CN220232018U - Time delay control device capable of adjusting laser pulse width and excimer laser ablation device - Google Patents
Time delay control device capable of adjusting laser pulse width and excimer laser ablation device Download PDFInfo
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- CN220232018U CN220232018U CN202321891632.2U CN202321891632U CN220232018U CN 220232018 U CN220232018 U CN 220232018U CN 202321891632 U CN202321891632 U CN 202321891632U CN 220232018 U CN220232018 U CN 220232018U
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- 238000000608 laser ablation Methods 0.000 title claims abstract description 28
- 230000003287 optical effect Effects 0.000 claims abstract description 91
- 239000013307 optical fiber Substances 0.000 claims abstract description 89
- 238000005086 pumping Methods 0.000 claims abstract description 21
- 230000008878 coupling Effects 0.000 claims description 27
- 238000010168 coupling process Methods 0.000 claims description 27
- 238000005859 coupling reaction Methods 0.000 claims description 27
- 230000000903 blocking effect Effects 0.000 claims description 10
- 239000000835 fiber Substances 0.000 claims description 4
- 238000012800 visualization Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 8
- 238000011282 treatment Methods 0.000 abstract description 3
- 230000001934 delay Effects 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 241001465754 Metazoa Species 0.000 description 2
- 238000002679 ablation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000011298 ablation treatment Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
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Abstract
The utility model relates to a delay control device capable of adjusting laser pulse width and an excimer laser ablation device capable of adjusting laser pulse width, wherein a laser pumping source is respectively connected with two optical delay components. The optical delay component utilizes an increased optical path to achieve different laser delays. The difference between the two delay components is that the lengths of the arranged optical fibers are different, the optical switch is arranged at the optical inlet of the delay component, and the opening interval time of the optical switch can control whether and when the two paths of lasers are overlapped. Besides the delay control device, the excimer laser ablation device with adjustable laser pulse width also comprises a spectroscope and a laser energy meter, and can monitor the regulated output laser beam in real time, thereby ensuring the treatment effect of the whole equipment.
Description
Technical Field
The utility model belongs to the technical field of laser control equipment, and particularly relates to a delay control device capable of adjusting laser pulse width and an excimer laser ablation device.
Background
Laser pulse stretcher is commonly used in optical parametric amplifiers. It can spread the laser pulse in time domain, so as to raise the energy of laser pulse. The device typically consists of a pair of parallel placed transmissive gratings, which spread the laser pulses by introducing dispersion. The laser pulse stretcher is common in the prior art, is mainly used in the industrial manufacturing field, and the adjustable precision of the laser pulse stretcher is not required to be too high because the application scene of the laser pulse stretcher has larger requirements on the energy of the used laser. But for the medical industry, and in particular for the laser ablation industry, the laser energy required need not be excessive because the object of its implementation is a human or animal body. At the same time, however, the laser energy carried by the human body or animal cannot be too large, so that the laser ablation device in the laser ablation field has higher-precision laser energy adjusting performance.
In addition, the excimer laser commonly used in the prior art has shorter pulse width and large peak power, and is easy to age when being transmitted by adopting optical fibers. By obtaining long pulse laser output, the aging phenomenon of the optical fiber in the using process can be effectively reduced. In laser biomedical applications, long pulse excimer lasers need to transmit excimer laser beams in optical fibers, but because excimer laser pulses are narrow, peak power is high, and optical fibers are often damaged easily. In precision machining applications such as photolithography, the back-end optics are extremely expensive and high laser peak power affects their lifetime. Pulse width elongation appears to be important for these applications.
Disclosure of Invention
The utility model aims to provide a delay control device capable of adjusting laser pulse width and an excimer laser ablation device, which can widen the laser pulse width in a large range and multiple stages, and can effectively monitor the output energy of a laser in real time, thereby ensuring the energy of the output laser and further ensuring the treatment effect.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
as a first aspect of the present utility model, the present utility model discloses a delay control device capable of adjusting a pulse width of a laser, where the device includes an optical path switch, an optical delay component, and an optical path coupler, and the optical path switch, the optical delay component, and the optical path coupler are sequentially connected through an optical path. Wherein:
the optical delay component comprises a plurality of delay optical fiber discs, at least one optical fiber is placed in each delay optical fiber disc, and the lengths of the optical fibers in each delay optical fiber disc are set to be the same or different.
The optical path switch is in optical path connection with the front end of each optical fiber in each delay optical disk in the delay component, and is used for controlling the light beam to enter the front end of the optical fiber of the delay optical fiber disk in the optical delay component.
The tail ends of the optical fibers of the delay optical fiber discs are connected to an optical path coupler.
On the basis of the scheme, the optical path switch comprises a plurality of sub-optical path switches, and each sub-optical path switch is connected with the front end of the optical fiber of one delay optical fiber disc.
On the basis of the scheme, the optical path switch further comprises a beam expander, a beam shrinking lens, a focusing lens and an annular beam combining end, wherein the beam expander and the beam shrinking lens are arranged in parallel and are connected with the focusing lens in an optical path, the annular beam combining end is arranged at the output end of the focusing lens, a plurality of optical fibers of a plurality of delay optical fiber discs are stacked from outside to inside in the annular beam combining end, and the lengths of all the optical fibers of the same ring layer are consistent.
On the basis of the scheme, the optical path switch comprises a grating, a focusing lens and a square beam combining end, the grating is in optical path connection with the focusing lens, the square beam combining end is arranged at the output end of the focusing lens, a plurality of optical fibers of a plurality of delay optical fiber discs are stacked from top to bottom in the square beam combining end, and the lengths of all the optical fibers of the same flat layer are consistent.
On the basis of the scheme, a light blocking piece is arranged in front of the grating, and the light blocking piece and the grating are connected with a driving motor.
As a second aspect of the present utility model, an excimer laser ablation apparatus having an adjustable laser pulse width is disclosed. The excimer laser ablation device comprises a pumping light source, the delay control device capable of adjusting the laser pulse width, a primary laser output coupling port and a control processor. Wherein,
the pumping light source is in optical path connection with an optical path switch of the delay control device capable of adjusting the laser pulse width, and an optical path coupler of the delay control device capable of adjusting the laser pulse width is in optical path connection with a primary laser output coupling port.
The control processor is electrically connected with the pumping light source, the light path switch and the light path coupler in the delay control device capable of adjusting the laser pulse width.
On the basis of the scheme, the excimer laser ablation device further comprises a spectroscope and a laser energy meter, wherein the spectroscope is arranged on a light path between the light path coupler and the primary laser output coupling port, a first emission light path of the spectroscope is in light path connection with the primary laser output coupling port, and a second emission light path is in light path connection with the laser energy meter; the control processor is electrically connected with the laser energy meter.
On the basis of the scheme, the excimer laser ablation device is further provided with at least 2 pumping light sources, and each pumping light source corresponds to a sub-light path switch in the delay control device capable of adjusting the laser pulse width.
On the basis of the scheme, the excimer laser ablation device is further provided with at least 2 pumping light sources, and each pumping light source is correspondingly provided with a delay control device capable of adjusting laser pulse width and a primary laser output coupling port. And the system also comprises a secondary laser output coupling port, and all the primary laser output coupling ports are connected to the secondary laser output coupling port through an optical path.
On the basis of the scheme, the control processor is further provided with a visualization device and a data input device, and the spectroscope is connected with a visual light beam generating device through a light path.
The utility model has the beneficial effects that:
1) The utility model discloses a delay control device capable of adjusting laser pulse width, which can widen the laser pulse width in a large range and multiple stages, further improve the control precision of widening operation, realize the output of laser energy with various different specifications, and be suitable for ablation of different focus positions.
2) Compared with the existing delayer, the utility model occupies a small space and can achieve a larger widening effect. The material technology used by the device is mature, the stability is good, the replacement and maintenance are convenient, and the use cost of equipment is greatly reduced.
3) The utility model can monitor the output energy of the laser effectively in real time, so that the user can control the energy of the output laser in real time, and the treatment effect is further ensured.
4) The utility model has small volume, high transmission efficiency of laser and small energy loss, can realize adjustable time and space distribution aiming at the waveform of laser pulse, and has richer performance regulation and control advantages.
Drawings
Fig. 1 is a schematic structural diagram of a delay control device for adjusting laser pulse width in embodiment 1;
fig. 2 is a schematic structural diagram of a delay control device for adjusting laser pulse width in embodiment 2;
fig. 3 is a schematic structural diagram of a delay control device for adjusting laser pulse width in embodiment 3;
FIG. 4 is a schematic diagram of an excimer laser ablation apparatus with adjustable laser pulse width according to example 4;
fig. 5 is a schematic diagram of an excimer laser ablation apparatus with adjustable laser pulse width in embodiment 5.
Reference numerals: the device comprises a 1-light path switch, a 2-optical delay component, a 3-light path coupler, a 4-delay optical fiber disc, a 5-optical fiber, a 6-sub-light path switch, a 7-beam expander, an 8-beam shrinking lens, a 9-focusing lens, a 10-annular beam combining end, an 11-grating, a 12-square beam combining end, a 13-light blocking piece, a 14-driving motor, a 15-pumping light source, a 16-primary laser output coupling port, a 17-control processor, a 18-spectroscope, a 19-laser energy meter, a 20-visual beam generating device and a 21-secondary laser output coupling port.
Detailed Description
The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.
The embodiments of the delay control device and the laser device capable of adjusting the laser pulse width in the utility model are shown in fig. 1-4.
Example 1: the utility model discloses a delay control device capable of adjusting laser pulse width, which can perform delay superposition on laser pulse width and flexibly control output laser energy, so that the device is suitable for ablation of different focus positions. The device comprises an optical path switch 1, an optical delay component 2 and an optical path coupler 3, wherein the optical path switch 1, the optical delay component 2 and the optical path coupler 3 are sequentially connected through optical paths. Wherein:
the optical delay assembly 2 comprises a plurality of delay fiber trays 4, in this embodiment 2 delay fiber trays 4. An optical fiber 5 is placed in each delay optical fiber disc 4, and the optical fiber 5 is wound on the disc body of the delay optical fiber disc 4. The lengths of the optical fibers 5 in each of the optical fiber trays are set to be the same or different, and the optical fibers 5 on one of the delay optical fiber trays 4 in this embodiment are set to be 60 meters, and the optical fibers 5 on the other delay optical fiber tray 4 are set to be 20 meters. The delay fiber tray 4 may be one tray body, or may be a plurality of tray bodies in combination, which is not limited herein.
The optical path switch 1 is used for controlling the laser beam emitted by the pumping light source 15, the optical path switch 1 comprises 2 sub-optical path switches 6, and each sub-optical path switch 6 is connected with the front end of the optical fiber 5 of one time-delay optical fiber disc 4 in an optical path. In this embodiment, 2 pump light sources 15 are configured, and each pump light source 15 corresponds to one sub-optical path switch 6. Different pulse width widening effects can be realized by controlling different settings of the opening interval time of the sub-optical path switch 6 to control whether and when two paths of lasers are overlapped. In addition, the present utility model may also use one pumping light source 15 to guide the incident light beam to the 2 sub-optical path switches 6 by using a laser beam splitter or a mirror provided in the optical path switch, respectively. Of course, the present utility model is not limited to laser beam splitters or mirrors, and the purpose of the present utility model is to direct an incident beam onto an optical path that needs to be activated separately or simultaneously, and any single device or multiple components that can achieve the above purpose are within the scope of the present utility model.
The tail end light paths of the optical fibers 5 of the delay optical fiber discs 4 are connected to the light path coupler 3, and laser beams transmitted by the optical fibers 5 are combined through the coupler to be used as output laser of the excimer laser ablation device with adjustable laser pulse width for ablation treatment of focus.
The pulse width superposition is performed by a physical delay method by increasing the optical path. The optical pulse can be delayed by 3.3ns when the optical path is increased by 1m, and compared with the existing delay device, the optical pulse delay device occupies a small space, so that a larger widening effect can be achieved. And each delay optical fiber disc 4 can be configured with a pumping light source 15 with the same or different types, so that superposition of a plurality of pulses can be realized, and pulse width broadening with a larger range and multiple stages can be realized.
In addition, the mounting mode of the delay optical fiber disc 4 is detachable, and disc bodies wound with optical fibers 5 with different specifications and lengths can be replaced according to actual needs, so that the widening range of the device is further improved.
Example 2: the difference between this embodiment and embodiment 1 is that one pump light source 15 is configured in this embodiment, and a plurality of optical fibers 5 are wound on the disk body of each delay optical fiber disk 4, and the lengths of the plurality of optical fibers 5 are the same or different, and in this embodiment, a scheme in which the lengths of the plurality of optical fibers 5 are the same is adopted. In addition, the optical path switch 1 comprises a beam expander 7, a beam contractor 8, a focusing lens 9 and an annular beam combining end 10, wherein the beam expander 7 and the beam contractor 8 are arranged in parallel and are connected with the focusing lens 9 in an optical path, the annular beam combining end 10 is arranged at the output end of the focusing lens 9, and a plurality of optical fibers 5 of 2 delay optical fiber discs 4 are stacked in the annular beam combining end 10 from outside to inside in an annular mode. The optical fibers 5 in the outer ring layer A area are all the optical fibers 5 on the 60-meter time-delay optical fiber disk 4, and the optical fibers 5 in the inner ring layer B area are all the optical fibers 5 on the 20-meter time-delay optical fiber disk 4.
In this embodiment, the beam expander 7 and the beam contractor 8 are used to adjust the size of the circular light spot incident on the annular beam-combining end 10, and the light path in the optical fiber 5 of the corresponding delay optical fiber disk 4 is activated by adjusting the size of the light spot. If the light spot is enlarged to irradiate the area A, the focused laser beam enters the corresponding optical fiber 5, and the optical path of the 60-meter delay optical fiber disk 4 is started. Similarly, when the light spot is reduced to irradiate the area B, the light path of the 20-meter delay optical fiber disc 4 is started; the light spot irradiates the A, B area simultaneously, and then the light paths of the delay optical fiber disc 4 of 60 meters and 20 meters are started simultaneously. The laser beam emitted by the pumping light source 15 is controlled to enter the beam expander 7 or the beam contractor 8 to adjust the size of the light spot, so that different setting of the opening interval time can be realized, whether two paths of laser are overlapped or not and when the two paths of laser are overlapped can be controlled, and different pulse width widening effects can be realized.
The utility model can use one pumping light source 15, and utilize a laser beam splitter or a reflecting mirror arranged in an optical path switch to guide incident light beams to the beam expander 7 and the beam contractor 8 respectively or to the beam expander 7 and the beam contractor 8 simultaneously, and can use 2 pumping light sources 15, and each pumping light source 15 can guide the incident light beams to the beam expander 7 and the beam contractor 8 respectively. Of course, the present utility model is not limited to laser beam splitters or mirrors, and the purpose of the present utility model is to direct an incident beam onto an optical path that needs to be activated separately or simultaneously, and any single device or multiple components that can achieve the above purpose are within the scope of the present utility model.
Example 3: the difference between this embodiment and embodiment 2 is that, in this embodiment, the optical path switch 1 includes a light blocking sheet 13, a grating 11, a focusing lens 9, and a square beam combining end 12, where the light blocking sheet 13 is disposed on an optical path at the front end of the grating 11, the grating 11 is in optical path connection with the focusing lens 9, the square beam combining end 12 is disposed at the output end of the focusing lens 9, multiple optical fibers 5 of 2 delay optical fiber trays 4 are stacked from top to bottom in the square beam combining end 12, the optical fibers 5 in the upper layer a area are all the optical fibers 5 on the 60 m delay optical fiber tray 4, and the optical fibers 5 in the lower layer B area are all the optical fibers 5 on the 20 m delay optical fiber tray 4. The rotation of the light blocking sheet 13 and the grating 11 is controlled by a driving motor 14.
In this embodiment, the light blocking piece 13 and the grating 11 are utilized to scan the grating 11, so as to adjust the size of a square light spot incident on the square beam combining end 12, and the light path in the optical fiber 5 of the corresponding delay optical fiber disc 4 is activated by adjusting the size of the light spot. If the light spot is enlarged to irradiate the area A, the focused laser beam enters the corresponding optical fiber 5, and the optical path of the 60-meter delay optical fiber disk 4 is started. Similarly, when the light spot is reduced to irradiate the area B, the light path of the 20-meter delay optical fiber disc 4 is started; the light spot irradiates the A, B area simultaneously, and then the light paths of the delay optical fiber disc 4 of 60 meters and 20 meters are started simultaneously. The rotation speed of the light blocking sheet 13 and the grating 11 is controlled through the motor, so that the size of the light spot diffracted by the grating 11 is controlled, different setting of the opening interval time is realized, whether the two paths of lasers are overlapped or not and when the two paths of lasers are overlapped can be controlled, and different pulse width widening effects are realized.
Example 4: the embodiment provides an excimer laser ablation device with adjustable laser pulse width, which comprises a pumping light source 15, a delay control device with adjustable laser pulse width, a spectroscope 18, a laser energy meter 19, a primary laser output coupling port 16 and a control processor 17. Wherein,
the pumping light source 15 is in optical path connection with the optical path switch 1 of the delay control device capable of adjusting the laser pulse width, and the optical path coupler 3 of the delay control device capable of adjusting the laser pulse width is in optical path connection with the primary laser output coupling port 16. The primary laser output coupling port 16 is configured with an adapter port that can be adapted to an existing disposable laser ablation catheter and output a laser beam.
The beam splitter 18 is disposed on the optical path between the optical path coupler 3 and the primary laser output coupling port 16, and the first emission optical path of the beam splitter 18 is in optical path connection with the primary laser output coupling port 16, and the second emission optical path is in optical path connection with the laser energy meter 19. The laser energy meter 19 can monitor the energy of the output laser beam, determine whether it meets the preset requirement, and adjust. The beam splitter 18 is connected to a visible light beam generating device 20 through a light path, and is configured to overlap with the laser light beam in the light path to provide visibility.
The control processor 17 is electrically connected with the pump light source 15, the light path switch 1, the light path coupler 3 and the laser energy meter 19 in the delay control device capable of adjusting the laser pulse width.
The control processor 17 is provided with visualization means and data input means for presenting the relevant data information of the device to a user via the visualization means and for modifying the relevant control parameters of the device via the data input means by inputting the data information.
Example 5: the difference between this embodiment and embodiment 4 is that the excimer laser ablation apparatus is configured with 2 pump light sources 15, and each pump light source 15 is correspondingly configured with a delay control device capable of adjusting laser pulse width and a primary laser output coupling port 16. And further includes a secondary laser output coupling port 21, all of the primary laser output coupling ports 16 being connected to the secondary laser output coupling port 21 by an optical path.
Finally, it should be noted that: in the description of the present utility model, it should be noted that the positional or positional relationship indicated by the terms such as "vertical", "upper", "lower", "horizontal", "front", "rear", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
Claims (10)
1. The utility model provides a time delay controlling means of adjustable laser pulse width, its characterized in that, the device includes light path switch, optical delay subassembly, light path coupler, light path switch, optical delay subassembly, light path coupler loop through the light path and connect, wherein:
the optical delay component comprises a plurality of delay optical fiber discs, at least one optical fiber is placed in each delay optical fiber disc, and the lengths of the optical fibers in each delay optical fiber disc are set to be the same or different;
the optical path switch is in optical path connection with the front end of each optical fiber of each delay optical fiber disc in the optical delay assembly;
the tail ends of the optical fibers of the delay optical fiber discs are connected to an optical path coupler.
2. The delay control device of claim 1 wherein the optical switch comprises a plurality of side-by-side sub-optical switches, each sub-optical switch being optically coupled to the front end of an optical fiber of a delay fiber optic disc.
3. The delay control device of claim 1, wherein the optical path switch comprises a beam expander, a beam contractor, a focusing lens and an annular beam converging end, wherein the beam expander and the beam contractor are arranged in parallel and are both in optical path connection with the focusing lens, the annular beam converging end is arranged at the output end of the focusing lens, and optical fibers of a plurality of delay optical fiber discs are stacked in the annular beam converging end from outside to inside.
4. The delay control device of claim 1, wherein the optical path switch comprises a grating, a focusing lens and a square beam combining end, the grating is in optical path connection with the focusing lens, the square beam combining end is arranged at the output end of the focusing lens, and the optical fibers of the plurality of delay optical fiber discs are stacked from top to bottom in the square beam combining end.
5. The delay control device of claim 4, wherein a light blocking sheet is arranged in front of the grating, and the light blocking sheet and the grating are connected with a driving motor.
6. An excimer laser ablation apparatus with adjustable laser pulse width, characterized in that: the excimer laser ablation device comprises a pumping light source, the delay control device capable of adjusting the laser pulse width according to any one of claims 1-5, a primary laser output coupling port and a control processor, wherein,
the pumping light source is in optical path connection with an optical path switch of the delay control device capable of adjusting the laser pulse width, and an optical path coupler of the delay control device capable of adjusting the laser pulse width is in optical path connection with a primary laser output coupling port;
the control processor is electrically connected with the pumping light source, the light path switch and the light path coupler in the delay control device capable of adjusting the laser pulse width.
7. The excimer laser ablation apparatus of claim 6, further comprising a beam splitter and a laser energy meter, wherein the beam splitter is disposed on an optical path between the optical path coupler and the primary laser output coupling port, and wherein a first emission optical path of the beam splitter is in optical path connection with the primary laser output coupling port, and a second emission optical path is in optical path connection with the laser energy meter; the control processor is electrically connected with the laser energy meter.
8. The excimer laser ablation apparatus of claim 7, wherein the excimer laser ablation apparatus is configured with at least 2 pump light sources, and each pump light source corresponds to a sub-optical path switch in the delay control apparatus of claim 2.
9. The excimer laser ablation apparatus of claim 7, wherein the excimer laser ablation apparatus is configured with 2 pump light sources, and each pump light source is correspondingly configured with a delay control device for adjusting the laser pulse width and a primary laser output coupling port, and further comprising a secondary laser output coupling port, all of the primary laser output coupling ports being connected to the secondary laser output coupling port by an optical path.
10. The excimer laser ablation apparatus of claim 7, wherein the control processor is configured with a visualization device and a data input device, and the beam splitter is connected to a visible light beam generating device via an optical path.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321891632.2U CN220232018U (en) | 2023-07-18 | 2023-07-18 | Time delay control device capable of adjusting laser pulse width and excimer laser ablation device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321891632.2U CN220232018U (en) | 2023-07-18 | 2023-07-18 | Time delay control device capable of adjusting laser pulse width and excimer laser ablation device |
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| CN220232018U true CN220232018U (en) | 2023-12-22 |
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| CN202321891632.2U Active CN220232018U (en) | 2023-07-18 | 2023-07-18 | Time delay control device capable of adjusting laser pulse width and excimer laser ablation device |
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