Wavelength following system based on adjustable optical filter

Abstract

The invention discloses a wavelength following system based on an adjustable optical filter, and the system comprises a laser wavelength monitoring module which is used for monitoring the first central wavelength of laser output by a laser and the change of the first central wavelength in real time; and the filter wavelength following module is used for controlling a filtering window of the adjustable filter, so that a second central wavelength of the filtering window synchronously follows the first central wavelength, and a spectrogram of the laser moving along with the change of the working temperature is observed through a spectrograph connected with the adjustable filter. The problem that the central wavelength of the laser output by the laser drifts along with the change of the working temperature can be solved, the purpose of self-calibration of the system is achieved, and meanwhile the test precision of the system is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of laser wavelength and wavelength following, and in particular relates to a wavelength following system based on an adjustable optical filter. Background Art

[0002] The advent of the intelligent era is accompanied by the rapid development of optoelectronic technology, and the research and development technology of semiconductor lasers is particularly remarkable. These lasers have shown extensive application potential in many fields with their unique advantages such as a wide adjustable wavelength range, compact size, light weight, long service life, high portability and ease of use. Specifically, semiconductor lasers are used in key technologies such as laser radar, laser guidance systems and laser ranging in the military field; at the industrial technology level, they support laser printers, optical information processing technology and spectral analysis; and in the medical field, they play an indispensable role in laser surgery, laser dynamic therapy and life science research. In addition, fiber optic sensing technology has also shown its irreplaceable importance in bridge fault detection and oil and gas pipeline monitoring.

[0003] Although semiconductor lasers have shown great potential in many fields, the stability of their performance remains a key issue that needs to be addressed. As an efficient electron-to-photon conversion device, semiconductor lasers have very high quantum efficiency, but they are also extremely sensitive to operating temperature. Even small temperature fluctuations are enough to cause significant changes in the output light power and wavelength, which directly affect the output characteristics of the laser. Therefore, achieving precise control of the output characteristics has become a major challenge to maximize the advantages of semiconductor lasers. Summary of the invention

[0004] In order to solve the above technical problems, the present invention proposes a wavelength following system based on a tunable optical filter to solve the above problems existing in the prior art.

[0005] To achieve the above objectives, in a first aspect, the present invention provides a wavelength following system based on a tunable optical filter, comprising:

[0006] A laser wavelength monitoring module, used for real-time monitoring of the first central wavelength of the laser output and its changes;

[0007] The filter wavelength following module is used to control the filter window of the tunable filter so that the second center wavelength of the filter window synchronously follows the first center wavelength, and observe the spectrum of the laser moving with the change of working temperature through a spectrometer connected to the tunable filter.

[0008] Preferably, the laser wavelength monitoring module includes a first laser, a second laser, a temperature-sensitive resistor monitoring module, an ADC module, and a single-chip microcomputer;

[0009] Wherein, both ends of the thermistor of the first laser are connected to the thermistor monitoring module, the output end of the thermistor monitoring module is connected to the input end of the ADC module, and the output end of the ADC module is connected to the single chip microcomputer;

[0010] Two ends of the temperature-sensitive resistor of the second laser are connected to the first laser.

[0011] Preferably, the filter wavelength following module includes a power module, a DAC module, a tunable optical filter, and a spectrometer;

[0012] Wherein, the single chip microcomputer is connected to the input end of the DAC module, the output end of the DAC module is connected to the input end of the power module, and the output end of the power module is connected to the electrical input end of the tunable optical filter;

[0013] The output end of the first laser is connected to the optical input end of the tunable optical filter, and the optical output end of the tunable optical filter is connected to the input end of the spectrometer.

[0014] In a second aspect, the present invention further provides a method for using a wavelength following system based on a tunable optical filter, the method comprising the following steps:

[0015] The laser's thermistor resistance value is output through the single chip microcomputer of the laser wavelength monitoring module;

[0016] The second laser provides the missing temperature-sensitive resistor of the first laser, and the driving stage drives the first laser to output laser light; based on the resistance value of the temperature-sensitive resistor, the single-chip microcomputer calculates the first center wavelength value of the laser light output by the first laser;

[0017] By means of the filter wavelength following module, the second central wavelength value is matched with the first central wavelength value one by one;

[0018] The voltage information provided by the DAC module to the power module is calculated by the single chip microcomputer, and the filtering window of the adjustable filter is controlled by the voltage information to achieve that the second central wavelength value changes with the first central wavelength value;

[0019] The spectrum of the laser light output by the first laser is observed by a spectrometer.

[0020] Preferably, by adjusting the operating temperature of the first laser, the spectrum of the spectrometer is shifted left and right as the operating temperature changes.

[0021] Preferably, the method further comprises: adjusting the input voltage value of the tunable optical filter, observing the second central wavelength value through a spectrometer, and establishing a curve of the input voltage of the tunable optical filter and the second central wavelength value.

[0022] In a third aspect, the present invention further discloses a computer device, comprising a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the method described in the second aspect.

[0023] In a fourth aspect, the present invention further discloses a computer-readable storage medium having a computer program stored thereon, which implements the steps of the method described in the second aspect when executed by a processor.

[0024] In a fifth aspect, the present invention further discloses a computer program product, including a computer program, which implements the steps of the method described in the second aspect when executed by a processor.

[0025] Compared with the prior art, the present invention has the following advantages and technical effects:

[0026] The present invention provides a wavelength following system based on an adjustable optical filter, comprising: a laser wavelength monitoring module, used for real-time monitoring of the first central wavelength and its change of the laser output by the laser; a filter wavelength following module, used for controlling the filter window of the adjustable filter, so that the second central wavelength of the filter window synchronously follows the first central wavelength, and observing the spectrum diagram of the laser moving with the change of the working temperature through a spectrometer connected to the adjustable filter.

[0027] The present invention can solve the problem that the central wavelength of the laser output drifts with the change of the working temperature, achieves the purpose of system self-calibration, and improves the test accuracy of the system. In addition, the present invention does not need to destroy the structure of the laser itself, and can realize adaptive wavelength tracking through a single chip microcomputer with an accuracy of up to 10 -5 nm order of magnitude. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0029] Figure 1 is a schematic diagram of a device according to an embodiment of the present invention;

[0030] Among them, 1. the first laser; 2. the second laser; 3. the temperature-sensitive resistor monitoring module; 4. the ADC module; 5. the single-chip microcomputer; 6. the tunable optical filter; 7. the power module; 8. the DAC module; 9. the spectrometer. DETAILED DESCRIPTION

[0031] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0032] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0033] Embodiment 1

[0034] like Figure 1 As shown, this embodiment provides a wavelength following system based on a tunable optical filter, including:

[0035] Laser wavelength monitoring module, used to monitor the central wavelength of the laser output and its changes in real time;

[0036] The laser wavelength monitoring module includes a first laser 1, a second laser 2, a temperature-sensitive resistor monitoring module 3, an ADC module 4, and a single-chip microcomputer 5;

[0037] Specifically, both ends of the thermistor of the first laser 1 are connected to the thermistor monitoring module 3; the thermistor monitoring module 3 is connected to the ADC module 4; the output end of the ADC module 4 is connected to the single-chip microcomputer 5; the resistance value of the thermistor of the first laser 1 is obtained through the single-chip microcomputer 5;

[0038] The two ends of the thermistor of the second laser 2 are connected to the first laser 1, and placed on the laser driving platform to drive the first laser 1 to output laser; through the program design of the single-chip microcomputer 5, based on the resistance value of the thermistor of the first laser 1, the central wavelength value of the laser output by the first laser 1 is calculated.

[0039] The filter wavelength following module is used to control the filter window of the tunable filter to follow the fluctuation of the laser output by the laser with high precision and synchronization.

[0040] Wherein, the filter wavelength following module includes an adjustable optical filter 6, a power module 7, a DAC module 8, and a spectrometer 9;

[0041] Specifically, the single chip computer 5 is connected to the input end of the DAC module 8; the output end of the DAC module 8 is connected to the input end of the power module 7; the output end of the power module 7 is connected to the electrical input end of the tunable optical filter 6; the optical input end of the tunable optical filter 6 is connected to the laser output end of the first laser 1; and the optical output end of the tunable optical filter 6 is connected to the input end of the spectrometer 9.

[0042] In this embodiment, the central wavelength of the filter window of the tunable filter 6 is made to correspond to the wavelength of the laser output by the first laser 1. Through the program design in the single-chip computer 5, the voltage information that the DAC module 8 needs to provide to the power module 7 is calculated, and then the filter window of the tunable filter 6 is controlled to change with the output laser of the first laser 1. The experimental results are observed and verified by the spectrometer 9.

[0043] Embodiment 2

[0044] Based on the same inventive concept, this embodiment also provides a method for using a wavelength following system based on a tunable optical filter, the method comprising the following steps:

[0045] The laser's thermistor resistance value is output through the single chip microcomputer of the laser wavelength monitoring module;

[0046] The second laser provides the missing temperature-sensitive resistor of the first laser, and the driving stage drives the first laser to output laser light; based on the resistance value of the temperature-sensitive resistor, the single-chip microcomputer calculates the first center wavelength value of the laser light output by the first laser;

[0047] By means of the filter wavelength following module, the second central wavelength value is matched with the first central wavelength value one by one;

[0048] The voltage information provided by the DAC module to the power module is calculated by the single chip microcomputer, and the filtering window of the adjustable filter is controlled by the voltage information to achieve that the second central wavelength value changes with the first central wavelength value;

[0049] The spectrum of the laser light output by the first laser is observed by a spectrometer.

[0050] In this embodiment, the method of use specifically includes:

[0051] Step 1: Isolate the temperature-sensitive resistor of the first laser 1;

[0052] Step 2: Connect the two ends of the temperature-sensitive resistor of the first laser 1 and the second laser 2;

[0053] Step 3: Place the first laser 1 on the laser drive platform and set the laser output center wavelength to λ L ;

[0054] Step 4: Connect the first laser 1 thermistor to the thermistor monitoring module 3 to obtain the resistance value R of the first laser 1 thermistor t ;

[0055] Step 5: Connect the output end of the temperature-sensitive resistor monitoring module 3 to the input end of the ADC module 4;

[0056] Step 6: Connect the output end of the ADC module 4 to the microcontroller 5;

[0057] Step 7: Transmit the resistance data of the temperature-sensitive resistor of the first laser 1 to the single-chip microcomputer 5 through the ADC module 4;

[0058] Step 8: Use a multimeter to connect the two sides of the thermistor of the first laser 1, adjust the temperature, measure the resistance of the thermistor, and establish a curve of the resistance and temperature of the thermistor of the first laser 1;

[0059] Step nine: the single chip microcomputer 5 controls the software algorithm, and obtains the current working temperature of the first laser 1 according to the above-mentioned curve of the resistance value and temperature of the thermistor of the first laser 1, which is recorded as T;

[0060] Step nine: Connect the light output end of the first laser 1 to the input end of the spectrometer 9;

[0061] Step 10: adjusting the working temperature of the first laser 1, the spectrometer 9 observes the central wavelength of the laser output by the first laser 1, and establishing a curve of the working temperature and the output laser wavelength of the first laser 1;

[0062] Step 11: The single chip microcomputer 5 controls the software algorithm, and obtains the central wavelength value of the current output laser of the first laser 1 according to the curve of the working temperature and output laser wavelength of the first laser 1 in step 10, which is recorded as λ L’ ;

[0063] Step 12: Assume that the center wavelength of the filter window of the tunable optical filter 6 is λ F , let λ F The value is equal to the central wavelength of the first laser 1, that is, λ F =λ L’ ;

[0064] Step 13: Connect the light output end of the tunable optical filter 6 to the input end of the spectrometer 9;

[0065] Step 14: providing a light source for the tunable optical filter 6, adjusting the input voltage value of the tunable optical filter 6, the spectrometer 9 observing the central wavelength of the filter window of the tunable optical filter 6, and establishing a curve of the input voltage of the tunable optical filter 6 and the central wavelength of the filter window;

[0066] Step 15: The single chip microcomputer 5 controls the software algorithm, and obtains the voltage value U that needs to be provided to the filter according to the curve of the output voltage of the tunable optical filter 6 and the center wavelength of the filter window in step 14;

[0067] Step 16: Connect the multimeter to the output terminal of the power module 7, adjust the input voltage value of the power module 7, and establish a curve of the input and output voltages of the power module 7;

[0068] Step 17: The single chip microcomputer 5 controls the software algorithm to obtain the input signal U' required to be provided to the power module 7 according to the curve of the input and output voltage of the power module 7 in step 16;

[0069] Step 18: Connect the single chip microcomputer 5 to the input terminal of the DAC module 8;

[0070] Step 19: Connect the output end of the DAC module 8 to the input end of the power module 7;

[0071] Step 20: Connect the output end of the power module 7 to the voltage input end of the tunable optical filter 6;

[0072] Step 21: Connect the optical output end of the first laser 1 to the optical input end of the tunable optical filter 6;

[0073] Step 22: According to step 8 to step 17, the single chip microcomputer 5 controls the software algorithm to enable the power module 7 to provide input voltage to the tunable optical filter 6;

[0074] Step 23: Connect the light output end of the tunable optical filter 6 to the input end of the spectrometer 9;

[0075] Step 24: Observe the spectrum of the laser output from the first laser 1 passing through the tunable optical filter 6 through the spectrometer 9;

[0076] Step 25: Adjust the working temperature of the first laser 1, heat or cool it, and it can be observed that the spectrum on the spectrometer 9 shifts left and right with the change of temperature, and the optical power value does not jump sharply.

[0077] The method for using the wavelength following system based on the tunable optical filter provided in this embodiment has all the advantages of the wavelength following system based on the tunable optical filter provided in the first embodiment.

[0078] Embodiment 3

[0079] This embodiment further discloses a computer device, including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the method described in the second embodiment.

[0080] Embodiment 4

[0081] This embodiment further discloses a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the method described in the second embodiment are implemented.

[0082] Embodiment 5

[0083] This embodiment also discloses a computer program product, including a computer program, which implements the steps of the method described in the second embodiment when executed by a processor.

[0084] The above are only preferred specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A wavelength following system based on a tunable optical filter, characterized in that: include: A laser wavelength monitoring module, used for real-time monitoring of the first central wavelength of the laser output and its changes; A filter wavelength following module, used for controlling a filter window of an adjustable filter so that a second center wavelength of the filter window synchronously follows the first center wavelength, and observing a spectrum graph of the laser moving with a change in operating temperature through a spectrometer connected to the adjustable filter; Wherein, the laser wavelength monitoring module is connected to the filter wavelength following module.

2. The system according to claim 1, characterized in that The laser wavelength monitoring module includes a first laser, a second laser, a temperature-sensitive resistor monitoring module, an ADC module, and a single-chip microcomputer; Wherein, both ends of the thermistor of the first laser are connected to the thermistor monitoring module, the output end of the thermistor monitoring module is connected to the input end of the ADC module, and the output end of the ADC module is connected to the single chip microcomputer; Two ends of the temperature-sensitive resistor of the second laser are connected to the first laser.

3. The system according to claim 2, characterized in that The filter wavelength following module includes a power module, a DAC module, an adjustable optical filter, and a spectrometer; Wherein, the single chip microcomputer is connected to the input end of the DAC module, the output end of the DAC module is connected to the input end of the power module, and the output end of the power module is connected to the electrical input end of the tunable optical filter; The output end of the first laser is connected to the optical input end of the tunable optical filter, and the optical output end of the tunable optical filter is connected to the input end of the spectrometer.

4. A method for using a wavelength following system based on a tunable optical filter, characterized in that: Based on the wavelength following system based on the tunable optical filter according to any one of claims 1 to 3, the method of use comprises the following steps: The laser's thermistor resistance value is output through the single chip microcomputer of the laser wavelength monitoring module; The second laser provides the missing temperature-sensitive resistor of the first laser, and the driving stage drives the first laser to output laser light; based on the resistance value of the temperature-sensitive resistor, the single-chip microcomputer calculates the first center wavelength value of the laser light output by the first laser; By means of the filter wavelength following module, the second central wavelength value is matched with the first central wavelength value one by one; The voltage information provided by the DAC module to the power module is calculated by the single chip microcomputer, and the filtering window of the adjustable filter is controlled by the voltage information to achieve that the second central wavelength value changes with the first central wavelength value; The spectrum of the laser light output by the first laser is observed by a spectrometer.

5. The method according to claim 4, characterized in that By adjusting the operating temperature of the first laser, the spectrum of the spectrometer is shifted left and right as the operating temperature changes.

6. The method according to claim 4, characterized in that Also includes: The input voltage value of the tunable optical filter is adjusted, the second central wavelength value is observed by a spectrometer, and a curve of the input voltage of the tunable optical filter and the second central wavelength value is established.

7. A computer device comprising a memory, a processor and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps of the method according to any one of claims 4 to 6.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 4 to 6 are implemented.

9. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 4 to 6 are implemented.

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