CN1124509C - Phased-array light scan method for array of unequivalent microlenses arranged regularly - Google Patents
Phased-array light scan method for array of unequivalent microlenses arranged regularly Download PDFInfo
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- CN1124509C CN1124509C CN 99123031 CN99123031A CN1124509C CN 1124509 C CN1124509 C CN 1124509C CN 99123031 CN99123031 CN 99123031 CN 99123031 A CN99123031 A CN 99123031A CN 1124509 C CN1124509 C CN 1124509C
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Abstract
The present invention belongs to the technical field of optics. The present invention relates to the improvement of a phased array light scan method of microlenses which are not regularly arranged. The present invention adopts microlens arrays which are regularly arranged and have equal focal length or unequal focal length, and a phase control unit. Compared with microlens arrays which are not regularly arranged and a phase control unit existing in the prior art, the present invention is easily realized on the technology, and the cost is low. Under the condition of different interference, light scan that only one interference maximal value exists, and no accompany light beam exists can be realized. The present invention provides a simple, convenient and feasible technical approach for practical application.
Description
Technical field: the invention belongs to optical technical field, relate to a kind of improvement to non-regularly arranged lenticule phased array light scan method.
Background technology: technology Chinese patent: CN1182220A formerly.The notion of phased array is meant is arranged according to certain rules by a lot of phase control unit and constitutes an array, all can reconcile the variation of the light refractive index of this unit simultaneously with electric signal to each unit, thereby make the light path of corresponding each unit of plane light wave (directional light) be subjected to different modulating by this an array.As Fig. 1, plane wave 1 converges to lenticule focus 6 by transparent common electrode 2, electro-optic crystal 3, phase control unit control transparency electrode 4, microlens array 5, forms multiple-beam interference wavelet source, can realize the interference of far field and near field.Want on space point or certain direction, to make that the light beam by each unit can both reach coordination phase each other, and produce multiple-beam interference, then only need of the phase compensation of each phase control unit of control, satisfy producing relevant maximum phase condition light wave.Usually, interfere maximumly in order to guarantee that phased array only produces on a set point or direction, and intensity approaches zero on other point or direction, between phase control unit must be apart from d less than half of the related electromagnetic wavelength of phased array.Because when phase control unit spacing during greater than wavelength, the optical path difference of consecutive point will be greater than wavelength on the different directions in 2 π spaces, and then it is maximum to produce a lot of interference, makes and interferes maximum not unique, and bias light is serious.
There are a plurality of interference maximums to occur simultaneously about phase control unit and unit interval d greater than related wavelength and don't generation, formerly technology has proposed two technology when addressing this problem: 1) introduce microlens array, 2) the lenticule spacing adopts non-regularly arranged in the microlens array.Microlens array is corresponding with each phase control unit, purpose is that the directional light 1 by each phase control unit is converged on the focus 6 of oneself separately, forms pointolite array, and the large scale of phase control unit is dwindled into a little, and interfere it to be output as wavefront 7 in the far field, see Fig. 1.Non-regularly arranged be for eliminating because the phase control unit spacing produces a plurality of maximum problems of appearance simultaneously of interfering greater than wavelength.Formerly technology is derived as long as the distance between each phase control unit or lenticule focus is not equal fully with the far field principle of interference, is non-regularly arranged, just can not produce a plurality of interference maximums simultaneously.From Fig. 1, can derive, work as d
1=d
2=d
3=...=d
mThe time, multistage order of interference can occur in the far field, and work as d
1≠ d
2≠ d
3≠ ... ≠ d
mThe time, and do not exist the relation of integral multiple, then only can produce one and interfere maximum in the far field.This is the non-regularly arranged method that draws according to the far field principle of interference of technology formerly.
Detailed content of the present invention: the objective of the invention is to solve formerly, technology adopts microlens array non-regularly arranged, make the high problem of making difficulty, cost of microlens array, the regularly arranged phased array optical scanning method of microlens array that provides a kind of technology to realize easily, reduce cost.
Detailed content of the present invention: adopt microlens array, be characterized in: when 1) interfering in the near field, at first make between centre distance between each phase control unit and corresponding each lenticule apart from di by equidistant arrangement and spacing greater than employed wavelength, each lenticular focal length equates, change the light refractive index of this unit by the voltage of regulating each phase control unit electrode 4, make the corresponding space of the whole light beams that pass through a bit produce same-phase, and make phase control unit all other spatial point beyond this point not produce same-phase simultaneously; When 2) interfering, adopt distance between each phase control unit and each lenticule by equidistant arrangement, but each lenticular focal length is unequal each other, when interfere in the far field in the wavelet source that these focuses constitute, can produces unique interference maximum in the far field.Specific as follows: as at first to investigate the near field and interfere, as d among Fig. 2
iBe the centre distance between phase control unit, i=1,2,3 ... m, m are the numbers of phase control unit.Though the distance in the phased array between phase control unit equates d
1=d
2=d
3=...=d
mBut for the different interference point in space, near field, make it a certain specified point generation in corresponding space homophase when regulating each phase control unit, be impossible have whole phase control unit all to produce the coordination phase simultaneously then, because can not differ used wavelength X integral multiple each other for all other light paths of putting each unit of corresponding phased array beyond the specified point at that to any spatial point beyond this point.As Fig. 3, under far field interference situation: each lenticule all is regularly arranged in the microlens array, i.e. the lenticule centreline space apart from d
iEquate, but each lenticular focal length is not wait each other in the microlens array.The microlens array of this regularly arranged not parfocal, under the interference condition of far field, to any direction in space, each lenticular focus optical path difference in far field toward each other is not satisfy wavelength integral multiple relation, therefore can not produce in any direction and interfere maximum, have only after the phased array modulation, could on assigned direction, produce unique interference principal maximum.
Be noted that as phase control unit spacing d
iDuring greater than employed wavelength, no matter be to adopt non-regularly arranged far field to interfere, still adopt regularly arranged near field to interfere, the light of all can having powerful connections exists, but it is compared with the interference point light intensity and differs greatly.
Embodiment:
Embodiments of the invention and dynamic duty process:
As Fig. 2, when needs make light by phased array in the interscan of a certain plane, can be to the control transparency electrode 4 parallel modulation signals that apply of phase control unit.These modulation signals are to act on electro-optic crystal 3 by control transparency electrode 4 and transparent common electrode 2, make it to produce the compensation light path, to satisfy all phase control unit are wavelength to the light path of the point of scanning integral multiple.The size of these modulation signals is that calculated in advance is good, and leaves in the storer.Concrete scanning process is as follows: when plane wave 1 converges to lenticule focus 6 formation wavelet sources by transparent common electrode 2, electro-optic crystal 3, phase control unit control transparency electrode 4, microlens array 5, the light path of these wavelet source relative scanning points modulated signals compensates, satisfy the integral multiple of wavelength all, promptly form and interfere maximum at analyzing spot 7, along with the arrival of next group modulation signal, plane wave 1 is just interfered at next analyzing spot 7.
Good effect of the present invention: the present invention adopts regularly arranged parfocal or parfocal little not Lens arra and phase control unit are than the microlens array of the formerly irregular arrangement of technology and phased The unit realizes easily that technically cost is low. Under different interference conditions, can realize equally Only have one to interfere maximum, and do not have the optical scanning of following light beam. The present invention provides practical application Simple and feasible technological approaches.
Description of drawings is as follows:
Fig. 1, formerly technical regulation phased array far field principle of interference sectional view;
Fig. 2, the present invention is regularly arranged, parfocal near field principle of interference sectional view;
Fig. 3, the present invention is regularly arranged, parfocal far field principle sectional view not.
Claims (1)
1, a kind of regularly arranged and non-parfocal microlens array phased array light scan method adopts microlens array, it is characterized in that: when 1) interfering in the near field, at first make between each lenticule of centre distance between each phase control unit and correspondence apart from d
iPress equidistantly arrangement and spacing greater than employed wavelength, each lenticular focal length equates, change the light refractive index of this unit by the voltage of regulating each phase control unit electrode, make the corresponding space of the whole light beams that pass through a bit produce same-phase, and make phase control unit all other spatial point beyond this point not produce same-phase simultaneously; When 2) interfering, adopt distance between each phase control unit and each lenticule by equidistant arrangement, but each lenticular focal length is unequal each other, when interfere in the far field in the wavelet source that these focuses constitute, produces unique interference maximum in the far field.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99123031 CN1124509C (en) | 1999-10-28 | 1999-10-28 | Phased-array light scan method for array of unequivalent microlenses arranged regularly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99123031 CN1124509C (en) | 1999-10-28 | 1999-10-28 | Phased-array light scan method for array of unequivalent microlenses arranged regularly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1294308A CN1294308A (en) | 2001-05-09 |
| CN1124509C true CN1124509C (en) | 2003-10-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99123031 Expired - Fee Related CN1124509C (en) | 1999-10-28 | 1999-10-28 | Phased-array light scan method for array of unequivalent microlenses arranged regularly |
Country Status (1)
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|---|---|
| CN (1) | CN1124509C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100365471C (en) * | 2004-09-30 | 2008-01-30 | 北京大学 | Optical phase array device |
| CN104062757B (en) * | 2014-06-30 | 2016-04-13 | 太原理工大学 | A kind of PHASE DISTRIBUTION method for designing for phased array multiple beam 3-D scanning |
| US10345093B2 (en) * | 2015-12-11 | 2019-07-09 | University Of Helsinki | Arrangement and method of determining properties of a surface and subsurface structures |
| WO2017135894A1 (en) * | 2016-02-01 | 2017-08-10 | Heptagon Micro Optics Pte. Ltd. | Illumination modules and optoelectronic systems |
| US10466496B2 (en) * | 2017-12-06 | 2019-11-05 | Facebook Technologies, Llc | Compact multi-color beam combiner using a geometric phase lens |
-
1999
- 1999-10-28 CN CN 99123031 patent/CN1124509C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1294308A (en) | 2001-05-09 |
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