CN111623866B - Device and method for measuring vibration mode of nano optical fiber - Google Patents
Device and method for measuring vibration mode of nano optical fiber Download PDFInfo
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- CN111623866B CN111623866B CN202010328273.4A CN202010328273A CN111623866B CN 111623866 B CN111623866 B CN 111623866B CN 202010328273 A CN202010328273 A CN 202010328273A CN 111623866 B CN111623866 B CN 111623866B
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- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
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Abstract
The invention discloses a device and a method for measuring a vibration mode of a nano optical fiber, wherein a light splitting system is arranged in the emergent direction of a laser, the light is split into two beams, namely a first light beam and a second light beam, and a first 45-degree total reflector, a light frequency shift system, a second 45-degree total reflector and a non-polarization beam splitter are arranged in the emergent direction of the first light beam; and a nano optical fiber system to be detected and an unpolarized beam splitter are arranged in the emergent direction of the second light beam, two light beams are split and superposed on the unpolarized beam splitter and then are divided into a third light beam and a fourth light beam, the third light beam is transmitted to a common detector and converted into an electric signal to be transmitted to an oscilloscope, the fourth light beam is transmitted to a single photon detector, and the single photon detector converts an input optical signal into an electric pulse signal, enters a data acquisition card and stores the electric pulse signal. The device and the method can finally realize the real-time measurement of the mechanical frequency of the nano optical fiber, and the measurement method is simple and easy to repeat, and can measure the picowatt-level weak signal.
Description
Technical Field
The invention relates to the technical field of nano optical fiber mechanical vibration frequency, in particular to a device and a method for measuring a nano optical fiber vibration mode.
Background
Due to the rapid development of communication technology, fiber optic waveguides have become an important modern technology. The optical fiber sensing.
The nanometer fiber is made by heating, melting and stretching a common single-mode fiber, and the diameter of the finest lumbar vertebra of the nanometer fiber is in the sub-wavelength level. The nano optical fiber has strong constraint on a transverse transmission mode of light, so that a strong evanescent field is provided, and necessary conditions are provided for interaction of light and atoms. Research has shown that the radiation of atoms located within the evanescent field of the fiber surface can be effectively enhanced. Meanwhile, the nano optical fiber can efficiently collect surface atomic radiation fluorescence, the collection efficiency can reach more than 20% theoretically, the collection efficiency is greatly improved compared with that of a traditional objective lens with a high numerical aperture by 4% -5%, and the nano optical fiber is widely applied to the fields of micro-nano photonics, quantum precision measurement, nonlinear optics and the like due to the advantages of the nano optical fiber in the aspect of fluorescence collection.
The evanescent field generated by the nano optical fiber is distributed in a half wavelength area on the surface of the optical fiber, and has the characteristics of small mode volume, high optical power density and the like. Because the core diameter of the nano optical fiber is in the sub-wavelength order, only the fundamental mode can be stably transmitted, and therefore a dipole well can be established on the surface of the nano optical fiber by using an evanescent field and used for trapping an atomic array. The dipole trapping of cold atoms based on the nano optical fiber obviously improves the effective atomic number of interaction in the evanescent field and the service life of the cold atoms in the evanescent field, and enhances the interaction strength between the effective atomic number and the cold atoms.
Meanwhile, the nano optical fiber in the high vacuum environment is subjected to small environmental resistance, and can generate certain inherent mechanical vibration frequencies including a violin vibration frequency, a torsion frequency and a breathing frequency, which are close to the vibration frequency of atoms trapped in the established dipole trap, so that resonance is generated, and the atoms trapped in the trap have certain probability to escape from the trap. In addition, when the nano optical fiber is used for sensing application, the mechanical vibration of the nano optical fiber can affect high-frequency sensing, so that in the sensing application process, it is important to avoid the vibration frequency of the nano optical fiber or feedback control the vibration of the optical fiber. Therefore, the measurement of the mechanical vibration frequency of the nano-fiber is an urgent problem to be solved.
Disclosure of Invention
In order to solve the defects and shortcomings of the prior art, the device and the method for measuring the vibration mode of the nano optical fiber are provided, the vibration frequency of the nano optical fiber is avoided or the vibration of the optical fiber is controlled in a feedback mode, and the mechanical vibration frequency of the nano optical fiber is measured by utilizing heterodyne detection.
The device and the method for measuring the vibration mode of the nano optical fiber comprise a laser, a light splitting system, a nano optical fiber system to be measured and a non-polarization beam splitter, wherein the nano optical fiber system to be measured consists of a vacuum cavity and a nano optical fiber placed in the vacuum cavity, laser emitted by the laser enters the light splitting system and is split into a first light beam and a second light beam, and the first light beam is transmitted to the non-polarization beam splitter through a first 45-degree total reflector, a light frequency shift system and a second 45-degree total reflector; the second light beam is input into a nano optical fiber system to be detected, enters the inside of the nano optical fiber, the light intensity is set to be in a microwatt magnitude, forms a third light beam after being overlapped and interfered with the transmitted first light beam on the non-polarization beam splitter, transmits the third light beam to a common detector, converts the third light beam into an electric signal and transmits the electric signal to an oscilloscope, the oscilloscope obtains a signal for optimizing interference contrast, when the interference contrast of the two light beams is adjusted to be maximum, the second light beam irradiates the waist of the nano optical fiber, the light intensity is set to be in a single photon magnitude, forms a fourth light beam after being overlapped and interfered with the transmitted first light beam on the non-polarization beam splitter, transmits the fourth light beam to the single photon detector, the single photon detector converts the input light signal into an electric pulse signal and enters a data acquisition.
As a further improvement of the above scheme, the optical splitting system includes a locking optical path and a splitting optical path of the laser, and the locking optical path and the splitting optical path are respectively used for the nano optical fiber system to be measured and the optical frequency shift system.
As a further improvement of the above solution, the optical frequency shifting system comprises two double-pass acousto-optic modulators, such that the optical frequencies of the first and second beams are shifted by 22.5 MHz.
As a further improvement of the scheme, the nano optical fiber is made by melting and tapering a common single mode optical fiber, the diameter of the narrowest waist of the optical fiber is 400-600nm, and the nano optical fiber comprises three parts, namely a single mode optical fiber part, a tapered area and a waist.
As a further improvement of the scheme, the vacuum cavity is provided with two large window sheets and six small window sheets, the large window sheets are respectively sealed at the upper part and the lower part of the vacuum cavity, the six small window sheets respectively surround a circle at the side surface of the vacuum cavity, the waist part of the nano optical fiber is positioned at the central position of the vacuum cavity, and the single mode optical fiber parts at two ends penetrate through the vacuum cavity through a fed through structure.
As a further improvement of the scheme, the laser is an external cavity feedback type semiconductor laser, the wavelength of the laser is 852nm, and the maximum optical power is 100 mW.
As a further improvement of the scheme, the 45-degree total reflection mirror is a high reflection mirror with the reflectivity of 99.9%, and the action wave band is 750nm-1050 nm.
As a further improvement of the scheme, the beam splitting ratio of the non-polarization beam splitter is 9:1, and the action wave band is 700-1100 nm.
As a further improvement of the above-described solution,
the method comprises the following steps:
s1, starting a laser, and dividing the laser into a first light beam and a second light beam through a light splitting system;
s2, enabling a first light beam to pass through a first 45-degree total reflector, a light frequency shift system, a second 45-degree total reflector and enter a non-polarization beam splitter, enabling a second light beam to be input into the nano optical fiber, setting light intensity to be in a microwatt magnitude, enabling the two light beams to be split and overlapped on the 9:1 non-polarization beam splitter to interfere, outputting a third light beam to be detected by a common detector, inputting an electric signal into an oscilloscope, adjusting directivity, light spot size, shape and polarization of the two light beams according to interference fringe contrast displayed on the oscilloscope, enabling interference contrast of the two light beams to be maximum, and finally enabling the contrast to be more than 95%;
s3, when the interference contrast of the two beams of light is adjusted to be maximum, the second light beam is incident to the waist of the nano optical fiber through a window of a vacuum cavity of the nano optical fiber system to be detected, part of the second light beam is optically coupled into the nano optical fiber, the light intensity is set to be single photon magnitude and is emitted to the non-polarization beam splitter through the other end of the nano optical fiber, the light intensity and the transmitted first light beam form a fourth light beam after being overlapped and interfered on the non-polarization beam splitter, and the fourth light beam is transmitted to the single photon detector;
s4, converting the input optical signal into an electric pulse signal by the single-photon detector, and entering a data acquisition card;
and S5, reading data stored by the data acquisition card, carrying out Fourier analysis on the acquired signal data, and obtaining a series of nano optical fiber vibration frequencies at the beat frequency.
The invention has the beneficial effects that:
compared with the prior art, the device and the method for measuring the vibration mode of the nano optical fiber provided by the invention have the advantages that the light splitting system is arranged in the emergent direction of the laser to split light into two beams, namely the first light beam and the second light beam, and the emergent direction of the first light beam is provided with the first 45-degree total reflector, the light frequency shift system, the second 45-degree total reflector and the non-polarization beam splitter; and a nano optical fiber system to be detected and an unpolarized beam splitter are arranged in the emergent direction of the second light beam, two light beams are split and superposed on the unpolarized beam splitter and then are divided into a third light beam and a fourth light beam, the third light beam is transmitted to a common detector and converted into an electric signal to be transmitted to an oscilloscope, the fourth light beam is transmitted to a single photon detector, and the single photon detector converts an input optical signal into an electric pulse signal, enters a data acquisition card and stores the electric pulse signal. The device and the method can improve the signal-to-noise ratio of the vibration frequency of the measured nano optical fiber, detect the violin vibration frequency, the torsion frequency and the respiratory frequency of the vibration of the nano optical fiber, and can be widely applied to the field of low-frequency signal measurement. The device and the method can finally realize the real-time measurement of the mechanical frequency of the nano optical fiber, and the measurement method is simple and easy to repeat, and can measure the picowatt-level weak signal.
Drawings
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings, in which:
FIG. 1 is a schematic diagram of the structure of the apparatus of the present invention;
FIG. 2 is a schematic diagram of interference fringes collected on an oscilloscope with software fitting to obtain the interference contrast of a first light beam and a second light beam;
FIG. 3 is a schematic diagram of the measured mechanical frequency of the nanofiber through Fourier transform of data recorded by the single photon detector and the data acquisition card.
Detailed Description
As shown in fig. 1-3, the apparatus and method for measuring a vibration mode of a nanofiber provided by the present invention includes a laser 1, a light splitting system 2, a nanofiber system to be measured 8, and a non-polarizing beam splitter 9, where the nanofiber system to be measured 8 is composed of a vacuum chamber and a nanofiber placed in the vacuum chamber, laser emitted from the laser 1 enters the light splitting system 2 and is divided into a first light beam 3 and a second light beam 4, and the first light beam 3 passes through a first 45-degree total reflector 5, a light frequency shifting system 6, and a second 45-degree total reflector 7 and is transmitted to the non-polarizing beam splitter 9; the second light beam 4 is input into a nano optical fiber system 8 to be detected, enters the inside of the nano optical fiber, is set with a light intensity microwatt magnitude, forms a third light beam 10 after being overlapped and interfered with the transmitted first light beam 3 on the non-polarization beam splitter 9, is transmitted to a common detector 14, is converted into an electric signal and is transmitted to an oscilloscope 15, the oscilloscope 15 obtains a signal for optimizing interference contrast, when the interference contrast of the two light beams is adjusted to be maximum, the waist of the nano optical fiber is irradiated through the second light beam 4, is set with a light intensity single photon magnitude, forms a fourth light beam 11 after being overlapped and interfered with the transmitted first light beam 3 on the non-polarization beam splitter 9, is transmitted to a single photon detector 12, the single photon detector 12 converts the input light signal into an electric pulse signal and enters a data acquisition card 13, and performs Fourier analysis on the acquired data to obtain the vibration frequency.
The common detector 14 in the invention is a (Thorlabs) PDA10A-EC, the detection wavelength range is 200 and 1100nm, and the detection bandwidth is 150 MHz.
The single photon detector 12 is in a model of SPCM-NIR-14-FC, dark count is less than 100c/s, average output pulse width is 7ns, dead time is 20ns, and detection center wavelength is 800 nm.
The resolution of the data acquisition card 13 is 1ns, and the counting rate of each input can reach 1GHz at most.
As a further improvement of the above scheme, the optical splitting system 2 includes a locking optical path and a splitting optical path of the laser 1, and the locking optical path and the splitting optical path are respectively used for the nanofiber system 8 to be measured and the optical frequency shift system 6.
As a further improvement of the above solution, the optical frequency shift system 6 comprises two double-pass acousto-optic modulators, such that the optical frequency shift between the first beam 3 and the second beam 4 is 22.5 MHz. The first two-pass acousto-optic modulator was set to a positive detuning of 87MHz and the second two-pass acousto-optic modulator was set to a negative detuning of 75.75 MHz. Locking the laser 1 to the cesium atom D2Line | F ═ 4>→|F′＝4,5>On the cross-line, a double pass acousto-optic modulator (not shown in the optical path) is used to cause the laser to emitAfter the optical frequency shift is 51.5MHz negative detuning relative to the cross line, the output light passes through another double-pass acousto-optic modulator (not shown in the optical path) to shift 164.5MHz positive frequency, and the output optical frequency is cesium atom D2Line | F ═ 4>→|F′＝5>Negative detuning is 12.5MHz, the light path is divided into a first light beam 3 and a second light beam 4 by a non-polarization beam splitter 9, and the emergent light frequency of the first light beam 3 and the second light beam 4 is cesium atom D2Line | F ═ 4>→|F′＝5>Negative detuning 12.5 MHz. The frequency of the first light beam 3 loaded on the first acousto-optic modulator through the radio frequency source is positive 87MHz, the frequency shift is positive 174MHz after the first light beam passes through the acousto-optic modulator twice, the frequency shift of the emergent light passes through the second acousto-optic modulator again, the frequency shift of the radio frequency source is negative 75.75MHz, the frequency shift of the emergent light passes through the acousto-optic modulator twice is negative 151.5MHz, finally, the frequency shift of the first light beam 3 relative to the second light beam 4 is 22.5MHz, and the frequency shift of the first light beam 3 relative to the cesium atom D is negative 151.5MHz2Line | F ═ 4>→|F′＝5>Frequency shift to positive 10MHz
As a further improvement of the scheme, the nano-fiber is made by melting and tapering a common single-mode fiber, the diameter of the narrowest waist of the fiber is 400-600nm, the nano-fiber comprises three parts, namely a single-mode fiber part, a tapered zone and a waist, wherein the length of the waist is about 1 mm.
As a further improvement of the scheme, the vacuum cavity is provided with two large window sheets and six small window sheets, the large window sheets are respectively sealed at the upper part and the lower part of the vacuum cavity, the six small window sheets respectively surround a circle at the side surface of the vacuum cavity, the waist part of the nano optical fiber is positioned at the central position of the vacuum cavity, the single mode optical fiber parts at two ends penetrate through the vacuum cavity through a fed through structure (vacuum penetrating sealing piece), the vacuum degree is about 10-7pa, of the order of magnitude.
As a further improvement of the above scheme, the laser 1 is an external cavity feedback type semiconductor laser 1, the wavelength of the laser 1 is 852nm, and the maximum optical power is 100 mW.
As a further improvement of the scheme, the 45-degree total reflection mirror is a high reflection mirror with the reflectivity of 99.9%, and the action wave band is 750nm-1050 nm.
As a further improvement of the scheme, the beam splitting ratio of the non-polarization beam splitter 9 is 9:1, and the action wave band is 700-1100 nm.
As a further improvement of the above-described solution,
the method comprises the following steps:
s1, starting a laser 1, adopting a saturated absorption spectrum technology, dividing light emitted by the laser 1 into two paths, wherein light with a mu W magnitude is used for locking the laser 1 on a cesium atom D2Line | F ═ 4>→|F′＝4,5>The other path of light is divided into a first light beam 3 and a second light beam 4 by a light dividing system 2;
wherein, the light of the mu W order is divided into two paths of probe light and pump light, and the light intensity of the pump light is about 10 times of that of the probe light. The two beams travel in opposite directions and overlap through the cesium bulb, giving the laser 1 an external modulation of 250kHz, and detecting the probe light signal with a conventional detector 14 to produce a frequency discrimination curve. The cavity length of the laser 1 is changed by using the piezoelectric ceramic actuator PZT of the PID tuned laser 1, thereby tuning the output laser frequency. Meanwhile, PID adjusts the current of the laser 1 to adjust the laser output frequency, the radio frequency signal generator and the high voltage amplifier are used for scanning the frequency of the laser 1, and the spectral line and the frequency discrimination curve of the saturated absorption spectrum can be read from the oscilloscope 15. Adjusting the gain and bias of the sweep frequency to make the spectral line at | F ═ 4>→|F′＝4,5>Is spread out so that the laser 1 is locked to the crossing line. The output light passes through a positive frequency shift acousto-optic modulator 164.5MHz and a negative frequency shift acousto-optic modulator 51.5MHz, and the frequency of the output laser is shifted to cesium atom D2Line | F ═ 4>→|F′＝5>The transition line is negatively detuned by 12.5 MHz.
S2, a first light beam 3 passes through a first 45-degree total reflector 5, a light frequency shift system 6 and a second 45-degree total reflector 7 and enters a non-polarization beam splitter 9, a second light beam 4 is input into a nano optical fiber, the light intensity is set to be in a microwatt magnitude, two light beams are split and overlapped on the 9:1 non-polarization beam splitter 9 to interfere, a third light beam 10 is output and detected by a common detector 14, then an electric signal is input into an oscilloscope 15, the directivity, the size, the shape and the polarization of the two light beams are adjusted according to the interference fringe contrast displayed on the oscilloscope 15, so that the interference contrast of the two light beams reaches the maximum, and as shown in the graph 3, the contrast finally reaches more than 95%; the calculation formula of the interference contrast is eta ═ A/y0Wherein A isAmplitude of interference fringe, y0Is the bias of the fitted interference fringes relative to zero. The size of the light spot can be adjusted through changing the lens, so that the light spot is enlarged or reduced; two beams of light are split from the same beam of light, so that the shape of a light spot is not changed greatly, and some devices in a light path, such as an acousto-optic modulator and an optical fiber coupling collimator, can be adjusted to ensure that the shape of the light spot is not changed too much; the spatial directivity of the two beams of light needs to be adjusted to be completely overlapped, and the polarization of the two beams of light is adjusted through a polarization controller and a glass slide, so that the interference contrast is maximized.
S3, when the interference contrast of the two beams of light is adjusted to be maximum, the second light beam 4 is incident to the waist of the nano optical fiber through a window of a vacuum cavity of the nano optical fiber system 8 to be detected, the light intensity is set to be single photon magnitude, part of light of the second light beam 4 is coupled into the nano optical fiber from an evanescent field of the nano optical fiber and is emitted to the non-polarization beam splitter 9 through the other end of the nano optical fiber, and the second light beam and the transmitted first light beam 3 form a fourth light beam 11 after being overlapped and interfered on the non-polarization beam splitter 9 and are transmitted to the single photon detector 12;
s4, converting the input optical signal into an electric pulse signal by the single-photon detector 12, enabling the electric pulse signal to enter the data acquisition card 13, enabling the time resolution of the data acquisition card 13 to be 1ns, and respectively storing and recording data accumulated and measured for 20 times according to a time sequence;
s5, extracting the data stored by the data acquisition card 13, importing the acquired data through Matlab, performing Fourier analysis on the data, converting a time domain signal into a frequency domain signal, finally presenting frequency spectrum distribution on a frequency domain, and obtaining information carrying the vibration frequency of the nano optical fiber at the beat frequency, as shown in FIG. 3. At the center frequency, a series of spectral peaks can be observed. And obtaining a vibration frequency result of the nano optical fiber according to simulation, and comparing the vibration frequency result with the measured result to determine the violin vibration frequency, the respiratory vibration frequency and the torsional vibration frequency of the vibration of the nano optical fiber.
The above embodiments are not limited to the technical solutions of the embodiments themselves, and the embodiments may be combined with each other into a new embodiment. The above embodiments are only for illustrating the technical solutions of the present invention and are not limited thereto, and any modification or equivalent replacement without departing from the spirit and scope of the present invention should be covered within the technical solutions of the present invention.
Claims (9)
1. A device for measuring vibration mode of nano optical fiber is characterized in that: the laser device comprises a laser device, a light splitting system, a nano optical fiber system to be detected and a non-polarization beam splitter, wherein the nano optical fiber system to be detected consists of a vacuum cavity and a nano optical fiber placed in the vacuum cavity, laser emitted by the laser device enters the light splitting system and is divided into a first light beam and a second light beam, and the first light beam is transmitted to the non-polarization beam splitter through a first 45-degree total reflection mirror, a light frequency shift system and a second 45-degree total reflection mirror; the second light beam is input into a nano optical fiber system to be detected, enters the inside of a nano optical fiber, is set to have a light intensity of a microwatt magnitude, forms a third light beam after being overlapped and interfered with the transmitted first light beam on a non-polarization beam splitter, is transmitted to a common detector, is converted into an electric signal and is input into an oscilloscope, the oscilloscope obtains a signal for optimizing interference contrast, when the interference contrast of the two light beams is adjusted to be maximum, the second light beam irradiates the waist of the nano optical fiber, the light intensity is set to have a single photon magnitude, forms a fourth light beam after being overlapped and interfered with the transmitted first light beam on the non-polarization beam splitter, is transmitted to a single photon detector, the detector converts the input light signal into an electric pulse signal, enters a data acquisition card, and performs Fourier analysis on the acquired data to obtain the.
2. The apparatus for measuring vibration mode of nano-fiber according to claim 1, wherein: the optical splitting system comprises a locking optical path and an optical splitting optical path of the laser, and the locking optical path and the optical splitting optical path are respectively used for the nano optical fiber system to be detected and the optical frequency shift system.
3. The apparatus for measuring vibration mode of nano-fiber according to claim 2, wherein: the optical frequency shifting system includes two double-pass acousto-optic modulators such that the optical frequencies of the first and second beams are shifted by 22.5 MHz.
4. The apparatus for measuring vibration mode of nano-fiber according to claim 3, wherein: the nano optical fiber is made by melting and tapering common single-mode optical fiber, the diameter of the narrowest waist of the optical fiber is 400-600nm, and the nano optical fiber comprises three parts, namely a single-mode optical fiber part, a tapered area and a waist.
5. The apparatus for measuring vibration mode of nano-fiber according to claim 4, wherein: the vacuum cavity is provided with two large window sheets and six small window sheets, the large window sheets are respectively sealed at the upper part and the lower part of the vacuum cavity, the six small window sheets respectively surround a circle at the side surface of the vacuum cavity, the waist part of the nano optical fiber is positioned at the central position of the vacuum cavity, and the single mode optical fiber parts at the two ends penetrate through the vacuum cavity through the fed through structure.
6. The apparatus for measuring vibration mode of nano-fiber according to claim 5, wherein: the laser is an external cavity feedback semiconductor laser, the wavelength of the laser is 852nm, and the maximum optical power is 100 mW.
7. The apparatus for measuring vibration mode of nano-fiber according to claim 6, wherein: the first 45-degree total reflector and the second 45-degree total reflector are high reflectors with the reflectivity of 99.9%, and the acting wave band is 750nm-1050 nm.
8. The apparatus for measuring vibration mode of nano-fiber according to claim 7, wherein: the beam splitting ratio of the non-polarization beam splitter is 9:1, and the action wave band is 700-1100 nm.
9. A method for measuring vibration mode of nano optical fiber, which is performed by an apparatus for measuring vibration mode of nano optical fiber according to any one of claims 1 to 8, comprising the steps of:
s1, starting a laser, and dividing the laser into a first light beam and a second light beam through a light splitting system;
s2, enabling a first light beam to pass through a first 45-degree total reflector, a light frequency shift system, a second 45-degree total reflector and enter a non-polarization beam splitter, inputting a second light beam into the nano optical fiber, setting the light intensity to be light with a microwatt magnitude, splitting, superposing and interfering two light beams on the 9:1 non-polarization beam splitter, outputting a third light beam, detecting the third light beam by a common detector, inputting an electric signal into an oscilloscope, and adjusting the directivity, the size, the shape and the polarization of a light spot of the two light beams according to the contrast of interference fringes displayed on the oscilloscope, so that the interference contrast of the two light beams reaches the maximum, and finally the contrast reaches more than 95%;
s3, when the interference contrast of the two beams of light is adjusted to be maximum, the second light beam is incident to the waist of the nano optical fiber through a window of a vacuum cavity of the nano optical fiber system to be detected, the light intensity is set to be single photon magnitude, part of the second light beam is optically coupled into the nano optical fiber and is emitted to the non-polarization beam splitter through the other end of the nano optical fiber, and the second light beam and the transmitted first light beam form a fourth light beam after being overlapped and interfered on the non-polarization beam splitter and are transmitted to the single photon detector;
s4, converting the input optical signal into an electric pulse signal by the single-photon detector, and entering a data acquisition card;
and S5, reading data stored by the data acquisition card, carrying out Fourier analysis on the acquired signal data, and obtaining a series of nano optical fiber vibration frequencies at the beat frequency.
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