CN108988115B - Novel same-threshold equivalent dual-waveband intermediate infrared pulse laser and laser output method - Google Patents
Novel same-threshold equivalent dual-waveband intermediate infrared pulse laser and laser output method Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094096—Multi-wavelength pumping
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094042—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1123—Q-switching
- H01S3/113—Q-switching using intracavity saturable absorbers
Abstract
The invention discloses a novel equivalent dual-waveband mid-infrared pulse laser with the same threshold value and a laser output method, relating to the technical field of mid-near infrared laser, comprising a 1150nmLD pump source, a first dichroic mirror, a second dichroic mirror, a first focusing lens, a double-cladding holmium-doped fluoride gain fiber, a first collimating mirror and a gold-plated reflecting mirror which are sequentially arranged along the horizontal direction, and further comprising a 1950nmLD pump source arranged above the first dichroic mirror, wherein a second focusing lens, an stibene two-dimensional saturable absorption material and a second collimating mirror are sequentially arranged between the first collimating mirror and the gold-plated reflecting mirror along the horizontal direction, the invention can realize the output of dual-waveband continuous laser with the same threshold value of 3 microns and 2.1 microns, and can realize the synchronous equivalent rate output of dual-wavelength pulse laser with 3 microns and 2.1 microns by adjusting the power ratio of the 1150nmLD pump source and the 1950nmLD pump source, can be widely applied to the fields of multi-material processing, medical surgery and the like.
Description
Technical Field
The invention relates to the technical field of mid-near infrared laser, in particular to a novel equivalent dual-waveband mid-infrared pulse laser with the same threshold value and a laser output method.
Background
With the continuous development of fiber laser technology, mid-infrared pulse fiber lasers gradually attract the attention of numerous scholars at home and abroad, and potential applications of the mid-infrared pulse fiber lasers mainly include military defense, laser minimally invasive surgery, mid-infrared spectroscopy, long-wave mid-infrared pumping sources and the like. As commercial products of high-power semiconductor lasers are matured continuously at present, diode pumping sources erbium-doped and holmium-doped fluoride fiber lasers are outstanding for realizing medium infrared laser pulses with high energy and high peak power. Generally, two modes can be used to realize the pulse laser chain, namely a Q-switched mode and a mode-locked mode, wherein the mode-locked fiber laser can realize ultrashort laser pulse output with high peak power, and the passive mode-locked fiber laser can generate femtosecond pulse laser with high peak power reaching 37kW at a waveband of 3 microns; however, the Q-switched fiber laser can effectively realize the output of pulse laser with higher energy, in the past decades, a great amount of experiments generate Q-switched fiber laser with the diameter of 3 microns, which mainly adopts an active Q-switched mode (such as acousto-optic Q-switched, electro-optic Q-switched and mechanical Q-switched) and a passive Q-switched mode (such as a semiconductor saturable absorber mirror, a transmission type metal doped crystal, graphene, a topological insulator, black phosphorus and other novel two-dimensional materials).
The current rise of new two-dimensional materials has mainly focused on graphene, topological insulators, and transmissive metal disulfides, and they are expected to be a new electro-optical modulator due to their excellent physicochemical properties. The two-dimensional graphene material is found for the first time in 2004 and is used for realizing erbium-doped fiber pulse laser with a wave band of-1.55 microns in 2009; in 2013, Wachen et al, university of Arizona realizes the output of 3-micron erbium-doped fluoride Q-switched pulse laser based on graphene material for the first time, and the material is not very suitable for generating short-pulse Q-switched laser due to extremely low absorption efficiency caused by low modulatable depth. Thereafter, topological insulators and transmissive metal double sulfides and other materials are used to generate-3 micron erbium/holmium doped fluoride fiber pulsed lasers, although topological insulators can have large modulation depths in the broadband range, the more complex preparation process is difficult to combine on two different elements; in addition, the metal double sulfide of the broadband transmission type makes the energy level suitable for the mid-infrared band because some defects may be introduced inside the material thereof, but the manufacturing process thereof is relatively complicated.
In recent years, black phosphorus has attracted much attention because of its unique direct band gap layer, which is composed of group V elements and has a band gap tunable range of-0.3 eV to-2 eV, making it very suitable for near infrared and even mid-infrared photoelectric switches, but during the experiment, it is very easily oxidized in the ambient environment, causing its performance to be degraded and further increasing the thermal effect reaction with water and oxygen present in the air. Compared with the previous two-dimensional materials, antimonene, as a novel two-dimensional material, has excellent properties such as: the material has the characteristic of broadband saturable absorption, and the pulse energy of a wave band of 3 microns can be effectively absorbed in shallow soft tissues, so that the material is very suitable for medical ablation of non-thermal injury tissues, and meanwhile, the pulse laser of 2.1 microns can well play a blood coagulation role in laser surgery; in addition, the equivalent-3-micron pulse and 2.1-micron pulse with the same threshold value also play a very important role in multi-material processing, so that the realization of equivalent and stable dual-band (-3-micron and 2.1-micron) mid-infrared pulse laser output with the same threshold value by combining a novel stibene two-dimensional material is a new technical means, and the dual-band mid-infrared pulse laser plays a remarkable role in many practical applications.
As shown in fig. 3, a structure diagram of an erbium-doped ZBLAN fiber laser based on two-dimensional nanomaterial graphene Q-switching is provided, which realizes output of laser pulses in a-3-micron waveband by adopting a passive Q-switching mode, wherein a 976nm pump laser diode is used as a pump source, pump light is coupled into an erbium-doped ZBLAN gain fiber through a collimating lens, a dichroic mirror and a focusing lens, then the graphene fiber mirror is directly connected with the tail of the gain fiber, and finally-3-micron Q-switching laser pulses are guided out by a dichroic mirror close to the 976nm pump laser diode and detected after filtering output pulse laser. Graphene is deposited on the fiber mirror as an effective saturable absorption device to realize the formation of laser pulses in a cavity, a filter is used for filtering residual pump light in output laser, and the output of laser pulses of 3 microns in different states is realized by changing the length of a gain fiber and the power of a pump light source, but the laser has the following defects:
1. because the laser utilizes the two-dimensional nano material graphene as a saturable absorber to realize passive Q-switched pulse output, the modulatable depth of the graphene material is low, so that the absorption efficiency of the graphene material on pumping light is low, and stable short-pulse Q-switched laser cannot be effectively generated;
2. the graphene is deposited on the optical fiber mirror, so that the experimental operation difficulty is increased, meanwhile, the graphene optical fiber mirror is directly connected with the tail part of the gain optical fiber, the accuracy of the experimental operation is improved, the simple operation is not easy, the residual pump light energy is more concentrated and is applied to the material, the material is extremely easy to damage, and the laser conversion efficiency of 3 microns is greatly reduced;
3. the laser can only realize the generation of-3 micron single-wavelength laser pulse, cannot obtain-2.1 micron laser simultaneously, and has narrow applicability.
As shown in fig. 4, a structure diagram of an erbium-doped ZBLAN fiber pulse laser for Q-switching based on two-dimensional material black phosphorus is disclosed, which adopts a 976nm semiconductor laser as a laser pumping source to pump an erbium-doped ZBLAN gain fiber to realize-3 μ M passive Q-switching pulse laser output, wherein a pumping laser diode is coupled into the erbium-doped gain fiber through a dichroic mirror F2 after passing through a collimating focusing lens F1, light at the other end of the gain fiber is emitted to two total reflection mirrors M1 and M2 to adjust a light path, and is finally emitted to a gold mirror coated with two-dimensional material black phosphorus to realize modulation of pulse laser; the gold mirror coated with the two-dimensional material black phosphorus is prepared by a liquid phase stripping method, and is used as a reflection type saturable absorption mirror, the left end surface of the erbium-doped gain fiber and the gold mirror coated with the two-dimensional material black phosphorus are used as a resonant cavity of a laser, a dichroic mirror close to a 976nm pumping source is used for guiding 3-micron laser output, and the characteristics of waveforms of output pulses in different states, corresponding power of the pulses and the like are obtained by changing the power of the 976nm pumping source, but the laser has the following defects:
1. because the laser realizes the output of the passive Q-switched pulse by taking the two-dimensional material black phosphorus as a saturable absorber, the black phosphorus is prepared by a liquid phase stripping method and is deposited on the gold mirror, the surface of the black phosphorus is exposed in the air and is easy to be oxidized with oxygen, so that the performance of the black phosphorus is attenuated, and the black phosphorus is further increased to carry out thermal effect reaction with water and oxygen existing in the air, so that the modulation capability of the black phosphorus on a system is reduced, the absorption efficiency is lower, and the stable formation of the Q-switched pulse is not facilitated;
2. the two-dimensional material black phosphorus is deposited on the surface of the gold mirror, so that the gold mirror is easy to damage and is not beneficial to reuse, and the preparation cost is high, so that the experimental equipment is expensive;
3. the laser has single laser emitting wavelength, is not suitable for some applications requiring multi-wavelength laser output, and limits the application potential of the laser.
Most of the current experiments realize the wavelength of the infrared laser in the passive Q-switched pulse to be mainly 3 microns and 3.5 microns based on novel two-dimensional materials, the synchronous threshold output of the dual-wavelength continuous laser of 3 microns and 2.1 microns is lacked, and the commonly used two-dimensional materials mainly comprise graphene, topological insulators, black phosphorus and the like, but the Q-switched laser pulse which works stably for a long time and in a broadband can not be realized due to the defects of different physicochemical properties of the two-dimensional materials.
Disclosure of Invention
The invention aims to: the invention provides a novel equivalent dual-waveband mid-infrared pulse laser with the same threshold and a laser output method, aiming at solving the problems that the wavelength of the existing passive Q-switched pulse mid-infrared laser is mainly between 3 microns and 3.5 microns based on a novel two-dimensional material, and the synchronous threshold output of the dual-wavelength continuous laser with 3 microns and 2.1 microns is lacked.
The invention specifically adopts the following technical scheme for realizing the purpose:
novel with equivalent dual waveband mid infrared pulse laser of threshold value, include 1150nmLD pumping source, first dichroic mirror, second dichroic mirror, first focusing lens, double-clad holmium-doped fluoride gain optic fibre, first collimating mirror and gilt speculum, its characterized in that set up in order along the horizontal direction: also comprises a 1950nmLD pump source arranged above the first dichroic mirror, the first dichroic mirror and the second dichroic mirror are both obliquely arranged,
wherein, the 1150nmLD pumping source is used for generating continuous pumping laser A; 1950nmLD pump source for generating continuous pump laser B; the first dichroic mirror is highly transparent to the continuous pumping laser A and highly reflective to the continuous pumping laser B, and is used for combining the continuous pumping laser A and the continuous pumping laser B; the second dichroic mirror is highly transparent to the continuous pumping laser A and the continuous pumping laser B, highly reflective to the laser of 3 micrometers and 2.1 micrometers, and is used for guiding and outputting the generated laser of 3 micrometers and 2.1 micrometers; the first focusing lens is used for focusing the continuous pumping laser A and the continuous pumping laser B into the double-cladding holmium-doped fluoride gain fiber and collimating the generated laser with the wavelength of 3 microns and 2.1 microns; the double-clad holmium-doped fluoride gain fiber is used for generating laser of 3-micron and 2.1-micron; the first collimating mirror is used for collimating and injecting the laser light of 3 micrometers and 2.1 micrometers onto the gold-plated reflecting mirror; the gold-plated reflecting mirror is highly reflective to the 3-micron and 2.1-micron laser light and is used for providing feedback of the whole laser cavity; and the left end surface of the double-cladding holmium-doped fluoride gain fiber and the gold-plated reflector enclose a resonant cavity.
Further, a second focusing lens, an antimonene two-dimensional saturable absorption material and a second collimating lens are sequentially arranged between the first collimating mirror and the gold-plated reflecting mirror along the horizontal direction, wherein the second focusing lens is used for focusing lasers of-3 micrometers and-2.1 micrometers and exciting the lasers to the antimonene two-dimensional saturable absorption material; the stibene two-dimensional saturable absorption material passively adjusts Q for the laser with the diameter of 3 microns and 2.1 microns; the second collimating mirror collimates the 3 micron and 2.1 micron laser again and then injects the collimated laser onto the gold-plated reflecting mirror.
Further, the stibene two-dimensional saturable absorption material is prepared by a liquid phase stripping method and is deposited in CaF2The basic level is higher.
Furthermore, the included angle between the left end face of the double-clad holmium-doped fluoride gain fiber and the horizontal plane is 0 degree, and the included angle between the right end face of the double-clad holmium-doped fluoride gain fiber and the horizontal plane is 8 degrees, so that parasitic laser oscillation is prevented.
Further, the energy level in the double-clad holmium-doped fluoride gain fiber is changedThe process is as follows: continuously pumped laser A will5I8/2Pumping part of ground state particles at energy level to5I6/2At an energy level to realize a ground state absorption process A5I8/2→5I6/2Is a5I6/2Energy level accumulation of ground state particles to achieve5I6/2Energy level and5I7/2particle number inversion between energy levels, so that5I6/2Transition of particles at energy level to5I7/2The energy level generates-3 micron laser;
continuously pumped laser B will5I8/2Pumping part of ground state particles at energy level to5I7/2At an energy level to realize a ground state absorption process B5I8/2→5I7/2Is a5I7/2Energy level accumulation of ground state particles to achieve5I7/2Energy level and5I8/2particle number inversion between energy levels, such that5I7/2Transition of particles at energy level to5I8/2The energy level produces a 2.1 micron laser.
The novel laser output method of the equivalent dual-waveband mid-infrared pulse laser with the same threshold value comprises the following steps:
s1: starting 1150nmLD pump source and 1950nmLD pump source, wherein the 1150nmLD pump source generates continuous pump laser A, and the 1950nmLD pump source generates continuous pump laser B;
s2: after the continuous pumping laser A and the continuous pumping laser B are combined through the first dichroic mirror, the combined laser is coupled into the double-cladding holmium-doped fluoride gain fiber through the second dichroic mirror and the first focusing lens, and the continuous pumping laser A in the double-cladding holmium-doped fluoride gain fiber enables partial ground state particles to pass through5I6/2Energy level is radiated to5I7/2Energy level generating-3 micron laser, continuously pumping laser B to make partial ground state particles5I7/2Energy level is radiated to5I8/2The energy level generates 2.1 micron laser;
s3: the power of the 1150nmLD pump source and the 1950nmLD pump source is respectively adjusted to realize the generation of dual-wavelength continuous laser with the same threshold value of 3 microns and 2.1 microns;
s4: the generated continuous laser with double wavelengths of 3 microns and 2.1 microns is collimated by the first collimating mirror, then is emitted onto the gold-plated reflecting mirror, is output from the left end face of the double-cladding holmium-doped fluoride gain optical fiber after being reflected by the gold-plated reflecting mirror, and is guided to be output through the collimation of the first focusing lens and the reflection of the second dichroic mirror.
Further, a second focusing lens, an antimonene two-dimensional saturable absorption material and a second collimating lens are arranged between the first collimating lens and the gold-plated reflecting mirror, the antimonene two-dimensional saturable absorption material is adjusted at the focal length of the second focusing lens, the power of the 1150nmLD pump source and the power of the 1950nmLD pump source are respectively adjusted, when the S3 generates the dual-wavelength continuous laser with the same threshold value of 3 microns and 2.1 microns, a relaxation oscillation process is formed, then after the continuous laser with double wavelengths of 3 microns and 2.1 microns generated by the S4 is collimated by the first collimating mirror, the continuous laser with double wavelengths of 3 microns and 2.1 microns is focused and emitted into the stibene two-dimensional saturable absorption material through a second focusing lens, the continuous laser with double wavelengths of 3 microns and 2.1 microns is modulated by an antimonene two-dimensional saturable absorption material, and then the modulated laser is injected onto a gold-plated reflecting mirror through a second collimating mirror, so that the output of pulse laser with double wavelengths of 3 microns and 2.1 microns with narrow pulse width and high peak power is realized.
Further, the power of the pulse laser with the wavelength of 3 microns and 2.1 microns is measured respectively from the back of the second dichroic mirror, the oblique efficiency is calculated respectively, the power ratio of the 1150nmLD pump source and the 1950nmLD pump source is adjusted, and synchronous equivalent rate output of the pulse laser with the wavelength of 3 microns and 2.1 microns is achieved.
The invention has the following beneficial effects:
1. according to the method, the output of the double-cladding holmium-doped fluoride gain optical fiber with the same threshold value and double wave bands of 3 microns and 2.1 microns can be realized by using the continuous laser pumping sources with the wave bands of 1150nm and 1950nm to perform mixed pumping on the double-cladding holmium-doped fluoride gain optical fiber, the phenomenon of laser transition self-termination caused by the transition saturation phenomenon of 3 microns is effectively avoided, the high-efficiency output of the laser with the wavelength of 3 microns can be realized, and the problem of high heat production of the gain optical fiber during single-wavelength output can be reduced.
2、The invention prepares novel two-dimensional material stibene by adopting a liquid phase stripping method and deposits the stibene in CaF2The transmission type saturable absorption device is manufactured on the surface of the substrate, the manufacturing cost is low, the operation is simple, the experimental operation difficulty is greatly reduced, the system is simplified, and due to the unique advantages of high stability, high carrier carrying capacity, excellent heat conductivity, strain-induced band gap conversion, broadband absorption and the like of the stibene, synchronous-3 micron and-2.1 micron pulse lasers can be simultaneously output.
3. According to the invention, by regulating and controlling the power ratio of 1150nm and 1950nm pump sources, the passive Q-switched pulse laser output with equal-efficiency output powers close to 3 microns and 2.1 microns is easy to realize, and meanwhile, based on the stability of a novel two-dimensional antimonene material, the pulse laser output by the whole system can stably work for a long time.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a simplified energy level diagram of a double clad holmium-doped fluoride gain fiber.
Fig. 3 is a structural diagram of an erbium-doped ZBLAN fiber laser based on two-dimensional nanomaterial graphene Q-switching.
Fig. 4 is a structural diagram of an erbium-doped ZBLAN fiber pulse laser based on two-dimensional material black phosphorus Q-switching.
Reference numerals: 1. 1150nmLD pump source; 2. 1950nmLD pump source; 3. a first dichroic mirror; 4. a second dichroic mirror; 5. a first focusing lens; 6. double-clad holmium-doped fluoride gain fiber; 7. a first collimating mirror; 8. a second focusing lens; 9. an antimonene two-dimensional saturable absorber material; 10. a second collimating mirror; 11. a gold-plated mirror; 12.5I8/2an energy level; 13.5I7/2an energy level; 14.5I6/2an energy level; 15. a ground state absorption process A; 16. a ground state absorption process B; 17. -3 micron laser; 18. 2.1 micron laser.
Detailed Description
For a better understanding of the present invention by those skilled in the art, the present invention will be described in further detail below with reference to the accompanying drawings and the following examples.
Example 1
As shown in fig. 1, this embodiment provides a novel equivalent dual-band mid-infrared pulse laser with the same threshold, which includes a 1150nmLD pump source 1, a first dichroic mirror 3, a second dichroic mirror 4, a first focusing lens 5, a double-clad holmium-doped fluoride gain fiber 6, a first collimating mirror 7, a gold-plated reflecting mirror 8, and a 1950nmLD pump source 2 disposed above the first dichroic mirror 3, wherein the first dichroic mirror 3 and the second dichroic mirror 4 are both disposed in an inclined manner, the specific inclination angle is determined according to the actual situation, the left end surface of the double-clad holmium-doped fluoride gain fiber has an angle of 0 ° with the horizontal plane, the right end surface has an angle of 8 ° with the horizontal plane,
wherein, the 1150nmLD pumping source 1 is used for generating continuous pumping laser A; 1950nmLD pump source 2 for generating continuous pump laser B; the first dichroic mirror 3 is highly transparent to the continuous pumping laser A and highly reflective to the continuous pumping laser B, and is used for combining the continuous pumping laser A and the continuous pumping laser B; the second dichroic mirror 4 is highly transparent to the continuous pumping laser A and the continuous pumping laser B, highly reflective to the-3 micron and-2.1 micron lasers, and is used for guiding and outputting the generated-3 micron and-2.1 micron lasers; the first focusing lens 5 is used for focusing the continuous pumping laser A and the continuous pumping laser B into the double-clad holmium-doped fluoride gain fiber 6 and collimating the generated laser with the wavelength of 3 microns and 2.1 microns; the double-clad holmium-doped fluoride gain fiber 6 is used for generating laser of 3-micron and 2.1-micron; the first collimating mirror 7 is used for collimating and injecting laser light of 3 micrometers and 2.1 micrometers onto the gold-plated reflecting mirror 11; the gold-plated reflecting mirror 11 is highly reflective to the 3-micron and 2.1-micron laser light and is used for providing feedback of a laser cavity; the left end surface of the double-clad holmium-doped fluoride gain fiber 6 and the gold-plated reflector enclose a resonant cavity.
The novel laser output method of the equivalent dual-waveband mid-infrared pulse laser with the same threshold value comprises the following steps:
s1: starting 1150nmLD pump source 1 and 1950nmLD pump source 2, wherein the 1150nmLD pump source 1 generates continuous pump laser A, and the 1950nmLD pump source 2 generates continuous pump laser B;
s2: after the continuous pumping laser A and the continuous pumping laser B are combined through the first dichroic mirror 3, the combined laser is coupled into the double-cladding holmium-doped fluoride gain optical fiber 6 through the second dichroic mirror 4 and the first focusing lens 5, and the continuous pumping laser A in the double-cladding holmium-doped fluoride gain optical fiber 6 enables the continuous pumping laser A to be pumped5I6/2Particles at energy level 14 are irradiated to5I7/2Energy level 13 generates-3 micron laser 17, continuously pumping laser B5I7/2Particles at energy level 13 are irradiated to5I8/2Energy level 12 generates-2.1 micron laser 18;
the energy level change process in the double-clad holmium-doped fluoride gain fiber 6 is as follows: continuously pumped laser A will5I8/2Part of the ground state particles at energy level 12 is pumped to5I6/2At energy level 14, a ground state absorption process A15 is achieved5I8/2→5I6/2Is a5I6/2Energy level 14 accumulates ground state particles to achieve5I6/2Energy level 14 and5I7/2population inversion between levels 13, to get5I6/2Transition of particles at energy level 14 to5I7/2Energy level 13 generates-3 micron laser 17;
continuously pumped laser B will5I8/2Part of the ground state particles at energy level 12 is pumped to5I7/2At energy level 13, the ground state absorption process B16 is realized5I8/2→5I7/2Is a5I7/2Energy level 13 accumulates ground state particles to achieve5I7/2Energy level 13 and5I8/2population inversion between levels 12, such that5I7/2Transition of particles at energy level 13 to5I8/2Energy level 12 generates-2.1 micron laser 18;
s3: the power of the 1150nmLD pump source 1 and the 1950nmLD pump source 2 is respectively adjusted to realize the generation of dual-wavelength continuous laser with the same threshold value of 3 microns and 2.1 microns, which specifically comprises the following steps:
the powers of the 1150nmLD pump source 1 and 1950nmLD pump source 2 are appropriately adjusted so that the power ratios therebetween respectively satisfy:
the 1150nmLD pump source 1 has a power ratio of: 35 percent of<P1150/(P1150+P1950)<50％；
S4: the generated continuous laser with double wavelengths of 3 microns and 2.1 microns is collimated by the first collimating mirror 7, then is emitted onto the gold-plated reflecting mirror 11, is reflected by the gold-plated reflecting mirror 11, is output from the left end face of the double-clad holmium-doped fluoride gain optical fiber 6, and is output by the collimation of the first focusing lens 5 and the reflection of the second dichroic mirror 4.
Example 2
The embodiment is further optimized based on embodiment 1, and specifically includes:
a second focusing lens 8, an antimonene two-dimensional saturable absorption material 9 and a second collimating lens 10 are sequentially arranged between the first collimating mirror 7 and the gold-plated reflecting mirror 11 along the horizontal direction, wherein the second focusing lens 8 is used for focusing lasers of 3 micrometers and 2.1 micrometers and exciting the lasers to the antimonene two-dimensional saturable absorption material 9; the stibene two-dimensional saturable absorption material 9 passively adjusts Q for the laser of 3-micron and 2.1-micron; the second collimating mirror 10 collimates the laser of 3 microns and 2.1 microns again and then injects the collimated laser onto the gold-plated reflecting mirror 11, and the stibene two-dimensional saturable absorption material is prepared by a liquid phase stripping method and is deposited on CaF2The basic level is higher.
Placing a second focusing lens 8, an antimonene two-dimensional saturable absorption material 9 and a second collimating lens 10 between a first collimating lens 7 and a gold-plated reflecting mirror 11, adjusting the focus of the antimonene two-dimensional saturable absorption material 9 at the second focusing lens 8, respectively adjusting the power of 1150nmLD pump source 1 and 1950nmLD pump source 2 to ensure that the power ratio of the antimonene two-dimensional saturable absorption material 9 and the antimonene two-dimensional saturable absorption material meets the conditions in the embodiment, forming a relaxation oscillation process when S3 generates dual-wavelength continuous laser with the same threshold value of 3 microns and 2.1 microns, then after the dual-wavelength continuous laser generated by S4 is collimated by the first collimating lens 7, focusing the dual-wavelength continuous laser of 3 microns and 2.1 microns into the antimonene two-dimensional saturable absorption material 9 through the second focusing lens 8, modulating the dual-wavelength continuous laser of 3 microns and 2.1 microns through the antimonene two-dimensional saturable absorption material 9, the modulated laser beam is emitted to a gold-plated reflecting mirror 11 through a second collimating mirror 10, the modulated laser beam is modulated by an antimonene two-dimensional saturable absorption material 9 due to the difference of signal intensity in the relaxation process, when the laser power is high, the part of laser beam can effectively penetrate through the antimonene two-dimensional saturable absorption material 9, and when the laser power is low, the part of laser beam can be absorbed by the antimonene two-dimensional saturable absorption material 9, so that the process is continuously circulated in the laser oscillation process, the part with high pulse laser intensity is continuously strengthened, the part with low pulse laser intensity is continuously absorbed, and finally the output of the pulse laser beam with the high peak power of the narrowed pulse width and the double wavelength of the pulse laser beam with the power of-3 microns and the wavelength of-2.1 microns is realized.
Example 3
The embodiment is further optimized based on the embodiment 2, and specifically includes:
the power of the pulse laser with the wavelength of 3 microns and 2.1 microns is measured from the second dichroic mirror 4, the oblique efficiency is calculated respectively, the power ratio of the 1150nmLD pump source and the 1950nmLD pump source is adjusted to meet the conditions in the embodiment 1, the difference between the two oblique efficiencies obtained through calculation is enabled to float to be lower than 2%, and the synchronous equivalent rate output of the pulse laser with the wavelength of 3 microns and 2.1 microns is realized.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, the scope of the present invention is defined by the appended claims, and all structural changes that can be made by using the contents of the description and the drawings of the present invention are intended to be embraced therein.
Claims (4)
1. The utility model provides an with threshold value equivalent dual band mid infrared pulse laser, includes 1150nmLD pumping source (1), first dichroic mirror (3), second dichroic mirror (4), first focusing lens (5), double-clad holmium-doped fluoride gain optic fibre (6), first collimating mirror (7) and gilt speculum (11) that set up in order along the horizontal direction, its characterized in that: the lighting device also comprises a 1950nmLD pump source (2) arranged above the first dichroic mirror (3), wherein the first dichroic mirror (3) and the second dichroic mirror (4) are obliquely arranged,
wherein the 1150nmLD pump source (1) is used for generating continuous pump laser A; 1950nmLD pump source (2) for generating continuous pump laser B; the first dichroic mirror (3) is highly transparent to the continuous pumping laser A and highly reflective to the continuous pumping laser B, and is used for combining the continuous pumping laser A and the continuous pumping laser B; the second dichroic mirror (4) is highly transparent to the continuous pumping laser A and the continuous pumping laser B, highly reflective to the-3 micron and-2.1 micron lasers, and is used for guiding and outputting the generated-3 micron and-2.1 micron lasers; the first focusing lens (5) is used for focusing the continuous pumping laser A and the continuous pumping laser B into the double-clad holmium-doped fluoride gain fiber (6) and collimating the generated laser with the wavelength of-3 micrometers and-2.1 micrometers; a double-clad holmium-doped fluoride gain fiber (6) is used for generating laser of 3-micron and 2.1-micron; the first collimating mirror (7) is used for collimating the laser light of 3 micrometers and 2.1 micrometers and is incident on the gold-plated reflecting mirror (11); the gold-plated reflecting mirror (11) is highly reflective to the laser light of 3 microns and 2.1 microns and is used for providing feedback of the whole laser cavity; the left end surface of the double-clad holmium-doped fluoride gain fiber (6) and the gold-plated reflector enclose a resonant cavity;
a second focusing lens (8), an antimonene two-dimensional saturable absorption material (9) and a second collimating lens (10) are sequentially arranged between the first collimating mirror (7) and the gold-plated reflecting mirror (11) along the horizontal direction, and the second focusing lens (8) is used for focusing lasers of-3 micrometers and-2.1 micrometers and exciting the lasers to the antimonene two-dimensional saturable absorption material (9); the stibene two-dimensional saturable absorption material (9) passively adjusts Q of the laser of 3 microns and 2.1 microns; the second collimating mirror (10) collimates the laser of 3 microns and 2.1 microns again and then irradiates the laser to the gold-plated reflecting mirror (11);
the stibene two-dimensional saturable absorption material (9) is prepared by a liquid phase stripping method and is deposited on CaF2A substrate;
and measuring the power of the pulse laser with the wavelength of 3 microns and 2.1 microns from the second dichroic mirror (4), calculating the skew efficiency, adjusting the power ratio of the 1150nmLD pump source (1) to the 1950nmLD pump source (2), and realizing the synchronous equivalent rate output of the pulse laser with the wavelength of 3 microns and 2.1 microns.
2. The same-threshold equivalent dual-band mid-ir pulsed laser according to claim 1, characterized in that: the left end face of the double-clad holmium-doped fluoride gain fiber (6) forms an angle of 0 degree with the horizontal plane, and the right end face of the double-clad holmium-doped fluoride gain fiber forms an oblique angle of 8 degrees with the horizontal plane.
3. The same-threshold equivalent dual-band mid-ir pulsed laser according to claim 1, characterized in that: the energy level change process in the double-clad holmium-doped fluoride gain fiber (6) is as follows: continuously pumped laser A will5I8/2Pumping part of the ground state particles at energy level (12) to5I6/2At energy level (14), effecting a ground state absorption process A (15)5I8/2→5I6/2Is a5I6/2Energy level (14) accumulates ground state particles to achieve5I6/2Energy level (14) and5I7/2the population between the energy levels (13) is reversed so that5I6/2Transition of particles on energy level (14) to5I7/2The energy level (13) generates a-3 micron laser (17);
continuously pumped laser B will5I8/2Pumping part of the ground state particles at energy level (12) to5I7/2At energy level (13), effecting a ground state absorption process B (16)5I8/2→5I7/2Is a5I7/2Energy level (13) accumulates ground state particles to achieve5I7/2Energy level (13) and5I8/2the population between the energy levels (12) is reversed to5I7/2Transition of particles on energy level (13) to5I8/2The energy level (12) produces a 2.1 micron laser (18).
4. A laser output method of a same-threshold equivalent dual-waveband intermediate infrared pulse laser is characterized by comprising the following steps:
s1: starting 1150nmLD pump source (1) and 1950nmLD pump source (2), wherein the 1150nmLD pump source (1) generates continuous pump laser A, and the 1950nmLD pump source (2) generates continuous pump laser B;
s2: after the continuous pumping laser A and the continuous pumping laser B are combined through the first dichroic mirror (3), the continuous pumping laser A and the continuous pumping laser B are coupled into the double-cladding holmium-doped fluoride gain optical fiber (6) through the second dichroic mirror (4) and the first focusing lens (5), and the continuous pumping laser A in the double-cladding holmium-doped fluoride gain optical fiber (6) enables the continuous pumping laser A to be pumped5I6/2Particles at an energy level (14) are irradiated to5I7/2The energy level (13) generates a-3 micron laser (17) that is continuously pumped by laser B5I7/2Particles at an energy level (13) are irradiated to5I8/2An energy level (12) generates a 2.1 micron laser (18);
s3: the power of the 1150nmLD pump source (1) and the power of the 1950nmLD pump source (2) are respectively adjusted, and the generation of dual-wavelength continuous laser with the same threshold value of 3 microns and 2.1 microns is realized;
s4: the generated continuous laser with double wavelengths of 3 microns and 2.1 microns is collimated by a first collimating mirror (7), then is emitted onto a gold-plated reflecting mirror (11), is reflected by the gold-plated reflecting mirror (11), is output from the left end face of a double-clad holmium-doped fluoride gain optical fiber (6), and is collimated by a first focusing lens (5) and reflected by a second dichroic mirror (4) to be guided to be output;
placing a second focusing lens (8), an antimonene two-dimensional saturable absorption material (9) and a second collimating lens (10) between a first collimating lens (7) and a gold-plated reflecting mirror (11), adjusting the antimonene two-dimensional saturable absorption material (9) at the focal length of the second focusing lens (8), respectively adjusting the power of a 1150nmLD pump source (1) and a 1950nmLD pump source (2), then after collimating the-3 micron and-2.1 micron dual-wavelength continuous laser generated by S4 through the first collimating lens (7), focusing the-3 micron and-2.1 micron dual-wavelength continuous laser through the second focusing lens (8) and injecting into the antimonene two-dimensional saturable absorption material (9), modulating the-3 micron and-2.1 micron dual-wavelength continuous laser through the antimonene two-dimensional saturable absorption material (9), injecting the modulated dual-wavelength continuous laser into the reflecting mirror (11) through the second collimating lens (10), the output of pulse laser with double wavelengths of 3 microns and 2.1 microns with narrow pulse width and high peak power is realized;
and measuring the power of the pulse laser with the wavelength of 3 microns and 2.1 microns from the second dichroic mirror (4), calculating the skew efficiency, adjusting the power ratio of the 1150nmLD pump source (1) to the 1950nmLD pump source (2), and realizing the synchronous equivalent rate output of the pulse laser with the wavelength of 3 microns and 2.1 microns.
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