CN113937601A - Single polarization state and single longitudinal mode optical fiber laser - Google Patents
Single polarization state and single longitudinal mode optical fiber laser Download PDFInfo
- Publication number
- CN113937601A CN113937601A CN202111075904.7A CN202111075904A CN113937601A CN 113937601 A CN113937601 A CN 113937601A CN 202111075904 A CN202111075904 A CN 202111075904A CN 113937601 A CN113937601 A CN 113937601A
- Authority
- CN
- China
- Prior art keywords
- laser
- output
- phase shift
- shift grating
- wavelength
- 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.)
- Pending
Links
- 230000010287 polarization Effects 0.000 title claims abstract description 56
- 239000013307 optical fiber Substances 0.000 title description 19
- 230000010363 phase shift Effects 0.000 claims abstract description 56
- 230000003287 optical effect Effects 0.000 claims abstract description 51
- 239000000835 fiber Substances 0.000 claims abstract description 37
- 238000005086 pumping Methods 0.000 claims abstract description 26
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 16
- 150000002910 rare earth metals Chemical class 0.000 claims description 14
- 230000010355 oscillation Effects 0.000 claims description 6
- 239000004065 semiconductor Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims 2
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 238000004806 packaging method and process Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000001427 coherent effect Effects 0.000 abstract description 2
- 238000004891 communication Methods 0.000 abstract description 2
- 230000005855 radiation Effects 0.000 description 6
- 230000004927 fusion Effects 0.000 description 5
- 230000008033 biological extinction Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000000137 annealing Methods 0.000 description 2
- 230000035559 beat frequency Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- -1 rare earth ions Chemical class 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000000411 transmission spectrum Methods 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- KWMNWMQPPKKDII-UHFFFAOYSA-N erbium ytterbium Chemical compound [Er].[Yb] KWMNWMQPPKKDII-UHFFFAOYSA-N 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000007500 overflow downdraw method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000005365 phosphate glass Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06712—Polarising fibre; Polariser
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094003—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
- H01S3/094019—Side pumped fibre, whereby pump light is coupled laterally into the fibre via an optical component like a prism, or a grating, or via V-groove coupling
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094065—Single-mode pumping
Abstract
The invention discloses a single polarization state and single longitudinal mode fiber laser, and belongs to the field of fiber lasers. The laser includes: a pumping light source, a wavelength division multiplexer, a 45-degree inclined phase shift grating and an optical isolator. The laser can realize stable single polarization state and single longitudinal mode output based on the single longitudinal mode selection characteristic of the 45-degree inclined phase shift grating and the selective transmission effect on p-polarized light. The invention is suitable for the fields of seismic wave sensing, interferometric sensors, laser radars, coherent communication and the like, and has the characteristics of simple and compact structure, easy packaging, stable performance, low manufacturing cost and the like.
Description
Technical Field
The invention belongs to the technical field of fiber lasers, and particularly relates to a single polarization state and single longitudinal mode fiber laser.
Background
The distributed feedback fiber laser is a novel fiber laser developed in recent years, utilizes the phase shift grating as a wavelength selection element, has the advantages of simple and compact structure, narrow line width, low noise, electromagnetic interference resistance, easy large-scale array multiplexing and the like, is widely applied in the fields of seismic wave sensing, interferometric sensors, laser radars, coherent communication and the like, and is an important branch of the fiber laser.
The laser mainly comprises a pumping source, a gain medium and a resonant cavity. The resonant cavity of the distributed feedback fiber laser consists of a phase shift grating and is used for forming laser oscillation. The phase shift grating used by the traditional distributed feedback fiber laser has irrelevant polarization, so the output laser has two orthogonal polarization states, single polarization state output cannot be obtained if a polarization control element is not used, the phase noise of a beat frequency signal of the orthogonal polarization state laser is far higher than the background thermal noise of the laser, the line width broadening and the phase noise of the laser are increased, the performance of the laser is seriously influenced, and the single polarization state laser output obtained by using the polarization control element has the problems of larger insertion loss, difficult integration and packaging, higher cost and the like.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a single polarization state and single longitudinal mode fiber laser, and aims to solve the problems of high insertion loss, difficulty in integration and packaging and high cost of the conventional single polarization state laser output.
In order to achieve the above object, the present invention provides a single polarization state, single longitudinal mode fiber laser, comprising: the device comprises a pumping light source, a wavelength division multiplexer, a 45-degree inclined phase shift grating and an optical isolator; the output end of the pumping light source is connected with the first input end of the wavelength division multiplexer, the output end of the wavelength division multiplexer is connected with one end of the 45-degree inclined phase-shift grating through a first fusion joint, and the other end of the 45-degree inclined phase-shift grating is connected with the input end of the optical isolator through a second fusion joint;
the pumping light source is used for providing pumping light; the 45-degree inclined phase shift grating is used as a resonant cavity to enable laser to form oscillation to inhibit other longitudinal modes under the second-order Bragg reflection central wavelength, so that single longitudinal mode output is realized; the output laser is divided into a first output laser and a second output laser in two opposite directions;
the wavelength division multiplexer is used for separating the pump light and the second output laser returned to the wavelength division multiplexer;
the optical isolator is used for controlling unidirectional transmission of the first output laser.
Furthermore, the pump light source can be selected from a semiconductor laser, a fiber laser or a hybrid laser system, which can ensure that the provided pump light output power and the center wavelength meet the generation condition of the output laser of the pumped single polarization state and single longitudinal mode fiber laser; if it is desired to produce a single polarization state laser output in the 1550nm band, the pump light source may employ a semiconductor laser, fiber laser, or hybrid laser system having a center wavelength of 976nm or 915 nm.
Furthermore, the 45-degree inclined phase shift grating comprises a rare earth doped optical waveguide, such as a non-polarization-maintaining rare earth doped quartz glass optical fiber, a non-polarization-maintaining rare earth doped phosphate glass optical fiber and the like, the second-order Bragg reflection wavelength of the grating is matched with the central wavelength of preset output laser, the conditions of generating single polarization state and single longitudinal mode output laser of a required waveband are met, and meanwhile, the polarization-related extinction ratio of the grating in the waveband is close to the peak value and the grating has good polarization selection characteristics; if it is expected to generate a single polarization state, single longitudinal mode laser output in the 1550nm band, the second order bragg reflection center wavelength of the 45 degree tilted phase shift grating should be 1550 nm.
The principle of the single polarization state and single longitudinal mode output fiber laser is as follows:
a45-degree inclined phase shift grating is etched in a non-polarization-maintaining rare earth doped optical waveguide, the period is reversed V, the length is L cm, and a pi phase shift point is positioned at the center of the grating and is used for forming a unique narrow line width transmission window in a 45-degree inclined phase shift grating stop band.
Wherein, the central wavelength lambda of the 45-degree inclined phase shift gratingBThe following relationship is satisfied:
mλB＝2neffΛaxis
wherein m is a positive integer and represents the reflection order of the 45-degree inclined phase shift grating, and neffIs the effective refractive index of the core, ΛaxisIn order to have an axial grating period,
λBthe center wavelength of the 45-degree tilted phase shift grating is within the gain bandwidth of the rare-earth doped optical waveguide used.
Pumping light is injected into the rare earth doped optical waveguide containing the 45-degree inclined phase shift grating, rare earth ions jump to a high energy level after absorbing the pumping light, radiationless jump is carried out to the upper energy level, and finally particle number reversal is formed. The spontaneous radiation light can initiate same-frequency stimulated radiation, rare earth ions are made to jump from an upper laser energy level to a lower laser energy level, light within the 45-degree inclined phase shift grating Bragg wavelength range is continuously reflected in the resonant cavity, and stimulated radiation light amplification is formed. Since the 45 degree tilted phase shift grating opens a transmission window at the center wavelength, the laser loss at this wavelength is minimal. Due to mode competition effect, the laser at the wavelength forms oscillation to inhibit the generation of other longitudinal modes, so that the single longitudinal mode narrow linewidth output is selectively realized at the wavelength.
Because the refractive index change of the grating is extremely small compared with the effective refractive index of the optical waveguide, the Brewster angle of the grating is 45 degrees in the preset output wavelength range of the laser and is equal to the inclination angle of the grating, so that the laser in the s-polarization state is coupled out in the form of a radiation mode when passing through the grating, the loss is large, only the laser in the p-polarization state can form oscillation in the resonant cavity with low loss, and the 45-degree inclined phase-shift grating in the lambda range can be obtained by calculating the phase matching conditionBThe polarization extinction ratio is maximal, and the high polarization extinction ratio can be kept in the working wavelength range of the laser, so that good single polarization state output can be stably realized.
Furthermore, the working wavelength of the wavelength division multiplexer corresponds to the wavelength of the laser output by the single-polarization-state and single-longitudinal-mode output fiber laser respectively; if it is desired to produce a single polarization state, single longitudinal mode laser output in the 1550nm band, while using a 976nm laser pump, an 980/1550nm wavelength division multiplexer should be chosen.
Furthermore, a port of the wavelength division multiplexer, which corresponds to the laser wavelength output of the fiber laser, can also be used as an output port, or a feedback optical path is accessed to provide feedback for the single polarization state and single longitudinal mode output fiber laser; if the port of the wavelength division multiplexer corresponding to the laser wavelength output port of the fiber laser is used as an output port, the port is connected with a non-polarization-maintaining optical isolator, and the laser output by the second end of the optical isolator can be connected to a feedback light path to provide feedback for the single-polarization-state single-longitudinal-mode output fiber laser.
Furthermore, the optical isolator has no relation with polarization, and the working waveband comprises the wavelength range of laser output by the single-polarization-state single-longitudinal-mode output laser; if it is desired to produce a single polarization state, single longitudinal mode laser output in the 1550nm band, an optical isolator with a center wavelength of 1550nm should be chosen.
Further, the 45-degree tilted phase shift grating may be fabricated using ultraviolet light or femtosecond laser writing.
The process for writing the 45-degree inclined phase shift grating by using a phase mask method comprises the following steps:
and 7, after the writing is finished, taking down the optical waveguide, placing the optical waveguide in a constant temperature box for annealing treatment, and if the optical waveguide is an optical fiber, coating a bare fiber area by using an optical fiber coating machine after the annealing treatment is finished.
The process of writing the 45-degree inclined phase shift grating by using the femtosecond laser direct writing technology comprises the following steps:
and 6, starting the femtosecond laser and the writing platform to write the grating, and controlling the femtosecond laser energy to be high enough to realize saturated exposure during writing so as to enhance the second-order Bragg reflection effect of the 45-degree inclined phase-shift grating.
Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. compared with other distributed feedback fiber lasers, the single polarization state and single longitudinal mode output fiber laser can obtain stable single polarization state and single longitudinal mode laser output without an additional polarization control element, the phase shift grating does not have a polarization selection function, so that the output laser has two orthogonal polarization states, and if the single polarization state and single longitudinal mode output is realized, a polarization selection element needs to be introduced, so that the complexity and the manufacturing cost of a system are increased, the miniaturization and the packaging are not facilitated, and the environment influence is possibly caused.
2. The single polarization state and single longitudinal mode output fiber laser obtains single polarization state and single longitudinal mode laser in the resonant cavity, and does not have mode competition and beat frequency noise of orthogonal polarization state laser, so that the single polarization state and single longitudinal mode output fiber laser has narrower line width and better frequency stability.
3. The single polarization state and single longitudinal mode output fiber laser does not need to use a polarization maintaining fiber and a device, the 45-degree inclined phase shift grating can be used as a single longitudinal mode selection element and a polarization control element at the same time, stable narrow-linewidth single polarization state and single longitudinal mode output can be obtained without an additional polarization control element, and the single polarization state and single longitudinal mode output fiber laser is easy to package and low in manufacturing cost.
Drawings
Fig. 1 is a schematic diagram of a single polarization state, single longitudinal mode output fiber laser of the present invention.
Fig. 2 is a schematic diagram of a single polarization state, single longitudinal mode output fiber laser in a second embodiment.
Description of the drawings:
1. the optical fiber laser comprises a pumping light source, 2, a wavelength division multiplexer, 3, a first fusion point, 4 and 45-degree inclined phase shift gratings, 5 and a second fusion point, 6 and an optical isolator, and 7 and 8-degree inclined angle end faces.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. 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 addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
An embodiment of the present invention provides a single polarization state, single longitudinal mode output fiber laser, as shown in fig. 1, including: the device comprises a pumping light source 1, a wavelength division multiplexer 2, a 45-degree inclined phase shift grating 4 and an optical isolator 6; the pump light source 1 with the port connection of wavelength division multiplexer 2's the corresponding pump light source wavelength, wavelength division multiplexer 2's common port is connected through first splice point 3 and 45 degrees slope phase shift grating 4's one end, 45 degrees slope phase shift grating 4's the other end is connected with optical isolator 6's input through second splice point 5, and the pump light that pump light source 1 produced, through wavelength division multiplexer 2 input 45 degrees slope phase shift grating 4's one end, only specific wavelength range and p polarization state's laser loss are less when the laser that the stimulated radiation produced passes through 45 degrees slope phase shift grating 4, are less than the gain in the resonant cavity, can form the oscillation, export from the other end of 45 degrees slope phase shift grating, export through optical isolator 6. The other path is returned to the wavelength division multiplexer 2 and then output.
According to the single-polarization-state single-longitudinal-mode output fiber laser provided by the invention, the pumping light source is connected with the port of the wavelength of the corresponding pumping light source of the wavelength division multiplexer, and can be directly connected, and the output end of the pumping light source can be connected with the port of the wavelength of the corresponding pumping light source of the wavelength division multiplexer through a passive fiber. Specifically, if there are multiple pump light sources, the multiple pump light sources should be combined by a beam combiner, and the output end of the beam combiner is connected to a port of the wavelength division multiplexer corresponding to the pump light source.
According to the single polarization state and single longitudinal mode output fiber laser provided by the invention, the wavelength division multiplexer is a non-polarization-maintaining wavelength division multiplexer, at least 3 ports are provided, and the ports are respectively a public end, a port corresponding to the wavelength of a pump light source and a port corresponding to the wavelength of output laser.
In a specific embodiment, the output end of the optical isolator is further connected with a transmission optical fiber or an optical fiber end cap. The pumping light source, the active optical fiber inscribed with the 45-degree inclined phase shift grating, the transmission optical fiber or the optical fiber end cap are connected together by an optical fiber fusion method.
According to the single polarization state and single longitudinal mode output fiber laser provided by the invention, the 45-degree inclined phase shift grating is engraved on the non-polarization-maintaining rare earth doped optical waveguide, has extremely high polarization extinction ratio within the output wavelength range of the laser, and can obtain narrow linewidth laser output with the polarization degree of more than 99.8%.
In some embodiments, the active optical waveguide is any one of a ytterbium-doped optical waveguide, an erbium-ytterbium co-doped optical waveguide, and a thulium-doped optical waveguide.
As a second specific embodiment, as shown in fig. 2, the optical fiber coupler includes a pump light source 1, a wavelength division multiplexer 2, a 45-degree tilted phase shift grating 4, an optical isolator 6, and a tilted 8-degree end face 7, where the pump light source 1 is connected to a port of the wavelength division multiplexer 2 corresponding to the wavelength of the pump light source, a common end of the wavelength division multiplexer 2 is connected to one end of the 45-degree tilted phase shift grating 4 through a first fusion point 3, and the other end of the 45-degree tilted phase shift grating 4 is the tilted 8-degree end face 7.
In this specific embodiment, the pump light generated by the pump light source 1 is injected into the non-polarization-maintaining rare earth doped optical waveguide where the 45-degree inclined phase shift grating 4 is located through the wavelength division multiplexer 2, and the laser generated by the stimulated radiation generates resonance in the resonant cavity after frequency selection and polarization state control of the 45-degree inclined phase shift grating 4, and is output through the wavelength division multiplexer 2 and the optical isolator 6 in sequence. The other path of laser passes through the end face 7 inclined at an angle of 8 degrees and then is transmitted into the air at the maximum part.
It should be noted that the present invention is illustrated as a 3-port wavelength division multiplexer, and wavelength division multiplexers with other specifications can be selected according to requirements.
Specifically, the center wavelength of the laser output laser light may be 1064nm, 1550nm, 2000 nm.
Specifically, the pumping light source 1 may select a pumping light source with multiple wavelengths, such as a 976nm pumping light source, a 915nm pumping light source, or a 1550nm pumping light source, or a wavelength division multiplexer that combines multiple pumping light sources with the same wavelength or directly connects to a corresponding number of ports to provide pumping light.
Specifically, the working wavelength bands of the port of the wavelength division multiplexer 2, the 45-degree inclined phase shift grating 4 and the optical isolator should include the laser output laser wavelength range, and when the conditions allow, the central wavelength of the port of the wavelength division multiplexer 2, the 45-degree inclined phase shift grating 4 and the optical isolator should be consistent with the central wavelength of the laser output laser.
Specifically, the optical waveguide on which the 45-degree inclined phase shift grating 4 is written may be a rare-earth-doped optical fiber or a rare-earth-doped planar optical waveguide.
In particular, the laser may be placed in a constant temperature seismic isolation package to obtain a more stable output.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A single polarization state, single longitudinal mode fiber laser, comprising: the device comprises a pumping light source (1), a wavelength division multiplexer (2), a 45-degree inclined phase shift grating (4) and an optical isolator (6); the output end of the pumping light source (1) is connected with the first input end of the wavelength division multiplexer (2), the output end of the wavelength division multiplexer (2) is connected with one end of the 45-degree inclined phase shift grating (4) through the first welding point (3), and the other end of the 45-degree inclined phase shift grating (4) is connected with the input end of the optical isolator (6) through the second welding point (5);
the pumping light source (1) is used for providing pumping light; the 45-degree inclined phase shift grating (4) is used as a resonant cavity to enable laser to form oscillation to inhibit other longitudinal modes under the second-order Bragg reflection central wavelength, so that single longitudinal mode output is realized; the laser of output divide into the first output laser and the second output laser of two opposite directions, one-way output is realized through optical isolator (6) to first output laser, the second input that the second output laser passes through wavelength division multiplexer (2) separates with the pump light.
2. The laser according to claim 1, characterized in that the second order bragg reflection center wavelength of the 45 degree tilted phase shift grating (4) matches the target output laser center wavelength.
3. The laser according to claim 2, characterized in that the second order bragg reflection center wavelength λ of the 45 degree tilted phase shift grating (4)BSatisfies the following conditions:
mλB＝2neffΛaxis
wherein m is a positive integer and represents the reflection order of the 45-degree inclined phase shift grating (4), and neffIs the effective refractive index of the core of the 45-degree inclined phase shift grating (4), lambdaaxisIs the axial period of the 45-degree inclined phase-shift grating (4), and the lambda is the period of the 45-degree inclined phase-shift grating (4).
4. The laser according to claim 1, characterized in that the wavelength division multiplexer (2) has an operating wavelength corresponding to the wavelength of the pump light and the output laser light, respectively.
5. A laser as claimed in claim 1, characterised in that the optical isolator (6) has an operating band encompassing the wavelength range of the output laser light.
6. A laser according to claim 3, characterized in that the 45 degree tilted phase shift grating (4) is a rare earth doped optical waveguide.
7. Laser according to claim 1, characterized in that the pump light source (1) is a semiconductor laser, a fiber laser or a hybrid laser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111075904.7A CN113937601A (en) | 2021-09-14 | 2021-09-14 | Single polarization state and single longitudinal mode optical fiber laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111075904.7A CN113937601A (en) | 2021-09-14 | 2021-09-14 | Single polarization state and single longitudinal mode optical fiber laser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113937601A true CN113937601A (en) | 2022-01-14 |
Family
ID=79275706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111075904.7A Pending CN113937601A (en) | 2021-09-14 | 2021-09-14 | Single polarization state and single longitudinal mode optical fiber laser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113937601A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117498132A (en) * | 2023-12-29 | 2024-02-02 | 中国工程物理研究院激光聚变研究中心 | Narrow linewidth fiber laser based on inclined grating |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1822450A (en) * | 2006-03-17 | 2006-08-23 | 中国科学院上海光学精密机械研究所 | Single longitudinal mode single polarizing phase shift distribution feedback optic fiber laser and its producing method |
-
2021
- 2021-09-14 CN CN202111075904.7A patent/CN113937601A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1822450A (en) * | 2006-03-17 | 2006-08-23 | 中国科学院上海光学精密机械研究所 | Single longitudinal mode single polarizing phase shift distribution feedback optic fiber laser and its producing method |
Non-Patent Citations (1)
| Title |
|---|
| 宋青果等: "基于４５°辐射倾斜光纤光栅的全光纤偏振相关器件", 《光学学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117498132A (en) * | 2023-12-29 | 2024-02-02 | 中国工程物理研究院激光聚变研究中心 | Narrow linewidth fiber laser based on inclined grating |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7496244B2 (en) | Method for generating a linear single polarization output beam | |
| US6970494B1 (en) | Rare-earth doped phosphate-glass lasers and associated methods | |
| JP5487213B2 (en) | Highly rare earth doped optical fiber for use in fiber lasers and amplifiers. | |
| US7088756B2 (en) | Polarization maintaining dispersion controlled fiber laser source of ultrashort pulses | |
| CN102388512B (en) | Cascaded raman fiber laser system based on filter fiber | |
| KR101111432B1 (en) | Fiber lasers | |
| WO2020155696A1 (en) | Multi-wavelength single-frequency q-switched optical fiber laser | |
| US20030021302A1 (en) | Raman cascade light sources | |
| US6282016B1 (en) | Polarization maintaining fiber lasers and amplifiers | |
| CN106998030B (en) | Semi-open cavity type linear polarization and ultra-narrow linewidth multi-wavelength random fiber laser | |
| Zhang et al. | Switchable multi-wavelength thulium-doped fiber laser employing a polarization-maintaining sampled fiber Bragg grating | |
| CN100423385C (en) | A linear resonant cavity wide narrow line tunable optical fiber laser | |
| CN100495835C (en) | Separate linetype cavity wavelength interval tunable single polarization dual wavelength optical fibre grating laser | |
| CN113937601A (en) | Single polarization state and single longitudinal mode optical fiber laser | |
| CN109149336A (en) | Passive Q-adjusted mode-locked laser based on SBS and fabry perot interferometer | |
| JP2753539B2 (en) | Optical fiber amplifier | |
| JPH03127032A (en) | Functional optical waveguide medium | |
| US7038844B2 (en) | High power 938 nanometer fiber laser and amplifier | |
| CN112688150B (en) | Dual-wavelength fiber laser based on mode interferometer | |
| JPS63220586A (en) | Nd-doped fiber laser system | |
| CN117438878A (en) | Mode-locked fiber laser and wavelength tunable method thereof | |
| CN117080851A (en) | Laser based on asymmetric saturated absorber and laser single longitudinal mode output method | |
| CN113572002A (en) | Design method for half-wave plate control optical fiber coupling output laser | |
| CN116316014A (en) | Thulium-doped multi-wavelength mode-locked fiber laser based on multimode fiber | |
| Funk et al. | Erbium and ytterbium waveguide lasers in phosphate glass |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220114 |