CN104007553A - Method for expanding effective diffraction field of diffraction optical beam shaping device - Google Patents
Method for expanding effective diffraction field of diffraction optical beam shaping device Download PDFInfo
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- CN104007553A CN104007553A CN201410219031.6A CN201410219031A CN104007553A CN 104007553 A CN104007553 A CN 104007553A CN 201410219031 A CN201410219031 A CN 201410219031A CN 104007553 A CN104007553 A CN 104007553A
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Abstract
The invention discloses a method for expanding the effective diffraction field of a diffraction optical beam shaping device, and belongs to the field of optical devices. The diffraction optical beam shaping device can be composed of diffraction optical elements and a convex lens or diffraction optical elements and a concave lens. The diffraction optical elements and the lens can be manufactured into independent parts or the diffraction optical elements can be directly manufactured on a flat surface or a curved surface of the convex lens. Then, the focal length of the lens is designed according to the diffraction distance, the size of the diffraction optical elements and the required effective diffraction field size. Furthermore, phase distribution of the diffraction optical elements is designed according to the expected diffraction field light intensity distribution, the focal length of the lens, the diffraction distance and the sampling interval of the diffraction optical elements. The method has the advantages that the effectively diffraction field is expanded, and meanwhile, a better beam shaping effect can also be obtained; optical filed phase modulation and/or amplitude modulation are/is realized; the device can be used in the fields such as laser manufacturing, holographic two-dimensional/three-dimensional display, games and entertainment.
Description
Technical field
The invention belongs to optical device field, be particularly related to a kind of method that expands the effective diffractional field of diffraction optics beam shaping device, be the beam shaping device utilizing based on diffraction principle specifically, when expanding effective diffractional field, also can obtain good beam shaping effect.
Background technology
In fields such as laser manufacture, holographic two-dimensional/three-dimensional demonstration, game, amusements, conventionally need specific two-dimensional/three-dimensional optical field distribution, such as even dot matrix, non-homogeneous dot matrix, the distribution of flat-top super-Gaussian etc.These distributions can be realized by beam shaping device or system, and wherein the beam shaping device based on diffraction principle, comprises that binary optical device, holographic optical elements (HOE) etc. are the effective means that realizes these distributions.Effective diffractional field size of diffraction optics beam shaping device (take one dimension as example) is L
z=λ z/ Δ x
0, wherein z is diffraction distance, Δ x
0for the sampling interval of diffraction optical element, λ is wavelength, L
zfor effective diffractional field size.Along with the reducing of the increase of diffraction distance z, diffraction optical element sampling interval, wavelength increase, effectively diffractional field also increases thereupon.But in order to reduce the volume of beam shaping system, need to when same diffraction distance and wavelength, obtain the effective diffractional field expanding, traditional way can only be to reduce diffraction optical element sampling interval, but limited by processing technology, and the sampling interval of diffraction optical element can not be too little.Now, only adopt traditional beam shaping device or system can not meet the demands, therefore, study a kind of under identical diffraction optical element sampling interval, diffraction distance, wavelength situation, the method of the effective diffractional field of expanded light beam shaping device, has very large realistic meaning in actual applications.In prior art, also there is no at present related art scheme.
Summary of the invention
The object of this invention is to provide a kind of method that expands the effective diffractional field of diffraction optics beam shaping device, it is characterized in that, described diffraction optics beam shaping device composition comprises by diffraction optical element and convex lens and forms and form two schemes by diffraction optical element and concavees lens;
A kind of diffraction optics beam shaping device being formed by diffraction optical element and convex lens, wherein, be that diffraction optical element and convex lens are made independent parts, another kind is directly diffraction optical element to be fabricated on a side surface of convex lens, on plane or curved surface, all can; Then according to diffraction distance and diffraction optical element size and the effective diffractional field size design focal length of lens needing; Again according to the diffractional field light distribution of expectation and the focal length of lens, diffraction distance and diffraction optical element sampling interval design diffraction optical element PHASE DISTRIBUTION, thereby obtain the shaping light beam having expanded;
The diffraction optics beam shaping device that another kind is comprised of diffraction optical element and concavees lens, wherein, be that diffraction optical element and concavees lens are made independent parts, another kind is directly diffraction optical element to be fabricated on a side surface of convex lens, on plane or curved surface, all can; Then according to diffraction distance and diffraction optical element size and the effective diffractional field size design focal length of lens needing; Again according to the diffractional field light distribution of expectation and the focal length of lens, diffraction distance and diffraction optical element sampling interval design diffraction optical element PHASE DISTRIBUTION, thereby obtain the shaping light beam having expanded;
If the focal length of lens is f, for convex lens, f≤zL
0/ (L
z+ L
0), for concavees lens, f≤zL
0/ (L
z-L
0).
The focal length of the convex lens described in effective diffractional field size correspondence of described diffraction distance and needs, in a certain diffraction distance, the focal length of lens is shorter, and effectively diffractional field size is larger; The diffraction optical element PHASE DISTRIBUTION corresponding to diffractional field light distribution of different expectations.
Concave Mirrors Focus described in effective diffractional field size correspondence of described diffraction distance and needs, in a certain diffraction distance, the focal length of lens is shorter, and effectively diffractional field size is larger; The diffraction optical element PHASE DISTRIBUTION corresponding to diffractional field light distribution of different expectations.
Described diffraction optical element is binary optical elements, holographic optical elements (HOE), micronano optical element or spatial light modulator, to realize the modulation of light field phase-modulation and/or amplitude;
The invention has the beneficial effects as follows in the method and can make, in identical diffraction distance, to have expanded effective diffractional field, thereby can effectively reduce beam shaping system dimension, or can show at closer distance place larger diffraction pattern.This beam shaping device can be used for the fields such as laser manufacture, holographic two-dimensional/three-dimensional demonstration, game, amusement.
Accompanying drawing explanation
Fig. 1 is that diffraction optical element size Lz and z are related to schematic diagram;
Fig. 2 is the beam shaping device schematic diagram that diffraction optical element adds convex lens structures;
Fig. 3 is the beam shaping device schematic diagram that diffraction optical element adds concavees lens structure;
Fig. 4 is the shaping hot spot 1 of expectation;
Fig. 5 adds the PHASE DISTRIBUTION figure that will optimize when 800mm place acquisition 170mm shaping hot spot 1 in convex lens situation;
Fig. 6 is the shaping hot spot 2 of expectation;
Fig. 7 adds the PHASE DISTRIBUTION figure that will optimize when 800mm place acquisition 146mm shaping hot spot 2 in concavees lens situation;
Fig. 8 is design output schematic diagram;
Embodiment
The invention provides a kind of method that expands the effective diffractional field of diffraction optics beam shaping device, below in conjunction with accompanying drawing and way of example, the present invention is described in further detail, it should be understood that below the only object for explaining of example, but not limit the invention.
In Fig. 1,2,3, described diffraction optics beam shaping device composition comprises by diffraction optical element and convex lens and forms and form two schemes by diffraction optical element and concavees lens;
(1) according to diffraction distance and diffraction optical element size, the parameter designing focal length of lens f such as effective diffractional field size that need, for convex lens, f≤zL
0/ (L
z+ L
0), for concavees lens, f≤zL
0/ (L
z-L
0).L wherein
0for diffraction optical element size.
(2) according to parameters such as the diffractional field light distribution of expectation and the focal length of lens, diffraction distances, design diffraction optical element PHASE DISTRIBUTION.
(3) diffraction optical element that the processing lens of respective focal and respective phase distribute, or directly diffraction optical element is fabricated on a side surface (plane or curved surface all can) of the lens with respective focal.In addition, the PHASE DISTRIBUTION of diffraction optical element also can be produced by spatial light modulator.
Embodiment 1: diffraction optical element adds the beam shaping device of convex lens structures
Diffraction optical element parameter is: sampling interval Δ x
0=Δ y
0=8 μ m, hits N
x=N
y=1080, wavelength X=632.8nm.Need to apart from 800mm place, obtain full-size 170mm, shaping hot spot 1 as shown in Figure 4 at diffraction.According to L
z=λ z/ Δ x
0, effectively diffractional field full-size is 63.28mm, cannot meet the demands.And adopt our rule to realize.The focal length of convex lens calculating is 38.7mm to the maximum, and the focal length of convex lens that this example adopts is also 38.7mm, and the PHASE DISTRIBUTION that design obtains as shown in Figure 5.
Embodiment 2: diffraction optical element adds the beam shaping device of concavees lens structure
Diffraction optical element parameter and laser wavelength are with embodiment 1.To obtain at 800mm place full-size 146mm, shaping hot spot 2 as shown in Figure 6.The result of calculation of concavees lens maximum focal length is 50.3mm, and the position phase distribution plan that design obtains as shown in Figure 7.
Fig. 8 is design output schematic diagram.
Claims (4)
1. a method that expands the effective diffractional field of diffraction optics beam shaping device, is characterized in that, described diffraction optics beam shaping device composition comprises by diffraction optical element and convex lens and forms and form two schemes by diffraction optical element and concavees lens;
A kind of diffraction optics beam shaping device being formed by diffraction optical element and convex lens, wherein, be that diffraction optical element and convex lens are made independent parts, another kind is directly diffraction optical element to be fabricated on a side surface of convex lens, on plane or curved surface, all can; Then according to diffraction distance and diffraction optical element size and the effective diffractional field size design focal length of lens needing; Again according to the diffractional field light distribution of expectation and the focal length of lens, diffraction distance and diffraction optical element sampling interval design diffraction optical element PHASE DISTRIBUTION, thereby obtain the shaping light beam having expanded;
The diffraction optics beam shaping device that another kind is comprised of diffraction optical element and concavees lens, wherein, be that diffraction optical element and concavees lens are made independent parts, another kind is directly diffraction optical element to be fabricated on a side surface of convex lens, on plane or curved surface, all can; Then according to diffraction distance and diffraction optical element size and the effective diffractional field size design focal length of lens needing; Again according to the diffractional field light distribution of expectation and the focal length of lens, diffraction distance and diffraction optical element sampling interval design diffraction optical element PHASE DISTRIBUTION, thereby obtain the shaping light beam having expanded;
If the focal length of lens is f, for convex lens, f≤zL
0/ (L
z+ L
0), for concavees lens, f≤zL
0/ (L
z-L
0).L wherein
0for diffraction optical element size; L
zfor effective diffractional field size.
2. a kind of method that expands the effective diffractional field of diffraction optics beam shaping device according to claim 1, it is characterized in that, the focal length of the convex lens described in effective diffractional field size correspondence of described diffraction distance and needs, in a certain diffraction distance, the focal length of lens is shorter, and effectively diffractional field size is larger; The diffraction optical element PHASE DISTRIBUTION corresponding to diffractional field light distribution of different expectations.
3. a kind of method that expands the effective diffractional field of diffraction optics beam shaping device according to claim 1, it is characterized in that, Concave Mirrors Focus described in effective diffractional field size correspondence of described diffraction distance and needs, in a certain diffraction distance, the focal length of lens is shorter, and effectively diffractional field size is larger; The diffraction optical element PHASE DISTRIBUTION corresponding to diffractional field light distribution of different expectations.
4. a kind of method that expands the effective diffractional field of diffraction optics beam shaping device according to claim 1, it is characterized in that, described diffraction optical element is binary optical elements, holographic optical elements (HOE), micronano optical element or spatial light modulator, to realize the modulation of light field phase-modulation and/or amplitude.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105866946A (en) * | 2016-06-02 | 2016-08-17 | 清华大学 | Design method of white light LED diffraction optical device |
| CN105911703A (en) * | 2016-06-24 | 2016-08-31 | 上海图漾信息科技有限公司 | Linear laser projection device and method, and laser ranging device and method |
| CN107045256A (en) * | 2017-03-17 | 2017-08-15 | 成都九天光学技术有限公司 | A kind of new pattern laser projecting illumination system |
| CN113703166A (en) * | 2021-07-30 | 2021-11-26 | 的卢技术有限公司 | AR-HUD method and system through diffraction holographic imaging |
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| JP2007073364A (en) * | 2005-09-07 | 2007-03-22 | Victor Co Of Japan Ltd | Backlight device |
| CN103199139A (en) * | 2013-01-31 | 2013-07-10 | 中国科学技术大学 | Spectral diffraction optical system used for solar energy condensation |
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2014
- 2014-05-22 CN CN201410219031.6A patent/CN104007553B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007073364A (en) * | 2005-09-07 | 2007-03-22 | Victor Co Of Japan Ltd | Backlight device |
| CN103199139A (en) * | 2013-01-31 | 2013-07-10 | 中国科学技术大学 | Spectral diffraction optical system used for solar energy condensation |
Non-Patent Citations (1)
| Title |
|---|
| 李凤友 等: "激光直写***焦斑整形的研究", 《光学 精密工程》, vol. 9, no. 1, 28 February 2001 (2001-02-28), pages 14 - 18 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105866946A (en) * | 2016-06-02 | 2016-08-17 | 清华大学 | Design method of white light LED diffraction optical device |
| CN105866946B (en) * | 2016-06-02 | 2018-04-10 | 清华大学 | A kind of design method of white light LEDs diffraction optical device |
| CN105911703A (en) * | 2016-06-24 | 2016-08-31 | 上海图漾信息科技有限公司 | Linear laser projection device and method, and laser ranging device and method |
| CN107045256A (en) * | 2017-03-17 | 2017-08-15 | 成都九天光学技术有限公司 | A kind of new pattern laser projecting illumination system |
| CN113703166A (en) * | 2021-07-30 | 2021-11-26 | 的卢技术有限公司 | AR-HUD method and system through diffraction holographic imaging |
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| CN104007553B (en) | 2016-08-24 |
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