CN116027500A - Laser power control system and method based on rotary double optical wedges - Google Patents
Laser power control system and method based on rotary double optical wedges Download PDFInfo
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- CN116027500A CN116027500A CN202211596846.7A CN202211596846A CN116027500A CN 116027500 A CN116027500 A CN 116027500A CN 202211596846 A CN202211596846 A CN 202211596846A CN 116027500 A CN116027500 A CN 116027500A
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Abstract
The invention provides a laser power control system and a method based on a rotary double optical wedge, wherein the system comprises the following components: the laser beam sampling device comprises a double-optical-wedge module, a laser coupling module, a laser beam sampling module and a feedback control module, wherein the double-optical-wedge module, the laser coupling module and the laser beam sampling module are sequentially connected in the input and output directions of an optical path, and the laser beam sampling module is connected with the double-optical-wedge module through the feedback control module. According to the invention, the feedback control unit is used for controlling the double-optical-wedge assembly to realize precise adjustment of the optical axis, so that the control of the coupled output laser power is realized, the output laser power is stabilized at a set value, the problem that the coupling efficiency of the laser coupler can cause unstable output laser power due to environmental condition change is solved, the stability of the coupled output laser power is obviously enhanced, and the environmental adaptability of a precise spatial light path system is effectively improved.
Description
Technical Field
The invention relates to the technical field of laser power control, in particular to a laser power control system and method based on a rotary double optical wedge.
Background
An optical wedge is an optical element used in an optical system to change the direction of laser light, and two optical wedges are usually combined together to be used as a double optical wedge. The deflection angle of the emergent light and the position of the optical axis can be changed by rotating the double optical wedges to change the relative rotation angle of the two optical wedges.
In a spatial light path system, it is often necessary to couple laser light in space into a laser coupler and then output through an optical fiber. A double optical wedge is a commonly used optical component for laser coupling, which can couple laser light into a laser coupler by rotating the double optical wedge. The method for controlling the laser power is to control the laser power by controlling an acousto-optic modulator.
Under different working conditions, the elements of the spatial light path system may generate a small deformation due to environmental factors, and the deformation is sufficient to change the path of the laser, affect the coupling efficiency of the laser coupler, and thus cause unstable power of the output light. The control of the acousto-optic modulator on the laser power cannot ensure that the laser power change caused by the laser coupler coupling efficiency change can be compensated, so that how to further improve the power stability of the spatial light path system under different working conditions is a problem to be solved.
Disclosure of Invention
The invention provides a laser power control system and method based on a rotary double optical wedge, aiming at the technical problems in the prior art, and aims to solve the problem of how to further improve the power stability of a space optical path system under different working conditions.
According to a first aspect of the present invention, there is provided a laser power control system based on a rotating double optical wedge, comprising: the laser beam sampling device comprises a double-optical-wedge module, a laser coupling module, a laser beam sampling module and a feedback control module, wherein the double-optical-wedge module, the laser coupling module and the laser beam sampling module are sequentially connected in the input and output directions of an optical path, and the laser beam sampling module is connected with the double-optical-wedge module through the feedback control module;
the double optical wedge module is used for adjusting the optical axis of the incident light beam according to the signal fed back by the feedback control module, so that the output of the laser coupling module is kept stable;
the laser coupling module is used for coupling a laser beam into the photoelectric device and transmitting the coupled beam to the laser beam sampling module;
the laser beam sampling module is used for splitting the coupled laser beam into a first path of split beam and a second path of split beam, transmitting the first path of split beam to the feedback control module and emitting the second path of split beam;
the feedback control module is used for controlling the double-optical-wedge module according to the power of the first path of split light beam, and adjusting the power of the incident light beam so as to keep the power of the split first path of split light beam stable.
On the basis of the technical scheme, the invention can also make the following improvements.
Preferably, the dual-optical-wedge module comprises two optical wedge lenses, and the dual-optical-wedge module controls the optical axis of the incident beam according to the relative rotation angles of the two optical wedge lenses, so as to adjust the angle position of the incident beam to the laser coupling module and realize that the output laser power of the laser coupling module is kept stable.
Preferably, the laser coupling module is an optoelectronic device that requires optical axis alignment to achieve stable output, and includes an optical fiber coupler, an acousto-optic modulator, or a frequency doubling crystal.
Preferably, the laser beam sampling module at least comprises an input port and two output ports;
the input port is used for receiving the coupled light beam injected by the laser coupler;
the two output ports are used for respectively transmitting the first path of split light beams to the feedback control module and emitting the second path of split light beams.
Preferably, the feedback control module comprises an optical power monitoring unit, a controller and an adjusting mechanism;
the optical power monitoring unit is used for monitoring the power of the first path of split light beam transmitted through the laser beam sampling module in real time, converting the split laser power into an electric signal and transmitting the electric signal to the controller;
the controller is used for generating a control signal based on the received electric signal and sending the control signal to the adjusting mechanism;
the adjusting mechanism is used for controlling the double-optical-wedge module to adjust the power of the incident light beam according to the control signal so that the power of the first path of split light beam is equal to a preset value.
Preferably, the laser power control system based on the rotating double optical wedges further comprises: an upper computer;
and the upper computer is used for providing a parameter interface for the controller so that a user can update the parameters of the controller through the upper computer.
Preferably, the control algorithm of the controller is a PID control algorithm or a machine learning method.
According to a second aspect of the present invention, there is provided a laser power control method based on a rotating double optical wedge, comprising:
the double-optical-wedge module transmits the incident light beam subjected to power adjustment to the laser coupling module;
the laser coupling module couples the adjusted incident light beam and transmits the coupled light beam to the laser beam sampling module;
the laser beam sampling module splits the coupled light beams and transmits one path of split light beams to the feedback control module;
and the feedback control module controls the double-optical-wedge module to carry out power adjustment on the incident light beam based on the power of the split light beam until the power of the split light beam is equal to a preset value. The invention provides a laser power control system and a method based on a rotary double optical wedge, wherein the system comprises the following components: the laser beam sampling device comprises a double-optical-wedge module, a laser coupling module, a laser beam sampling module and a feedback control module, wherein the double-optical-wedge module, the laser coupling module and the laser beam sampling module are sequentially connected in the input and output directions of an optical path, and the laser beam sampling module is connected with the double-optical-wedge module through the feedback control module. According to the invention, the feedback control unit is used for controlling the double-optical-wedge assembly to realize precise adjustment of the optical axis, so that the control of the coupled output laser power is realized, the output laser power is stabilized at a set value, the problem that the coupling efficiency of the laser coupler can cause unstable output laser power due to environmental condition change is solved, the stability of the coupled output laser power is obviously enhanced, and the environmental adaptability of a precise spatial light path system is effectively improved.
Drawings
FIG. 1 is a schematic diagram of a laser power control system based on a rotary double optical wedge;
FIG. 2 is a schematic diagram of a feedback control scheme provided by the present invention;
FIG. 3 is a flow chart of a method for controlling laser power based on a rotary double optical wedge.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
Fig. 1 is a schematic structural diagram of a laser power control system based on a rotating dual optical wedge, where, as shown in fig. 1, the system includes: the dual-optical-wedge module 10, the laser coupling module 20, the laser beam sampling module 30 and the feedback control module 40 are sequentially connected in the input-output direction of the optical path, the laser coupling module and the laser beam sampling module are connected with the dual-optical-wedge module through the feedback control module.
The double-optical-wedge module is used for adjusting the optical axis of the incident light beam according to the signal fed back by the feedback control module, so that the output of the laser coupling module is kept stable; the laser coupling module is used for coupling a laser beam into the photoelectric device and transmitting the coupled beam to the laser beam sampling module; the laser beam sampling module is used for splitting the coupled laser beam into a first path of split beam and a second path of split beam, transmitting the first path of split beam to the feedback control module and emitting the second path of split beam; the feedback control module is used for controlling the double-optical-wedge module to adjust the power of the incident light beam based on the power of the first path of split light beam so as to keep the power of the split first path of split light beam stable.
It should be noted that the laser coupling module 20 may be any optoelectronic device that requires precise optical axis alignment to achieve stable output, including but not limited to: fiber coupler, acousto-optic modulator or frequency doubling crystal, etc. The coupling efficiency of the laser coupling module can change due to the change of working conditions, so that the stability of the laser power finally emitted by the laser beam sampler is affected. The optical fiber coupler can be a device for carrying out detachable (movable) connection between optical fibers, and the two end surfaces of the optical fibers are precisely butted so that the light energy output by the transmitting optical fiber can be coupled into the receiving optical fiber to the maximum extent and intervened in an optical link to minimize the influence on a system; the above-mentioned acousto-optic modulator may be a device which can be used to control the power of a laser beam by means of an electrical drive signal, which is based on the acousto-optic effect, i.e. changing the refractive index of certain crystalline or glass materials by means of the oscillating mechanical strain of the acoustic wave (photoelastic effect); as can be seen from the above description, the laser coupling module 20 may be any apparatus or device that needs to implement the precise optical axis alignment automatic correction, which is not limited in this embodiment.
It will be appreciated that the dual wedge optical module 10 described above includes two wedge lenses: a first wedge optic and a second wedge optic.
The included angle range between the two mirror surfaces of the first optical wedge lens, which are close to the second optical wedge lens, and the propagation direction of the laser is 0-45 degrees, and the two mirror surfaces of the first optical wedge lens, which are far away from the second optical wedge lens, are perpendicular to the propagation direction of the laser. The first optical wedge lens and the second optical wedge lens can be adhered to two metal structural members with light passing holes in a distributed mode. The dual optical wedge assembly 10 may be installed in front of the laser coupler 20 through a metal structural member, the dual optical wedge assembly may directly inject the received laser into the laser coupler 20 through an air medium, and the dual optical wedge assembly 10 may control the power of the incident laser according to the relative rotation angles of the two optical wedge lenses.
It should be understood that the laser coupling module 20 and the laser beam sampling module 30 may be connected by an optical fiber. The laser beam sampling module 30 at least includes: an input port and two output ports, the input port is connected with the laser coupling module 20, and one of the two output ports is connected with the feedback control module 40, where the input port is used to receive the coupled light beam injected by the laser coupler; the two output ports are respectively used for transmitting the first path of split light beams to the feedback control module and emitting the second path of split light beams. . The laser beam sampling module 30 and the feedback control module 40 may be connected by an optical fiber.
The feedback control module 40 may receive the laser beam injected from the laser beam sampling module 30 through an optical fiber, and perform power detection on the received laser beam, convert a power signal into an electrical signal, and change the deflection angle of the laser beam emitted from the dual-optical-wedge module 10 and the position of the optical axis according to the electrical signal.
It may be further understood that the power may be kept stable, so that the deviation of the power fluctuates within a preset value range, where the preset value range may be built in the feedback control module when leaving the factory, or may be a threshold set by an administrator or a user through a communication port by using an upper computer, where the threshold may be set according to an actual requirement of an application scenario, which is not limited in this embodiment.
It should be further understood that, by the laser beam sampling module, the coupled laser beam may be split according to a certain splitting ratio, and the feedback control module only needs to detect the power of the laser beam injected into the feedback control module, so as to ensure the stability of the power thereof, and thus, the stability of the laser power at the laser receiving unit may be improved. The laser receiving unit may be a module that needs to use the laser.
It can be appreciated that, based on the defects in the background art, the invention provides a laser power control system and a method based on a rotating double optical wedge, wherein the system comprises: the laser beam sampling device comprises a double-optical-wedge module, a laser coupling module, a laser beam sampling module and a feedback control module, wherein the double-optical-wedge module, the laser coupling module and the laser beam sampling module are sequentially connected in the input and output directions of an optical path, and the laser beam sampling module is connected with the double-optical-wedge module through the feedback control module. According to the invention, the feedback control unit is used for controlling the double-optical-wedge assembly to realize precise adjustment of the optical axis, so that the control of the coupled output laser power is realized, the output laser power is stabilized at a set value, the problem that the coupling efficiency of the laser coupler can cause unstable output laser power due to environmental condition change is solved, the stability of the coupled output laser power is obviously enhanced, and the environmental adaptability of a precise spatial light path system is effectively improved.
As an embodiment, the feedback control module 40 includes: the optical power monitoring unit 41 is respectively connected with one output port of the laser beam sampling module 30 and the controller 42, the controller 42 is respectively connected with the adjusting mechanism 43, and the adjusting mechanism 43 is connected with the double-optical-wedge module 10.
The optical power monitoring unit is used for monitoring the power of the first path of split light beam transmitted through the laser beam sampling module in real time, converting the split laser power into an electric signal and transmitting the electric signal to the controller; the controller is used for generating a control signal based on the received electric signal and sending the control signal to the adjusting mechanism; the adjusting mechanism is used for controlling the double-optical-wedge module to adjust the power of the incident light beam according to the control signal so that the power of the first path of split light beam is equal to a preset value.
It will be appreciated that the control algorithms of the controller described above include, but are not limited to: PID control algorithms or machine learning methods.
Referring to fig. 2, fig. 2 is a schematic diagram of a feedback control; in fig. 2, the adjusting mechanism 43 includes two motors, which are respectively connected to two wedge lenses in the dual-wedge assembly 10 through a rotating device, the optical power detecting module 41 converts the detected power signal of the first beam splitter output by the laser beam sampler 30 into an electrical signal and transmits the electrical signal to the controller 42, the controller 42 compares the electrical signal with a preset value stored in the controller, and generates a control command according to the comparison result to control the two motors to operate, and the two motors control the relative rotation angles of the two wedge lenses in the dual-wedge assembly 10 through a transmission device, so as to change the position of the deflection angle and the optical axis of the outgoing beam of the dual-wedge assembly 10 until the optical power detecting module 41 detects that the power signal of the first beam splitter is restored to the preset value.
As an embodiment, the laser power control system based on the rotating double optical wedges further includes: and an upper computer.
The upper computer is used for providing a parameter interface for the controller so that a user can update parameters of the controller through the upper computer.
It will be appreciated that the controller 42 may also be in communication with a computer device for data interaction, where the computer device is configured to update parameters and control programs in the controller, where the parameters include at least the preset values.
In a possible application scenario, when the output power of the laser coupler 20 changes, that is, when the coupling efficiency of the laser coupler 20 changes, the optical power monitoring module 41 converts the monitored power signal change into an electrical signal and transmits the electrical signal to the controller 42, and at this time, the controller 42 sends a control instruction to the motor 43 according to the set value of the host computer of the computer 50, so that the motor 43 rotates by a certain angle until the signal monitored by the optical power monitoring module 41 is restored to the set value.
Referring to fig. 3, fig. 3 is a flowchart of a laser power control method based on a rotating double optical wedge according to an embodiment of the present invention, as shown in fig. 3, a laser power control method based on a rotating double optical wedge includes:
step S100: the double-optical-wedge module transmits the incident light beam subjected to power adjustment to the laser coupling module;
step S200: the laser coupling module couples the adjusted incident light beam and transmits the coupled light beam to the laser beam sampling module;
step S300: the laser beam sampling module splits the coupled light beams and transmits one path of split light beams to the feedback control module;
step S400: and the feedback control module controls the double-optical-wedge module to carry out power adjustment on the incident light beam based on the power of the split light beam until the power of the split light beam is equal to a preset value.
It can be understood that the laser power control method based on the rotating double optical wedges provided by the present invention corresponds to the laser power control system based on the rotating double optical wedges provided in the foregoing embodiments, and the relevant technical features of the laser power control method based on the rotating double optical wedges may refer to the relevant technical features of the laser power control system based on the rotating double optical wedges, which are not described herein again.
The invention provides a laser power control system and a method based on a rotary double optical wedge, wherein the system comprises the following components: the laser beam sampling device comprises a double-optical-wedge module, a laser coupling module, a laser beam sampling module and a feedback control module, wherein the double-optical-wedge module, the laser coupling module and the laser beam sampling module are sequentially connected in the input and output directions of an optical path, and the laser beam sampling module is connected with the double-optical-wedge module through the feedback control module. According to the invention, the feedback control unit is used for controlling the double-optical-wedge assembly to realize precise adjustment of the optical axis, so that the control of the coupled output laser power is realized, the output laser power is stabilized at a set value, the problem that the coupling efficiency of the laser coupler can cause unstable output laser power due to environmental condition change is solved, the stability of the coupled output laser power is obviously enhanced, and the environmental adaptability of a precise spatial light path system is effectively improved.
In the foregoing embodiments, the descriptions of the embodiments are focused on, and for those portions of one embodiment that are not described in detail, reference may be made to the related descriptions of other embodiments.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. A laser power control system based on a rotating double optical wedge, the system comprising: the laser beam sampling device comprises a double-optical-wedge module, a laser coupling module, a laser beam sampling module and a feedback control module, wherein the double-optical-wedge module, the laser coupling module and the laser beam sampling module are sequentially connected in the input and output directions of an optical path, and the laser beam sampling module is connected with the double-optical-wedge module through the feedback control module;
the double optical wedge module is used for adjusting the optical axis of the incident light beam according to the signal fed back by the feedback control module, so that the output of the laser coupling module is kept stable;
the laser coupling module is used for coupling a laser beam into the photoelectric device and transmitting the coupled beam to the laser beam sampling module;
the laser beam sampling module is used for splitting the coupled laser beam into a first path of split beam and a second path of split beam, transmitting the first path of split beam to the feedback control module and emitting the second path of split beam;
the feedback control module is used for controlling the double-optical-wedge module according to the power of the first path of split light beam, and adjusting the power of the incident light beam so as to keep the power of the split first path of split light beam stable.
2. The system of claim 1, wherein the dual-wedge module comprises two wedge lenses, and the dual-wedge module controls the optical axis of the incident beam according to the relative rotation angle of the two wedge lenses, so as to adjust the angular position of the incident beam to the laser coupling module and realize that the output laser power of the laser coupling module remains stable.
3. The system of claim 1, wherein the laser coupling module is an optoelectronic device that requires optical axis alignment to achieve stable output, and comprises a fiber coupler, an acousto-optic modulator, or a frequency doubling crystal.
4. The rotary dual wedge based laser power control system of claim 1, wherein the laser beam sampling module comprises at least one input port and two output ports;
the input port is used for receiving the coupled light beam injected by the laser coupler;
the two output ports are used for respectively transmitting the first path of split light beams to the feedback control module and emitting the second path of split light beams.
5. The rotary dual wedge based laser power control system of claim 1, wherein the feedback control module comprises an optical power monitoring unit, a controller, and an adjustment mechanism;
the optical power monitoring unit is used for monitoring the power of the first path of split light beam transmitted through the laser beam sampling module in real time, converting the split laser power into an electric signal and transmitting the electric signal to the controller;
the controller is used for generating a control signal based on the received electric signal and sending the control signal to the adjusting mechanism;
the adjusting mechanism is used for controlling the double-optical-wedge module to adjust the power of the incident light beam according to the control signal so that the power of the first path of split light beam is equal to a preset value.
6. The rotating double optical wedge based laser power control system of claim 5, further comprising: an upper computer;
and the upper computer is used for providing a parameter interface for the controller so that a user can update the parameters of the controller through the upper computer.
7. The rotating double wedge based laser power control system of claim 5, wherein the control algorithm of the controller is a PID control algorithm or a machine learning method.
8. The laser power control method based on the rotary double optical wedges is characterized by comprising the following steps of:
the double-optical-wedge module transmits the incident light beam subjected to power adjustment to the laser coupling module;
the laser coupling module couples the adjusted incident light beam and transmits the coupled light beam to the laser beam sampling module;
the laser beam sampling module splits the coupled light beams and transmits one path of split light beams to the feedback control module;
and the feedback control module controls the double-optical-wedge module to carry out power adjustment on the incident light beam based on the power of the split light beam until the power of the split light beam is equal to a preset value.
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| CN202211596846.7A CN116027500A (en) | 2022-12-12 | 2022-12-12 | Laser power control system and method based on rotary double optical wedges |
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