CN113325614B - Narrow-band filtering device and method based on filtering medium - Google Patents
Narrow-band filtering device and method based on filtering medium Download PDFInfo
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- CN113325614B CN113325614B CN202110526299.4A CN202110526299A CN113325614B CN 113325614 B CN113325614 B CN 113325614B CN 202110526299 A CN202110526299 A CN 202110526299A CN 113325614 B CN113325614 B CN 113325614B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/288—Filters employing polarising elements, e.g. Lyot or Solc filters
Abstract
The invention belongs to the technical field of photoelectronics, and particularly relates to a narrow-band filtering device and a method based on a filtering medium, wherein the device comprises a filtering adjusting device; the filtering adjusting device comprises a U-shaped sliding chute, a filtering medium frame and a main rotating shaft; the bottom of the U-shaped chute is sleeved on the main rotating shaft and the direction is fixed through a fastening screw; an upper guide rail and a lower guide rail are arranged in the U-shaped sliding groove, an adjusting nut is arranged on the outer side of the U-shaped sliding groove, a gear connected with the adjusting nut is arranged on the inner side of the U-shaped sliding groove, and gear meshing grooves matched with the gear are formed in the upper surface of the lower guide rail and the lower surface of the upper guide rail; the upper guide rail and the lower guide rail are respectively provided with a first magnet and a second magnet; the filter medium frame is fixedly arranged on the main rotating shaft and used for arranging and selecting a required filter medium air chamber; and the filter medium frame is provided with a heating sheet, and the heating sheet is used for heating the filter medium air chamber. The invention has the advantages of wide covering wavelength, good filtering effect, high integration level, real-time detection, easy use and the like.
Description
Technical Field
The invention belongs to the technical field of photoelectron, and particularly relates to a narrow-band filtering device and a method based on a filtering medium, which can realize a method and a device for filtering a plurality of narrow bands with specific wavelengths.
Background
In many photodetection systems, there are increasing demands on background light interference suppression and on detection of frequency variations of signal light. High resolution optics such as interference filters, birefringent crystal filters, and fabry-perot interferometers are commonly used to achieve the selection and discrimination of optical frequencies.
The traditional filter device is an interference filter, the method can only realize the filtering of a single wave band, the passband bandwidth is generally in the order of a few nanometers, and the method has high requirements on the incident angle of optical signals. The filter bandwidth of a birefringent crystal filter is inversely proportional to the thickness of the crystal, and increasing the thickness of the crystal greatly reduces its solid angle of acceptance and increases losses in the pass band. A compact design of the fabry-perot interferometer can provide very high luminous flux and spectral resolution. However, the passband of the high-order series is difficult to filter, and the traditional solution is to combine several fabry-perot interferometers for filtering, but this method reduces the peak transmittance of the fabry-perot filter and has a large loss to the optical power.
The defect of the traditional filter device is made up by the appearance of the atomic filter, and the atomic filter is an ideal quantum optical device for detecting weak laser or fluorescent signals in continuous strong background light. It can operate at many discrete wavelengths in the ultraviolet, visible and near infrared spectral ranges. Because the transmission peak wavelength of the atomic filter is always based on the wavelength of an atomic transition spectral line, compared with a common interference filter and a Fabry-Perot etalon, the transmission peak wavelength of the atomic filter is more accurate and reliable.
The basic atomic filter comprises an Atomic Resonance Filter (ARF) and a Faraday anomalous dispersion filter (FADOF), wherein the ARF can realize the filtering of multiple wavelengths in near ultraviolet, visible light and near infrared, has the characteristics of large field angle and ultra-narrow bandwidth, but has the response speed limited by the speed of radiation, and has low transmittance, so that the imaging cannot be performed. The FADOF is a dispersive atomic filter, realizes filtering by utilizing the Faraday rotation in the atomic resonance absorption peak, has the advantages of ARF, high response speed, high transmissivity and imaging, and is a more perfect optical filter with excellent performance.
For the FADOF technique, two special effects, namely the faraday effect and the Voigt effect, occur depending on the direction of the optical axis or perpendicular to the optical propagation axis of the magnetic field. In systems with non-axial and non-perpendicular magnetic field directions, the filtering effect is significantly higher than in systems with only axial or perpendicular axes of light propagation due to the mutual superposition of the two effects. In the prior art, because the direction of a magnetic field is fixed, the axial adjustment capability of the magnetic field is lacked, and the characteristics of a narrow-band filter still need to be optimized.
In addition, in the prior art, the FADOF technology mostly uses a single filter medium for a single wavelength range, which greatly limits the development of the narrow-band filtering technology. By integrating various filter media in one device and controlling various filter parameters, narrow-band filtering of incident light with multiple specific wavelengths can be realized.
Disclosure of Invention
The invention overcomes the defects of the prior art, and solves the technical problems that: a narrow-band filtering apparatus and method based on a filtering medium are provided.
In order to solve the technical problems, the invention adopts the technical scheme that: a narrow-band filtering device based on a filtering medium comprises an optical input device, a filtering adjusting device and an optical output device, wherein after the filtered light is input through the optical input device, the filtered light is output from the output device after being subjected to atomic filtering through the filtering adjusting device;
the filtering adjusting device comprises a U-shaped sliding chute, a filtering medium frame and a main rotating shaft;
the bottom of the U-shaped chute is sleeved on the main rotating shaft and is fixed by a fastening screw; an upper guide rail and a lower guide rail are arranged in the U-shaped sliding groove, an adjusting nut is arranged on the outer side of the U-shaped sliding groove, a gear connected with the adjusting nut is arranged on the inner side of the U-shaped sliding groove, and gear meshing grooves matched with the gear are formed in the upper surface of the lower guide rail and the lower surface of the upper guide rail; the upper guide rail and the lower guide rail are respectively provided with a first magnet bracket and a second magnet bracket, and the first magnet bracket and the second magnet bracket are respectively used for arranging a first magnet and a second magnet;
the filter medium frame is fixedly arranged on the main rotating shaft and used for arranging a filter medium air chamber; and the filter medium frame is provided with a heating sheet, and the heating sheet is used for heating the filter medium air chamber.
The filter medium frame includes runner, draw-in groove seat and carousel fastening screw, the runner rotates through the carousel fastening screw that is located the center and sets up on the draw-in groove seat to it is fixed through the locking jackscrew, the draw-in groove seat sets up through the fixing screw on the main rotation axis, be provided with a plurality of holding tanks that are used for setting up the filter medium air chamber along the circumferencial direction on the runner, correspond the position with the holding tank on the draw-in groove seat and be provided with logical unthreaded hole, the heating plate setting is in between draw-in groove seat and the runner.
The filtering adjusting device further comprises a rotating dial, the rotating dial is fixedly arranged on the main rotating shaft, the filtering medium frame is fixedly arranged on the rotating dial, scales are arranged on the rotating dial, and scale-matched scribed lines are arranged on the U-shaped sliding grooves.
The filtering adjusting device further comprises first piezoelectric ceramics and second piezoelectric ceramics, the first magnet is arranged on the first magnet support through the first piezoelectric ceramics, and the second magnet is arranged on the second magnet support through the second piezoelectric ceramics.
The first magnet and the second magnet are in a top-hat shape, and a through hole for light to pass through is formed in the center of each of the first magnet and the second magnet;
the upper guide rail and the lower guide rail are U-shaped plates, the two sides of the upper guide rail and the lower guide rail are respectively clamped in two sliding grooves above and below the inner wall of the U-shaped sliding groove, and the main rotating shaft is arranged at the center line of the first magnet and the second magnet.
The light input device comprises an input coupling head, a space light input port, a reflector, a non-polarization beam splitting prism, an attenuation sheet with adjustable density and a Risley prism group; the input coupling head is used for accessing light to be filtered input in the form of optical fiber light, the space light input port is used for accessing light to be filtered input in the form of space light, the reflector is used for adjusting the direction of light beams, the non-polarizing beam splitter prism is used for combining the light beams, so that the light paths of the two forms of light to be measured are kept consistent, the attenuator with adjustable density is used for adjusting the incident light intensity, and the prism group is used for calibrating the light paths;
the light output device comprises a plurality of beam splitting prisms and is used for dividing the filtered light into a plurality of beams and outputting the beams to the detection device for detecting the characteristics of the light field, and the detection device comprises one or more of a photoelectric detector, a wavelength meter, a spectrometer and a CCD.
The narrow-band filtering device based on the filtering medium further comprises a servo control system, wherein the servo control system is used for performing feedback adjustment on the heating sheet so as to perform constant temperature control on the filtering medium air chamber;
the filter medium frame is further provided with a Hall element, and the Hall element is used for measuring the magnetic field intensity at the filter medium air chamber.
The invention also provides a narrow-band filtering method based on the filtering medium, which comprises the following steps:
s1, preliminarily obtaining a wavelength range to be filtered, and selecting a corresponding filtering medium;
s2, after the polarization direction is locked, enabling the light to be filtered to pass through a filtering medium gas pool and an analyzer;
s3, selecting working parameters of the filter medium based on the corresponding filter medium to obtain the primarily filtered narrow-band light wave; the working parameters comprise the incident power of the light to be filtered, the spatial magnetic field intensity and direction of the filter medium and the density of the filter medium;
and S4, detecting the obtained narrow-band light wave, further adjusting working parameters of the filter medium according to the detection result, and optimizing the filtering result.
In the step S2, when the light to be filtered passes through the filtering medium gas pool, the light to be filtered is accessed by using the input coupling head or the spatial light input port according to the spatial transmission form of the light to be filtered, and the light beam is ensured to be transmitted and passed by using the lisi prism group.
In the step S1, the selected filter medium is gaseous alkali metal atom vapor, alkaline earth metal atom vapor, associated molecule, or compound molecule.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention provides a narrow-band filtering device based on a filtering medium, aiming at space light and optical fiber light, the narrow-band filtering device can be used for quickly filtering light sources of different space types, and the compatibility of input light sources is improved. Specific atomic molecule media are selected according to a plurality of specific lengths to be filtered, narrow-band filtering of various wavelengths can be achieved, and the filtering wavelength selection range of the atomic filtering device is enlarged.
2. According to the narrow-band filtering method based on the filtering medium, the target wavelength can be rapidly filtered by means of the filter part with adjustable parameters (density of the filtering medium, magnetic field intensity, input light intensity and existence of buffer gas) influencing the filtering effect, compared with the characteristic that the existing atomic filtering device cannot adjust the magnetic field direction, the narrow-band filtering method based on the filtering medium has the capability of quantitatively adjusting the magnetic field direction and carrying out non-axial magnetic field filtering, the filtering bandwidth range of the atomic filtering device is increased, and the obtained filtering effect is superior to that of the device in the prior art.
3. Compared with the prior art, the light input device, the filtering adjusting device and the light output detection device are integrated, and the system integration level is higher.
Drawings
Fig. 1 is a schematic diagram of a filtering principle of a narrow-band filtering apparatus based on a filtering medium according to an embodiment of the present invention;
fig. 2 is an optical path diagram of a narrow-band filtering apparatus based on a filtering medium according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a filter adjusting apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a filter adjusting apparatus according to an embodiment of the present invention;
FIG. 5 is an exploded view of a U-shaped chute according to an embodiment of the present invention;
FIG. 6 is a schematic view of the engagement of the lower and upper rails with the gears in accordance with one embodiment of the present invention;
FIG. 7 is a schematic external view of a magnet and a piezoelectric ceramic used in one embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a filter media holder according to an embodiment of the invention;
fig. 9 is a schematic flowchart of a narrow-band filtering method based on a filtering medium according to a second embodiment of the present invention;
FIG. 10 is a diagram showing the filtering result of Cs atoms according to the second embodiment of the present invention;
FIG. 11 is a diagram showing the result of filtering Rb atoms according to the second embodiment of the present invention;
in the figure: 201 is an input coupling head, 202 is a space light input port, 203 is a reflector, 204 is a non-polarizing beam splitting prism, 205 is an attenuation plate, 206 is a lisley prism group, 207 is a first Glan Taylor prism, 208 is a first magnet, 209 is a filter medium gas chamber, 210 is a second magnet, 211 is a second Glan Taylor prism, 212 is a plurality of beam splitting prisms, and 213 is an output coupling head;
301 is a first piezoelectric ceramic, 302 is a first magnet holder, 303 is a U-shaped chute, 304 is a filter medium holder, 305 is a second magnet holder, 306 is a second piezoelectric ceramic, and 307 is a bottom plate;
401 is a main rotating shaft, 402 is a lower guide rail, 403 is a gear, 404 is a fastening screw, 405 is an adjusting nut, 406 is an upper guide rail, 407 is a rotating dial, and 408 is a gear meshing groove;
501 is a first fixing screw, 502 is a chute clamping groove, 503 is a second fixing screw;
701 is hall element, 702 is holding tank, 703 is set screw, 704 is heating plate, 705 is turntable fastening screw, 706 is locking jackscrew, 707 is card groove seat, 708 is clear hole, 709 is runner.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
As shown in fig. 1 to 5, a narrow-band filtering device based on a filtering medium according to a first embodiment of the present invention includes an optical input device, a filtering adjustment device, and an optical output device, where after the filtered light is input through the optical input device, the filtered light is output from the output device after being subjected to atomic filtering by the filtering adjustment device.
Specifically, as shown in fig. 2, in the present embodiment, an input coupling head 201, a spatial light input port 202, a reflecting mirror 203, a non-polarizing beam splitting prism 204, an attenuation sheet 205 with adjustable density, and a risley prism group 206 are disposed in the input and calibration module. The input coupling head 201 is used for accessing light to be detected input in the form of optical fiber light, the spatial light input port 202 is used for accessing light to be detected input in the form of spatial light, the reflector 203 is used for adjusting the direction of light beams, the non-polarizing beam splitter prism 204 is used for combining the light beams, so that the light paths of the two forms of light to be detected are kept consistent, the attenuation sheet 205 with adjustable density is used for adjusting the incident light intensity, and the lisley prism group 206 is used for calibrating the light paths. In the filtering adjustment device, a first glan-taylor prism 207, two magnets 208 and 210, a filtering medium air chamber 209 and a second glan-taylor prism 211 are arranged, the first glan-taylor prism 207 is used for locking the polarization direction of input light, the two magnets 208 and 210 are used for providing a uniform magnetic field at the position of the filtering medium and enabling light to be measured to pass through, the filtering medium air chamber 209 is used for providing a filtering medium acting on a light source to be filtered, and the second glan-taylor prism 211 is used for filtering a background and extracting a filtering result.
Specifically, as shown in fig. 2 to 8, the filter adjusting device includes a U-shaped chute 303, a filter medium holder 304, and a main rotating shaft 401; the bottom of the U-shaped chute 303 is sleeved on the main rotating shaft 401 and is fixed by a fastening screw 404; an upper guide rail 402 and a lower guide rail 406 are arranged in the U-shaped sliding groove 303, an adjusting nut 405 is arranged on the outer side of the U-shaped sliding groove, a gear 403 connected with the adjusting nut 405 is arranged on the inner side of the U-shaped sliding groove, and gear meshing grooves 408 used for being matched with the gear 403 are formed in the upper surface of the lower guide rail 406 and the lower surface of the upper guide rail 402; the upper guide rail 402 and the lower guide rail 406 are respectively provided with a first magnet support 302 and a second magnet support 305, and the first magnet support 302 and the second magnet support 305 are respectively used for arranging a first magnet 208 and a second magnet 210; the filter medium frame 304 is fixedly arranged on the main rotating shaft 401 and is used for arranging the filter medium air chamber 209; the filter medium shelf 304 is provided with a heating plate 704, and the heating plate 704 is used for heating the filter medium air chamber 209 to change the density of the filter medium.
Specifically, in this embodiment, the heating sheet 209 is a non-magnetic heating sheet, and the non-magnetic heating sheet performs temperature rise control on the working filter medium air chamber during operation, the temperature measuring portion is attached to the filter medium air chamber for temperature measurement, and the servo control system is configured to perform feedback adjustment on the heating portion, so as to improve the temperature control accuracy, where in this embodiment, the upper limit of the heating temperature is 200 ℃, and the temperature control accuracy is 0.1 ℃.
Specifically, as shown in fig. 3, the filtering adjustment device further includes a bottom plate 307, the first glan-taylor prism 207 and the second glan-taylor prism 211 are fixedly disposed at two ends of the bottom plate 307 through an optical frame, the main rotating shaft 401 is fixedly disposed on the bottom plate 307, the U-shaped sliding groove 303 can rotate around the main rotating shaft 401, so that the first magnet 208 and the second magnet 210 rotate, magnetic fields in different directions are provided for the filtering medium air chamber 209 on the filtering medium frame 304, the fastening screw 404 is used for locking an included angle between the magnetic field and the optical field, the adjusting nut 405 is connected with the gear 403 for adjusting the rotating gear 403, and the gear 403 is matched with the upper guide rail 406 and the lower guide rail 402, so that the distance between the first magnet 208 and the second magnet 210 can be further adjusted.
Specifically, as shown in fig. 8, in this embodiment, the filter medium holder 304 includes a rotating wheel 709, a slot seat 707, and a rotating disc fastening screw 705, the rotating wheel 709 is rotatably disposed on the slot seat 707 by the rotating disc fastening screw 705 located at the center and is fixed by a locking jackscrew 706, the slot seat 707 is disposed on the main rotating shaft 401 by a fixing screw 703, a plurality of receiving slots 702 for disposing the filter medium air chamber 209 are disposed on the rotating wheel 709 along the circumferential direction, a light passing hole 708 is disposed on the slot seat 707 at a position corresponding to the receiving slots 702, the light passing hole 708 is used for making the filter medium to be filtered incident on the filter medium and outputting the filter medium from the other side, and a heating plate 704 is disposed between the slot seat 707 and the rotating wheel 709. Each receiving slot 702 is used to set up a filter media plenum 209 for different filter media to meet different wavelength requirements, and the wheel 709 is used to rotate the filter media plenum 209 for filter media selection. The locking jackscrew 706 is used to lock the selected filter media plenum.
Further, as shown in fig. 4, the filtering adjustment device further includes a rotary dial 407, the rotary dial 407 is fixedly disposed on the main rotating shaft 401, the filtering medium holder 304 is fixedly disposed on the rotary dial 407, the rotary dial 407 is provided with scales, and the U-shaped sliding groove 303 is provided with a reticle engaged with the scales. The reticle is matched with the scale arranged on the rotary dial 407, so that the included angle between the light field and the magnetic field can be calibrated. The rotation axis can be locked by tightening the screw 404 when the angle needs to be fixed. The slot seat 707 is fixed to the rotary dial 407 by a fixing screw 703.
Further, as shown in fig. 3, the filter adjusting apparatus further includes a first piezoelectric ceramic 301 and a second piezoelectric ceramic 306, the first magnet 208 is disposed on the first magnet holder 302 through the first piezoelectric ceramic 306, and the second magnet 210 is disposed on the second magnet holder 305 through the second piezoelectric ceramic 306.
Further, as shown in fig. 7, the first magnet 208 and the second magnet 210 have a top hat shape, and a through hole for passing light is formed through the center thereof.
Further, as shown in fig. 5 to 6, the upper guide rail 406 and the lower guide rail 402 are U-shaped plates, two sides of the upper guide rail 406 and the lower guide rail 402 are respectively clamped in two sliding grooves 502 above and below the inner wall of the U-shaped sliding groove 303, and the main rotating shaft 401 is arranged at a center line of the first magnet 208 and the second magnet 210.
Specifically, in the embodiment of the present invention, during operation, the magnetic field strength control module enters a coarse adjustment mode, the lower guide rail 402 is engaged with the gear 403 through the upper gear engagement groove 408, the upper guide rail 406 is engaged with the gear 403 through the lower gear engagement groove 408, and when the gear 403 is rotated by rotating the adjusting screw 405, the upper and lower guide rails move left/right along with the gear engagement groove, so as to drive the top hat-shaped magnet to move left/right, thereby changing the distance between the two magnets, and changing the magnetic field at the air chamber of the filter medium to a larger extent; in the embodiment, the magnetic field can reach 0.7T at most, and the magnetic field value of the position of the filter medium air chamber can be obtained through the Hall element. When the device works, the device enters a fine adjustment mode after working in a coarse adjustment mode for a period of time, and under the working condition of obtaining a primary filtering result, the device finely controls the magnetic field intensity at a filtering medium by controlling the extension/contraction of the piezoelectric ceramics in a small range through the piezoelectric ceramics 301 and 306 and an additional stepping servo control system, so that the filtering result is optimized.
Further, as shown in fig. 2, in the present embodiment, the light output device includes a plurality of beam splitting prisms 212 for splitting the filtered light into a plurality of beams for detection and output respectively. As shown in fig. 1, the light field characteristics may be detected by a photodetector, a wavelength meter, a spectrometer, a CCD, or other detection device.
Further, the narrow-band filtering device based on the filtering medium of the embodiment further includes a servo control system, and the servo control system is used for performing feedback adjustment on the heating sheet 704 to perform constant temperature control on the filtering medium air chamber 209; the filter medium frame 304 is also provided with a Hall element 701, and the Hall element 701 is used for measuring the magnetic field intensity at the position of the filter medium air chamber 209.
Preferably, a gas cell containing other filter media with the same specification as the given filter medium gas cell can be additionally manufactured to meet more filter requirements.
Preferably, a filter medium gas chamber containing an inert buffer gas, a quenching gas or a spin relaxation-inhibiting coating can be manufactured to increase the filter bandwidth and optimize the filter effect.
Example two
As shown in fig. 9, a second embodiment of the present invention provides a narrow-band filtering method based on a filter medium, which is implemented based on the apparatus of the first embodiment, and specifically includes the following steps:
s1, preliminarily obtaining a wavelength range to be filtered, and selecting a corresponding filtering medium;
s2, after the polarization direction is locked, enabling the light to be filtered to pass through a filtering medium gas pool and an analyzer;
s3, selecting working parameters of the filter medium based on the corresponding filter medium to obtain the primarily filtered narrow-band light wave; the working parameters comprise the incident power of the light to be filtered, the spatial magnetic field intensity and direction of the filter medium and the density of the filter medium;
and S4, detecting the obtained narrow-band light wave, further adjusting working parameters of the filter medium according to the detection result, and optimizing the filtering result.
Specifically, in step S2 of this embodiment, when the light to be filtered passes through the filtering medium gas pool, the light to be filtered is accessed by using the input coupling head or the spatial light input port according to the spatial transmission form to be filtered, and the risley prism group is used to ensure that the light beam is transmitted.
Specifically, in step S1, the selected filter medium is a gaseous alkali metal atom, alkaline earth metal atom, associated molecule, or compound molecule.
Specifically, in step S3, when the magnetic field intensity is adjusted, the magnetic field intensity control module enters a coarse adjustment mode first, the rack above the lower guide rail 402 is engaged with the gear 403, the rack below the upper guide rail 406 is engaged with the gear 403, and when the gear 403 is rotated by rotating the adjusting screw 405, the upper and lower guide rails move left/right along with the rack, so as to drive the top-hat-shaped magnet to move left/right, thereby changing the distance between the two magnets, and changing the magnetic field at the filter medium air chamber to a large extent; in the embodiment, the magnetic field can reach 0.7T at most, and the magnetic field value of the position of the filter medium air chamber can be obtained through the Hall element. When the device works, the device enters a fine adjustment mode after working in a coarse adjustment mode for a period of time, and under the working condition of obtaining a primary filtering result, the device finely controls the magnetic field intensity at a filtering medium by controlling the extension/contraction of the piezoelectric ceramics in a small range through the piezoelectric ceramics 301 and 306 and an additional stepping servo control system, so that the filtering result is optimized.
The result of the narrow-band filtering of the laser emitted from an 894nm tunable semiconductor laser (DL pro, toptica corporation) using the present invention is shown in fig. 10. Through calculation, the peak transmittance of the obtained filtering result is 70%, and the full width at half maximum is 0.24GHz. The result of the narrow-band filtering of the laser emitted by a 795nm tunable semiconductor laser (DL pro, toptica corporation) using the present invention is shown in fig. 11. The resulting filter results in a peak transmission of 78% and a full width at half maximum of 0.62GHz. Therefore, the method is proved to be capable of realizing narrow-band filtering of various filtering media, and the filtering effect is obviously higher than that of the prior art. The multiple peaks in the graph indicate that filtering can be achieved at several frequency locations in the graph, but the signal obtained at the highest peak is the best, and the remaining peaks can be eliminated by controlling the threshold, etc.
In summary, the present invention provides a narrow-band filtering method and device based on filtering media, which realizes narrow-band filtering of multiple specific wavelengths by integrating multiple filtering media and a rotatable magnetic field generating device. Aiming at space light and optical fiber light, the invention can be used for quickly filtering light sources in different space types; specific filter media are selected according to a plurality of specific lengths to be filtered, and the target wavelength can be filtered quickly by means of the filter part with adjustable parameters (filter medium density, magnetic field intensity and input light intensity) influencing the filter effect; compared with the characteristic that the existing atomic filtering device cannot adjust the magnetic field direction, the device has the capability of quantitatively adjusting the magnetic field direction and performing non-axial magnetic field filtering, and the obtained filtering effect is superior to that of the device in the prior art; the Hall element is integrated on the filtering medium gas pool part, so that the magnetic field can be rapidly detected; the optical analysis module is integrated, real-time and diversified detection can be carried out on the filtering result, and real-time detection and re-optimization can be carried out on the obtained filtering result. The method has the obvious advantages of wide covering wavelength, good filtering effect, high integration level, real-time detection, easy use and the like.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A narrow-band filtering device based on a filtering medium is characterized by comprising an optical input device, a filtering regulation device and an optical output device, wherein after being input through the optical input device, filtered light is output from the output device after being subjected to atomic filtering through the filtering regulation device;
the filtering adjusting device comprises a U-shaped sliding groove (303), a filtering medium frame (304) and a main rotating shaft (401);
the bottom of the U-shaped sliding groove (303) is sleeved on the main rotating shaft (401) and is fixed through a fastening screw (404); an upper guide rail (406) and a lower guide rail (402) are arranged in the U-shaped sliding groove (303), an adjusting nut (405) is arranged on the outer side of the U-shaped sliding groove, a gear (403) connected with the adjusting nut (405) is arranged on the inner side of the U-shaped sliding groove, and gear meshing grooves (408) used for being matched with the gear (403) are formed in the upper surface of the lower guide rail (402) and the lower surface of the upper guide rail (406); the upper guide rail (406) and the lower guide rail (402) are respectively provided with a first magnet bracket (302) and a second magnet bracket (305), and the first magnet bracket (302) and the second magnet bracket (305) are respectively used for arranging a first magnet (208) and a second magnet (210);
the filter medium frame (304) is fixedly arranged on the main rotating shaft (401) and is used for arranging the filter medium air chamber (209); the filter medium frame (304) is provided with a heating sheet (704), and the heating sheet (704) is used for heating the filter medium air chamber (209).
2. The narrow-band filter device based on the filter medium as claimed in claim 1, wherein the filter medium holder (304) comprises a rotating wheel (709), a slot seat (707) and a rotating disc fastening screw (705), the rotating wheel (709) is rotatably arranged on the slot seat (707) through the rotating disc fastening screw (705) located at the center and is fixed through a locking jackscrew (706), the slot seat (707) is arranged on the main rotating shaft (401) through the fixing screw (703), the rotating wheel (709) is provided with a plurality of accommodating grooves (702) for arranging the filter medium air chamber (209) along the circumferential direction, the slot seat (707) is provided with a light through hole (708) corresponding to the accommodating grooves (702), and the heating plate (704) is arranged between the slot seat (707) and the rotating wheel (709).
3. A narrow-band filter device based on filter media according to claim 1, wherein the filter adjusting device further comprises a rotary dial (407), the rotary dial (407) is fixedly arranged on the main rotating shaft (401), the filter media frame (304) is fixedly arranged on the rotary dial (407), the rotary dial (407) is provided with scales, and the U-shaped chute (303) is provided with graduations matched with the scales.
4. A filter medium-based narrow-band filter device according to claim 1, wherein the filter adjusting means further comprises a first piezoelectric ceramic (301) and a second piezoelectric ceramic (306), the first magnet (208) being arranged on the first magnet holder (302) via the first piezoelectric ceramic (301), and the second magnet (210) being arranged on the second magnet holder (305) via the second piezoelectric ceramic (306).
5. The narrow-band filtering device based on filtering medium as claimed in claim 4, wherein said first magnet (208) and said second magnet (210) are in the shape of top-hat with a through hole in its center for passing light;
the upper guide rail (406) and the lower guide rail (402) are U-shaped plates, two sides of the upper guide rail (406) and two sides of the lower guide rail (402) are respectively clamped in two sliding grooves (502) above and below the inner wall of the U-shaped sliding groove (303), and the main rotating shaft (401) is arranged at the center line of the first magnet (208) and the second magnet (210).
6. A narrow-band filtering device based on a filtering medium according to claim 1,
the light input device comprises an input coupling head (201), a space light input port (202), a reflecting mirror (203), a non-polarization beam splitting prism (204), an attenuation sheet (205) with adjustable density and a prism group (206); the system comprises an input coupling head (201) used for accessing light to be filtered input in the form of optical fiber light, a spatial light input port (202) used for accessing light to be filtered input in the form of spatial light, a reflecting mirror (203) used for adjusting the direction of light beams, a non-polarizing beam splitting prism (204) used for combining the light beams, so that the light paths of the two forms of light to be filtered are kept consistent, an attenuation sheet (205) with adjustable density is used for adjusting the incident light intensity, and a Risley prism group (206) used for calibrating the light paths;
the light output device comprises a plurality of beam splitting prisms (212) for splitting the filtered light into a plurality of beams and outputting the beams to the detection device for detecting the light field characteristics, and the detection device comprises one or more of a photoelectric detector, a wavelength meter, a spectrometer and a CCD.
7. The narrow-band filter device based on filter media of claim 1, further comprising a servo control system for feedback adjustment of the heating plate (704) for thermostatic control of the filter media gas chamber (209);
the filter medium frame (304) is further provided with a Hall element (701), and the Hall element (701) is used for measuring the magnetic field intensity at the position of the filter medium gas chamber (209).
8. A method of narrow-band filtering based on a filter medium, comprising the steps of:
s1, preliminarily obtaining a wavelength range to be filtered, and selecting a corresponding filtering medium;
s2, after the polarization direction is locked, enabling the light to be filtered to pass through a filtering medium gas pool and a polarization detection device;
s3, selecting working parameters of the filter medium based on the corresponding filter medium to obtain narrow-band light waves after primary filtering; the working parameters comprise the incident power of the light to be filtered, the spatial magnetic field intensity and direction of the filter medium and the density of the filter medium;
and S4, detecting the obtained narrow-band light wave, further adjusting working parameters of the filter medium according to the detection result, and optimizing the filtering result.
9. The narrow-band filtering method based on filtering medium of claim 8, wherein in step S2, when the light to be filtered passes through the filtering medium gas pool, the light to be filtered is accessed by using the input coupling head or the spatial light input port according to the spatial transmission form to be filtered, and the light beam is ensured to pass through by using the lisley prism set.
10. The method for filtering narrow-band based on filter medium according to claim 8, wherein in step S1, the selected filter medium is vapor of gaseous alkali metal atom, vapor of gaseous alkaline earth metal atom, associated molecule or compound molecule.
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|---|---|---|---|---|
| EP0352844A2 (en) * | 1988-07-23 | 1990-01-31 | Philips Patentverwaltung GmbH | Optical isolator, circulator, switch or similar device with a Faraday rotator |
| CN106681013A (en) * | 2017-03-29 | 2017-05-17 | 山西大学 | Method and equipment for constructing filtering-frequency reflecting mirror |
| CN209297585U (en) * | 2018-09-26 | 2019-08-23 | 天津商业大学 | A kind of Hall, faraday and Zeemen effect comprehensive test instrument |
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| CN102809032B (en) * | 2012-08-20 | 2014-05-14 | 重庆金母带科技有限公司 | Electric rotating slideway for movable camera shooting |
| CN103825184B (en) * | 2014-03-07 | 2016-12-07 | 北京大学 | A kind of ultra-narrow band excited state faraday anomalous dispersion atomic light filter of communication band |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0352844A2 (en) * | 1988-07-23 | 1990-01-31 | Philips Patentverwaltung GmbH | Optical isolator, circulator, switch or similar device with a Faraday rotator |
| DE3825079A1 (en) * | 1988-07-23 | 1990-02-01 | Philips Patentverwaltung | OPTICAL ISOLATOR, CIRCULATOR, SWITCH OR THE LIKE WITH A FARADAY ROTATOR |
| CN106681013A (en) * | 2017-03-29 | 2017-05-17 | 山西大学 | Method and equipment for constructing filtering-frequency reflecting mirror |
| CN209297585U (en) * | 2018-09-26 | 2019-08-23 | 天津商业大学 | A kind of Hall, faraday and Zeemen effect comprehensive test instrument |
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