WO2020074000A1

WO2020074000A1 - Laser array element, array, and device for realizing received light intensity self-stabilization on the basis of array

Info

Publication number: WO2020074000A1
Application number: PCT/CN2019/110759
Authority: WO
Inventors: 陶俊; 向少卿
Original assignee: 上海禾赛光电科技有限公司
Priority date: 2018-10-12
Filing date: 2019-10-12
Publication date: 2020-04-16

Abstract

A laser array element, an array, and a device for realizing received light intensity self-stabilization on the basis of the array. The array element comprises a laser; a light-splitting component, provided on an emergent light path of the laser and splitting laser light emitted by the laser into detection light and reference light; a gas absorption pool, provided on an optical path where the reference light is located; a detector, configured to receive the reference light passing through the gas absorption pool; a controller, connected to the detector; and a driving module, configured to drive the laser according to a driving signal output by the controller. The controller comprises a digital sampling module (1), an absorption peak analysis module (2), an offset calculation module (3), and a driving signal output module (4).

Description

Laser array element, array and device for realizing self-stabilization of received light intensity based on array

Technical field

The invention relates to the technical field of laser telemetry, in particular to a laser array element, an array, and a device for achieving self-stabilization of received light intensity based on the array.

Background technique

TDLAS is the abbreviation of Tunable Diode Laser Absorption Spectroscopy. This technology mainly uses the narrow line width and wavelength of tunable semiconductor lasers to change with the injection current to achieve the measurement of single or several absorption lines that are very close to the molecule . At present, in the application of TDLAS, a stronger emission laser is often required to achieve the requirements of higher performance indicators. For example, in a long-distance gas telemetry device, a higher emission power can realize detection at a longer distance. There are currently two main ways to increase the laser emission power:

(1) Choose a laser with higher emission optical power: the optical power of the near-infrared DM laser or DFB laser for TDLAS currently available on the market does not exceed 20mW, and the narrow linewidth that cannot provide higher output optical power can Tuning the laser.

(2) Inject appropriate driving current into the laser to maximize the laser power. However, even if the drive current of the laser is adjusted to maximize the drive optical power of the laser, it is still impossible to achieve an output of more than 20mW or higher optical power, and the degree of power increase is limited.

In addition, in the actual application of TDLAS, because the laser light intensity received by the detector is affected by many factors such as the reflectivity of the reflecting surface, the laser propagation distance, the angle between the laser and the reflecting surface, etc., it will cause the detector to receive The laser light intensity varies greatly. In the prior art, two technical solutions are mainly used to solve the technical problem of unstable laser light intensity received by the detector:

(1) A diaphragm is used to adjust the aperture of the detector's optical receiver to avoid signal distortion caused by excessively high laser light intensity. However, when the aperture becomes larger, the light intensity of external stray light will also be increased, affecting the performance of the detector. And because the diaphragm is driven by the motor to adjust its clear aperture, it is impossible to achieve rapid adjustment and mechanical wear leads to a short life of the diaphragm.

(2) Adjust the exposure time of the detector to avoid low signal-to-noise of the signal caused by the light intensity received by the detector being too small. However, adjusting the exposure time of the detector will affect the response speed of the measuring device. For example, extending the exposure time will cause the response speed to become slower. And if the saturation of the detector is generated due to the received laser light intensity being too large, even if the exposure time of the detector is adjusted, the problem of signal distortion cannot be solved.

Summary of the invention

In order to solve the technical problems in the prior art that it is difficult to provide a high optical power output and the laser light intensity received by the detector is easily unstable, the present invention provides a laser array element, an array, and a device for self-stabilizing received light intensity based on the array.

The present invention is realized by the following technical solution:

First, the present invention provides a laser array element. The laser array element includes a laser, and the laser array element further includes:

A beam splitting component, which is provided in the exit optical path of the laser, and splits the laser beam emitted by the laser into detection light and reference light;

The gas absorption cell is set on the optical path where the reference light is located;

A detector for receiving reference light passing through the gas absorption cell;

A controller connected to the detector;

A driving module, configured to drive the laser according to the driving signal output by the controller;

The controller includes:

Digital sampling module, used to sample the received electrical signals to obtain digital signals;

An absorption peak analysis module, configured to obtain an absorption peak corresponding to the reference light according to the digital signal;

An offset calculation module, configured to compare the absorption peak corresponding to the reference light with a preset absorption peak to obtain an absorption peak offset;

A driving signal output module, configured to generate a driving signal according to the absorption peak offset, and transmit the driving signal to the driving module

Based on the laser array element, the present invention further provides a laser array, and the laser array may include a plurality of the above laser array elements.

Based on the laser array, the present invention further provides a device for achieving self-stabilization of received light intensity based on the laser array, the device includes at least one of the above laser arrays, and the beam propagation direction of each laser array element in the laser array is the same, Also includes:

An array beam detector, the array beam detector is used for receiving the array beam emitted by the laser array, and transmitting the amplitude of the received optical signal to the general controller;

The general controller is used to obtain the difference between the received optical signal amplitude and the standard value of the optical signal amplitude, and control the opening and closing of each laser array element in the laser array according to the difference .

Further, the present invention also provides a laser control method, which is executed by the above laser array element and includes:

Obtain the digital signal of the reference light passing through the gas absorption cell;

Acquiring the absorption peak corresponding to the reference light according to the digital signal;

Comparing the absorption peak corresponding to the reference light with a preset absorption peak to obtain an absorption peak offset;

Generating a driving signal according to the absorption peak offset;

Drive the laser according to the drive signal.

Further, the present invention also provides a method for realizing self-stabilization of received light intensity based on a laser array, and the method is implemented by the above-mentioned device for self-stabilization of received light intensity based on a laser array, including:

The main controller controls the laser array to emit the array beam;

The array beam detector receives the array beam emitted by the laser array, and transmits the amplitude of the received optical signal to the general controller;

The general controller obtains the difference between the received optical signal amplitude and the standard value of the optical signal amplitude, and controls the opening and closing of each laser array element in the laser array according to the difference.

The beneficial effects of the present invention are:

(1) The present invention provides a laser array element, an array based on the laser array element, and a laser array element control method. By designing a structure for feedback control of the laser element in the laser array element, current control and temperature control can be achieved The angle of the laser controls the wavelength of the laser light emitted by the laser. On the premise that the laser wavelength of each laser array element can be accurately controlled, a laser array is obtained, and high-power laser can be obtained by increasing the number of laser array elements in the laser array.

(2) The invention also provides a device for realizing self-stabilization of received light intensity based on a laser array and a method for self-stabilization of received light intensity based on a laser array. The overall controller analyzes the amplitude and light of the optical signal received by the array beam detector The gap of the standard value of the signal amplitude to control the number of laser array elements in the laser array to turn on, and finally achieve the adjustment of the total output optical power. The laser array is adjusted based on the gap between the optical signal amplitude and the standard value of the optical signal amplitude, thereby A closed control loop is generated. Compared with the existing technology that needs to rely on mechanical moving parts, it has the advantages of fast response and long life. In the process of self-stabilization of the received light intensity, it will not change the performance of the optical receiving system or increase the external stray light, thereby ensuring The optical signal received by the array beam detector has a high signal-to-noise ratio.

BRIEF DESCRIPTION

1 (1) is a schematic diagram of a first laser array provided by the present invention;

1 (2) is a schematic diagram of a second laser array provided by the present invention;

2 (1) is a schematic diagram of a first laser array element provided by an embodiment of the present invention;

2 (2) is a schematic diagram of a second laser array element provided by an embodiment of the present invention;

3 is a block diagram of a controller provided by an embodiment of the present invention;

4 (1) is a schematic diagram of an optical signal after passing through a gas absorption cell provided by an embodiment of the present invention;

4 (2) is a schematic diagram of an optical signal provided by an embodiment of the present invention without gas absorption;

5 is a block diagram of a current driver provided by an embodiment of the present invention;

6 is a block diagram of a temperature controller provided by an embodiment of the present invention;

7 is a flowchart of a control method provided by an embodiment of the present invention;

8 is a schematic diagram of an apparatus for realizing self-stabilization of received light intensity based on a laser array provided by an embodiment of the present invention;

9 is a flowchart of a method for achieving self-stabilization of received light intensity based on a laser array provided by an embodiment of the present invention.

detailed description

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings.

The use of laser arrays can break through the limitations of the device's limit parameters. By increasing the number of lasers, the required high-power laser can be obtained, as shown in Figure 1 (1). However, due to the technical requirements of TDLAS, the laser array in Figure 1 (1) The wavelength of each laser must be kept strictly consistent. In the embodiment of the present invention, each laser is independently and accurately controlled to achieve the goal of uniform wavelength of all lasers. Figure 1 (1) is a schematic diagram of multiple lasers directly combined to achieve high-power laser. In addition, in the embodiment of the present invention, as shown in FIG. 1 (2), the light emitted by each laser may also be combined by an optical fiber combiner to obtain a high-power laser.

Specifically, in order to accurately control each laser, an embodiment of the present invention provides a laser array element based on each laser. The laser array element includes a laser, and the laser array element further includes:

A controller connected to the detector;

The driving module is configured to drive the laser according to the driving signal output by the controller.

Specifically, please refer to FIG. 2 (1), the beam splitter may be a beam splitter, please refer to FIG. 2 (2), the beam splitter may also be an optical fiber. When an optical fiber is used as the beam splitting part, the Y-type optical fiber splits the laser light into detection light and reference light. The detection light is emitted through the exit fiber, and the reference light enters the gas absorption cell through the reference fiber and the fiber collimator.

The controller as shown in FIG. 3 includes:

The digital sampling module 1 is used to sample the received electrical signal to obtain a digital signal.

The absorption peak analysis module 2 is configured to obtain the absorption peak corresponding to the reference light according to the digital signal.

The offset calculation module 3 is configured to compare the absorption peak corresponding to the reference light with a preset absorption peak to obtain an absorption peak offset.

The driving signal output module 4 is configured to generate a driving signal according to the absorption peak offset and transmit the driving signal to the driving module.

In the embodiment of the present invention, the laser light emitted by the laser is divided into two laser beams by the beam splitting component: the outgoing light and the reference light. The beam splitting component often needs to be coated with an antireflection coating, so that the intensity of the outgoing light is hundreds to thousands of times that of the reference light. The reference light is used to monitor the wavelength of the outgoing light. After the reference light passes through the gas absorption cell, light of a specific wavelength is selectively absorbed by the gas, and the reference light carrying the gas absorption information is received by the detector.

The detector converts the light intensity signal into an electrical signal and transmits it to the controller. The controller can collect the electrical signal into a data signal after receiving the external trigger signal, and then analyze the digital signal to determine the position of the absorption peak and the absorption peak deviation. Shift amount, and then get the drive signal, so as to realize the feedback control of the laser light emitted from the laser.

Specifically, the angle between the normal of the optical window of the gas absorption cell and the optical axis of the laser is 5 ° -45 °; the angle between the normal of the photosensitive surface of the detector and the optical axis of the laser is 5 ° -45 °.

Fig. 4 (1) shows the optical signal after passing through the gas absorption cell, and Fig. 4 (2) shows the optical signal without gas absorption. The light signal after gas absorption is directly detected by the detector. The light signal without gas absorption can be obtained by direct detection or data fitting. By comparing the light signal without gas absorption and the light signal with gas absorption, gas absorption can be obtained. Peak signal to obtain the position of the absorption peak.

In a feasible embodiment, the light signal after the gas absorption can also be derivated to exclude the laser light intensity information in the light intensity signal to obtain the harmonic signal of the gas absorption peak signal, through a peak search or zero point algorithm , The position of the gas absorption peak can be obtained directly. If the harmonic method is used to measure the gas concentration, the optical signal after gas absorption is phase-locked and amplified to obtain the harmonic signal of the gas absorption signal, and the position of the gas absorption peak is directly obtained through a peak-finding or zero-point algorithm.

The controller in the embodiment of the present invention makes the position of the absorption peak closer to the preset position based on the feedback control principle until the absorption peak shift amount is small enough to meet the requirements for precise control of the laser wavelength. Correspondingly, in a laser array composed of laser array elements, each laser array element uses the above process to adjust the position of the reference light absorption peak emitted by the laser to a preset position, so as to achieve the consistency of the reference light wavelength of all lasers, The consistent wavelength of the light beam achieves the purpose of using the laser array to increase the laser emission power.

In a feasible implementation manner, the controller may perform feedback control by converting the absorption peak offset into a laser drive current DC offset.

Specifically, the driving module includes a current driver, and the current driver is used to input a laser driving current to the laser.

The driving signal output module includes:

A first driving signal output unit, configured to calculate a DC offset according to the absorption peak offset, and output the DC offset to the current driver;

The current driver is shown in FIG. 5 and includes:

The external input unit 10 is used to obtain an external driving signal.

The offset signal input unit 20 is used to obtain a DC offset.

The driving current output unit 30 is configured to obtain a laser driving current according to the external driving signal and the DC offset, and output the laser driving current to the laser.

In the above embodiment, the current driver adds the DC bias to the external drive signal, and then converts the added signal into the drive current of the laser. In this way, the external drive current can scan the laser wavelength in a certain wavelength range, and the DC offset can adjust the position of the wavelength scan, so that the position of the absorption peak can be adjusted by the DC offset to ensure the wavelength of the laser light emitted by the laser. stable.

In another feasible implementation manner, the controller may perform feedback control by converting the absorption peak offset into a laser temperature set value.

The driving module includes a temperature controller, and the temperature controller is used to input a temperature control current to the laser.

The driving signal output module includes:

The second driving signal output unit is configured to calculate a temperature setting value according to the absorption peak offset and output the temperature setting value to the temperature controller.

The temperature controller is shown in FIG. 6 and includes:

The temperature setting unit 100 is used to obtain the temperature setting value output by the second driving signal output unit;

The temperature control current output unit 200 is configured to output a temperature control current to the laser according to the temperature setting value and the temperature of the laser.

In order to improve the accuracy of the temperature control of the laser, in one embodiment, the laser further includes a temperature sensor for acquiring the temperature of the laser;

The temperature controller also includes a feedback temperature acquisition unit 300, the feedback temperature acquisition unit is connected to the temperature sensor.

The temperature controller also includes:

The comparator 400 is used to obtain the difference between the temperature setting value and the temperature of the laser;

The temperature control current output unit 200 is further used to output a temperature control current to the laser according to the difference. Specifically, the control method based on the difference may be PID (a feedback loop) or other control methods.

Specifically, the laser further includes a TEC (semiconductor refrigerator), which is made using the Peltier effect of semiconductor materials. When an electric current flows from the TEC, the heat generated by the current will be transferred from one side of the TEC to the other side, and a "hot" side and a "cold" side are generated on the TEC. This is the principle of TEC heating and cooling.

The temperature control current output unit may be a TEC temperature control driver, and the TEC temperature control driver outputs a TEC drive current to the laser.

In the above embodiment, the temperature controller may feed back the current temperature of the laser through a temperature sensor, and control the temperature of the laser by changing the TEC drive current. In this way, the wavelength of the laser can be changed by changing the temperature of the laser. Similarly, the position of the absorption peak can be adjusted to ensure the stability of the wavelength of the laser light emitted by the laser.

In another feasible implementation manner, the controller may adaptively select and use different feedback control methods according to the actual situation.

Specifically, the driving module includes:

A current driver, the current driver is used to input a laser driving current to the laser;

A temperature controller, the temperature controller is used to input a temperature control current to the laser;

The driving signal output module includes:

A second driving signal output unit, configured to calculate a temperature setting value according to the absorption peak offset, and output the temperature setting value to the temperature controller;

The comparing unit is configured to judge and activate the first driving signal output unit and / or the second driving signal output unit according to the absorption peak offset.

In the embodiment, the controller may use different feedback control paths according to different adaptive selections of the absorption peak offset. In a feasible embodiment, when the offset is small, the position of the absorption peak is adjusted by increasing / decreasing the DC offset component of the driving current; when the offset is large, the temperature of the laser is adjusted The position of the absorption peak. The size of the offset can be determined by setting a threshold.

Further, for the laser array in the embodiment of the present invention, each laser is strictly controlled by one laser array element, and one laser array element constitutes an independent function module of the laser array, and the modular design can maximize Reduce the coupling of the laser array. Further, each laser array element can independently and accurately modulate the wavelength of the lasers by changing the temperature and / or changing the driving current, and can all meet the requirements of narrow line width, thereby ensuring that each laser in the laser array emits The laser performance is good, and the wavelength is strictly consistent, thus ensuring the performance of the laser array. Of course, the laser array can obtain any high-power laser by increasing the number of laser array elements.

Another embodiment of the present invention provides a laser array element control method, which can be executed by the laser array element described above, as shown in FIG. 7, including:

S1. Obtain the digital signal of the reference light passing through the gas absorption cell.

S2. Acquire the absorption peak corresponding to the reference light according to the digital signal.

S3. Compare the absorption peak corresponding to the reference light with a preset absorption peak to obtain an absorption peak offset.

S4. Generate a driving signal according to the absorption peak offset.

Specifically, the generating the driving signal according to the absorption peak offset may include:

S41. Obtain a driving signal generation strategy; the driving signal generation strategy includes generating a first driving signal and / or generating a second driving signal. In a feasible implementation manner, the driving signal generation strategy may be selected according to the magnitude of the absorption peak offset, and the driving signal generation strategy may be that only the first driving signal, only the second driving signal, or both The first driving signal and the second driving signal.

S42. Generate a drive signal according to the drive signal generation strategy and the absorption peak offset.

If the driving signal generation strategy is to generate the first driving signal, the generating the driving signal according to the driving signal generation strategy and the absorption peak offset includes:

Calculating the DC offset according to the absorption peak offset;

The driving the laser according to the driving signal output by the controller includes:

Obtain external drive signals;

Obtain the DC offset;

The laser drive current is obtained according to the external drive signal and the DC offset, and the laser drive current is output to the laser.

If the driving signal generation strategy is to generate the second driving signal, the generating the driving signal according to the driving signal generation strategy and the absorption peak offset includes:

Calculate the temperature setting value according to the absorption peak offset;

Obtain the temperature setting value;

According to the temperature setting value and the temperature of the laser, a temperature control current is output to the laser.

S5. Drive the laser according to the drive signal.

The method for controlling a laser array element provided in the method embodiment of the present invention is based on the same inventive concept as the laser array element provided in the device embodiment. For details, see the device embodiment.

Another embodiment of the present invention provides an apparatus for realizing self-stabilization of received light intensity based on a laser array. The implementation basis of the embodiment of the present invention is to have a laser array capable of forming an array beam, and the array beam is composed of lasers with the same wavelength and the same propagation direction Beam composition. The consistency of the propagation direction is easy to control, and the consistency of the laser wavelength is more difficult to control. As can be seen from the previous description, each laser array element disclosed in the embodiments of the present invention can be used for the laser wavelength emitted by its laser. Strict control, so that the lasers emitted by the laser array composed of the laser array elements all have the same wavelength and the same propagation direction.

As shown in FIG. 8, the device includes:

A laser array, which is composed of a plurality of laser array elements, and the laser light emitted by each laser array element has the same wavelength and the same propagation direction. The laser array may be composed of multiple laser array elements provided in the embodiments of the present invention.

An array beam detector, the array beam detector is used to receive the array beam emitted by the laser array and transmit the received optical signal amplitude to the general controller.

Specifically, the array beam detector can convert the received light intensity signal of the array beam into an electrical signal, that is, obtain the amplitude of the optical signal and transmit the amplitude of the obtained optical signal to the general controller in the form of an electrical signal .

Specifically, if the difference is positive and greater than the first threshold, several laser array elements are turned off; if the difference is negative and the absolute value is greater than the second threshold, several laser array elements are turned on.

In fact, the first threshold, the second threshold, and the optical signal amplitude can all be set according to the actual situation. The optical signal amplitude plus the first threshold constitute the upper limit of the feasible reception interval of the optical signal. The value minus the second threshold constitutes the lower limit value of the feasible reception interval of the optical signal, which is a parameter related to the array beam detector. In the feasible reception interval of the optical signal, the noise of the received optical signal is small, the signal noise is relatively high, and the phenomenon of overexposure or underexposure does not occur. The feasible reception interval of the optical signal is directly related to the actual circuit structure of the array beam detector.

In order to simplify the control, the amplitude of the laser light output by each laser array element may be equal.

The embodiment of the present invention discloses a device for realizing self-stabilization of received light intensity based on a laser array. By controlling the total output optical power of the laser array, the light intensity received by the array beam detector is stabilized. The specific method is that the total controller analyzes the gap between the optical signal amplitude received by the array beam detector and the standard value of the optical signal amplitude to control the number of laser array elements in the laser array, and finally achieves the total output optical power. Adjust. The embodiment of the present invention adjusts the laser array based on the gap between the optical signal amplitude and the standard value of the optical signal amplitude, thereby generating a control closed loop. The embodiment of the present invention can achieve self-stabilization of received light intensity only by controlling the opening and closing of the laser array element, which has the advantages of fast response and long life compared with the existing technology that needs to rely on mechanical moving parts, and self-stabilizes the received light intensity In the process, it will not change the performance of the optical receiving system, nor will it increase the external stray light, thus ensuring that the optical signal received by the array beam detector has a high signal-to-noise ratio.

Correspondingly, another embodiment of the present invention also provides a method for achieving self-stabilization of received light intensity based on a laser array, as shown in FIG. 9, including:

S101. The general controller controls the laser array to emit the array beam.

S102. The array beam detector receives the array beam emitted by the laser array, and transmits the received optical signal amplitude to the general controller.

S103. The general controller obtains the difference between the received optical signal amplitude and the standard value of the optical signal amplitude, and controls the opening and closing of each laser array element in the laser array according to the difference. Specifically, if the difference is positive and greater than the first threshold, several laser array elements are turned off; if the difference is negative and the absolute value is greater than the second threshold, several laser array elements are turned on.

The method embodiment of the present invention provides a method for achieving self-stabilization of received light intensity based on a laser array and the device embodiment provides a device for achieving self-stabilization of received light intensity based on a laser array based on the same inventive concept, see the device embodiment for details .

The specification provided here explains a lot of specific details. However, it can be understood that the embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this description.

Similarly, it should be understood that in order to streamline the disclosure and help understand one or more of the various inventive aspects, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together into a single embodiment, Figure, or its description. However, the disclosed method should not be interpreted as reflecting the intention that the claimed invention requires more features than those explicitly recited in each claim. Rather, as reflected in the claims of the present invention, aspects of the invention reside in less than all features of the single embodiment disclosed above. Therefore, the claims that follow the specific embodiment are hereby expressly incorporated into the specific embodiment, where each claim itself serves as a separate embodiment of the present invention.

Those skilled in the art can understand that the modules in the device in the embodiment can be adaptively changed and set in one or more devices different from the embodiment. The modules or units or components in the embodiments may be combined into one module or unit or component, and in addition, they may be divided into a plurality of submodules or subunits or subcomponents. Except that at least some of such features and / or processes or units are mutually exclusive, all features disclosed in this specification (including the accompanying claims, abstract and drawings) and any method so disclosed or All processes or units of equipment are combined. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose.

In addition, those skilled in the art can understand that although the embodiments described herein include certain features included in other embodiments instead of other features, the combination of features of different embodiments means that they are within the scope of the present invention. And form different embodiments. For example, in the claims of the present invention, any one of the claimed embodiments can be used in any combination.

The present invention may also be implemented as a device or system program (such as a computer program and computer program product) for performing part or all of the method described herein. Such a program implementing the present invention may be stored on a computer-readable medium, or may have the form of one or more signals. Such a signal can be downloaded from an Internet website, or provided on a carrier signal, or in any other form.

It should be noted that the above-mentioned embodiments illustrate the present invention rather than limit the present invention, and those skilled in the art can design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs between parentheses should not be constructed as limitations on the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "one" before an element does not exclude the presence of multiple such elements. The invention can be realized by means of hardware including several different elements and by means of a suitably programmed computer. In the unit claims enumerating several systems, several of these systems may be embodied by the same hardware item. The use of the words first, second, and third does not indicate any order, and these words can be interpreted as names.

Claims

A laser array element, the laser array element includes a laser, and is characterized in that the laser array element further includes:

A beam splitting component, which is provided in the exit optical path of the laser, and splits the laser beam emitted by the laser into detection light and reference light;

The gas absorption cell is set on the optical path where the reference light is located;

A detector for receiving reference light passing through the gas absorption cell;

A controller connected to the detector;

A driving module, configured to drive the laser according to the driving signal output by the controller;

The controller includes:

Digital sampling module, used to sample the received electrical signals to obtain digital signals;

An absorption peak analysis module, configured to obtain an absorption peak corresponding to the reference light according to the digital signal;

An offset calculation module, configured to compare the absorption peak corresponding to the reference light with a preset absorption peak to obtain an absorption peak offset;

The driving signal output module is used for generating a driving signal according to the absorption peak offset and transmitting the driving signal to the driving module.
A laser array element according to claim 1, characterized in that:

The driving module includes a current driver, and the current driver is used to input a laser driving current to the laser.
A laser array element according to claim 2, characterized in that:

The driving signal output module includes:

A first driving signal output unit, configured to calculate a DC offset according to the absorption peak offset, and output the DC offset to the current driver;

The current driver includes:

External input unit, used to obtain external drive signals;

The offset signal input unit is used to obtain the DC offset;

A drive current output unit is used to obtain a laser drive current according to the external drive signal and the DC offset, and output the laser drive current to the laser.
A laser array element according to claim 1, characterized in that:

The driving module includes a temperature controller, and the temperature controller is used to input a temperature control current to the laser.
A laser array element according to claim 4, characterized in that:

The driving signal output module includes:

A second driving signal output unit, configured to calculate a temperature setting value according to the absorption peak offset, and output the temperature setting value to the temperature controller;

The temperature controller includes:

The temperature setting unit is used to obtain the temperature setting value output by the second driving signal output unit;

The temperature control current output unit is configured to output a temperature control current to the laser according to the temperature setting value and the temperature of the laser.
A laser array element according to claim 5, characterized in that:

The laser further includes a temperature sensor for acquiring the temperature of the laser;

The temperature controller further includes a feedback temperature acquisition unit, and the feedback temperature acquisition unit is connected to the temperature sensor;

The temperature controller also includes:

A comparator, used to obtain the difference between the temperature setting value and the temperature of the laser;

The temperature control current output unit is further used to output a temperature control current to the laser according to the difference.
A laser array element according to claim 6, wherein the laser further comprises a TEC;

The temperature control current output unit further includes a TEC temperature control driver, and the TEC temperature control driver is used to output a TEC drive current to the laser.
A laser array element according to claim 1, characterized in that:

The drive module includes:

A current driver, the current driver is used to input a laser driving current to the laser;

A temperature controller, the temperature controller is used to input a temperature control current to the laser;

The driving signal output module includes:

A first driving signal output unit, configured to calculate a DC offset according to the absorption peak offset, and output the DC offset to the current driver;

A second driving signal output unit, configured to calculate a temperature setting value according to the absorption peak offset, and output the temperature setting value to the temperature controller;

The comparing unit is configured to judge and activate the first driving signal output unit and / or the second driving signal output unit according to the absorption peak offset.
A laser array element according to claim 1, characterized in that:

The angle between the normal of the optical window of the gas absorption cell and the optical axis of the laser is 5 ° -45 °;

The angle between the normal of the photosensitive surface of the detector and the optical axis of the laser is 5 ° -45 °.
A laser array, characterized by:

A plurality of laser array elements according to any one of claims 1-9.
A device for realizing self-stabilization of received light intensity based on a laser array, comprising at least one laser array according to claim 10, the beam propagation direction of each laser array element in the laser array is the same, and further comprising:

An array beam detector, the array beam detector is used for receiving the array beam emitted by the laser array, and transmitting the amplitude of the received optical signal to the general controller;

The general controller is used to obtain the difference between the received optical signal amplitude and the standard value of the optical signal amplitude, and control the opening and closing of each laser array element in the laser array according to the difference .
The device for realizing self-stabilization of received light intensity based on a laser array according to claim 11, characterized in that if the difference is positive and greater than the first threshold, several laser array elements are turned off; if the difference is If the negative value and the absolute value are greater than the second threshold, several laser array elements are turned on.
A laser control method, characterized in that the method is executed by a laser array element according to any one of claims 1-9, including:

Obtain the digital signal of the reference light passing through the gas absorption cell;

Acquiring the absorption peak corresponding to the reference light according to the digital signal;

Comparing the absorption peak corresponding to the reference light with a preset absorption peak to obtain an absorption peak offset;

Generating a driving signal according to the absorption peak offset;

Drive the laser according to the drive signal.
A laser control method according to claim 13, wherein said generating a driving signal according to said absorption peak offset includes:

Acquiring a driving signal generation strategy; the driving signal generation strategy includes generating a first driving signal and / or generating a second driving signal;

The drive signal is generated according to the drive signal generation strategy and the absorption peak offset.
A laser control method according to claim 14, characterized in that:

If the driving signal generation strategy includes generating a first driving signal, then generating the driving signal according to the driving signal generation strategy and the absorption peak offset includes:

Calculating the DC offset according to the absorption peak offset;

The driving the laser according to the driving signal output by the controller includes:

Obtain external drive signals;

Obtain the DC offset;

The laser drive current is obtained according to the external drive signal and the DC offset, and the laser drive current is output to the laser.
A laser control method according to claim 14, characterized in that:

If the driving signal generation strategy includes generating a second driving signal, generating the driving signal according to the driving signal generation strategy and the absorption peak offset includes:

Calculate the temperature setting value according to the absorption peak offset;

The driving the laser according to the driving signal output by the controller includes:

Obtain the temperature setting value;

According to the temperature setting value and the temperature of the laser, a temperature control current is output to the laser.
A method for achieving self-stabilization of received light intensity based on a laser array, characterized in that the method is implemented by a device for achieving self-stabilization of received light intensity based on a laser array according to any one of claims 11-12, include:

The main controller controls the laser array to emit the array beam;

The array beam detector receives the array beam emitted by the laser array, and transmits the amplitude of the received optical signal to the general controller;

The general controller obtains the difference between the received optical signal amplitude and the standard value of the optical signal amplitude, and controls the opening and closing of each laser array element in the laser array according to the difference.
A method for realizing self-stabilization of received light intensity based on a laser array according to claim 17, wherein if the difference is positive and greater than the first threshold, several laser array elements are turned off; if the If the difference is negative and the absolute value is greater than the second threshold, several laser array elements are turned on.