CN219143208U - Pulsed laser beam combining device and code disc - Google Patents
Pulsed laser beam combining device and code disc Download PDFInfo
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- CN219143208U CN219143208U CN202223422981.8U CN202223422981U CN219143208U CN 219143208 U CN219143208 U CN 219143208U CN 202223422981 U CN202223422981 U CN 202223422981U CN 219143208 U CN219143208 U CN 219143208U
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Abstract
The application provides a pulse laser beam combining device, which comprises a code disc, a driving device, a synchronous signal source and a signal delay device; the code wheel comprises a first area for projecting a light beam and a second area for reflecting the light beam; the synchronous signal source is connected with the first laser and the driving device and is used for providing a synchronous signal and controlling the laser pulse emission of the first laser and the rotation of the driving device; the signal delayer is connected with the synchronous signal source and the second laser and is used for delaying the synchronous signal; the code disc is arranged on the driving device, and the laser pulse of the first laser and the laser pulse of the second laser respectively project the corresponding positions of the front side and the back side of the code disc; when the laser device works, the driving device drives the code disc to rotate, so that the laser pulse of the first laser is transmitted by the first area, the laser pulse of the second laser is reflected by the second area, and the reflected light beam and the transmitted light beam are combined into one beam. The laser pulse beam is combined through projection and reflection on the code wheel, so that the laser beam combining device is suitable for different occasions and improves laser beam combining efficiency.
Description
Technical Field
The application relates to the technical field of lasers, in particular to a pulse laser beam combining device and a code disc.
Background
With the rapid development of industrial applications such as laser processing, the requirements for laser beam combination are also increasing. The existing laser beam combining modes have various, and common beam combining modes can be divided into coherent beam combining and incoherent beam combining according to the coherence of the combined laser. The coherent beam combination is also called array phase locking, the beam combination technology requires that each light emitting unit of the semiconductor laser array is excited by the same spectrum, and the phase relation among the units is also required to be controlled so as to ensure that a beneficial interference can be generated, so that the technology has extremely high requirements on the stability of the environment temperature and the precision of an instrument, and has complex process and is not easy to obtain high-power stable output of an in-phase supermode. And the coherent output power is only of the W-stage due to the intense mode competition.
Compared with coherent beam combination, the incoherent beam combination has stronger adaptability, can not be limited by factors such as phase, wavelength, polarization state and the like of a laser, can obtain beam combination output similar to the beam quality of a light emitting unit after the incoherent beam combination, has relatively simpler working principle and easier operation, and therefore, the application of the incoherent beam combination is wider.
Presently, incoherent combined beams can be classified into various types according to a specific principle. There are commonly prism beam combining, polarization beam combining, grating beam combining, incoherent fiber beam combining, wavelength beam combining, and the like. The beam combination forms have respective advantages and disadvantages and are respectively suitable for different application scenes. For example, the prism beam combination damage threshold is low, the beam combination efficiency is low, and the prism beam combination efficiency is suitable for scenes with low power and no requirement on the beam combination efficiency; the polarization beam combining efficiency is higher, but the damage threshold is low, and the method is suitable for low-power scenes. The grating beam combination efficiency is high, the high temperature resistance is high, the cost is high, and the grating beam combination device is suitable for scenes with high power.
Therefore, in order to enable incoherent beam combination to be better suitable for different occasions, the influence of laser power is reduced, and meanwhile, the laser beam combination efficiency can be improved, so that the problem which is needed to be solved at present is solved urgently.
Disclosure of Invention
The application provides a pulsed laser beam combining device to solve the current incoherent beam combining and to adapt to the occasion requirement higher, the lower problem of laser beam combining efficiency. The application additionally provides a code disc which is used for the pulse laser beam combining device.
The embodiment of the application provides a pulse laser beam combining device, which comprises a code disc, a driving device, a synchronous signal source and a signal delay device;
the code wheel comprises a first area for transmitting light beams and a second area for reflecting light beams;
the synchronous signal source is respectively connected with the first laser and the driving device and is used for providing a synchronous signal, controlling the laser pulse emission of the first laser and driving the driving device to rotate;
the signal delayer is respectively connected with the synchronous signal source and the second laser and is used for delaying the synchronous signal for a period of time;
the code disc is arranged on the driving device, and the laser pulse of the first laser and the laser pulse of the second laser are respectively projected at the corresponding positions of the front side and the back side of the code disc;
when the laser device works, the driving device drives the code wheel to rotate, so that laser pulses of the first laser are transmitted by the first area, laser pulses of the second laser are reflected by the second area, and the reflected light beam and the transmitted light beam are combined into one beam.
Optionally, the first areas and the second areas are alternately arranged circumferentially with the rotation axis of the code wheel as a center and at the same distance from the center.
Optionally, the code disc is a circular disc.
Optionally, the transmission area is a transmission hole provided on the code wheel.
Optionally, the transmission hole is a rectangular hole, a circular hole or a fan-shaped hole.
Optionally, a reflective film is disposed on the second area reflective surface.
Optionally, the pulse frequency of the first laser and the second laser is f, and the number of the first area and the second area is N (N > =1), then:
k*N＝f；
where k is the rotational speed of the drive.
Optionally, the signal delayer delays the synchronization signal for a period of time that is one half of a delay laser pulse period.
The embodiment of the application provides a code wheel for pulsed laser beam combining device, the code wheel is circular disc, is provided with light transmission district and reflection district along its circumference periodicity, light transmission district and reflection district's quantity is the same the disc center is provided with and is used for assembling the epaxial mounting hole of drive to drive arrangement.
Compared with the prior art, the application has the following advantages:
the embodiment of the application provides a pulse laser beam combining device, which comprises a code disc, a driving device, a synchronous signal source and a signal delay device; the code wheel comprises a first area for transmitting light and a second area for reflecting light; the synchronous signal source is respectively connected with the first laser and the driving device and is used for providing a synchronous signal, controlling the laser pulse emission of the first laser and driving the driving device to rotate; the signal delayer is respectively connected with the synchronous signal source and the second laser and is used for delaying the synchronous signal for a period of time; the code disc is arranged on the driving device, and the laser pulse of the first laser and the laser pulse of the second laser are respectively projected at the corresponding positions of the front side and the back side of the code disc; during operation, drive arrangement drives the code wheel is rotatory, makes the laser pulse of first laser instrument by first regional transmission, the laser pulse of second laser instrument by the second regional reflection, just the reflection light beam of reflection with the transmission light beam of transmission merges into a beam, and this application is through transmission and reflection on the code wheel with the pulse laser beam on the code wheel merge into a beam, receives the power and the influence of energy of laser less for incoherent beam combination is lower to market demand, and improves laser beam combination efficiency.
Drawings
Fig. 1 is a schematic diagram of a pulsed laser beam combining device according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a code wheel according to an embodiment of the present application;
FIG. 3 is a schematic diagram of the operation of a first laser in an embodiment of the present application;
FIG. 4 is a schematic diagram of the operation of a second laser in an embodiment of the present application;
fig. 5 is a schematic structural diagram of a code disc with N of 50 in the embodiment of the present application.
Reference numerals:
11: a first laser; 12: a second laser;
20: a synchronization signal source;
30: a signal delayer;
40: a driving device;
50: a code wheel; 501: a first region; 502: a second region.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other ways than those herein described and similar generalizations can be made by those skilled in the art without departing from the spirit of the application and the application is therefore not limited to the specific embodiments disclosed below.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.
In this application, unless explicitly stated or limited otherwise, the terms "mounted," "connected," "disposed," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
In the related art, the situation of laser beam combination is complex, especially the non-related laser beam combination needs to be selected according to different application occasions, the requirement on the application occasion is high, and the laser beam combination efficiency is low. In view of this, the present application provides a pulsed laser beam combining device, including a code wheel, a driving device, a synchronization signal source, and a signal delay device; the code wheel comprises a first area for transmitting the light beam and a second area for reflecting the light beam; the synchronous signal source is respectively connected with the first laser and the driving device and is used for providing a synchronous signal, controlling the laser pulse emission of the first laser and driving the driving device to rotate; the signal delayer is respectively connected with the synchronous signal source and the second laser and is used for delaying the synchronous signal for a period of time; the code disc is arranged on the driving device, and the laser pulse of the first laser and the laser pulse of the second laser are respectively projected at the corresponding positions of the front side and the back side of the code disc; when the laser device works, the driving device drives the code disc to rotate, so that the laser pulse of the first laser is transmitted by the first area, the laser pulse of the second laser is reflected by the second area, and the reflected light beam and the transmitted light beam are combined into one beam.
In other words, the transmission light beam and the reflection light beam on the code disc are combined into one beam, the influence of factors such as polarization state, phase and wavelength is avoided in the process, the coupling into the optical fiber is not needed, and meanwhile, the influence of the power and energy of laser is less, so that the requirements of incoherent beam combination on application occasions are lower, and the efficiency of laser beam combination is improved.
Those skilled in the art will appreciate that the following implementations are merely illustrative and not an exhaustive list, and that a person skilled in the art may substitute, splice or combine certain features or certain examples based on these implementations, which are still considered as the disclosure of the present application.
Fig. 1 is a schematic diagram of a pulse laser beam combining device according to an embodiment of the present application, where the pulse laser beam combining device includes a code wheel 50, a driving device 40, a synchronization signal source 20, and a signal delay 30.
Specifically, the code wheel 50 is disposed on the driving device 40, that is, when the driving device 40 works, the driving device 40 can drive the code wheel 50 to rotate. In the present embodiment, the driving device 40 may employ a motor.
As shown in fig. 2, the code wheel 50 is schematically shown, and in this embodiment, the code wheel 50 is a circular disk. The code disc 50 is arranged into a circular disc structure, on one hand, from the processing point of view, the code disc of the circular disc has low processing requirements, is convenient to process and is easy to manufacture; on the other hand, in order to maintain the balance of the code wheel 50, the balance of the code wheel 50 on the driving device 40 can be better ensured by arranging the code wheel 50 as a circular disk.
Wherein the code wheel 50 comprises a first area 501 for transmitting a light beam and a second area 502 for reflecting a light beam.
Specifically, the first areas 501 and the second areas 502 are alternately arranged circumferentially around the rotation axis of the code wheel 50 at the same distance from the center. As shown in fig. 2, in the embodiment of the present application, the number of the first areas 501 and the number of the second areas 502 on the code wheel 50 are set to 5, and the first areas 501 and the second areas 502 are alternately arranged on the code wheel 50, which is to rotate by the code wheel 50, and the transmitted light pulses on the first areas 501 are passed in a first period, and the delayed reflected light pulses are reflected by the second areas 502 in a second period, so that the two are combined.
In this embodiment, specific requirements are not made on the specific number of the first area 501 and the second area 502 on the code wheel 50, and the setting may be performed according to specific actual working conditions. The first region 501 and the second region 502 may be processed by cutting, etc., and such processing techniques are well established, and will not be described in detail herein.
In the embodiment of the present application, the first region 501 is a region through which the transmitted light beam is transmitted; the second region 502 is the region reflected by the reflected light beam. Specifically, the entire code wheel 50 may be made of an opaque material, and the transmission area may be a transmission hole formed by an opening provided in the code wheel 50, that is, after the transmitted light beam reaches the first area 501 (that is, the transmission area) on the code wheel 50, the transmitted light beam is emitted from the transmission hole on the first area 501 (that is, the transmission area).
The transmission hole may be a rectangular hole, a circular hole, or a fan-shaped hole, that is, the specific structure of the transmission hole may be selected according to the actual working environment.
The non-transmissive areas of the areas adjacent the transmissive holes on the code wheel 50 constitute second areas 502 (i.e., reflective areas). The second region 502 (i.e., the reflective region) may be formed by utilizing the reflective capability of the material of the code wheel 50 itself, or by providing a reflective film on a portion of the second region 502. The reflective surface of the second area 502 is provided with a reflective film, and when the reflected light beam reaches the second area 502 on the code wheel 50, the reflected light beam is reflected by the reflective film on the surface of the second area 502, so that the reflected light beam reaching the second area 502 on the code wheel 50 is reflected. To enhance the reflectivity, a reflection enhancing mode may also be provided on the surface of the second region 502 to enhance the reflectivity of the reflected beam.
Of course, the code wheel 50 may be made of a transparent material, and the second area 502 is coated with a reflective material, so as to retain the light transmitting capability of the first area 501, and the first area 501 may be coated with an anti-reflection film, which is not further discussed herein.
The above-described transmitted beam and reflected beam are generated by the laser pulse of the first laser 11 and the laser pulse of the second laser 12, respectively.
Specifically, the laser pulse of the first laser 11 and the laser pulse of the second laser 12 are respectively projected at corresponding positions on the front and back sides of the code wheel 50.
As shown in fig. 1, when the code wheel of the circular disc is installed, i.e., the code wheel 50 is installed on the driving device 40 in the vertical direction, both the front and rear sides of the code wheel 50 are exposed. In the embodiment of the present application, the laser pulse of the first laser 11 and the laser pulse of the second laser 12 are respectively projected on the front and back sides of the code wheel 50 through the optical path setting, that is, the laser pulse of the first laser 11 is projected on the front side of the code wheel 50 (in the embodiment of the present application, the front side may be any surface of the code wheel 50, and the surface opposite to the surface is the back side), and the laser pulse of the second laser 12 is projected on the second position corresponding to the first position on the back side of the code wheel 50; it will be appreciated that if the code wheel 50 is removed, the first laser beam and the second laser beam intersect, the code wheel 50 is disposed at the position where the two laser beams intersect, and the reflected beam of the second laser beam passing through the code wheel 50 propagates with the optical path of the first laser beam of the code wheel 50.
The connection relationship and the operation principle between the first laser 11 and the second laser 12 and the synchronization signal source 20 and the signal delay 30 will be described in detail.
In operation, the driving device 40 drives the code wheel 50 to rotate, so that the laser pulse of the first laser 11 is transmitted by the first region 501, the laser pulse of the second laser 12 is reflected by the second region 502, and the reflected light beam and the transmitted light beam are combined into one beam.
Specifically, the synchronization signal source 20 is connected to the first laser 11 and the driving device 40, and the synchronization signal source 20 is configured to provide a synchronization signal, where the synchronization signal may control the laser pulse emission of the first laser 11 and drive the rotation of the driving device 40.
That is, after the synchronization signal source 20 receives the signal sending instruction, a synchronization signal is sent, where the synchronization signal controls the first laser 11 and the driving device 40, that is, the synchronization signal controls the laser pulse of the first laser 11 to be emitted, and drives the driving device 40 to synchronously rotate, so that the laser pulse sent by the first laser 11 just passes through the transmission area of the code disc 50.
In addition, a signal delay 30 is connected to the synchronization signal source 20 and the second laser 12, respectively, for delaying the synchronization signal for a period of time. In addition to controlling the emission of the laser pulses by the first laser 11, the synchronization signal is provided by the synchronization signal source 20, which also controls the emission of the laser pulses by the second laser 12, but which does not directly control the emission of the laser pulses by the second laser 12 onto the code wheel 50, it is necessary to delay the emission of the laser pulses by the second laser 12 for a period of time by the signal delay 30 and to reach the code wheel 50, i.e. the signal delay delays the synchronization signal sent to the second laser 12 for a period of time, i.e. for a half of the pulse period of the second laser 12. That is, the second laser 12 emits a laser pulse between two laser pulses of the first laser 11.
Specifically, as shown in fig. 3, in the transmission operation state, the laser pulse emitted from the first laser 11 is emitted through the transmission hole of the first region 501 (i.e., the transmission region) on the code wheel 50; at this time, the laser pulse of the second laser 12 is affected by the signal delay 30, so that the laser pulse emitted by the second laser does not reach the second area 502 (i.e., the reflective area) on the code wheel 50.
As shown in fig. 4, in the reflective operation state, the laser pulse of the second laser 12 passes through the signal delayer 30, and delays the laser pulse emitted by the second laser 12 by one half of its period, at this time, the laser pulse emitted by the second laser 12 is just reflected to the second area 502 (i.e. the reflective area) of the code wheel 50 and is reflected. At this time, however, the laser pulse emitted by the first laser 11 has not yet reached the first region 501 of the code wheel 50. That is, only one laser pulse reaches the code wheel 50, either in the transmissive or reflective mode of operation.
Next, a case where the laser pulse of the first laser 11 and the laser pulse of the second laser 12 are coupled will be described.
When the laser device works, the synchronous signal source 20 sends out pulse signals, the driving device 40 drives the code wheel 50 to rotate, and the first laser 11 and the second laser 12 can also send out own laser pulses at the moment, but due to the combination of the laser pulses of the second laser 12 and the action of the signal delay 30, the laser pulses of the first laser 11 and the laser pulses of the second laser 12 are staggered for a period of time, so that when the laser pulses of the first laser 11 reach the code wheel 50, the laser pulses can just pass through the first area 501 (namely pass through the transmission area); the laser pulses of the second laser 12, when they reach the code wheel 50, are just reflected 502 by the second area on the code wheel 50 (i.e., the reflection area), so that the two laser pulses are combined into one beam by the code wheel 50.
The laser pulse of the first laser 11 is transmitted by the first region 501, the laser pulse of the second laser 12 is reflected by the second region 502, the reflected beam and the transmitted beam are combined into one beam, and the intersection point of the two beams is on the second region 502 (i.e., the reflection region) on the code wheel 50, so that the reflected beam and the transmitted beam are combined into one beam, i.e., the beams output from the code wheel 50 are just overlapped.
When the driving device 40 controls the code wheel 50 to rotate, the rotation speed of the code wheel 50 is controlled by factors such as the frequency of laser pulses of the first laser 11 and the second laser 12, the first area 501 and the second area 502 on the code wheel 50, and the like.
For example, taking the example that the pulse frequencies of the two lasers are the same, that is, the pulse frequencies of the first laser 11 and the second laser 12 are f, and the number of the first region 501 and the second region 502 is N (N > =1), the following is satisfied: k=n=f;
where k is the rotational speed of the drive 40.
As shown in fig. 5, the frequency of the first laser 11 and the second laser 12 is 1000Hz, the pulse width is 10ns, the beam diameter is 1mm, and the number N of the first area 501 and the second area 502 on the code wheel 50 is 50, and the rotation speed k of the code wheel 50 is 20 rpm according to the above relation of k×n=f.
The code wheel 50 is designed as shown in fig. 5, the diameter of the code wheel 50 is 100mm, the diameter of a central hole of the code wheel 50 is 10mm, the edge of the code wheel 50 is a region between the first region 501 and the second region 502, and the size of the light transmitting region of the code wheel 50 can meet the requirement that the beam diameter is 1 mm.
The above description of the code wheel 50, the driving means 40 and the first and second lasers 11, 12 by way of specific example illustrates the requirements for the beam diameter through the code wheel 50.
The embodiment of the application further provides a code wheel 50, the code wheel 50 is used for the pulse laser beam combining device, the code wheel 50 is a circular disc, a light transmission area and a reflection area are periodically arranged along the circumference of the circular disc, the number of the light transmission area and the number of the reflection area are the same, and a mounting hole for being assembled on a driving shaft of the driving device 40 is arranged in the center of the disc.
The specific structure and connection manner of the code wheel can refer to the code wheel in the pulse laser beam combining device, and will not be described in detail.
While the preferred embodiment has been described, it is not intended to limit the utility model thereto, and any person skilled in the art may make variations and modifications without departing from the spirit and scope of the present utility model, so that the scope of the present utility model shall be defined by the claims of the present application.
Claims (9)
1. A pulsed laser beam combining device, comprising: the device comprises a code disc, a driving device, a synchronous signal source and a signal delay device;
the code wheel comprises a first area for transmitting light beams and a second area for reflecting light beams;
the synchronous signal source is respectively connected with the first laser and the driving device and is used for providing a synchronous signal, controlling the laser pulse emission of the first laser and driving the driving device to rotate;
the signal delayer is respectively connected with the synchronous signal source and the second laser and is used for delaying the synchronous signal for a period of time;
the code disc is arranged on the driving device, and the laser pulse of the first laser and the laser pulse of the second laser are respectively projected at the corresponding positions of the front side and the back side of the code disc;
when the laser device works, the driving device drives the code wheel to rotate, so that laser pulses of the first laser are transmitted by the first area, laser pulses of the second laser are reflected by the second area, and the reflected light beam and the transmitted light beam are combined into one beam.
2. The pulsed laser beam combining device according to claim 1, wherein first regions and second regions are alternately arranged circumferentially around the rotation axis of the code wheel at the same distance from the rotation axis to the center.
3. The pulsed laser beam combining device of claim 1, wherein the code wheel is a circular disc.
4. A pulsed laser beam combining device as claimed in claim 2 or 3, wherein the transmissive region is a transmissive aperture provided in the code wheel.
5. The pulsed laser beam combining device of claim 4, wherein the transmissive aperture is a rectangular aperture, a circular aperture, or a fan aperture.
6. The pulsed laser beam combining device of claim 2, wherein a reflective film is provided on the second area reflective surface.
7. The pulsed laser beam combining device of any of claims 2, 3, 5, or 6, wherein the first and second lasers have a pulse frequency f and the number of first and second regions is N (N > = 1), then:
k*N＝f；
where k is the rotational speed of the drive.
8. The pulsed laser beam combining device of claim 1, wherein the signal delay delays the synchronization signal for a period of time that is one-half of a delay laser pulse period.
9. The code disc is characterized in that the code disc is a circular disc, a light transmission area and a reflection area are periodically arranged along the circumference of the code disc, the number of the light transmission area and the number of the reflection area are the same, and a mounting hole for being assembled on a driving shaft of a driving device is formed in the center of the disc.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223422981.8U CN219143208U (en) | 2022-12-16 | 2022-12-16 | Pulsed laser beam combining device and code disc |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223422981.8U CN219143208U (en) | 2022-12-16 | 2022-12-16 | Pulsed laser beam combining device and code disc |
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| CN219143208U true CN219143208U (en) | 2023-06-06 |
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| CN202223422981.8U Active CN219143208U (en) | 2022-12-16 | 2022-12-16 | Pulsed laser beam combining device and code disc |
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