CN117518515A - Scattered multi-focal-plane simultaneous focusing system based on orthogonal linear polarized light - Google Patents
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Abstract
The invention discloses a multi-focal-plane simultaneous focusing system based on scattered orthogonal linear polarized light, which mainly comprises a 4f system taking orthogonal linear polarized light and light beams as vector light fields, two micro-objective lenses for zooming light spots, a high-order scattering medium and two CMOS receivers, wherein the 4f system comprises a spatial light modulator for modulating phases. The system can realize the reconstruction of the vector light field after passing through the high-order scattering medium by calculating a vector transmission matrix of the vector light field based on orthogonal linearly polarized light and utilizing the vector transmission matrix, and can also realize the simultaneous focusing of the linearly polarized light in the horizontal and vertical polarization directions in the vector light field at different positions on focal planes at different distances by regulating and controlling elements in one vector transmission matrix. The system is suitable for the field of linearly polarized light which needs to be focused at any distance behind a high-order scattering medium in the horizontal and vertical polarization directions.
Description
Technical Field
The invention relates to the technical field of photoelectricity, in particular to a scattered multi-focal-plane simultaneous focusing system based on orthogonal linear polarized light.
Background
Scattering is in most cases a negative disturbance, which people have been trapped. In 2007, the Mosk group of subjects has attracted considerable attention, who have used wavefront modulation techniques to alter the wavefront phase of light after it passes through a scattering medium, enabling it to achieve focusing. The advent of this technology has raised interest in wavefront phase modulation. Further research shows that the optical transmission matrix can combine outgoing light and incoming light transmitted through the scattering medium, and the phase conjugation technology is utilized to realize focusing and imaging at any position. In recent years, research on scattered light has been in progress, and scattering focusing techniques have been developed more. Through studies of the properties of scattered light, we have successfully achieved focused imaging applications through scattering media through a variety of approaches.
With the development of light field reconstruction techniques through scattering media, there is increasing interest in manipulating the polarization state of the light field passing through the scattering media, and the generation of high-resolution light field higher order scattering media (HSM) has become an emerging topic of research. Since the interaction of the light beam with the HSM can lead to distortion of the polarization distribution, interference of information transmission and damage to imaging, a rich approach has emerged to overcome the negative effects of scattering. In these methods, the light transmission matrix technique provides a new idea for overcoming scattering by reconstructing the structured light beam after passing through the scattering medium.
Recently, the proposal of the Vector Transfer Matrix (VTM) concept has provided a qualitative relationship of amplitude, phase and polarization states between the input and output light fields through the scattering medium. In 2012, tripath et al proposed a method of measuring VTM. By means of the method, the VTM of the scattering medium can be calculated, and the target light field is focused through a phase conjugation method and a four-step phase shift method. However, in general, only a VTM can correspondingly express the transmission process between the higher-order scattering medium and the receiver at a fixed distance, that is, only one VTM can be used to cancel the scattering at a fixed distance. In view of the present situation, if it is challenging to achieve focusing of two light beams at different distances by using one VTM, there is no method in the market that can simultaneously generate focusing of two light beams at any different distances behind a scattering medium, and it is a problem to be solved in the present situation.
Disclosure of Invention
In order to solve the above problems, a scattered multi-focal plane simultaneous focusing system based on orthogonal linear polarized light was invented in this work. The method realizes the calculation of the vector transmission matrix of the vector light field based on orthogonal linearly polarized light, realizes the reconstruction of the vector light field after passing through the high-order scattering medium by using the vector transmission matrix, and can also realize the simultaneous focusing of the linearly polarized light in the horizontal and vertical polarization directions in the vector light field at different positions on focal planes at different distances by regulating and controlling elements in one vector transmission matrix.
Technical proposal
A post-scattering multi-focal-plane simultaneous focusing system based on orthogonal linear polarized light, comprising:
a laser for emitting laser light and into the 4f system (1);
the 4f system (1) is used for converting orthogonal linearly polarized light and beams into vector light fields and comprises a spatial light modulator (2) for modulating phases, two Fourier lenses (3 and 6), a double-hole filter (4), a double-glued lambda/2 wave plate (5) and a Langmuir grating (7); the Fourier lenses (3, 6) are respectively and correspondingly arranged between the spatial light modulator (2) and the double-hole filter (4) and between the double-glued lambda/2 wave plate (5) and the Langmuir grating (7) in sequence, +1-order light beams of an x axis and a y axis on a spectrum surface after being reflected by the spatial light modulator (2) are extracted through the double-hole filter (4), the two light beams are respectively converted into orthogonal horizontal and vertical polarized light through different glued surfaces of the double-glued lambda/2 wave plate (5), and the orthogonal horizontal and vertical polarized light and the orthogonal vertical polarized light beams are converted into vector light through the Langmuir grating (7);
a high-order scattering medium (9) for scattering the vector light beam passing through;
a microscope objective (8, 10) for scaling speckle generated after the high-order scattering medium (9); the micro objective lens (8) is used for converging the energy of incident light to penetrate through the high-order scattering medium (9), and the micro objective lens (10) for amplifying a target is used for collecting optical signals after penetrating through the high-order scattering medium (9);
a beam splitter prism (11) for splitting the optical signals collected by the microscope objectives (8, 10) into two identical beams of light having mutually perpendicular propagation directions;
the CMOS receivers (12, 13) are used for respectively and correspondingly receiving optical signals of the two beams of light split by the beam splitter prism (11) and transmitting the optical signals to the control device;
wherein, with the 4f system based phase modulation, the generated vector light field is as shown in the following formula one:
wherein A is 0 Is amplitude delta 1 (x, y) and delta 2 (x, y) are additional phases in the x-direction and y-direction, respectively, loaded into the spatial light modulator (2).
Further, two orthogonal linear polarized lights with horizontal and vertical polarization directions are coherently overlapped to obtain a vector light field, and the vector light field passes through the high-order scattering medium (9), and a Vector Transmission Matrix (VTM) is shown in the following formula II:
wherein m, n, p, q represent an input plane (m, n) point and an output plane (p, q) point, respectively;
further, the linearly polarized light in the horizontal and vertical polarization directions in the vector beam is focused on a higher-order scattering medium (9) through a micro objective lens (8), then collected by a micro objective lens (10) and transmitted to CMOS receivers (12, 13) with optical path distances of 80mm and 120mm respectively through a beam splitting prism (11) in a speckle intensity pattern, and each column of a Hadamard matrix is used as an input mode, and elements T are calibrated according to a four-step phase shifting method and by measuring the corresponding input modes xx And T is yy Thereby obtaining the total composition of the Vector Transmission Matrix (VTM) of the higher order scattering medium (9).
Further, by means of conjugate operation on the Vector Transmission Matrix (VTM), the obtained modulated wavefront phase is loaded to the spatial light modulator (2) to overcome the scattering effect of the two orthogonal linearly polarized light beams in the vector light beams passing through the high-order scattering medium (9), and the modulation function of the spatial light modulator (2) is shown in the following formula three:
wherein γ represents modulation depth, f 0 Representing spatial carrier frequency, delta x And delta y Respectively represent T in VTM xx And T is yy The corresponding Hadamard-based phase, the horizontally polarized linear polarized light and the vertically polarized linear polarized light respectively pass throughAnd->The linear polarized light of the horizontal polarization and the linear polarized light of the vertical polarization of the vector light field can be respectively obtained by focusing at 80mm and 120 mm.
Further, by adding any target phase, such as a distortion phase uxy, to the holographic phase diagram of the spatial light modulator (2), horizontally polarized linear polarized light and vertically polarized linear polarized light can be focused at different distances behind the higher order scattering medium (9), and the modulation function of the spatial light modulator (2) is expressed as the following formula four:
wherein delta 1 ＝uxy，δ 2 ＝-uxy。
Further preferably, the high-order scattering medium (9) is 220-sand isotropic ground glass
The beneficial effects are that:
compared with the prior art, the invention has the following beneficial effects:
the method can realize that the linearly polarized light in the horizontal and vertical polarization directions in the vector light field is respectively focused at different positions on focal planes at different distances through regulating and controlling each element in one vector transmission matrix.
The flexibility is high, the calculation of a vector transmission matrix of a vector light field based on orthogonal linearly polarized light can be realized, the reconstruction of the vector light field after passing through a high-order scattering medium is realized by using the vector transmission matrix, and the structure is stable;
the method is suitable for the field of linearly polarized light which needs to focus the horizontal polarization direction and the vertical polarization direction at any distance behind the high-order scattering medium, and has the characteristics of convenience in operation, flexible regulation and control, stable effect and the like.
Drawings
FIG. 1 is a schematic diagram of a scattered multi-focal-plane simultaneous focusing system based on orthogonal linear polarization light according to the present invention;
FIG. 2 is a schematic diagram of scattered focal light intensity for a vector light field based on orthogonal linearly polarized light;
FIG. 3 is a schematic diagram of the intensity of horizontally polarized linearly polarized light (80 mm) and vertically polarized linearly polarized light (120 mm) in an orthogonal linearly polarized light based vector light field focused simultaneously at different distance focal planes;
fig. 4 is a schematic diagram of the intensity of horizontally polarized light (80 mm) and vertically polarized light (120 mm) in a vector light field carrying a twisted phase based on orthogonal linearly polarized light focused simultaneously at different distance focal planes.
Reference numerals
4f system 1, spatial light modulator 2, fourier lens 3, dual-hole filter 4, dual-glued lambda/2 wave plate 5, fourier lens 6, langerhans grating 7, micro-objective 8, scattering medium 9, micro-objective 10, beam-splitting prism 11, CMOS receiver 12 and CMOS receiver 13.
Detailed Description
For a better illustration of the present invention, the following description is made with reference to the accompanying drawings and examples:
as shown in fig. 1 to 4, a multi-focal-plane simultaneous focusing system after scattering based on orthogonal linear polarized light includes a 4f system 1 generating a vector light field based on orthogonal linear polarized light under the control of a control device, a laser for emitting laser light and injecting into the 4f system (1), a microscope objective 8 for converging a target, a higher-order scattering medium 9, a microscope objective 10 for amplifying the target, a beam splitting prism 11, CMOS receivers 12, 13, and a control device (e.g., a computer on the right side in fig. 1).
Wherein a high order scattering medium (9) is used for letting the vector beam pass through an isotropic frosted glass which is scattered, preferably 220 sand degrees. A microscope objective (8, 10) for scaling speckle generated after a higher-order scattering medium (9); the micro objective lens (8) is used for converging the energy of incident light to penetrate through the high-order scattering medium (9), and the micro objective lens (10) for amplifying the target is used for collecting the optical signals after penetrating through the high-order scattering medium (9); a beam splitter prism (11) for splitting the optical signals collected by the microscope objectives (8, 10) into two identical beams of light having mutually perpendicular propagation directions; the CMOS receivers (12, 13) are used for respectively and correspondingly receiving optical signals of the two beams of light split by the beam splitting prism (11) and transmitting the optical signals to the control device;
further, as shown in fig. 1, the 4f system is used for converting orthogonal linearly polarized light and beams into vector light fields, and comprises a spatial light modulator (2) for modulating phases, two fourier lenses (3, 6), a double-hole filter (4), a double-glued lambda/2 wave plate (5) and a langbeige grating (7); the Fourier lenses (3, 6) are respectively and correspondingly arranged between the spatial light modulator (2) and the double-hole filter (4) and between the double-glued lambda/2 wave plate (5) and the Langgy grating (7), +1-order light beams of an x axis and a y axis on a spectrum surface after being reflected by the spatial light modulator (2) are extracted through the double-hole filter (4), the two light beams are respectively converted into orthogonal horizontal and vertical polarized light through different glued surfaces of the double-glued lambda/2 wave plate (5), and the orthogonal horizontal and vertical polarized light beams are vector light through the Langgy grating (7); the input light fields of different polarization and phase distribution depend on the hologram loaded on the SLM.
Further, with 4f system based phase modulation, the generated vector light field is as shown in the following equation one
Wherein A is 0 Is amplitude delta 1 (x, y) and delta 2 (x, y) are additional phases in the x-direction and y-direction, respectively, loaded into the spatial light modulator (2).
Further, the vector light field obtained by coherent superposition of two orthogonal linearly polarized lights passes through the high-order scattering medium (9), and the Vector Transmission Matrix (VTM) is shown as the following formula II (the VTM of the isotropic high-order scattering medium used in the work has T xy ＝T yx Properties of =0):
wherein m, n, p, q represent an input plane (m, n) point and an output plane (p, q) point, respectively;
further, the linearly polarized light in the horizontal and vertical polarization directions in the vector beam is focused on a high-order scattering medium (9) through a micro objective lens (8), and then is collected by a micro objective lens (10) and is respectively polarized in the horizontal direction and the vertical direction through a beam splitting prism (11)Polarized linearly polarized light is transmitted in a speckle intensity pattern to CMOS receivers (12, 13) having optical path distances of 80mm and 120mm, respectively, each column of a Hadamard matrix being used as an input pattern, and the elements T are calibrated according to a four-step phase shift method and by measuring the corresponding input pattern xx And T is yy Thereby obtaining the total composition of the Vector Transmission Matrix (VTM) of the higher order scattering medium (9).
Further, by means of conjugate operation on the Vector Transmission Matrix (VTM), the obtained modulated wavefront phase is loaded to the spatial light modulator (2) to overcome the scattering effect of the two orthogonal linearly polarized light beams in the vector light beams passing through the high-order scattering medium (9), and the modulation function of the spatial light modulator (2) is expressed as the following formula three:
wherein γ represents modulation depth, f 0 Representing spatial carrier frequency, delta x And delta y Respectively represent T in VTM xx And T is yy The corresponding Hadamard-based phase, the horizontally polarized linear polarized light and the vertically polarized linear polarized light respectively pass throughAnd->The linear polarized light of the horizontal polarization and the linear polarized light of the vertical polarization of the vector light field can be respectively obtained by focusing at 80mm and 120 mm.
Further, by adding any target phase, such as a distortion phase uxy, to the holographic phase diagram of the spatial light modulator (2), horizontally polarized linear polarized light and vertically polarized linear polarized light can be focused at different distances behind the higher order scattering medium (9), and the modulation function of the spatial light modulator (2) is expressed as the following formula four:
wherein delta 1 ＝uxy，δ 2 ＝-uxy。
Specifically, the light source is a laser source with the wavelength of 532nm, the generation of a target focal dispersion vector vortex light field can be realized through a multi-focal-plane simultaneous focusing system based on orthogonal linear polarized light, and the measurement and calculation of a vector optical transmission matrix based on orthogonal linear polarized light can be realized, so that the adjustment and control of each element in the vector transmission matrix are realized after a high-order scattering medium 9, and the horizontal and vertical polarized light in the vector light field is focused at different positions on focal planes at different distances respectively;
FIG. 2 illustrates the scattered focused beam of the orthogonal linearly polarized light based vector light field generated by this system;
FIG. 3 illustrates that this system is capable of focusing horizontally polarized linearly polarized light (80 mm) and vertically polarized linearly polarized light (120 mm) simultaneously at different distance focal planes in an orthogonal linearly polarized light-based vector light field;
fig. 4 illustrates that this system is capable of focusing horizontally polarized linearly polarized light (80 mm) and vertically polarized linearly polarized light (120 mm) simultaneously at different distance focal planes in an orthogonal linearly polarized light-based vector light field carrying a twisted phase.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the technical solution of the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solution described in the foregoing embodiments may be modified or some of the technical features thereof may be equally substituted; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A scattered multi-focal plane simultaneous focusing system based on orthogonal linear polarized light, comprising:
a laser for emitting laser light and into the 4f system (1);
the 4f system (1) is used for converting orthogonal linearly polarized light and beams into vector light fields and comprises a spatial light modulator (2) for modulating phases, two Fourier lenses (3 and 6), a double-hole filter (4), a double-glued lambda/2 wave plate (5) and a Langmuir grating (7); the Fourier lenses (3, 6) are respectively and correspondingly arranged between the spatial light modulator (2) and the double-hole filter (4) and between the double-glued lambda/2 wave plate (5) and the Langmuir grating (7) in sequence, +1-order light beams of an x axis and a y axis on a spectrum surface after being reflected by the spatial light modulator (2) are extracted through the double-hole filter (4), the two light beams are respectively converted into orthogonal horizontal and vertical polarized light through different glued surfaces of the double-glued lambda/2 wave plate (5), and the orthogonal horizontal and vertical polarized light and the orthogonal vertical polarized light beams are converted into vector light through the Langmuir grating (7);
a high-order scattering medium (9) for scattering the vector light beam passing through;
a microscope objective (8, 10) for scaling speckle generated after the high-order scattering medium (9); the micro objective lens (8) is used for converging the energy of incident light to penetrate through the high-order scattering medium (9), and the micro objective lens (10) for amplifying a target is used for collecting optical signals after penetrating through the high-order scattering medium (9);
a beam splitter prism (11) for splitting the optical signals collected by the microscope objectives (8, 10) into two identical beams of light having mutually perpendicular propagation directions;
the CMOS receivers (12, 13) are used for respectively and correspondingly receiving optical signals of the two beams of light split by the beam splitter prism (11) and transmitting the optical signals to the control device;
wherein, with the 4f system based phase modulation, the generated vector light field is as shown in the following formula one:
wherein A is 0 Is amplitude delta 1 (x, y) and delta 2 (x, y) are respectively applied to the spatial light modulator (2)In the x-direction and the y-direction.
2. A post-scattering multi-focal-plane simultaneous focusing system based on orthogonal linear polarized light as claimed in claim 1, wherein: the vector light field obtained by coherent superposition of two linear polarized lights orthogonal to the horizontal and vertical polarization directions passes through the high-order scattering medium (9), and a Vector Transmission Matrix (VTM) is shown in the following formula II:
where m, n, p, q represent the input plane (m, n) and output plane (p, q) points, respectively.
3. A post-scattering multi-focal-plane simultaneous focusing system based on orthogonal linear polarized light as claimed in claim 2, wherein: the linear polarized light in the horizontal and vertical polarization directions in the vector beam is focused on a high-order scattering medium (9) through a micro objective lens (8), then is collected by a micro objective lens (10) and is transmitted to CMOS receivers (12, 13) with the optical path distances of 80mm and 120mm respectively through a beam splitting prism (11) in a speckle intensity pattern, each column of a Hadamard matrix is used as an input mode, and elements T are calibrated according to a four-step phase shift method and by measuring the corresponding input modes xx And T is yy Thereby obtaining the total composition of the Vector Transmission Matrix (VTM) of the higher order scattering medium (9).
4. A post-scattering multi-focal-plane simultaneous focusing system based on orthogonal linear polarized light as claimed in claim 3, wherein: by means of conjugate operation on the Vector Transmission Matrix (VTM), the obtained modulated wavefront phase is loaded to the spatial light modulator (2) to overcome the scattering effect of two orthogonal linearly polarized light beams in the vector light beams passing through the high-order scattering medium (9), and the modulation function of the spatial light modulator (2) is shown as the following formula III:
wherein γ represents modulation depth, f 0 Representing spatial carrier frequency, delta x And delta y Respectively represent T in VTM xx And T is yy The corresponding Hadamard-based phase, the horizontally polarized linear polarized light and the vertically polarized linear polarized light respectively pass throughAnd->The linear polarized light and the linear polarized light in the vertical polarization direction of the vector light field can be respectively obtained by focusing at 80mm and 120 mm.
5. A post-scattering multi-focal-plane simultaneous focusing system based on orthogonal linear polarized light as claimed in claim 4, wherein: by adding any target phase, such as a distortion phase uxy, to the holographic phase diagram of the spatial light modulator (2), horizontally polarized linearly polarized light and vertically polarized linearly polarized light can be focused at different distance focal planes behind the higher order scattering medium (9), and the modulation function of the spatial light modulator (2) is expressed as follows:
wherein delta 1 ＝uxy，δ 2 ＝-uxy。
6. A post-scattering multi-focal-plane simultaneous focusing system based on orthogonal linear polarized light as claimed in claim 1, wherein: the high-order scattering medium (9) is isotropic ground glass with 220 sand degrees.
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