CN104614867A - Optical rotor and device and method for inhibiting laser speckle based on optical rotor - Google Patents
Optical rotor and device and method for inhibiting laser speckle based on optical rotor Download PDFInfo
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- 230000010287 polarization Effects 0.000 claims description 170
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/48—Laser speckle optics
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
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Abstract
The embodiment of the invention discloses an optical rotor and device and method for inhibiting laser speckle based on the optical rotor. The device comprises a linear polarized light generator, an optical rotor, a modulating power supply and an imaging display system; the linear polarized light generator is used for generating linear polarized light; the optical rotor connects the linear polarized light generator with the modulating power supply; the optical rotor can be driven by the magnetism generated by modulating pulse pressure of the modulating power supply to rotate the linear polarized light sent by the linear polarized light generator in the polarizing direction, so as to obtain output linear polarized light which is orthogonal to the inputted linear polarized light; the modulating power supply is connected with the optical rotor and used for providing the modulating pulse pressure to the optical rotor; the imaging display system is used for projecting and displaying the linear polarized light outputted by the optical rotor. According to the technical scheme, the device has the advantages of being simple in structure, flexible and convenient to modulate, and wide in applicable scope; the device can be used in match with other speckle removing technologies so as to achieve a good speckle inhibiting and dispersing effect.
Description
the divisional application of the Chinese invention patent application 201080067728.6 that to be 2010 09 month 03 denomination of invention everyday proposed be the application " polarization apparatus and based on the laser speckle suppression device of polarization apparatus and method ".
Technical field
The present invention relates to technical field of laser display, particularly a kind of polarization apparatus and based on the laser speckle suppression device of polarization apparatus and method.
Background technology
Laser display is considered to display technique of future generation, has wide market outlook.Laser display technology, compared with other display technique, has and can realize the advantages such as large colour gamut shows, color saturation is high, low in energy consumption.But, because laser has high coherence, when laser beam is after the scattering of projection screen in projection display optical system, produce in space and interfere speckle, be called speckle.Speckle is inevitable a kind of noise in laser display, is affect the maximum factor of image quality, can give the sensation of beholder's discomfort, so suppress Speckles Technique to be an indispensable link in laser display product.
Human eye can be weighed by this parameter of speckle contrast the impression of speckle.The sensation of the larger then human eye of speckle contrast to speckle is more obvious, and the subjective feeling for display effect is poorer; Otherwise speckle contrast is less, then human eye can weaken the sensation of speckle, and the subjective feeling for display effect is better.The definition of speckle contrast C is: the mean value of standard deviation/all pixel light intensity of C=all pixels light intensity.
In the same industry, many researchers once proposed to suppress a lot of methods of speckle, as mobile scatterer, vibrated screen, utilize the light source of different wave length, utilized the methods such as the superposition of pulse laser to suppress speckle.Method as the screen of vibration exactly of the laser television of MIT suppresses speckle, its screen does overall circular motion with certain linear velocity, when amount of exercise is enough large, the motion of screen creates similar speckle movement, with the change of the speckle pattern that eyes intercept, its net effect is exactly " boiling " of so-called speckle, the time integral of the speckle of boiling makes speckle contrast decline, due to human eye integrating effect, observe speckle and obtain certain suppression, the granular sensation of picture can be weakened largely.
After utilizing other speckle suppression technology, the diversity of polarization can also be utilized to suppress speckle further.The diversity of polarization refers to, the polarized light that laser produces has variform, and as linearly polarized light, circularly polarized light and elliptically polarized light etc., the polarized light form that laser crystal produces is random.
In theory, polarization diversity is adopted to suppress speckle that speckle contrast can be made at most to reduce by 1/2.Prior art utilizes the diversity of polarization to suppress speckle, and its scheme mainly suppresses speckle by the optical superposition of a large amount of random polarization state, due to the randomness of polarization state, is difficult to realize speckle contrast and reduces by 1/2.Further, prior art utilizes polarization diversity need add more polarization optics to suppress the scheme of speckle, and its optical efficiency is not high and light path is slightly aobvious complicated.
In following document, can also find more information relevant to technique scheme: [1] Joseph W.Goodman, the speckle phenomena-theory in optics and application, Cao Qizhi etc. translate, Beijing: Science Press, and 2009; [2] application number is the Chinese invention patent application file of 200910111106.8; [3] application number is the Chinese invention patent application file of 200910176017.1; [4] application number is the Chinese invention patent application file of 200910131359.1.
Summary of the invention
For the defect of prior art, the embodiment of the present invention proposes a kind of polarization apparatus and based on the laser speckle suppression device of polarization apparatus and method, the technical scheme of the embodiment of the present invention utilizes the polarization apparatus of magnetic control to carry out controlled rotation to the polarization angle of linearly polarized light, the linearly polarized light that polarization apparatus is exported and the orthogonal thereto characteristic of the linearly polarized light of input, this technical scheme not only structure is simple, and can realize speckle contrast reduction by 1/2.
On the one hand, in one embodiment, provide a kind of polarization apparatus, connect modulation power source; Described polarization apparatus receives linearly polarized light; Under the magnetically-actuated providing modulating pulse voltage to produce for described polarization apparatus at modulation power source, the polarization direction of described linearly polarized light is rotated, obtains the polarization light output orthogonal with the linearly polarized light inputted.
On the other hand, in one embodiment, provide a kind of laser speckle suppression device, described device comprises: linearly polarized light generator, for generation of linearly polarized light; Polarization apparatus, be made up of the optical active substance making linearly polarized light polarization direction rotate, connect described linearly polarized light generator, the polarization direction of the linearly polarized light transmitted by described linearly polarized light generator rotates, with the polarization light output that the linearly polarized light obtained with input is orthogonal; Imaging display system, for the linearly polarized light Projection Display exported by described polarization apparatus.
Another aspect, in another embodiment, provide a kind of laser speckle suppressing method, described method comprises: produce linearly polarized light; Be provided as the modulating pulse voltage needed for the rotation of described linearly polarized light; Under the magnetically-actuated that described modulating pulse voltage produces, polarization apparatus is adopted to be rotated the polarization direction of described linearly polarized light, with the polarization light output that the linearly polarized light obtained with input is orthogonal; The linearly polarized light that polarization apparatus exports is carried out projection imaging process and shows.
The technical scheme of the embodiment of the present invention, what utilize is that the diversity of polarisation of light is to suppress speckle, particularly, this technical scheme adopts the polarization direction of polarization apparatus to linearly polarized light to rotate, the linearly polarized light that polarization apparatus is exported and the orthogonal thereto characteristic of the linearly polarized light of input; The speckle pattern that the speckle pattern produced without the linearly polarized light rotated and postrotational orhtogonal linear polarizaiton light produce is superposed within the integral time of human eye, makes speckle contrast reduce half.The technical scheme of the embodiment of the present invention and other such as vibrate screen, increase live width, angle diversity, the Speckles Technique that disappears such as mobile scatterer is compared, there is the advantages such as structure is simple, modulation is flexible, applied range, can with other disappear Speckles Technique with the use of, thus reach the effect better suppressing speckle.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.In the accompanying drawings:
Fig. 1 is the polarization apparatus fundamental diagram being used as optoisolator;
Fig. 2 is the polarization apparatus fundamental diagram of the embodiment of the present invention;
Fig. 3 is the modulation power source 104 of embodiment of the present invention when being in low level, the input and output schematic diagram of polarization apparatus;
Fig. 4 is the modulation power source 104 of embodiment of the present invention when being in high level, the input and output schematic diagram of polarization apparatus;
Fig. 5 is one of schematic diagram of device of the embodiment of the present invention;
Fig. 5 a is the schematic diagram of device two of the embodiment of the present invention;
Fig. 6 is the schematic diagram of device three of the embodiment of the present invention;
Fig. 7 is the schematic diagram of device four of the embodiment of the present invention;
The technical scheme that Fig. 8 is the embodiment of the present invention and the speckle that prior art realizes suppress situation comparison diagram;
Fig. 9 is the laser speckle suppressing method process flow diagram of the embodiment of the present invention
Figure 10 be existing vibration screen disappear Speckles Technique and the embodiment of the present invention dissipation spot combine with technique application schematic diagram.
Embodiment
The embodiment of the present invention proposes a kind of polarization apparatus and based on the laser speckle suppression device of polarization apparatus and method, this technical scheme utilizes the diversity of polarized light to suppress speckle.Particularly, this technical scheme adopts the polarization direction of polarization apparatus to linearly polarized light to rotate, and the linearly polarized light before making postrotational linearly polarized light and rotating is orthogonal; The speckle pattern that the speckle pattern produce the linearly polarized light before rotating and postrotational linearly polarized light produce superposes within the integral time of human eye, makes speckle obtain effective suppression.
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
When linearly polarized light is subject to coarse surface (as screen) scattering, speckle contrast is provided by following formula
（1）
Wherein: P is scatter light polarization degree, and being nonpolarized light during 0≤P≤1(P=0, is linearly polarized light during P=1).Because linearly polarized light understands depolarization (becoming scattered light), so P generally can think equal 0 by after coarse face (as screen) scattering.Therefore, linearly polarized light is by after coarse face (as screen) scattering, and speckle contrast can be down to original 1/
, the speckle now observed has weakening to a certain degree.
Because linearly polarized light depolarization can become scattered light by after coarse face (as screen) scattering, and scattered light (nonpolarized light) be equivalent to two orhtogonal linear polarizaiton light components and, its produces two equal strength and independently speckle pattern, and now speckle contrast drops to 1/
; If the polarization direction of the linearly polarized light of incidence have rotated 90 degree within human eye integral time, the scattered light of this postrotational linearly polarized light by becoming after coarse face (as screen) scattering, equally also can produce two equal strength and independently speckle pattern, add two speckle pattern that undeflected linearly polarized light produces, so will produce 4 independently speckle pattern within the integral time of human eye, at this moment speckle contrast can drop to (1/
) * (1/
)=1/2.
The method and apparatus of the embodiment of the present invention make use of above-mentioned principle to design just.First the realization of the embodiment of the present invention needs to select a kind of equipment that can rotate the polarization direction of linearly polarized light, and the embodiment of the present invention is by realizing rotating the polarization direction of linearly polarized light by the polarization apparatus of Magnetic Control.The material that linearly polarized light polarization direction can be made to rotate is called optical active substance, and polarization apparatus is made up of the material that can realize rotation effect.
The principle of rotation effect is: when linearly polarized light is propagated by some crystal, its plane of oscillation can turn over an angle in relatively former direction.The advantage of this rotation effect is, does not need the effect of externally-applied magnetic field just can realize optically-active; Its shortcoming is, the angle that the polarization direction of linearly polarized light rotates is uncontrollable.
The principle of another kind of rotation effect is: under the influence of a magnetic field, and originally the active material of tool does not create optical activity yet, and the angle of its optically-active accurately can control according to the size in magnetic field.The mode of the additional modulation power source of general employing produces magnetic field, when modulation power source is in low level, does not produce rotation effect; When modulation power source is in high level, can applies to this material the voltage corresponding to the polarized light anglec of rotation, make polarized light rotate corresponding angle.Voltage as corresponded to polarization direction 90-degree rotation is called λ/2 voltage, and the voltage revolving turnback corresponding to polarization direction is called λ voltage, and wherein λ is the wavelength of polarized light.The linearly polarized light anglec of rotation based on the magnetic control polarization apparatus of power modulation is controlled, and therefore the application of this polarization apparatus is more extensive, and Given this, hereafter described polarization apparatus is all the magnetic control polarization apparatus based on power modulation.
A kind of common application of polarization apparatus plays light isolation in the optical path, also, light only propagated along a direction, can not drive in the wrong direction.The principle of work of this polarization apparatus as optoisolator as shown in Figure 1, wherein the polarization axle of polaroid 103 and 104 is mutually 45° angle, modulation power source 102 gives polarization apparatus 101 with the modulation signal of λ/4 of specific direction, when the light signal by polaroid 103 is after polarization apparatus 101, its polarization direction is consistent with the polarization axle of polaroid 104, and this optical signal can be straightway by polaroid 104; On the contrary, if light is from returning in the other direction, because polarization apparatus 101 and optical propagation direction have nothing to do, so after polaroid 104 and polarization apparatus 101, its polarization direction will be vertical with the polarization axle of polaroid 103, thus be not reflected light path by polaroid 103, so just serve the object of isolation backlight.
Different with the polarization apparatus of this main flow, the embodiment of the present invention provides a kind of polarization apparatus, and this polarization apparatus is used for suppressing laser speckle.Particularly, the embodiment of the present invention utilizes the high level voltage of modulation power source to modulate polarization apparatus, utilize the optically-active characteristic of polarization apparatus that the polarization direction of linearly polarized light is rotated, the polarization direction of the linearly polarized light before making the direction of postrotational linearly polarized light and rotating presents orthogonal property; Utilize the modulated pulse signal time interval of modulation power source to modulate polarization apparatus, make this modulating pulse time interval be less than human eye integral time.Now, according to the principle of above-mentioned speckle contrast, speckle contrast can fall 1/2, thus speckle obtains further suppression.
The polarization apparatus fundamental diagram that Fig. 2 provides for the embodiment of the present invention.As shown in Figure 2, the polarization apparatus 201 of the embodiment of the present invention, connects modulation power source 202; This polarization apparatus 201 receives linearly polarized light; Under the magnetically-actuated providing modulating pulse voltage to produce for this polarization apparatus 201 at modulation power source 202, the polarization direction of linearly polarized light is rotated, obtains the polarization light output orthogonal with the linearly polarized light inputted.
Alternatively, when modulation power source 202 is in low level, polarization apparatus 201 does not rotate the polarization direction of the linearly polarized light of input; When modulation power source 202 is in high level, the polarization direction of the linearly polarized light of input rotates by polarization apparatus 201, with the polarization light output that the linearly polarized light obtained with input is orthogonal.
Fig. 3 is modulation power source 202 when being in low level, the input and output schematic diagram of polarization apparatus 201; As can be seen from Figure 3, the polarization direction of linearly polarized light does not change.Fig. 4 is modulation power source 202 when being in high level, and the input and output schematic diagram of polarization apparatus 201, as can be seen from Figure 4, the polarization direction of polarization light output is orthogonal with the polarization direction of input line polarized light.
Alternatively, in the embodiment of the present invention, the magnitude of voltage of the modulating pulse voltage of modulation power source 202 corresponds to the angle that linearly polarized light rotates, as when magnitude of voltage be λ/2, the direction 90-degree rotation of polarization light output, this magnitude of voltage can also be other magnitudes of voltage that constrained input linearly polarized light can be caused orthogonal; The modulating pulse time of the modulating pulse voltage of the embodiment of the present invention is greater than the coherence time of linearly polarized light, is less than human eye integral time.
The polarization apparatus 201 of the embodiment of the present invention, compared with the polarization apparatus 101 of routine, has following characteristics and beneficial effect: 1, do not need the auxiliary of polaroid 103 and polaroid 104, as long as the light inciding magneto-optical crystal is linearly polarized light; 2, modulation power source 102 provides the continuous signal of λ/4 to polarization apparatus 101, and the modulation power source 202 of the embodiment of the present invention provides the pulse signal of λ/2 to polarization apparatus 201; 3, conventional polarization apparatus 101 generally plays light buffer action, and the embodiment of the present invention utilizes polarization apparatus 201 to produce two between coherence time and human eye integral time to restraint mutually orthogonal linearly polarized light, thus suppression laser speckle.
The embodiment of the present invention also provides a laser speckle suppression device, and this device contains polarization apparatus 201 described by previous embodiment and modulation power source 202.Fig. 5 is the schematic diagram of device of the embodiment of the present invention.As shown in Figure 5, the laser speckle suppression device of the embodiment of the present invention comprises: linearly polarized light generator 501, for generation of linearly polarized light; Polarization apparatus 201, connecting line polarized light generator 501 and a modulation power source 202, for under the magnetically-actuated that produces at the modulating pulse voltage of modulation power source 202, the polarization direction of the linearly polarized light transmitted by linearly polarized light generator 501 rotates, with the polarization light output that the linearly polarized light obtained with input is orthogonal; Modulation power source 202, connects polarization apparatus 201, for providing modulating pulse voltage for polarization apparatus 201; Imaging display system 502, for the linearly polarized light Projection Display exported by polarization apparatus 201.
Fig. 5 a is a refinement schematic diagram of Fig. 5.As shown in Figure 5 a, particularly, imaging display system 502 comprises: projection imaging system 5021, connects polarization apparatus 201, carries out projection imaging process for the linearly polarized light exported by polarization apparatus 201; Screen 5022, connects projection imaging system 5021, for presenting the projected image after process.
Preferably, the magnitude of voltage of the modulating pulse voltage of the present embodiment corresponds to the angle that linearly polarized light rotates, and the modulating pulse time of modulating pulse voltage is greater than the coherence time of linearly polarized light, is less than human eye integral time.
Preferably, the anglec of rotation of the present embodiment linearly polarized light is ± 90 degree; The modulating pulse magnitude of voltage of modulation power source is the magnitude of voltage corresponding to ± 90 degree.
Preferably, polarization apparatus 201, for when modulation power source is in low level, does not rotate the polarization direction of the linearly polarized light of input; When modulation power source is in high level, the polarization direction of the linearly polarized light of input is rotated, with the polarization light output that the linearly polarized light obtained with input is orthogonal.
In an actual product, the linearly polarized light generator of the embodiment of the present invention comprises: laser instrument, for generation of the polarized light of multiple polarization state; Polaroid, connecting laser, filters for the polarized light produced laser instrument, obtains linearly polarized light.Fig. 6 is the laser speckle suppression device schematic diagram corresponding to this actual product.
As shown in Figure 6, this device comprises: laser instrument 601, for generation of the polarized light of multiple polarization state; Polaroid 602, connecting laser 601, filters for the polarized light produced laser instrument 601, obtains linearly polarized light; Polarization apparatus 201, connect polaroid 602 and a modulation power source 202, for under the magnetically-actuated that produces at modulation power source 202, the polarization direction of the linearly polarized light transmitted by polaroid 602 rotates, with the polarization light output that the linearly polarized light obtained with input is orthogonal; Modulation power source 202, connects polarization apparatus 201, for providing modulating pulse voltage for polarization apparatus 201; Projection imaging system 5021, connects polarization apparatus 201, carries out projection imaging process for the linearly polarized light exported by polarization apparatus 201; Screen 5022, connects projection imaging system 5021, for presenting the projected image after process.
In another actual product, the linearly polarized light generator of the embodiment of the present invention is the laser instrument only producing linearly polarized light.Fig. 7 is the laser speckle suppression device schematic diagram corresponding to this actual product.
As shown in Figure 7, this device comprises: laser instrument 701, for generation of linearly polarized light; Polarization apparatus 201, connecting laser 701 and a modulation power source 202, for under the magnetically-actuated that produces at the modulating pulse voltage of modulation power source 202, the polarization direction of the linearly polarized light transmitted by laser instrument 701 rotates, with the polarization light output that the linearly polarized light obtained with input is orthogonal; Modulation power source 202, connects polarization apparatus 201, for providing modulating pulse voltage for polarization apparatus 201; Projection imaging system 5021, connects polarization apparatus 201, carries out projection imaging process for the linearly polarized light exported by polarization apparatus 201; Screen 5022, connects projection imaging system 5021, for presenting the projected image after process.
For Fig. 6, when the polarization apparatus anglec of rotation is 90 degree, the principle of work of embodiment of the present invention device is: the light beam that laser instrument 601 sends is by becoming linearly polarized light after polaroid 602; When modulation power source 202 is in low level, linearly polarized light is by throwing on screen 5022 after polarization apparatus 201 and projection imaging system 5021, and polarization direction does not change, and now polarization apparatus 201 is inoperative; When modulation power source 104 is in high level, polarization apparatus 201 can be given with λ/2 voltage, now linearly polarized light is by meeting 90-degree rotation in its polarization direction during polarization apparatus 201, and then is thrown on screen 5022 by projection imaging system 5021.
If the time interval of modulation signal is Δ t, the coherence time of linearly polarized light is t1, and human eye integral time is t2, if meet t1 < Δ t < t1, the speckle contrast then thrown on screen 5022 can fall 1/2, and speckle obtains further suppression.Such as, wavelength is 532nm, power is the solid state laser of 1W, its typical case t1=1 μ s coherence time, human eye t2=50ms integral time, if allow the modulation signal time interval Δ t of polarization apparatus 201 meet 1 μ s < Δ t < 50ms, then the speckle contrast on screen 5022 can fall 1/2, and speckle can further be suppressed.The technical scheme that Fig. 8 is the embodiment of the present invention and the speckle that prior art realizes suppress situation comparison diagram, as shown in Figure 8, as degree of polarization P=0, adopt the speckle contrast of embodiment of the present invention technical scheme to reduce by 1/2.
It should be noted that, 90-degree rotation is one embodiment of the present invention, as long as the polarization direction meeting the linearly polarized light exported from polarization apparatus is orthogonal with the polarization direction of the linearly polarized light of input polarization apparatus, if the anglec of rotation can also be negative 90 degree, or other angles.
The embodiment of the present invention also provides a kind of laser speckle suppressing method, and the method is realized by the restraining device that falls apart of previous embodiment, and Fig. 9 is the process flow diagram of the method, and as shown in Figure 9, the laser speckle suppressing method of the present embodiment comprises:
S901, generation linearly polarized light; This step can be completed by linearly polarized light generator 501, or is completed by laser instrument 601 and polaroid 602, or is completed by laser instrument 701.
S902, be provided as linearly polarized light rotate needed for modulating pulse voltage; This step is completed by modulation power source 202.
S903, modulating pulse voltage produce magnetically-actuated under, adopt polarization apparatus 201 polarization direction of linearly polarized light is rotated, with the polarization light output that the linearly polarized light obtained with input is orthogonal; This step is completed by polarization apparatus 201.
S904, the linearly polarized light exported by polarization apparatus 201 carry out projection imaging and show.
Alternatively, S904 comprises: the linearly polarized light exported by polarization apparatus 201 carries out projection imaging process, and this step is completed by projection imaging system 5021; And presenting the projected image after process, projected image is presented on screen 5022.
Preferably, the magnitude of voltage of modulating pulse voltage corresponds to the angle that linearly polarized light rotates, and the modulating pulse time of modulating pulse voltage is greater than the coherence time of linearly polarized light, is less than human eye integral time.
Preferably, the anglec of rotation of linearly polarized light is ± 90 degree; Modulating pulse magnitude of voltage is the magnitude of voltage corresponding to ± 90 degree.
Preferably, S703 specifically comprises: when modulating pulse voltage is in low level, and polarization apparatus does not rotate the polarization direction of the linearly polarized light of input; When modulating pulse voltage is in high level, the polarization direction of the linearly polarized light of input rotates, with the input line polarized light that the linearly polarized light obtained with input is orthogonal by polarization apparatus.
The technical scheme of the embodiment of the present invention can with other disappear Speckles Technique with the use of.Speckle contrast can be allowed to be down to 10%-15% as vibrated screen Speckles Technique or the random phase existing Speckles Techniques that disappear such as Speckles Technique that disappear that disappear, if coordinate this technology to use together speckle contrast can be down to 5%-8%, at this moment human eye cannot see speckle substantially, thus further suppress speckle noise, enhance image quality.
Be combined in the mode of the mode with the embodiment of the present invention of vibrating screen below and be described.It is to be noted; although the vibration mode of screen and the speckled fashion that disappears of the embodiment of the present invention are carried out combination to be described by example below; but this combination is only for making an explanation to the principle of work of the present embodiment; but not for limiting the protection domain of claim, those of ordinary skill in the art based on the combination of disappear speckled fashion and other Speckles Techniques that disappear existing disclosed in the embodiment of the present invention all within the protection domain of claim.
Figure 10 be existing vibration screen disappear Speckles Technique and the embodiment of the present invention dissipation spot combine with technique application schematic diagram, as shown in Figure 10, this technical scheme combines polarization diversity and vibration screen two kinds of dissipation spot schemes, screen 5022 does linear oscillator under the driving of gearing 1001, and its movement locus can be straight line and circumference.If only suppress speckle by the method for vibration screen, good result is that speckle contrast can drop to 15%-20%, if coordinate the method for polarization diversity that utilizes of the present invention to use together, speckle contrast can drop to 8%-10% further.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; above-described embodiment is only the specific embodiment of the present invention; the protection domain be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a laser speckle suppression device, is characterized in that, described laser speckle suppression device comprises:
Linearly polarized light generator, for generation of linearly polarized light;
Polarization apparatus, be made up of the optical active substance making linearly polarized light polarization direction rotate, connect described linearly polarized light generator, the polarization direction of the linearly polarized light transmitted by described linearly polarized light generator rotates, with the polarization light output that the linearly polarized light obtained with input is orthogonal;
Imaging display system, for the linearly polarized light Projection Display exported by described polarization apparatus.
2. laser speckle suppression device according to claim 1, it is characterized in that, described polarization apparatus is the magnetic control polarization apparatus based on power modulation, under the magnetically-actuated of modulating pulse voltage, makes polarized light rotate corresponding angle;
Wherein, described laser speckle suppression device also comprises modulation power source, for described magnetic control polarization apparatus provides described modulating pulse voltage.
3. laser speckle suppression device according to claim 2, it is characterized in that, the magnitude of voltage of described modulating pulse voltage corresponds to the angle that linearly polarized light rotates, and the modulating pulse time of described modulating pulse voltage is greater than the coherence time of linearly polarized light, is less than human eye integral time.
4. laser speckle suppression device according to claim 2, it is characterized in that, the anglec of rotation of described linearly polarized light is ± 90 degree; The modulating pulse magnitude of voltage of described modulation power source is the magnitude of voltage corresponding to described ± 90 degree.
5., according to the arbitrary described laser speckle suppression device of claim 2-4, it is characterized in that,
Described magnetic control polarization apparatus, for when modulation power source is in low level, does not rotate the polarization direction of the linearly polarized light of input; When modulation power source is in high level, the polarization direction of the linearly polarized light of input is rotated, with the polarization light output that the linearly polarized light obtained with input is orthogonal.
6. laser speckle suppression device according to claim 1, it is characterized in that, described linearly polarized light generator is the laser instrument only producing linearly polarized light.
7. laser speckle suppression device according to claim 1, it is characterized in that, described linearly polarized light generator comprises:
Laser instrument, for generation of the polarized light of multiple polarization state;
Polaroid, connects described laser instrument, filters, obtain linearly polarized light for the polarized light produced described laser instrument.
8. according to described laser speckle suppression device arbitrary in claim 1-7, it is characterized in that, described imaging display system, comprising:
Projection imaging system, connects described polarization apparatus, carries out projection imaging process for the linearly polarized light exported by polarization apparatus;
Screen, connects described projection imaging system, for presenting the projected image after process.
9. laser speckle suppression device according to claim 8, it is characterized in that, described device also comprises:
Gearing, connects described screen, carries out linear oscillator for driving described screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510074494.2A CN104614867B (en) | 2010-09-03 | 2010-09-03 | Optical rotor and device and method for inhibiting laser speckle based on optical rotor |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510074494.2A CN104614867B (en) | 2010-09-03 | 2010-09-03 | Optical rotor and device and method for inhibiting laser speckle based on optical rotor |
| CN201080067728.6A CN103052899B (en) | 2010-09-03 | 2010-09-03 | Optical rotator and laser speckle suppression divece and method based on the same |
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| CN106444068A (en) * | 2016-06-24 | 2017-02-22 | 天津大学 | Laser speckle inhibition method |
| WO2019061833A1 (en) * | 2017-09-29 | 2019-04-04 | 歌尔股份有限公司 | Speckle reduction device, laser light source, and laser projection system |
| WO2019100451A1 (en) * | 2017-11-22 | 2019-05-31 | 歌尔股份有限公司 | Speckle elimination apparatus, laser light source and laser projection system |
| CN112097925A (en) * | 2020-10-26 | 2020-12-18 | 杭州菲柏斯科技有限公司 | Optical fiber speckle wavelength meter based on polarization enhancement |
| US11333963B2 (en) | 2020-04-30 | 2022-05-17 | Coretronic Corporation | Illumination system and projection device |
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