Thulium-doped fiber laser based on pumping wavelength conversion
阅读说明：本技术 一种基于泵浦波长转换的掺铥光纤激光器 (Thulium-doped fiber laser based on pumping wavelength conversion ) 是由 袁哲 刘腾 刘明 薛波新 沈文浩 徐维锋 刘普霞 杨超 于 2019-12-06 设计创作，主要内容包括：本申请提供了一种基于泵浦波长转换的掺铥光纤激光器,所述的激光器包括光纤冷却板、分别安装在光纤冷却板正反两面的第一泵浦源和第二泵浦源、激光谐振腔,所述的激光谐振腔包括光纤耦合器、有源光纤,所述的第一泵浦源和第二泵浦源的输出端连接所述的光纤耦合器的输入端。本申请的一种基于泵浦波长转换的光纤激光器,通过同时配置两种不同泵浦波长,以适应单一掺铥光纤长度,使得在连续模式于准连续模式下都获得优化的光光转换效率,并且能够有效控制光纤过短造成的剩余泵浦光,或避免过长造成的效率低下甚至无法起振等现象。(The application provides a thulium-doped fiber laser based on pumping wavelength conversion, the laser include the optical fiber cooling plate, install first pump source and second pump source, the laser cavity at the positive and negative both sides of optical fiber cooling plate respectively, the laser cavity include fiber coupler, active optical fiber, the output of first pump source and second pump source connect fiber coupler's input. The utility model provides a fiber laser based on pumping wavelength conversion through two kinds of different pumping wavelengths of configuration simultaneously to adapt to single thulium-doped fiber length, make all obtain the light conversion efficiency who optimizes under the quasi-continuous mode at the continuous mode, and can the effective control optic fibre overshort surplus pumping light that causes, or avoid the inefficiency that the overlength caused and can't rise phenomenons such as shake even.)
1. The utility model provides a thulium-doped fiber laser based on pumping wavelength conversion which characterized in that, the laser include the optical fiber cooling plate, install first pump source and second pump source, the laser cavity at the positive and negative both sides of optical fiber cooling plate respectively, the laser cavity include fiber coupler, active optical fiber, the output of first pump source and second pump source connect fiber coupler's input.
2. The thulium doped fiber laser based on pump wavelength conversion of claim 1, wherein the laser cavity further comprises a high reflective fiber grating and a low reflective fiber grating, wherein the output end of the fiber coupler is connected to the input end of the high reflective fiber grating, the output end of the high reflective fiber grating is connected to the input end of the active fiber, and the output end of the active fiber is connected to the input end of the low reflective fiber grating.
3. The thulium-doped fiber laser based on pump wavelength conversion of claim 1, wherein the fiber cooling plate has water pipes therein for cooling, and the water inlet and outlet of the water pipes are disposed at the side of the fiber cooling plate.
4. The thulium-doped fiber laser based on pump wavelength conversion as claimed in claim 1, wherein the pump wavelength of the first pump source is λ 1, the pump wavelength of the second pump source is λ 2, and the length L of the active fiber is the adapted length of the first pump source at power P1 and the adapted length of the second pump source at power P2.
5. The thulium-doped fiber laser based on pump wavelength conversion of claim 3, wherein the pump wavelength λ 1 of the first pump source is 1560nm ± 10nm, the pump wavelength λ 2 of the second pump source is 792nm ± 4nm, the output power P1 of the first pump source is 100w, the output power P2 of the second pump source is 500w, the length L of the active fiber is 5.4m to 6.0m, and the output center wavelength of the laser cavity is 1940 nm.
6. The thulium doped fiber laser based on pump wavelength conversion of claim 1, wherein the laser further comprises a first power module for powering the first pump source and a second power module for powering the second pump source.
7. The thulium doped fiber laser based on pump wavelength conversion of claim 6, further comprising a control module in signal connection with the first and second power supply modules, wherein the control module is configured to switch the power supply states of the first and second power supply modules.
Technical Field
The application relates to the technical field of laser, in particular to a thulium-doped fiber laser based on pumping wavelength conversion.
Background
The fiber laser, as a new generation solid laser, has the advantages of high efficiency, high stability, high beam quality and the like, and has been widely applied in various fields such as industry, medical treatment, scientific research and the like along with the rapid development in recent years. In the design process of the thulium-doped fiber laser, because of a complex energy level transition process and a strong reabsorption process, a strict fiber length design is required for the pump power and the output laser power of different power levels. This characteristic makes it impossible to obtain a high uniformity of the conversion efficiency of a continuous wave laser with a quasi-continuous laser at a corresponding average power over the length of the fiber.
Disclosure of Invention
The technical problem that this application will be solved provides a thulium-doped fiber laser based on pumping wavelength conversion, promptly through two kinds of different pumping wavelengths of configuration simultaneously to adapt to single thulium-doped fiber length.
In order to solve the technical problem, the application provides a thulium-doped fiber laser based on pumping wavelength conversion, the laser include the optical fiber cooling plate, install first pump source and second pump source, the laser cavity at the positive and negative both sides of optical fiber cooling plate respectively, the laser cavity include fiber coupler, active optical fiber, the output of first pump source and second pump source connect fiber coupler's input.
Preferably, the laser resonator further includes a high-reflectivity fiber grating and a low-reflectivity fiber grating, an output end of the fiber coupler is connected to an input end of the high-reflectivity fiber grating, an output end of the high-reflectivity fiber grating is connected to an input end of the active fiber, and an output end of the active fiber is connected to an input end of the low-reflectivity fiber grating.
Preferably, a water pipe for cooling is arranged in the optical fiber cooling plate, and a water inlet and a water outlet of the water pipe are arranged on the side edge of the optical fiber cooling plate.
Preferably, the pump wavelength of the first pump source is λ 1, the pump wavelength of the second pump source is λ 2, and the length L of the active fiber is the fitting length of the first pump source at the power of P1 and the fitting length of the second pump source at the power of P2.
Preferably, the pumping wavelength λ 1 of the first pump source is 1560nm ± 10nm, the pumping wavelength λ 2 of the second pump source is 792nm ± 4nm, the output power P1 of the first pump source is 100w, the output power P2 of the second pump source is 500w, the length L of the active fiber is 5.4m to 6.0m, and the output center wavelength of the laser resonator is 1940 nm.
Preferably, the laser further comprises a first power supply module for supplying power to the first pump source, and a second power supply module for supplying power to the second pump source.
Preferably, the laser further includes a control module in signal connection with the first power supply module and the second power supply module, and the control module is configured to switch power supply states of the first power supply module and the second power supply module.
The utility model provides a fiber laser based on pumping wavelength conversion through two kinds of different pumping wavelengths of configuration simultaneously to adapt to single thulium-doped fiber length, make all obtain the light conversion efficiency who optimizes under the quasi-continuous mode at the continuous mode, and can the effective control optic fibre overshort surplus pumping light that causes, or avoid the inefficiency that the overlength caused and can't rise phenomenons such as shake even.
Specific embodiments of the present application are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the application may be employed. It should be understood that the embodiments of the present application are not so limited in scope. The embodiments of the application include many variations, modifications and equivalents within the spirit and scope of the appended claims.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for assisting the understanding of the present application, and are not particularly limited to the shapes, the proportional sizes, and the like of the respective members in the present application. Those skilled in the art, having the benefit of the teachings of this application, may select various possible shapes and proportional sizes to implement the present application, depending on the particular situation.
FIG. 1 is a schematic diagram of the structure of a laser of the present application;
figure 2 is a schematic perspective view of a laser of the present application,
wherein: 1. a fiber coupler; 2. a highly reflective fiber grating; 3. a low reflection fiber grating; 4. an optical fiber cooling plate; 5. an active optical fiber; 6. a first pump source; 7. a second pump source.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The application provides a thulium-doped fiber laser based on pumping wavelength conversion, the laser include optical fiber cooling plate 4, install first pump source 6 and second pump source 7, the laser cavity at 4 positive and negative two sides of optical fiber cooling plate respectively, the laser cavity include optical fiber coupler 1, active
The pump wavelength of the first pump source 6 is λ 1, the pump wavelength of the second pump source 7 is λ 2, and the length L of the
The laser also comprises a first power supply module for supplying power to the first pump source 6 and a second power supply module for supplying power to the second pump source 7. The laser further comprises a control module in signal connection with the first power supply module and the second power supply module, and the control module is used for switching the power supply states of the first power supply module and the second power supply module.
In a preferred embodiment, the pump wavelength λ 1 of the first pump source 6 is 1560nm ± 10nm, the pump wavelength λ 2 of the second pump source 7 is 792nm ± 4nm, the output power P1 of the first pump source 6 is 100w, the output power P2 of the second pump source 7 is 500w, the length L of the
Taking a pumping source with a wavelength of 1940nm as an example, when the thulium-doped fiber laser outputs laser with a wavelength near 1940nm, due to the complex quasi-three-level particle energy state and the extremely strong in-absorption effect, when the length of the
When the output of a certain thulium-doped fiber laser is 1940nm, and the pump light power is 100W, 180W and 500W respectively, the optimal fiber length is 2.9m, 3.6m and 5.4m respectively, otherwise, the laser conversion efficiency is reduced, and additional heat load is caused. The operation state of the pump source is assumed to be 20% duty cycle operation, peak power 500W case, or 100W continuous operation case. Although the average power of the two is the same, the optical efficiency cannot reach the maximum in the quasi-pulse operation mode of the pump source if the length of the optical fiber is 2.9m, and the optical efficiency is reduced and the heat effect is accompanied in the continuous operation mode of the pump source if the length of the optical fiber is 5.5 m.
To avoid this problem, the present application proposes to pump the laser using two wavelength pump sources. The wavelength of the first pump source 6 is 793nm and the wavelength of the second pump source 7 is 1560nm, and taking into account that the absorption cross section at 1560nm is approximately 1/2 at 793nm, in extension the
The utility model provides a fiber laser based on pumping wavelength conversion through two kinds of different pumping wavelengths of configuration simultaneously to adapt to single thulium-doped fiber length, make all obtain the light conversion efficiency who optimizes under the quasi-continuous mode at the continuous mode, and can the effective control optic fibre overshort surplus pumping light that causes, or avoid the inefficiency that the overlength caused and can't rise phenomenons such as shake even.
The scheme has the advantage that the thulium-doped fiber laser with the continuous/quasi-continuous two working systems coexisting can be obtained by adopting a single laser link.
It is to be noted that, in the description of the present application, the meaning of "a plurality" is two or more unless otherwise specified.
All articles and references disclosed, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional.
A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.
It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of subject matter that is disclosed herein is not intended to forego the subject matter and should not be construed as an admission that the applicant does not consider such subject matter to be part of the disclosed subject matter.
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