CN115411597A - Double-peak output laser therapeutic instrument based on thulium-doped optical fiber - Google Patents
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- 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
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
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- A61B18/18—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves
- A61B18/20—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using laser
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- 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
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- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
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- 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
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
- H01S3/0813—Configuration of resonator
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/105—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the mutual position or the reflecting properties of the reflectors of the cavity, e.g. by controlling the cavity length
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
- H01S3/1601—Solid materials characterised by an active (lasing) ion
- H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
- H01S3/1616—Solid materials characterised by an active (lasing) ion rare earth thulium
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- A61B2018/00315—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for treatment of particular body parts
- A61B2018/00452—Skin
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Abstract
The invention discloses a double-peak output laser therapeutic instrument based on thulium-doped optical fibers, which comprises a laser system, a switching device and a transmission system, wherein the laser system is connected with the switching device; the laser system is used for generating laser with the wavelength of a first wavelength or a second wavelength and comprises a first wavelength high-reflection mirror, a laser generator, a second wavelength high-reflection grating, a wavelength division multiplexer, a thulium-doped optical fiber, a second wavelength partial reflection grating and a first wavelength partial reflection grating; the laser generator is sequentially connected with the second wavelength high-reflection grating and the wavelength division multiplexer through optical fibers, the first wavelength high-reflection mirror is arranged at the tail fiber end of the wavelength division multiplexer, and the wavelength division multiplexer is sequentially connected with the thulium-doped optical fibers, the second wavelength partial reflection grating and the first wavelength partial reflection grating through the optical fibers; the laser generator is used for generating laser of a third wavelength; the switching device is used for switching the output of the laser system into laser with a second wavelength or a first wavelength.
Description
Technical Field
The invention relates to the field of medical instruments, in particular to a dual-output laser therapeutic apparatus based on thulium-doped optical fibers.
Background
Water molecules are the main components in biological tissues and absorb laser light with different wavelengthsThe coefficient of absorption is an important factor of laser biological thermal effect, the absorption coefficient of water molecules is increased along with the increase of wavelength, and the lowest absorption coefficient in a visible light wave band is only 10 -4 cm -1 But an absorption coefficient of up to 600cm at a wavelength band of 1.94 μm -1 The 1.94 mu m wave band can realize shallow biological tissue penetration depth and good thermal coagulation hemostasis effect, so that in clinical application, 2 mu m wave band laser transmitted by low-loss optical fiber is combined with an endoscope, higher operation precision can be realized, and good safety is achieved.
It was found that fat has characteristic absorption peaks at a 1.72 μm band, water has characteristic absorption peaks at 2 μm and 1.94 μm bands, and the vicinity of 1.72 μm is the vicinity of a valley between the two absorption peaks of water at 2 μm and 1.94 μm, and the characteristic absorption peaks of fat are more intense than water. For biological tissues containing a large amount of water molecules, the 1.7 mu m wave band has lower Rayleigh scattering in the biological tissues, the energy loss of incident light of a 1.7 mu m wave band light source is lower, and the 1.7 mu m wave band ultrafast fiber laser light source can be used for multi-photon fluorescence microscopic imaging.
The 1.7 mu m wave band is positioned near the higher peak wave band of the absorption peaks of fat and collagen, so the 1.7 mu m wave band light source is widely applied to the fields of Optical Coherence Tomography (OCT), multi-photon fluorescence microscopy (MFLM), laser surgery and the like. The 1.7 μm band is also near the band where the characteristic absorption peak of the C-H covalent bond is located, and the C-H covalent bond is the main bonding mode of fat, so that the laser surgery of sebaceous glands is also suitable.
The american food and drug administration approved AviClear laser equipment for mild, moderate, and severe acne treatment was announced by inc. Company, curi, curiban, curra, california, 03-25 d, 2022. The AviClear laser device is a 1726nm laser treatment device with the diameter of 1.72 mu m, provides a safe and prescription-free treatment scheme for acne, and in addition to reducing the existing acne, clinical trials show that after the operation using the AviClear laser device, later-stage pox attacks are shorter, lower in intensity and rarer, and the acne removal effect continues to improve over time, thus proving the long-term efficacy of the laser therapy, and no pain relieving means is used or pain is required by clinical trial participants.
For lasers in the 1.94um band, several companies developed products and obtained medical licenses, with the main applications focusing on dermatology: repairing pockmarks and scars, tightening skin, reducing pores, improving skin color, and carrying out noninvasive introduction of skin medicaments with output power of about 10W and continuous output; urology department: tissue cutting and laser lithotripsy, output power 120W, continuous and pulse 2 modes.
The following problems exist in the prior art: 1. fat absorption peak at 1.72 μm wave band, water absorption peak at 1.94 μm wave band, called double peak, 1.72 μm and 1.94 μm wave band laser are generated by thulium doped fiber laser, however, the prior art laser therapeutic apparatus uses one peak in double peak alone, either 1.94 μm single wavelength output or 1.72 μm single wavelength output; 2. human tissue is essentially composed of water and C-H compounds, for example, the mechanism of acne treatment is targeted treatment on sebaceous glands, the sebaceous glands are positioned in the middle dermis, the lower epidermis layer and the dermis layer contain 65% of water, the target tissue can pass through the tissue rich in water firstly, and the water absorbs the laser with the wave band of 1.72 mu m, although fat is not absorbed strongly, the laser can lose part when reaching the sebaceous glands and cannot play the maximum role; 3. the 1.94 μm wave band is the absorption peak of water, but the 1.94 μm wave band laser can not effectively distinguish tissues, and the aim of targeted therapy of sebaceous glands can not be achieved.
Disclosure of Invention
In order to solve the problems, the application provides a double-peak output laser therapeutic instrument based on thulium-doped optical fibers, and the specific scheme is as follows: the system comprises a laser system, a switching device and a transmission system;
the laser system is used for generating laser with the wavelength of a first wavelength or a second wavelength and inputting the laser to the transmission system;
the laser system comprises a first wavelength high-reflection mirror, a laser generator, a second wavelength high-reflection grating, a wavelength division multiplexer, a thulium-doped optical fiber, a second wavelength partial reflection grating and a first wavelength partial reflection grating;
the laser generator is sequentially connected with the second wavelength high-reflection grating and the wavelength division multiplexer through optical fibers, the first wavelength high-reflection mirror is arranged at the tail fiber end of the wavelength division multiplexer, and the wavelength division multiplexer is sequentially connected with the thulium-doped optical fiber, the second wavelength partial reflection grating and the first wavelength partial reflection grating through the optical fibers; the first wavelength high reflection mirror and the first wavelength partial reflection grating form a first resonant cavity, and the second wavelength high reflection grating and the second wavelength partial reflection grating form a second resonant cavity;
the laser generator is used for generating laser with a third wavelength; the wavelength division multiplexer is used for high reflection of the laser with the second wavelength and the laser with the third wavelength and high transmission of the laser with the first wavelength;
the switching device is used for switching the output of the laser system into laser with a second wavelength or a first wavelength.
Preferably, the first wavelength is selected from the range of 1.9 μm to 2.0 μm, and the second wavelength is selected from the range of 1.7 μm to 1.8 μm.
Preferably, the first wavelength is 1.94 μm and the second wavelength is 1.72 μm.
Preferably, the third wavelength is selected from the range of 1.9 μm to 2.0 μm, and the laser generator is an erbium doped fiber laser or a semiconductor laser.
Preferably, the third wavelength is 1.5 μm, and the laser generator is a 1.5 μm erbium-doped fiber laser or a 793nm semiconductor laser.
Preferably, the switching device is an optical gate and is disposed between the first wavelength high-reflection mirror and the wavelength division multiplexer.
Preferably, when the switching device is closed, the first wavelength high-reflection mirror is shielded, so that the final output of the laser system is laser light with a second wavelength;
when the switching device is opened, the first wavelength high-reflection mirror participates in the light path, so that the final output of the laser system is laser with the first wavelength.
Preferably, when the switching device is closed, the third wavelength laser generated by the laser generator enters the wavelength division multiplexer through the second wavelength high-reflection grating, is reflected to the thulium-doped optical fiber, is absorbed by the thulium-doped optical fiber and realizes population inversion, and the light wave after being excited and emitted is reflected and oscillated in the second resonant cavity formed by the second wavelength high-reflection grating and the second wavelength partial-reflection grating, and finally the second wavelength laser is output to the transmission system.
Preferably, when switching device opens, the third wavelength laser that laser generator produced enters into wavelength division multiplexer through the high anti-grating of second wavelength, and then is reflected to thulium-doped fiber, is absorbed and realizes the population inversion by thulium-doped fiber, and the light wave after the stimulated emission is in reflection, oscillation in the first resonant cavity that first wavelength high reflection mirror and first wavelength partial reflection grating constitute finally obtain first wavelength laser output and transmit system.
Preferably, the optical coupler further comprises a coupling lens, which is arranged between the first wavelength high-reflection mirror and the wavelength division multiplexer, and is used for realizing mode matching of the first resonant cavity.
Preferably, the transmission system comprises an optical fiber and a collimator.
Preferably, the second wavelength high-reflection grating, the second wavelength partial reflection grating and the first wavelength partial reflection grating are all bragg gratings.
The beneficial effects of the invention are:
1. the application provides a two peak output laser therapeutic instrument based on mix thulium optic fibre has realized adopting same gain optic fibre output two peak wavelength laser, including the 1.94 mu m wave band laser of corresponding water absorption peak and the 1.72 mu m wave band laser of corresponding fat absorption peak, has expanded the application range who mixes thulium laser, for example can be applied to latent laser dissolving fat, laser therapy atherosclerosis etc..
2. The application provides a two peak output laser therapeutic instrument based on thulium-doped optical fiber can realize 1.72 mu m and 1.94 mu m wave band laser and export alternately, and the time interval of alternately exporting is the mu s magnitude, and can select laser instrument output mode according to target tissue type and distribution, for example wavelength, pulse width, repetition frequency etc. thereby can shine to different target tissues effectively, make the treatment more accurate, high-efficient.
3. The application provides a pair of peak output laser therapeutic instrument based on thulium-doped optical fiber can share same pump source and realize multiband laser output for overall structure is compacter, has reduced equipment cost, has improved equipment availability factor.
Drawings
FIG. 1A is a schematic diagram of a dual output laser treatment apparatus based on thulium doped fiber according to one embodiment of the present invention, showing the output laser wavelength of 1.94 μm;
FIG. 1B is a schematic diagram of a dual output laser treatment device based on thulium doped fiber according to an embodiment of the present invention, wherein the laser output wavelength is 1.72 μm;
fig. 2 is a schematic structural diagram of a dual-output laser therapeutic apparatus based on thulium-doped optical fiber according to another embodiment of the present invention.
Wherein: 100. a laser system; 101. a first wavelength high reflection mirror; 102. a coupling lens; 103. a first transmission optical fiber; 104. a second transmission optical fiber; 105. a second wavelength high-reflection grating; 107. a third transmission fiber; 108. a laser generator; 109. a wavelength division multiplexer; 110. a thulium doped optical fiber; 112. a second wavelength partially reflective grating; 113. a first wavelength partially reflective grating;
200. switching means (optical shutter);
300. a transmission system; 301. an optical fiber; 302. a collimator;
400. a second wavelength laser generating device; 401. a second pump laser; 402. a second wavelength reflective Bragg grating; 403. a second thulium doped gain fiber; 404. a second wavelength partially reflective Bragg grating; 405. a wavelength division multiplexer;
500. a first wavelength laser generating device; 501. a first pump laser; 502. a first wavelength reflective bragg grating; 503. a first thulium doped gain fiber; 504. the first wavelength partially reflects the bragg grating.
Detailed Description
The embodiments of the present application are described in further detail below, and it is apparent that the described examples are only a part of the examples of the present application, and are not exhaustive of all the examples. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. It will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit of the invention, and these are to be considered within the scope of the invention.
Referring to fig. 1, a dual-output laser treatment device based on thulium doped fiber according to one embodiment of the present invention is shown, which comprises the following components: laser system 100, switching device 200 and transmission system 300.
The laser system 100 is operative to generate laser light having a second or first wavelength, the first wavelength being selected from a range of 1.9 μm to 2.0 μm, and the second wavelength being selected from a range of 1.7 μm to 1.8 μm. In the present embodiment, it is preferable that the first wavelength is 1.94 μm and the second wavelength is 1.72 μm.
Specifically, in the present embodiment, the laser system 100 may include a first wavelength high-reflection mirror 101, a coupling lens 102, a first transmission fiber 103, a second transmission fiber 104, a second wavelength high-reflection grating 105, a third transmission fiber 107, a laser generator 108, a wavelength division multiplexer 109, a thulium-doped fiber 110, a second wavelength partial reflection grating 112, a first wavelength partial reflection grating 113, and the like. The first wavelength high-reflection mirror 101 is used for totally reflecting the laser with the first wavelength, the second wavelength high-reflection grating 105 is used for totally reflecting the laser with the second wavelength, the second wavelength partial reflection grating 112 is used for partially reflecting and partially transmitting the laser with the second wavelength, and the first wavelength partial reflection grating 113 is used for partially reflecting and partially transmitting the laser with the first wavelength. In a preferred embodiment, the second wavelength highly reflective grating 105, the second wavelength partially reflective grating 112, and the first wavelength partially reflective grating 113 are implemented by using a highly reflective bragg grating and a partially reflective bragg grating, respectively.
Wherein an erbium doped fiber laser is used as the laser generator 108 for generating laser light of a third wavelength, which may be selected from the range of 1.5 μm to 1.6 μm. In this embodiment, the third wavelength is preferably 1.5 μm and the laser generator 108 is a 1.5 μm erbium doped fiber laser. The laser with the third wavelength is absorbed by the thulium-doped fiber 110 to realize population inversion, and the laser is oscillated for multiple times in the resonant cavity to output laser with a wavelength of 1.72 μm or 1.94 μm. Optionally, in other embodiments of the present invention, a 793nm semiconductor laser may be used instead of the erbium-doped fiber laser as the laser generator 108, which is used to generate laser with a wavelength of 793nm, and the laser may also be absorbed by the thulium-doped fiber 110 to implement population inversion, and after multiple oscillations in the resonant cavity, the laser may finally output 1.72 μm or 1.94 μm.
In the present embodiment, the switching device 200 may be a shutter, and for example, a shutter that can switch circuits, such as a mechanical shutter, an electro-optical switch, and an acousto-optical switch, may be used. A switching device, i.e., a shutter 200, is provided between the first wavelength high-reflection mirror 101 and the wavelength division multiplexer 109, and is used for switching the laser beam of which the output of the laser system 100 is 1.72 μm or 1.94 μm.
The transmission system 300 is used for guiding the laser light with a specific wavelength output by the laser system 100 to the treatment end, and may include: an optical fiber 301, which may be, for example, an undoped pure silica fiber, for transmitting laser light; and a collimator 302 for collimating the laser light into a parallel beam.
The operation of the laser treatment apparatus will be described in detail below.
In a first application scenario, as shown in fig. 1A, the laser therapeutic apparatus can be controlled to output laser with a first wavelength, i.e. 1.94 μm, and it is first required to open the shutter 200, at which time the shutter 200 does not block the first wavelength high-reflection mirror 101, and the first wavelength high-reflection mirror 101 will participate in the optical path.
The laser generator 108 outputs laser with a wavelength of 1.5 μm, and the laser enters the second wavelength high reflection grating 105 through the third transmission fiber 107, and the second wavelength high reflection grating 105 is used for reflecting the laser with a second wavelength, namely 1.72 μm; the laser with the wavelength of 1.5 μm passes through the second wavelength high-reflection grating 105, and then enters the wavelength division multiplexer 109 through the second transmission fiber 104.
In this embodiment, the wavelength division multiplexer 109 has the characteristic of high reflectivity for the laser with the third wavelength of 1.5 μm and the laser with the second wavelength of 1.72 μm, and high transmissivity for the laser with the first wavelength of 1.94 μm, and can be implemented by using an antireflection film or other similar technologies. The laser light with the wavelength of 1.5 μm is reflected by the wavelength division multiplexer 109 into the thulium doped fiber 110 and absorbed by the thulium doped fiber 110. The thulium-doped fiber 110 is a gain medium portion of the laser system 100, which can realize population inversion, and the light waves emitted by the excitation are oscillated to form laser emission.
Under normal conditions, because the radiation intensity of the thulium ions in the excited state is much higher than 1.72 μm at 1.94 μm, 1.94 μm is in competitive advantage, and the laser light of 1.72 μm is suppressed, so in this embodiment, the laser light of 1.94 μm will start to oscillate in the first resonant cavity formed by the first wavelength high-reflection mirror 101 and the first wavelength partial reflection grating 113, and output the laser light of 1.94 μm to the transmission system 300 after multiple oscillations. In the transmission system 300, the laser beam enters a collimator 302 through an optical fiber 301, and is collimated to output a laser beam having a first wavelength, i.e., 1.94 μm.
Fig. 1B shows another application scenario where the laser output wavelength of the laser treatment apparatus can be controlled to be the second wavelength, i.e. 1.72 μm, and the switching device 200 is closed to shield the first wavelength high-reflection mirror 101 and exclude the first wavelength high-reflection mirror 101 from the optical path. Then, as in the former case, the laser light with the wavelength of 1.5 μm is still output from the laser generator 108, passes through the second wavelength high-reflection grating 105 via the third transmission fiber 107, enters the wavelength division multiplexer 109 via the second transmission fiber 104, is reflected to the thulium-doped fiber 110 by the wavelength division multiplexer 109, is absorbed by the thulium-doped fiber 110, realizes population inversion, and is excited to emit light. However, in this case, since the first wavelength high-reflection mirror 101 is shielded by the switching device 200, the loss at the first wavelength 1.94 μm becomes infinite, and thus the laser light of 1.94 μm is suppressed, so that the laser light of the second wavelength 1.72 μm is in competitive advantage, and the laser light starts to oscillate in the second resonator formed by the second wavelength high-reflection grating 105 and the second wavelength partial reflection grating 112, and outputs the laser light of 1.72 μm to the transmission system 300 after multiple oscillations. In the transmission system 300, the laser beam enters a collimator 302 through an optical fiber 301, and the laser beam is collimated to output a second wavelength laser beam, i.e., a 1.72 μm wavelength laser beam.
As mentioned above, according to the dual-peak output laser therapeutic apparatus based on the thulium-doped optical fiber, the same gain optical fiber is adopted to output the dual-peak wavelength laser, including the 1.94 μm waveband laser corresponding to the water absorption peak and the 1.72 μm waveband laser corresponding to the fat absorption peak, so that the application range of the thulium-doped laser is expanded, and the thulium-doped laser therapeutic apparatus can be applied to potential laser fat dissolving, laser therapy of atherosclerosis and the like. Furthermore, according to the dual-output laser therapeutic apparatus based on the thulium-doped optical fiber, the alternating output of the laser with the wavelength of 1.72 microns and the laser with the wavelength of 1.94 microns can be realized, namely the dual-wavelength laser output is realized, so that irradiation can be effectively carried out on different target tissues, and the treatment is more accurate and efficient. Finally, according to the dual-peak output laser therapeutic apparatus based on the thulium-doped optical fiber, the output of the laser with the wavelength of 1.72 microns and the output of the laser with the wavelength of 1.94 microns can be realized by sharing the same pumping source, so that the whole structure is more compact, the equipment cost is reduced, the equipment use efficiency is improved, and the dual-wavelength is output through the same optical fiber, so that the use of a user is more convenient.
Fig. 2 shows a dual-output laser treatment apparatus based on thulium-doped fiber according to another embodiment of the present invention, in which two sets of pump sources and two gain fibers are used to construct two sets of laser generators, a second 1.72 μm laser generator 400 and a first 1.94 μm laser generator 500, instead of the laser system 100 in the embodiment of fig. 1.
Specifically, in this embodiment, the laser therapeutic apparatus includes a second wavelength laser generator 400 and a first wavelength laser generator 500, where the second wavelength laser generator 400 includes a first pump laser 401, a second wavelength reflection bragg grating 402, a second thulium-doped gain fiber 403, a second wavelength partial reflection bragg grating 404, and a second wavelength division multiplexer 405; the first wavelength laser generator 500 includes a second pump laser 501, a first wavelength reflective bragg grating 502, a first thulium-doped gain fiber 503, and a first wavelength partially reflective bragg grating 504.
The first pump laser 401 and the second pump laser 501 are used to generate laser light of a third wavelength. In a preferred embodiment, the first pump laser 401 and the second pump laser 501 may be 1.5 μm fiber lasers for generating 1.5 μm laser light. Alternatively, in other embodiments, the first pump laser 401 and the second pump laser 501 may also be 793nm semiconductor lasers for generating 793nm laser light.
In this embodiment, the first pump laser 401 in the second wavelength laser generating device 400 emits laser light of 1.5 μm, enters the second thulium-doped gain fiber 403 through the second wavelength reflection bragg grating 402, is absorbed by the second thulium-doped gain fiber 403 to realize population inversion, starts oscillation in a third resonant cavity formed by the second wavelength reflection bragg grating 402 and the second wavelength partial reflection bragg grating 404, outputs the laser light of the second wavelength, i.e., 1.72 μm, to the second wavelength division multiplexer 405 after multiple oscillations, and then transmits the laser light to the transmission system 300 through the second wavelength division multiplexer 405.
Similarly, the second pump laser 501 in the first wavelength laser generator 500 pumps laser light to emit 1.5 μm laser light, enters the first thulium-doped gain fiber 503 through the first wavelength reflection bragg grating 502, is absorbed by the first thulium-doped gain fiber 503 to realize population inversion, starts oscillation in the fourth resonant cavity formed by the first wavelength reflection bragg grating 502 and the first wavelength partial reflection bragg grating 504, outputs the first wavelength laser light, i.e., 1.94 μm laser light, to the second wavelength division multiplexer 405 after multiple oscillations, and then transmits the first wavelength laser light, i.e., 1.94 μm laser light, to the transmission system 300 through the second wavelength division multiplexer 405.
In this embodiment, the wavelength division multiplexer 405 has the characteristics of high reflectivity for the laser with the second wavelength of 1.72 μm and high transmissivity for the laser with the first wavelength of 1.94 μm, and can be implemented by using an antireflection film or other similar technologies. When the second wavelength laser generator 400 and the first wavelength laser generator 500 operate simultaneously, the wavelength division multiplexer 405 may be configured to combine the received second wavelength laser and the first wavelength laser, and transmit the combined laser including the second wavelength and the first wavelength to the transmission system 300, where the laser treatment apparatus may simultaneously output the laser with the second wavelength of 1.72 μm and the laser with the first wavelength of 1.94 μm. When one of the second wavelength laser generating device 400 and the first wavelength laser generating device 500 is controlled to operate and the other is controlled to be off by a switching control device (not shown in the drawing), the second wavelength division multiplexer 405 receives only the laser light of one of the second wavelength and the first wavelength and transmits the laser light to the transmission system 300, and the laser treatment apparatus outputs only the laser light of one of the second wavelength 1.72 μm and the first wavelength 1.94 μm.
Compared with the embodiment shown in fig. 1, the embodiment shown in fig. 2 has the advantages of relatively simple technology and easy realization besides obtaining the same technical effects as described above, and can realize the simultaneous output of laser light with the wavelength of 1.72 μm and the wavelength of 1.94 μm; however, the embodiment shown in fig. 2 has the disadvantages that two sets of pump sources and two gain fibers are required, the volume and cost of the device are greatly increased, and the overall structure and control method are more complicated.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (10)
1. A dual-output laser therapeutic apparatus based on thulium-doped optical fiber is characterized by comprising a laser system (100), a switching device (200) and a transmission system (300);
the laser system (100) is used for generating laser with a first wavelength or a second wavelength and inputting the laser to the transmission system (300);
the laser system (100) comprises a first wavelength high-reflection mirror (101), a laser generator (108), a second wavelength high-reflection grating (105), a wavelength division multiplexer (109), a thulium-doped optical fiber (110), a second wavelength partial reflection grating (112) and a first wavelength partial reflection grating (113);
the laser generator (108) is sequentially connected with the second wavelength high-reflection grating (105) and the wavelength division multiplexer (109) through optical fibers, the first wavelength high-reflection mirror (101) is arranged at the tail fiber end of the wavelength division multiplexer (109), and the wavelength division multiplexer (109) is further sequentially connected with the thulium-doped optical fiber (110), the second wavelength partial reflection grating (112) and the first wavelength partial reflection grating (113) through the optical fibers; the first wavelength high reflection mirror (101) and the first wavelength partial reflection grating (113) form a first resonant cavity, and the second wavelength high reflection grating (105) and the second wavelength partial reflection grating (112) form a second resonant cavity;
the laser generator (108) is used for generating laser light with a third wavelength; the wavelength division multiplexer (109) is used for highly reflecting the laser with the second wavelength and the third wavelength and highly transmitting the laser with the first wavelength;
the switching device (200) is used for switching the output of the laser system (100) to be laser light with the second wavelength or the first wavelength.
2. The dual output laser treatment apparatus of claim 1 wherein the first wavelength is selected from the range of 1.9 μm to 2.0 μm and the second wavelength is selected from the range of 1.7 μm to 1.8 μm.
3. The dual output laser treatment apparatus of claim 2 wherein the first wavelength is 1.94 μm and the second wavelength is 1.72 μm.
4. The dual output laser treatment instrument of claim 1, wherein the third wavelength is selected from the range of 1.5 μm to 1.6 μm and the laser generator (108) is an erbium doped fiber laser or a semiconductor laser.
5. The dual peak output lasermapeutic instrument of claim 1, wherein the switching device (200) is a shutter, which is arranged between the first wavelength high reflector (101) and the wavelength division multiplexer (109).
6. The dual output laser treatment apparatus of claim 5,
when the switching device (200) is opened, the first wavelength high-reflection mirror (101) participates in the optical path, so that the final output of the laser system (100) is laser light with a first wavelength;
when the switching device (200) is closed, the first wavelength high-reflection mirror (101) is shielded, so that the final output of the laser system (100) is laser light of a second wavelength.
7. The dual output laser treatment instrument of claim 6,
when switching device (200) are closed, the third wavelength laser that laser generator (108) produced enters into wavelength division multiplexer (109) through the high anti-grating of second wavelength (105), and then is reflected to thulium-doped fiber (110), is absorbed and is realized the population reversal by thulium-doped fiber (110), and the light wave after the stimulated emission is in reflection, oscillation in the second resonant cavity that the high anti-grating of second wavelength (105) and the partial reflection grating of second wavelength (112) constitute finally obtains second wavelength laser and exports transmission system (300).
8. The dual output laser treatment apparatus of claim 6,
when switching device (200) are opened, the third wavelength laser that laser generator (108) produced enters into wavelength division multiplexer (109) through the high anti-grating of second wavelength (105), and then is reflected to thulium-doped optical fiber (110), is absorbed and realizes the population reversal by thulium-doped optical fiber (110), and the light wave after the stimulated emission is in reflection, oscillation in the first resonant cavity that first wavelength high reflection mirror (101) and first wavelength partial reflection grating (113) constitute finally obtains first wavelength laser output to transmission system (300).
9. The dual peak output laser treatment instrument according to claim 1, further comprising a coupling lens (102) disposed between said first wavelength high reflector (101) and a wavelength division multiplexer (109) for implementing mode matching of said first resonant cavity.
10. The dual output laser treatment instrument of claim 1, wherein said delivery system (300) comprises an optical fiber (301) and a collimator (302).
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| US6411432B1 (en) * | 1999-03-19 | 2002-06-25 | Nec Corporation | Laser oscillator and laser amplifier |
| KR100759832B1 (en) * | 2006-04-10 | 2007-09-18 | 한국과학기술연구원 | Switchable multiwavelength erbium-doped fiber laser generator |
| US20190221986A1 (en) * | 2016-11-01 | 2019-07-18 | Shenzhen University | Dual-Wavelength Synchronous Pulsed Fiber Laser Based on Rare Earth Ions Co-doped Fiber |
| CN110635346A (en) * | 2019-07-04 | 2019-12-31 | 天津大学 | Ring cavity 1.7um thulium-doped all-fiber laser |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6411432B1 (en) * | 1999-03-19 | 2002-06-25 | Nec Corporation | Laser oscillator and laser amplifier |
| KR100759832B1 (en) * | 2006-04-10 | 2007-09-18 | 한국과학기술연구원 | Switchable multiwavelength erbium-doped fiber laser generator |
| US20190221986A1 (en) * | 2016-11-01 | 2019-07-18 | Shenzhen University | Dual-Wavelength Synchronous Pulsed Fiber Laser Based on Rare Earth Ions Co-doped Fiber |
| CN110635346A (en) * | 2019-07-04 | 2019-12-31 | 天津大学 | Ring cavity 1.7um thulium-doped all-fiber laser |
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