CN213692641U - Tunable 2-micron mode-locked fiber laser - Google Patents
Tunable 2-micron mode-locked fiber laser Download PDFInfo
- Publication number
- CN213692641U CN213692641U CN202021848685.2U CN202021848685U CN213692641U CN 213692641 U CN213692641 U CN 213692641U CN 202021848685 U CN202021848685 U CN 202021848685U CN 213692641 U CN213692641 U CN 213692641U
- Authority
- CN
- China
- Prior art keywords
- fiber
- mode
- laser
- polarization
- polarization controller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000000835 fiber Substances 0.000 title claims abstract description 145
- 230000010287 polarization Effects 0.000 claims abstract description 162
- 230000001419 dependent effect Effects 0.000 claims abstract description 47
- 239000013307 optical fiber Substances 0.000 claims abstract description 43
- 229910052775 Thulium Inorganic materials 0.000 claims abstract description 7
- FRNOGLGSGLTDKL-UHFFFAOYSA-N thulium atom Chemical compound [Tm] FRNOGLGSGLTDKL-UHFFFAOYSA-N 0.000 claims abstract description 7
- 230000000694 effects Effects 0.000 claims abstract description 6
- 230000003287 optical effect Effects 0.000 claims description 9
- 238000006073 displacement reaction Methods 0.000 abstract description 5
- 230000033228 biological regulation Effects 0.000 abstract description 4
- 238000001228 spectrum Methods 0.000 description 7
- 239000006096 absorbing agent Substances 0.000 description 6
- 230000009471 action Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000010355 oscillation Effects 0.000 description 6
- 230000008901 benefit Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009022 nonlinear effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000009103 reabsorption Effects 0.000 description 2
- 230000009102 absorption Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Images
Landscapes
- Lasers (AREA)
Abstract
The utility model provides a tunable 2 micron mode locking fiber laser, include: the device comprises a pump laser, a wavelength division multiplexer, a thulium-doped gain fiber, a coupler, a single-mode fiber, a first polarization controller, a polarization-dependent isolator and a second polarization controller; the pump laser is connected with a wavelength division multiplexer, and the wavelength division multiplexer is connected with the thulium-doped gain optical fiber; the thulium-doped gain fiber is connected with the coupler, the coupler is connected with the single-mode fiber, the single-mode fiber is connected with the second polarization controller, the second polarization controller is connected with the polarization-related isolator, and the polarization-related isolator is connected with the first polarization controller. This application realizes mode locking fiber laser's long wave band gain displacement effect through the length of regulation and control thulium gain optic fibre, combines with the mode locking component that first polarization controller, the relevant isolator of polarization and second polarization controller constitute simultaneously, can obtain the mode locking tuning range bigger than traditional tuning mode, and laser simple structure, with low costs.
Description
Technical Field
The utility model belongs to the technical field of laser, what especially relate to is a tunable 2 micron mode locking fiber laser.
Background
The fiber laser has the characteristics of good beam quality, simple structure, low cost, easiness in operation, strong external interference resistance, high precision, high efficiency, low loss and the like, and is widely concerned by people. The tunable fiber laser has the advantages of simple structure, flexible wavelength and the like, and can replace a plurality of single-wavelength fiber lasers to become an ideal light source of a dense wavelength division multiplexing system. Compared with a short-wavelength (1 μm, 1.5 μm) tunable laser source, a tunable laser with a 2 μm waveband has unique advantages in laser medical treatment, radar, environmental monitoring, non-metal processing and human eye safety directions, and becomes a research hotspot in recent years.
At present, there are two main schemes for realizing a tunable laser with a 2 μm waveband: the first method is realized by adjusting a deflection controller, but the tunable range of the laser obtained by the scheme is small; the second method is realized by adding a tunable filter or a grating in an optical resonant cavity of a laser, but the scheme is limited by the manufacturing process and parameters of the filter and the grating, and the cost is high.
Therefore, the prior art is subject to further improvement.
SUMMERY OF THE UTILITY MODEL
In view of the above deficiencies in the prior art, the present invention provides a tunable 2 μm mode-locked fiber laser, which overcomes the defects of small tunable range, limited manufacturing process and parameters of filters and gratings, and high cost of the existing tunable 2 μm band laser.
The utility model discloses an embodiment is a tunable 2 micron mode locking fiber laser, wherein, include: the device comprises a pump laser, a wavelength division multiplexer, a thulium-doped gain fiber, a coupler, a single-mode fiber, a first polarization controller, a polarization-dependent isolator and a second polarization controller; wherein,
the pump laser is connected with the wavelength division multiplexer, the wavelength division multiplexer is connected with the thulium-doped gain optical fiber, and pulse laser generated by the pump laser enters the thulium-doped gain optical fiber through the wavelength division multiplexer to generate gain which is used for amplifying an optical signal in a cavity;
the thulium-doped gain optical fiber is connected with the coupler, and output light is output through the coupler;
the coupler is connected with the single-mode fiber, the single-mode fiber is connected with the second polarization controller, the second polarization controller is connected with the polarization-dependent isolator, the polarization-dependent isolator is connected with the first polarization controller, and the first polarization controller, the polarization-dependent isolator and the second polarization controller are used as mode locking elements to realize nonlinear deflection effect passive mode locking;
the first polarization controller is connected with the wavelength division multiplexer to form an annular cavity;
the tunable 2-micron mode-locked fiber laser is characterized in that the working wavelength of the pump laser is 1570nm +/-2 nm.
The tunable 2-micron mode-locked fiber laser comprises a wavelength division multiplexer, a first port, a second port and a third port, wherein the wavelength division multiplexer is connected with the first port and the second port; the first port is connected with the pump laser, the second port is connected with the thulium-doped gain optical fiber, and the third port is connected with the first polarization controller.
The tunable 2-micron mode-locked fiber laser is characterized in that the wavelength division multiplexer is a 1570nm +/-10 nm/2000nm +/-10 nm fiber wavelength division multiplexer, the first port is a 1570nm +/-10 nm optical input end, and the third port is a 2000nm +/-10 nm optical input end.
The tunable 2-micron mode-locked fiber laser is characterized in that the thulium-doped gain fiber is 2-10 m in length.
The tunable 2-micrometer mode-locked fiber laser is characterized in that the coupler is a 90:10 fiber coupler, and the working wavelength of the coupler is 2000nm +/-10 nm.
The tunable 2-micrometer mode-locked fiber laser comprises a coupler and a single mode fiber, wherein the coupler comprises a fourth port and a fifth port, the fourth port is a 10% end, the fourth port is a laser output end, the fifth port is a 90% end, and the fifth port is connected with the single mode fiber.
The tunable 2-micron mode-locked fiber laser is characterized in that the working wavelength of the polarization-dependent isolator is 2000nm +/-10 nm.
The tunable 2-micrometer mode-locked fiber laser is characterized in that the length of the single-mode fiber is 20-30 m.
Beneficial effect, the utility model provides a tunable 2 micron mode locking fiber laser realizes the gain displacement effect of mode locking fiber laser at the long wave band through the length of regulation and control thulium gain optic fibre, combines with the mode locking component that first polarization controller, the relevant isolator of polarization and second polarization controller constitute simultaneously, can obtain the mode locking tuning range bigger than traditional tuning mode, and laser structure is simple, with low costs.
Drawings
Fig. 1 is a schematic structural diagram of a tunable 2-micron mode-locked fiber laser provided in an embodiment of the present invention;
fig. 2 is a spectrum of a tunable 2 micron mode-locked fiber laser provided in embodiment 1 of the present invention;
fig. 3 is a spectrum diagram of a tunable 2 μm mode-locked fiber laser provided in embodiment 5 of the present invention.
The various symbols in the drawings: 1. a pump laser; 2. a wavelength division multiplexer; 3. a thulium doped gain fiber; 4. A coupler; 5. a single mode optical fiber; 6. a first polarization controller; 7. a polarization dependent isolator; 8. a second polarization controller; 2a, a first port; 2b, a second port; 2c, a third port; 4a, a fourth port; 4b, a fifth port.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the embodiments and claims, the terms "a" and "an" can mean "one or more" unless the article is specifically limited.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The existing schemes for realizing the tunable laser with the 2 mu m wave band mainly comprise two types: the first method is realized by adjusting a deflection controller, but the tunable range of the laser obtained by the scheme is small; the second method is realized by adding a tunable filter or a grating in an optical resonant cavity of a laser, but the scheme is limited by the manufacturing process and parameters of the filter and the grating, and the cost is high. In order to solve the above problem, the utility model provides a tunable 2 micron mode locking fiber laser, as shown in figure 1, include: the optical fiber polarization controller comprises a pump laser 1, a wavelength division multiplexer 2, a thulium-doped gain fiber 3, a coupler 4, a single-mode fiber 5, a first polarization controller 6, a polarization-dependent isolator 7 and a second polarization controller 8. The pumping laser 1 is connected with the wavelength division multiplexer 2, the wavelength division multiplexer 2 is connected with the thulium-doped gain fiber 3, and pulse laser generated by the pumping laser 1 enters the thulium-doped gain fiber 3 through the wavelength division multiplexer 2 to generate gain which is used for amplifying an optical signal in a cavity; the thulium-doped gain fiber 3 is connected with the coupler 4, and output light is output through the coupler 4; the coupler 4 is connected to the single-mode fiber 5, the single-mode fiber 5 is connected to the second polarization controller 8, the second polarization controller 8 is connected to the polarization-dependent isolator 7, the polarization-dependent isolator 7 is connected to the first polarization controller 6, and the first polarization controller 6, the polarization-dependent isolator 7, and the second polarization controller 8 are used as mode locking elements to realize nonlinear deflection passive mode locking; the first polarization controller 6 is connected with the wavelength division multiplexer 2 to form an annular cavity.
In specific implementation, pulse laser generated by the pump laser 1 enters the thulium-doped gain fiber 3 after passing through the wavelength division multiplexer 2,3H6tm of radical states3+The particles absorb the energy of the pulse laser and produce stimulated absorption transition to3F4Energy level of following3F4The more particles accumulate at the energy level, the more3F4The particles on the energy level are inverted to generate stimulated radiation transition, and 2 mu m pulse laser output is generated.
Further, in the ring cavity, the first polarization controller 6, the polarization-dependent isolator 7 and the second polarization controller 8 form a mode locking element, the polarization-dependent isolator 7 has dual functions of an isolator and a polarizer, the polarization-dependent isolator 7 not only ensures that light in the cavity is conducted in one direction, but also enables output light to be changed into linearly polarized light, the linearly polarized light is changed into elliptically polarized light through the first polarization controller 6, and the elliptically polarized light can be regarded as the synthesis of two orthogonal linear polarization components. In the transmission process of the pulse laser, phase shifts caused by nonlinear effects such as self-phase modulation and cross-phase modulation are respectively acted on two orthogonal polarization components to enable the polarization state of the pulse laser to generate nonlinear evolution, and the final result is that the elliptical polarized light in the cavity is continuously accumulated along with the nonlinear effects to rotate, the polarization rotation degrees of the pulse laser with different intensities are different, and the transmissivity of the pulse laser with different intensities is different when the pulse laser passes through the second polarization controller 8, so that the first polarization controller 6, the polarization-dependent isolator 7 and the second polarization controller 8 form a mode-locked spectrum with a certain period while realizing the cavity.
Meanwhile, the pulse laser generated by the pump laser 1 enters the thulium-doped gain fiber 3 after passing through the wavelength division multiplexer 2, and Tm is3+The energy level is a two-level system, each energy level has a plurality of sub-energy levels, and energy loss occurs when the sub-energy levels transition downwards. When the in-band reabsorption occurs, the radiated photons are absorbed, energy is lost when the photons transit downwards in the energy band, so that a photon with a longer wavelength than the previous wavelength is radiated, the process is repeated among the energy bands, the population inversion degree is weakened, the red shift of the whole spectrum is caused, and the tunability of the spectrum is realized.
During specific implementation, the length of thulium-doped gain optical fiber 3 is 2m ~ 10m, and along with thulium-doped gain optical fiber 3 length increase, whole reabsorption process is strengthened greatly to realize big wavelength tunable range, realize the long wave band gain displacement effect of mode locking fiber laser through the length of regulation and control thulium-doped gain optical fiber 3, simultaneously with first polarization controller 6 polarization-dependent isolator 7 and the mode locking component that second polarization controller 8 constitutes combines, can obtain the mode locking tuning range bigger than traditional tuning mode, and laser simple structure, with low costs.
Further, the working wavelength of the pump laser 1 is 1570nm ± 2nm, the wavelength division multiplexer 2 is a 1570nm ± 10nm/2000nm ± 10nm optical fiber wavelength division multiplexer, and the damage threshold of the wavelength division multiplexer 2 is more than 2W. Wavelength division multiplexer 2 includes first port 2a, second port 2b and third port 2c, first port 2a as 1570nm 10nm light input end with pump laser 1 connects, third port 2c as 2000nm 10nm light input end with first polarization controller 6 is connected, second port 2b with it connects to mix thulium gain optical fiber 3.
Further, the coupler 4 is a 90:10 optical fiber coupler, and the working wavelength of the coupler 4 is 2000nm +/-10 nm. The coupler 4 includes a fourth port 4a and a fifth port 4b, the fourth port 4a is a 10% end, the fourth port 4a is a laser output end, the fifth port 4b is a 90% end, and the fifth port 4b is connected to the single-mode fiber 5. After the pulsed laser generated by the pump laser 1 circulates once in the ring cavity, 10% of the pulsed laser is output from the fourth port 4a of the coupler 4, and the remaining 90% of the pulsed laser continues to circulate in the cavity.
In specific implementation, the working wavelength of the polarization-dependent isolator 7 is 2000nm ± 10nm, the length of the single-mode fiber 5 is 20m to 30m, and the single-mode fiber 5 is used for increasing the nonlinearity and birefringence of light in the cavity.
Compared with the prior art, the embodiment of the utility model provides an advantage lies in:
1. the embodiment of the utility model adopts the all-fiber structure, the whole structure of the laser is compact, the cost is low, the operation is easy, and the work is stable;
2. the embodiment of the utility model provides an in through changing thulium gain optical fiber length of mixing, combine together gain displacement principle and the rotatory evolution of non-linear polarization in order to obtain the tunable purpose of tunable 2 microns mode locking fiber laser, compare in the bigger mode locking tuning range of traditional tuning mode to laser structure is simple, and is with low costs.
The invention is further explained below by means of specific embodiments.
Example 1
A tunable 2 micron mode-locked fiber laser, the fiber laser comprising:
as shown in fig. 1, a pump laser 1, a wavelength division multiplexer 2, a thulium-doped gain fiber 3, a coupler 4, a single-mode fiber 5, a first polarization controller 6, a polarization-dependent isolator 7, and a second polarization controller 8; wherein the output wavelength of the pump laser 1 is 1570 nm; the wavelength division multiplexer 2 is a 2-micrometer optical fiber wavelength division multiplexer, the working wavelength is 2000nm/1570nm, and the damage threshold reaches 2W; the thulium-doped gain optical fiber 3 is 2 m; the coupler 4 is a 90:10 optical fiber coupler, the working wavelength is 2000nm, and the 10% end is a laser output end; the length of the single-mode optical fiber 5 is 30 m; the working wavelength of the polarization-dependent isolator 7 is 2000 nm;
the tunable 2-micron mode-locked fiber laser is of an all-fiber structure and is compact in structure, and pulse laser generated by the pump laser 1 enters the thulium-doped gain fiber 3 after passing through the wavelength division multiplexer 2 to generate 2-micron pulse laser. In the ring cavity, pulse laser is converted into linearly polarized light through a polarization-dependent isolator 7 and then converted into elliptically polarized light through a first polarization controller 6, the elliptically polarized light rotates in a polarization state under cross phase modulation and self phase modulation, and mode selection continuous oscillation is realized under the action of a second polarization controller 8 to achieve laser output. The first polarization controller 6, the polarization-dependent isolator 7 and the second polarization controller 8 together function as a saturable absorber, and passive mode locking is realized. Meanwhile, the tunable operation of the mode-locked laser can be realized by controlling the length of the thulium-doped gain fiber 3 to be 2m and finely adjusting the second polarization controller 8 to change birefringence. Fig. 2 is a spectrum diagram of the tunable 2 μm mode-locked fiber laser provided in this embodiment, and it can be seen from fig. 2 that a large-tuning mode-locked fiber laser with a mode-locked spectrum center wavelength ranging from 1828.45nm to 1934.05nm can be obtained at the length of the gain fiber.
Example 2
A tunable 2 micron mode-locked fiber laser, the fiber laser comprising:
as shown in fig. 1, a pump laser 1, a wavelength division multiplexer 2, a thulium-doped gain fiber 3, a coupler 4, a single-mode fiber 5, a first polarization controller 6, a polarization-dependent isolator 7, and a second polarization controller 8; wherein, the output wavelength of the pump laser 1 is 1568 nm; the wavelength division multiplexer 2 is a 2-micrometer optical fiber wavelength division multiplexer, the working wavelength is 1990nm/1580nm, and the damage threshold reaches 2W; the thulium-doped gain optical fiber 3 is 3 m; the coupler 4 is a 90:10 optical fiber coupler, the working wavelength is 1990nm, and the 10% end is a laser output end; the length of the single-mode optical fiber 5 is 20 m; the working wavelength of the polarization-dependent isolator 7 is 1990 nm;
the tunable 2-micron mode-locked fiber laser is of an all-fiber structure and is compact in structure, and pulse laser generated by the pump laser 1 enters the thulium-doped gain fiber 3 after passing through the wavelength division multiplexer 2 to generate 2-micron pulse laser. In the ring cavity, pulse laser is converted into linearly polarized light through a polarization-dependent isolator 7 and then converted into elliptically polarized light through a first polarization controller 6, the elliptically polarized light rotates in a polarization state under cross phase modulation and self phase modulation, and mode selection continuous oscillation is realized under the action of a second polarization controller 8 to achieve laser output. The first polarization controller 6, the polarization-dependent isolator 7 and the second polarization controller 8 together function as a saturable absorber, and passive mode locking is realized. Meanwhile, the tunable operation of the mode-locked laser can be realized by controlling the length of the thulium-doped gain fiber 3 to be 3m and finely adjusting the second polarization controller 8 to change birefringence, and the large-tuning mode-locked fiber laser with the mode-locked spectrum center wavelength ranging from 1851.3nm to 1947.0nm can be obtained under the length of the gain fiber.
Example 3
A tunable 2 micron mode-locked fiber laser, the fiber laser comprising:
as shown in fig. 1, a pump laser 1, a wavelength division multiplexer 2, a thulium-doped gain fiber 3, a coupler 4, a single-mode fiber 5, a first polarization controller 6, a polarization-dependent isolator 7, and a second polarization controller 8; wherein the output wavelength of the pump laser 1 is 1571 nm; the wavelength division multiplexer 2 is a 2-micrometer optical fiber wavelength division multiplexer, the working wavelength is 2010nm/1565nm, and the damage threshold reaches 2W; the thulium-doped gain optical fiber 3 is 5 m; the coupler 4 is a 90:10 optical fiber coupler, the working wavelength is 1998nm, and the 10% end is a laser output end; the length of the single-mode optical fiber 5 is 28 m; the working wavelength of the polarization-dependent isolator 7 is 1980 nm;
the tunable 2-micron mode-locked fiber laser is of an all-fiber structure and is compact in structure, and pulse laser generated by the pump laser 1 enters the thulium-doped gain fiber 3 after passing through the wavelength division multiplexer 2 to generate 2-micron pulse laser. In the ring cavity, pulse laser is converted into linearly polarized light through a polarization-dependent isolator 7 and then converted into elliptically polarized light through a first polarization controller 6, the elliptically polarized light rotates in a polarization state under cross phase modulation and self phase modulation, and mode selection continuous oscillation is realized under the action of a second polarization controller 8 to achieve laser output. The first polarization controller 6, the polarization-dependent isolator 7 and the second polarization controller 8 together function as a saturable absorber, and passive mode locking is realized. Meanwhile, the tunable operation of the mode-locked laser can be realized by controlling the length of the thulium-doped gain fiber 3 to be 5m and finely adjusting the second polarization controller 8 to change birefringence, and the large-tuning mode-locked fiber laser with the mode-locked spectrum center wavelength ranging from 1865.99nm to 1959.26nm can be obtained under the length of the gain fiber.
Example 4
A tunable 2 micron mode-locked fiber laser, the fiber laser comprising:
as shown in fig. 1, a pump laser 1, a wavelength division multiplexer 2, a thulium-doped gain fiber 3, a coupler 4, a single-mode fiber 5, a first polarization controller 6, a polarization-dependent isolator 7, and a second polarization controller 8; wherein, the output wavelength of the pump laser 1 is 1567 nm; the wavelength division multiplexer 2 is a 2-micrometer optical fiber wavelength division multiplexer, the working wavelength is 1996nm/1572nm, and the damage threshold reaches 2W; the thulium-doped gain optical fiber 3 is 7 m; the coupler 4 is a 90:10 optical fiber coupler, the working wavelength is 2001nm, and a 10% end is a laser output end; the length of the single-mode optical fiber 5 is 26 m; the working wavelength of the polarization-dependent isolator 7 is 2010 nm;
the tunable 2-micron mode-locked fiber laser is of an all-fiber structure and is compact in structure, and pulse laser generated by the pump laser 1 enters the thulium-doped gain fiber 3 after passing through the wavelength division multiplexer 2 to generate 2-micron pulse laser. In the ring cavity, pulse laser is converted into linearly polarized light through a polarization-dependent isolator 7 and then converted into elliptically polarized light through a first polarization controller 6, the elliptically polarized light rotates in a polarization state under cross phase modulation and self phase modulation, and mode selection continuous oscillation is realized under the action of a second polarization controller 8 to achieve laser output. The first polarization controller 6, the polarization-dependent isolator 7 and the second polarization controller 8 together function as a saturable absorber, and passive mode locking is realized. Meanwhile, the tunable operation of the mode-locked laser can be realized by controlling the length of the thulium-doped gain fiber 3 to be 7m and finely adjusting the second polarization controller 8 to change birefringence, and the large-tuning mode-locked fiber laser with the mode-locked spectrum center wavelength ranging from 1882.27nm to 1960.00nm can be obtained under the length of the gain fiber.
Example 5
A tunable 2 micron mode-locked fiber laser, the fiber laser comprising:
as shown in fig. 1, a pump laser 1, a wavelength division multiplexer 2, a thulium-doped gain fiber 3, a coupler 4, a single-mode fiber 5, a first polarization controller 6, a polarization-dependent isolator 7, and a second polarization controller 8; wherein the output wavelength of the pump laser 1 is 1572 nm; the wavelength division multiplexer 2 is a 2-micron optical fiber wavelength division multiplexer, the working wavelength is 1999nm/1570nm, and the damage threshold reaches 2W; the thulium-doped gain optical fiber 3 is 8 m; the coupler 4 is a 90:10 optical fiber coupler, the working wavelength is 2010nm, and a 10% end is a laser output end; the length of the single-mode optical fiber 5 is 30 m; the working wavelength of the polarization-dependent isolator 7 is 1994 nm;
the tunable 2-micron mode-locked fiber laser is of an all-fiber structure and is compact in structure, and laser beams output by the pump laser 1 enter the thulium-doped gain fiber 3 after passing through the wavelength division multiplexer 2 to generate 2-micron pulse laser. In the ring cavity, pulse laser is converted into linearly polarized light through a polarization-dependent isolator 7 and then converted into elliptically polarized light through a first polarization controller 6, the elliptically polarized light rotates in a polarization state under cross phase modulation and self phase modulation, and mode selection continuous oscillation is realized under the action of a second polarization controller 8 to achieve laser output. The first polarization controller 6, the polarization-dependent isolator 7 and the second polarization controller 8 together function as a saturable absorber, and passive mode locking is realized. Meanwhile, the tunable operation of the mode-locked laser can be realized by controlling the length of the thulium-doped gain fiber 3 to be 8m and finely adjusting the second polarization controller 8 to change birefringence. Fig. 3 is a spectrum diagram of the tunable 2 μm mode-locked fiber laser provided in this embodiment, and it can be seen from fig. 3 that a large-tuning mode-locked fiber laser with a mode-locked spectrum center wavelength ranging from 1895.01nm to 1969.26nm can be obtained at the length of the gain fiber.
Example 6
A tunable 2 micron mode-locked fiber laser, the fiber laser comprising:
as shown in fig. 1, a pump laser 1, a wavelength division multiplexer 2, a thulium-doped gain fiber 3, a coupler 4, a single-mode fiber 5, a first polarization controller 6, a polarization-dependent isolator 7, and a second polarization controller 8; wherein the output wavelength of the pump laser 1 is 1570 nm; the wavelength division multiplexer 2 is a 2-micron optical fiber wavelength division multiplexer, the working wavelength is 1995nm/1565nm, and the damage threshold reaches 2W; the thulium-doped gain optical fiber 3 is 10 m; the coupler 4 is a 90:10 optical fiber coupler, the working wavelength is 1997nm, and the 10% end is the laser output end; the length of the single-mode optical fiber 5 is 29 m; the working wavelength of the polarization-dependent isolator 7 is 2006 nm;
the tunable 2-micron mode-locked fiber laser is of an all-fiber structure and is compact in structure, and pulse laser generated by the pump laser 1 enters the thulium-doped gain fiber 3 after passing through the wavelength division multiplexer 2 to generate 2-micron pulse laser. In the ring cavity, pulse laser is converted into linearly polarized light through a polarization-dependent isolator 7 and then converted into elliptically polarized light through a first polarization controller 6, the elliptically polarized light rotates in a polarization state under cross phase modulation and self phase modulation, and mode selection continuous oscillation is realized under the action of a second polarization controller 8 to achieve laser output. The first polarization controller 6, the polarization-dependent isolator 7 and the second polarization controller 8 together function as a saturable absorber, and passive mode locking is realized. Meanwhile, the tunable operation of the mode-locked laser can be realized by controlling the length of the thulium-doped gain fiber 3 to be 10m and finely adjusting the second polarization controller 8 to change birefringence, and the large-tuning mode-locked fiber laser with the mode-locked spectrum center wavelength ranging from 1917nm to 1981.35nm can be obtained under the length of the gain fiber.
To sum up, the utility model provides a tunable 2 micron mode locking fiber laser, include: the device comprises a pump laser, a wavelength division multiplexer, a thulium-doped gain fiber, a coupler, a single-mode fiber, a first polarization controller, a polarization-dependent isolator and a second polarization controller; the pump laser is connected with a wavelength division multiplexer, and the wavelength division multiplexer is connected with the thulium-doped gain optical fiber; the thulium-doped gain fiber is connected with the coupler, the coupler is connected with the single-mode fiber, the single-mode fiber is connected with the second polarization controller, the second polarization controller is connected with the polarization-related isolator, the polarization-related isolator is connected with the first polarization controller, and the first polarization controller is connected with the wavelength division multiplexer to form an annular cavity. This application realizes mode locking fiber laser's long wave band gain displacement effect through the length of regulation and control thulium gain optic fibre, combines with the mode locking component that first polarization controller, the relevant isolator of polarization and second polarization controller constitute simultaneously, can obtain the mode locking tuning range bigger than traditional tuning mode, and laser simple structure, with low costs.
It should be understood that the application of the system of the present invention is not limited to the above examples, and that modifications and variations can be made by those skilled in the art in light of the above teachings, and all such modifications and variations are intended to fall within the scope of the appended claims.
Claims (9)
1. A tunable 2 micron mode-locked fiber laser, comprising: the device comprises a pump laser, a wavelength division multiplexer, a thulium-doped gain fiber, a coupler, a single-mode fiber, a first polarization controller, a polarization-dependent isolator and a second polarization controller; wherein,
the pump laser is connected with the wavelength division multiplexer, the wavelength division multiplexer is connected with the thulium-doped gain optical fiber, and pulse laser generated by the pump laser enters the thulium-doped gain optical fiber through the wavelength division multiplexer to generate gain which is used for amplifying an optical signal in a cavity;
the thulium-doped gain optical fiber is connected with the coupler, and output light is output through the coupler;
the coupler is connected with the single-mode fiber, the single-mode fiber is connected with the second polarization controller, the second polarization controller is connected with the polarization-dependent isolator, the polarization-dependent isolator is connected with the first polarization controller, and the first polarization controller, the polarization-dependent isolator and the second polarization controller are used as mode locking elements to realize nonlinear deflection effect passive mode locking;
and the first polarization controller is connected with the wavelength division multiplexer to form an annular cavity.
2. The tunable 2 μm mode-locked fiber laser of claim 1, wherein the operating wavelength of the pump laser is 1570nm ± 2 nm.
3. The tunable 2 micron mode locked fiber laser of claim 1, wherein the wavelength division multiplexer comprises a first port, a second port, and a third port; the first port is connected with the pump laser, the second port is connected with the thulium-doped gain optical fiber, and the third port is connected with the first polarization controller.
4. The tunable 2 micron mode locked fiber laser of claim 3, wherein the wavelength division multiplexer is a 1570nm ± 10nm/2000nm ± 10nm fiber wavelength division multiplexer, the first port is a 1570nm ± 10nm optical input, and the third port is a 2000nm ± 10nm optical input.
5. The tunable 2 μm mode-locked fiber laser according to claim 1, wherein the thulium doped gain fiber has a length of 2m to 10 m.
6. The tunable 2 μm mode-locked fiber laser of claim 1, wherein the coupler is a 90:10 fiber coupler having an operating wavelength of 2000nm ± 10 nm.
7. The tunable 2 micron mode locked fiber laser of claim 6, wherein the coupler comprises a fourth port and a fifth port, the fourth port is a 10% end, the fourth port is a laser output end, the fifth port is a 90% end, and the fifth port is connected to the single mode fiber.
8. The tunable 2 micron mode-locked fiber laser of claim 1, wherein the polarization dependent isolator has an operating wavelength of 2000nm ± 10 nm.
9. The tunable 2 μm mode-locked fiber laser according to claim 1, wherein the single mode fiber has a length of 20m to 30 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021848685.2U CN213692641U (en) | 2020-08-28 | 2020-08-28 | Tunable 2-micron mode-locked fiber laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021848685.2U CN213692641U (en) | 2020-08-28 | 2020-08-28 | Tunable 2-micron mode-locked fiber laser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213692641U true CN213692641U (en) | 2021-07-13 |
Family
ID=76745581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021848685.2U Expired - Fee Related CN213692641U (en) | 2020-08-28 | 2020-08-28 | Tunable 2-micron mode-locked fiber laser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213692641U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113675711A (en) * | 2021-08-24 | 2021-11-19 | 长春理工大学 | Wavelength tunable gain switch pulse fiber laser |
| CN114039266A (en) * | 2021-11-05 | 2022-02-11 | 重庆两江卫星移动通信有限公司 | Q-switched fiber laser based on all-fiber structure filter |
| CN117613655A (en) * | 2023-11-09 | 2024-02-27 | 厦门纽立特电子科技有限公司 | Wide tuning laser based on saturable absorber |
-
2020
- 2020-08-28 CN CN202021848685.2U patent/CN213692641U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113675711A (en) * | 2021-08-24 | 2021-11-19 | 长春理工大学 | Wavelength tunable gain switch pulse fiber laser |
| CN114039266A (en) * | 2021-11-05 | 2022-02-11 | 重庆两江卫星移动通信有限公司 | Q-switched fiber laser based on all-fiber structure filter |
| CN114039266B (en) * | 2021-11-05 | 2024-03-22 | 重庆两江卫星移动通信有限公司 | Q-switched fiber laser based on all-fiber structure filter |
| CN117613655A (en) * | 2023-11-09 | 2024-02-27 | 厦门纽立特电子科技有限公司 | Wide tuning laser based on saturable absorber |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN213692641U (en) | Tunable 2-micron mode-locked fiber laser | |
| DE19802845B4 (en) | Apparatus and method for generating high power femtosecond pulses by means of an optical fiber amplifier | |
| Luo et al. | Tunable and switchable multiwavelength passively mode-locked fiber laser based on SESAM and inline birefringence comb filter | |
| CN100438235C (en) | Optical fiber laser using rare earth-added fiber and wide band light source | |
| EP1727248A1 (en) | Nonlinear polarization pulse mode locked fiber laser at a wavelength of one micron | |
| JP2011018765A (en) | Optical fiber for optical amplification, optical fiber amplifier, and optical fiber laser | |
| CN107024816A (en) | Higher order dispersion compensation chirp spectrum widening system | |
| CN101483307A (en) | Polarization related outputting multiple wavelength and passive mode locking optical fiber laser | |
| CN107230927A (en) | 2 μm of mode locked fiber lasers based on SMF SIMF GIMF SMF optical fiber structures | |
| CN106129786A (en) | Tunable dual wavelength mode locked fiber laser based on tapered fiber | |
| Lin et al. | Tunable and switchable dual-wavelength dissipative soliton operation of a weak-birefringence all-normal-dispersion Yb-doped fiber laser | |
| CN109038188B (en) | Erbium-doped fiber laser and adjusting method | |
| EP1675227A1 (en) | Nonlinear polarization pulse mode locked fiber laser at a wavelength of one micron | |
| US7529278B2 (en) | Nonlinear polarization pulse shaping model locked fiber laser at one micron with photonic crystal (PC), photonic bandgap (PBG), or higher order mode (HOM) fiber | |
| CN102368585A (en) | High-repetition-frequency passive-mode-locking ultrashort-pulse all-fiber laser | |
| CN113764964A (en) | Design of 1-micron waveband all-fiber femtosecond vortex laser | |
| CN102610987A (en) | Switchable multi-wavelength erbium-doped optical fiber laser based on optical fiber Mach-Zehnder interferometer | |
| US20160028205A1 (en) | Fiber-Optic Laser Oscillator | |
| CN109273973B (en) | Dissipative soliton laser with 2-micron waveband | |
| CN109149328A (en) | A kind of low-repetition-frequency linear cavity picosecond ytterbium-doping optical fiber laser of ambient stable | |
| CN112490834A (en) | Mode-locking ytterbium-doped fiber laser based on multimode fiber eccentric fusion | |
| CN208459624U (en) | Super model interference filter and fiber optic wavelength tunable mode-locked laser | |
| US20070177642A1 (en) | Achieving ultra-short pulse in mode locked fiber lasers by flattening gain shape | |
| CN105633772A (en) | Chiral fiber grating-based all-fiber mode-locked fiber laser | |
| CN110021871A (en) | A method of realizing Gao Zhongying Wavelength tunable all -fiber ultrafast pulsed laser device and system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210713 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |