CN106896546A - A kind of method for improving nematic liquid crystal optical modulation device diffraction efficiency - Google Patents
A kind of method for improving nematic liquid crystal optical modulation device diffraction efficiency Download PDFInfo
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- CN106896546A CN106896546A CN201710140201.5A CN201710140201A CN106896546A CN 106896546 A CN106896546 A CN 106896546A CN 201710140201 A CN201710140201 A CN 201710140201A CN 106896546 A CN106896546 A CN 106896546A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
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Abstract
The invention discloses a kind of method for improving nematic liquid crystal optical modulation device diffraction efficiency, comprise the following steps：Step one, Nematic phase liquid crystal material pours into LCD space light modulator part；Step 2, phase depth measuring system is built, carry out phase depth measurement, electric field is added to public electrode and pixel electrode layer two ends, records phase depth grey scale curve；Step 3, diffraction efficiency measuring system is built, carry out the measurement of light beam steering diffraction efficiency；Step 4, modulation optical modulation device, to its load-modulate gray-scale map, are modulated according to phase depth grey scale curve to it, form ideal refractive rate topography profile.A kind of method for improving nematic liquid crystal optical modulation device diffraction efficiency of the invention, can reach 6 π high phase place depth modulations, it is possible to increase nematic liquid crystal optical modulation device diffraction efficiency near infrared band, increase the largest beam deflection angle of optical modulation device.
Description
Technical field
The present invention relates to field of liquid crystals, more particularly to a kind of side for improving nematic liquid crystal optical modulation device diffraction efficiency
Method.
Background technology
All the time, diffraction optical device is used in each optical field, the spirit that liquid crystal light modulator is modulated due to it
Activity occupies increasingly consequence in programmable diffraction optics.In the parameters of liquid crystal light modulator, spread out
It is one of most important parameter of evaluation system performance to penetrate efficiency, and it is all the time the weight in each research work to improve diffraction efficiency
Want part.The method of nematic liquid crystal optical modulation device diffraction efficiency is improved at present mainly by excellent under 2 π phase depths
Change the modes such as phase distribution pattern, change device architecture, although have certain effect, but improve device complexity and
The very not big room for promotion of diffraction efficiency lifting aspect.Emulation and experiment show that high phase place depth modulation is conducive to improving
The diffraction efficiency of optical modulation device, and beam deflection angle degree is bigger, diffraction efficiency lifting effect is more obvious.In phase-only modulation
In device, based on principle of diffraction optics, 2 π phase depths are the phase depths of minimum achievable modulator phase-modulation function, and should
Phase depth be easiest to realize, the more difficult acquisition of high phase place depth ratio, this be due to the limitation of liquid crystal material self character, such as it is two-fold
Penetrate that rate is smaller, the operating voltage of liquid crystal is too high, and high phase place depth, the work of usual optical modulation device cannot be realized in low-voltage
Voltage if desired realizes high phase place depth modulation in below 5.5V, then need the liquid crystal material of big birefringence, high-k
Material.Due to the limitation of each side, the research of high phase place depth is less at present, but high phase place depth should on phase modulator
With there is apparent advantage, for example, the diffraction efficiency of phase modulator is being improved, increasing the achievable light of phase modulator
The aspects such as beam steering angle, thus realize that high phase place depth has very great meaning.
Therefore, those skilled in the art is devoted to developing a kind of raising nematic liquid crystal optical modulation device diffraction efficiency
Method, the method can reach 6 π high phase place depth modulations near infrared band, it is possible to increase nematic liquid crystal optical modulation device spreads out
Efficiency is penetrated, increases the largest beam deflection angle of optical modulation device.
The content of the invention
In view of the drawbacks described above of prior art, the technical problems to be solved by the invention are exploitations a kind of by high phase place
The method that depth modulation mode improves nematic liquid crystal optical modulation device diffraction efficiency, the method can reach 6 π near infrared band
High phase place depth modulation, it is possible to increase nematic liquid crystal optical modulation device diffraction efficiency, increases the largest beam of optical modulation device
Deflection angle.
To achieve the above object, the invention provides a kind of side for improving nematic liquid crystal optical modulation device diffraction efficiency
Method, comprises the following steps：
Step one, Nematic phase liquid crystal material pours into LCD space light modulator part；
Step 2, phase depth measuring system is built, carry out phase depth measurement, electric field is added to public electrode and pixel electricity
Pole layer two ends, record phase depth-grey scale curve；
Step 3, diffraction efficiency measuring system is built, carry out the measurement of light beam steering diffraction efficiency；
Step 4, modulation optical modulation device, to its load-modulate gray-scale map, enter according to phase depth-grey scale curve to it
Row modulation, forms ideal refractive rate topography profile.
Further, Nematic phase liquid crystal material is arranged to big refractive index, the liquid crystal material of big dielectric constant, liquid crystal material
It is at 1550 10 with the birefringence, dielectric constant value that value is 0.25.
Further, LCD space light modulator part is arranged to thickness for 12um.
Further, the modulation voltage of LCD space light modulator part is arranged to 0.5V-5.5V.
Further, phase depth measuring system includes tunable laser, Amici prism, speculum, light power meter and light
Modulator, light beam is sent from tunable laser, and light splitting is carried out into Amici prism, directly reaches phase-modulator surface, quilt
The light of phase-modulator surface emitting reaches light power meter by Amici prism.
Further, tunable laser is arranged near infrared band tunable laser, and wave-length coverage is arranged to
1525nm-1565nm。
Further, Amici prism can carry out light splitting near infrared band light, be divided into 45 ° of reflections and vertical incidence light
Beam.
Further, light power meter is arranged to the one kind near infrared band light power meter, laser optical power meter.
Further, optical modulator is arranged to liquid crystal on silicon spatial light modulator, and modulation can be powered up to liquid crystal.
Further, the computational methods of light beam steering diffraction efficiency measurement are arranged to the performance number of light beam after light beam steering
The ratio of the performance number before non deflected with light beam.
Technique effect
A kind of method for improving nematic liquid crystal optical modulation device diffraction efficiency of the invention is simple, by using big two-fold
Penetrate rate, the liquid crystal material of big dielectric constant realizes 6 π phase depths, the modulation contrast 2 π phase depths modulation of 6 π phase depths subtracts
The small quantity in region of turning back, can effectively lift diffraction efficiency, and especially diffraction efficiency lifting is obvious under wide-angle deflection.
The technique effect of design of the invention, concrete structure and generation is described further below with reference to accompanying drawing, with
It is fully understood from the purpose of the present invention, feature and effect.
Brief description of the drawings
Fig. 1 is a kind of side of raising nematic liquid crystal optical modulation device diffraction efficiency of a preferred embodiment of the invention
The π phase depths of preferable nematic liquid crystal 6 of method modulate -2 π phase depths modulation contrast schematic diagram.
Fig. 2 is a kind of side of raising nematic liquid crystal optical modulation device diffraction efficiency of a preferred embodiment of the invention
The π phase depths of nematic liquid crystal 6 of method modulate -2 π phase depths modulation topography profile comparison diagram.
Fig. 3 is a kind of side of raising nematic liquid crystal optical modulation device diffraction efficiency of a preferred embodiment of the invention
The phase depth measuring system schematic diagram of method.
Fig. 4 is a kind of side of raising nematic liquid crystal optical modulation device diffraction efficiency of a preferred embodiment of the invention
The diffraction efficiency measuring system figure of method.
Fig. 5 is a kind of side of raising nematic liquid crystal optical modulation device diffraction efficiency of a preferred embodiment of the invention
The diffraction efficiency measurement result of method.
Specific embodiment
A preferred embodiment of the invention provides a kind of method for improving nematic liquid crystal optical modulation device diffraction efficiency,
Comprise the following steps：
Step one, Nematic phase liquid crystal material pours into LCD space light modulator part；
Step 2, phase depth measuring system is built, carry out phase depth measurement, electric field is added to public electrode and pixel electricity
Pole layer two ends, record phase depth-grey scale curve；
Step 3, diffraction efficiency measuring system is built, carry out the measurement of light beam steering diffraction efficiency；
Step 4, modulation optical modulation device, to its load-modulate gray-scale map, enter according to phase depth-grey scale curve to it
Row modulation, forms ideal refractive rate topography profile.
As shown in figure 1, for the π phase depths of preferable nematic liquid crystal 6 modulate -2 π phase depths modulation contrast schematic diagram.
Black curve is 2 common π phase-modulations in figure, is modulation period 3 pixels are selected herein, and light grey curve is high phase place
The π adjustment curves of depth 6, modulation period is 9 pixels, and abscissa is the lateral attitude of modulator in figure, and ordinate is phase locating depth
Degree, unit is π.
As shown in Fig. 2 for the π phase depths of nematic liquid crystal 6 modulate -2 π phase depths modulation topography profile comparison diagram.Figure
Middle abscissa is the lateral attitude of modulator, and ordinate is phase depth, and unit is π.Black curve is 2 common π phases in figure
Position modulation, is modulation period 3 pixels are selected herein, and light grey curve is the π adjustment curves of high phase place depth 6, modulation period
It is 9 pixels.Actual emulation effect curve pattern is approached by target of preferable adjustment curve.There is part to fluctuate in curve
Section belongs to normal phenomenon, is caused because crystal molecule refractive index is discontinuously arranged.As can be seen from Figure, 6 π are adjusted under equal conditions
Much smaller than 2 π adjustment curves, the total length in region of turning back also is less than 2 π modulation to the region quantity that turns back in koji-making line, and 6 π are adjusted
The approach degree of koji-making line and ideal curve is higher than 2 π modulation, thus the diffraction efficiency of 6 π modulation can modulate higher than 2 π, Neng Gouyou
The diffraction efficiency of effect lifting optical modulation device.
As shown in figure 3, being phase depth measuring system schematic diagram of the present invention.As shown in figure 3,1 is LASER Light Source, in the reality
Near infrared band adjustable wavelength laser is used in example, wavelength band is 1525nm-1565nm, and 2 is Amici prism, and 3 are
Mirror surface, 4 is laser power meter, and 5 is phase-modulator, and light beam sends from laser, is divided into Amici prism 2
Light, the light beam through Amici prism 2 directly reaches the surface of phase-modulator 5, is phase-modulated the light of the reflection of device 5 by light splitting rib
Mirror 2 reflects, and reaches light power meter, and the light of the prism 2 that is split reflection reaches minute surface, and by mirror-reflection, light beam passes through light splitting rib
Mirror 2, reaches light power meter, is produced at light power meter test surface by the two-beam of the reflection of phase-modulator 5 and mirror-reflection
Interference, light beam produces phase offset, phase depth to change in light power meter by the modulation of phase-modulator 5 on phase-modulator 5
The interference luminous power obtained on test surface will change.Modulation is powered up to phase-modulator 5,5.5V is added to from 0V,
Each voltage one optical power value of correspondence.
As shown in figure 4, being diffraction efficiency measuring system figure.41 is LASER Light Source, and near-infrared is used in this example
Band wavelength tunable laser, wavelength band is 1525nm-1565nm, is exported through optical fiber connection collimater 42, by polarizer
Polarised light, light beam is produced to get in spatial light modulator 43, spatial light modulator 43 is modulated to light beam, light beam occurs inclined
Turn, optical modulator drives 44 one end connection panel 43, one end connects computer control end 45, and computer control end is carried out to optical modulator
Voltage modulated, is modulated by exporting grating gray-scale map to it, and deflected light beam is got on receiving screen 46, in receiving area
Light power meter can also be placed carries out measuring light power to it, the diffraction efficiency in the invention be power after light beam steering divided by
Power when non deflected.
As shown in figure 5, being diffraction efficiency measurement result of the invention.Be can be seen that by measurement result, 6 π phase depth diffraction
Efficiency will be modulated apparently higher than 2 π phase depths, and deflection angle is bigger, and it is more obvious that diffraction efficiency is improved.
By the present invention in that improve the diffraction efficiency of nematic liquid crystal optical modulation device with high phase place depth modulation, pass through
Using big birefringence, the liquid crystal material of big dielectric constant, and suitable thickness of liquid crystal box realizes the height of liquid crystal material
Phase depth, near infrared band is based on the π phase modulation depths of nematic liquid crystal phase modulator 6 under can realizing 5.5V voltages
Degree, can be applied on silicon-based liquid crystal device (LCOS), spatial light modulator (SLM) and other phase modulators, realize high
Diffraction efficiency.
Preferred embodiment of the invention described in detail above.It should be appreciated that one of ordinary skill in the art without
Need creative work just can make many modifications and variations with design of the invention.Therefore, all technologies in the art
Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Technical scheme, all should be in the protection domain being defined in the patent claims.
Claims (9)
1. it is a kind of improve nematic liquid crystal optical modulation device diffraction efficiency method, it is characterised in that comprise the following steps：
Step one, Nematic phase liquid crystal material pours into LCD space light modulator part；
Step 2, phase depth measuring system is built, carry out phase depth measurement, electric field is added to public electrode and pixel electrode layer
Two ends, record phase depth-grey scale curve；
Step 3, diffraction efficiency measuring system is built, carry out the measurement of light beam steering diffraction efficiency；
Step 4, modulation optical modulation device, to the optical modulation device load-modulate gray-scale map, write music according to phase depth-ash
Line is modulated to it, forms ideal refractive rate topography profile.
2. a kind of method for improving nematic liquid crystal optical modulation device diffraction efficiency as claimed in claim 1, it is characterised in that
The Nematic phase liquid crystal material is arranged to big refractive index, the liquid crystal material of big dielectric constant, and the liquid crystal material is in 1550nm
It is down 10 with the birefringence, dielectric constant value that value is 0.25.
3. a kind of method for improving nematic liquid crystal optical modulation device diffraction efficiency as claimed in claim 2, it is characterised in that
The modulation voltage of the LCD space light modulator part is arranged to 0.5V-5.5V.
4. a kind of method for improving nematic liquid crystal optical modulation device diffraction efficiency as claimed in claim 1, it is characterised in that
The phase depth measuring system include tunable laser, Amici prism, speculum, light power meter and optical modulator, light beam from
Sent in the tunable laser, light splitting is carried out into the Amici prism, phase-modulator surface is directly reached, by the phase
The light of position modulator surface transmitting reaches the light power meter by the Amici prism.
5. a kind of method for improving nematic liquid crystal optical modulation device diffraction efficiency as claimed in claim 4, it is characterised in that
The tunable laser is arranged near infrared band tunable laser, and wave-length coverage is arranged to 1525nm-1565nm.
6. a kind of method for improving nematic liquid crystal optical modulation device diffraction efficiency as claimed in claim 4, it is characterised in that
The Amici prism can carry out light splitting near infrared band light, be divided into 45 ° of reflections and normal incident light beam.
7. a kind of method for improving nematic liquid crystal optical modulation device diffraction efficiency as claimed in claim 4, it is characterised in that
The light power meter is arranged to the one kind near infrared band light power meter, laser optical power meter.
8. a kind of method for improving nematic liquid crystal optical modulation device diffraction efficiency as claimed in claim 4, it is characterised in that
The optical modulator is arranged to liquid crystal on silicon spatial light modulator, and modulation can be powered up to liquid crystal.
9. a kind of method for improving nematic liquid crystal optical modulation device diffraction efficiency as claimed in claim 1, it is characterised in that
The performance number that the computational methods of the smooth beam steering diffraction efficiency measurement are arranged to light beam after light beam steering is non deflected with light beam
The ratio of preceding performance number.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111630447A (en) * | 2018-03-12 | 2020-09-04 | Jvc建伍株式会社 | Liquid crystal element, phase modulation device, and method for controlling liquid crystal element |
| CN112202049A (en) * | 2020-09-30 | 2021-01-08 | 中国科学院半导体研究所 | Vertical cavity surface emitting laser based on liquid crystal regulation and control and preparation method thereof |
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| CN102109414A (en) * | 2010-12-15 | 2011-06-29 | 深圳大学 | Method and device for calibrating phase modulation of spatial light modulators by utilizing heterodyne interference |
| CN102692781A (en) * | 2012-06-18 | 2012-09-26 | 苏州大学 | Harmonic diffractive type liquid crystal zoom lens and array thereof |
| CN102866556A (en) * | 2012-09-29 | 2013-01-09 | 苏州大学 | Liquid crystal zoom lens and zoom control method thereof |
| US20150036084A1 (en) * | 2013-08-05 | 2015-02-05 | The Hong Kong University Of Science And Technology | Switchable liquid crystal fresnel lens |
| US20150078748A1 (en) * | 2013-09-18 | 2015-03-19 | Sumitomo Electric Industries, Ltd. | Wavelength selective switch |
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| CN102109414A (en) * | 2010-12-15 | 2011-06-29 | 深圳大学 | Method and device for calibrating phase modulation of spatial light modulators by utilizing heterodyne interference |
| CN102692781A (en) * | 2012-06-18 | 2012-09-26 | 苏州大学 | Harmonic diffractive type liquid crystal zoom lens and array thereof |
| CN102866556A (en) * | 2012-09-29 | 2013-01-09 | 苏州大学 | Liquid crystal zoom lens and zoom control method thereof |
| US20150036084A1 (en) * | 2013-08-05 | 2015-02-05 | The Hong Kong University Of Science And Technology | Switchable liquid crystal fresnel lens |
| US20150078748A1 (en) * | 2013-09-18 | 2015-03-19 | Sumitomo Electric Industries, Ltd. | Wavelength selective switch |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111630447A (en) * | 2018-03-12 | 2020-09-04 | Jvc建伍株式会社 | Liquid crystal element, phase modulation device, and method for controlling liquid crystal element |
| CN111630447B (en) * | 2018-03-12 | 2023-09-19 | Jvc建伍株式会社 | Liquid crystal element, phase modulation device, and method for controlling liquid crystal element |
| CN112202049A (en) * | 2020-09-30 | 2021-01-08 | 中国科学院半导体研究所 | Vertical cavity surface emitting laser based on liquid crystal regulation and control and preparation method thereof |
| CN112202049B (en) * | 2020-09-30 | 2022-08-30 | 中国科学院半导体研究所 | Vertical cavity surface emitting laser based on liquid crystal regulation and control and preparation method thereof |
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