CN206379615U - A kind of all -fiber pulse dual-cavity laser of linear polarization output - Google Patents
A kind of all -fiber pulse dual-cavity laser of linear polarization output Download PDFInfo
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- CN206379615U CN206379615U CN201620964264.3U CN201620964264U CN206379615U CN 206379615 U CN206379615 U CN 206379615U CN 201620964264 U CN201620964264 U CN 201620964264U CN 206379615 U CN206379615 U CN 206379615U
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- 230000010287 polarization Effects 0.000 title claims abstract description 293
- 239000013307 optical fiber Substances 0.000 claims abstract description 86
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- 229910052761 rare earth metal Inorganic materials 0.000 claims description 13
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- 229910052691 Erbium Inorganic materials 0.000 claims description 6
- 229910052689 Holmium Inorganic materials 0.000 claims description 6
- 229910052779 Neodymium Inorganic materials 0.000 claims description 6
- 238000001069 Raman spectroscopy Methods 0.000 claims description 6
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- 229910052775 Thulium Inorganic materials 0.000 claims description 6
- 229910052769 Ytterbium Inorganic materials 0.000 claims description 6
- 229910052797 bismuth Inorganic materials 0.000 claims description 6
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims description 6
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- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 claims description 6
- KJZYNXUDTRRSPN-UHFFFAOYSA-N holmium atom Chemical compound [Ho] KJZYNXUDTRRSPN-UHFFFAOYSA-N 0.000 claims description 6
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 claims description 6
- 239000004038 photonic crystal Substances 0.000 claims description 6
- KZUNJOHGWZRPMI-UHFFFAOYSA-N samarium atom Chemical compound [Sm] KZUNJOHGWZRPMI-UHFFFAOYSA-N 0.000 claims description 6
- FRNOGLGSGLTDKL-UHFFFAOYSA-N thulium atom Chemical compound [Tm] FRNOGLGSGLTDKL-UHFFFAOYSA-N 0.000 claims description 6
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 claims description 6
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Abstract
The utility model discloses a kind of all -fiber pulse dual-cavity laser of linear polarization output, including pumping source, polarization maintaining optical fibre bundling device, the first polarization-maintaining gain fibre, the second polarization-maintaining gain fibre, first, second, third, fourth polarization-preserving fiber in reflection type Bragg grating, or including pumping source, polarization maintaining optical fibre wavelength division multiplexer, the first polarization-maintaining gain fibre, the second polarization-maintaining gain fibre, the first polarization-preserving fiber in reflection type Bragg grating, the second polarization-preserving fiber in reflection type Bragg grating, the 3rd polarization-preserving fiber in reflection type Bragg grating, polarization maintaining fiber ring device.The utility model uses the intermodulation effect structure design of dual resonant cavity, gain media and saturable absorber are used as by the use of doped fiber, the all-fiber that technology realizes polarization-maintaining laser is polarized with reference to new, design is simple, compact conformation, the linear polarization pulse laser output of stability and high efficiency can be realized, the characteristics of with high stability, high efficiency, high-energy.
Description
Technical Field
The utility model belongs to laser technology and nonlinear optics field especially relate to a full optical fiber pulse double-cavity laser of linear polarization output.
Background
The fiber laser has the advantages of small volume, light weight, high conversion efficiency, good output beam quality and the like, and is rapidly developed in recent years, and fiber lasers with different structures and characteristics are continuously developed. The appearance of the double-cladding large-mode-area (LMA) optical fiber enables a high-power optical fiber laser to be rapidly developed, and the near single-mode output of 1-2 kW is realized at present. However, most of the reports in the literature are random polarization outputs. And in many fields such as fiber-optic gyroscope, fiber-optic sensing, nonlinear frequency conversion, coherent light beam combination and the like, stable polarization characteristics of output laser are required to be kept.
In the research of polarization maintaining fiber lasers, the main mode for generating linear polarization laser is realized by space coupling or polarization maintaining fiber isolators. However, the space coupling mode has the defects of complex structure, poor stability, easy generation of section damage and the like; the polarization maintaining isolator realizes linear polarization so that the loss of output laser light is nearly half. In the research of the pulse laser, the laser output of nanosecond or sub-millisecond pulse width can be realized by adding an acousto-optic modulator, an electro-optic modulator or a solid saturable absorber in a cavity, however, the combination of an optical fiber and a nonlinear device can increase the complexity of the system, extra loss is introduced, the stability of the system is reduced, the environmental interference resistance is weak, and the industrialization and practical popularization are not facilitated.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is, in order to obtain stable efficient linear polarization pulse laser light source, avoid space components and parts or extra modulator to be used for pulse production and laser polarizing simultaneously, provide a full fiber pulse double-cavity laser of linear polarization output, need not to realize linear polarization pulse output with the help of space components and parts promptly, design simple, compact structure, have high stability, high efficiency, high energy's characteristics.
In order to solve the above problem, the utility model adopts the following technical scheme:
an all-fiber pulse dual-cavity laser with linearly polarized output comprises: the polarization maintaining fiber bragg grating light source comprises a pumping source, a polarization maintaining fiber beam combiner, a first polarization maintaining gain fiber, a second polarization maintaining gain fiber, a first reflection type polarization maintaining fiber bragg grating, a second reflection type polarization maintaining fiber bragg grating, a third reflection type polarization maintaining fiber bragg grating and a fourth reflection type polarization maintaining fiber bragg grating; wherein,
the pumping source is connected with the pumping input end of the polarization maintaining optical fiber beam combiner; the signal end of the polarization-maintaining optical fiber beam combiner is connected with one end of a Bragg grating of a first reflection-type polarization-maintaining optical fiber grating; the other end of the first reflection type polarization-maintaining fiber Bragg grating is connected with one end of a first polarization-maintaining gain fiber; the other end of the first polarization-preserving gain fiber is connected with one end of a second reflection-type polarization-preserving fiber Bragg grating; the second reflection type polarization-maintaining fiber Bragg grating is orthogonally welded with the first reflection type polarization-maintaining fiber Bragg grating, so that the reflection peaks of one pair of fast and slow axes are overlapped, and the reflection peaks of the other pair of fast and slow axes are staggered, and only one polarization mode is ensured to oscillate; the other end of the second reflection type polarization-maintaining fiber Bragg grating is connected with one end of the third reflection type polarization-maintaining fiber Bragg grating; the common end of the polarization-maintaining optical fiber combiner is connected with one end of a second polarization-maintaining gain optical fiber; the other end of the second polarization-maintaining gain fiber is connected with one end of a fourth reflection-type polarization-maintaining fiber Bragg grating;
the third reflection type polarization-maintaining fiber Bragg grating and the fourth reflection type polarization-maintaining fiber Bragg grating form a first resonant cavity; the first reflection type polarization-maintaining fiber Bragg grating and the second reflection type polarization-maintaining fiber Bragg grating form a second resonant cavity; the pump light generated by the pump source enters the first resonant cavity through the pump input end of the polarization maintaining fiber combiner, the second polarization maintaining gain fiber is pumped, the formed laser enters the second resonant cavity through the polarization maintaining fiber combiner and the first reflection type polarization maintaining fiber Bragg grating, the first polarization maintaining gain fiber is pumped to generate another wavelength laser, and the other wavelength laser generated by the second resonant cavity is output through the polarization maintaining fiber combiner, the second polarization maintaining gain fiber and the fourth reflection type polarization maintaining fiber Bragg grating in sequence.
Preferably, the reflectivities of the first, second, third and fourth reflective polarization-maintaining fiber bragg gratings are all R, where 0< R < 1.
Preferably, the pump source is one of a semiconductor laser, a solid laser, a gas laser, a fiber laser, and a raman laser, and the range of the center wavelength of the output pump light is: and lambda is more than or equal to 700nm and less than or equal to 2000nm, and the pumping mode is one of fiber core single-end pumping, fiber core double-end pumping, cladding single-end pumping and cladding double-end pumping.
Preferably, the polarization maintaining optical fiber combiner is a (2+1) x1 polarization maintaining optical fiber combiner or a (6+1) polarization maintaining optical fiber combiner.
Preferably, the first polarization maintaining gain fiber and the second polarization maintaining gain fiber are polarization maintaining fibers or photonic crystal polarization maintaining fibers doped with rare earth elements, and the doped rare earth elements are one or more of ytterbium (Yb), erbium (Er), holmium (Ho), thulium (Tm), neodymium (Nd), chromium (Cr), samarium (Sm) and bismuth (Bi).
An all-fiber pulse dual-cavity laser with linearly polarized output comprises: the device comprises a pumping source, a polarization-maintaining fiber wavelength division multiplexer, a first polarization-maintaining gain fiber, a second polarization-maintaining gain fiber, a first reflection type polarization-maintaining fiber Bragg grating, a second reflection type polarization-maintaining fiber Bragg grating, a third reflection type polarization-maintaining fiber Bragg grating and a polarization-maintaining fiber circulator; wherein,
the pump source is connected with the pump input end of the polarization-maintaining fiber wavelength division multiplexer, the common end of the polarization-maintaining fiber wavelength division multiplexer is connected with one end of a second polarization-maintaining gain fiber, the other end of the second polarization-maintaining gain fiber is connected with the incident end of a polarization-maintaining fiber circulator, the emergent end of the polarization-maintaining fiber circulator is connected with one end of a first reflection type polarization-maintaining fiber Bragg grating, the other end of the first reflection type polarization-maintaining fiber Bragg grating is connected with one end of a first polarization-maintaining gain fiber, and the other end of the first polarization-maintaining gain fiber is connected with one end of a second reflection type polarization-maintaining fiber Bragg grating; the second reflection type polarization-maintaining fiber Bragg grating is orthogonally welded with the first reflection type polarization-maintaining fiber Bragg grating, so that the reflection peaks of one pair of fast and slow axes are overlapped, and the reflection peaks of the other pair of fast and slow axes are staggered, and only one polarization mode is ensured to oscillate; the other end of the second reflection type polarization maintaining fiber Bragg grating is connected with a signal end of the polarization maintaining fiber wavelength division multiplexer; the common end of the polarization-maintaining optical fiber circulator is connected with a third reflection-type polarization-maintaining optical fiber Bragg grating;
the pump light generated by the pump source enters the second polarization-maintaining gain fiber through the pump input end of the polarization-maintaining fiber wavelength division multiplexer, then enters from the incident end of the polarization-maintaining fiber circulator, is output from the common end of the polarization-maintaining fiber circulator to reach a third reflection-type polarization-maintaining fiber Bragg grating, the third reflection-type polarization-maintaining fiber Bragg grating is a high-reflection-type grating, reflects the light back through the third reflection-type polarization-maintaining fiber Bragg grating, enters from the common end of the polarization-maintaining fiber circulator, is output from the emergent end of the polarization-maintaining fiber circulator, and enters the signal end of the polarization-maintaining fiber wavelength division multiplexer through the first reflection-type polarization-maintaining fiber Bragg grating, the first polarization-maintaining gain fiber and the second reflection-type polarization-maintaining fiber Bragg grating to form an annular cavity; a second resonant cavity is formed by the first reflection type polarization-maintaining fiber Bragg grating and the second reflection type polarization-maintaining fiber Bragg grating; the pump light passes through a second polarization maintaining gain fiber in the polarization maintaining fiber wavelength division multiplexer, the generated laser enters a second resonant cavity, the first polarization maintaining gain fiber is pumped, the laser with the other wavelength is output, and the laser sequentially passes through the polarization maintaining fiber wavelength division multiplexer, the second polarization maintaining gain fiber, the polarization maintaining fiber circulator and a third reflection type polarization maintaining fiber Bragg grating output cavity.
Preferably, the reflectivities of the first, second, and third reflective polarization maintaining fiber bragg gratings are all R, where 0< R < 1.
Preferably, the pump source is one of a semiconductor laser, a solid laser, a gas laser, a fiber laser, and a raman laser, and the range of the center wavelength of the output pump light is: and lambda is more than or equal to 700nm and less than or equal to 2000nm, and the pumping mode is one of fiber core single-end pumping, fiber core double-end pumping, cladding single-end pumping and cladding double-end pumping.
Preferably, the first polarization maintaining gain fiber and the second polarization maintaining gain fiber are polarization maintaining fibers or photonic crystal polarization maintaining fibers doped with rare earth elements, and the doped rare earth elements are one or more of ytterbium (Yb), erbium (Er), holmium (Ho), thulium (Tm), neodymium (Nd), chromium (Cr), samarium (Sm) and bismuth (Bi).
The utility model discloses full fiber pulse double-cavity laser of linear polarization output has following advantage:
1. the utility model discloses utilize rare earth element doped's optic fibre as gain medium and saturable absorber, do not need external additional modulation source, full optical fiber design, simple structure, low cost.
2. The utility model discloses utilize the cross modulation effect of resonant cavity, for traditional Q laser instrument of transferring, have higher output and system stability.
3. The utility model discloses combine novel polarization maintaining output structure, reduce the intracavity loss, the system is simple, anti environmental disturbance can the reinforce, easily realizes stabilizing high-efficient linear polarization laser output.
4. The utility model relates to a simply, compact structure can export the ultrashort pulse laser that stability is high, pulse energy is big simultaneously, easily realizes the industrialization.
Description of the drawings:
FIG. 1 is a basic schematic diagram of an all-fiber pulsed dual-cavity laser with linearly polarized output according to embodiment 1;
FIG. 2 is a basic schematic diagram of an all-fiber pulsed dual-cavity laser with linearly polarized output according to embodiment 2;
fig. 3 is a basic schematic diagram of an all-fiber pulsed laser dual-cavity with linearly polarized output according to example 3.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the utility model provides a full fiber pulse dual-cavity laser of linear polarization output, it is linear type dual-resonant cavity modulation structure, and it includes: the polarization maintaining fiber bragg grating; wherein,
the pumping source 1 is connected with the pumping input end of the polarization maintaining optical fiber beam combiner 2; the signal end of the polarization maintaining optical fiber beam combiner 2 is connected with one end of a first reflection type polarization maintaining optical fiber grating Bragg grating 5; the other end of the first reflection type polarization maintaining fiber Bragg grating 5 is connected with one end of the first polarization maintaining gain fiber 3; the other end of the first polarization-preserving gain fiber 3 is connected with one end of a second reflection type polarization-preserving fiber Bragg grating 6; the second reflection type polarization maintaining fiber Bragg grating 6 is orthogonally welded with the first reflection type polarization maintaining fiber Bragg grating 5, so that the reflection peaks of one pair of fast and slow axes are overlapped, and the reflection peaks of the other pair of fast and slow axes are staggered, and only one polarization mode is ensured to oscillate; the other end of the second reflection type polarization-maintaining fiber Bragg grating 6 is connected with one end of a third reflection type polarization-maintaining fiber Bragg grating 7; the common end of the polarization-maintaining optical fiber combiner 2 is connected with one end of a second polarization-maintaining gain optical fiber 4; the other end of the second polarization-maintaining gain fiber 4 is connected with one end of a fourth reflection-type polarization-maintaining fiber Bragg grating 8;
the third reflection type polarization maintaining fiber Bragg grating 7 and the fourth reflection type polarization maintaining fiber Bragg grating 8 form a first resonant cavity; the first reflection type polarization maintaining fiber Bragg grating 5 and the second reflection type polarization maintaining fiber Bragg grating 6 form a second resonant cavity; the pumping light generated by the pumping source 1 enters the first resonant cavity through the pumping input end of the polarization maintaining optical fiber combiner 2, the second polarization maintaining gain optical fiber 4 is pumped, the formed laser enters the second resonant cavity through the polarization maintaining optical fiber combiner 2 and the first reflection type polarization maintaining optical fiber Bragg grating 5, the first polarization maintaining gain optical fiber 3 is pumped to generate laser with another wavelength, and the laser with another wavelength generated by the second resonant cavity is sequentially output through the polarization maintaining optical fiber combiner 2, the second polarization maintaining gain optical fiber 4 and the fourth reflection type polarization maintaining optical fiber Bragg grating 8.
Preferably, the reflectivities of the first, second, third and fourth reflective polarization maintaining fiber bragg gratings 5, 6, 7 and 8 are all R, where 0< R < 1.
Preferably, the pump source 1 is one of a semiconductor laser, a solid laser, a gas laser, a fiber laser, and a raman laser, and the range of the central wavelength of the output pump light is: and lambda is more than or equal to 700nm and less than or equal to 2000nm, and the pumping mode is one of fiber core single-end pumping, fiber core double-end pumping, cladding single-end pumping and cladding double-end pumping.
Preferably, the polarization maintaining fiber combiner 2 is a (2+1) x1 polarization maintaining fiber combiner or a (6+1) polarization maintaining fiber combiner.
Preferably, the first polarization maintaining gain fiber 3 and the second polarization maintaining gain fiber 4 are polarization maintaining fibers or photonic crystal polarization maintaining fibers doped with rare earth elements, and the doped rare earth elements are one or more of ytterbium (Yb), erbium (Er), holmium (Ho), thulium (Tm), neodymium (Nd), chromium (Cr), samarium (Sm) and bismuth (Bi).
Preferably, the first polarization maintaining gain fiber 3 and the second polarization maintaining gain fiber 4 are all panda type polarization maintaining gain fibers, have low attenuation characteristics and excellent birefringence performance, and can keep the polarization state of polarized light unchanged when the polarized light is transmitted in the fibers.
As shown in fig. 3, the utility model also provides a full fiber pulse dual cavity laser of linear polarization output, it is the annular dual cavity modulation structure, include: the polarization maintaining fiber laser comprises a pumping source 1, a polarization maintaining fiber wavelength division multiplexer 9, a first polarization maintaining gain fiber 3, a second polarization maintaining gain fiber 4, a first reflection type polarization maintaining fiber Bragg grating 5, a second reflection type polarization maintaining fiber Bragg grating 6, a third reflection type polarization maintaining fiber Bragg grating 7 and a polarization maintaining fiber circulator 10; wherein,
the pumping source 1 is connected with the pumping input end of a polarization-maintaining optical fiber wavelength division multiplexer 9, the common end of the polarization-maintaining optical fiber wavelength division multiplexer 9 is connected with one end of a second polarization-maintaining gain optical fiber 4, the other end of the second polarization-maintaining gain optical fiber 4 is connected with the incident end of a polarization-maintaining optical fiber circulator 10, the emergent end of the polarization-maintaining optical fiber circulator 10 is connected with one end of a first reflection type polarization-maintaining optical fiber Bragg grating 5, the other end of the first reflection type polarization-maintaining optical fiber Bragg grating 5 is connected with one end of a first polarization-maintaining gain optical fiber 3, and the other end of the first polarization-maintaining gain optical fiber 3 is connected with one end of a second reflection type polarization-maintaining optical fiber Bragg grating 6; the second reflection type polarization maintaining fiber Bragg grating 6 is orthogonally welded with the first reflection type polarization maintaining fiber Bragg grating 5, so that the reflection peaks of one pair of fast and slow axes are overlapped, and the reflection peaks of the other pair of fast and slow axes are staggered, and only one polarization mode is ensured to oscillate; the other end of the second reflection type polarization maintaining fiber Bragg grating 6 is connected with a signal end of the polarization maintaining fiber wavelength division multiplexer 9; the common end of the polarization-maintaining optical fiber circulator 10 is connected with a third reflection-type polarization-maintaining optical fiber Bragg grating 7;
the pumping light of the pumping source 1 enters the second polarization maintaining gain fiber 4 through the pumping input end of the polarization maintaining fiber wavelength division multiplexer 9, then enters from the incident end of the polarization maintaining fiber circulator 10, is output from the common end of the polarization maintaining fiber circulator to the third reflection type polarization maintaining fiber Bragg grating 7, the third reflection type polarization maintaining fiber Bragg grating 7 is a high-reflection type grating, the third reflection type polarization maintaining fiber Bragg grating 7 reflects the light back, enters from the common end of the polarization maintaining fiber circulator 10, is output from the emergent end of the polarization maintaining fiber circulator 10, passes through the first reflection type polarization maintaining fiber Bragg grating 5, the first polarization maintaining gain fiber 3 and the second reflection type polarization maintaining fiber Bragg grating 6, and enters the signal end of the polarization maintaining fiber wavelength division multiplexer to return to form an annular cavity; a second resonant cavity is formed by the first reflection type polarization maintaining fiber Bragg grating 5 and the second reflection type polarization maintaining fiber Bragg grating 6; the pumping light is pumped by the polarization maintaining fiber wavelength division multiplexer 9 to the second polarization maintaining gain fiber 4 in the annular cavity, the generated laser enters the second resonant cavity, the first polarization maintaining gain fiber 3 is pumped, the laser with the other wavelength is output, and the laser sequentially passes through the polarization maintaining fiber wavelength division multiplexer 9, the second polarization maintaining gain fiber 4, the polarization maintaining fiber circulator 10 and the third reflection type polarization maintaining fiber Bragg grating 7 to be output out of the cavity.
Preferably, the reflectivities of the first reflective polarization maintaining fiber bragg grating 5, the second reflective polarization maintaining fiber bragg grating 6 and the third reflective polarization maintaining fiber bragg grating 7 are all R, wherein 0< R < 1.
Preferably, the pump source 1 is one of a semiconductor laser, a solid laser, a gas laser, a fiber laser, and a raman laser, and the range of the central wavelength of the output pump light is: and lambda is more than or equal to 700nm and less than or equal to 2000nm, and the pumping mode is one of fiber core single-end pumping, fiber core double-end pumping, cladding single-end pumping and cladding double-end pumping.
Preferably, the first polarization maintaining gain fiber 3 and the second polarization maintaining gain fiber 4 are polarization maintaining fibers or photonic crystal polarization maintaining fibers doped with rare earth elements, and the doped rare earth elements are one or more of ytterbium (Yb), erbium (Er), holmium (Ho), thulium (Tm), neodymium (Nd), chromium (Cr), samarium (Sm) and bismuth (Bi).
Preferably, the first polarization maintaining gain fiber 3 and the second polarization maintaining gain fiber 4 are all panda type polarization maintaining gain fibers, which have low attenuation characteristics and excellent birefringence performance, and can keep the polarization state of polarized light unchanged when the polarized light is transmitted in the fibers.
The utility model discloses an all-fiber pulse double-cavity laser of linear polarization output, including pumping source, polarization maintaining optical fiber beam combiner, first polarization maintaining gain fiber, second polarization maintaining gain fiber, first, second, third, fourth reflection-type polarization maintaining fiber bragg grating, or including pumping source, polarization maintaining optical fiber wavelength division multiplexer, first polarization maintaining gain fiber, second polarization maintaining gain fiber, first reflection-type polarization maintaining fiber bragg grating, second reflection-type polarization maintaining fiber bragg grating, third reflection-type polarization maintaining fiber bragg grating, polarization maintaining fiber circulator. The utility model discloses a cross modulation effect structural design of two resonant cavities utilizes doping optic fibre as gain medium and saturable absorber, combines novel polarization technique to realize the full optical fiber of polarization maintaining laser instrument, and the design is simple, and compact structure can realize stabilizing efficient linear polarization pulse laser output.
Example 1
An all-fiber pulse dual-cavity laser structure with linear polarization output is shown in fig. 1. In the figure, 1 is a pumping source, and a semiconductor laser diode with a central wavelength of 976nm can be selected; the 2 is a polarization maintaining fiber combiner, which can be a (2+1) × 1 pump signal combiner, such as 6/125 type or 20/125 type; 3. 4 is a first polarization maintaining gain fiber and a second polarization maintaining gain fiber, and a high-performance ytterbium-doped polarization maintaining fiber produced by Nufern company in America can be selected; 5. 6, 7 and 8 are first, second, third and fourth reflection type polarization maintaining fiber Bragg gratings, high-reflection type and partial reflection type gratings can be selected, and the reflectivity is R, wherein 0< R < 1.
The pumping source 1 is connected with the pumping input end of the polarization maintaining optical fiber beam combiner 2; the signal end of the polarization maintaining optical fiber beam combiner 2 is connected with one end of a first reflection type polarization maintaining optical fiber grating Bragg grating 5; the other end of the first reflection type polarization maintaining fiber Bragg grating 5 is connected with one end of the first polarization maintaining gain fiber 3; the other end of the first polarization-preserving gain fiber 3 is connected with one end of a second reflection type polarization-preserving fiber Bragg grating 6; the second reflection type polarization-maintaining fiber Bragg grating 6 is orthogonally welded with the first reflection type polarization-maintaining fiber Bragg grating 5, so that the reflection peaks of one pair of fast and slow axes are overlapped, and the reflection peaks of the other pair of fast and slow axes are staggered, and only one polarization mode is ensured to oscillate. The other end of the second reflection type polarization maintaining fiber Bragg grating 6 is connected with one end of the third reflection type polarization maintaining fiber Bragg grating 7. The common end of the polarization maintaining optical fiber combiner 2 is sequentially connected with a second polarization maintaining gain optical fiber 4 and a fourth reflection type polarization maintaining optical fiber Bragg grating 8.
Pumping light generated by a pumping source 1 enters a first resonant cavity formed by a third reflection type polarization maintaining fiber Bragg grating 7 and a fourth reflection type polarization maintaining fiber Bragg grating 8 through a pumping input end of a polarization maintaining fiber combiner 2, the second polarization maintaining gain fiber 4 is pumped to form laser oscillation, the fourth reflection type polarization maintaining fiber Bragg grating 8 is a high-reflection type grating, namely the reflectivity R is more than or equal to 99%, almost all light at the central wavelength can be reflected back, laser formed by the first resonant cavity enters a second resonant cavity formed by the first reflection type polarization maintaining fiber Bragg grating 5 and the second reflection type polarization maintaining fiber Bragg grating 6 through the polarization maintaining fiber combiner 2, the first polarization maintaining gain fiber 3 is pumped to generate laser with another wavelength, and the laser with the other wavelength generated by the second resonant cavity sequentially passes through the polarization maintaining fiber combiner 2, the second resonant cavity, And the second polarization-maintaining gain fiber 4 and the fourth reflection-type polarization-maintaining fiber Bragg grating 8.
Example 2
An all-fiber pulse dual-cavity laser structure with linear polarization output is shown in fig. 2. In the figure, 1 is a pumping source, and a semiconductor laser diode with a central wavelength of 976nm can be selected; the 2 is a polarization maintaining fiber combiner, which can be a (2+1) × 1 pump signal combiner, such as 6/125 type or 20/125 type; 3. 4 is a first polarization maintaining gain fiber and a second polarization maintaining gain fiber, and a high-performance ytterbium-doped polarization maintaining fiber produced by Nufern company in America can be selected; 5. 6, 7 and 8 are first, second, third and fourth reflection type polarization maintaining fiber Bragg gratings, high-reflection type and partial reflection type gratings can be selected, and the reflectivity is R, wherein 0< R < 1.
The pumping source 1 is connected with the pumping input end of the polarization maintaining optical fiber beam combiner 2; the signal end of the polarization maintaining optical fiber beam combiner 2 is connected with one end of a first reflection type polarization maintaining optical fiber grating Bragg grating 5; the other end of the first reflection type polarization maintaining fiber Bragg grating 5 is connected with one end of the first polarization maintaining gain fiber 3; the other end of the first polarization-preserving gain fiber 3 is connected with one end of a third reflection type polarization-preserving fiber Bragg grating 7, the other end of the third reflection type polarization-preserving fiber Bragg grating 7 is connected with one end of a second reflection type polarization-preserving fiber Bragg grating 6, the second reflection type polarization-preserving fiber Bragg grating 6 is orthogonally welded with the first reflection type polarization-preserving fiber Bragg grating 5, so that the reflection peaks of one pair of fast and slow axes are overlapped, and the reflection peaks of the other pair of fast and slow axes are staggered, and only one polarization mode is ensured to oscillate; the common end of the polarization maintaining optical fiber combiner 2 is sequentially connected with a second polarization maintaining gain optical fiber 4 and a fourth reflection type polarization maintaining optical fiber Bragg grating 8.
Pumping light enters a first resonant cavity formed by a third reflection type polarization maintaining fiber Bragg grating 7 and a fourth reflection type polarization maintaining fiber Bragg grating 8 through a pumping input end of a polarization maintaining fiber combiner 2, the second polarization maintaining gain fiber 4 is pumped to form laser oscillation, the fourth reflection type polarization maintaining fiber Bragg grating 8 is a high-reflection type grating, namely the reflectivity R is more than or equal to 99%, almost all light at the central wavelength can be reflected back, laser formed by the first resonant cavity enters a second resonant cavity formed by the first reflection type polarization maintaining fiber Bragg grating 5 and the second reflection type polarization maintaining fiber Bragg grating 6 through the polarization maintaining fiber combiner 2 to pump the first polarization maintaining gain fiber 3 to generate laser with another wavelength, and the laser with the other wavelength generated by the second resonant cavity sequentially passes through the polarization maintaining fiber combiner 2, the second polarization maintaining gain fiber 4, the third polarization maintaining fiber Bragg grating 8, And the fourth reflection type polarization maintaining fiber Bragg grating 8 outputs.
Example 3
An all-fiber pulse dual-cavity laser structure with linear polarization output is shown in fig. 3. In the figure, 1 is a pumping source, and a semiconductor laser diode with a central wavelength of 976nm can be selected; 9 is a polarization maintaining optical fiber wavelength division multiplexer, which can be an 980/1060nm single-mode wavelength division multiplexer, and has the same function as the polarization maintaining optical fiber beam combiner 2, namely, pump light is coupled into the resonant cavity; 3. 4 is a first polarization maintaining gain fiber and a second polarization maintaining gain fiber, and a high-performance ytterbium-doped polarization maintaining fiber produced by Nufern company in America can be selected; 5. 6, 7 are first, second and third reflection type polarization maintaining fiber Bragg gratings, high-inversion and low-inversion gratings can be selected, the reflectivity is R, wherein 0< R < 1; reference numeral 10 denotes a polarization maintaining fiber circulator for forming a first resonant cavity.
The pumping source 1 is connected with the pumping input end of a polarization-maintaining optical fiber wavelength division multiplexer 9, the common end of the polarization-maintaining optical fiber wavelength division multiplexer 9 is connected with one end of a second polarization-maintaining gain optical fiber 4, the other end of the second polarization-maintaining gain optical fiber 4 is connected with the incident end of a polarization-maintaining optical fiber circulator 10, the emergent end of the polarization-maintaining optical fiber circulator 10 is connected with one end of a first reflection type polarization-maintaining optical fiber Bragg grating 5, the other end of the first reflection type polarization-maintaining optical fiber Bragg grating 5 is connected with one end of a first polarization-maintaining gain optical fiber 3, and the other end of the first polarization-maintaining gain optical fiber 3 is connected with one end of a second reflection type polarization-maintaining optical fiber Bragg grating 6; the second reflection type polarization maintaining fiber Bragg grating 6 is orthogonally welded with the first reflection type polarization maintaining fiber Bragg grating 5, so that the reflection peaks of one pair of fast and slow axes are overlapped, and the reflection peaks of the other pair of fast and slow axes are staggered, and only one polarization mode is ensured to oscillate; the other end of the second reflection type polarization maintaining fiber Bragg grating 6 is connected with a signal end of the polarization maintaining fiber wavelength division multiplexer 9; the common end of the polarization-maintaining fiber circulator 10 is connected with a third reflection-type polarization-maintaining fiber Bragg grating 7.
The pumping light generated by the pumping source 1 enters the second polarization maintaining gain fiber 4 through the pumping input end of the polarization maintaining fiber wavelength division multiplexer 9, then enters from the incident end of the polarization maintaining fiber circulator 10, is output from the common end of the polarization maintaining fiber circulator to the third reflection type polarization maintaining fiber Bragg grating 7, the third reflection type polarization maintaining fiber Bragg grating 7 is of a high inversion type, namely the reflectivity R is more than or equal to 99 percent, almost all the light can be reflected back, enters from the common end of the polarization maintaining fiber circulator, is output from the emergent end of the polarization maintaining fiber circulator, passes through the first reflection type polarization maintaining fiber Bragg grating 5, the first polarization maintaining gain fiber 3 and the second reflection type polarization maintaining fiber Bragg grating 6, enters the signal end of the polarization maintaining fiber wavelength division multiplexer and returns to form an annular cavity, wherein the second reflection type polarization maintaining fiber Bragg grating 6 is in orthogonal fusion connection with the first reflection type polarization maintaining fiber Bragg grating 5, the reflection peaks of one pair of fast and slow axes are overlapped, and the reflection peaks of the other pair of fast and slow axes are staggered, so that only one polarization mode is ensured to oscillate.
The pumping light passes through the second polarization maintaining gain fiber 4 in the pumping annular cavity of the polarization maintaining fiber wavelength division multiplexer 9, the generated laser enters into a second resonant cavity formed by the first reflection type polarization maintaining fiber Bragg grating 5 and the second reflection type polarization maintaining fiber Bragg grating 6, the first polarization maintaining gain fiber 3 is pumped, the laser with the other wavelength is output out of the cavity through the polarization maintaining fiber wavelength division multiplexer 9, the second polarization maintaining gain fiber 4, the polarization maintaining fiber circulator 10 and the third reflection type polarization maintaining fiber Bragg grating 7 in sequence.
The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the protection scope of the present invention is defined by the claims. Various modifications and equivalents of the invention can be made by those skilled in the art within the spirit and scope of the invention, and such modifications and equivalents should also be considered as falling within the scope of the invention.
Claims (9)
1. An all-fiber pulse dual-cavity laser with linearly polarized output, comprising: the polarization maintaining fiber bragg grating polarization maintaining fiber; wherein,
the pumping source (1) is connected with the pumping input end of the polarization maintaining optical fiber beam combiner (2); the signal end of the polarization-maintaining optical fiber combiner (2) is connected with one end of a first reflection-type polarization-maintaining optical fiber grating Bragg grating (5); the other end of the first reflection type polarization maintaining fiber Bragg grating (5) is connected with one end of the first polarization maintaining gain fiber (3); the other end of the first polarization-preserving gain fiber (3) is connected with one end of a second reflection type polarization-preserving fiber Bragg grating (6); the second reflection type polarization-maintaining fiber Bragg grating (6) is orthogonally welded with the first reflection type polarization-maintaining fiber Bragg grating (5), so that the reflection peaks of one pair of fast and slow axes are overlapped, and the reflection peaks of the other pair of fast and slow axes are staggered, and only one polarization mode is ensured to oscillate; the other end of the second reflection type polarization-maintaining fiber Bragg grating (6) is connected with one end of a third reflection type polarization-maintaining fiber Bragg grating (7); the common end of the polarization-maintaining optical fiber combiner (2) is connected with one end of a second polarization-maintaining gain optical fiber (4); the other end of the second polarization-maintaining gain fiber (4) is connected with one end of a fourth reflection-type polarization-maintaining fiber Bragg grating (8);
the third reflection type polarization-maintaining fiber Bragg grating (7) and the fourth reflection type polarization-maintaining fiber Bragg grating (8) form a first resonant cavity; the first reflection type polarization-maintaining fiber Bragg grating (5) and the second reflection type polarization-maintaining fiber Bragg grating (6) form a second resonant cavity; pump light generated by a pumping source (1) enters a first resonant cavity through a pumping input end of a polarization maintaining optical fiber beam combiner (2), a second polarization maintaining gain optical fiber (4) is pumped, formed laser enters a second resonant cavity through the polarization maintaining optical fiber beam combiner (2) and a first reflection type polarization maintaining optical fiber Bragg grating (5), the first polarization maintaining gain optical fiber (3) is pumped to generate laser with another wavelength, and the laser with the other wavelength generated by the second resonant cavity is sequentially output through the polarization maintaining optical fiber beam combiner (2), the second polarization maintaining gain optical fiber (4) and a fourth reflection type polarization maintaining optical fiber Bragg grating (8).
2. The all-fiber pulsed dual-cavity laser with linearly polarized output according to claim 1, wherein the reflectivities of the first reflective polarization-maintaining fiber bragg grating (5), the second reflective polarization-maintaining fiber bragg grating (6), the third reflective polarization-maintaining fiber bragg grating (7) and the fourth reflective polarization-maintaining fiber bragg grating (8) are all R, wherein 0< R < 1.
3. The all-fiber pulse dual-cavity laser with linear polarization output according to claim 1, wherein the pump source (1) is one of a semiconductor laser, a solid laser, a gas laser, a fiber laser and a raman laser, and the range of the central wavelength of the output pump light is as follows: and lambda is more than or equal to 700nm and less than or equal to 2000nm, and the pumping mode is one of fiber core single-end pumping, fiber core double-end pumping, cladding single-end pumping and cladding double-end pumping.
4. The all-fiber pulsed dual-cavity laser with linearly polarized output according to claim 1, wherein the polarization-maintaining fiber combiner (2) is a (2+1) x1 polarization-maintaining fiber combiner or a (6+1) polarization-maintaining fiber combiner.
5. The all-fiber pulse dual-cavity laser with linear polarization output of claim 1, wherein the first polarization maintaining gain fiber (3) and the second polarization maintaining gain fiber (4) are polarization maintaining fibers or photonic crystal polarization maintaining fibers doped with rare earth elements, and the doped rare earth elements are one or more of ytterbium (Yb), erbium (Er), holmium (Ho), thulium (Tm), neodymium (Nd), chromium (Cr), samarium (Sm) and bismuth (Bi).
6. An all-fiber pulse dual-cavity laser with linearly polarized output, comprising: the polarization maintaining fiber laser comprises a pumping source (1), a polarization maintaining fiber wavelength division multiplexer (9), a first polarization maintaining gain fiber (3), a second polarization maintaining gain fiber (4), a first reflection type polarization maintaining fiber Bragg grating (5), a second reflection type polarization maintaining fiber Bragg grating (6), a third reflection type polarization maintaining fiber Bragg grating (7) and a polarization maintaining fiber circulator (10); wherein,
the pump source (1) is connected with the pump input end of a polarization-maintaining fiber wavelength division multiplexer (9), the common end of the polarization-maintaining fiber wavelength division multiplexer (9) is connected with one end of a second polarization-maintaining gain fiber (4), the other end of the second polarization-maintaining gain fiber (4) is connected with the incident end of a polarization-maintaining fiber circulator (10), the emergent end of the polarization-maintaining fiber circulator (10) is connected with one end of a first reflection type polarization-maintaining fiber Bragg grating (5), the other end of the first reflection type polarization-maintaining fiber Bragg grating (5) is connected with one end of a first polarization-maintaining gain fiber (3), and the other end of the first polarization-maintaining gain fiber (3) is connected with one end of a second reflection type polarization-maintaining fiber Bragg grating (6); the second reflection type polarization-maintaining fiber Bragg grating (6) is orthogonally welded with the first reflection type polarization-maintaining fiber Bragg grating (5), so that the reflection peaks of one pair of fast and slow axes are overlapped, and the reflection peaks of the other pair of fast and slow axes are staggered, and only one polarization mode is ensured to oscillate; the other end of the second reflection type polarization maintaining fiber Bragg grating (6) is connected with a signal end of the polarization maintaining fiber wavelength division multiplexer (9); the common end of the polarization-maintaining optical fiber circulator (10) is connected with a third reflection-type polarization-maintaining optical fiber Bragg grating (7);
the pump light generated by the pump source (1) enters the second polarization-maintaining gain fiber (4) through the pump input end of the polarization-maintaining fiber wavelength division multiplexer (9), then enters from the incident end of the polarization-maintaining fiber circulator (10), and is output from the common end of the polarization-maintaining fiber circulator to reach the third reflection-type polarization-maintaining fiber Bragg grating (7), the third reflection-type polarization-maintaining fiber Bragg grating (7) is a high-reflection-type grating, the third reflection-type polarization-maintaining fiber Bragg grating (7) reflects the light back, enters from the common end of the polarization-maintaining fiber circulator (10), is output from the emergent end of the polarization-maintaining fiber circulator (10), passes through the first reflection-type polarization-maintaining fiber Bragg grating (5), the first polarization-maintaining gain fiber (3) and the second polarization-maintaining fiber Bragg grating (6), and enters the signal end of the polarization-maintaining fiber wavelength division multiplexer to return to form the reflection-type polarization-maintaining fiber Bragg grating; a second resonant cavity is formed by a first reflection type polarization-maintaining fiber Bragg grating (5) and a second reflection type polarization-maintaining fiber Bragg grating (6); the pump light passes through a second polarization maintaining gain fiber (4) in the pumping annular cavity of the polarization maintaining fiber wavelength division multiplexer (9), the generated laser enters the second resonant cavity, the first polarization maintaining gain fiber (3) is pumped, the laser of the other wavelength is output, and the laser sequentially passes through the polarization maintaining fiber wavelength division multiplexer (9), the second polarization maintaining gain fiber (4), the polarization maintaining fiber circulator (10) and the third reflection type polarization maintaining fiber Bragg grating (7) to be output out of the cavity.
7. The all-fiber pulsed dual-cavity laser with linearly polarized output according to claim 6, wherein the reflectivities of the first reflective polarization-maintaining fiber Bragg grating (5), the second reflective polarization-maintaining fiber Bragg grating (6) and the third reflective polarization-maintaining fiber Bragg grating (7) are all R, wherein 0< R < 1.
8. The all-fiber pulse dual-cavity laser with linear polarization output according to claim 6, wherein the pump source (1) is one of a semiconductor laser, a solid laser, a gas laser, a fiber laser and a Raman laser, and the range of the central wavelength of the output pump light is as follows: and lambda is more than or equal to 700nm and less than or equal to 2000nm, and the pumping mode is one of fiber core single-end pumping, fiber core double-end pumping, cladding single-end pumping and cladding double-end pumping.
9. The all-fiber pulse dual-cavity laser with linear polarization output of claim 6, wherein the first polarization maintaining gain fiber (3) and the second polarization maintaining gain fiber (4) are polarization maintaining fibers or photonic crystal polarization maintaining fibers doped with rare earth elements, and the doped rare earth elements are one or more of ytterbium (Yb), erbium (Er), holmium (Ho), thulium (Tm), neodymium (Nd), chromium (Cr), samarium (Sm) and bismuth (Bi).
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| CN106410576A (en) * | 2016-08-28 | 2017-02-15 | 北京工业大学 | Linear polarization output all-fiber pulse dual-cavity lasers |
| CN107946886A (en) * | 2017-12-19 | 2018-04-20 | 北京凯普林光电科技股份有限公司 | A kind of optical fiber laser |
| CN109297662A (en) * | 2018-10-11 | 2019-02-01 | 三峡大学 | A kind of aerial cable vibration testing device and test method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106410576A (en) * | 2016-08-28 | 2017-02-15 | 北京工业大学 | Linear polarization output all-fiber pulse dual-cavity lasers |
| CN107946886A (en) * | 2017-12-19 | 2018-04-20 | 北京凯普林光电科技股份有限公司 | A kind of optical fiber laser |
| CN109297662A (en) * | 2018-10-11 | 2019-02-01 | 三峡大学 | A kind of aerial cable vibration testing device and test method |
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