CN114609558A - All-fiber NV color center sensing magnetic measurement system and method with stable and modulatable power - Google Patents
All-fiber NV color center sensing magnetic measurement system and method with stable and modulatable power Download PDFInfo
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- CN114609558A CN114609558A CN202210511556.1A CN202210511556A CN114609558A CN 114609558 A CN114609558 A CN 114609558A CN 202210511556 A CN202210511556 A CN 202210511556A CN 114609558 A CN114609558 A CN 114609558A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/032—Measuring direction or magnitude of magnetic fields or magnetic flux using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/6402—Atomic fluorescence; Laser induced fluorescence
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1123—Q-switching
- H01S3/117—Q-switching using intracavity acousto-optic devices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1305—Feedback control systems
Abstract
The invention relates to an all-fiber NV color center sensing magnetic measurement system and method with stable and modulatable power, which realize the stability of laser power and the pulse modulation of different time sequences of excitation laser by controlling an acousto-optic modulator. The system consists of an optical fiber laser, an optical fiber acousto-optic modulator, a polarization beam splitter, a photoelectric detector, a feedback adjusting system and the like, wherein first-order diffracted light emitted by the acousto-optic modulator is split into one beam, and the beam, a low-pass filter circuit, a proportional-integral-differential controller and the like form a closed feedback system to adjust the laser power in real time, so that the problem of power fluctuation of excited laser in the system is solved, and the measuring sensitivity of the system is improved. The system adopts the same acousto-optic modulator to simultaneously realize the functions of laser power stabilization and pulse optical switch, avoids introducing a complex optical path in the main optical path of the fluorescence excitation and detection system of the NV color center of the diamond, adopts an all-fiber optical structure in the optical system, has stability and adjustability, and is favorable for realizing integration and miniaturization of the device.
Description
Technical Field
The invention relates to the technical field of laser power stabilization, in particular to an all-fiber NV color center sensing magnetic measurement system and method with stable and modulatable power.
Background
The research of sensing measurement including magnetic field and inertia measurement based on diamond NV color center ensemble is one of the development directions of the miniaturized quantum sensing measurement at present. The solid laser is used as a light source of a laser excitation and fluorescence detection system in a diamond NV color center ensemble sensing measurement research device, the frequency and the power of the solid laser are easily affected by temperature, mechanical factors and the like to generate fluctuation, and the stability of the laser power needs to be improved. The experiment of sensing measurement by using the diamond NV color center ensemble needs to be established on the basis of pulse polarization, control and detection of the electron spin ensemble, so that the experiment of sensing measurement needs to perform high-frequency pulse modulation on excitation laser. In the pulse type control experiment, the pulse generating device is also an important determining factor for determining the polarization of the NV color center and the control quality.
The acousto-optic modulator has the characteristics of high extinction ratio, low optical transmission loss, small size and the like, is basically free from external environment interference, and has very fast response speed, the response time is in nanosecond level, the driver matched with the acousto-optic modulator can modulate the acousto-optic crystal of the modulator according to an input signal, and the acousto-optic modulator has the advantages of strong regulation flexibility, good real-time performance, high stability and the like through a feedback control system, so that the stability and the pulse modulation of laser power can be realized by using the acousto-optic modulator.
As for how to simultaneously realize the stabilization and modulation of laser power in an acousto-optic modulator driving and controlling system, a common method is to use two acousto-optic modulators, first use one acousto-optic modulator to realize the stabilization of laser power, and then use the other acousto-optic modulator to realize the modulation of laser power. Because two acousto-optic modulators are utilized, the complexity of the whole optical path and circuit is increased, and the miniaturization is not facilitated; and the stability requirement for the second acousto-optic modulator driver is very high, which is not favorable for implementation. Therefore, a method for simultaneously realizing laser power stabilization and pulse modulation by using the same acousto-optic modulator is needed to meet the requirements of small system size and low power consumption.
Disclosure of Invention
The invention aims to provide an all-fiber NV color center sensing magnetic measurement system and method with stable and modulatable power so as to overcome the defects in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention discloses an all-fiber type NV color center sensing magnetic measurement system with stable power and adjustable modulation, which comprises a fiber laser, a light power stabilizing and pulse modulating unit, a diamond NV color center laser excitation and fluorescence detection unit and an optical fiber;
The optical fiber laser, the optical power stabilizing and pulse modulating unit and the diamond NV color center laser excitation and fluorescence detection unit are connected through optical fibers;
the diamond NV color center laser excitation and fluorescence detection unit comprises an optical fiber dichroic mirror, a diamond sample, an optical filter and a second optical fiber detector;
the laser generated by the optical fiber laser enters the optical power stabilizing and pulse modulating unit along the optical fiber to perform power stabilization and pulse modulation; the laser subjected to power stabilization and pulse control is reflected to a diamond sample along the optical fiber through an optical fiber dichroic mirror, NV color center electron spin ensemble of the diamond sample emits fluorescence after being excited by the laser, and the fluorescence sequentially passes through the optical fiber dichroic mirror and the optical filter along the optical fiber to reach the second optical fiber detector.
Preferably, the optical power stabilizing and pulse modulating unit comprises an optical fiber type adjustable 1/2 wave plate, an optical fiber type polarizer, an optical fiber acousto-optic modulator, a polarization beam splitter, a first optical fiber detector and a feedback adjusting system;
after laser generated by the optical fiber laser enters the optical power stabilizing and pulse modulating unit along the optical fiber, the laser is sequentially diffracted after passing through the optical fiber type adjustable 1/2 wave plate, the optical fiber type polarizer and the optical fiber acousto-optic modulator along the optical fiber to obtain 0-order and 1-order diffracted light, the 1-order diffracted light is divided into two paths along the optical fiber through the polarization beam splitter, one path reaches the first optical fiber detector along the optical fiber, and the other path leaves the optical power stabilizing and pulse modulating unit along the optical fiber and enters the diamond NV color center laser excitation and fluorescence detection unit;
The feedback adjusting system is electrically connected with the first optical fiber detector and the optical fiber acousto-optic modulator respectively.
Preferably, the feedback regulation system comprises a low-pass filter circuit, a proportional-integral-derivative controller, a signal generator and an acousto-optic modulator driver;
the input end of the low-pass filter circuit is connected with the output end of the first optical fiber detector, and the output end of the low-pass filter circuit is connected with the input end of the proportional-integral-derivative controller;
the output end of the proportional-integral-derivative controller is respectively connected with the input end of the signal generator and the amplitude voltage control port of the acoustic-optical modulator driver;
the output end of the signal generator is connected with the digital modulation port of the acousto-optic modulator driver; the output end of the acousto-optic modulator driver is connected with the optical fiber acousto-optic modulator
Preferably, the optical filter is a band-pass filter, the wavelength transmission range is 600-800nm, and the optical filter is fixed on the second optical fiber detector.
Preferably, the fiber laser generates monochromatic light with the wavelength of 532nm and the power of milliwatt, and the laser control current of the fiber laser is 110% -150% of the normal working current.
Preferably, the low-pass filter circuit adopts a passive LC low-pass filter, and the cut-off frequency is 400 MHz.
The invention also discloses an all-fiber NV color center sensing magnetic measurement method with stable and modulatable power, which specifically comprises the following steps:
s1, enabling the laser generated by the fiber laser to enter the optical power stabilizing and pulse modulating unit along the fiber to perform power stabilization and pulse modulation;
s2, reflecting the laser light which is subjected to power stabilization and pulse control to the diamond sample along the optical fiber through the optical fiber dichroic mirror;
s4, exciting the NV color center electron spin ensemble of the diamond sample by laser to emit fluorescence, and sequentially passing the fluorescence through an optical fiber dichroic mirror and an optical filter along an optical fiber to a second optical fiber detector; obtaining a fluorescence detection voltage signal on a second optical fiber detector;
preferably, step S1 specifically includes the following sub-steps:
s11, enabling laser generated by the fiber laser to sequentially pass through the fiber type adjustable 1/2 wave plate and the fiber type polarizer along the fiber to obtain linearly polarized light;
s12, diffracting the linearly polarized light after passing through the optical fiber acousto-optic modulator along the optical fiber to obtain 0-order and 1-order diffracted lights;
s13, dividing the 1 st order diffracted light into two paths along the optical fiber through a polarization beam splitter; one of the path optical fibers reaches a first optical fiber detector, converts a laser signal into a voltage signal, and obtains laser output with stable power through a feedback regulation system; the other path of the optical fiber leaves the optical power stabilizing and pulse modulating unit and enters the diamond NV color center laser excitation and fluorescence detection unit.
Preferably, the step S13 of obtaining the laser output with stable power through the feedback adjusting system specifically includes the following sub-steps:
s131, filtering a high-frequency part in a voltage signal obtained by the first optical fiber detector through a low-pass filter circuit, and inputting the voltage signal into a proportional-integral-derivative controller;
s132, comparing the input monitoring laser power voltage signal with a set reference voltage by the proportional-integral-derivative controller; and feeds back and outputs the data to the acousto-optic modulator driver and the signal generator;
s133, the acousto-optic modulator driver sends out a modulation signal according to the calculation of the proportional-integral-derivative controller, and modulates the power of the 1 st-order diffracted light to realize the stability of the laser power;
and S134, the signal generator generates pulse modulation on the output signal of the acousto-optic modulator driver by generating a pulse carrier signal and inputting the pulse carrier signal to the digital modulation port of the acousto-optic modulator driver.
The invention has the beneficial effects that:
1. the method realizes the power stabilization and modulation of the laser and the excitation of the diamond NV color center laser and the fluorescence detection in a sub-module manner, and avoids adding a complex optical path in the diamond NV color center ensemble sensing and measuring device main body.
2. The invention divides a small part of light from the light path of the laser by the polarization beam splitter to be used as a feedback signal of the light power, has no influence on the laser in the main light path, and can stabilize the laser power and simultaneously not attenuate.
3. The invention adopts an acousto-optic modulator to simultaneously stabilize and modulate the laser power, reduces the number of components, can improve the stability and reduce the volume and the cost of the device.
4. The invention uses the acousto-optic modulator to perform feedback regulation and pulse modulation, has simple equipment and does not need complex operation.
5. The optical path system adopts an all-fiber structure, is more stable compared with the traditional space optical structure, reduces the optical path volume and is beneficial to realizing the integration and miniaturization of the device.
The features and advantages of the present invention will be described in detail by embodiments in conjunction with the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of an all-fiber type NV color center sensing magnetic measurement system with stable and modulatable power.
FIG. 2 is a schematic diagram of a feedback regulation system according to an embodiment of the present invention.
Wherein: the device comprises a 1-optical fiber laser, a 2-optical fiber, a 3-optical fiber type adjustable 1/2 wave plate, a 4-optical fiber type polarizer, a 5-optical fiber type acousto-optic modulator, a 6-polarization beam splitter, a 7-first optical fiber detector, an 8-feedback adjusting system, an 801-low-pass filter circuit, an 802-proportion-integral-differential controller, a 803-signal generator, an 804-acousto-optic modulator driver, a 9-optical fiber dichroic mirror, a 10-diamond sample, an 11-filter and a 12-second optical fiber detector.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood, however, that the detailed description herein of specific embodiments is intended to illustrate the invention and not to limit the scope of the invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Referring to fig. 1, the all-fiber NV color center sensing magnetic measurement system with stable and modulatable power comprises a fiber laser 1, wherein monochromatic laser is provided for a diamond NV color center laser excitation and fluorescence detection system; a multimode polarization maintaining fiber 2; the optical fiber type adjustable 1/2 wave plate 3 and the optical fiber type polarizer 4 convert the laser into linearly polarized light with adjustable power; an optical fiber type acousto-optic modulator 5 for generating Bragg diffraction to the laser and modulating +1 st order diffraction power; the polarization beam splitter 6 divides the main beam into two beams of light which are respectively used as a power signal detection light source and a subsequent working light source; the first optical fiber detector 7 detects laser power and converts an optical power signal into an electric signal; the feedback regulating system 8 controls the driving voltage input to the optical fiber acousto-optic modulator in real time to realize the stabilization and modulation of the laser power; a fiber dichroic mirror 9 that reflects excitation light and transmits fluorescence; a diamond sample 10, which undergoes a fluorescence reaction; a filter 11 for isolating the excitation light; and a second fiber detector 12 for collecting fluorescence detection voltage signals.
The feedback adjusting system 8 is shown in fig. 2, and includes a low-pass filter circuit 801 for filtering out high-frequency components in the signal to obtain laser power information before pulse modulation; a proportional-integral-derivative controller 802 that compares the laser power with a set power and calculates a feedback voltage; a signal generator 803 providing pulsed digital levels for the acousto-optic modulator driver; the acousto-optic modulator driver 804 realizes the pulse modulation function according to the voltage provided by the signal generator, and sends out a modulation signal according to the calculation of the proportional-integral-derivative controller, and modulates the power of +1 order diffraction light to realize the laser power stabilization.
The invention relates to an all-fiber NV color center sensing magnetic measurement method with stable and modulatable power, which specifically comprises the following steps:
s1, enabling the laser generated by the fiber laser 1 to enter the optical power stabilizing and pulse modulating unit along the fiber 2 for power stabilization and pulse modulation;
s2, reflecting the laser light which is subjected to power stabilization and pulse control to the diamond sample 10 along the optical fiber 2 through the optical fiber dichroic mirror 9 along the optical fiber 2;
s4, the NV color center electron spin ensemble of the diamond sample 10 emits fluorescence after being excited by laser, and the fluorescence sequentially passes through the optical fiber dichroic mirror 9, the optical filter 11 and the second optical fiber detector 12 along the optical fiber 2; obtaining a fluorescence detection voltage signal on the second optical fiber detector 12;
In a possible embodiment, step S1 specifically includes the following sub-steps:
s11, the laser generated by the fiber laser 1 passes through the fiber type adjustable 1/2 wave plate 3 and the fiber type polarizer 4 in sequence along the fiber 2 to obtain linearly polarized light;
s12, diffracting the linearly polarized light after passing through the optical fiber acousto-optic modulator 5 along the optical fiber 2 to obtain 0-order and 1-order diffracted lights;
s13, the 1 st order diffracted light is divided into two paths along the optical fiber 2 through the polarization beam splitter 6; one of the path of optical fiber 2 reaches a first optical fiber detector 7, converts the laser signal into a voltage signal, and obtains laser output with stable power through a feedback adjusting system 8; the other path leaves the optical power stabilization and pulse modulation unit along the optical fiber 2 and enters the diamond NV color center laser excitation and fluorescence detection unit.
In a possible embodiment, the step of obtaining a laser output with stable power through the feedback adjusting system 8 in step S13 specifically includes the following sub-steps:
s131, filtering a high-frequency part in a voltage signal obtained by the first optical fiber detector 7 through a low-pass filter circuit 801, and inputting the voltage signal into a proportional-integral-derivative controller 802;
s132, the pid controller 802 compares the input monitored laser power voltage signal with a set reference voltage; and feeds back and outputs the data to the acousto-optic modulator driver 804 and the signal generator 803;
S133, the acousto-optic modulator driver 804 sends out a modulation signal according to the calculation of the proportional-integral-derivative controller 802, and modulates the power of the 1 st-order diffracted light to realize the stability of the laser power;
s134, the signal generator 803 generates a pulse carrier signal and inputs the pulse carrier signal to the digital modulation port of the acousto-optic modulator driver 804, so that the output signal of the acousto-optic modulator driver 804 is pulse modulated.
The embodiment is as follows:
the fiber laser 1 generates monochromatic light with the wavelength of 532nm, linear polarized light required by the normal work of an acousto-optic modulator is obtained through the fiber type adjustable 1/2 wave plate 3 and the fiber type polarizer 4, the power required by a system can be adjusted through rotating the fast axis direction of the adjustable 1/2 wave plate 3, the linear polarized light is diffracted after passing through the installed fiber acousto-optic modulator 5 in a working state and is divided into 0-level and 1-level diffracted light, the signal generator 803 inputs a digital modulation port of an acousto-optic modulator driver through generating a pulse carrier signal to enable an output signal of the acousto-optic modulator driver to generate pulse modulation, the 1-level diffracted light is divided into two beams after passing through the polarization beam splitter 6 after pulse modulation, one beam of the two beams of light reaches the first fiber detector 7, the laser signal is converted into a voltage signal and high-frequency components in the signal are filtered through the low-pass filter circuit 801, the power of the 1 st-order diffraction light is accurately regulated and controlled in real time by controlling the output power of the acousto-optic modulator driver 804 through real-time feedback when the power is input into the proportional-integral-derivative controller 802, and then the laser output with stable power is obtained; the other beam of light split by the polarization beam splitter 6 reflects excitation laser with the wavelength of 532nm to a diamond sample 10 through an optical fiber dichroic mirror 9, and NV color center electron spin ensemble excited by the 532nm laser emits fluorescence with the wavelength of 600-800 nm. The emitted fluorescence passes through the fiber dichroic mirror 9, then passes through the 650nm long-pass filter 11 to isolate laser, and a fluorescence detection voltage signal is obtained on the second fiber detector 12.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. An all-fiber NV color center sensing magnetic measurement system with stable and modulatable power is characterized in that: the device comprises an optical fiber laser (1), a light power stabilizing and pulse modulating unit, a diamond NV color center laser excitation and fluorescence detection unit and an optical fiber (2);
the optical fiber laser (1), the optical power stabilizing and pulse modulating unit and the diamond NV color center laser excitation and fluorescence detection unit are connected through an optical fiber (2);
the diamond NV color center laser excitation and fluorescence detection unit comprises an optical fiber dichroic mirror (9), a diamond sample (10), an optical filter (11) and a second optical fiber detector (12);
laser generated by the optical fiber laser (1) enters an optical power stabilizing and pulse modulating unit along an optical fiber (2) to be subjected to power stabilization and pulse modulation; laser through power stabilization and pulse control passes through optic fibre dichroic mirror (9) along optic fibre (2) with laser along optic fibre (2) reflection to diamond sample (10), the NV colour core electron spin ensemble of diamond sample (10) sends fluorescence after laser excitation, fluorescence passes through optic fibre dichroic mirror (9), light filter (11) to second optical fiber detector (12) along optic fibre (2) in proper order.
2. The all-fiber NV color center sensing magnetic measurement system of claim 1, wherein: the optical power stabilizing and pulse modulating unit comprises an optical fiber type adjustable 1/2 wave plate (3), an optical fiber type polarizer (4), an optical fiber acousto-optic modulator (5), a polarization beam splitter (6), a first optical fiber detector (7) and a feedback adjusting system (8);
after laser generated by the optical fiber laser (1) enters the optical power stabilizing and pulse modulating unit along the optical fiber (2), the laser sequentially passes through the optical fiber type adjustable 1/2 wave plate (3), the optical fiber type polarizer (4) and the optical fiber acousto-optic modulator (5) along the optical fiber (2) and then is diffracted to obtain 0-order and 1-order diffracted lights, the 1-order diffracted light is divided into two paths along the optical fiber (2) through the polarization beam splitter (6), one path reaches the first optical fiber detector (7) along the optical fiber (2), and the other path leaves the optical power stabilizing and pulse modulating unit along the optical fiber (2) and enters the diamond NV color center laser excitation and fluorescence detection unit;
the feedback adjusting system (8) is electrically connected with the first optical fiber detector (7) and the optical fiber acousto-optic modulator (5) respectively.
3. The all-fiber power-stabilized modulatable NV-color-center sensing magnetic measurement system of claim 2, wherein: the feedback regulation system (8) comprises a low-pass filtering circuit (801), a proportional-integral-derivative controller (802), a signal generator (803) and an acousto-optic modulator driver (804);
The input end of the low-pass filter circuit (801) is connected with the output end of the first optical fiber detector (7), and the output end of the low-pass filter circuit (801) is connected with the input end of the proportional-integral-derivative controller (802);
the output end of the proportional-integral-derivative controller (802) is respectively connected with the input end of the signal generator (803) and the amplitude voltage control port of the acoustic-optical modulator driver (804);
the output end of the signal generator (803) is connected with the digital modulation port of the acousto-optic modulator driver (804); the output end of the acousto-optic modulator driver (804) is connected with the optical fiber acousto-optic modulator (5).
4. The all-fiber power-stabilized modulatable NV-color-center sensing magnetic measurement system of claim 1, wherein: the optical filter (11) is a band-pass filter, the wavelength transmission range is 600-800nm, and the optical filter (11) is fixed on the second optical fiber detector (12).
5. The all-fiber power-stabilized modulatable NV-color-center sensing magnetic measurement system of claim 1, wherein: the fiber laser (1) generates monochromatic light with the wavelength of 532nm and the power of milliwatt, and the laser control current of the fiber laser (1) is 110% -150% of the normal working current.
6. The all-fiber power-stabilized modulatable NV colour-center sensing magnetic measurement system of claim 3, wherein: the low-pass filter circuit (801) adopts a passive LC low-pass filter, and the cut-off frequency is 400 MHz.
7. An all-fiber NV color center sensing magnetic measurement method with stable and modulatable power is characterized by comprising the following steps:
s1, enabling laser generated by the fiber laser (1) to enter an optical power stabilizing and pulse modulating unit along the fiber (2) for power stabilization and pulse modulation;
s2, reflecting the laser light which is subjected to power stabilization and pulse control to the diamond sample (10) along the optical fiber (2) through the optical fiber dichroic mirror (9) along the optical fiber (2);
s4, the NV color center electron spin ensemble of the diamond sample (10) emits fluorescence after being excited by laser, and the fluorescence sequentially passes through a fiber dichroic mirror (9) and a filter (11) along an optical fiber (2) to reach a second fiber detector (12); and obtaining a fluorescence detection voltage signal on a second optical fiber detector (12).
8. The all-fiber type NV color center sensing magnetic measurement method of claim 7, wherein the step S1 specifically comprises the following sub-steps:
S11, the laser generated by the fiber laser (1) passes through the fiber type adjustable 1/2 wave plate (3) and the fiber type polarizer (4) in sequence along the fiber (2) to obtain linearly polarized light;
s12, diffracting the linearly polarized light after passing through the optical fiber acousto-optic modulator (5) along the optical fiber (2) to obtain 0-order and 1-order diffracted lights;
s13, dividing the 1 st-order diffraction light into two paths along the optical fiber (2) through a polarization beam splitter (6); one of the road edge optical fibers (2) reaches a first optical fiber detector (7), converts a laser signal into a voltage signal, and obtains laser output with stable power through a feedback adjusting system (8); the other path of light leaves the light power stabilization and pulse modulation unit along the optical fiber (2) and enters the diamond NV color center laser excitation and fluorescence detection unit.
9. The all-fiber NV color center sensing magnetic measurement method as claimed in claim 8, wherein the step of obtaining the laser output with stable power through the feedback adjustment system (8) in step S13 specifically comprises the following sub-steps:
s131, filtering a high-frequency part in a voltage signal obtained by the first optical fiber detector (7) through a low-pass filter circuit (801) and inputting the voltage signal into a proportional-integral-derivative controller (802);
S132, the proportional-integral-derivative controller (802) compares the input monitoring laser power voltage signal with a set reference voltage; and feeds back and outputs the signals to an acousto-optic modulator driver (804) and a signal generator (803);
s133, the acousto-optic modulator driver (804) sends out a modulation signal according to the calculation of the proportional-integral-derivative controller (802), and modulates the power of 1-order diffracted light to realize stable laser power;
s134, the signal generator (803) generates pulse modulation on the output signal of the acousto-optic modulator driver (804) by generating a pulse carrier signal and inputting the pulse carrier signal to the digital modulation port of the acousto-optic modulator driver (804).
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| CN116625349A (en) * | 2023-07-26 | 2023-08-22 | 中国船舶集团有限公司第七〇七研究所 | Method for improving vibration performance of optical fiber compass |
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