A control method and control device of an acousto-optic modulator

Abstract

The embodiment of the present invention discloses a control method and a control device for an acousto-optic modulator. The control method converts an electrical signal input to an acousto-optic modulator driving power supply by the control circuit by pre-setting a first conversion formula in a control circuit, so that the relationship between the electrical signal amplitude of a first driving voltage signal input to the control circuit and the diffraction efficiency is converted into a positively correlated linear relationship, so as to realize the linear output of the acousto-optic modulator. Therefore, when a customer uses the acousto-optic modulator as an optical switch device, the diffraction efficiency of the acousto-optic modulator can be controlled more conveniently and accurately, which is convenient for practical operation and application.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of laser technology, and in particular to a control method and a control device for an acousto-optic modulator. Background Art

[0002] The acousto-optic effect refers to the phenomenon that when light passes through a medium and the medium is disturbed by ultrasonic waves, the light will diffract. The acousto-optic modulator (AOM) is a modulation device based on the acousto-optic effect. Through the acousto-optic modulator, the intensity of the electrical signal can be converted into diffraction efficiency. With this device, multiple functions such as menu selection and optical switch can be realized in the laser optical path.

[0003] The acousto-optic modulator is generally composed of a medium, a transducer, and a driving power supply. When the acousto-optic modulator starts working, the control circuit first applies an electrical signal to the driving power supply. After receiving the electrical signal from the control circuit, the driving power supply generates another modulated electrical signal according to the strength of the electrical signal and applies it to the transducer; the transducer uses the inverse piezoelectric effect of certain piezoelectric crystals or piezoelectric semiconductors to convert the modulated electrical signal applied by the driving power supply into a mechanical wave; after the mechanical wave generated by the transducer passes through the medium, the diffraction efficiency of the medium changes with the intensity of the mechanical wave, and the light intensity is modulated through this change.

[0004] AOMs can generally be divided into Raman-Nath diffraction AOMs and Bragg diffraction AOMs. In Raman-Nath diffraction AOMs, the frequency of ultrasound waves is low, and the light wave is incident parallel to the acoustic wave surface. At this time, the medium can be regarded as a plane phase grating. In Bragg diffraction AOMs, the frequency of the sound waves is high, and there is a certain angle between the light wave and the acoustic wave incident surface. At this time, the medium can be regarded as a volume grating. Since the diffraction efficiency of the Bragg diffraction AOM is high, the Bragg diffraction AOM is mainly used in applications that pursue diffraction efficiency, such as optical switches.

[0005] In the Bragg diffraction acousto-optic modulator, the diffraction efficiency η is as shown in formula 1.1:

[0006]

[0007] In the formula, I 1 is the primary optical power, I 0 is the zero-order optical power, M is the quality factor of the acousto-optic material, P is the ultrasonic power, L is the transducer length, H is the transducer width, and λ is the wavelength of the incident light.

[0008] When the acousto-optic controller is used for an optical switch, the control circuit generally inputs an electrical signal with a maximum amplitude of 5V into the driving power supply, and controls the electrical power output by the driving power supply to the transducer through the amplitude of this signal, that is, the electrical power output by the driving power supply is proportional to the amplitude of the electrical signal input to the control circuit, so that the diffraction efficiency can be controlled by the amplitude of the electrical signal input to the controller.

[0009] From the above formula, we can see that the diffraction efficiency of the acousto-optic modulator is not linearly related to the ultrasonic power input to the medium, and the control circuit input signal and the transducer output power are not simply linearly related. These factors lead to the fact that the electrical signal input to the main control circuit is not in a simple linear relationship with the diffraction efficiency. Generally speaking, the relationship between the amplitude of the electrical signal input to the control circuit and the diffraction efficiency is as follows: Figure 1 As shown, the relationship between the amplitude of the electrical signal input from the control circuit to the driving power supply and the diffraction efficiency is not a simple linear relationship, but a more complicated one.

[0010] In the application of optical opening and closing, in order to pursue higher diffraction efficiency, it is generally hoped that a higher diffraction efficiency can be obtained, which causes the AOM to always work at a position with poor linearity, so that it is difficult for the control circuit to linearly control the AOM and it is difficult to accurately achieve power control. At the same time, since the characteristics of different AOMs are different, even if the same AOM is used under different conditions, its characteristics will have certain differences, so it is difficult to use a simple fixed formula to convert to achieve the linear output of the AOM. Summary of the invention

[0011] In view of this, an embodiment of the present invention provides a control method and a control device for an acousto-optic modulator, wherein an electrical signal input to an acousto-optic modulator driving power supply by a control circuit is converted by pre-designing a conversion formula that can input parameters in a control circuit, so as to achieve a linear relationship between the electrical signal input to the acousto-optic modulator by the control circuit and the diffraction efficiency of the acousto-optic modulator.

[0012] In a first aspect, an embodiment of the present invention provides a method for controlling an acousto-optic modulator, the method comprising:

[0013] receiving a first driving voltage signal;

[0014] The first driving voltage signal is converted into a second driving voltage signal according to a first conversion formula; the second driving voltage signal is positively correlated with the diffraction efficiency of the acousto-optic modulator;

[0015] The first conversion formula satisfies:

[0016]

[0017] Wherein, S1 is the first driving voltage signal, S2 is the second driving voltage signal, and the acousto-optic modulator includes a maximum diffraction efficiency; A n-1 The ratio of the diffraction efficiency of the AOM to the maximum diffraction efficiency is X n-1 The first driving voltage value when A n The ratio of the diffraction efficiency of the AOM to the maximum diffraction efficiency is X n The first driving voltage value when X n >X n-1 , A n >A n-1 , n>1, n is a positive integer;

[0018] The second driving voltage signal is output to the AOM.

[0019] Optionally, receiving a first driving voltage signal includes:

[0020] Converting the amplitude of the first driving voltage signal into a percentage signal;

[0021] Converting the first driving voltage signal into a second driving voltage signal according to a first conversion formula includes:

[0022] Converting the percentage signal into a second driving voltage signal according to a second conversion formula;

[0023] The second conversion formula satisfies:

[0024]

[0025] Wherein, S1′ is the percentage signal.

[0026] Optionally, the second driving voltage signal and the diffraction efficiency of the acousto-optic modulator satisfy the following relationship:

[0027] η*=C*S2+B,(1.3);

[0028] Wherein, η* is the diffraction efficiency of the AOM, S2 is the second driving voltage signal, B and C are constants, and C>0.

[0029] Optionally, before receiving the first driving voltage signal, the method further includes:

[0030] Establish the corresponding relationship between the ratio of the diffraction efficiency of the acousto-optic modulator to the maximum diffraction efficiency and the driving voltage value;

[0031] After receiving the first driving voltage signal and before converting the first driving voltage signal into the second driving voltage signal according to the first conversion formula, the method further includes:

[0032] The ratio of the diffraction efficiency of the AOM corresponding to the first driving voltage signal to the maximum diffraction efficiency is determined according to the first driving voltage signal.

[0033] Optionally, after establishing the corresponding relationship between the ratio of the diffraction efficiency of the acousto-optic modulator to the maximum diffraction efficiency and the driving voltage value, the method further includes:

[0034] Update the corresponding relationship between the ratio of the diffraction efficiency to the maximum diffraction efficiency of the AOM and the driving voltage value.

[0035] In a second aspect, an embodiment of the present invention further provides a control device for an acousto-optic modulator, which is used to execute the control method provided in the first aspect, and the control device includes:

[0036] A signal receiving module, used for receiving a first driving voltage signal;

[0037] A signal conversion module, configured to convert the first driving voltage signal into a second driving voltage signal according to a first conversion formula; the second driving voltage signal is positively correlated with the diffraction efficiency of the acousto-optic modulator;

[0038] The first conversion formula satisfies:

[0039]

[0040] Wherein, S1 is the first driving voltage signal, S2 is the second driving voltage signal, and the acousto-optic modulator includes a maximum diffraction efficiency; A n-1 The ratio of the diffraction efficiency of the AOM to the maximum diffraction efficiency is X n-1 The first driving voltage value when A n The ratio of the diffraction efficiency of the AOM to the maximum diffraction efficiency is X n The first driving voltage value when X n >X n-1 , A n >A n-1 , n>1, n is a positive integer;

[0041] A signal output module is used to output the second driving voltage signal to the acousto-optic modulator.

[0042] Optionally, also include:

[0043] A percentage conversion module, used for converting the amplitude of the first driving voltage signal into a percentage signal;

[0044] A second formula conversion module, used for converting the percentage signal into a second driving voltage signal;

[0045] The second conversion formula satisfies:

[0046]

[0047] Wherein, S1′ is the percentage signal.

[0048] Optionally, also include:

[0049] A database establishment module, used to establish a corresponding relationship between the ratio of the diffraction efficiency of the acousto-optic modulator to the maximum diffraction efficiency and the driving voltage value;

[0050] A ratio determination module is used to determine, after receiving a first driving voltage signal and before converting the first driving voltage signal into a second driving voltage signal according to a first conversion formula, a ratio of a diffraction efficiency of the acousto-optic modulator corresponding to the first driving voltage signal to a maximum diffraction efficiency according to the first driving voltage signal.

[0051] Optionally, also include:

[0052] The database updating module is used to update the corresponding relationship between the ratio of the diffraction efficiency of the acousto-optic modulator to the maximum diffraction efficiency and the driving voltage value.

[0053] The control method of the acousto-optic modulator provided by the embodiment of the present invention converts the electrical signal input to the acousto-optic modulator driving power supply by setting the first conversion formula in the control circuit in advance, so that the relationship between the electrical signal amplitude of the first driving voltage signal input to the control circuit and the diffraction efficiency is converted into a positively correlated linear relationship, so as to realize the linear output of the acousto-optic modulator. Therefore, when the customer uses the acousto-optic modulator as an optical switch device, the diffraction efficiency of the acousto-optic modulator can be controlled more conveniently and accurately, which is convenient for practical operation and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0055] Figure 1 A schematic diagram of the relationship between a driving voltage signal and its corresponding diffraction efficiency in an existing acousto-optic modulator;

[0056] Figure 2 A schematic diagram of the relationship between the driving voltage signal and the corresponding diffraction efficiency in the optical modulator provided by the present invention;

[0057] Figure 3 A schematic flow chart of a control method of an acousto-optic modulator provided in an embodiment of the present invention;

[0058] Figure 4 A schematic flow chart of another method for controlling an acousto-optic modulator provided by an embodiment of the present invention;

[0059] Figure 5 A schematic flow chart of another method for controlling an acousto-optic modulator provided by an embodiment of the present invention;

[0060] Figure 6 A structural block diagram of a control device for an acousto-optic modulator provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be fully described below in combination with the drawings in the embodiments of the present invention through specific implementation methods. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work fall within the protection scope of the present invention.

[0062] Example

[0063] The embodiment of the present invention provides a control method for an acousto-optic modulator, which can realize that an electrical signal input into the acousto-optic modulator by a control circuit is in a linear relationship with the diffraction efficiency of the acousto-optic modulator. Figure 2 A schematic diagram of the relationship between the driving voltage signal and the corresponding diffraction efficiency in the optical modulator provided by the present invention; Figure 3 A flow chart of a control method of an acousto-optic modulator provided by an embodiment of the present invention. Figure 2 and Figure 3 As shown, an embodiment of the present invention provides a method for controlling an acousto-optic modulator, the method comprising:

[0064] Step S101: receiving a first driving voltage signal.

[0065] Step S102: converting the first driving voltage signal into a second driving voltage signal according to a first conversion formula; the second driving voltage signal is positively correlated with the diffraction efficiency of the AOM.

[0066] The first conversion formula satisfies:

[0067]

[0068] Wherein, S1 is the first driving voltage signal, S2 is the second driving voltage signal, and the acousto-optic modulator includes a maximum diffraction efficiency; A n-1 The ratio of the diffraction efficiency of the AOM to the maximum diffraction efficiency is X n-1 The first driving voltage value when A n The ratio of the diffraction efficiency of the AOM to the maximum diffraction efficiency is X n The first driving voltage value when X n >X n-1 , An >A n-1 , n>1, n is a positive integer.

[0069] Step S103: output a second driving voltage signal to the AOM.

[0070] Exemplarily, the control circuit receives a first driving voltage signal S1, which may be a voltage value, a current value, etc., for example, a 0-5V voltage signal. Since the first driving voltage signal S1 and the diffraction efficiency η of the AOM are not in a simple linear relationship, and the relationship is relatively complex, the embodiment of the present invention creatively converts the input first driving voltage signal S1 into a second driving voltage signal S2 through a first conversion formula 1.1, and then inputs the second driving voltage signal S2 into a driving power supply of the AOM, and the driving power supply drives the AOM to modulate the light intensity according to the input second driving voltage signal S2.

[0071] The following is an example of fitting using five line segments, illustrating that the first conversion formula provided in the embodiment of the present invention converts the first driving voltage signal into the second driving voltage signal, and the second driving voltage signal satisfies a positively correlated linear relationship with the diffraction efficiency of the acousto-optic modulator. It should be noted that the number of line segments may be increased or decreased as needed in the specific implementation.

[0072] The maximum diffraction efficiency of the acousto-optic modulator is obtained as η max , maximum diffraction efficiency η max The corresponding first driving voltage value is A max , the diffraction efficiency of the AOM is selected to be 0.1η max , 0.5η max , 0.7η max , 0.9η max When the ratio of the diffraction efficiency of the AOM to the maximum diffraction efficiency is 0.1, the first driving voltage value is A 1 The first driving voltage value when the ratio of the diffraction efficiency of the AOM to the maximum diffraction efficiency is 0.5 is A 2 , the first driving voltage value when the ratio of the diffraction efficiency of the light modulator to the maximum diffraction efficiency is 0.7 is A 3 , the first driving voltage value when the ratio of the diffraction efficiency of the AOM to the maximum diffraction efficiency is 0.9 is A 4 , where A max >A 4 >A 3 >A 2 >A 1 At this time, the five segment fitting intervals are: [0, A 1 ), [A 1 , A 2 ), [A2 , A 3 ), [A 3 , A 4 ), [A 4 , A max ), according to the first conversion formula:

[0073]

[0074] Substituting Amax, A4, A3, A2, A1 and 0.1, 0.5, 0.7, 0.9, 1 respectively, the fitting formulas of the five line segment fitting intervals are:

[0075] When 0≤S1<A1, the first conversion formula is:

[0076] When A1≤S1<A2, the first conversion formula is:

[0077] When A2≤S1<A3, the first conversion formula is:

[0078] When A3≤S1<A4, the first conversion formula is:

[0079] When A4≤S1<Amax, the first conversion formula is:

[0080]

[0081] At this time, when the first driving voltage signal input by the user through the control circuit is a value S1, S1 can be the amplitude or value of the voltage. After judging the first driving voltage signal S1 and the preset 5 line segment fitting intervals, the control circuit selects one of the corresponding formulas (1.1.1), (1.1.2), (1.1.3), (1.1.4) or (1.1.5) according to the judgment result, converts the first driving voltage signal S1 and outputs the second driving voltage signal S2 to the driving power supply of the acousto-optic modulator. The driving power supply drives the acousto-optic modulator to modulate the light intensity according to the input second driving voltage signal S2.

[0082] After experimental testing and verification, Figure 2 As shown, the relationship between the electric signal amplitude of the first driving voltage signal S1 input to the control circuit and the diffraction efficiency η can be converted into a positive correlation linear relationship. Figure 1 On the basis of the AOM shown in the figure, the solution provided in the embodiment of the present invention can well convert the amplitude of the electric signal and the diffraction efficiency into a linear relationship, thereby realizing the linear output of the AOM.

[0083] In summary, the control method of the acousto-optic modulator provided by the embodiment of the present invention converts the electrical signal input to the acousto-optic modulator driving power supply by the control circuit by pre-setting the first conversion formula in the control circuit, so that the relationship between the electrical signal amplitude of the first driving voltage signal input to the control circuit and the diffraction efficiency is converted into a positively correlated linear relationship, so as to realize the linear output of the acousto-optic modulator, so that when the customer uses the acousto-optic modulator as an optical switch device, the diffraction efficiency of the acousto-optic modulator can be controlled more conveniently and accurately.

[0084] Figure 4 A flow chart of another method for controlling an acousto-optic modulator provided by an embodiment of the present invention. Figure 4 As shown, optionally, another method for controlling an acousto-optic modulator provided by an embodiment of the present invention includes:

[0085] Step S201: convert the amplitude of the first driving voltage signal into a percentage signal.

[0086] Step S201: convert the percentage signal into a second driving voltage signal according to a second conversion formula; the second driving voltage signal is positively correlated with the diffraction efficiency of the AOM.

[0087] The second transformation formula satisfies:

[0088]

[0089] Among them, S1′ is a percentage signal.

[0090] Step S203: output a second driving voltage signal to the AOM.

[0091] Exemplarily, in order to further facilitate the user to input the driving voltage value, the amplitude of the first driving voltage signal S1 of 0-5V can be converted into a percentage signal S1′ according to the third conversion formula, that is, when the percentage signal S1′=0, the amplitude of the electric signal input to the driving power supply by the control circuit is 0V, and the diffraction efficiency η of the corresponding acousto-optic modulator is 0; when the percentage signal S1′=100, the amplitude of the electric signal input to the driving power supply by the control circuit is 5V, and the maximum diffraction efficiency η of the corresponding acousto-optic modulator is max is 1; when the value of S1′ is A, and A satisfies 0≤A≤100, the diffraction efficiency at this time should be η=A%*η max Through this conversion, the amplitude of the electrical signal input from the control circuit to the driving power supply can be converted into a percentage system to facilitate subsequent conversion calculations.

[0092] Among them, the third conversion formula is:

[0093] U = S1′ / 20, (1.3);

[0094] U is the electrical signal amplitude of the first driving voltage signal S1, with the unit of V; S1′ is a percentage signal converted according to the third conversion formula.

[0095] Furthermore, the percentage signal S1′ is converted into a second driving voltage signal S2 according to the second conversion formula (1.2); the second driving voltage signal S2 is positively correlated with the diffraction efficiency of the AOM.

[0096] In combination with the above-listed embodiment of fitting using 5 line segments, it is further explained that the second conversion formula (1.2) provided according to the embodiment of the present invention converts the percentage signal S1' into the second driving voltage signal S2, and the second driving voltage signal S2 satisfies a positively correlated linear relationship with the diffraction efficiency η of the acousto-optic modulator.

[0097] The maximum diffraction efficiency of the acousto-optic modulator is obtained as η max The corresponding percentage signal is 100, and the diffraction efficiency of the AOM is selected to be 0.1η max , 0.5η max , 0.7η max , 0.9η max When the ratio of the diffraction efficiency of the AOM to the maximum diffraction efficiency is 0.1, the first percentage signal is A 1 The first percentage signal when the ratio of the diffraction efficiency of the AOM to the maximum diffraction efficiency is 0.5 is A 2 , the first percentage signal when the ratio of the diffraction efficiency of the light modulator to the maximum diffraction efficiency is 0.7 is A 3 The first percentage signal when the ratio of the diffraction efficiency of the AOM to the maximum diffraction efficiency is 0.9 is A 4 , where A max >A 4 >A 3 >A 2 >A 1 , according to the selected 0.1η max , 0.5η max , 0.7η max , 0.9η max , the five segment fitting intervals are: [0, 10), [10, 50), [50, 70), [70, 90), [90, 100), and then according to the second transformation formula:

[0098]

[0099] Substituting 100, A4, A3, A2, A1 and 0.1, 0.5, 0.7, 0.9, 1, the fitting formulas for the five line segment fitting intervals are:

[0100] When 0≤S1′<10, the first conversion formula is:

[0101] When 10≤S1′<50, the first conversion formula is:

[0102] When 50≤S1′<70, the first conversion formula is:

[0103] When 70≤S1′<90, the first conversion formula is:

[0104] When 90≤S1′<100, the first conversion formula is:

[0105]

[0106] At this time, when the first driving voltage signal input by the user through the control circuit is a numerical value S1, the signal amplitude U of the first driving voltage signal S1 is converted into a percentage signal S1' according to the third conversion formula (1.3). After judging the first driving voltage signal S1 and the preset 5 line segment fitting intervals, the control circuit selects one of the corresponding formulas (1.2.1), (1.2.2), (1.2.3), (1.2.4) or (1.2.5) according to the judgment result, converts the percentage signal S1' and outputs the second driving voltage signal S2 to the driving power supply of the acousto-optic modulator. The driving power supply drives the acousto-optic modulator to modulate the light intensity according to the input second driving voltage signal S2, so as to realize the linear output of the acousto-optic modulator with positive correlation to the diffraction efficiency.

[0107] In actual use, the default values ​​of A1, A2, A3, and A4 can be set to 10, 50, 70, and 90, respectively. According to the above formulas (1.2.1), (1.2.2), (1.2.3), (1.2.4), and (1.2.5), S1'=S2 at this time. When this conversion is not required, A1, A2, A3, and A4 can also be input into the control circuit as described above. Since the second conversion formula has been embedded in the program of the control circuit, it is only necessary to calibrate A1, A2, A3, and A4 once to achieve a linear relationship between the second driving voltage signal S2 and the diffraction efficiency η of the acousto-optic modulator.

[0108] Optionally, the second driving voltage signal and the diffraction efficiency of the acousto-optic modulator satisfy the following relationship:

[0109] η*=C*S2+B,(1.3);

[0110] Wherein, η* is the diffraction efficiency of the AOM, S2 is the second driving voltage signal, B and C are constants, and C>0.

[0111] The relationship between the electric signal amplitude of the first driving voltage signal S1 input to the control circuit and the diffraction efficiency η is converted into a positive correlation linear relationship to achieve the linear output of the acousto-optic modulator. In addition, the above formulas used in the present invention are all first-order linear formulas, which can reduce the working pressure of the system using a single-chip microcomputer as a control circuit processor.

[0112] Figure 5 A flow chart of another method for controlling an acousto-optic modulator provided by an embodiment of the present invention. Figure 5 As shown, optionally, another method for controlling an acousto-optic modulator provided by an embodiment of the present invention includes:

[0113] Step S301: establishing a corresponding relationship between the ratio of the diffraction efficiency of the AOM to the maximum diffraction efficiency and the driving voltage value.

[0114] Exemplarily, the control circuit receives the first driving voltage signal A1, and inputs the first driving voltage signal A1 into the driving power supply of the AOM. The driving power supply drives the AOM to work according to the first driving voltage signal A1, and the diffraction efficiency of the AOM at this time is obtained as η 1 ;

[0115] The control circuit receives the first driving voltage signal A2, and inputs the first driving voltage signal A2 into the driving power supply of the AOM. The driving power supply drives the AOM to work according to the first driving voltage signal A2, and the diffraction efficiency of the AOM is obtained as η. 2 ;

[0116] The control circuit receives the first driving voltage signal An-1, and inputs the first driving voltage signal An-1 into the driving power supply of the AOM. The driving power supply drives the AOM to work according to the first driving voltage signal An-1, and the diffraction efficiency of the AOM at this time is obtained as η n-1 ;

[0117] The control circuit receives the first driving voltage signal An, and inputs the first driving voltage signal An into the driving power supply of the AOM. The driving power supply drives the AOM to work according to the first driving voltage signal An, and obtains the diffraction efficiency of the AOM at this time as η n ;

[0118] According to multiple driving voltage input tests, the maximum diffraction efficiency of the acousto-optic modulator is obtained as η max , the corresponding driving voltage signal is A max , establish the diffraction efficiency η and the maximum diffraction efficiency η of the AOM max The corresponding relationship between the ratio X and the driving voltage value S1, for example: η1 / η max =X 1 .

[0119] We get (A1, X1), (A2, X2)...(A n-1 , X n-1 )、(A n , X n ) data relational database.

[0120] Step S302: receiving a first driving voltage signal.

[0121] Step S303: determining, according to the first driving voltage signal, a ratio of the diffraction efficiency of the AOM corresponding to the first driving voltage signal to the maximum diffraction efficiency.

[0122] Exemplarily, the ratio X of the diffraction efficiency η of the AOM corresponding to the first driving voltage signal S1 to the maximum diffraction efficiency is determined according to the first driving voltage signal S1, and (A n-1 , X n-1 )、(A n , X n ) is substituted into the first transformation formula (1.1).

[0123] Step S304: converting the first driving voltage signal into a second driving voltage signal according to the first conversion formula; the second driving voltage signal is positively correlated with the diffraction efficiency of the AOM.

[0124] Please continue to refer to the description of step S102.

[0125] The first conversion formula satisfies:

[0126]

[0127] Wherein, S1 is the first driving voltage signal, S2 is the second driving voltage signal, and the acousto-optic modulator includes a maximum diffraction efficiency; A n-1 The ratio of the diffraction efficiency of the AOM to the maximum diffraction efficiency is X n-1 The first driving voltage value when A n The ratio of the diffraction efficiency of the AOM to the maximum diffraction efficiency is X n The first driving voltage value when X n >X n-1 , A n >A n-1 , n>1, n is a positive integer.

[0128] Step S305: output a second driving voltage signal to the AOM.

[0129] On the basis of the above embodiment, optionally, after establishing the corresponding relationship between the ratio of the diffraction efficiency of the acousto-optic modulator to the maximum diffraction efficiency and the driving voltage value, the method further includes:

[0130] Update the corresponding relationship between the ratio of the diffraction efficiency to the maximum diffraction efficiency of the AOM and the driving voltage value.

[0131] Exemplarily, as the AOM is used more times and the device itself ages, the driving voltage value input by the control circuit and the corresponding diffraction efficiency of the AOM will change. Therefore, it is necessary to update the corresponding relationship between the ratio of the diffraction efficiency of the AOM to the maximum diffraction efficiency and the driving voltage value, so as to reset the first conversion formula and update the settings. Please refer to the steps of establishing the corresponding relationship between the ratio of the diffraction efficiency of the AOM to the maximum diffraction efficiency and the driving voltage value provided in the above embodiment.

[0132] Based on the same inventive concept, an embodiment of the present invention further provides a control device for an acousto-optic modulator, which can execute the control method for an acousto-optic modulator provided by an embodiment of the present invention. The control device for an acousto-optic modulator can be composed of software and / or hardware, and the control device for an acousto-optic modulator can be integrated into a microprocessor inside a control circuit. Figure 6 FIG. 1 is a block diagram of a control device for an acousto-optic modulator provided by an embodiment of the present invention. Figure 6 As shown, the control device 100 of the acousto-optic modulator provided in the embodiment of the present invention includes:

[0133] The signal receiving module 11 is used to receive a first driving voltage signal.

[0134] The signal conversion module 12 is used to convert the first driving voltage signal into a second driving voltage signal according to the first conversion formula; the second driving voltage signal is positively correlated with the diffraction efficiency of the acousto-optic modulator.

[0135] The first conversion formula satisfies:

[0136]

[0137] Wherein, S1 is the first driving voltage signal, S2 is the second driving voltage signal, and the acousto-optic modulator includes a maximum diffraction efficiency; A n-1 The ratio of the diffraction efficiency of the AOM to the maximum diffraction efficiency is X n-1 The first driving voltage value when A n The ratio of the diffraction efficiency of the AOM to the maximum diffraction efficiency is X n The first driving voltage value when X n >X n-1 , A n >A n-1 , n>1, n is a positive integer.

[0138] The signal output module 13 is used to output a second driving voltage signal to the AOM.

[0139] Combination Figure 2 As shown, the control device of the AOM used in the embodiment of the present invention can execute the control method of the AOM provided in the above embodiment, and converts the electric signal input to the AOM driving power supply by the control circuit by presetting the first conversion formula inside the control circuit, so that the relationship between the electric signal amplitude of the first driving voltage signal input by the control circuit and the diffraction efficiency is converted into a positive correlation linear relationship, so as to realize the linear output of the AOM, so that when the customer uses the AOM as an optical switch device, the diffraction efficiency of the AOM can be controlled more conveniently and accurately.

[0140] Optionally, the control device of the acousto-optic modulator further includes:

[0141] The percentage conversion module is used to convert the amplitude of the first driving voltage signal into a percentage signal.

[0142] The second formula conversion module is used to convert the percentage signal into a second driving voltage signal.

[0143] The second transformation formula satisfies:

[0144]

[0145] Among them, S1′ is a percentage signal.

[0146] Optionally, the control device of the acousto-optic modulator further includes:

[0147] The database establishment module is used to establish the corresponding relationship between the ratio of the diffraction efficiency of the acousto-optic modulator to the maximum diffraction efficiency and the driving voltage value.

[0148] The ratio determination module is used to determine the ratio of the diffraction efficiency of the acousto-optic modulator corresponding to the first driving voltage signal to the maximum diffraction efficiency according to the first driving voltage signal after receiving the first driving voltage signal and before converting the first driving voltage signal into the second driving voltage signal according to the first conversion formula.

[0149] Optionally, the control device of the acousto-optic modulator further includes:

[0150] The database updating module is used to update the corresponding relationship between the ratio of the diffraction efficiency of the acousto-optic modulator to the maximum diffraction efficiency and the driving voltage value.

[0151] The control device of the acousto-optic modulator provided in the embodiment of the present invention can execute the control method of the acousto-optic modulator provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of executing the control method of the acousto-optic modulator, which will not be described in detail here.

[0152] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and the features of the various embodiments of the present invention may be partially or completely coupled or combined with each other, and may cooperate with each other in various ways and be technically driven. It is possible for those skilled in the art to make various obvious changes, readjustments, combinations and substitutions without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A control method for an acousto-optic modulator, characterized in that: The method includes: Converting the amplitude of the first driving voltage signal into a percentage signal; The percentage signal is converted into a second driving voltage signal according to a second conversion formula; the second driving voltage signal is positively correlated with the diffraction efficiency of the acousto-optic modulator; The second conversion formula satisfies: Wherein, S1′ is the percentage signal, S2 is the second driving voltage signal, and the acousto-optic modulator includes a maximum diffraction efficiency; A n-1 The ratio of the diffraction efficiency of the AOM to the maximum diffraction efficiency is X n-1 The first driving voltage value when A n The ratio of the diffraction efficiency of the AOM to the maximum diffraction efficiency is X n The first driving voltage value when X n >X n-1 , A n >A n-1 , n>1, n is a positive integer; The second driving voltage signal is output to the AOM.

2. The control method according to claim 1, characterized in that: Before receiving the first driving voltage signal, the method further includes: Establish the corresponding relationship between the ratio of the diffraction efficiency of the acousto-optic modulator to the maximum diffraction efficiency and the driving voltage value; After receiving the first driving voltage signal and before converting the percentage signal into the second driving voltage signal according to the second conversion formula, the method further includes: The ratio of the diffraction efficiency of the AOM corresponding to the first driving voltage signal to the maximum diffraction efficiency is determined according to the first driving voltage signal.

3. The control method according to claim 2, characterized in that: After establishing the corresponding relationship between the ratio of the diffraction efficiency of the acousto-optic modulator to the maximum diffraction efficiency and the driving voltage value, it also includes: Update the corresponding relationship between the ratio of the diffraction efficiency to the maximum diffraction efficiency of the AOM and the driving voltage value.

4. A control device for an acousto-optic modulator, characterized in that: include: A percentage conversion module, used for converting the amplitude of the first driving voltage signal into a percentage signal; A second formula conversion module, used for converting the percentage signal into a second driving voltage signal according to a second conversion formula; the second driving voltage signal is positively correlated with the diffraction efficiency of the acousto-optic modulator; The second conversion formula satisfies: Wherein, S1′ is the percentage signal, S2 is the second driving voltage signal, and the acousto-optic modulator includes a maximum diffraction efficiency; A n-1 The ratio of the diffraction efficiency of the AOM to the maximum diffraction efficiency is X n-1 The first driving voltage value when A n The ratio of the diffraction efficiency of the AOM to the maximum diffraction efficiency is X n The first driving voltage value when X n >X n-1 , A n >A n-1 , n>1, n is a positive integer; A signal output module is used to output the second driving voltage signal to the acousto-optic modulator.

5. The control device according to claim 4, characterized in that: Also includes: A database establishment module, used to establish a corresponding relationship between the ratio of the diffraction efficiency of the acousto-optic modulator to the maximum diffraction efficiency and the driving voltage value; A ratio determination module is used to determine the ratio of the diffraction efficiency of the acousto-optic modulator corresponding to the first driving voltage signal to the maximum diffraction efficiency according to the first driving voltage signal after receiving the first driving voltage signal and before converting the percentage signal into a second driving voltage signal.

6. The control device according to claim 5, characterized in that: Also includes: The database updating module is used to update the corresponding relationship between the ratio of the diffraction efficiency of the acousto-optic modulator to the maximum diffraction efficiency and the driving voltage value.

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