CN112255857A - Interference enhancement up-conversion imaging device - Google Patents
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- CN112255857A CN112255857A CN202011119048.6A CN202011119048A CN112255857A CN 112255857 A CN112255857 A CN 112255857A CN 202011119048 A CN202011119048 A CN 202011119048A CN 112255857 A CN112255857 A CN 112255857A
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Abstract
The application provides an interference enhancement up-conversion imaging device, includes: the device comprises a beam splitter, a reflector, a two-dimensional image up-converter, a reference light up-converter, a phase modulator, a dichroic mirror and a photoelectric detector; the beam splitter is used for splitting the light emitted by the laser into two beams, one beam is used as signal light, and the other beam is used as reference light; a mirror for changing the direction of propagation of the light path in the device; a two-dimensional image upconverter for implementing high spatial resolution frequency upconversion of a two-dimensional image by increasing the size of a laser mode in a nonlinear crystal; the reference light up-converter is used for enhancing the intensity of the pump light through the external cavity to realize the conversion of the high conversion efficiency of the reference light; a phase modulator for adjusting a phase of the up-converted signal light; a dichroic mirror for combining the up-converted signal light and the up-converted reference light; and the photoelectric detector is used for detecting the two-dimensional up-conversion image after the interference enhancement. Thereby realizing two-dimensional image up-conversion with high conversion efficiency and high spatial resolution.
Description
Technical Field
The application relates to the field of frequency up-conversion imaging, in particular to an interference enhancement frequency up-conversion imaging device.
Background
Infrared or near infrared, especially low loss transmission windows of optical fibers and atmosphere at the photon wavelength of the optical communication band, has wide application in biomedical imaging, defense and military, gas analysis and quantum information fields. The most advanced direct infrared detectors at present are thermal sensors, semiconductor detectors or superconducting nanowire detectors. The heat sensor has low cost, and can only be used in occasions with low requirements on precision and speed due to low response speed and low sensitivity; the semiconductor detector has high sensitivity, but needs cooling operation and precise processing; the superconducting nanowire detector has the characteristics of high sensitivity and quick response, but works at extremely low temperature of several mK to K, and the cost is high.
Compared with the prior art, the single photon detection devices (Si-APDs, PMTs) and the CCD sensor in the visible light wave band have the characteristics of high quantum efficiency, low dark count and fast response. Therefore, an up-conversion technique for effectively up-converting the mid-and near-infrared light into visible light and detecting the visible light by using a high-performance detector of the visible light is an effective means for replacing a direct infrared imaging technique.
Infrared up-conversion imaging is the use of nonlinear optics sum-frequency processes to up-convert an image of infrared illumination into the visible spectrum while keeping its quantum properties unchanged, and then imaging with better performing image sensors in the visible spectrum range. Compared with the existing imaging sensor in the infrared spectrum range and the THz region, the up-conversion imaging technology can obtain a real-time and full non-scanning two-dimensional image. The method fully utilizes the better performance of the visible light wave band image sensor in the aspects of noise, speed, resolution or non-refrigeration operation, overcomes the defects of high dark noise, refrigeration requirement and the like of the infrared image sensor, and can realize high-sensitivity and high-resolution imaging of the infrared image.
The field of view, the spatial resolution and the up-conversion efficiency of the two-dimensional image are key indexes for evaluating the quality of the infrared up-conversion imaging technology.
Currently, effective methods for enhancing the up-conversion imaging field of view mainly include broadband light sources, crystal thermal gradients, crystal rotation, and the like. The broadband light source realizes quasi-phase matching of more angles by utilizing wavelength sensitivity of an up-conversion angle in non-collinear interaction, so that the field of view of a two-dimensional image is enlarged, however, compared with a monochromatic laser source, the brightness of an illumination target of the broadband light source is reduced, and the broadband light source is not beneficial to a medium-distance and long-distance system. Crystalline thermal gradients the mechanism that effectively enhances the field of view of an upconverted image when illuminated with a single wavelength source, by introducing a thermal gradient formed by hot and cold electrodes across the PPLN crystal to cause a gradient in the refractive index of the crystal, thereby causing a mismatch in the wave vectors of the interacting waves, has the disadvantage that non-uniformity in the thermal distribution in the crystal will lead to a reduction in the upconversion efficiency.
The resolution of the upconverted image is proportional to the size of the modes in the nonlinear crystal and the upconversion efficiency is inversely proportional to the mode size, i.e. the beam size of the pump light in the crystal determines the spatial resolution of the image upconversion system and the intensity of the pump light determines the conversion efficiency of the image upconversion. In practical applications, high conversion efficiency and high spatial resolution cannot be simultaneously considered in the up-conversion process of the two-dimensional image. The only way to enhance the spatial resolution of image up-conversion is to use incoherent light source, however the incoherent source object illumination brightness is reduced, resulting in reduced conversion efficiency of the up-converted image. A commonly used method to increase the efficiency of image up-conversion is to increase the power of the pump light by means of intra-cavity pumping and external cavity enhancement, but the complex cavity structure leads to a reduced spatial resolution of the up-converted image.
Disclosure of Invention
In view of the above, an object of the embodiments of the present application is to provide an interference-enhanced image up-conversion device, which obtains an enhanced two-dimensional target image by utilizing interference of up-conversion reference light with high conversion efficiency and up-conversion signal light with high spatial resolution, thereby implementing interference-enhanced up-conversion imaging with high spatial resolution and high conversion efficiency.
In a first aspect, an object of an embodiment of the present application is to provide an interference-enhanced image upconverter, which includes a beam splitter, a mirror, a two-dimensional image upconverter, a reference light upconverter, a phase modulator, a dichroic mirror, and a photodetector;
the beam splitter is used for splitting the light emitted by the laser into two beams, one beam is used as signal light to illuminate a standard resolution target, and the other beam is used as reference light;
the reflector is used for changing the propagation direction of the light path in the device;
the two-dimensional image up-converter is used for high-spatial-resolution frequency up-conversion of the two-dimensional image;
the reference light up-converter is used for up-converting the reference light with high conversion efficiency;
the phase modulator is used for adjusting the phase of the two-dimensional image after the up-conversion;
the dichroic mirror is used for combining the up-conversion two-dimensional image and the up-conversion reference light;
and the photoelectric detector is used for detecting the two-dimensional up-conversion image after the interference enhancement.
With reference to the first aspect, embodiments of the present application provide a first possible implementation manner of the first aspect, where the two-dimensional image upconverter includes a target mask, a dichroic mirror, a focusing lens, a nonlinear crystal, a collimating lens, and a filter;
the target mask is used for irradiating the signal light split by the beam splitter to form a two-dimensional target image;
the dichroic mirror is used for combining the signal light carrying the two-dimensional target image and the pump light;
the focusing lens is used for focusing the two-dimensional image and the pump light to the center of the nonlinear crystal;
the nonlinear crystal is a nonlinear medium for realizing up-conversion of a two-dimensional image;
the collimating lens is used for collimating the up-converted two-dimensional image;
and the filter is used for filtering out wavelengths except the up-conversion spectrum.
With reference to the first aspect, this application provides a second possible implementation manner of the first aspect, where the reference light upconverter includes a dichroic mirror, an input coupling lens, a resonator input cavity mirror, a nonlinear crystal, a resonator output cavity mirror, an output coupling lens, and a filter;
the dichroic mirror is used for combining the reference light and the pump light;
the input coupling lens is used for focusing the combined reference light and the pump light to the center of the nonlinear crystal;
the resonant cavity input cavity mirror is used for coupling the combined reference light and the pump light into the resonant cavity;
the nonlinear crystal is used for providing a working medium for nonlinear frequency conversion;
the resonant cavity output cavity mirror is used for outputting the up-converted sum frequency light and forms an enhanced cavity with the resonant cavity input cavity mirror to enhance the power of the pump light;
the output coupling lens is used for collimating the output up-conversion sum-frequency light;
and the filter is used for filtering out the spectrum except the up-converted reference light.
The interference-enhanced up-conversion imaging device provided by the embodiment of the application comprises a beam splitter 11, a two-dimensional image up-converter 12, a reflecting mirror 13, a phase modulator 14, a reflecting mirror 15, a reference light up-converter 16, a dichroic mirror 17 and a photoelectric detector 18. Compared with the prior image up-conversion technology which cannot obtain high conversion efficiency and high spatial resolution at the same time, the image up-conversion technology divides light emitted by a laser into two beams of signal light and reference light through a beam splitter, the signal light illuminates a target mask to form a two-dimensional target image, and the frequency up-conversion of the high spatial resolution is realized in a two-dimensional image up-converter by increasing the size of a laser mode in a nonlinear crystal; the reference light is converted in the frequency up-converter with high efficiency by enhancing the pump light power through the external cavity. The quantum characteristics of the signal light and the reference light are not changed in the up-conversion process, so that the up-converted signal light and the reference light meet the coherence condition, and the up-converted signal light and the up-converted reference light are combined by the dichroic mirror and interfere with each other, so that the up-conversion two-dimensional image with high conversion efficiency and high spatial resolution is obtained.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 shows a schematic structural diagram of an interference enhanced up-conversion imaging device provided by an embodiment of the present application;
fig. 2 is a schematic diagram illustrating a specific structure of a two-dimensional image up-converter 12 in an interference enhanced up-conversion imaging apparatus provided in an embodiment of the present application;
FIG. 3 is a schematic diagram showing a specific structure of a reference light up-converter 16 in an interference enhanced up-conversion imaging device according to an embodiment of the present application;
description of the main element symbols:
11. a beam splitter; 12. a two-dimensional image up-converter; 13. a mirror; 14. a phase modulator; 15. a mirror; 16. a reference light up-converter; 17. a dichroic mirror; 18. a photodetector; 121 a target mask; 122. a dichroic mirror; 123. a focusing lens; 124. periodically polarizing the crystal; 125. a collimating lens; 126. a first filter; 161. a dichroic mirror; 162. an input coupling lens; 163. a resonant cavity input cavity mirror; 164. a nonlinear crystal; 165. an output cavity mirror of the resonant cavity; 166. an output coupling lens; 167. a second filter.
Detailed Description
To make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
In view of the fact that the existing frequency upconversion imaging technology cannot achieve high conversion efficiency and spatial resolution at the same time, embodiments of the present application provide an interference enhanced upconversion imaging device, which will be described in detail in the following embodiments.
As shown in fig. 1, an embodiment of the present application provides an interference enhanced frequency up-conversion imaging apparatus, which specifically includes: a beam splitter 11, a two-dimensional image up-converter 12, a mirror 13, a phase modulator 14, a mirror 15, a reference light up-converter 16, a dichroic mirror 17, and a photodetector 18;
the beam splitter 11 is used for splitting the light emitted by the laser into two beams, one beam is used as signal light to illuminate a standard resolution target, and the other beam is used as reference light;
a two-dimensional image up-converter 12 for up-converting a two-dimensional image with high spatial resolution, which is achieved by increasing the size of the laser mode in the nonlinear crystal;
a mirror 13 for changing the propagation direction of the upconverted light;
a phase modulator 14 for modulating a phase of the up-converted image;
a mirror 15 for changing the propagation direction of the reference light;
a reference light up-converter 16 for up-conversion of reference light with high conversion efficiency achieved by external cavity enhancement of the intensity of the pump light;
a dichroic mirror 17 for combining the upconverted signal light and the upconverted reference light;
a detector 18 for detecting the interference enhanced up-converted image.
The interference-enhanced up-conversion imaging device provided by the embodiment of the application comprises a beam splitter 11, a two-dimensional image up-converter 12, a reflecting mirror 13, a phase modulator 14, a reflecting mirror 15, a reference light up-converter 16, a dichroic mirror 17 and a photoelectric detector 18. Compared with the prior image up-conversion technology which cannot obtain high conversion efficiency and high spatial resolution at the same time, the image up-conversion technology divides light emitted by a laser into two beams of signal light and reference light through a beam splitter, the signal light illuminates a target mask to form a two-dimensional target image, and frequency up-conversion with high spatial resolution is realized in a two-dimensional image up-converter; the reference light is frequency up-converted in a reference light up-converter with high efficiency. The quantum characteristics of the signal light and the reference light are not changed in the up-conversion process, so that the up-converted signal light and the reference light meet the coherence condition, and the up-converted signal light and the up-converted reference light are combined by the dichroic mirror and interfere with each other, so that the up-conversion two-dimensional image with high conversion efficiency and high spatial resolution is obtained.
As shown in fig. 2, the two-dimensional image up-converter 12 in the present embodiment specifically includes: a target mask 121, a dichroic mirror 122, a focusing lens 123, a nonlinear crystal 124, a collimating lens 125, a filter 126; wherein:
a target mask 121 for forming a two-dimensional target image by the signal light irradiation split by the beam splitter 11;
a dichroic mirror 122 for combining the signal light carrying the two-dimensional target image and the pump light;
a focusing lens 123 for focusing the two-dimensional image and the pump light to the center of the nonlinear crystal 124;
a nonlinear crystal 124 for realizing a nonlinear medium for two-dimensional image up-conversion;
a collimating lens 125 for collimating the up-converted two-dimensional image;
and a filter 126 for filtering out wavelengths outside the up-converted spectrum.
In the two-dimensional image upconverter 12 of the present embodiment, the larger the laser mode in the nonlinear crystal is, the higher the resolution of the upconverted image is, and the lower the upconversion efficiency is. Higher spatial resolution is obtained by increasing the size of the modes of the signal light and the pump light in the crystal,
as shown in fig. 3, the reference light up-converter 16 in the present embodiment specifically includes: dichroic mirror 161, input coupling lens 162, resonator input cavity mirror 163, nonlinear crystal 164, resonator output cavity mirror 165, output coupling lens 166, and filter 167.
A dichroic mirror 161 for combining the reference light and the pump light into a beam;
the input coupling lens 162 is used for focusing the combined reference light and the pump light to the center of the nonlinear crystal;
the resonant cavity input cavity mirror 163 is used for coupling the combined reference light and the pump light into the resonant cavity;
a nonlinear crystal 164 for providing a nonlinear frequency-converted working medium;
a resonant cavity output cavity mirror 165 for outputting the up-converted sum-frequency light, and forming a reinforced cavity with the resonant cavity input cavity mirror 163 to reinforce the power of the pump light;
an output coupling lens 166 for collimating the output upconverted and frequency light;
and a filter 167 for filtering out a spectrum other than the upconverted sum frequency light.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working process of the method described above may refer to the corresponding process in the foregoing device embodiment, and is not described herein again.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (3)
1. An interference enhanced up-conversion imaging device is characterized by comprising a beam splitter, a reflecting mirror, a two-dimensional image up-converter, a reference light up-converter, a phase modulator, a first dichroic mirror and a photoelectric detector;
the beam splitter is used for splitting the light emitted by the laser into two beams, one beam is used as signal light to illuminate a standard resolution target to form a two-dimensional image, and the other beam is used as reference light;
the reflector is used for changing the propagation direction of the light path in the device;
the two-dimensional image up-converter is used for realizing two-dimensional image up-conversion;
the reference light up-converter is used for up-converting the reference light into up-converted reference light consistent with the signal light wavelength, and obtaining the up-converted reference light with the conversion efficiency higher than 50% in a mode of enhancing the pump light by an external cavity;
the phase modulator is used for modulating the phase of the two-dimensional image subjected to up-conversion of the up-conversion signal light;
the first dichroic mirror is used for combining the up-converted two-dimensional image with the reference light and combining the up-converted reference light with the up-converted reference light;
and the photoelectric detector is used for detecting the two-dimensional up-conversion image after the interference enhancement.
2. The apparatus of claim 1, wherein the two-dimensional image up-converter comprises a target mask, a second dichroic mirror, a focusing lens, a first nonlinear crystal, a collimating lens, a first filter;
the target mask is used for forming a two-dimensional image by the signal light irradiation split by the beam splitter;
the second dichroic mirror is used for combining the signal light carrying the two-dimensional image and the pump light;
the focusing lens is used for focusing the two-dimensional image and the pump light to the center of the first nonlinear crystal;
the first nonlinear crystal is a nonlinear medium for realizing up-conversion of a two-dimensional image;
the collimating lens is used for collimating the up-converted light beam;
and the first filter is used for filtering out wavelengths except the up-conversion spectrum.
3. The apparatus of claim 1, wherein the reference light upconverter comprises a third dichroic mirror, an input coupling lens, a resonator input cavity mirror, a second nonlinear crystal, a resonator output cavity mirror, an output coupling lens, a second filter;
the third dichroic mirror is used for combining the reference light and the pump light into beams;
the input coupling lens is used for focusing the combined reference light and the pump light to the center of the second nonlinear crystal;
the resonant cavity input cavity mirror is used for coupling the combined reference light and the pump light into the resonant cavity;
the second nonlinear crystal is used for providing a working medium for nonlinear frequency conversion;
the resonant cavity output cavity mirror is used for outputting the up-converted sum-frequency light and forms the power of the external cavity enhanced pump light with the resonant cavity input cavity mirror;
the output coupling lens is used for collimating the output up-conversion sum-frequency light;
and the second filter is used for filtering out the spectrum except the up-converted reference light.
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|---|---|---|---|---|
| CN101915915A (en) * | 2010-07-19 | 2010-12-15 | 北京航空航天大学 | Method for correcting phase of optical frequency conversion-based coherent imaging system in real time |
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| CN108199776A (en) * | 2018-02-08 | 2018-06-22 | 吉林大学 | A kind of microwave photon means of upconversion and method based on optical-electronic oscillator |
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| CN101915915A (en) * | 2010-07-19 | 2010-12-15 | 北京航空航天大学 | Method for correcting phase of optical frequency conversion-based coherent imaging system in real time |
| CN105242280A (en) * | 2014-07-08 | 2016-01-13 | 中国科学院理化技术研究所 | Correlated imaging device and correlated imaging method based on optical parametric process |
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