Echo wall mode microcavity resonance frequency regulation and control method and system

Abstract

The invention relates to the technical field of resonant frequency control, in particular to an echo wall mode microcavity resonant frequency regulation and control method and system. The method comprises the following steps: analyzing resonant frequencies, temperature data and resonant wavelength movement amounts at different monitoring moments to obtain a coupling influence degree at each monitoring moment; according to the resonant frequency distribution in the moment neighborhood range of each monitoring moment, judging whether the moment neighborhood range needs to be prolonged or not; if yes, a target function of the resonant frequency change rate is constructed in combination with the corresponding preset time extension amount; according to the change trend of the preset time extension corresponding to the neighborhood range of the previous and later moments and the coupling influence degree distribution of different monitoring moments in the preset time extension, constructing a limiting condition of the target function, and obtaining the preset time extension; and the resonant frequency of the micro-cavity is regulated and controlled. According to the method, the accuracy of resonant frequency regulation and control is improved by obtaining the proper heating duration in the hot reflux regulation and control treatment.

Description

Technical Field

[0001] The present invention relates to the technical field of resonance frequency control, and in particular to a method and system for controlling the resonance frequency of a whispering gallery mode microcavity. Background Art

[0002] Whispering gallery mode optical microcavity temperature sensing is based on the change of the material refractive index and microcavity size caused by the change of ambient temperature. The two together cause the resonant wavelength of the resonant mode to shift, thereby achieving high-precision temperature detection. It mainly uses laser thermal reflow to cause controllable melting and reconstruction of the microcavity surface, directly correcting the optical path length through geometric deformation, and then adjusting the resonant frequency to suppress thermal noise and improve temperature sensing accuracy.

[0003] In the existing technology, the resonant frequency is controlled by the thermal reflux control method. The local thermal reflux control avoids global thermal disturbances. However, in the actual resonant frequency control, affected by environmental factors, the microcavity shape change and non-uniform thermal field caused by the coupling of thermal expansion and thermo-optical effect may bring about stress accumulation problems, and the adjustment accuracy of the microcavity resonant frequency is poor. Summary of the Invention

[0004] In order to solve the technical problem of poor adjustment accuracy of microcavity resonance frequency caused by stress accumulation due to environmental factors, the present invention aims to provide a method and system for regulating the resonance frequency of a whispering gallery mode microcavity. The technical solutions adopted are as follows: The present invention proposes a method and system for controlling the resonance frequency of a whispering gallery mode microcavity, the method comprising: Perform thermal reflow treatment on the whispering gallery mode microcavity to obtain the resonance frequency, temperature data, and resonance wavelength shift at each monitoring moment; According to the temperature data and the shift of the resonance wavelength at different monitoring moments, the thermal rate coefficient at each monitoring moment is obtained; According to the distribution of thermal rate coefficients at different monitoring moments, the mode influence coefficient at each monitoring moment is obtained; according to the mode influence coefficient at each monitoring moment and the distribution of resonance frequencies at different monitoring moments, the coupling influence degree at each monitoring moment is obtained; Based on the distribution of resonance frequencies within the time neighborhood of each monitoring moment, determine whether the time neighborhood needs to be extended; if necessary, construct an objective function for the resonance frequency change rate based on the distribution of resonance frequencies within the time neighborhood of each monitoring moment and the corresponding preset time extension; based on the change trend of the preset time extension corresponding to the previous and next time neighborhoods and the distribution of the coupling influence degree of different monitoring moments in the preset time extension, construct the constraint conditions of the objective function to obtain the preset time extension; The resonance frequency of the microcavity is regulated according to the preset time extension amount.

[0005] Furthermore, the method for obtaining the thermal rate coefficient includes: The difference in temperature data between each monitoring moment and the previous moment and the ratio of the change in the resonant wavelength movement at each monitoring moment are obtained and normalized to obtain the thermal rate coefficient at each monitoring moment.

[0006] Furthermore, the method for obtaining the mode influencing coefficient includes: Obtain the average thermal rate coefficient of all monitoring moments in the continuous time range of each monitoring moment as the average thermal rate level; In the continuous time range where each monitoring moment is located, select other monitoring moments with the same thermal change rate coefficient as that of each monitoring moment, and use the corresponding other monitoring moments as target monitoring moments; calculate the mean difference between all target monitoring moments and the center moment in the continuous time range where each monitoring moment is located, and use the absolute value of the mean difference as the degree of time variation dispersion; The pattern influence coefficient at each monitoring moment is obtained based on the rate difference between the thermal change rate coefficient and the average thermal change rate level, as well as the degree of time variation dispersion. The rate difference is negatively correlated with the pattern influence coefficient, while the degree of time variation dispersion is positively correlated with the pattern influence coefficient.

[0007] Furthermore, the method for obtaining the mode influencing coefficient includes: The ratio of the rate difference and the time variation discreteness is obtained and negative correlation mapping is performed as the mode influence coefficient at each monitoring moment.

[0008] Furthermore, the method for obtaining the coupling influence degree includes: Obtain the resonance frequency range of all monitoring moments within each continuous time range as the frequency variation range; Obtain the mean of the corresponding frequency variation range within all continuous time ranges as the average variation range; The coupling influence degree at each monitoring moment is obtained based on the mode influence coefficient at each monitoring moment and the range difference between the frequency variation range and the average variation range at each monitoring moment. The mode influence coefficient is positively correlated with the coupling influence degree, while the range difference is negatively correlated with the coupling influence degree.

[0009] Furthermore, the determining whether the initial heating time needs to be extended includes: If the difference in the resonant frequency between the end and the head within the time neighborhood range at each monitoring moment is greater than a preset difference threshold, it is determined that the time neighborhood range needs to be extended.

[0010] Furthermore, the method for obtaining the objective function includes: The ratio of the difference in the resonance frequency between the end and the head end within the time neighborhood of each monitoring moment and the preset time extension amount is obtained, and the minimum function is taken as the target function of the resonance frequency change rate.

[0011] Furthermore, the method for obtaining the restriction condition includes: The first restriction condition is that the preset time extension amount of the neighborhood range at each moment is greater than the preset time extension amount of the neighborhood range at the previous moment; The average coupling influence degree of all monitoring moments within the preset time extension corresponding to the neighborhood range at each moment is obtained as the average coupling influence level; the average coupling influence level corresponding to the neighborhood range at each moment is greater than the average coupling influence level corresponding to the neighborhood range at the previous moment, which is used as the second restriction condition.

[0012] Furthermore, the preset difference threshold is zero.

[0013] The present invention also proposes a whispering gallery mode microcavity resonance frequency control system, comprising a memory, a processor, and a computer program stored in the memory and runnable on the processor. When the processor executes the computer program, it implements any one of the steps of the whispering gallery mode microcavity resonance frequency control method.

[0014] The present invention has the following beneficial effects: The present invention analyzes the resonant frequency, temperature data and resonant wavelength shift at different monitoring moments, obtains the coupling influence degree of each monitoring moment, analyzes the influence of the interaction between the microcavity thermo-optical effect and the thermal expansion effect on the resonant frequency; according to the resonant frequency distribution within the neighborhood range of each monitoring moment, determines whether the neighborhood range needs to be extended, and can dynamically adjust the time window of the analysis; if necessary, in combination with the corresponding preset time extension, constructs an objective function of the resonant frequency change rate; according to the changing trend of the preset time extension corresponding to the neighborhood range of the previous and next moments, and the coupling influence degree distribution at different monitoring moments in the preset time extension, constructs the constraint conditions of the objective function, obtains the preset time extension, comprehensively considers the changing trend of the neighborhood range of the previous and next moments and the coupling influence degree distribution, makes the obtained preset time extension more reasonable and accurate, can more comprehensively observe and analyze the resonant frequency change trend of the microcavity over a long time; realizes the regulation of the resonant frequency of the microcavity, and realizes the fine regulation of the resonant frequency of the microcavity by reasonably controlling the timing and duration of the thermal relaxation pause. The present invention improves the accuracy of the resonant frequency regulation by obtaining a suitable heating time in the heat reflux regulation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions and advantages of the embodiments of the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 A flowchart of a method for controlling the resonance frequency of a whispering gallery mode microcavity provided by one embodiment of the present invention; Figure 2 A flow chart of a method for obtaining a mode influencing coefficient provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0017] To further illustrate the technical means and effectiveness of the present invention in achieving its intended purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, describes in detail the specific implementation, structure, features, and effectiveness of a whispering gallery mode microcavity resonant frequency control method and system proposed in accordance with the present invention. In the following description, different references to "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.

[0018] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0019] The specific scheme of the method and system for controlling the resonance frequency of a whispering gallery mode microcavity provided by the present invention will be described in detail below with reference to the accompanying drawings.

[0020] See also Figure 1 , which shows a method flow chart of a method for controlling the resonance frequency of a whispering gallery mode microcavity provided by one embodiment of the present invention, specifically comprising: Step S1: performing thermal reflow treatment on the whispering gallery mode microcavity to obtain the resonance frequency, temperature data and the shift of the resonance wavelength at each monitoring moment.

[0021] In an embodiment of the present invention, considering that the resonance frequency regulation process may be affected by environmental factors, which significantly affect the fineness of control, it is necessary to analyze the overall control influencing factors of the reflux adjustment process. First, a tunable semiconductor laser with a wavelength of 1550nm and a power stability of ±0.1% is used to perform thermal reflux laser regulation of the microcavity resonance frequency. A micro-thermocouple array is set to detect local temperature data of the microcavity area within a diameter of 50μm with a response time of <1ms. A wavelength-tunable scanning laser is set, and the resonant wavelength is obtained by Lorentz line fitting, and the resonant wavelength shift is also obtained. Therefore, the whispering gallery mode microcavity is subjected to thermal reflux treatment, and the resonant frequency, temperature data, and resonant wavelength shift are obtained at each monitoring moment.

[0022] It should be noted that, in the embodiments of the present invention, in order to facilitate subsequent processing of the data and avoid differences in units and numerical magnitudes between the data, the data is standardized to eliminate the influence of dimensions in data calculations.

[0023] Step S2: Based on the temperature data and the resonant wavelength shift at different monitoring moments, the thermal rate coefficient at each monitoring moment is obtained; based on the distribution of the thermal rate coefficient at different monitoring moments, the mode influence coefficient at each monitoring moment is obtained; based on the distribution of the mode influence coefficient at different monitoring moments, the coupling influence degree at each monitoring moment is obtained.

[0024] Temperature data is used to analyze the status of thermal effects, and the wavelength shift can provide an intuitive understanding of changes in the optical properties of the microcavity. During the thermal reflux adjustment process, the thermal expansion effect increases the size of the microcavity by increasing the temperature, resulting in a redshift in the resonant wavelength. The thermo-optical effect is caused by the increase in laser irradiation temperature, which changes the refractive index of the material and causes a wavelength shift. Therefore, the more consistent the relationship between the temperature and the resonant wavelength, the more obvious the thermo-optical effect at the monitoring time. The thermal change trend is analyzed by using temperature data and the resonant wavelength shift at different monitoring times.

[0025] Preferably, the greater the temperature data change, the greater the wavelength shift is affected by temperature, and the more the thermo-optical effect occurs. In one embodiment of the present invention, the method for obtaining the thermal change rate coefficient includes: The difference in temperature data between each monitoring moment and the previous moment and the ratio of the change in the resonance wavelength at each monitoring moment to the change in the movement of the resonance wavelength at each monitoring moment are obtained and normalized to obtain the thermal rate coefficient at each monitoring moment.

[0026] It should be noted that, in the embodiment of the present method, normalization is performed by linear normalization or a normalization function, and the specific means are technical means well known to those skilled in the art and will not be described in detail here.

[0027] Taking into account the distribution of the thermal rate coefficient within the continuous time range, it can more comprehensively reflect the changes in the mode characteristics of the microcavity under different thermal states; the thermal rate coefficient reflects the coupling influence level of the thermo-optical effect and the thermal expansion effect. The greater the change in the thermal rate coefficient, the tighter the change occurs, the rapidly changing system is in a non-equilibrium state, and the less affected by the coupling. According to the distribution of the thermal rate coefficient at different monitoring moments, the mode influence coefficient at each monitoring moment is obtained.

[0028] Preferably, in one embodiment of the present invention, the method for obtaining the mode influence coefficient is as follows: Figure 2 , which shows a flow chart of a method for obtaining a pattern imaging coefficient, including: Step S201: obtaining the average value of the thermal rate coefficients of all monitoring moments in the continuous time range where each monitoring moment is located as the average thermal rate level.

[0029] In order to conduct more refined local targeted analysis, multiple continuous time ranges divided by all monitoring moments are obtained; it should be noted that, in one embodiment of the present invention, the monitoring moments within each 300S range are divided into a continuous time range in chronological order; the overall thermal change rate level within the continuous time range is quantified by taking the average value to provide reference data for subsequent comparison.

[0030] Step S202: In the continuous time range where each monitoring moment is located, select other monitoring moments with the same thermal change rate coefficient value as that of each monitoring moment, and use the corresponding other monitoring moments as target monitoring moments; calculate the mean difference between all target monitoring moments and the center moment in the continuous time range where each monitoring moment is located, and use the absolute value of the mean difference as the degree of time variation dispersion.

[0031] By limiting the analysis to the continuous time range of each monitoring moment, the dynamic changes of the microcavity resonance frequency in the local time can be observed in more detail.

[0032] In the continuous time range of each monitoring moment, the thermal rate coefficient with the same value reflects that the microcavity has consistent coupling behavior at these monitoring moments. Selecting these moments as target monitoring moments can focus on the microcavity state with the same thermal response characteristics and eliminate the interference of other moments with large thermal response differences, thereby more accurately analyzing the relationship between the resonant frequency change and the thermal effect; the difference between all target monitoring moments and the center moment in the continuous time range of each monitoring moment can reflect the overall deviation. The larger the absolute value of the difference mean, the looser the moment variation and the more discrete the time variation.

[0033] Step S203: Based on the rate difference between the thermal change rate coefficient and the average thermal change rate level at each monitoring moment, as well as the degree of time variation dispersion, the pattern influence coefficient at each monitoring moment is obtained. The rate difference is negatively correlated with the pattern influence coefficient, and the degree of time variation dispersion is positively correlated with the pattern influence coefficient.

[0034] It should be noted that the rate difference between the thermal rate coefficient and the average thermal rate level reflects the deviation of the thermal rate at each monitoring moment from the overall level. The larger the rate difference, the greater the deviation from the overall level, the greater the thermal dynamic nonlinearity, the lower the mode coupling efficiency, and the smaller the impact. The time variation dispersion reflects the compactness of temporal variations. The larger the dispersion, the smaller the compactness, the greater the mode coupling efficiency, and the greater the impact. Therefore, the rate difference is negatively correlated with the mode influence coefficient, while the time variation dispersion is positively correlated with the mode influence coefficient.

[0035] In one embodiment of the present invention, the ratio of the rate difference and the time variation discreteness is obtained, and a negative correlation mapping is performed as the pattern influence coefficient at each monitoring moment; therefore, a correlation between the rate difference and the time variation discreteness and the pattern influence coefficient is constructed based on the above basic mathematical operations, that is, the greater the rate difference, the smaller the time variation discreteness, and the smaller the pattern influence coefficient.

[0036] It should be noted that, in one embodiment of the present invention, an exponential function with a natural constant as the base is used. In other embodiments of the present invention, negative correlation mapping can also be performed by finding the inverse. The specific means are well known to those skilled in the art and will not be described in detail here.

[0037] For the actual change in resonance frequency caused by the coupling of thermal expansion and thermo-optical effect, the stage-by-stage proportional change itself is regular. The smaller the random influence, the greater the reference credibility, and the greater the coupling influence. However, affected by the reflux control process and the non-uniform temperature field, the more random the resonance frequency drift, the more uneven the resonance frequency distribution, and the smaller the coupling effect. The mode influence coefficient reflects the coupling influence of the thermo-optical effect and the thermal expansion effect. Therefore, the degree of coupling influence at each monitoring moment is obtained based on the mode influence coefficient at each monitoring moment and the resonance frequency distribution at different monitoring moments.

[0038] Optimally, in one embodiment of the present invention, the method for obtaining the coupling influence degree includes: obtaining the resonance frequency extreme difference of all monitoring moments within each continuous time range as the frequency variation range; Obtain the mean of the corresponding frequency variation range within all continuous time ranges as the average variation range; The coupling influence degree at each monitoring moment is obtained based on the mode influence coefficient at each monitoring moment and the range difference between the frequency variation range and the average variation range at each monitoring moment. The mode influence coefficient is positively correlated with the coupling influence degree, while the range difference is negatively correlated with the coupling influence degree.

[0039] It should be noted that the change in the resonant frequency is reflected by analyzing the frequency change range. The difference between the frequency change range and the average change range at each monitoring moment reflects the deviation of the resonant frequency change at each monitoring moment relative to the overall change. The larger the deviation, the less close it is to the overall change, and the smaller the impact on the coupling effect.

[0040] In one embodiment of the present invention, the pattern influence coefficient at each monitoring moment and the ratio of the range difference corresponding to each monitoring moment are obtained, and normalized mapping is performed as the coupling influence degree at each monitoring moment; wherein, in order to avoid the denominator of the formula being 0, a threshold value such as 0.01 is artificially added to the denominator; therefore, a correlation between the pattern influence coefficient, the range difference and the coupling influence degree is constructed based on the above basic mathematical operations, that is, the larger the pattern influence coefficient, the smaller the range difference, the greater the coupling influence of the thermo-optical effect and the thermal expansion effect, and the greater the reference credibility for subsequent processing.

[0041] Step S3: Based on the resonant frequency distribution within the time neighborhood range of each monitoring moment, determine whether the time neighborhood range needs to be extended; if necessary, construct an objective function of the resonant frequency change rate based on the resonant frequency distribution within the time neighborhood range of each monitoring moment and the corresponding preset time extension; based on the changing trend of the preset time extension corresponding to the previous and next time neighborhood ranges and the distribution of the coupling influence degree, construct the constraint conditions of the objective function to obtain the preset time extension.

[0042] Since the change in microcavity shape caused by the thermal reflow laser is the coupling effect of thermal expansion and thermo-optical effect, it will be affected by environmental factors in the actual control process, resulting in changes in the resonant wavelength. For the actual microcavity resonant frequency control process, the more stable the resonant wavelength change, the better, that is, the more fixed the resonant frequency. Taking into account the random influence of actual environmental factors, according to the cumulative influence of the thermal reflow control sequence, the more the resonant frequency changes, the more necessary the heating time control is. Based on the distribution of resonant frequencies within the time neighborhood range at each monitoring moment, it is determined whether the time neighborhood range needs to be extended.

[0043] Preferably, in one embodiment of the present invention, determining whether the time neighborhood range needs to be extended includes: If the difference in the resonant frequency between the end and the head within the time neighborhood range at each monitoring moment is greater than a preset difference threshold, it is determined that the time neighborhood range needs to be extended.

[0044] It should be noted that, in one embodiment of the present invention, the size of the time neighborhood range is the range consisting of the monitoring time after the initial heating time based on the monitoring time; in other embodiments of the present invention, the initial heating time and the size of the time neighborhood range can be set according to specific circumstances, and are not limited or elaborated here.

[0045] It should be noted that, in one embodiment of the present invention, the size of the preset difference threshold is 0; in other embodiments of the present invention, the size of the preset difference threshold can be set according to specific circumstances, which is not limited or elaborated here.

[0046] The purpose of regulating the resonant frequency is to maintain the stability of the resonant wavelength fluctuation. When no environmental factors are present, a fixed power extension heating method is used during the heat reflow control process. However, considering the randomness of actual environmental factors that may affect performance, it is necessary to construct an objective function based on the fluctuation of the resonant frequency and the preset time extension. This allows for accurate adjustment of the control precision of the heating time and a natural balance of frequency fluctuations. If necessary, an objective function for the resonant frequency change rate can be constructed based on the resonant frequency distribution within the neighborhood of each monitoring moment and the corresponding preset time extension.

[0047] Preferably, in one embodiment of the present invention, the method for obtaining the objective function includes: The ratio of the difference in the resonance frequency between the end and the head end within the time neighborhood of each monitoring moment and the preset time extension amount is obtained, and the minimum function is taken as the target function of the resonance frequency change rate.

[0048] The time extension avoids oscillation or divergence of the heating strategy. Gradually extending the heating time conforms to the asymptotic characteristics of thermodynamics. The better the distribution of coupling influence at different monitoring moments is than the previous coupling balance, the better the subsequent control accuracy will be. According to the changing trend of the preset time extension corresponding to the neighborhood range of the previous and subsequent moments, and the distribution of coupling influence at different monitoring moments in the preset time extension, the constraint conditions of the objective function are constructed to obtain the preset time extension.

[0049] Preferably, in one embodiment of the present invention, the method for obtaining the restriction condition includes: The first restriction condition is that the preset time extension amount of the neighborhood range at each moment is greater than the preset time extension amount of the neighborhood range at the previous moment; The average coupling influence degree of all monitoring moments within the preset time extension corresponding to the neighborhood range at each moment is obtained as the average coupling influence level; the average coupling influence level corresponding to the neighborhood range at each moment is greater than the average coupling influence level corresponding to the neighborhood range at the previous moment, which is used as the second restriction condition.

[0050] Based on this, constructing the objective function of the resonant frequency change rate is transformed into an optimization problem. By solving the objective function, the optimal preset time extension can be found under certain conditions. The objective function is solved by an analytical method or a numerical optimization algorithm. The first constraint condition and the second constraint condition must be met at the same time so that the objective function reaches the minimum value and the solution value of the preset time extension is obtained; the data obtained at all monitoring moments in the control process are processed to obtain the average coupling influence level of the coupling influence degree at each monitoring moment on the preset time extension; the specific algorithm is a technical means well known to those skilled in the art and will not be elaborated here.

[0051] It should be noted that the heat reflow process is processed in chronological order, and the time extension amount after the time neighborhood range of each monitoring moment is obtained in sequence.

[0052] Step S4: According to the preset time extension amount, the resonance frequency of the microcavity is regulated.

[0053] Taking into account the random influence of actual environmental factors, a preset time extension is obtained. After the heating process in the neighborhood of the time is extended, a fixed-length thermal relaxation pause is performed. This helps control the thermal state of the microcavity, keeping it stable for a certain period of time, and helps avoid instability in the microcavity performance caused by continuous thermal effects. Furthermore, the material's thermal inertia is used to naturally balance the temperature field, achieving regulation of the resonant frequency of the whispering gallery mode microcavity, which helps improve the control accuracy of the microcavity resonant frequency. It should be noted that in one embodiment of the present invention, the fixed duration of the thermal relaxation pause is set to 10 seconds. In other embodiments of the present invention, the fixed duration can be set according to specific circumstances, which is not detailed here.

[0054] In summary, the present invention analyzes the resonant frequency, temperature data, and resonant wavelength shift at different monitoring moments to obtain the degree of coupling influence at each monitoring moment; based on the distribution of the resonant frequency within the time neighborhood of each monitoring moment, it is determined whether the time neighborhood range needs to be extended; if necessary, a target function for the rate of change of the resonant frequency is constructed in combination with the corresponding preset time extension; based on the changing trend of the preset time extension corresponding to the previous and next time neighborhood ranges, and the distribution of the degree of coupling influence at different monitoring moments within the preset time extension, the constraint conditions of the target function are constructed to obtain the preset time extension; and the regulation of the resonant frequency of the microcavity is achieved. The present invention improves the accuracy of the resonant frequency regulation by obtaining an appropriate heating time in the heat reflux regulation process.

[0055] The present invention also proposes a whispering gallery mode microcavity resonance frequency control system, which includes a memory, a processor, and a computer program stored in the memory and runnable on the processor. When the processor executes the computer program, it implements any one of the steps of a whispering gallery mode microcavity resonance frequency control method.

[0056] It should be noted that the order in which the embodiments of the present invention are described above is for illustrative purposes only and does not necessarily represent the superiority or inferiority of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the specific order or sequential order shown to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0057] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

Claims

1. A method for controlling the resonance frequency of a whispering gallery mode microcavity, characterized in that: The method comprises: Perform thermal reflow treatment on the whispering gallery mode microcavity to obtain the resonance frequency, temperature data, and resonance wavelength shift at each monitoring moment; Based on the temperature data and the resonant wavelength shift at different monitoring moments, the thermal rate coefficient at each monitoring moment is obtained; based on the distribution of the thermal rate coefficient at different monitoring moments, the mode influence coefficient at each monitoring moment is obtained; based on the mode influence coefficient at each monitoring moment and the resonant frequency distribution at different monitoring moments, the coupling influence degree at each monitoring moment is obtained; Based on the distribution of resonance frequencies within the time neighborhood of each monitoring moment, determine whether the time neighborhood needs to be extended; if necessary, construct an objective function for the resonance frequency change rate based on the distribution of resonance frequencies within the time neighborhood of each monitoring moment and the corresponding preset time extension; based on the change trend of the preset time extension corresponding to the previous and next time neighborhoods and the distribution of the coupling influence degree of different monitoring moments in the preset time extension, construct the constraint conditions of the objective function to obtain the preset time extension; The resonance frequency of the microcavity is regulated according to the preset time extension amount.

2. The method for controlling the resonance frequency of a whispering gallery mode microcavity according to claim 1, wherein: The method for obtaining the thermal rate coefficient includes: The difference in temperature data between each monitoring moment and the previous moment and the ratio of the change in the resonant wavelength movement at each monitoring moment are obtained and normalized to obtain the thermal rate coefficient at each monitoring moment.

3. The method for controlling the resonance frequency of a whispering gallery mode microcavity according to claim 1, wherein: The method for obtaining the mode influencing coefficient includes: Obtain the average thermal rate coefficient of all monitoring moments in the continuous time range of each monitoring moment as the average thermal rate level; In the continuous time range where each monitoring moment is located, select other monitoring moments with the same thermal change rate coefficient as that of each monitoring moment, and use the corresponding other monitoring moments as target monitoring moments; calculate the mean difference between all target monitoring moments and the center moment in the continuous time range where each monitoring moment is located, and use the absolute value of the mean difference as the degree of time variation dispersion; The pattern influence coefficient at each monitoring moment is obtained based on the rate difference between the thermal change rate coefficient and the average thermal change rate level, as well as the degree of time variation dispersion. The rate difference is negatively correlated with the pattern influence coefficient, while the degree of time variation dispersion is positively correlated with the pattern influence coefficient.

4. The method for controlling the resonance frequency of a whispering gallery mode microcavity according to claim 3, wherein: The method for obtaining the mode influencing coefficient includes: The ratio of the rate difference and the time variation discreteness is obtained and negative correlation mapping is performed as the mode influence coefficient at each monitoring moment.

5. The method for controlling the resonance frequency of a whispering gallery mode microcavity according to claim 1, wherein: The method for obtaining the coupling influence degree includes: Obtain the resonance frequency range of all monitoring moments within each continuous time range as the frequency variation range; obtain the mean of the corresponding frequency variation range within all continuous time ranges as the average variation range; The coupling influence degree at each monitoring moment is obtained based on the mode influence coefficient at each monitoring moment and the range difference between the frequency variation range and the average variation range at each monitoring moment. The mode influence coefficient is positively correlated with the coupling influence degree, while the range difference is negatively correlated with the coupling influence degree.

6. The method for controlling the resonance frequency of a whispering gallery mode microcavity according to claim 1, wherein: The determination of whether the neighborhood range needs to be extended includes: If the difference in the resonant frequency between the end and the head within the time neighborhood range at each monitoring moment is greater than a preset difference threshold, it is determined that the time neighborhood range needs to be extended.

7. The method for controlling the resonance frequency of a whispering gallery mode microcavity according to claim 1, wherein: The method for obtaining the objective function includes: The ratio of the difference in the resonance frequency between the end and the head end within the time neighborhood of each monitoring moment and the preset time extension amount is obtained, and the minimum function is taken as the target function of the resonance frequency change rate.

8. The method for controlling the resonance frequency of a whispering gallery mode microcavity according to claim 1, wherein: The method for obtaining the restriction condition includes: The first restriction condition is that the preset time extension amount of the neighborhood range at each moment is greater than the preset time extension amount of the neighborhood range at the previous moment; The average coupling influence degree of all monitoring moments within the preset time extension corresponding to the neighborhood range at each moment is obtained as the average coupling influence level; the average coupling influence level corresponding to the neighborhood range at each moment is greater than the average coupling influence level corresponding to the neighborhood range at the previous moment, which is used as the second restriction condition.

9. The method for controlling the resonance frequency of a whispering gallery mode microcavity according to claim 6, wherein: The preset difference threshold is zero.

10. A whispering gallery mode microcavity resonance frequency control system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method for controlling the resonance frequency of a whispering gallery mode microcavity as described in any one of claims 1 to 9 are implemented.

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