hologram.
Said computing machine 9 is machines that are used for hologram is carried out potential field reconstruct and demonstration.
Said testing sample 10 is position phase samples to be studied, such as temperature field, ion plasma, optical flat, stress field or the like.
The course of work of apparatus of the present invention:
After LASER Light Source 1 work, after beam expanding telescope 2 arrives Φ 50 to beam expander, through first semi-transparent semi-reflecting lens 3, transmitted light beam incides testing sample 10 becomes object beam, through 4 reflections of first concave mirror and focusing, become reference beam through 5 reflections of second concave mirror and focusing by first semi-transparent semi-reflecting lens, 3 beam reflected.Object beam and reference beam are noted down by CCD8 through the hologram of lens 7 shrinkage cavities after 6 reflections of second semi-transparent semi-reflecting lens and being seen through respectively again, have finished exposure for the first time.
After some physical change takes place testing sample 10, repeat said process and carry out the exposure second time.After these two hologram digitizings,, be multiplied by N doubly at phase factor again, just can obtain the phasic difference that N doubly amplifies, be presented on the display device of computing machine 9 via Fourier transform, filtering, the inverse transformation of computing machine 9.
Claims (8)
1, a kind of digital hologram double exposure phase difference amplifying device, comprise LASER Light Source (1), the working direction that it is characterized in that the laser beam sent along LASER Light Source (1) has beam expanding telescope (2) successively, first semi-transparent semi-reflecting lens (3), the transmitted light direction of this first semi-transparent semi-reflecting lens (3) is all-trans concave mirror (4) to second semi-transparent semi-reflecting lens (6) through first, the reflected light direction of this first semi-transparent semi-reflecting lens (3) arrives second semi-transparent semi-reflecting lens (6) through second concave mirror (5) that is all-trans, again successively be lens (7) thereafter, detector (8) and computing machine (9), described detector (8) is a charge-coupled device CCD, is positioned on the focal length of lens (7).
2, digital hologram double exposure phase difference amplifying device according to claim 1 is characterized in that described LASER Light Source 1 is the 5mW He-Ne laser instrument of a single transverse mode output.
3, digital hologram double exposure phase difference amplifying device according to claim 1 is characterized in that described beam expanding telescope 2 is can be with the optical system of He-Ne laser beam enlarging bundle to Φ 50mm.
4, digital hologram according to claim 1 double exposure phase difference amplifying device is characterized in that described first, second semi-transparent semi-reflecting lens (3,6) is a kind of 6328 to be had 50% reflection, 50% wedge that sees through.
5, digital hologram double exposure phase difference amplifying device according to claim 1 is characterized in that described first, second concave mirror that is all-trans (4,5) is that a kind of being coated with 6328 total reflections, focal length is the plated film concave mirror of 50cm.
6, digital hologram double exposure phase difference amplifying device according to claim 1 is characterized in that described lens (7) are that lump coke distance is the lens of 2.5cm, are used for and shrinkage cavity telescopic system of first, second concave mirror (4,5) composition.
7, digital hologram according to claim 1 double exposure phase difference amplifying device is characterized in that described detector (8) is a charge-coupled device CCD, is used for recorded hologram.
8, digital hologram according to claim 1 double exposure phase difference amplifying device is characterized in that described computing machine (9) is a machine that is used for hologram is carried out potential field reconstruct and demonstration.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2003101084928A CN1542569A (en) | 2003-11-07 | 2003-11-07 | Digital holographic double-exposure phase difference amplifying device |
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| CNA2003101084928A CN1542569A (en) | 2003-11-07 | 2003-11-07 | Digital holographic double-exposure phase difference amplifying device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1313847C (en) * | 2005-09-28 | 2007-05-02 | 中国科学院上海光学精密机械研究所 | Holographic phase difference amplifying and reconstructing device based on Sagnac interferometer |
| CN100346645C (en) * | 2005-06-07 | 2007-10-31 | 哈尔滨工业大学 | Anaclasis variant holographic phase multiplexing storing and relative identifying method and system thereof |
| CN111338197A (en) * | 2018-12-19 | 2020-06-26 | 黑拉有限责任两合公司 | Apparatus and method for generating edge holograms |
| CN114397089A (en) * | 2021-11-03 | 2022-04-26 | 深圳技术大学 | Lens testing method based on wave surface interference information |
-
2003
- 2003-11-07 CN CNA2003101084928A patent/CN1542569A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100346645C (en) * | 2005-06-07 | 2007-10-31 | 哈尔滨工业大学 | Anaclasis variant holographic phase multiplexing storing and relative identifying method and system thereof |
| CN1313847C (en) * | 2005-09-28 | 2007-05-02 | 中国科学院上海光学精密机械研究所 | Holographic phase difference amplifying and reconstructing device based on Sagnac interferometer |
| CN111338197A (en) * | 2018-12-19 | 2020-06-26 | 黑拉有限责任两合公司 | Apparatus and method for generating edge holograms |
| CN114397089A (en) * | 2021-11-03 | 2022-04-26 | 深圳技术大学 | Lens testing method based on wave surface interference information |
| CN114397089B (en) * | 2021-11-03 | 2023-11-14 | 深圳技术大学 | Lens testing method based on wave surface interference information |
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