CN117578168A - High-power picosecond fiber laser generating device and method for flat-top light spots - Google Patents
High-power picosecond fiber laser generating device and method for flat-top light spots Download PDFInfo
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- CN117578168A CN117578168A CN202311859346.2A CN202311859346A CN117578168A CN 117578168 A CN117578168 A CN 117578168A CN 202311859346 A CN202311859346 A CN 202311859346A CN 117578168 A CN117578168 A CN 117578168A
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- laser
- amplifying
- beam splitting
- fiber
- power
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- 239000000835 fiber Substances 0.000 title claims abstract description 32
- 241001270131 Agaricus moelleri Species 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000013307 optical fiber Substances 0.000 claims abstract description 25
- 238000009826 distribution Methods 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 9
- 230000003321 amplification Effects 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000000265 homogenisation Methods 0.000 abstract description 2
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 2
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009022 nonlinear effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
- H01S3/06758—Tandem amplifiers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
- H01S3/2308—Amplifier arrangements, e.g. MOPA
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
- H01S3/2383—Parallel arrangements
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
The application discloses a high-power picosecond fiber laser generating device and method for flat-top light spots, and belongs to the field of lasers. Comprising the following steps: the laser emission part is used for forming a plurality of beam splitting laser paths with approximately equal power; the beam combining piece is used for combining a plurality of beam splitting laser light paths into a beam combining laser light path with uniform energy distribution, and the beam combining laser light path can form flat-top light spots on the surface of a material to be cut. The laser energy gain method has the beneficial effects that in the laser energy gain process, only large-mode-field few-mode optical fiber is adopted for amplification, so that good laser performance is ensured. The total output power of the laser is improved by a beam combining method; in the laser beam combiner, multimode optical fibers generate homogenization on input laser, and the fundamental mode Gaussian light spots with unevenly distributed energy are converted into flat-top circular light spots or square light spots with even distribution, so that the application is convenient.
Description
Technical Field
The application relates to the field of lasers, in particular to a high-power picosecond fiber laser generating device with flat-top light spots.
Background
The picosecond fiber laser has unique advantages when applied to laser processing, has smaller heat affected zone and higher peak power, and can be applied to the aspects of laser cutting, laser cleaning, laser material modification and the like of metal nonmetallic materials. Such applications typically require higher laser power to increase processing efficiency, and a uniform spatial distribution of spot energy to increase consistency of laser processing. Currently, conventional picosecond fiber lasers are limited by nonlinear effects, typically with low output power. And because of the waveguide characteristic of the optical fiber, the energy of the middle part of the Gaussian beam of the fundamental mode is higher, the energy of the edge part is lower, and the uneven energy distribution causes the processing difficulty of the processing object needing surface splicing.
Disclosure of Invention
The content of the present application is intended to introduce concepts in a simplified form that are further described below in the detailed description. The section of this application is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.
In order to solve the technical problems mentioned in the background section above,
a first object of the present invention is to provide a high power picosecond fiber laser generating device with flat-top light spots, comprising: the laser emission part is used for forming a plurality of beam splitting laser paths with approximately equal power; the beam combining piece is used for combining a plurality of beam splitting laser light paths into a beam combining laser light path with uniform energy distribution, and the beam combining laser light path can form flat-top light spots on the surface of a material to be cut.
Further, the output optical fiber of the beam combining member may be a square core optical fiber.
Further, the output optical fiber of the beam combining piece is a square fiber core optical fiber with 200 micrometer side length.
Further, the laser also comprises a plurality of groups of laser amplifying pieces; the multiple groups of laser amplifying pieces are used for amplifying the power of the multiple beam splitting laser paths so that the multiple beam splitting laser paths are combined through the beam combining pieces after being amplified.
Further, the laser amplifying member includes a plurality of amplifying elements; the multiple beam splitting laser paths sequentially pass through the amplifying elements to amplify the power to 500W.
Further, the plurality of amplifying elements is 3; a first amplifying element, a second amplifying element and a third amplifying element respectively; the first amplifying element is used for amplifying the power of the beam splitting laser light path to 1W; the second amplifying element is used for amplifying the power of the beam splitting laser light path to 15W; the third amplifying element is used for amplifying the power of the beam splitting laser light path to 500W.
Further, the output optical fiber of the third amplifying element is a double-clad optical fiber with a core diameter of 30 micrometers.
Further, the laser emitting member includes: a picosecond laser seed source and a spectroscopic element; the picosecond laser seed source is used for outputting an initial laser light path, and the initial laser light path passes through the beam splitting element to form a plurality of beam splitting laser light paths with approximately equal power.
Further, the pulse width of the initial laser path output by the picosecond laser seed source is 50ps, and the power is 500mW.
Another object of the present invention is to provide a method for generating laser light using a high power picosecond fiber laser light generating device with a flat-top spot, comprising the steps of:
forming a plurality of beam splitting laser paths with approximately equal power through the laser emitting piece;
combining a plurality of beam splitting laser light paths into a beam combining laser light path with uniform energy distribution through a beam combining piece; and the beam combining laser path can form a flat-top light spot on the surface of the material to be cut.
The beneficial effects of this application lie in:
in the laser energy gain process, only large-mode-field few-mode optical fiber amplification is adopted, so that good laser performance is ensured. The total power of laser output is improved by a beam combining method.
In the laser beam combiner, multimode optical fibers generate homogenization on input laser, and the fundamental mode Gaussian light spots with unevenly distributed energy are converted into flat-top circular light spots or square light spots with even distribution, so that the application is convenient.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the application and to provide a further understanding of the application with regard to the other features, objects and advantages of the application. The drawings of the illustrative embodiments of the present application and their descriptions are for the purpose of illustrating the present application and are not to be construed as unduly limiting the present application.
In addition, the same or similar reference numerals denote the same or similar elements throughout the drawings. It should be understood that the figures are schematic and that elements and components are not necessarily drawn to scale.
In the drawings:
fig. 1 is an overall schematic diagram according to an embodiment of the present application.
Detailed Description
Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It should be understood that the drawings and embodiments of the present disclosure are for illustration purposes only and are not intended to limit the scope of the present disclosure.
It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings. Embodiments of the present disclosure and features of embodiments may be combined with each other without conflict.
It should be noted that the terms "first," "second," and the like in this disclosure are merely used to distinguish between different devices, modules, or units and are not used to define an order or interdependence of functions performed by the devices, modules, or units.
It should be noted that references to "one", "a plurality" and "a plurality" in this disclosure are intended to be illustrative rather than limiting, and those of ordinary skill in the art will appreciate that "one or more" is intended to be understood as "one or more" unless the context clearly indicates otherwise.
The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
With reference to figure 1 of the drawings,
a high power picosecond fiber laser generating device for flat-top speckle, comprising: the laser emission part is used for forming a plurality of beam splitting laser paths with approximately equal power. The end point of the beam splitting laser light path is provided with a beam combining piece, the beam combining piece is used for combining a plurality of beam splitting laser light paths into a beam combining laser light path with uniform energy distribution, and the beam combining laser light path can form a flat-top light spot on the surface of a material to be cut. Specifically, the multiple beam splitting laser paths with approximately equal power are 8.
Specifically, the output optical fiber of the beam combining piece may be a square fiber core optical fiber, and a flat-top light spot in the direction can be output at this time, and in some modes, other fiber core optical fibers in other shapes may be adopted to output a circular flat-top light spot outwards.
Specifically, the output optical fiber of the beam combining piece is a square fiber core optical fiber with 200 microns side length. The input fiber was an 8-channel 105 micron core multimode fiber with each port fiber length of 20 cm.
Specifically, the laser also comprises a plurality of groups of laser amplifying pieces; the multiple groups of laser amplifying pieces are used for amplifying the power of the multiple beam splitting laser paths so that the multiple beam splitting laser paths are combined through the beam combining pieces after being amplified.
Specifically, the laser amplifying element includes a plurality of amplifying elements; the multiple beam splitting laser paths sequentially pass through the amplifying elements to amplify the power to 500W.
Specifically, the plurality of amplifying elements is 3; a first amplifying element, a second amplifying element and a third amplifying element respectively; the first amplifying element is used for amplifying the power of the beam splitting laser light path to 1W; the second amplifying element is used for amplifying the power of the beam splitting laser light path to 15W; the third amplifying element is used for amplifying the power of the beam splitting laser light path to 500W. The 8 paths of multimode optical fibers with the fiber core diameter of 105 microns are connected with the end part of the laser output of the third amplifying element in an outward output mode in a fusion mode.
Specifically, the output optical fiber of the third amplifying element is a double-clad optical fiber with a fiber core diameter of 30 micrometers.
Specifically, the laser emitting member includes: a picosecond laser seed source and a spectroscopic element; the picosecond laser seed source is used for outputting an initial laser light path, and the initial laser light path passes through the beam splitting element to form a plurality of beam splitting laser light paths with approximately equal power.
Specifically, the pulse width of the initial laser path output by the picosecond laser seed source is 50ps, and the power is 500mW.
Another object of the present invention is to provide a method for generating laser light using a high power picosecond fiber laser light generating device with a flat-top spot, comprising the steps of:
forming a plurality of beam splitting laser paths with approximately equal power through the laser emitting piece;
combining a plurality of beam splitting laser light paths into a beam combining laser light path with uniform energy distribution through a beam combining piece; and the beam combining laser path can form a flat-top light spot on the surface of the material to be cut.
The foregoing description is only of the preferred embodiments of the present disclosure and description of the principles of the technology being employed. It will be appreciated by those skilled in the art that the scope of the invention in the embodiments of the present disclosure is not limited to the specific combination of the above technical features, but encompasses other technical features formed by any combination of the above technical features or their equivalents without departing from the spirit of the invention. Such as the above-described features, are mutually substituted with (but not limited to) the features having similar functions disclosed in the embodiments of the present disclosure.
Claims (10)
1. The utility model provides a high power picosecond fiber laser generating device of flat top facula which characterized in that includes:
the laser emission part is used for forming a plurality of beam splitting laser paths with approximately equal power;
the beam combining piece is used for combining a plurality of beam splitting laser light paths into a beam combining laser light path with uniform energy distribution, and the beam combining laser light path can form flat-top light spots on the surface of a material to be cut.
2. The high power picosecond fiber laser generator of flat top speckle of claim 1, wherein:
the output optical fiber of the beam combining piece can be a square fiber core optical fiber.
3. The high power picosecond fiber laser generator of flat top speckle of claim 2, wherein:
the output optical fiber of the beam combining piece is a square fiber core optical fiber with 200 microns side length.
4. The high power picosecond fiber laser generator of flat top speckle of claim 1, wherein:
the laser also comprises a plurality of groups of laser amplifying pieces;
the multiple groups of laser amplifying pieces are used for amplifying the power of the multiple beam splitting laser paths so that the multiple beam splitting laser paths are combined through the beam combining pieces after being amplified.
5. The high power picosecond fiber laser generator of flat top speckle of claim 4, wherein:
the laser amplifying piece comprises a plurality of amplifying elements;
the multiple beam splitting laser paths sequentially pass through the amplifying elements to amplify the power to 500W.
6. The high power picosecond fiber laser generator of flat top speckle of claim 5, wherein:
the plurality of amplifying elements is 3; a first amplifying element, a second amplifying element and a third amplifying element respectively;
the first amplifying element is used for amplifying the power of the beam splitting laser light path to 1W;
the second amplifying element is used for amplifying the power of the beam splitting laser light path to 15W;
the third amplifying element is used for amplifying the power of the beam splitting laser light path to 500W.
7. The high power picosecond fiber laser generator of flat top speckle of claim 6, wherein:
the output optical fiber of the third amplifying element is a double-clad optical fiber with a fiber core diameter of 30 micrometers.
8. The high power picosecond fiber laser generator of flat top speckle of claim 1, wherein:
the laser emitting member includes: a picosecond laser seed source and a spectroscopic element;
the picosecond laser seed source is used for outputting an initial laser light path, and the initial laser light path passes through the beam splitting element to form a plurality of beam splitting laser light paths with approximately equal power.
9. The high power picosecond fiber laser generator of flat top speckle of claim 8, wherein:
and the pulse width of the initial laser path output by the picosecond laser seed source is 50ps, and the power is 500mW.
10. A method of lasing a high power picosecond fiber laser generating apparatus having a flat top spot as claimed in any of claims 1 to 9, comprising the steps of:
forming a plurality of beam splitting laser paths with approximately equal power through the laser emitting piece;
combining a plurality of beam splitting laser light paths into a beam combining laser light path with uniform energy distribution through a beam combining piece; and the beam combining laser path can form a flat-top light spot on the surface of the material to be cut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311859346.2A CN117578168A (en) | 2023-12-30 | 2023-12-30 | High-power picosecond fiber laser generating device and method for flat-top light spots |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311859346.2A CN117578168A (en) | 2023-12-30 | 2023-12-30 | High-power picosecond fiber laser generating device and method for flat-top light spots |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117578168A true CN117578168A (en) | 2024-02-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311859346.2A Pending CN117578168A (en) | 2023-12-30 | 2023-12-30 | High-power picosecond fiber laser generating device and method for flat-top light spots |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117578168A (en) |
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2023
- 2023-12-30 CN CN202311859346.2A patent/CN117578168A/en active Pending
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