技术领域technical field
本发明涉及光学测试与显微应用技术领域，具体涉及一种可调控超瑞利散斑场的制作方法。The invention relates to the technical field of optical testing and microscopic application, in particular to a method for making an adjustable super-Rayleigh speckle field.
背景技术Background technique
当相干光照射到散射介质上时，在透射场或反射场会产生明暗相间的颗粒状散斑图案；散斑的产生是由散射微粒的散射子波空间相干形成的。若散射介质的表面起伏大于入射光波长，散斑光场的强度分布符合瑞利统计，此时散斑场的光强遵从负e指数分布；对瑞利散斑场来说，其散斑图的对比度值为1。When the coherent light is irradiated on the scattering medium, a granular speckle pattern with alternating light and dark will be produced in the transmitted or reflected field; the generation of speckle is formed by the spatial coherence of the scattering wavelets of the scattering particles. If the surface fluctuation of the scattering medium is greater than the wavelength of the incident light, the intensity distribution of the speckle light field conforms to Rayleigh statistics, and at this time the light intensity of the speckle field follows the negative e-exponential distribution; for the Rayleigh speckle field, the speckle pattern has a contrast value of 1.
许多基础研究和应用领域要求散斑场的统计特性和光强分布可自由调控，这些散斑场的光强统计特性都不符合瑞利统计分布。根据对比度值大于1还是小于1，将非瑞利统计散斑分为超瑞利散斑和亚瑞利散斑；在非瑞利统计散斑场中，对比度值小于1的亚瑞利散斑场实质上是部分散射散斑场，这种散斑场相对而言比较容易实现，而对比度值大于1的超瑞利散斑场的产生是一个难题。Many basic research and application fields require that the statistical characteristics and light intensity distribution of speckle fields can be adjusted freely, but the statistical characteristics of light intensity of these speckle fields do not conform to the Rayleigh statistical distribution. According to whether the contrast value is greater than 1 or less than 1, the non-Rayleigh statistical speckle can be divided into super-Rayleigh speckle and araelian speckle; The field is essentially a partially scattered speckle field, which is relatively easy to realize, but the generation of a super-Rayleigh speckle field with a contrast value greater than 1 is a difficult problem.
此外，在散斑照明成像中，照明散斑光场的散斑大小也是一个重要的参数。由于散斑研究属于复合统计光学领域，对同一探测平面而言，若散斑尺寸太大，则探测平面内的散斑数量过少，使得样本中采样点数过少导致分析误差偏大；然而，散斑尺寸太小的话，探测平面内的采样点数太多导致计算量激增，降低了数据处理效率；因此，控制散斑场中的散斑大小非常重要。In addition, in speckle illumination imaging, the speckle size of the illumination speckle light field is also an important parameter. Since speckle research belongs to the field of compound statistical optics, for the same detection plane, if the speckle size is too large, the number of speckles in the detection plane will be too small, so that the number of sampling points in the sample is too small and the analysis error will be large; however, If the speckle size is too small, too many sampling points in the detection plane will lead to a surge in calculation and reduce the data processing efficiency; therefore, it is very important to control the speckle size in the speckle field.
发明内容Contents of the invention
本发明的目的是提供一种可调控超瑞利散斑场的制作装置及其制作方法，可在线制作散斑大小和对比度值可调控的超瑞利散斑场。The object of the present invention is to provide an adjustable super-Rayleigh speckle field production device and its production method, which can produce super-Rayleigh speckle fields with adjustable speckle size and contrast value online.
本发明为实现上述目的所采用的技术方案为：一种可调控超瑞利散斑场的制作装置，包括一连续波激光器、计算机I以及计算机II，在该连续波激光器的光束前进方向上依次设有可调激光衰减器、针孔滤波器、透镜、起偏器I以及分束镜，分束镜位于另外两个不同的光束前进方向上，其中一个光束前进方向上设有反射式空间光调制器，另一个光束前进方向上设有检偏器I、光阑I、起偏器II、透射式空间光调制器、检偏器II、光阑II、傅里叶透镜、CCD相机；其中，反射式空间光调制器和CCD相机与计算机I相连，反射式空间光调制器上的图像由计算机I写入；经过透射式空间光调制器后产生的散斑场信息经CCD相机成像后，存储到计算机I中；透射式空间光调制器与计算机II相连；所述的透射式空间光调制器位于傅里叶透镜的前焦平面上，所述的CCD相机位于傅里叶透镜的后焦平面上。The technical solution adopted by the present invention to achieve the above object is: a device for making a controllable super-Rayleigh speckle field, including a continuous wave laser, computer I and computer II, sequentially in the forward direction of the beam of the continuous wave laser It is equipped with adjustable laser attenuator, pinhole filter, lens, polarizer I and beam splitter. The beam splitter is located in the other two different beam advancing directions, and one of the beam advancing directions is equipped with reflective spatial light The modulator is provided with an analyzer I, an aperture I, a polarizer II, a transmission spatial light modulator, an analyzer II, an aperture II, a Fourier lens, and a CCD camera in the advancing direction of another light beam; , the reflective spatial light modulator and the CCD camera are connected to the computer I, and the image on the reflective spatial light modulator is written by the computer I; after the speckle field information generated by the transmissive spatial light modulator is imaged by the CCD camera, Stored in the computer I; the transmissive spatial light modulator is connected with the computer II; the transmissive spatial light modulator is located on the front focal plane of the Fourier lens, and the CCD camera is located at the back focus of the Fourier lens on flat surface.
利用上述装置制作可调控超瑞利散斑场的方法，具体制作步骤为：步骤一、利用计算机II，采用波长为l的入射光透过漫射体，制作复振幅分布为ERay的瑞利散斑场，，其中，漫射体所在平面为αβ平面，目标所在平面为平面，平面与αβ平面间的距离为z0；P（α，β）为光瞳函数，，表示取矩形函数；φ（α，β）表示漫射体的复振幅透过率函数，其取值为在0~2p之间随机分布的相位矩阵；其中，a、b均为正数；j为虚数单位，k为波数；The method for producing an adjustable super-Rayleigh speckle field by using the above-mentioned device, the specific production steps are: Step 1, using the computer II, using the incident light with a wavelength of 1 to pass through the diffuser, and producing a Rayleigh with a complex amplitude distribution of ERay speckle field, , where the plane where the diffuser is located is the αβ plane, and the plane where the target is located is flat, The distance between the plane and the αβ plane is z0 ; P(α, β) is the pupil function, , Represents a rectangular function; φ(α, β) represents the complex amplitude transmittance function of the diffuser, and its value is a phase matrix randomly distributed between 0 and 2p; where a and b are positive numbers; j is the imaginary unit, k is the wave number;
步骤二、对瑞利散斑场的复振幅分布加上一个指数因子S，得到超瑞利散斑场，超瑞利散斑场的复振幅分布为，S取大于1的整数；Step 2. Complex amplitude distribution of Rayleigh speckle field Adding an exponential factor S, the super-Rayleigh speckle field is obtained, and the complex amplitude distribution of the super-Rayleigh speckle field is , S takes an integer greater than 1;
步骤三、对超瑞利散斑场的复振幅分布进行傅里叶逆变换，并取其相位矩阵，，其中，表示取傅里叶逆变换，表示取相位；Step 3. Complex amplitude distribution of super-Rayleigh speckle field Perform inverse Fourier transform and take its phase matrix , ,in, Indicates taking the inverse Fourier transform, Indicates the phase;
步骤四、利用计算机II，将步骤三获得的相位矩阵输入透射式空间光调制器；Step 4, using computer II, the phase matrix obtained in step 3 Input transmissive spatial light modulator;
步骤五、利用计算机I，生成拉盖尔-高斯光束复振幅分布与闪耀光栅复振幅分布叠加后的相位图用表示，其中，，为缔合拉盖尔多项式；r、θ为极坐标；为光束束腰半径，单位为毫米；m为角向指数，m取整数；p为径向指数，P取非负整数；A0为振幅常数；；其中，j为虚数单位，k为波数；Step five, using computer I to generate the Laguerre-Gaussian beam complex amplitude distribution Complex amplitude distribution with blazed grating The superimposed phase map with said, among them, , is the associated Laguerre polynomial; r and θ are polar coordinates; is the beam waist radius, in millimeters; m is the angular index, and m is an integer; p is the radial index, and P is a non-negative integer; A0 is the amplitude constant; ; Wherein, j is the imaginary number unit, and k is the wave number;
步骤六、利用计算机I，将步骤五生成的相位图输入到反射式空间光调制器中；Step 6, utilize computer 1, the phase diagram that step 5 generates input into the reflective spatial light modulator;
步骤七、打开连续波激光器，连续波激光器射出的激光束依次经过可调激光衰减器、针孔滤波器、透镜、起偏器I、分束镜后，照射在反射式空间光调制器上，经过反射式空间光调制器反射后的光束为拉盖尔-高斯涡旋光束，拉盖尔-高斯涡旋光束依次经过分束镜、检偏器I、光阑I、起偏器II，照射在透射式空间光调制器上后，产生散斑光束，散斑光束依次经过检偏器II、光阑II、傅里叶透镜后，进入CCD相机成像，所成超瑞利散斑图像存储进计算机I，超瑞利散斑图像用Is表示；Step 7, turn on the continuous wave laser, the laser beam emitted by the continuous wave laser passes through the adjustable laser attenuator, pinhole filter, lens, polarizer I, and beam splitter in sequence, and then irradiates on the reflective spatial light modulator, The beam reflected by the reflective spatial light modulator is a Laguerre-Gaussian vortex beam, and the Laguerre-Gaussian vortex beam passes through the beam splitter, analyzer I, diaphragm I, and polarizer II in sequence, and irradiates After passing through the transmissive spatial light modulator, a speckle beam is generated, and the speckle beam passes through the analyzer II, diaphragm II, and Fourier lens in turn, and then enters the CCD camera for imaging, and the super-Rayleigh speckle image formed is stored in the Computer I, the super-Rayleigh speckle image is represented by Is;
步骤八、利用散斑图像对比度定义公式计算出超瑞利散斑图像Is的对比度值，其中<…>表示取系综平均；该对比度公式为信息光学领域公知；Step 8. Use the speckle image contrast to define the formula Calculate the contrast value of the super-Rayleigh speckle image Is, where <...> represents an ensemble average; the contrast formula is well known in the field of information optics;
步骤九、在xy二维坐标系中，利用散斑图像Is的自协方差函数，计算超瑞利散斑图像Is的散斑平均大小，其中，、分别表示傅里叶变换及傅里叶逆变换，表示取系综平均；Step 9: In the xy two-dimensional coordinate system, use the autocovariance function of the speckle imageIs , to calculate the average speckle size of the super-Rayleigh speckle image Is, where, , represent Fourier transform and inverse Fourier transform respectively, and represent the ensemble average;
步骤十、指数因子S 在2~10范围内取整数值时，利用计算机II，将不同S值对应获得的相位矩阵分别输入透射式空间光调制器，利用步骤七和步骤八，实现超瑞利散斑场的对比度值V在1~5范围内调节；同时，角向指数m在1~10范围内取整数值时，利用计算机I，将不同m值对应获得的相位图输入到反射式空间光调制器中，利用步骤七和步骤八，实现超瑞利散斑场中的散斑颗粒平均大小在3~30个像素尺寸范围内的调节。Step 10. When the exponential factorS takes an integer value in the range of 2 to 10, use the computer II to correspond to the obtained phase matrix with different S values Input the transmissive spatial light modulator respectively, and use steps 7 and 8 to adjust the contrast value V of the super-Rayleigh speckle field within the range of 1~5; at the same time, the angular index m takes an integer value within the range of 1~10 When , use computer I to correspond to the obtained phase diagram with different m values Input it into the reflective spatial light modulator, and use steps 7 and 8 to adjust the average size of speckle particles in the super-Rayleigh speckle field within the range of 3 to 30 pixel sizes.
本发明中，可调激光衰减器用于控制照射在反射式空间光调制器上的激光光强；所述的针孔滤波器、透镜用于对光束进行整形、准直；所述的光阑I和光阑II用于选择一级衍射涡旋光束；In the present invention, the adjustable laser attenuator is used to control the laser light intensity irradiated on the reflective spatial light modulator; the pinhole filter and the lens are used to shape and collimate the light beam; the aperture I and diaphragm II are used to select the first-order diffracted vortex beam;
本发明中，m为角向指数，m 取整数，代表涡旋光束的拓扑荷值。In the present invention, m is an angular index, andm is an integer, representing the topological charge value of the vortex beam.
本发明的有益效果：本发明制作装置制作的超瑞利散斑场中，散斑图的对比度V与指数因子S 成正比，散斑的平均大小与角向指数m 成反比；通过改变指数因子S 和角向指数m 的数值，获得目标超瑞利散斑场，从而得到散斑大小、对比度值可调控的超瑞利散斑场。通过采用不同的S 和V 的数值组会，可实现散斑大小、对比度值可调控的超瑞利散斑场。与现有技术相比，本发明制作装置和制作方法在不改变光路的情况下，能够实现散斑大小、对比度值自由调控，具有可动态在线调控的特点。Beneficial effects of the present invention: in the super-Rayleigh speckle field produced by the production device of the present invention, the contrastV of the speckle pattern is proportional to the exponent factorS , and the average size of the speckle is inversely proportional to the angular exponentm ; by changing the exponent factor The value ofS and the angular indexm can obtain the target super-Rayleigh speckle field, so as to obtain the super-Rayleigh speckle field with adjustable speckle size and contrast value. By adopting different numerical combinations ofS andV , a super-Rayleigh speckle field with adjustable speckle size and contrast value can be realized. Compared with the prior art, the manufacturing device and manufacturing method of the present invention can realize free regulation of speckle size and contrast value without changing the optical path, and has the feature of dynamic online regulation.
附图说明Description of drawings
图1为本发明可调控超瑞利散斑场的制作装置图；FIG. 1 is a diagram of a production device for an adjustable super-Rayleigh speckle field in the present invention;
图2是角向指数m =3、指数因子S =3时得到的超瑞利散斑图；Figure 2 is the super-Rayleigh speckle pattern obtained when the angular indexm = 3 and the index factorS = 3;
图3是角向指数m =3、指数因子S =5时得到的超瑞利散斑图；Figure 3 is the super-Rayleigh speckle pattern obtained when the angular indexm = 3 and the index factorS = 5;
图4是角向指数m =1、指数因子S =2时得到的超瑞利散斑图；Figure 4 is the super-Rayleigh speckle pattern obtained when the angular indexm = 1 and the index factorS = 2;
图5是角向指数m =4、指数因子S =2时得到的超瑞利散斑图。Figure 5 is the super-Rayleigh speckle pattern obtained when the angular indexm = 4 and the index factorS = 2.
附图标记：100、连续波激光器，200、可调激光衰减器，300、针孔滤波器，401、透镜，402、傅里叶透镜，501、起偏器I，502、检偏器I，503、起偏器II，504、检偏器II，600、分束镜，701、反射式空间光调制器，702、透射式空间光调制器，801、光阑I，802、光阑II，900、CCD相机，1001、计算机I，1002、计算机II。Reference signs: 100, continuous wave laser, 200, adjustable laser attenuator, 300, pinhole filter, 401, lens, 402, Fourier lens, 501, polarizer 1, 502, analyzer 1, 503, polarizer II, 504, analyzer II, 600, beam splitter, 701, reflective spatial light modulator, 702, transmissive spatial light modulator, 801, diaphragm I, 802, diaphragm II, 900, CCD camera, 1001, computer I, 1002, computer II.
具体实施方式detailed description
下面结合具体实施例对本发明的可调控超瑞利散斑场的制作装置及其制作方法作进一步说明，以使本领域的技术人员可以更好的理解本发明并能予以实施，但所举实施例不作为对本发明的限定。The manufacturing device and manufacturing method of the adjustable super-Rayleigh speckle field of the present invention will be further described below in conjunction with specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the implementation Examples are not intended to limit the present invention.
一种可调控超瑞利散斑场的制作装置，如图1所示，包括一连续波激光器100、计算机I1001以及计算机II1002，在该连续波激光器100的光束前进方向上依次设有可调激光衰减器200、针孔滤波器300、透镜401、起偏器I501以及分束镜600，分束镜600位于另外两个不同的光束前进方向上，其中一个光束前进方向上设有反射式空间光调制器701，另一个光束前进方向上设有检偏器I502、光阑I801、起偏器II503、透射式空间光调制器702、检偏器II504、光阑II802、傅里叶透镜402、CCD相机900。A device for making a controllable super-Rayleigh speckle field, as shown in Figure 1, includes a continuous wave laser 100, a computer I1001 and a computer II1002, and the continuous wave laser 100 is sequentially provided with an adjustable laser The attenuator 200, the pinhole filter 300, the lens 401, the polarizer I501 and the beam splitter 600, the beam splitter 600 is located in two other different beam advancing directions, and one of the beam advancing directions is provided with a reflective spatial light Modulator 701, another beam forward direction is provided with analyzer I502, aperture I801, polarizer II503, transmission spatial light modulator 702, analyzer II504, aperture II802, Fourier lens 402, CCD Camera 900.
其中，反射式空间光调制器701和CCD相机900与计算机I1001相连，反射式空间光调制器701上的图像由计算机I1001写入；经过透射式空间光调制器702后产生的散斑场信息经CCD相机900成像后，存储到计算机I1001中；透射式空间光调制器702与计算机II1002相连；透射式空间光调制器702位于傅里叶透镜402的前焦平面上，所述的CCD相机900位于傅里叶透镜402的后焦平面上。Among them, the reflective spatial light modulator 701 and the CCD camera 900 are connected to the computer I1001, and the image on the reflective spatial light modulator 701 is written by the computer I1001; the speckle field information generated by the transmissive spatial light modulator 702 is passed through After CCD camera 900 imaging, store in computer I1001; Transmissive spatial light modulator 702 is connected with computer II1002; The Fourier lens 402 is on the back focal plane.
利用上述装置制作可调控超瑞利散斑场的方法，具体制作步骤为：步骤一、利用计算机II，采用波长为l的入射光透过漫射体，制作复振幅分布为ERay的瑞利散斑场，，其中，漫射体所在平面为αβ平面，目标所在平面为平面，平面与αβ平面间的距离为z0；P（α，β）为光瞳函数，，表示取矩形函数；φ（α，β）表示漫射体的复振幅透过率函数，其取值为在0~2p之间随机分布的相位矩阵；其中，a、b均为正数；j为虚数单位，k为波数；The method for producing an adjustable super-Rayleigh speckle field by using the above-mentioned device, the specific production steps are: Step 1, using the computer II, using the incident light with a wavelength of 1 to pass through the diffuser, and producing a Rayleigh with a complex amplitude distribution of ERay speckle field, , where the plane where the diffuser is located is the αβ plane, and the plane where the target is located is flat, The distance between the plane and the αβ plane is z0 ; P(α, β) is the pupil function, , Represents a rectangular function; φ(α, β) represents the complex amplitude transmittance function of the diffuser, and its value is a phase matrix randomly distributed between 0 and 2p; where a and b are positive numbers; j is the imaginary unit, k is the wave number;
步骤二、对瑞利散斑场的复振幅分布加上一个指数因子S，得到超瑞利散斑场，超瑞利散斑场的复振幅分布为，S取大于1的整数；Step 2. Complex amplitude distribution of Rayleigh speckle field Adding an exponential factor S, the super-Rayleigh speckle field is obtained, and the complex amplitude distribution of the super-Rayleigh speckle field is , S takes an integer greater than 1;
步骤三、对超瑞利散斑场的复振幅分布进行傅里叶逆变换，并取其相位矩阵，，其中，表示取傅里叶逆变换，表示取相位；Step 3. Complex amplitude distribution of super-Rayleigh speckle field Perform inverse Fourier transform and take its phase matrix , ,in, Indicates taking the inverse Fourier transform, Indicates the phase;
步骤四、利用计算机II，将步骤三获得的相位矩阵输入透射式空间光调制器；Step 4, using computer II, the phase matrix obtained in step 3 Input transmissive spatial light modulator;
步骤五、利用计算机I，生成拉盖尔-高斯光束复振幅分布与闪耀光栅复振幅分布叠加后的相位图用表示，其中，，为缔合拉盖尔多项式；r、θ为极坐标；为光束束腰半径，单位为毫米；m为角向指数，m取整数；p为径向指数，P取非负整数；A0为振幅常数；；其中，j为虚数单位，k为波数；Step five, using computer I to generate the Laguerre-Gaussian beam complex amplitude distribution Complex amplitude distribution with blazed grating The superimposed phase map with said, among them, , is the associated Laguerre polynomial; r and θ are polar coordinates; is the beam waist radius, in millimeters; m is the angular index, and m is an integer; p is the radial index, and P is a non-negative integer; A0 is the amplitude constant; ; Wherein, j is the imaginary number unit, and k is the wave number;
步骤六、利用计算机I，将步骤五生成的相位图输入到反射式空间光调制器中；Step 6, utilize computer 1, the phase diagram that step 5 generates input into the reflective spatial light modulator;
步骤七、打开连续波激光器，连续波激光器射出的激光束依次经过可调激光衰减器、针孔滤波器、透镜、起偏器I、分束镜后，照射在反射式空间光调制器上，经过反射式空间光调制器反射后的光束为拉盖尔-高斯涡旋光束，拉盖尔-高斯涡旋光束依次经过分束镜、检偏器I、光阑I、起偏器II，照射在透射式空间光调制器上后，产生散斑光束，散斑光束依次经过检偏器II、光阑II、傅里叶透镜后，进入CCD相机成像，所成超瑞利散斑图像存储进计算机I，超瑞利散斑图像用Is表示；Step 7, turn on the continuous wave laser, the laser beam emitted by the continuous wave laser passes through the adjustable laser attenuator, pinhole filter, lens, polarizer I, and beam splitter in sequence, and then irradiates on the reflective spatial light modulator, The beam reflected by the reflective spatial light modulator is a Laguerre-Gaussian vortex beam, and the Laguerre-Gaussian vortex beam passes through the beam splitter, analyzer I, diaphragm I, and polarizer II in sequence, and irradiates After passing through the transmissive spatial light modulator, a speckle beam is generated, and the speckle beam passes through the analyzer II, diaphragm II, and Fourier lens in turn, and then enters the CCD camera for imaging, and the super-Rayleigh speckle image formed is stored in the Computer I, the super-Rayleigh speckle image is represented by Is;
步骤八、利用散斑图像对比度定义公式计算出超瑞利散斑图像Is的对比度值，其中<…>表示取系综平均；Step 8. Use the speckle image contrast to define the formula Calculate the contrast value of the super-Rayleigh speckle image Is, where <…> means to take the ensemble average;
步骤九、在xy二维坐标系中，利用散斑图像Is的自协方差函数，计算超瑞利散斑图像Is的散斑平均大小，其中，、分别表示傅里叶变换及傅里叶逆变换，表示取系综平均；Step 9: In the xy two-dimensional coordinate system, use the autocovariance function of the speckle imageIs , to calculate the average speckle size of the super-Rayleigh speckle image Is, where, , represent Fourier transform and inverse Fourier transform respectively, and represent the ensemble average;
步骤十、指数因子S 在2~10范围内取整数值时，利用计算机II，将不同S值对应获得的相位矩阵分别输入透射式空间光调制器，利用步骤七和步骤八，实现超瑞利散斑场的对比度值V在1~5范围内调节；同时，角向指数m在1~10范围内取整数值时，利用计算机I，将不同m值对应获得的相位图输入到反射式空间光调制器中，利用步骤七和步骤八，实现超瑞利散斑场中的散斑颗粒平均大小在3~30个像素尺寸范围内的调节。Step 10. When the exponential factorS takes an integer value in the range of 2 to 10, use the computer II to correspond to the obtained phase matrix with different S values Input the transmissive spatial light modulator respectively, and use steps 7 and 8 to adjust the contrast value V of the super-Rayleigh speckle field within the range of 1~5; at the same time, the angular index m takes an integer value within the range of 1~10 When , use computer I to correspond to the obtained phase diagram with different m values Input it into the reflective spatial light modulator, and use steps 7 and 8 to adjust the average size of speckle particles in the super-Rayleigh speckle field within the range of 3 to 30 pixel sizes.
本发明中，步骤九的自协方差函数中，为方向的自相关峰值，其半高宽为方向的散斑平均尺寸；为y 方向的自相关峰值，其半高宽为y 方向的散斑平均尺寸。In the present invention, in the autocovariance function of step 9, is the autocorrelation peak of the direction, and its full width at half maximum is the average speckle size of the direction; is the autocorrelation peak in they direction, and its full width at half maximum is the average speckle size in they direction.
本发明制得的超瑞利散斑场中，散斑图的对比度V 与指数因子S 成正比，散斑的平均大小与角向指数m 成反比；通过改变指数因子S 和角向指数m 的数值，获得目标超瑞利散斑场，从而得到散斑大小、对比度值可调控的超瑞利散斑场；In the super-Rayleigh speckle field prepared by the present invention, the contrastV of the speckle pattern is proportional to the index factorS , and the average size of the speckle is inversely proportional to the angular indexm ; by changing the index factorS and the angular indexm Value, to obtain the target super-Rayleigh speckle field, so as to obtain the super-Rayleigh speckle field with adjustable speckle size and contrast value;
本实施例中，角向指数m =3、指数因子S =3、5时得到的超瑞利散斑图，如图2、图3所示；计算可得图2散斑图的对比度值V =1.305，散斑平均大小为8.782 Pixels；图3散斑图的对比度值V =2.876，散斑平均大小为10.256 Pixels；其中，Pixels为像素单位。In this embodiment, the hyper-Rayleigh speckle pattern obtained when the angular indexm = 3 and the index factorS = 3, 5 is shown in Figure 2 and Figure 3; the contrast valueV of the speckle pattern in Figure 2 can be obtained by calculation =1.305, the average size of the speckle is 8.782 Pixels; the contrast value of the speckle image in Figure 3V =2.876, the average size of the speckle is 10.256 Pixels; where Pixels is the pixel unit.
图4、图5分别为指数因子S =2，角向指数m =1、4时得到的超瑞利散斑图，计算可得图4散斑图的对比度值V =1.112，散斑平均大小为19.032 Pixels；图5散斑图的对比度值V=1.117，散斑平均大小为7.564 Pixels。Figure 4 and Figure 5 are the super-Rayleigh speckle patterns obtained when the index factorS = 2 and the angular indexm = 1 and 4, respectively. The contrast valueV = 1.112 of the speckle pattern in Fig. 4 can be obtained by calculation, and the average size of the speckle is 19.032 Pixels; the contrast value of the speckle image in Figure 5 isV =1.117, and the average size of the speckle is 7.564 Pixels.
经实验表明：本发明装置和方法能实现散斑大小、对比度可调控的散斑场，并且具有原理简洁、可在线动态调控，易于操作的优点。能够广泛应用于激光散斑照明显微技术、散斑对比度值测试技术、涡旋鬼成像及恒星强度干涉等领域。Experiments show that the device and method of the present invention can realize a speckle field with adjustable speckle size and contrast, and has the advantages of simple principle, online dynamic adjustment, and easy operation. It can be widely used in the fields of laser speckle illumination microscopy, speckle contrast value testing technology, vortex ghost imaging and stellar intensity interference.
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