CN114122898A - Multimode high-power fiber laser and method for inhibiting stimulated Raman scattering effect - Google Patents
Multimode high-power fiber laser and method for inhibiting stimulated Raman scattering effect Download PDFInfo
- Publication number
- CN114122898A CN114122898A CN202111418092.1A CN202111418092A CN114122898A CN 114122898 A CN114122898 A CN 114122898A CN 202111418092 A CN202111418092 A CN 202111418092A CN 114122898 A CN114122898 A CN 114122898A
- Authority
- CN
- China
- Prior art keywords
- laser
- output
- fiber
- multimode
- module
- 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
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
- H01S3/23—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
-
- 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
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0071—Beam steering, e.g. whereby a mirror outside the cavity is present to change the beam direction
-
- 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
- H01S3/2375—Hybrid lasers
-
- 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
- H01S5/00—Semiconductor lasers
- H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
- H01S5/4012—Beam combining, e.g. by the use of fibres, gratings, polarisers, prisms
Abstract
The invention relates to a multimode high-power fiber laser and a method for inhibiting stimulated Raman scattering effect, wherein a multimode group fiber laser is formed by combining single-mode group lasers output by at least two laser wavelengths, so that the stimulated Raman effect caused in a fiber laser system can be effectively inhibited, and the power density of fiber transmission is effectively improved; the method has very important significance for laser systems, especially high-power laser application systems such as laser cutting and welding systems.
Description
Technical Field
The invention belongs to the field of high-power fiber lasers, and particularly relates to a multimode high-power fiber laser capable of inhibiting stimulated Raman scattering effect.
Background
In a high-power fiber laser system, a grating in a fiber laser cannot reflect and intercept Raman scattering light generated by a stimulated Raman scattering effect, so that the Raman scattering light can damage optical devices such as a beam combiner in the laser system, and even cause the whole fiber laser system to be burnt. In addition, in practical laser application, the laser processing material and the lens can also form unstable reflection on laser, and if the fiber laser does not well inhibit the stimulated raman scattering effect, nonlinear laser reflected into the gain cavity can form a gain competition effect, so that the fiber laser enters an unstable mode.
The stimulated raman scattering effect in high power fiber lasers is typically suppressed in the prior art by using fibers with larger core diameters. However, enlarging the core reduces the energy density of the laser transmitted in the optical fiber, but also directly reduces the energy density of the output laser; enlarging the fiber core can also cause excitation of more modes, which affects the quality of output light beams; the enlarged fiber core improves the Raman suppression ratio of the single module by reducing the power of the single module, but the beam combining module number is obviously increased to realize the output power of ten thousand watts. Furthermore, since the threshold of stimulated raman scattering is more easily reached in pulsed fiber lasers, experimental studies have been conducted in the prior art mainly for pulsed fiber lasers, while less studies have been made on the stimulated raman effect in high power continuous fiber lasers. Therefore, how to suppress the stimulated raman scattering effect in the high-power continuous fiber laser is still an urgent technical problem to be solved in the high-power laser.
Disclosure of Invention
In order to solve the problems, the invention provides a multimode high-power optical fiber laser capable of inhibiting the stimulated raman scattering effect and a method for inhibiting the stimulated raman scattering effect.
The invention provides a multimode high-power optical fiber laser which comprises at least two groups of single-mode laser modules with different output wavelengths, a laser beam combining module and a multimode optical fiber output optical cable, wherein the laser beam combining module combines output lasers of the at least two groups of single-mode laser modules with different output wavelengths and inputs the combined output lasers into the multimode optical fiber output optical cable, the intensity of stimulated Raman photons generated by any one group of single-mode laser modules in the at least two groups of single-mode laser modules with different output wavelengths after linear superposition is smaller than the amplification threshold value of the stimulated Raman scattering effect of the multimode optical fiber output optical cable, and the output light of the multimode high-power optical fiber laser is continuous light in a ten-kilowatt level.
In one embodiment, the difference between the output wavelengths of any two of the at least two single-mode laser modules having different output wavelengths is between 10nm and 50 nm.
In one embodiment, at least two groups of single-mode laser modules with different output wavelengths comprise 3 single-mode laser modules with 1070nm output wavelengths and 4 single-mode laser modules with 1080nm output wavelengths.
In one embodiment, at least two groups of single-mode laser modules with different output wavelengths comprise 4 single-mode laser modules with 1070nm output wavelengths and 3 single-mode laser modules with 1080nm output wavelengths.
In one embodiment, the laser used by the single mode set laser module is a fiber laser, a solid state laser, or a semiconductor laser.
In one embodiment, the laser used by the single-mode fiber laser module is a fiber laser, the fiber laser at least comprises a coupling-out grating, a gain fiber and a pump diode, and the output wavelength of the single-mode fiber laser module is determined by the reflection frequency band of the coupling-out grating.
In one embodiment, the laser beam combining module includes one or more laser beam combiners, and the laser beam combining module combines the plurality of single module laser modules in a one-stage beam combining manner or a multi-stage beam combining manner.
In one embodiment, the laser beam combining module comprises a fiber coupler and a plurality of single-mode fibers, or comprises a plurality of collimating lenses and at least one focusing lens.
The invention also provides a system for applying the multimode high-power optical fiber laser to laser welding or laser cutting.
The invention also provides a method for inhibiting the stimulated Raman scattering effect in the multimode high-power optical fiber laser, which is characterized in that a laser beam combining module is adopted to combine the output lasers of at least two groups of single-module laser modules with different output wavelengths in the multimode high-power optical fiber laser and then input the combined output lasers into the multimode optical fiber output optical cable, wherein the intensity of the linearly superposed stimulated Raman photons generated by any one group of single-module laser modules in the at least two groups of single-module laser modules with different output wavelengths is smaller than the amplification threshold value of the stimulated Raman scattering effect of the multimode optical fiber output optical cable.
The invention has at least the following beneficial technical effects:
(1) the invention selects the single-mode lasers with at least two different laser wavelengths to carry out beam combination, effectively inhibits the stimulated Raman effect in the multimode high-power laser and improves the power density of optical fiber transmission.
(2) The invention effectively inhibits the stimulated Raman effect in the multimode high-power laser, does not influence the energy density of the output laser on the basis of not increasing the total number of single-mode laser modules for beam combination, and can continuously and stably output continuous light of ten-kilowatt level.
(3) The multimode high-power optical fiber laser has the advantages of simple structure and low cost, and has very important significance for high-power laser application systems, such as laser cutting and welding systems, and the like, and the application with high power density requirement.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a multimode high power fiber laser of the present invention.
Fig. 2(a) shows the output spectrum of the laser when only the 1070nm wavelength single mode fiber laser module is used, and fig. 2(b) shows the output spectrum of the laser when both the 1070nm and 1080nm wavelength single mode fiber laser modules are used.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a multimode high-power fiber laser and a method for inhibiting stimulated Raman scattering effect, the multimode high-power fiber laser comprises at least two groups of single-mode laser modules with different output wavelengths, a laser beam combining module and a multimode fiber output optical cable, the laser beam combining module combines output lasers of the at least two groups of single-mode laser modules with different output wavelengths and inputs the combined output lasers into the multimode fiber output optical cable, and the intensity of the linearly superposed stimulated Raman photons generated by any one group of single-mode laser modules in the at least two groups of single-mode laser modules with different output wavelengths is smaller than the amplification threshold value of the stimulated Raman scattering effect of the multimode fiber output optical cable. The output light of the single-module laser module is continuous light with the output power of at least 2000W, and the multimode high-power fiber laser can continuously and stably output the ten-kilowatt-level continuous light.
The difference value between the output wavelengths of any two groups of single-module laser modules in at least two groups of single-module laser modules with different output wavelengths is 10nm to 50 nm.
Wherein, the different single module laser module of at least two sets of output wavelength can include that 3 output wavelength are 1070 nm's single mode group laser module and 4 output wavelength are 1080 nm's single mode group laser module.
Wherein, the different single module laser module of at least two sets of output wavelength can include 4 output wavelength be 1070 nm's single mode group laser module and 3 output wavelength be 1080 nm's single mode group laser module.
According to the stimulated Raman scattering threshold value of the laser system, any number of single-module laser modules can be adopted for combination, and other single-module laser modules with output wavelengths can also be adopted.
The laser adopted by the single-mode laser module can be a fiber laser, a solid laser, a semiconductor laser or other lasers. The laser beam combining module comprises one or more laser beam combiners, and a plurality of single module laser modules are combined in a one-stage beam combining or multi-stage beam combining mode.
The laser beam combining module may adopt a mode of fiber coupling and fiber transmission output, and the laser beam combining module includes a fiber coupler and a plurality of single-mode fibers. The laser beam combining module may also adopt a spatial coupling spatial transmission mode, and then the laser beam combining module includes a plurality of collimating lenses and at least one focusing lens. The above two beam combining methods are common knowledge in the art, and the detailed structure is not described again.
The multimode fiber output optical cable can be a multimode or few-mode fiber with a core larger than or equal to 50 um.
Example 1
The multimode high-power fiber laser shown in fig. 1 comprises three 3000W single-mode fiber laser modules 1 with 1070nm wavelength output, four 3000W single-mode fiber laser modules 2 with 1080nm wavelength output, a laser beam combiner 3 and a multimode fiber output optical cable 4, wherein the laser beam combiner 3 couples output lasers of the three single-mode fiber laser modules 1 and the four single-mode fiber laser modules 2 into the multimode fiber output optical cable in a fiber beam combining manner.
The single-mode fiber laser module is a fiber laser and at least comprises a coupling output grating, a gain fiber and a pumping diode. The output wavelength of the single-module fiber laser module is determined by the reflection frequency band of the coupling output grating, the coupling output grating in the 3000W single-module fiber laser module 1 with 1070nm wavelength output is 1070nm grating, and the coupling output grating in the 3000W single-module fiber laser module 2 with 1080nm wavelength output is 1080nm grating.
The principle of the invention for inhibiting the stimulated Raman scattering effect in the multimode high-power optical fiber laser is as follows:
the wavelength formed by the stimulated raman scattering effect in the optical fiber is characterized by a fixed wavelength difference with the wavelength of the incident laser. When the 1070nm wavelength single-mode fiber laser module 1 outputs, stimulated raman photons with a wavelength of 1125nm are generated, if the wavelengths of the seven single-mode fiber laser modules are 1070nm and are coupled by the laser beam combiner 3 and then output by the multimode output optical cable 4, the 1125 wavelength stimulated raman photons generated by each 1070nm single-mode fiber laser module form a linear superposition effect after being combined, when the linear superposition effect reaches an amplification threshold of the stimulated raman scattering effect of the multimode fiber laser system, the 1125 wavelength stimulated raman photons generate a nonlinear superposition effect, namely a stimulated amplification effect, and the raman light is exponentially increased, as shown in fig. 2 (a).
If three 1070nm wavelength single-mode fiber laser modules 1 are selected, and four 1080nm wavelength single-mode fiber laser modules 2 are selected, two single-mode fiber lasers with different output wavelengths respectively generate stimulated Raman photons with wavelengths of 1125nm and 1135nm, in the whole multimode fiber system, the excited Raman photons with the wavelength of 1125nm only come from the linear superposition effect output by the three 1070nm single-mode fiber laser modules 1, the stimulated Raman photons with the wavelength of 1135nm only come from the linear superposition effect output by the four 1080nm single-mode-group fiber laser modules 2, the mode superposition cannot be formed between the stimulated Raman photons with two different wavelengths of 1125nm and 1135nm, therefore, the two stimulated Raman effect photon quantities can be inhibited within the amplification threshold of the stimulated Raman scattering effect, the stimulated Raman photons can not generate the nonlinear superposition effect, therefore, the purpose of inhibiting the stimulated Raman scattering effect of the whole multimode high-power fiber laser system is achieved.
As shown in fig. 2(b), when three 1070nm wavelength single-mode fiber laser modules 1 and four 1080nm wavelength single-mode fiber laser modules 2 are selected, the stimulated raman photons of 1125nm and 1135nm wavelength are effectively suppressed. The multimode high-power optical fiber laser meets the requirement of industrial processing and can continuously and stably output 1070nm and 1080nm continuous light for at least 24 hours.
Example 2
In the multimode high power fiber laser, including the 3000W single mode group fiber laser module 1 of four 1070nm wavelength outputs, the 3000W single mode group fiber laser module 2 of three 1080nm wavelength outputs, laser beam combiner 3 and multimode fiber output optical cable 4, laser beam combiner 3 couples the output laser of four single mode group fiber laser modules 1 and three single mode group fiber laser modules 2 to multimode fiber output optical cable through the mode of fiber beam combination.
Example 3
The multimode high-power optical fiber laser comprises 2 3000W single-mode-group optical fiber laser modules with 1064nm wavelength output, 2 3000W single-mode-group optical fiber laser modules with 1084nm wavelength output, a laser beam combiner and a multimode optical fiber output optical cable, wherein the laser beam combiner couples output laser of the 4 single-mode-group optical fiber laser modules into the multimode optical fiber output optical cable in an optical fiber beam combining mode.
Example 4
The multimode high-power optical fiber laser comprises 2 3000W single-mode group optical fiber laser modules with 1055nm wavelength output, 2 3000W single-mode group optical fiber laser modules with 1070nm wavelength output, 3 3000W single-mode group optical fiber laser modules with 1085nm wavelength output, a laser beam combiner and a multimode optical fiber output optical cable, wherein the laser beam combiner couples 7 single-mode group optical fiber laser modules into the multimode optical fiber output optical cable in an optical fiber beam combining mode.
The multimode high-power fiber laser provided by the invention effectively inhibits the stimulated Raman effect in the multimode high-power fiber laser on the basis of not increasing the total number of single-mode laser modules for beam combination and not influencing the energy density of output laser. The multimode high-power optical fiber laser has simple structure and low cost, and has very important significance for high-power laser application systems, such as laser cutting and welding systems.
Although illustrative embodiments of the present invention have been described above to facilitate the understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, and various changes may be made apparent to those skilled in the art as long as they are within the spirit and scope of the present invention as defined and defined by the appended claims, and all matters of the invention which utilize the inventive concepts are protected.
Claims (10)
1. The multimode high-power optical fiber laser is characterized by comprising at least two groups of single-mode laser modules with different output wavelengths, a laser beam combining module and a multimode optical fiber output optical cable, wherein the laser beam combining module combines output lasers of the at least two groups of single-mode laser modules with different output wavelengths and inputs the combined output lasers into the multimode optical fiber output optical cable, the intensity of stimulated Raman photons generated by any one group of single-mode laser modules with different output wavelengths after linear superposition is smaller than the amplification threshold value of the stimulated Raman scattering effect of the multimode optical fiber output optical cable, and the output light of the multimode high-power optical fiber laser is continuous light in a ten-kilowatt level.
2. A multimode high power fiber laser as claimed in claim 1, wherein the difference between the output wavelengths of any two single module laser modules of said at least two single module laser modules with different output wavelengths is between 10nm and 50 nm.
3. A multimode high power fiber laser as claimed in claim 1, wherein said at least two sets of single mode laser modules with different output wavelengths comprise 3 single mode laser modules with 1070nm output wavelength and 4 single mode laser modules with 1080nm output wavelength.
4. A multimode high power fiber laser as claimed in claim 1, wherein said at least two sets of single mode laser modules with different output wavelengths comprise 4 single mode laser modules with 1070nm output wavelength and 3 single mode laser modules with 1080nm output wavelength.
5. A multimode high power fiber laser as claimed in claim 1, wherein the laser employed by the single module laser module is a fiber laser, a solid state laser or a semiconductor laser.
6. The multimode high power fiber laser as claimed in claim 1, wherein the laser adopted by the single module laser module is a fiber laser, the fiber laser at least comprises a coupling-out grating, a gain fiber and a pump diode, and the output wavelength of the single module fiber laser module is determined by the reflection frequency band of the coupling-out grating.
7. The multimode high power fiber laser of claim 1, wherein the laser beam combining module comprises one or more laser beam combiners, and the laser beam combining module combines a plurality of single module laser modules in a one-stage beam combining manner or a multi-stage beam combining manner.
8. The multimode high power fiber laser of claim 1, wherein the laser beam combining module comprises a fiber coupler and a plurality of single mode fibers, or comprises a plurality of collimating lenses and at least one focusing lens.
9. Use of a multimode high power fiber laser according to claims 1-8 in a laser welding or laser cutting system.
10. A method for suppressing the stimulated raman scattering effect in a multimode high-power fiber laser as defined in claims 1-8, characterized in that the laser beam combining module is used to combine the output laser beams of at least two groups of single module laser modules with different output wavelengths in the multimode high-power fiber laser and input the combined laser beams into the multimode fiber output cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111418092.1A CN114122898A (en) | 2021-11-25 | 2021-11-25 | Multimode high-power fiber laser and method for inhibiting stimulated Raman scattering effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111418092.1A CN114122898A (en) | 2021-11-25 | 2021-11-25 | Multimode high-power fiber laser and method for inhibiting stimulated Raman scattering effect |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114122898A true CN114122898A (en) | 2022-03-01 |
Family
ID=80369577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111418092.1A Pending CN114122898A (en) | 2021-11-25 | 2021-11-25 | Multimode high-power fiber laser and method for inhibiting stimulated Raman scattering effect |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114122898A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104201546A (en) * | 2014-09-01 | 2014-12-10 | 天津光拓伟业科技有限公司 | Fiber laser system with narrow-line-width and high-peak power pulse output |
| CN109193337A (en) * | 2018-10-29 | 2019-01-11 | 中国人民解放军国防科技大学 | Stimulated Raman scattering inhibition method for high-power optical fiber laser amplifier system |
| CN112003116A (en) * | 2020-08-24 | 2020-11-27 | 中国科学院上海光学精密机械研究所 | Ultrashort pulse Raman fiber amplifier |
| CN112688152A (en) * | 2020-12-29 | 2021-04-20 | 深圳市大族光子激光技术有限公司 | Optical fiber oscillator and optical fiber laser |
-
2021
- 2021-11-25 CN CN202111418092.1A patent/CN114122898A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104201546A (en) * | 2014-09-01 | 2014-12-10 | 天津光拓伟业科技有限公司 | Fiber laser system with narrow-line-width and high-peak power pulse output |
| CN109193337A (en) * | 2018-10-29 | 2019-01-11 | 中国人民解放军国防科技大学 | Stimulated Raman scattering inhibition method for high-power optical fiber laser amplifier system |
| CN112003116A (en) * | 2020-08-24 | 2020-11-27 | 中国科学院上海光学精密机械研究所 | Ultrashort pulse Raman fiber amplifier |
| CN112688152A (en) * | 2020-12-29 | 2021-04-20 | 深圳市大族光子激光技术有限公司 | Optical fiber oscillator and optical fiber laser |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7508574B2 (en) | Apparatus for providing optical radiation | |
| US8351113B2 (en) | High power fiber laser system | |
| CN212810845U (en) | High power fiber laser amplifier system | |
| US4551684A (en) | Noise reduction in laser amplifiers | |
| KR20140068795A (en) | Broadband light source | |
| US7502391B2 (en) | Eye safe high power fibre laser | |
| JP2002006348A (en) | Optical amplifier | |
| CN212935129U (en) | Fusion point-free optical fiber laser | |
| CN111817119B (en) | Fiber laser with fiber core Raman return light resisting function | |
| CN212935127U (en) | Laser device | |
| US8004753B2 (en) | Optical amplifier, fiber laser, and method of eliminating reflected light | |
| CN102130416B (en) | Laser apparatus | |
| CN114122898A (en) | Multimode high-power fiber laser and method for inhibiting stimulated Raman scattering effect | |
| JP2007221037A (en) | Optical amplifier, fiber laser, and reflection light removal method | |
| CN212991568U (en) | High power fiber laser oscillator system | |
| CN115912027A (en) | Optical fiber laser with high pumping efficiency and low nonlinear effect | |
| US20130329756A1 (en) | Laser apparatus | |
| CN212136882U (en) | High-power narrow linewidth Raman optical fiber amplifier | |
| CN111817122A (en) | Multi-pumping all-fiber laser based on cascade pumping structure | |
| CN111668685A (en) | High-power narrow linewidth Raman optical fiber amplifier | |
| JPS6153709B2 (en) | ||
| CN105322419B (en) | A kind of pulse optical fiber | |
| CN218472523U (en) | Cascade resonant cavity fiber laser | |
| US20240039232A1 (en) | Fibre laser assembly and method for generating high power laser radiation | |
| CN219966751U (en) | Mixed pulse high-power laser device for processing |
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 |