CN114447754B - Femtosecond visible vortex light laser based on optical fiber internal transverse mode modulation - Google Patents
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 136
- 230000010287 polarization Effects 0.000 claims abstract description 47
- 238000005086 pumping Methods 0.000 claims abstract description 34
- 239000000835 fiber Substances 0.000 claims abstract description 32
- 238000006243 chemical reaction Methods 0.000 claims abstract description 18
- 230000000694 effects Effects 0.000 claims abstract description 16
- 239000006185 dispersion Substances 0.000 claims abstract description 14
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims abstract description 4
- 238000001228 spectrum Methods 0.000 claims description 16
- 230000005540 biological transmission Effects 0.000 claims description 7
- 230000008878 coupling Effects 0.000 claims description 7
- 238000010168 coupling process Methods 0.000 claims description 7
- 238000005859 coupling reaction Methods 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 230000005466 cherenkov radiation Effects 0.000 description 13
- 230000003287 optical effect Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 230000033228 biological regulation Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 230000004927 fusion Effects 0.000 description 3
- 239000004038 photonic crystal Substances 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000000799 fluorescence microscopy Methods 0.000 description 1
- 238000001459 lithography Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012576 optical tweezer Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
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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
- H01S3/08018—Mode suppression
- H01S3/0804—Transverse or lateral modes
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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
- H01S3/10061—Polarization control
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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
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
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Abstract
The invention discloses a femtosecond visible vortex light laser based on optical fiber internal transverse mode modulation, which comprises the following components: the ultra-short pulse laser pumping source is used for generating a pumping light signal; the high nonlinear optical fiber is connected with the ultra-short pulse laser pumping source and is used for transmitting a pumping light signal, enabling the pumping light signal to generate nonlinear frequency conversion effect, converting the light signal generation wave band into a visible light wave band and calculating to obtain a corresponding dispersion wave wavelength; the optical fiber mode selection coupler is connected with the high nonlinear optical fiber and is used for adjusting the optical fiber signal mode to realize mode conversion; and the polarization controller is connected with the optical fiber mode selection coupler and is used for outputting visible vortex light. The invention can realize stable visible vortex light output with an all-fiber structure, a femtosecond pulse width and adjustable wave band.
Description
Technical Field
The invention belongs to the field of fiber lasers, and particularly relates to a femtosecond visible vortex laser based on fiber internal transverse mode modulation.
Background
The vortex beam is used as a special novel beam, has a spiral wave front structure, annular intensity distribution and definite Orbital Angular Momentum (OAM) characteristics, and has huge application potential in optical tweezers systems, lithography technologies and particle manipulation due to the orbital angular momentum characteristics carried by the vortex beam. Meanwhile, the dark hollow annular intensity distribution can be used in stimulated emission depletion fluorescence microscopy, and the diffraction limit is broken through. In particular, the ultra-short pulse vortex beam in the visible light band has a larger application space in the biomedical field.
However, since it is difficult to generate a short pulse laser in the visible light band by the conventional mode locking technique, the visible light laser is generally a solid state laser, and the pulse width is mostly in the order of picoseconds and microseconds. In order to solve the above disadvantages, researchers obtain short-pulse visible light beams through the cerenkov radiation effect, and the short-pulse visible light beams have the advantages of adjustable wavelength, narrow pulse width and high output power and are relatively easy to realize. Most of the researches on the cerenkov radiation laser are focused on the theoretical simulation and experimental wavelength conversion aspects of the cerenkov radiation laser, and few researches on the high-order mode output of the cerenkov radiation laser are performed. The method for realizing vortex beam output of visible light short pulse through all optical fibers at the present stage is to utilize special optical fiber dislocation excitation to generate a high-order mode of visible light. However, this method has high loss due to the dislocation fusion, and has a fixed wavelength and a pulse width of nanosecond order. The other methods for achieving short pulses of visible light rely on spatial coupling or extraction of visible light components in supercontinuum, respectively. Both of these methods are relatively complex to operate and pulse widths are also difficult to reach on the order of femtoseconds. Meanwhile, the vortex light beam obtained by the output end is mostly obtained by manually adjusting a polarization controller, so that the output vortex light beam has randomness and instability.
In summary, finding a stable vortex beam with a pulse width in the visible light band reaching the femtosecond level is a concern for researchers.
Disclosure of Invention
The invention aims to provide a femtosecond visible vortex light laser based on optical fiber internal transverse mode modulation, and aims to realize stable visible vortex light output with an all-optical fiber structure, an femtosecond pulse width and adjustable wave band.
In order to achieve the above object, the present invention provides the following solutions: a femtosecond visible vortex light laser based on intra-fiber transverse mode modulation, comprising:
the ultra-short pulse laser pumping source is used for generating a pumping light signal;
the high nonlinear optical fiber is connected with the ultrashort pulse laser pumping source and is used for transmitting the pumping light signals, enabling the pumping light signals to generate nonlinear frequency conversion effect, converting the light signal generation wave band into a visible light wave band and calculating to obtain corresponding dispersion wave wavelengths;
the optical fiber mode selection coupler is connected with the high nonlinear optical fiber and is used for adjusting the optical fiber signal mode to realize mode conversion;
and the polarization controller is connected with the optical fiber mode selection coupler and is used for outputting visible vortex light.
Preferably, the highly nonlinear optical fiber comprises an input end and an output end;
the optical fiber mode selection coupler is formed by coupling a single-mode optical fiber and a few-mode optical fiber according to a set fiber core mode, and comprises a single-mode input end and a few-mode output end;
the input end of the high-nonlinearity optical fiber is connected with the ultrashort pulse laser pumping source, and the output end of the high-nonlinearity optical fiber is connected with the single-mode input end of the optical fiber mode selection coupler.
Preferably, the few-mode output end is connected with the polarization controller;
the few-mode output end is also connected with a light splitting coupler, and the light splitting coupler comprises a first port and a second port;
the first port is connected with a camera, and the second port is connected with a spectrum analyzer; the camera and the spectrum analyzer are used for observing light spots and spectrums.
Preferably, the polarization-maintaining optical fiber is welded to the optical fiber mode selection coupler and is used for regulating and controlling the optical fiber signal mode without the polarization controller.
Preferably, the polarization maintaining fiber is a fast and slow axis structure supporting high-order mode transmission of visible light.
Preferably, the polarizer also comprises a quarter wave plate; the quarter wave plate and the polarizer are connected with the optical fiber mode selection coupler and are used for regulating and controlling an optical fiber signal mode under the condition that the polarization controller is not arranged.
Preferably, the wavelength of the dispersion wave is adjustable by changing the type of the high nonlinear optical fiber and the power and pulse width of the ultra-short pulse laser pumping source.
The invention discloses the following technical effects:
the invention provides a femtosecond visible device based on optical fiber internal transverse mode modulationThe vortex optical laser pumps the high nonlinear optical fiber by taking the femtosecond laser pumping source as an excitation light source, and the generation of the cerenkov radiation effect can directly obtain the femtosecond visible light pulse. The phase matching curve of the Cerenkov radiation effect is simulated by simulation calculation, so that different scattered wave wavelengths corresponding to different nonlinear optical fibers can be obtained. The visible light mode selection coupler of the corresponding wave band is prepared according to different dispersion wave wavelengths, light transmitted in the high nonlinear optical fiber can be transmitted into the optical fiber mode selection coupler with smaller loss through fine fusion, the mode conversion of the all-fiber structure enables the mode conversion purity and efficiency to be higher, and LP can be obtained only through adjustment of a polarization controller at an output end 11 Mode or vortex light beam, easy operation and compatibility are strong. And different optical fibers are replaced, so that the femtosecond vortex pulse output of the whole visible light wave band can be realized. Meanwhile, the polarization-maintaining optical fiber and the wave plate are adjusted, so that the output high-order mode can be controlled and stably transmitted in the optical fiber under the condition that the polarization controller is not manually adjusted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a system architecture according to an embodiment of the present invention;
FIG. 2 is a graph of a spectrum received by a spectrum analyzer according to an embodiment of the present invention;
FIG. 3 is a schematic view of a light spot monitored by a camera at the output end of a fiber mode selection coupler when LMA-5 and LMA-8 large mode field photonic crystal fibers are used in an embodiment of the present invention;
FIG. 4 is a schematic diagram of two ways of regular regulation and control of output modes according to an embodiment of the present invention;
FIG. 5 is a graph showing the evolution of the output mode and the interference fringe of the polarization maintaining fiber according to the embodiment of the present invention;
FIG. 6 is a graph of the evolution of the output mode and the interference fringe pattern modulated by the quarter-wave plate and the polarizer in an embodiment of the present invention.
The system comprises an ultrashort pulse laser pumping source 1, a high nonlinear optical fiber 2, an optical fiber mode selection coupler 3, a polarization controller 4, a beam splitting coupler 5, a camera 6 and a spectrum analyzer 7; polarization maintaining optical fiber 8, quarter wave plate 9 and polarizer 10;11 is an output port of the light source, 31 is a single-mode input end of the optical fiber mode selection coupler, 32 is a few-mode output end of the optical fiber mode selection coupler, 51 is a first port of the optical splitting coupler, and 52 is a second port of the optical splitting coupler.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 1, the present invention provides a femtosecond visible vortex light laser based on transverse mode modulation in an optical fiber, comprising:
the ultra-short pulse laser pumping source is used for generating a pumping light signal;
the high nonlinear optical fiber is connected with the ultrashort pulse laser pumping source and is used for transmitting the pumping light signals, enabling the pumping light signals to generate nonlinear frequency conversion effect, converting the light signal generation wave band into a visible light wave band and calculating to obtain corresponding dispersion wave wavelengths;
the optical fiber mode selection coupler is connected with the high nonlinear optical fiber and is used for adjusting the optical fiber signal mode to realize mode conversion;
and the polarization controller is connected with the optical fiber mode selection coupler and is used for outputting visible vortex light.
The high nonlinear optical fiber comprises an input end and an output end;
the optical fiber mode selection coupler is formed by coupling a single-mode optical fiber and a few-mode optical fiber according to a set fiber core mode, and comprises a single-mode input end and a few-mode output end;
the input end of the high-nonlinearity optical fiber is connected with the ultrashort pulse laser pumping source, and the output end of the high-nonlinearity optical fiber is connected with the single-mode input end of the optical fiber mode selection coupler.
The few-mode output end is connected with the polarization controller;
the few-mode output end is also connected with a light splitting coupler, and the light splitting coupler comprises a first port and a second port;
the first port is connected with a camera, and the second port is connected with a spectrum analyzer; the camera and the spectrum analyzer are used for observing light spots and spectrums.
The polarization-maintaining optical fiber is welded to the optical fiber mode selection coupler and is used for adjusting and controlling an optical fiber signal mode under the condition that the polarization controller is not arranged.
The polarization maintaining optical fiber is of a fast and slow axis structure supporting visible light high-order mode transmission.
The device also comprises a quarter wave plate and a polarizer; the quarter wave plate and the polarizer are connected with the optical fiber mode selection coupler and are used for regulating and controlling an optical fiber signal mode under the condition that the polarization controller is not arranged.
The wavelength of the dispersion wave is adjustable by changing the type of the high nonlinear optical fiber, the power and the pulse width of the ultra-short pulse laser pumping source.
Example 1
Further, the femtosecond visible vortex light laser based on the transverse mode modulation in the optical fiber provided by the invention comprises the following components: the device comprises an ultrashort pulse laser pumping source, a high nonlinear optical fiber, an optical fiber mode selection coupler, a polarization controller, a polarization maintaining optical fiber, a quarter wave plate and a polarizer. The high nonlinear optical fiber input end is connected with the pumping source, and the output end is connected with the single-mode end of the optical fiber mode selection coupler. The optical fiber mode selection coupler is formed by coupling a single-mode optical fiber and a few-mode optical fiber according to a set fiber core mode. The few-mode output port of the optical fiber mode selection coupler outputs visible vortex light by adjusting the polarization controller. The polarization maintaining fiber can be welded at the few-mode output end of the fiber mode selection coupler to regulate and control the mode under the condition that the polarization controller is not arranged. The quarter wave plate and the polarizer can be connected to the few-mode output end of the optical fiber mode selection coupler to regulate and control the mode under the condition that the polarization controller is not provided.
The output end of the ultra-short pulse laser pumping source is connected with the input end of the high-nonlinearity optical fiber, after the pumping light signal passes through the high-nonlinearity optical fiber, a nonlinear frequency conversion effect, namely a Cerenkov radiation effect, is generated, the light signal is subjected to wave band conversion to a visible light wave band, and the output pulse width can reach the femtosecond level. Is connected to a single-mode input port of the fiber mode selection coupler by a highly nonlinear fiber. The optical signal is composed of LP 01 Mode conversion to LP 11 And the mode is output from a few-mode output port of the optical fiber mode selection coupler, and finally visible vortex rotation can be detected at the output end through adjusting the polarization controller. Further, in order to generate vortex light without manually adjusting the polarization controller, this includes outputting stable visible vortex light by fusing a polarization maintaining fiber at a specific angle and adjusting the angle of a quarter wave plate and a polarizer.
Further, the pulse width of the ultra-short pulse laser is in the femtosecond level, and the wave band and the energy meet the condition of generating the Cerenkov radiation.
Further, the wavelength is adjustable by changing the radiation dispersion wave center wavelength through changing the power and pulse width of the high nonlinear optical fiber type and the pump light source.
Further, the highly nonlinear optical fiber supports stable transmission in the visible light band, i.e., fundamental mode (LP 01 And (5) a mould).
Furthermore, the high nonlinear optical fiber should meet the condition of generating the cerenkov radiation effect, and calculate the corresponding wavelength of the dispersion wave.
Further, the operating band of the fiber mode selection coupler is consistent with the band of the dispersion of the radiation of the cerenkov effect generated by the high-nonlinearity fiber.
Further, when the high nonlinear optical fiber is welded with the optical fiber mode selection coupler, the optical fiber structure is not damaged, and the visible light fundamental mode can be stably transmitted to the single-mode end of the optical fiber mode selection coupler. When the high-nonlinearity optical fiber is welded with the single-mode optical fiber, the loss is small, and the transmission mode is not changed.
Further, the fiber mode selection coupler enables the slave LP 01 Mode to LP 11 The output of the vortex rotation can also be achieved by adjusting the polarization controller at the output.
Further, the coupling ratio of the single-mode fiber and the few-mode fiber of the fiber mode selection coupler can be different according to requirements.
Further, the working wave band of the optical splitting coupler is located in a visible light wave band, and different coupling ratios can be selected according to requirements.
Further, the polarization maintaining optical fiber is of a fast and slow axis structure and can support transmission of visible light high-order modes.
Further, the quarter wave plate and polarizer may act in the visible light band.
Example two
Further, as shown in fig. 1 to 6, the femtosecond visible vortex light laser based on the internal transverse mode modulation of the optical fiber provided by the invention comprises: the ultra-short pulse laser pump comprises an ultra-short pulse laser pump source 1, a high nonlinear optical fiber 2, an optical fiber mode selection coupler 3, a polarization controller 4, a beam splitting coupler 5, a camera 6, a spectrum analyzer 7, a polarization maintaining optical fiber 8, a quarter wave plate 9 and a polarizer 10; wherein 11 is the output port of the light source, 31 is the single-mode input end of the optical fiber mode selection coupler, and 32 is the few-mode output end of the optical fiber mode selection coupler. Reference numeral 51 denotes a first port of the optical coupler, and 52 denotes a second port of the optical coupler.
The laser beam output by the ultra-short pulse laser pump source 1 passes through the high nonlinear optical fiber 2 to generate a Cerenkov radiation effect, and the ultra-short pulse wave band is up-converted to a visible light wave band. The high nonlinear optical fiber 2 and the optical fiber mode selection coupler 3 are welded to complete the mode conversion of visible light, and the fundamental mode LP is realized 01 Mode transition to LP 11 The mode at the few-mode output 32 of the fiber mode selection coupler causes the output light to be a vortex beam by spinning the polarization controller 4. And a section of light splitting coupler 5 is connected behind the few-mode output end 32 of the optical fiber mode selection coupler, and light spots and spectra are observed in the light splitting coupler from a 51 port of the light splitting coupler to the camera 6 and from a 52 port of the light splitting coupler to the spectrum analyzer 7 respectively.
The received spectrum is shown in fig. 2, when the wavelength of the ultra-short pulse laser 1 is 1.55mm, the high-nonlinearity optical fiber 2 is selected as the large-mode-field photonic crystal fiber LMA-8, when the input power is 1.756W, the corresponding dispersion wavelength is 660nm, and meanwhile, the dispersion wavelength can generate blue shift phenomenon along with the increase of the pumping power, so that the Cerenkov radiation effect can realize the conversion of light with the wave band of 1.55mm into the visible light wave band.
When the wavelength of the ultra-short pulse laser 1 is 1.55mm, and the high-nonlinearity optical fibers 2 are selected to be large-mode-field photonic crystal fibers LMA-5 and LMA-8, as shown in fig. 3, the detected light spots can be detected in the camera 6 by extruding the optical fibers through the polarization controller 4 at the few-mode output end 32 of the optical fiber mode selection coupler 3, and after interference, fork-shaped fringes can be observed, which prove to be visible vortex light beams.
Fig. 4 is a schematic structural diagram of two ways of regular regulation and control of an output mode according to the present invention, and there is uncertainty in using a polarization controller to regulate vortex light, so in order to directly obtain stable vortex light output, it is proposed to perform regular regulation and control on the output mode of the few-mode output end 32 of the optical fiber mode selection coupler 3 in two ways, and directly output stable vortex light beams. The left graph regulates and controls the output mode by rotating the angle of the polarization maintaining optical fiber 8 and utilizing the difference of the transmission speed of the orthogonal mode by the fast and slow axes of the polarization maintaining optical fiber, and on the basis of fixing the length 8 of the polarization maintaining optical fiber, the initial phase is determined, and the vortex rotation can be directly obtained by rotating the angle of pi/2 of the polarization maintaining optical fiber. The rotation angle and the corresponding light spot and interference pattern are shown in fig. 5. The right image realizes mode regulation by rotating the angle of the quarter wave plate 9 and the polarizer 10, when the output mode of the few-mode output end 32 of the fixed mode selection coupler 3 is a column vector mode, the quarter wave plate 9 breaks incident light into two orthogonal circular polarized vortex beams, and then the direction of the polarizer 10 is overlapped with one of the vortex beams to obtain a single circular polarized vortex beam, wherein different angles of the quarter wave plate 9 and the polarizer 10 and corresponding light spots and interference patterns are shown in fig. 6.
Fig. 5 shows that the light spot changes along with the rotation of the polarization maintaining fiber 8, when the angle of pi/2 is rotated, the annular light spot can be detected, the annular light spot is interfered, the spiral interference fringe can be seen, and the spiral interference fringe is determined to be a vortex light beam.
FIG. 6 shows that four sets of LPs can be obtained as the angle of the quarter wave plate 9 and polarizer 10 is rotated 11 Mode and two groups of annular beams, the two groups of annular beams are OAM after interference +1 And OAM -1 。
According to the femtosecond visible vortex light laser based on the optical fiber internal transverse mode modulation, the femtosecond laser pumping source is used as an excitation light source to pump the high-nonlinearity optical fiber, so that the Cerenkov radiation effect is generated, and the femtosecond visible light pulse can be directly obtained. The phase matching curve of the Cerenkov radiation effect is simulated by simulation calculation, so that different scattered wave wavelengths corresponding to different nonlinear optical fibers can be obtained. The visible light mode selection coupler of the corresponding wave band is prepared according to different dispersion wave wavelengths, light transmitted in the high nonlinear optical fiber can be transmitted into the optical fiber mode selection coupler with smaller loss through fine fusion, the mode conversion of the all-fiber structure enables the mode conversion purity and efficiency to be higher, and LP can be obtained only through adjustment of a polarization controller at an output end 11 Mode or vortex light beam, easy operation and compatibility are strong. And different optical fibers are replaced, so that the femtosecond vortex pulse output of the whole visible light wave band can be realized. At the same time, lead toThe polarization-maintaining optical fiber and wave plate are used for adjusting, so that the output high-order mode can be controlled and can be stably transmitted in the optical fiber under the condition that the polarization controller is not manually adjusted.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (4)
1. A femtosecond visible vortex light laser based on transverse mode modulation in an optical fiber, which is characterized by comprising:
the ultra-short pulse laser pumping source is used for generating a pumping light signal;
the high nonlinear optical fiber is connected with the ultrashort pulse laser pumping source and is used for transmitting the pumping light signals, enabling the pumping light signals to generate nonlinear frequency conversion effect, converting the light signal generation wave band into a visible light wave band and calculating to obtain corresponding dispersion wave wavelengths;
the optical fiber mode selection coupler is connected with the high nonlinear optical fiber and is used for adjusting the optical fiber signal mode to realize mode conversion;
the polarization controller is connected with the optical fiber mode selection coupler and is used for outputting visible vortex light;
the optical fiber also comprises a polarization maintaining optical fiber; or also includes a quarter wave plate and a polarizer;
the polarization maintaining optical fiber is welded to the optical fiber mode selection coupler and is used for regulating and controlling an optical fiber signal mode under the condition that the polarization controller is not arranged;
the polarization maintaining optical fiber is of a fast and slow axis structure supporting visible light high-order mode transmission;
the quarter wave plate and the polarizer are connected with the optical fiber mode selection coupler and are used for regulating and controlling an optical fiber signal mode under the condition that the polarization controller is not arranged.
2. The femtosecond visible vortex light laser based on the intra-fiber transverse mode modulation according to claim 1,
the high nonlinear optical fiber comprises an input end and an output end;
the optical fiber mode selection coupler is formed by coupling a single-mode optical fiber and a few-mode optical fiber according to a set fiber core mode, and comprises a single-mode input end and a few-mode output end;
the input end of the high-nonlinearity optical fiber is connected with the ultrashort pulse laser pumping source, and the output end of the high-nonlinearity optical fiber is connected with the single-mode input end of the optical fiber mode selection coupler.
3. The femtosecond visible vortex light laser based on the intra-fiber transverse mode modulation according to claim 2,
the few-mode output end is connected with the polarization controller;
the few-mode output end is also connected with a light splitting coupler, and the light splitting coupler comprises a first port and a second port;
the first port is connected with a camera, and the second port is connected with a spectrum analyzer; the camera and the spectrum analyzer are used for observing light spots and spectrums.
4. The femtosecond visible vortex light laser based on the intra-fiber transverse mode modulation according to claim 1,
the wavelength of the dispersion wave is adjustable by changing the type of the high nonlinear optical fiber, the power and the pulse width of the ultra-short pulse laser pumping source.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105449501A (en) * | 2015-12-29 | 2016-03-30 | 中国电子科技集团公司第十一研究所 | Fiber laser |
| CN105870768A (en) * | 2016-05-28 | 2016-08-17 | 上海大学 | Optical vortex fiber laser based on mode conversion coupling |
| CN111638192A (en) * | 2020-06-08 | 2020-09-08 | 南京大学 | Tunable pumping-detection system based on super-continuum spectrum light source |
| CN112117629A (en) * | 2020-09-23 | 2020-12-22 | 上海大学 | All-fiber high-order mode Brillouin erbium-doped laser based on acousto-optic device |
| CN113054520A (en) * | 2021-03-12 | 2021-06-29 | 中国人民解放军国防科技大学 | Pure visible light super-continuum spectrum light source based on semiconductor laser diode pumping |
| CN113764964A (en) * | 2021-10-15 | 2021-12-07 | 清华大学 | Design of 1-micron waveband all-fiber femtosecond vortex laser |
-
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- 2022-01-28 CN CN202210107061.2A patent/CN114447754B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105449501A (en) * | 2015-12-29 | 2016-03-30 | 中国电子科技集团公司第十一研究所 | Fiber laser |
| CN105870768A (en) * | 2016-05-28 | 2016-08-17 | 上海大学 | Optical vortex fiber laser based on mode conversion coupling |
| CN111638192A (en) * | 2020-06-08 | 2020-09-08 | 南京大学 | Tunable pumping-detection system based on super-continuum spectrum light source |
| CN112117629A (en) * | 2020-09-23 | 2020-12-22 | 上海大学 | All-fiber high-order mode Brillouin erbium-doped laser based on acousto-optic device |
| CN113054520A (en) * | 2021-03-12 | 2021-06-29 | 中国人民解放军国防科技大学 | Pure visible light super-continuum spectrum light source based on semiconductor laser diode pumping |
| CN113764964A (en) * | 2021-10-15 | 2021-12-07 | 清华大学 | Design of 1-micron waveband all-fiber femtosecond vortex laser |
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