CN116435862A - Laser light intensity stabilizing device based on numerical control feedback - Google Patents
Laser light intensity stabilizing device based on numerical control feedback Download PDFInfo
- Publication number
- CN116435862A CN116435862A CN202310255394.4A CN202310255394A CN116435862A CN 116435862 A CN116435862 A CN 116435862A CN 202310255394 A CN202310255394 A CN 202310255394A CN 116435862 A CN116435862 A CN 116435862A
- Authority
- CN
- China
- Prior art keywords
- light intensity
- laser
- light
- numerical control
- acousto
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention provides a laser light intensity stabilizing device based on numerical control feedback, which comprises a beam shaping module, a laser control module and a laser control module, wherein the beam shaping module is used for shaping and collimating laser output by a semiconductor laser; the beam splitting module is used for splitting laser into an output beam and a detection beam, and the detection beam is used for carrying out numerical control feedback adjustment; the numerical control feedback adjustment module detects the light intensity of the detection light beam, so that the acousto-optic modulation of the laser beam in the beam shaping module in a differential feedback mode is carried out, and the light intensity of the output light beam is stabilized at a corresponding intensity value; the laser light intensity stabilizing device directly stabilizes the laser light intensity by combining light intensity detection and numerical control feedback, stabilizes the light intensity of the semiconductor laser at any value in a certain working range by an acousto-optic modulation mode, and can realize the visualization and accurate stabilization of the light intensity of the semiconductor laser by only carrying out simple operation on a computer.
Description
Technical Field
The invention relates to the technical field of laser modulation, in particular to a laser light intensity stabilizing device based on numerical control feedback.
Background
The laser is widely applied to different fields of industry, communication, medicine and the like, and the laser light intensity output by the laser is used as an important performance parameter of the laser, so that the laser has a key effect on the operation of the laser. The laser light intensity is used as the only physical quantity of the laser which can be checked by the photoelectric detector, and the change of the light intensity has a non-negligible influence on the monitoring result and the processing effect. For example, in spectral measurements, jitter in the laser intensity can cause significant background noise. For semiconductor lasers, the main methods of stabilizing the light intensity include internal control and external feedback control. The internal control is concentrated on the accurate control of current and the temperature compensation of the semiconductor laser, and the external feedback control is concentrated on the light intensity feedback adjustment of an acousto-optic modulation mode of the laser by using the feedback stabilizing device, so that the stability of output light intensity is realized. The existing light intensity stabilizing device based on PID external feedback can realize light intensity stabilization within a set range, and the devices have high manufacturing cost and inconvenient operation, and can not perform visual convenient light intensity stabilizing modulation on the semiconductor laser.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a laser light intensity stabilizing device based on numerical control feedback, which comprises a beam shaping module, a laser processing module and a laser processing module, wherein the beam shaping module is used for shaping and collimating laser output by a semiconductor laser; the beam splitting module is used for splitting laser into an output beam and a detection beam, and the detection beam is used for carrying out numerical control feedback adjustment; the numerical control feedback adjustment module detects the light intensity of the detection light beam, so that the acousto-optic modulation of the laser beam in the beam shaping module in a differential feedback mode is carried out, and the light intensity of the output light beam is stabilized at a corresponding intensity value; the laser light intensity stabilizing device directly stabilizes the laser light intensity by combining light intensity detection and numerical control feedback, stabilizes the light intensity of the semiconductor laser at any value in a certain working range by an acousto-optic modulation mode, and can realize the visualization and accurate stabilization of the light intensity of the semiconductor laser by only carrying out simple operation on a computer.
The invention provides a laser light intensity stabilizing device based on numerical control feedback, which comprises:
the beam shaping module comprises a shaping prism and a collimating lens group which are sequentially arranged along the light emitting direction of the semiconductor laser;
the beam splitting module is arranged at a position downstream of the beam shaping module in the light emitting direction and is used for splitting the laser beam emitted from the collimating lens group into an output beam and a detection beam;
the numerical control feedback adjustment module is arranged on the detection light beam and comprises a light intensity detection submodule and a sound light adjustment submodule which are connected with each other;
the light intensity detection submodule is used for detecting the light intensity of the detection light beam;
and the acousto-optic modulation submodule is used for carrying out acousto-optic modulation on the laser beam in the beam shaping module in a differential feedback mode according to the light intensity, so that the light intensity of the output beam is stabilized at a corresponding intensity value.
Further, the collimating lens group comprises a first lens and a second lens which are sequentially arranged along the light emergent direction; the distance between the first lens and the second lens is equal to the sum of the focal length of the first lens and the focal length of the second lens.
Further, the light splitting module comprises a half glass slide and a polarization splitting prism which are sequentially arranged along the light emitting direction.
Further, after the laser beam emitted from the collimating lens group sequentially passes through the half glass slide and the polarization beam splitter prism, the beam emitted from the polarization beam splitter prism is reflected as the output beam, and the beam emitted from the polarization beam splitter prism is transmitted as the detection beam.
Further, a reflecting mirror is further arranged on the light path of the output light beam emitted by the light splitting module, and is used for deflecting and reflecting the output light beam.
Further, the light intensity detection submodule comprises a light power meter.
Further, the acousto-optic modulation submodule comprises a computer, an amplifying circuit, a radio frequency driver and an acousto-optic crystal;
the computer is connected with the light intensity detection submodule and is used for carrying out differential processing according to the light intensity and the target light intensity to generate a control voltage signal;
the computer is also connected with the amplifying circuit and is used for outputting the control voltage signal to the amplifying circuit; the amplifying circuit is used for amplifying the control voltage signal;
the amplifying circuit is connected with the radio frequency driver and is used for outputting the amplified control voltage signal to the radio frequency driver;
the radio frequency driver is connected with the acousto-optic crystal and is used for applying an acoustic wave field to the acousto-optic crystal according to the amplified control voltage signal.
Further, the computer is connected with the amplifying circuit through an earphone wire; one end of the earphone wire is connected with the earphone port of the computer, and the other end of the earphone wire is connected with the amplifying circuit through a BNC connector.
Further, the acousto-optic crystal is arranged inside the collimating lens group.
Further, the acousto-optic crystal is tellurium dioxide.
Compared with the prior art, the laser light intensity stabilizing device based on numerical control feedback comprises a beam shaping module for shaping and collimating laser output by a semiconductor laser; the beam splitting module is used for splitting laser into an output beam and a detection beam, and the detection beam is used for carrying out numerical control feedback adjustment; the numerical control feedback adjustment module detects the light intensity of the detection light beam, so that the acousto-optic modulation of the laser beam in the beam shaping module in a differential feedback mode is carried out, and the light intensity of the output light beam is stabilized at a corresponding intensity value; the laser light intensity stabilizing device directly stabilizes the laser light intensity by combining light intensity detection and numerical control feedback, stabilizes the light intensity of the semiconductor laser at any value in a certain working range by an acousto-optic modulation mode, and can realize the visualization and accurate stabilization of the light intensity of the semiconductor laser by only carrying out simple operation on a computer.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a laser intensity stabilizing device based on numerical control feedback.
Reference numerals: 1. a semiconductor laser; 2. shaping prism; 3. a first lens; 4. an acousto-optic crystal; 5. a second lens; 6. one half of the slide; 7. a polarization beam splitter prism; 8. a reflecting mirror; 9. a power meter; 10. a computer; 11. an earphone line; 12. an amplifying circuit; 13. a radio frequency driver.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a schematic structural diagram of a laser light intensity stabilizing device based on numerical control feedback according to an embodiment of the present invention is shown. The laser light intensity stabilizing device based on the numerical control feedback comprises a beam shaping module, a beam splitting module and a numerical control feedback adjusting module. The beam shaping module is used for shaping and collimating and adjusting the laser beam output by the semiconductor laser 1, so as to ensure the beam quality of the laser beam. The beam splitting module is arranged at the downstream position of the beam shaping module in the light emitting direction, and after the laser beam output by the beam shaping module enters the beam splitting module, the laser beam is split into an output beam and a detection beam by the beam splitting module, wherein the output beam can be used for carrying out actual laser measurement or processing and other operations, and the detection beam is used as a reference beam for carrying out numerical control feedback light intensity adjustment on the semiconductor laser. The numerical control feedback adjustment module is arranged on the detection light beam and comprises a light intensity detection submodule and a sound light adjustment submodule which are connected with each other; detecting the light intensity of the detection light beam through a light intensity detection submodule, so as to provide a reference basis for subsequent numerical control feedback light intensity adjustment; the acousto-optic modulation submodule carries out acousto-optic modulation in a differential feedback mode on the laser beam in the beam shaping module according to the light intensity, so that the light intensity of the output light beam is stabilized at a corresponding intensity value, and the acousto-optic modulation submodule carries out acousto-optic modulation on the light beam output by the semiconductor laser in a PID feedback control mode, so that the light intensity of the laser output by the semiconductor laser can be stabilized at a corresponding light intensity value.
In the beam shaping module, the shaping prism 2 may be a wedge prism pair capable of shaping a beam cross section of the laser beam, and when the laser beam emitted from the semiconductor laser 1 is transmitted through the wedge prism pair, the beam cross section of the laser beam is changed from an elliptical shape to a circular shape. The collimator lens group is used for collimating and adjusting the laser beam emitted from the shaping prism 2. The collimating lens group may include a first lens 3 and a second lens 5 sequentially disposed in the light-exiting direction; the distance between the first lens 3 and the second lens 5 is equal to the sum of the focal length of the first lens 3 and the focal length of the second lens 5, so that the first lens 3 and the second lens 5 constitute a 4f optical system, thereby performing collimation adjustment on the laser beam. Preferably, the focal length of the first lens 3 and the focal length of the second lens 5 may be the same or different, and when the focal lengths of the two lenses are different, the collimator lens group is also capable of expanding or contracting the laser beam.
The spectroscopic module may include a half glass 6 and a polarization beam splitter prism 7 arranged in this order along the light-emitting direction of the semiconductor laser 1. The laser beam emitted by the semiconductor laser 1 is linearly polarized light, and the laser beam emitted by the beam shaping module is divided into two output beams and detection beams with equal light intensity through a half glass slide 6 and a polarization beam splitter prism 7 in sequence; preferably, after the laser beam emitted from the collimator lens group passes through the half glass 6 and the polarization beam splitter prism 7 in order, the emitted beam is reflected from the polarization beam splitter prism 7 as an output beam, and the emitted beam is transmitted from the polarization beam splitter prism 7 as a probe beam. The optical path corresponding to the output light beam can be further provided with a reflecting mirror 8, and the reflecting mirror 8 can be arranged at a certain inclination angle with the propagation direction of the output light beam, so that the output light beam is deflected and reflected at a corresponding angle.
In the numerical control feedback adjustment module, the light intensity detection submodule comprises an optical power meter 9; wherein the optical power meter 9 may be, but is not limited to, a PM100D optical power meter developed by Thorlabs corporation. The optical power meter 9 is disposed on a light path corresponding to the probe beam, and is configured to detect the light intensity of the probe beam, and input the light intensity to the acousto-optic modulation sub-module, so as to serve as a reference basis for performing acousto-optic modulation on the semiconductor laser.
The acousto-optic modulation submodule comprises a computer 10, an amplifying circuit 12, a radio frequency driver 13 and an acousto-optic crystal 4. Wherein, the computer 10 can be, but is not limited to, a Dall Precision3571 notebook computer, and the Labview program can be installed and run on the computer 5; the amplifying circuit 12 may be, but is not limited to, an F10A or F10AD voltage amplifier developed by FLC company in sweden; the rf driver 13 may be, but is not limited to, an OEM aaopoto-electrotechnical rf driver developed by helner corporation. The computer 10 is internally provided with a Labview program, namely Laboratory Virtual Instrument Engineering Workbench, which is an integrated program developed by the national instruments Ni, so that after the computer 10 receives the light intensity detected by the optical power meter 9, the light intensity is directly displayed on a Labview program interface, and a user can directly input the light intensity value expected to be stable by the semiconductor laser 1 through the Labview program interface, thereby realizing the visual light intensity modulation of the semiconductor laser 1.
The computer 10 is connected with a light intensity detection submodule and is used for carrying out differential processing according to the light intensity and the target light intensity to generate a control voltage signal, and the light intensity detected by the light power meter 9 is input into the computer 10 and then is converted into the control voltage signal by a sound card of the computer 10. The computer 10 is connected with the amplifying circuit 12 through an earphone wire 11; one end of the earphone wire 11 is connected with an earphone port of the computer 10, and the other end is connected with the amplifying circuit 12 through a BNC connector; the amplifying circuit 12 amplifies the received control voltage signal and transmits the amplified control voltage signal to the radio frequency driver 17. The amplifying circuit 12 is connected with the radio frequency driver 13 and is used for outputting the amplified control voltage signal to the radio frequency driver 13; the radio frequency driver 13 is connected with the acousto-optic crystal 4 and is used for applying an acoustic wave field to the acousto-optic crystal 4 according to the amplified control voltage signal, so that the acousto-optic crystal 4 can perform acousto-optic modulation on the laser beam transmitted through the acousto-optic crystal 4, and the light intensity stability of the laser beam is realized. The acousto-optic crystal 4 may be, but is not limited to, model 3110-120 tellurium dioxide acousto-optic crystal manufactured by Gooch & Housego company. The acousto-optic crystal 4 may also be arranged inside the collimating lens group, preferably between the first lens 3 and the second lens 5.
The working process of the laser light intensity stabilizing device based on numerical control feedback is as follows: the laser beam output by the semiconductor laser 1 is shaped into a light spot shape by a shaping prism 2, collimated and focused by a first lens 3 and a second lens 5, and polarized and split by a half glass slide 6 and a polarized and split prism 7 to obtain an output beam and a detection beam, wherein the light intensity of the detection beam can be, but is not limited to, a few milliwatts. After the optical power meter 9 detects the light intensity of the probe beam, the light intensity detection result is transmitted to the computer 10, and the computer 10 displays the light intensity value of the probe beam. When the light intensity of the semiconductor laser 1 needs to be regulated stably, a user inputs a target light intensity value of the laser which needs to be regulated on a Labview program interface of the computer 10, and after the Labview program is run, a difference value operation is performed on the target light intensity value and the light intensity value detected by the light power meter 9, and the obtained difference value is sent to the Labview program. If the difference is equal to 0 (which indicates that the laser intensity value output by the semiconductor laser 1 is the same as the target intensity value), the Labview program will output a constant value, and the sound card of the computer 10 will not output a voltage signal to the amplifying circuit at this time, that is, the sound optical crystal 4 will not need to be touched to perform acousto-optic modulation on the laser beam. If the difference is not equal to 0 (at this time, the laser light intensity value output by the semiconductor laser 1 is indicated to be different from the target light intensity value), the Labview program performs an integral feedback modulation working mode, and sends a control voltage signal to the amplifying circuit 12 and the radio frequency driver 13 through the sound card of the computer 10, so as to control the acousto-optic crystal 4 to perform light intensity modulation on laser, and finally adjusts the laser light intensity output by the semiconductor laser 1 to be the same as the target light intensity value through continuous cyclic feedback acousto-optic modulation, so that the laser light intensity stability of the semiconductor laser 1 is realized. Compared with the existing method for stabilizing the light intensity, the laser intensity stabilizing process has the characteristic of simplicity in operation, the laser intensity stabilizing effect of the semiconductor laser can be realized within the working range only by inputting a set target light intensity value in a Labview program, and the effect of stabilizing the laser intensity is completely dependent on the precision of the optical power meter and is not interfered by the external environment. By observing records, the laser light intensity stabilizing device can realize long-time stabilization of laser light intensity. Compared with the existing method for stabilizing the light intensity, the method provided by the invention has the advantages that equipment such as a PID module, a detector and the like is needed, and the conversion of digital signals and voltage signals is realized by only using one computer and the sound card output of the earphone port of the computer, so that the stability of the light intensity of laser is realized.
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 (10)
1. Laser light intensity stabilization device based on numerical control feedback includes:
the beam shaping module comprises a shaping prism and a collimating lens group which are sequentially arranged along the light emitting direction of the semiconductor laser;
the beam splitting module is arranged at a position downstream of the beam shaping module in the light emitting direction and is used for splitting the laser beam emitted from the collimating lens group into an output beam and a detection beam;
the numerical control feedback adjustment module is arranged on the detection light beam and comprises a light intensity detection submodule and a sound light adjustment submodule which are connected with each other;
the light intensity detection submodule is used for detecting the light intensity of the detection light beam;
and the acousto-optic modulation submodule is used for carrying out acousto-optic modulation on the laser beam in the beam shaping module in a differential feedback mode according to the light intensity, so that the light intensity of the output beam is stabilized at a corresponding intensity value.
2. The laser light intensity stabilizing device based on numerical control feedback as set forth in claim 1, wherein: the collimating lens group comprises a first lens and a second lens which are sequentially arranged along the light emergent direction; the distance between the first lens and the second lens is equal to the sum of the focal length of the first lens and the focal length of the second lens.
3. The laser light intensity stabilizing device based on numerical control feedback as set forth in claim 1, wherein: the light splitting module comprises a half glass slide and a polarization light splitting prism which are sequentially arranged along the light emitting direction.
4. A laser intensity stabilization apparatus based on numerical control feedback as claimed in claim 3, wherein: after the laser beams emitted from the collimating lens group sequentially pass through the half glass slide and the polarization beam splitter prism, the light beams emitted from the polarization beam splitter prism are reflected to be used as output light beams, and the light beams emitted from the polarization beam splitter prism are transmitted to be used as detection light beams.
5. The laser light intensity stabilizing device based on numerical control feedback as set forth in claim 1, wherein: and a reflecting mirror is further arranged on the light path of the output light beam emitted by the light splitting module and used for deflecting and reflecting the output light beam.
6. The laser light intensity stabilizing device based on numerical control feedback as set forth in claim 1, wherein: the light intensity detection submodule comprises a light power meter.
7. The laser light intensity stabilizing device based on numerical control feedback as set forth in claim 1, wherein: the acousto-optic modulation submodule comprises a computer, an amplifying circuit, a radio frequency driver and an acousto-optic crystal; the computer is connected with the light intensity detection submodule and is used for carrying out differential processing according to the light intensity and the target light intensity to generate a control voltage signal;
the computer is also connected with the amplifying circuit and is used for outputting the control voltage signal to the amplifying circuit; the amplifying circuit is used for amplifying the control voltage signal;
the amplifying circuit is connected with the radio frequency driver and is used for outputting the amplified control voltage signal to the radio frequency driver;
the radio frequency driver is connected with the acousto-optic crystal and is used for applying an acoustic wave field to the acousto-optic crystal according to the amplified control voltage signal.
8. The numerical control feedback-based laser intensity stabilization device as claimed in claim 7, wherein: the computer is connected with the amplifying circuit through an earphone wire; one end of the earphone wire is connected with the earphone port of the computer, and the other end of the earphone wire is connected with the amplifying circuit through a BNC connector.
9. The numerical control feedback-based laser intensity stabilization device as claimed in claim 7, wherein: the acousto-optic crystal is arranged in the collimating lens group.
10. The numerical control feedback-based laser intensity stabilization device as claimed in claim 7, wherein:
the acousto-optic crystal is tellurium dioxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310255394.4A CN116435862A (en) | 2023-03-16 | 2023-03-16 | Laser light intensity stabilizing device based on numerical control feedback |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310255394.4A CN116435862A (en) | 2023-03-16 | 2023-03-16 | Laser light intensity stabilizing device based on numerical control feedback |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116435862A true CN116435862A (en) | 2023-07-14 |
Family
ID=87080633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310255394.4A Pending CN116435862A (en) | 2023-03-16 | 2023-03-16 | Laser light intensity stabilizing device based on numerical control feedback |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116435862A (en) |
-
2023
- 2023-03-16 CN CN202310255394.4A patent/CN116435862A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10634608B2 (en) | Optical absorption spectroscopy based gas analyzer systems and methods | |
| US7036979B2 (en) | Photothermal transducing spectroscopic analyzer | |
| CN113503901B (en) | Device and method for eliminating measurement signal jitter of white light interferometer | |
| WO2021036167A1 (en) | Apparatus for measuring fp transmittance curve using whispering gallery mode laser light source, and method | |
| CN105547197A (en) | Method and device for simultaneously measuring angle and vibration based on laser self mixing interference | |
| CN110911963B (en) | High-stability polarization spectrum frequency stabilizer | |
| CN104914443B (en) | A kind of high-precision laser range-finding method of quick scanning | |
| CN203965129U (en) | Scanning confocal chamber F-P interferometer Free Spectral Range measuring system | |
| JP4853255B2 (en) | Gas analyzer | |
| CN116435862A (en) | Laser light intensity stabilizing device based on numerical control feedback | |
| CN102636337A (en) | Method for measuring optical fiber dispersion | |
| CN105203223A (en) | Device for measuring temperature of flame through one-dimensional scanning on basis of CARS | |
| WO2021169518A1 (en) | Wavelength meter, method for obtaining parameter of wavelength meter, and method for online calibration | |
| CN111982478A (en) | Method and device for measuring optical diffraction loss of laser pore pipeline | |
| CN115755424B (en) | Optical path collimation device and method based on optical enhancement cavity mode matching | |
| US6900883B2 (en) | Wavelength dependence measuring system | |
| US20230288188A1 (en) | Optical interference range sensor | |
| CN104101483B (en) | A kind of scanning confocal chamber F-P interferometer Free Spectral Range measures system | |
| CN113804315B (en) | Laser scanning frequency bandwidth calibration device and calibration method | |
| JP3317654B2 (en) | Chromatic dispersion measuring device for optical components using delay unit | |
| CN109883952B (en) | Nonlinear coefficient measuring device based on weak measurement technology and measuring method thereof | |
| JP2001183398A (en) | Measurement signal outputting device | |
| CN114838817A (en) | Stable light splitting method and device for laser beam and method and device for calibrating laser power meter | |
| CN116707635A (en) | Bandwidth testing method and device, electronic equipment and storage medium | |
| CN114966719A (en) | Distance measurement method based on nonlinear optical fiber |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |