CN112394528B - High-resolution multicolor beam splitting system and photon filtering method thereof - Google Patents
High-resolution multicolor beam splitting system and photon filtering method thereof Download PDFInfo
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- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
- G02B27/102—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
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- G02B5/284—Interference filters of etalon type comprising a resonant cavity other than a thin solid film, e.g. gas, air, solid plates
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- G—PHYSICS
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- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2746—Optical coupling means with polarisation selective and adjusting means comprising non-reciprocal devices, e.g. isolators, FRM, circulators, quasi-isolators
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Abstract
The invention relates to the technical field of photon frequency filtering, discloses a high-resolution multicolor beam splitting system and a photon filtering method thereof, and solves the problems that no multicolor beam splitter can give consideration to all the technical difficulties at present: the technical problem of high spectral resolution and high extinction ratio comprises a plurality of f beam splitting component units, wherein the f beam splitting component units are arranged in parallel, and each f beam splitting component unit comprises: optical isolator, supplementary light path device and filtering chamber, the mounting structure of f beam splitting subassembly unit is: will the supplementary light path device arrange in filter chamber with between the optoisolator, install optoisolator, supplementary light path device, filter chamber, supplementary light path device, optoisolator, supplementary light path device, filter chamber, supplementary light path device during the installation in proper order, install in proper order according to this. According to the technical scheme, the high-resolution and high-extinction-ratio multi-color beam splitter is designed to adapt to the development of the spectral analysis technology and the market demand.
Description
Technical Field
The invention relates to the technical field of photon frequency filtering, in particular to a high-resolution multicolor beam splitting system and a photon filtering method thereof.
Background
In the fields of material component fine analysis, biological weak light detection, non-classical interference of light and substances and the like, extremely weak signal light is often required to be extracted from background noise photons and separated according to different frequencies. However, the frequencies of many noise photons and useful signal photons are very similar, and the frequencies between different types of signal photons are often very similar, for example, the frequency difference is only several GHz, even only several hundred MHz. At present, commercial spectral analysis instruments cannot compromise high resolution and high extinction ratio. High resolution also tends to mean lower extinction ratios and lower signal-to-noise ratios.
Dense wavelength division multiplexers used in optical communications have frequency separation of tens of GHz, which is not fine enough for the high resolution requirements mentioned above. Flow cytometry techniques used in biomedical applications typically employ a series of dichroic mirrors and filters cascaded to separate the different wavelengths of fluorescence. The frequency division interval between the dichroic mirror and the filter is larger than 1 nanometer, so that the requirement of conventional test can be met, but the requirement of high spectral resolution cannot be met. The spectrum analyzer has extremely high spectral resolution, which can be as high as tens of KHz. However, the spectrum analyzer is based on the beat frequency principle, and requires that the input optical signal has a certain intensity, which is not suitable for analyzing the weaker optical signal. For a conventional grating spectrometer, the frequency division precision is in the order of 0.1 nanometer, and the frequency resolution is at the level of tens of GHz.
Today, our requirements for photon frequency beam splitters are increasing. Not only are higher spectral resolutions required in some applications (such as non-classical interference experiments of light and matter), but extinction ratios higher than several million to one are also required, but polychromatic beam splitters have not been compatible because of various technical difficulties: high spectral resolution and high extinction ratio. It is therefore necessary to design a high resolution, high extinction ratio, polychromatic beam splitter to accommodate the development of spectral analysis techniques and market demands.
Disclosure of Invention
In view of the technical difficulties presented in the background art, there is no polychromatic beam splitter that can compromise: the invention relates to a high-spectral resolution and high-extinction ratio multi-color beam splitter, which is designed to adapt to the development of a spectral analysis technology and the market demand.
In order to achieve the purpose, the invention provides the following technical scheme:
high-resolution polychrome beam splitting system, including a plurality of f beam splitting component units, set up side by side between a plurality of f beam splitting component units, f beam splitting component unit includes:
the optical isolator allows light beams to pass through in a single direction, and plays a role in eliminating interference and cascading f beam splitting component units;
the auxiliary light path device is of a lens structure and plays a role in transverse mode matching of light beams;
the filter cavity is of a solid cylinder structure, the front surface of the filter cavity is a spherical surface, the rear surface of the filter cavity is a plane, and the front surface and the rear surface are plated with high-reflectivity reflection increasing films;
the temperature control module is used for actively adjusting and locking the temperature of the filtering cavity;
the mounting structure of the f beam splitting component unit is as follows: will the supplementary light path device arrange in filter chamber with between the optoisolator, install optoisolator, supplementary light path device, filter chamber, supplementary light path device, optoisolator, supplementary light path device, filter chamber, supplementary light path device during the installation in proper order, install in proper order according to this.
Through the technical scheme, the filter cavity designed and manufactured by the invention belongs to a Fabry-Perot cavity, is like a plano-convex glass lens in appearance, and the front surface and the rear surface are plated with high-reflectivity reflection increasing films. Relative to the Fabry-Perot cavity with the front and back surfaces parallel, the plano-convex filtering cavity manufactured by the invention not only has a frequency filtering function, but also has a spatial mode filtering function. In addition, compared with a filter cavity formed by two independent reflectors, the integrated block cavity does not need extra light beams and a phase locker for phase locking to lock the space distance of the two reflectors, so that the light path debugging difficulty is greatly reduced. The cavity length (different cavity lengths correspond to different transmission frequencies) of the filtering cavity adopted by the invention can be adjusted and locked by the temperature control module. By cascading a plurality of such plano-convex filter cavities, not only can separation between photons of various frequencies (e.g., four: f1, f2, f3, f4) and separation from noise photons be achieved, but also an extinction ratio of hundreds of thousands to one, or even hundreds of thousands to one (which is related to the number of cascaded filter cavities).
The auxiliary light path device mainly realizes transverse mode matching of the light beam. The transverse mode matching adopts a method of selecting a proper lens to transform an input light beam so as to realize the resonant mode matching of the transverse mode of the signal light and the filter cavity. The signal light matching the filter cavity resonance mode can be transmitted and the noise photons not matching the filter cavity resonance mode will be reflected.
The isolator mainly realizes interference elimination and cascade connection of a plurality of f beam splitting component units. Interference cancellation refers to the elimination of interference caused by the back and forth reflection of a light beam between two filter cavities, which otherwise would seriously affect the transmittance and extinction ratio of the entire filter system. The invention can eliminate the interference of light beams between the cavities by utilizing the self-made optical isolator. Cascading multiple f-beam splitting assembly units refers to: the signal beam which cannot pass through the f1 beam splitting unit is reflected by the f1 beam splitting unit, then travels backward to meet the first isolator 100 of the f1 unit, and exits from the side outlet of the isolator 100 to enter the f2 beam splitting unit. And the like, and the optical fiber enters the f3 beam splitting unit and the f4 beam splitting unit in sequence.
A temperature control module: the temperature of the filter cavity is actively adjusted and locked to adjust and lock the cavity length of the filter cavity, so that the filter cavity is adjusted and locked to be matched with the longitudinal mode of the signal light (namely, the frequency is equal), and the purpose that the signal light can penetrate through the filter cavity and noise photons are reflected by the filter cavity is achieved. The temperature control module is based on the PID automatic feedback principle, the stability of temperature control is +/-3 mK, and the typical value is +/-1 mK.
The chassis includes: optical panel, protective housing, vibration damping mount. The optical path of the filtering system is built on an optical panel. The protective shell is used for protecting the light path from collision and can improve the temperature stability of the whole system. Vibration of the damping base above 50Hz can be effectively isolated, and the stability of a light path is guaranteed.
The invention is further configured to: the f beam splitting assembly unit is provided with four groups, namely an f1 beam splitting assembly, an f2 beam splitting assembly, an f3 beam splitting assembly and an f4 beam splitting assembly.
The invention is further configured to: the first of the optical isolators within the f4 splitter assembly provides a noise vent.
Through the technical scheme, not only can the separation of photons with various frequencies (four types: f1, f2, f3 and f4) and the separation of noise photons be realized, but also the extinction ratio of hundreds of thousands to one or even thousands to one (which is related to the number of the cascaded filter cavities) can be realized by cascading a plurality of the planoconvex filter cavities.
The invention is further configured to: more than two groups of optical isolators are arranged in the single f-beam splitting component unit.
The invention is further configured to: four or more sets of the auxiliary optical path devices in a single f-beam splitting assembly unit are provided.
The invention is further configured to: more than two groups of filter cavities are arranged in the single f beam splitting assembly unit.
Based on the high-resolution multicolor beam splitting system, a photon filtering method is provided, which comprises the following steps:
the method comprises the following steps: designing, manufacturing and installing a case;
step two: designing, processing and installing a filter cavity;
step three: optimizing PID parameters of each filtering cavity temperature control module;
step four: building a filter cavity and an auxiliary light path inside a case, and cascading each frequency channel by using an optical isolator;
step five: optimizing the transmittance and extinction ratio of each frequency channel;
step six: finely correcting the temperature of each filter cavity;
step seven: the signal light is collected to an input optical fiber of the multi-color beam splitting system, and pure signal light is obtained from an output optical fiber.
Through the technical scheme, the technical effects are as follows: the spectrum application range of the system and the method is 350nm to 1700nm, namely the wavelength can be customized; the spectral resolution can be customized in the range of 50MHz to 100 GHz; the bandwidth of a single frequency channel may be customized in the range of 10MHz to 3 GHz. Each frequency channel of the present inventive polychromatic beam-splitting system can be simultaneously implemented 107An extinction ratio of 1 and a total transmittance of about 70%. The light isolator designed and manufactured by the invention has the transmittance of about 98 percent, and the total transmittance of the beam splitting system is ensured. Description of the actual effects: the invention has approached the optimal mode matching of the filter cavity; the optical isolator effectively inhibits the interference between the cavities on the premise of extremely high transmittance. The temperature fluctuation of the filter cavity is +/-3 mK, the typical value is +/-1 mK, and the stability of the frequency window of the high-resolution multicolor beam splitting system is ensured.
The invention is further configured to: an optical isolator, an auxiliary light path device, a filtering cavity, an auxiliary light path device, an optical isolator, an auxiliary light path device, a filtering cavity and an auxiliary light path device are sequentially arranged in the case to form an f beam splitting component unit.
The invention is further configured to: when in construction, the number of the optical isolator, the auxiliary optical path device and the filter cavity is increased or reduced according to the actual use condition; the number of the f beam splitting assembly units is increased or decreased according to the actual use condition during construction, namely the number of the frequency channels is increased or decreased.
In conclusion, the invention has the following beneficial effects:
(1) designing a high-resolution and high-extinction-ratio multicolor beam splitter to adapt to the development of spectral analysis technology and market requirements;
(2) each frequency channel of the polychromatic beam-splitting system of the present item can be simultaneously implemented 107The extinction ratio of 1 and the total transmittance of about 70 percent, the transmittance of the optical isolator designed and manufactured by the invention is about 98 percent, and the total transmittance of a beam splitting system is ensured.
Drawings
Fig. 1 is a schematic perspective view of a chassis;
FIG. 2 is a schematic side view of the housing;
FIG. 3 is a schematic diagram of a filter chamber;
FIG. 4 is a schematic diagram of a high-resolution multi-color beam splitting system;
fig. 5 is a flow chart of a photon frequency filtering method.
Reference numerals: 100. an optical isolator; 200. an auxiliary optical path device; 300. a filter cavity; 400. a chassis; 401. an optical panel; 402. a protective housing; 403. shock mount.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the embodiments of the present invention are not limited thereto.
The high-resolution multicolor beam splitting system comprises a plurality of f beam splitting component units, wherein the f beam splitting component units are four groups and are respectively an f1 beam splitting component, an f2 beam splitting component, an f3 beam splitting component and an f4 beam splitting component, an f1 beam splitting component, an f2 beam splitting component, an f3 beam splitting component and an f4 beam splitting component are arranged in parallel, and the f4 beam splitting component provides a noise outlet. Specifically, the f beam splitting assembly unit includes: optical isolator 100, auxiliary optical path component 200, filter cavity 300 and temperature control module.
As can be seen from fig. 3 and 4, the mounting structure of the f beam splitting assembly unit is: the auxiliary optical path device 200 is placed between the filter cavity 300 and the optical isolator 100, the auxiliary optical path device 200, the filter cavity 300, the auxiliary optical path device 200, the optical isolator 100, the auxiliary optical path device 200, the filter cavity 300, and the auxiliary optical path device 200 are sequentially installed during installation, and are sequentially installed according to the sequence.
The filter cavity 300 designed and manufactured by the invention belongs to one of Fabry-Perot cavities, is like a plano-convex glass lens in appearance, and is plated with high-reflectivity reflection increasing films on the front and rear surfaces. Relative to the fabry-perot cavity with parallel front and back surfaces, the plano-convex filter cavity 300 manufactured by the invention not only has a frequency filtering function, but also has a spatial mode filtering function. In addition, compared with the filter cavity 300 formed by two independent reflectors, the integrated block cavity does not need extra light beams and phase lockers for phase locking to lock the space distance of the two reflectors, so that the difficulty in debugging the light path is greatly reduced. The cavity length (different cavity lengths correspond to different transmission frequencies) of the filter cavity 300 adopted by the invention can be adjusted and locked by the temperature control module. By cascading a plurality of such plano-convex filter cavities 300, not only separation between photons of various frequencies (four: f1, f2, f3, f4) and separation from noise photons, but also an extinction ratio of hundreds of thousands to one, or even thousands to one (which is related to the number of cascaded filter cavities 300) can be achieved.
The auxiliary optical path device 200 mainly achieves beam transverse mode matching. The transverse mode matching adopts a method of selecting a proper lens to transform the input light beam so as to realize the transverse mode matching of the signal light and the resonance mode of the filter cavity 300. Signal light that matches the resonant mode of the filter cavity 300 can pass through and noise photons that do not match the resonant mode of the filter cavity 300 will be reflected.
A temperature control module: according to the invention, the temperature of the filter cavity 300 is actively adjusted and locked to adjust and lock the cavity length of the filter cavity 300, so that the longitudinal mode matching (namely, the frequency is equal) of the filter cavity 300 and the signal light is adjusted and locked, and the purpose that the signal light can penetrate through the filter cavity 300 and noise photons are reflected by the filter cavity 300 is realized. The temperature control module is based on the PID automatic feedback principle, the stability of temperature control is +/-3 mK, and the typical value is +/-1 mK.
In each f-beam splitting assembly unit, the optical isolator 100 is provided with two or more groups, the auxiliary optical path devices 200 are provided with four or more groups, and the filter cavity 300 is provided with two or more groups.
Based on the high-resolution multicolor beam splitting system, when a test environment is built and used, a photon filtering method is combined with the method shown in fig. 5, and comprises the following steps:
the method comprises the following steps: referring to fig. 1 and 2, the design, fabrication, and installation of a chassis 400, the chassis 400 comprising: optical panel 401, protective housing 402, shock mount 403. The optical path of the present filtering system is built on the optical panel 401. The protective housing 402 serves to protect the optical path from impact and can improve the temperature stability of the entire system. The damping base 403 can effectively isolate vibration above 50Hz, so that the stability of a light path is ensured;
step two: the design, fabrication, and installation of the filter cavity 300;
step three: optimizing PID parameters of the temperature control modules of the filter cavities 300;
step four: the filtering cavity 300 and the auxiliary light path are built inside the case 400, the optical isolator 100, the auxiliary light path device 200, the filtering cavity 300, the auxiliary light path device 200, the optical isolator 100, the auxiliary light path device 200, the filtering cavity 300 and the auxiliary light path device 200 are sequentially installed in the case 400 to form an f beam splitting component unit, and the number of the optical isolators 100, the auxiliary light path devices 200 and the number of the filtering cavities 300 are increased or reduced according to actual use conditions during building. And cascade-connecting each frequency channel by using the optical isolator 100; and when the frequency splitting module is built, the number of the f beam splitting module units is increased or reduced according to the actual use condition, namely the number of the frequency channels is increased or reduced.
Step five: optimizing the transmittance and extinction ratio of each frequency channel;
step six: the temperature of each filter chamber 300 is finely corrected;
step seven: the signal light is collected to an input optical fiber of the multi-color beam splitting system, and pure signal light is obtained from an output optical fiber.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiments, and all technical solutions that belong to the idea of the present invention belong to the scope of the present invention. It should be noted that modifications and adaptations to those skilled in the art without departing from the principles of the present invention should also be considered as within the scope of the present invention.
Claims (9)
1. High-resolution polychrome beam splitting system, its characterized in that includes a plurality of f beam splitting component units, sets up side by side between a plurality of f beam splitting component units, f beam splitting component unit includes:
an optical isolator (100), said optical isolator (100) allowing unidirectional passage of a light beam, functioning as an interference cancellation and cascading f-beam splitting component units;
the auxiliary light path device (200), the auxiliary light path device (200) is a lens structure and plays a role in transverse mode matching of the light beam;
the filter cavity (300) is of a solid cylinder structure, the front surface of the filter cavity (300) is a spherical surface, the rear surface of the filter cavity (300) is a plane, and the front surface and the rear surface are plated with high-reflectivity reflection increasing films;
a temperature control module that actively regulates and locks the temperature of the filter chamber (300);
the mounting structure of the f beam splitting component unit is as follows: the auxiliary optical path device (200) is arranged between the filter cavity (300) and the optical isolator (100), the auxiliary optical path device (200), the filter cavity (300), the auxiliary optical path device (200), the optical isolator (100), the auxiliary optical path device (200), the filter cavity (300) and the auxiliary optical path device (200) are sequentially installed during installation, and the optical isolators are sequentially installed according to the sequence, wherein the first optical isolator (100) of the f beam splitting component units is provided with a lateral outlet.
2. The high-resolution polychromatic beam-splitting system according to claim 1, characterized in that: the f beam splitting assembly unit is provided with four groups, namely an f1 beam splitting assembly, an f2 beam splitting assembly, an f3 beam splitting assembly and an f4 beam splitting assembly.
3. The high resolution polychromatic beam splitter system according to claim 2, wherein: the first of the optical isolators (100) within the f4 beam splitter assembly provides a noise vent.
4. The high-resolution polychromatic beam-splitting system according to claim 1, characterized in that: the optical isolators (100) in a single f-beam splitting assembly unit are provided in two or more groups.
5. The high-resolution polychromatic beam-splitting system according to claim 1, characterized in that: four sets and more of the auxiliary optical path devices (200) in a single f-beam splitting assembly unit are provided.
6. The high resolution polychromatic beam splitter system according to claim 1, wherein: more than two groups of filter cavities (300) are arranged in a single f beam splitting assembly unit.
7. The high-resolution polychromatic beam-splitting system according to any one of claims 1 to 6, wherein a photon filtering method is proposed, comprising the following steps:
the method comprises the following steps: designing, manufacturing and installing a case (400);
step two: design, machining and installation of the filter cavity (300);
step three: optimizing PID parameters of the temperature control modules of the filter cavities (300);
step four: a filtering cavity (300) and an auxiliary light path are built in a case, and all frequency channels are cascaded by using a light isolator (100);
step five: optimizing the transmittance and extinction ratio of each frequency channel;
step six: finely correcting the temperature of each filter chamber (300);
step seven: the signal light is collected to the input optical fiber of the multi-color beam splitting system, and pure signal light is obtained from the output optical fiber.
8. The method for filtering photons of claim 7, wherein the optical isolator (100), the auxiliary optical circuit device (200), the filter cavity (300), the auxiliary optical circuit device (200), the optical isolator (100), the auxiliary optical circuit device (200), the filter cavity (300) and the auxiliary optical circuit device (200) are sequentially installed in the housing (400) to form an f-splitter component unit.
9. A photon filtering method according to claim 7, wherein the number of the f-beam splitting assembly units is increased or decreased, that is, the number of the frequency channels is increased or decreased, according to the actual use condition.
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| CN1651947A (en) * | 2004-02-02 | 2005-08-10 | 中国科学技术大学 | Polarization control coding method coder and quantum key distributing system |
| US7403336B2 (en) * | 2006-10-30 | 2008-07-22 | Applied Materials, Israel, Ltd. | Broadband imaging system and method |
| JP5218243B2 (en) * | 2009-04-17 | 2013-06-26 | 日本電気株式会社 | Optical module |
| IL221187A (en) * | 2012-07-30 | 2017-01-31 | Adom Advanced Optical Tech Ltd | System for performing dual beam, two-dimensional optical coherence tomography (oct) |
| CN102789054A (en) * | 2012-07-31 | 2012-11-21 | 江苏大学 | One-dimensional photonic crystal double-prism defect dispersion separator |
| CN203422496U (en) * | 2013-09-18 | 2014-02-05 | 福州高意通讯有限公司 | Transmitter wavelength division multiplexing optical structure and optical transmitter module |
| CN103887710A (en) * | 2014-03-04 | 2014-06-25 | 维林光电(苏州)有限公司 | Laser multi-beam combining device and method thereof |
| US10241337B2 (en) * | 2016-05-27 | 2019-03-26 | Verily Life Sciences Llc | Tunable spectral slicer and methods of use |
| US10642056B2 (en) * | 2016-10-19 | 2020-05-05 | CSEM Centre Suisse d'Electronique et de Microtechnique SA—Recherche et Développement | Multispectral or hyperspectral imaging and imaging system based on birefringent subwavelength resonating structure |
| CN107678223B (en) * | 2017-11-14 | 2019-12-10 | 山西大学 | Device capable of quickly adjusting continuous variable entanglement source signal light interference |
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