CN112864787A - Solid laser gain module - Google Patents
Solid laser gain module Download PDFInfo
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- CN112864787A CN112864787A CN201911176428.0A CN201911176428A CN112864787A CN 112864787 A CN112864787 A CN 112864787A CN 201911176428 A CN201911176428 A CN 201911176428A CN 112864787 A CN112864787 A CN 112864787A
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- laser gain
- pump light
- gain medium
- solid
- light coupling
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- 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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
-
- 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
- H01S3/0602—Crystal lasers or glass lasers
- H01S3/0604—Crystal lasers or glass lasers in the form of a plate or disc
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Lasers (AREA)
Abstract
The invention provides a solid laser gain module, comprising: a solid laser gain medium; the N semiconductor lasers are distributed around the solid laser gain medium; the semiconductor laser device comprises N pump light coupling fibers, wherein the semiconductor laser device realizes pump light output through one pump light coupling fiber, the output ends of the pump light coupling fibers are uniformly distributed along the circumferential direction of a solid laser gain medium, the pump light output by the pump light coupling fibers is incident through the side face of the solid laser gain medium to pump the solid laser gain medium, the optical axis of the pump light coupling fibers is parallel to the upper surface and the lower surface of the solid laser gain medium, and a fixed included angle a is formed between the optical axis of the pump light coupling fibers and the connecting line of the circle center of the solid laser gain medium and the circle center of the optical fiber output end face of the pump. The invention overcomes the defect that the traditional DPSSL laser has low mode matching efficiency, and can effectively restrict the pump light in the crystal so as to obtain high-efficiency mode matching efficiency.
Description
Technical Field
The invention belongs to the technical field of laser, and particularly relates to a solid laser gain module.
Background
The mode matching efficiency of a semiconductor pumped solid state laser (DPSSL) is one of the key factors that restrict the overall operating efficiency of the laser, so how to improve the mode matching efficiency and increase the utilization rate of pump light is a key problem to be solved for improving the operating efficiency of the solid state laser. At present, the efficiency of fiber laser is generally higher than that of DPSSL, mainly because the fiber laser adopts a double-clad fiber technology, the pump light is well constrained in the inner cladding of the fiber, the utilization rate of the pump light is greatly improved, and for DPSSL, especially for Yb-doped quasi-three-level solid laser gain media, higher pump power density is needed, so that the pump light needs to be focused to a smaller light spot, larger laser divergence is generated before and after the focus, and the mode matching efficiency of the laser is seriously reduced.
Disclosure of Invention
According to the technical problem that DPSSL laser mode matching efficiency is low, the novel solid laser gain module is provided, and coupling efficiency is improved according to the overall design of the diameter of a fiber core, the numerical aperture and the distance between an output end and the side face of a solid laser gain medium cylinder of a pumping optical coupling fiber.
The technical means adopted by the invention are as follows:
a solid state laser gain module, comprising:
a solid state laser gain medium arranged in a cylindrical shape;
the N semiconductor lasers are distributed around the solid laser gain medium, wherein N is more than or equal to 3;
the semiconductor laser device comprises N pump light coupling fibers, wherein the semiconductor laser device realizes pump light output through one pump light coupling fiber, the output ends of the pump light coupling fibers are uniformly distributed along the circumferential direction of a solid laser gain medium, the pump light output by the pump light coupling fibers is incident through the side face of the solid laser gain medium to pump the solid laser gain medium, the optical axis of the pump light coupling fibers is parallel to the upper surface and the lower surface of the solid laser gain medium, and a fixed included angle a is formed between the optical axis of the pump light coupling fibers and the connecting line of the circle center of the solid laser gain medium and the circle center of the optical fiber output end face of the pump.
Further, the distance between the circle center of the output end face of the pump light coupling fiber and the upper and lower surfaces of the solid laser gain medium is equal, and the optical axis of the pump light coupling fiber is parallel to the two surfaces of the solid laser gain medium.
Further, the fixed included angle a is determined according to the output power of the single semiconductor laser, the diameter and the numerical aperture of the fiber core of the pump light coupling fiber, the pump power density required by the monolithic solid laser gain medium, and the uniformity of the energy distribution thereof.
Further, the side surface of the solid laser gain medium is coated with a film in a sub-region, wherein the coating comprises a high-transmittance film coated on the pump light wavelength in a region right opposite to the optical fiber output end face of the pump light coupling optical fiber, and a high-reflection film coated on the pump light wavelength in the rest regions; and plating high-transmission films on the upper surface and the lower surface of the solid gain medium for the wavelength of laser light, and plating high-reflection films on the wavelength of the pump light.
Further, the solid laser gain medium is doped with laser active ions, and the laser active ions are Nd3+、Yb3+、Er3+、Ho3+、Tm3+One kind of (1).
Further, the solid laser gain medium is formed by superposing a single piece or multiple pieces of cylindrical solid laser gain medium.
Compared with the prior art, the invention has the following advantages:
the invention overcomes the defect of low mode matching efficiency of the traditional DPSSL laser, adopts the design of a novel solid laser gain module, and can effectively restrict the pump light in the crystal so as to obtain high-efficiency mode matching efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a laser gain module according to the present invention.
FIG. 2 is a schematic diagram of a cylindrical side surface coating region of the laser gain module according to the present invention.
In the figure: 1. a semiconductor laser; 2. a pump light coupling fiber; 3. a solid laser gain medium.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
As shown in fig. 1, the present invention provides a solid-state laser gain module, comprising: a solid laser gain medium 3 arranged in a cylindrical shape, in which laser active ions are doped, the laser active ions being Nd3+、Yb3+、Er3+、Ho3+、Tm3+One kind of (1). N semiconductor lasers 1 distributed around the solid laser gain medium 3, wherein N is more than or equal to 3. Arbitrary semiconductor laser 1 all realizes pump light output through a pump light coupling fiber 2, the output of pump light coupling fiber 2 is along the circumference evenly distributed of solid laser gain medium 3, just the pump light of pump light coupling fiber 2 output passes through the side incidence of solid laser gain medium 3, pumps solid laser gain medium 3, and its optical axis is parallel with the upper and lower surface of solid laser gain medium 3, and has fixed contained angle a between the line with the fiber output terminal surface centre of a circle of pump light coupling fiber 2 and the solid laser gain medium 3 centre of a circle.
Further, the distance between the circle center of the output end face of the pump light coupling fiber and the upper and lower surfaces of the solid laser gain medium is equal, and the optical axis of the pump light coupling fiber is parallel to the two surfaces of the solid laser gain medium. Coating a film on the side surface of the solid laser gain medium in regions, wherein the region opposite to the optical fiber output end surface of the pump light coupling optical fiber is coated with a high-transmittance film for the wavelength of the pump light, and the rest regions are coated with high-reflectance films for the wavelength of the pump light; and plating high-transmission films on the upper surface and the lower surface of the solid gain medium for the wavelength of laser light, and plating high-reflection films on the wavelength of the pump light.
Further, the solid laser gain medium may be a single piece or a stack of multiple pieces of cylindrical solid laser gain medium.
The technical solution of the present invention is further illustrated by the following specific examples.
The invention overcomes the defect of low mode matching efficiency of the traditional DPSSL laser, provides a design of a novel solid laser gain module, and can effectively restrict the pump light in the crystal so as to obtain high-efficiency mode matching efficiency. Fig. 1 illustrates a structure of a laser gain module according to an embodiment of the present invention, and for convenience of description, only the portions related to the embodiment of the present invention are illustrated, and the detailed description is as follows:
the utility model provides a novel solid laser gain module, includes 1 solid laser gain medium 3, 4 semiconductor laser 1, 4 pump light coupling optic fibre 2, every semiconductor laser 1 is through one pump light coupling optic fibre 2 realizes pump light output, and is concrete, and in practical application, the fibre core diameter and the numerical aperture of pump light coupling optic fibre 2 can be confirmed according to semiconductor laser 1's laser parameter.
The solid laser gain medium 3 is in a circular thin sheet shape, the output ends of 4 pump light coupling fibers 2 are uniformly distributed along the circumference of the solid laser gain medium 3, the pump light output by the pump light coupling fibers 2 is incident through the cylindrical side surface of the solid laser gain medium 3 to pump the solid laser gain medium 3, the distance between the circle center of the output end surface of the pump light coupling fibers 2 and the upper and lower surfaces of the solid laser gain medium 3 is equal, the optical axis of the pump light coupling fibers 2 is parallel to the two surfaces of the solid laser gain medium 3, and a certain included angle a is formed between the circle center of the fiber output end surface of the pump light coupling fibers 2 and the connecting line of the circle center of the solid laser gain medium 3 The diameter and the numerical aperture of the core of the pump light coupling fiber 2, the required pump power density of the monolithic solid laser gain medium 3 and the uniformity of the energy distribution thereof.
The present embodiment is illustrated by taking the 4 semiconductor lasers 1 as an example, but the present embodiment does not limit the implementable schemes of the present invention.
Fig. 2 is a schematic diagram of a cylindrical side coating area of the laser gain module. The cylindrical surface of the solid laser gain medium 3 is coated with films in regions, the region close to the optical fiber output end face of the pump light coupling optical fiber 2 is coated with a high-transmission film for the wavelength of the pump light, the other regions are coated with high-reflection films for the wavelength of the pump light, the upper surface and the lower surface of the solid laser gain medium 3 are coated with high-transmission films for the wavelength of the pump light, and the high-reflection films for the wavelength of the pump light are coated. Specifically, in practical application, the size of the region close to the fiber output end face of the pump light coupling fiber 2 and the incidence angle range corresponding to high transmission and high reflection can be designed according to the fiber core diameter, the numerical aperture and the distance between the output end of the pump light coupling fiber 2 and the cylindrical side face of the solid laser gain medium 3, so as to realize high coupling efficiency.
In this embodiment, air cooling or water cooling may be adopted, and refrigeration is performed through two circular surfaces of the solid gain medium 3, specifically, in practical application, the cooling mode may be selected according to the heat generated by the solid gain medium 3.
According to the novel solid laser gain module provided by the invention, the laser active ions doped in the solid laser gain medium 3 can be one of Nd3+, Yb3+, Er3+, Ho3+ and Tm3+ according to actual application.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A solid state laser gain module, comprising:
a solid laser gain medium arranged as a cylindrical slab;
the N semiconductor lasers are distributed around the solid laser gain medium, wherein N is more than or equal to 3;
the semiconductor laser device comprises N pump light coupling fibers, wherein the semiconductor laser device realizes pump light output through one pump light coupling fiber, the output ends of the pump light coupling fibers are uniformly distributed along the circumferential direction of a solid laser gain medium, the pump light output by the pump light coupling fibers is incident through the side face of the solid laser gain medium to pump the solid laser gain medium, the optical axis of the pump light coupling fibers is parallel to the upper surface and the lower surface of the solid laser gain medium, and a fixed included angle a is formed between the optical axis of the pump light coupling fibers and the connecting line of the circle center of the solid laser gain medium and the circle center of the optical fiber output end face of the pump.
2. The solid laser gain module of claim 1, wherein the center of the output end face of the pump light coupling fiber is equal to the distance between the upper and lower surfaces of the solid laser gain medium, and the optical axis of the pump light coupling fiber is parallel to the two surfaces of the solid laser gain medium.
3. The solid laser gain module of claim 1, wherein the fixed included angle a is determined according to the output power of a single semiconductor laser, the core diameter and numerical aperture of the pump light coupling fiber, the required pump power density of the monolithic solid laser gain medium, and the uniformity of the energy distribution thereof.
4. The solid state laser gain module of claim 1, wherein the coating of the film on the side surface of the solid state laser gain medium comprises coating a high transmission film on the pump light wavelength in a region directly opposite to the fiber output end face of the pump light coupling fiber, and coating a high reflection film on the pump light wavelength in the remaining region; and plating high-transmission films on the upper surface and the lower surface of the solid gain medium for the wavelength of laser light, and plating high-reflection films on the wavelength of the pump light.
5. The solid state laser gain module of claim 1, wherein the solid state laser gain medium is doped with laser active ions, the laser active ions being Nd3+、Yb3+、Er3+、Ho3+、Tm3+One kind of (1).
6. The solid state laser gain module according to any of claims 1-5, wherein the solid state laser gain medium comprises a single or multiple superimposed sheets of solid state laser gain medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911176428.0A CN112864787A (en) | 2019-11-26 | 2019-11-26 | Solid laser gain module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911176428.0A CN112864787A (en) | 2019-11-26 | 2019-11-26 | Solid laser gain module |
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| CN112864787A true CN112864787A (en) | 2021-05-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114583538A (en) * | 2022-03-04 | 2022-06-03 | 中国科学院理化技术研究所 | Laser gain module of off-axis pump |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1398028A (en) * | 2002-08-23 | 2003-02-19 | 清华大学 | Corner pumping method for plate strip and its solid laser gain module |
| JP2006134960A (en) * | 2004-11-02 | 2006-05-25 | Sunx Ltd | Laser oscillator and laser beam machine |
| CN103986047A (en) * | 2014-05-19 | 2014-08-13 | 中国电子科技集团公司第二十七研究所 | Encircling type high-density injection waveguide laser device and laser generating method |
| CN206864860U (en) * | 2017-04-18 | 2018-01-09 | 福建海创光电有限公司 | A kind of semiconductor side pumped amplification system |
-
2019
- 2019-11-26 CN CN201911176428.0A patent/CN112864787A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1398028A (en) * | 2002-08-23 | 2003-02-19 | 清华大学 | Corner pumping method for plate strip and its solid laser gain module |
| JP2006134960A (en) * | 2004-11-02 | 2006-05-25 | Sunx Ltd | Laser oscillator and laser beam machine |
| CN103986047A (en) * | 2014-05-19 | 2014-08-13 | 中国电子科技集团公司第二十七研究所 | Encircling type high-density injection waveguide laser device and laser generating method |
| CN206864860U (en) * | 2017-04-18 | 2018-01-09 | 福建海创光电有限公司 | A kind of semiconductor side pumped amplification system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114583538A (en) * | 2022-03-04 | 2022-06-03 | 中国科学院理化技术研究所 | Laser gain module of off-axis pump |
| CN114583538B (en) * | 2022-03-04 | 2023-11-14 | 中国科学院理化技术研究所 | Off-axis pumping laser gain module |
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Application publication date: 20210528 |