CN217360506U - High-power femtosecond pulse nonlinear compression device based on hollow optical fiber - Google Patents
High-power femtosecond pulse nonlinear compression device based on hollow optical fiber Download PDFInfo
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- CN217360506U CN217360506U CN202221548088.7U CN202221548088U CN217360506U CN 217360506 U CN217360506 U CN 217360506U CN 202221548088 U CN202221548088 U CN 202221548088U CN 217360506 U CN217360506 U CN 217360506U
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Abstract
The application relates to a high-power femtosecond pulse nonlinear compression device based on a hollow optical fiber, which is used for further nonlinear compression of the high-power femtosecond pulse and comprises the hollow optical fiber, a first cavity, a second cavity and a third cavity; the first cavity, the second cavity and the third cavity are communicated in sequence to form a closed compression chamber; the front end of the first cavity is fixedly connected with the incident window, and the rear end of the third cavity is fixedly connected with the emergent window; v-shaped grooves are formed in the first cavity, the second cavity and the third cavity and communicated with each other, the hollow optical fibers are integrally arranged in the V-shaped grooves, and the hollow optical fibers are completely overlapped with incident laser. Water cooling pipeline sets are laid on the inner sides of the bottoms of the cavities; the number of water-cooling pipeline group is three groups, and the structure is the same, all includes the water-cooling pipeline, and the number of every group water-cooling pipeline is two, and is parallel to each other. One side of the first cavity, which is close to one end of the incident window, is provided with an air port outwards, one side of the third cavity, which is close to one end of the emergent window, is also provided with an air port outwards, and the laser is in the hollow optical fiber to generate nonlinear interaction with the gas. Through setting up the device into the components of a whole that can function independently that the three section aluminum alloy is the material, the components of a whole that can function independently sets up the connecting plate, with screwed connection's mode between the adjacent connecting plate, realize the purpose of being convenient for install and debugging, practice thrift the cost.
Description
Technical Field
The application relates to the technical field of post-pulse compression, in particular to a high-power femtosecond pulse nonlinear compression device based on hollow optical fibers.
Background
Ultrashort pulse laser is widely applied to the fields of instant imaging, laser processing, laser surgery and the like, wherein CPA (chirped-pulse amplification) and OPCPA (optical parametric chirped-pulse amplification) are the main technical means for generating ultrashort pulse laser at present, and because the phenomena of gain narrowing, energy backflow, phase mismatch and the like exist in the laser generating process, the generated laser pulse width is limited to tens to hundreds of femtoseconds through a pulse post-compression technology, that is, the laser pulse width can be further shortened by a certain nonlinear spectral broadening technology and a dispersion compensation technology. The current pulse post-compression technology mainly comprises a femtosecond pulse nonlinear compression device based on photonic crystal fibers, gas filamentation, bulk materials and hollow fibers. The non-linear compression device based on the hollow-core optical fiber has the characteristics of high ionization threshold, flexible and variable non-linearity, no dispersion and the like, and is developed rapidly.
The traditional femtosecond pulse nonlinear compression device of the hollow-core optical fiber is made of stainless steel, the cavity is integrally formed, the difficulty of installation and debugging is high due to the long cavity, and the cost is high.
SUMMERY OF THE UTILITY MODEL
In view of this, the application provides a high-power femtosecond pulse nonlinear compression device based on a hollow optical fiber, wherein a cavity is arranged into three aluminum split bodies, and the split bodies are connected through screws, so that the purpose of convenience in installation and debugging is achieved.
According to one aspect of the application, a high-power femtosecond pulse nonlinear compression device based on a hollow-core optical fiber is provided, and is used for further compressing a high-power femtosecond pulse, and is characterized by comprising the hollow-core optical fiber, a first cavity, a second cavity and a third cavity;
the first cavity, the second cavity and the third cavity are communicated in sequence to form a closed compression chamber;
the front end of the first cavity is fixedly connected with the incident window, and the rear end of the third cavity is fixedly connected with the emergent window;
v-shaped grooves are formed in the first cavity, the second cavity and the third cavity and communicated with each other, the hollow optical fiber is integrally arranged in the V-shaped grooves, and the hollow optical fiber is completely superposed with incident laser; water cooling pipeline sets are laid on the inner sides of the bottoms of the first cavity, the second cavity and the third cavity; the quantity of water-cooling pipeline group is three groups, and the structure is the same, all includes water-cooling pipeline, every group water-cooling pipeline's quantity is two, is parallel to each other.
One side of the first cavity, which is close to one end of the incident window, is provided with an air port outwards, one side of the third cavity, which is close to one end of the emergent window, is also provided with an air port outwards, and the laser is in the hollow optical fiber and the gas generate nonlinear interaction.
In a possible implementation manner, the incident window and the exit window have the same structure;
one side of the incident window is bent, and the top and the bottom of the other side of the incident window are symmetrically provided with two strip-shaped grooves;
the incident window is provided with an incident hole, and the incident hole is arranged at the front end of the incident window; and the exit window is provided with an exit hole which is arranged at one end of the exit window departing from the third cavity.
In a possible implementation manner, an observation window is formed at the top end of the first cavity;
the observation window is arranged on the central axis of the first cavity.
In a possible implementation manner, the outer walls of the left side and the right side of the bottom of the first cavity, the second cavity and the third cavity are symmetrically provided with pressing block grooves, and the pressing block grooves are in a long strip shape and can be connected with the optical platform through fixing pieces.
In a possible implementation mode, the water path interfaces are arranged at the front end and the rear end of the bottom of the first cavity, the second cavity and the third cavity, the water cooling pipeline is matched with the water path interfaces, one end of each water path interface is connected with the water cooling pipeline, and the other end of each water path interface can be connected with the quick-inserting type water pipe.
In a possible implementation manner, the main structures of the first cavity, the second cavity and the third cavity are the same and are all in a shape of a letter "T", four connecting plates are arranged among the first cavity, the second cavity and the third cavity, and the connecting plates are connected by threads.
In one possible implementation, the entrance window and the exit window both use brewster window sheets.
In a possible implementation manner, the first cavity, the second cavity, and the third cavity are made of aluminum alloy.
The high-power femtosecond pulse nonlinear compression device based on the hollow optical fiber is characterized in that the device is arranged into three sections of aluminum split bodies, and screws are arranged between every two sections of cavities in a penetrating mode through connecting plates to be connected with O-shaped sealing rings. Firstly, laser is focused through a concave reflector, and the purpose that the size of a light spot at a focus is matched with the size of the core diameter of a hollow optical fiber arranged in a cavity is achieved. Laser enters the cavity from the incident window, gas is filled into the vacuum cavity through the gas port arranged on the side wall of the cavity, so that the laser can generate nonlinear interaction with the gas in the hollow optical fiber to achieve the purpose of broadening the laser spectrum and further compressing the laser pulse width, and meanwhile, an integrated water cooling pipeline is laid on the inner side of the bottom of each cavity, so that the device can be suitable for nonlinear compression of high-power femtosecond laser pulse. The structure can ensure the air tightness of the device and is convenient to install and debug, and the split structure can solve the problem of high cost of the device.
Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the application and, together with the description, serve to explain the principles of the application.
FIG. 1 is a schematic diagram of a main structure of an embodiment of the present application;
FIG. 2 is a schematic bottom view of an embodiment of the present application;
FIG. 3 illustrates a schematic top view of an embodiment of the present application;
FIG. 4 is a schematic diagram illustrating a front view structure of an embodiment of the present application;
FIG. 5 shows a schematic view of the direction of an entrance window of an embodiment of the present application;
fig. 6 shows an internal structural diagram of an embodiment of the present application.
Detailed Description
Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
It is to be understood, however, that the terms "central," "longitudinal," "lateral," "length," "width," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing or simplifying the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered limiting of the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present application. It will be understood by those skilled in the art that the present application may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present application.
FIG. 1 is a schematic diagram of a main structure of an embodiment of the present application; FIG. 2 is a schematic bottom view of an embodiment of the present application; FIG. 3 illustrates a schematic top view of an embodiment of the present application; FIG. 4 is a schematic diagram illustrating a front view structure of an embodiment of the present application; FIG. 5 shows a schematic view of the direction of an entrance window of an embodiment of the present application; fig. 6 shows an internal structural diagram of an embodiment of the present application. As shown in fig. 1 and 6, the high-power femtosecond pulse nonlinear compression device based on the hollow-core optical fiber is used for further compressing the high-power femtosecond pulse, and comprises a hollow-core optical fiber 400, a first cavity 110, a second cavity 120 and a third cavity 130; the first cavity 110, the second cavity 120 and the third cavity 130 are communicated in sequence to form a closed compression cavity; the front end of the first cavity 110 is fixedly connected with the incident window 140, the rear end of the third cavity 130 is fixedly connected with the exit window 150, the first cavity 110, the second cavity 120 and the third cavity 130 are all internally provided with V-shaped grooves 300 and communicated, the hollow optical fiber 400 is integrally arranged in the V-shaped grooves 300, and the hollow optical fiber 400 is completely overlapped with the incident laser. The water cooling pipeline set 160 is laid on the inner sides of the bottoms of the first cavity 110, the second cavity 120 and the third cavity 130; the number of the water cooling pipeline groups 160 is three, the structure is the same, the water cooling pipeline groups all comprise water cooling pipelines 161, and the number of each group of the water cooling pipelines 161 is two, and the two groups of the water cooling pipelines are parallel to each other. The first cavity 110 has an outward opening 111 at a side thereof close to the entrance window 140, and the third cavity 130 has an outward opening 111 at a side thereof close to the exit window 150, so that the laser interacts with the gas in the hollow-core optical fiber 400 in a non-linear manner.
Therefore, the high-power femtosecond pulse nonlinear compression device based on the hollow-core fiber in the embodiment of the application has the advantages that the device is composed of three independent separable cavities, the first cavity 110, the second cavity 120 and the third cavity 130 are all vacuum cavities and are sequentially connected and communicated to form a closed compression cavity, and the front end and the rear end of the device are provided with the incident window 140 and the exit window 150. Before the laser enters the device, the concave reflector focuses the laser, so that the size of a light spot at the focal point is matched with the size of the core diameter of the hollow-core optical fiber 400 arranged in the device. Specifically, the hollow-core optical fiber 400 is disposed in the V-groove 300 and completely coincides with the incident laser, the V-groove 300 is disposed inside and communicated with the first cavity 110, the second cavity 120, and the third cavity 130, and the size of the light spot at the focus is matched with the core diameter of the hollow-core optical fiber 400, so that the laser can be efficiently coupled into the hollow-core optical fiber 400. The integrated water cooling pipeline 161 laid on the inner sides of the bottoms of the first cavity 110, the second cavity 120 and the third cavity 130 enables the device to be suitable for nonlinear compression of high-power femtosecond laser pulses. Because the ionization threshold of gas is far higher than that of a solid material, the laser pulse width expanding device is suitable for a laser system with high peak power, and laser spectrum broadening and pulse width compression are realized based on the nonlinear effect of laser and gas, gas ports 111 are symmetrically formed in the side walls of the first cavity 110 and the second cavity 130, the number of the gas ports 111 is six, the gas ports are arranged on the same side of the cavity wall and used for charging and discharging gas into and from the whole vacuum cavity, and the laser can perform nonlinear interaction with the gas in the hollow-core optical fiber 400, so that the purpose of broadening the laser spectrum and further compressing the laser pulse width is realized. It should be noted that the width and pulse width of the output laser spectrum are related to the type and pressure of the gas filled in the vacuum cavity and the length of the hollow-core optical fiber, specifically, the gas filled in the cavity includes helium, krypton, and the like, and can be connected to a gas pressure meter to monitor the pressure in the cavity in real time. The type of gas and the pressure in the cavity can be flexibly changed according to different requirements, and the length of the hollow-core optical fiber 400 can be flexibly changed to output different laser spectral widths and pulse widths. Compared with the traditional femtosecond pulse nonlinear compression device, the whole device is set into three aluminum alloy cavities which can be independently split, the length of the hollow optical fiber 400 can be changed as required to realize the purpose of outputting different pulse widths, the installation and debugging difficulty is reduced, and the cost is saved.
In one possible implementation manner, as shown in fig. 4 and 5, the incident window 140 and the exit window 150 have the same structure, and are symmetrically disposed at the front and rear ends of the first cavity 110 and the third cavity 130; one side of the incident window 140 is bent, and the top and the bottom of the other side are symmetrically provided with two strip-shaped grooves. The front end of the incident window 140 is provided with an incident hole 141, and laser enters the cavity from the incident hole 141; the exit window 150 is provided with an exit hole 151, and the exit hole 151 is arranged at one end of the exit window 150, which is away from the third cavity 130.
Here, it should be noted that the incident window 140 and the exit window 150 are respectively disposed at the front and rear ends of the device, before the laser enters the first cavity 110, the laser is focused by the concave mirror, and enters the vacuum cavity through the incident hole 141 disposed at the front end of the incident window 140, the size of the laser spot focused by the concave mirror matches the size of the core diameter of the hollow-core fiber 400, and meanwhile, one side of the incident window 140 and one side of the exit window 150 are bent, so that the incident angle of the inclined plane of the incident window and the inclined plane of the exit window is adapted to be the brewster angle, thereby realizing that the laser is coupled into the fiber in the cavity in an efficient manner, and finally emitted through the exit hole 151 disposed on the exit window 150, thereby realizing the compression of the laser pulse width.
In a possible implementation manner, as shown in fig. 3, the top end of the first cavity 110 is provided with a viewing window 114; the viewing window 114 is disposed on the central axis of the first cavity 110.
Here, it should be noted that the observation window 114 is disposed on the upper cover of the first cavity 110, and the observation window 114 can be used to observe the port position and state of the hollow-core optical fiber 400 inside the first cavity 110, so as to prevent displacement of the hollow-core optical fiber 400 from affecting the efficiency of laser coupling in the hollow-core optical fiber 400.
In a possible implementation manner, the outer walls of the left and right sides of the bottoms of the first cavity 110, the second cavity 120, and the third cavity 130 are symmetrically provided with pressing block grooves 113, and the pressing block grooves 113 are long-strip-shaped and can be connected to the optical platform through the fixing member 200.
Specifically, the side walls of the bottoms of the first cavity 110, the second cavity 120 and the third cavity 130 are symmetrically provided with six strip-shaped pressing block grooves 113, the number of the pressing block grooves 113 is six, and the fixing member 200 is fixed at the bottom edge of the pressing block groove 113 through one end and is pressed on the optical platform through the other end to realize the purpose that the device is fixed on the optical platform. For example, the fixing member 200 may be a fork-shaped pressing block, one part of the fork-shaped pressing block presses against the bottom edge of the groove, and the other part of the fork-shaped pressing block presses against the optical platform, wherein the pressing part of the optical platform is fixed and pressed by using a screw, so that the device is more stable.
In a possible implementation manner, water path interfaces are provided at the front and rear ends of the bottoms of the first cavity 110, the second cavity 120 and the third cavity 130, the water-cooling pipeline 161 is matched with the water path interface 112, one end of the water path interface 112 is connected with the water-cooling pipeline 161, and the other end can be connected with a quick-plugging water pipe.
It should be noted here that the water cooling pipes 161 are laid at the bottoms of the first cavity 110, the second cavity 120 and the third cavity 130, the number of the water cooling pipes 161 in each cavity is two, the front end and the rear end of each water cooling pipe 161 are provided with the water path interfaces 112, cooling water enters from the two water path interfaces 112 at the front end of the bottom of the first cavity 110, flows through the water cooling pipes 161 to the two water path interfaces 112 at the rear end, the water path interfaces 112 between the first cavity 110 and the second cavity 120 are connected by fast-plugging water pipes, so as to realize the communication of the water paths of each cavity, and finally flows out from the water path interface 112 at the rear end of the third cavity 130, and the integrated water cooling pipes make the device suitable for the nonlinear compression of the high-power femtosecond laser pulses, and have high heat dissipation speed, thereby preventing the cavities from being deformed due to heat accumulation, and protecting the structure of the device.
In a possible implementation manner, the main structures of the first cavity 110, the second cavity 120 and the third cavity 130 are the same and are all in a shape like a "T", the connecting plates 121 are arranged among the first cavity 110, the second cavity 120 and the third cavity 130, the number of the connecting plates 121 is four, and the connecting manner between two adjacent connecting plates 121 is a threaded connection.
Specifically, two adjacent connecting plates are connected in a mode that a screw penetrates through an O-shaped sealing ring, and the fixed connection of each cavity is realized.
In one possible implementation, the incident window 140 and the exit window 150 both use brewster window plates, which can reduce the transmission loss of the laser.
Here, it should be noted that optical loss is generated during the laser transmission process, and the brewster window is adopted for the incident window 140 and the exit window 150 at the front and rear ends of the first cavity 110 and the third cavity 130, so that the loss generated during the laser transmission process can be effectively reduced.
In a possible implementation manner, the first cavity 110, the second cavity 120, and the third cavity 130 are made of an aluminum alloy.
Here, it should be noted that, compared with a stainless steel material, the aluminum alloy material can reduce the installation and debugging difficulty, and the all-aluminum cavity is easier to process while ensuring the air tightness, so that the cost can be reduced.
In summary, in the process of further compressing the laser, the hollow-core fiber-based high-power femtosecond pulse nonlinear compression device adopts three independent separable cavities to replace the whole cavity, the hollow-core fiber 400 with a certain length is arranged in the cavity according to specific requirements, the hollow-core fiber 400 is made of glass, the front end and the rear end of the first cavity 110 and the third cavity 130 are symmetrically provided with the incident window 140 and the exit window 150, the brewster window piece is adopted to effectively reduce the transmission loss of the laser, the laser is focused by the concave reflector before entering the first cavity 110, the size of the incident laser spot is matched with the size of the hollow-core fiber core, and the arrangement direction of the hollow-core fiber 400 is overlapped with the laser incident direction, so that the laser can be coupled into the fiber in an efficient manner. The integrated water cooling pipeline 161 laid on the inner sides of the bottoms of the first cavity 110, the second cavity 120 and the third cavity 130 enables the device to be suitable for nonlinear compression of high-power femtosecond laser pulses. Meanwhile, the air charging and discharging ports 111 formed at the bottom of the first cavity 110 and the third cavity 130 can charge air into the vacuum cavity, so that the laser generates nonlinear action with the air in the hollow optical fiber 400, and the purpose of widening the laser spectrum and further compressing the laser pulse is achieved. Therefore, the cavity is divided into three sections, and the aluminum alloy material is adopted, so that the installation and debugging difficulty can be reduced while the air tightness is guaranteed, and the cost is saved.
Having described embodiments of the present application, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (8)
1. A high-power femtosecond pulse nonlinear compression device based on a hollow optical fiber is used for further compressing a high-power femtosecond pulse and is characterized by comprising the hollow optical fiber, a first cavity, a second cavity and a third cavity;
the first cavity, the second cavity and the third cavity are communicated in sequence to form a closed compression chamber;
the front end of the first cavity is fixedly connected with the incident window, and the rear end of the third cavity is fixedly connected with the emergent window;
v-shaped grooves are formed in the first cavity, the second cavity and the third cavity and communicated with each other, the hollow optical fiber is integrally arranged in the V-shaped grooves, and the hollow optical fiber is completely superposed with incident laser; water cooling pipeline sets are laid on the inner sides of the bottoms of the first cavity, the second cavity and the third cavity; the number of the water cooling pipeline groups is three, the structures of the water cooling pipeline groups are the same, the water cooling pipeline groups all comprise water cooling pipelines, and the number of the water cooling pipelines in each group is two and the water cooling pipelines are parallel to each other;
one side of the first cavity, which is close to one end of the incident window, is provided with an air port outwards, one side of the third cavity, which is close to one end of the emergent window, is also provided with an air port outwards, and the laser is in the hollow optical fiber and the gas generate nonlinear interaction.
2. The hollow-core fiber-based high-power femtosecond pulse nonlinear compression device according to claim 1, wherein the incident window and the exit window are identical in structure;
one side of the incident window is bent, and the top and the bottom of the other side of the incident window are symmetrically provided with two strip-shaped grooves;
the incident window is provided with an incident hole, the incident hole is arranged at the front end of the incident window, the emergent window is provided with an emergent hole, and the emergent hole is arranged at one end of the emergent window, which is far away from the third cavity.
3. The high-power femtosecond pulse nonlinear compression device based on the hollow-core optical fiber according to claim 1, wherein the top end of the first cavity is provided with an observation window;
the observation window is arranged on the central axis of the first cavity.
4. The high-power femtosecond pulse nonlinear compression device based on the hollow-core optical fiber according to claim 1, wherein the outer walls of the left and right sides of the bottom of the first cavity, the second cavity and the third cavity are symmetrically provided with briquetting grooves, and the briquetting grooves are long-strip-shaped and can be connected with an optical platform through fixing pieces.
5. The high-power femtosecond pulse nonlinear compression device based on the hollow-core optical fiber as claimed in claim 1, wherein water channel interfaces are arranged at the front and rear ends of the bottoms of the first cavity, the second cavity and the third cavity, the water cooling pipeline is matched with the water channel interfaces, one end of the water channel interface is connected with the water cooling pipeline, and the other end of the water channel interface can be connected with a quick-plugging water pipe.
6. The hollow-core fiber-based high-power femtosecond pulse nonlinear compression device according to claim 1, wherein the main structures of the first cavity, the second cavity and the third cavity are the same and are all in a shape of a letter "T", connecting plates are arranged among the first cavity, the second cavity and the third cavity, the number of the connecting plates is four, and the connecting mode between two adjacent connecting plates is threaded connection.
7. The high power femtosecond pulse nonlinear compression device based on the hollow-core optical fiber as recited in claim 1, wherein the incident window and the exit window both adopt brewster window slices.
8. The high power femtosecond pulse nonlinear compression device based on the hollow-core optical fiber according to any one of claims 1 to 7, wherein the materials of the first cavity, the second cavity and the third cavity are all aluminum alloy.
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