CN206524516U - A kind of 8 word chamber locked mode post vector optical fiber lasers based on model selection coupler - Google Patents
A kind of 8 word chamber locked mode post vector optical fiber lasers based on model selection coupler Download PDFInfo
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Abstract
The utility model discloses a kind of 8 word chamber locked mode post vector optical fiber lasers based on model selection coupler, including pumping source, wavelength division multiplexer, gain fibre, single-mode fiber, the first Polarization Controller, the second Polarization Controller, three-dB coupler, isolator, coupler and model selection coupler；The output end of pumping source is connected with short wavelength's input of wavelength division multiplexer, the output end of wavelength division multiplexer passes sequentially through gain fibre, single-mode fiber, the first Polarization Controller and is connected with 1 port input of three-dB coupler, 2 port inputs of three-dB coupler are connected with the long wave long port of wavelength division multiplexer, 4 ports of three-dB coupler are connected by isolator, coupler, model selection coupler with 3 ports of three-dB coupler, a 8 word resonators are constituted, the second Polarization Controller is connected to the less fundamental mode optical fibre output end of model selection coupler.The utility model has the advantages that optical fiber laser output pulse is narrow, post vector laser polarization purity is high, it is low that small, cost is lost.
Description
Technical Field
The utility model belongs to the fiber laser field, concretely relates to 8 word chamber mode locking post vector fiber laser based on mode selection coupler.
Background
In recent years, cylindrical vector lasers, especially cylindrical vector lasers with ultra-short pulse width, have received great attention due to their symmetric polarization characteristics and intensity characteristics, and the focusing characteristics of radial polarized light at high numerical apertures, and are widely used in the fields of material processing, optical tweezers, optical fiber sensing, surface plasma excitation, optical fiber communication, and the like.
At present, the column vector laser is mainly obtained by accurately regulating and controlling the light polarization state of a bulk free space device such as a spatial phase modulator, a combined half-wave plate, a birefringent crystal, a sub-wavelength grating and the like. However, the device is used for generating the cylindrical vector laser, strict requirements are imposed on the precision degree and the action range of the device, and the optical path is not easy to integrate and the manufacturing cost is high.
In recent years, excitation of a high-order mode and acquisition of column vector laser by using an all-fiber method become research hotspots, the high-order mode is mainly excited by using a fiber dislocation coupling method, a few-mode fiber grating is used as a transverse high-order mode selection unit, and ultrashort pulse column vector laser is acquired by combining a mode locking technology, for example, the invention patent with the publication number of CN102544999B and the name of 'an all-fiber axisymmetric polarized beam laser based on the few-mode fiber grating and a generation method'. The advantage of exciting the column vector laser by the all-fiber method of the dislocation coupling and few-mode grating is simple structure and easy integration, however, the disadvantage is that: (1) the high-order mode loss generated by the optical fiber dislocation coupling method is large, the column vector laser slope efficiency is low, the output power is small, and the application of the column vector laser slope efficiency in long-distance optical fiber communication and optical fiber sensing systems is limited; (2) when a high-order mode is generated by a dislocation coupling method, few-mode gratings are required to be used for mode selection, and the few-mode gratings are high in preparation technical requirement, long in period, high in price and low in practicability. Therefore, how to realize a low-loss, high-efficiency, all-fiber and low-cost method to obtain an ultrashort pulse column vector laser with high purity, high stability and compact structure is of great significance.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve and overcome that prior art produces ultrashort pulse post vector laser's structure is complicated, the loss is big, the inefficiency and cost of manufacture shortcoming such as expensive, provide a novel method of producing ultrashort pulse post vector laser, 8 word chamber mode locking post vector fiber laser based on the mode selection coupler promptly, all devices of this laser all adopt full fiber coupling mode, compact structure does not receive external factor to disturb, can work in a continuous and stable manner, and this fiber laser loss is little moreover, with low costs, output efficiency is high. A nonlinear amplification loop mirror is formed by the 8-shaped cavity, so that mode locking operation is realized, and ultrashort pulse width laser output is obtained; and a mode selection coupler is arranged in the cavity, so that high-purity and high-efficiency ultrashort pulse column vector laser output is realized.
For solving the technical problem the utility model provides a technical scheme be an 8 word chamber mode locking post vector fiber laser based on mode selection coupler, include: the device comprises a pumping source, a wavelength division multiplexer, a gain fiber, a single-mode fiber, a first polarization controller, a second polarization controller, a 3dB coupler, an isolator, a coupler and a mode selection coupler; the output end of the pumping source is connected with the short-wavelength input end of the wavelength division multiplexer, the output end of the wavelength division multiplexer is connected with the 1-port input end of the 3dB coupler sequentially through the gain fiber, the single-mode fiber and the first polarization controller, the 2-port input end of the 3dB coupler is connected with the long-wavelength port of the wavelength division multiplexer, the 4-port of the 3dB coupler is connected with the 3-port of the 3dB coupler sequentially through the isolator, the coupler and the mode selection coupler to form an 8-shaped resonant cavity, and the second polarization controller is connected with the few-mode fiber output end of the mode selection coupler.
Furthermore, the mode selection coupler can selectively output different modes at different fiber output ends, has two functions of mode conversion and mode selection, and has small insertion loss.
Due to the action of a nonlinear amplification loop mirror in the 8-shaped cavity, optical pulses are output from the output end of the 4 port of the 3dB coupler, enter the input end of the mode selection coupler after passing through the isolator and the coupler, the mode selection coupler realizes mode conversion from a fundamental mode LP01 to a high-order mode LP11, the fundamental mode LP01 is output from the output port of the single-mode fiber, and the high-order mode LP11 is output from the output end of the few-mode fiber.
And a nonlinear amplification ring mirror formed in the 8-shaped resonant cavity is used as a saturable absorber for mode locking, and when the first polarization controller is adjusted, ultrashort optical pulses are output at the output end.
By adjusting the second polarization controller, ultrashort pulse column vector laser which is annularly distributed and has higher polarization purity can be obtained at the output end of the few-mode fiber.
Compared with the prior art, the utility model has the following technical effects;
(1) the utility model uses the mode selection coupler as the mode conversion device in the laser resonant cavity, the loss is small, the efficiency is high, and the obtained column vector light polarization purity is high; the mode selection coupler is used as a mode selection device in a laser resonant cavity to replace few-mode gratings, and the mode selection coupler is economical, convenient and high in cost performance.
(2) The utility model discloses a full optical fiber 8 words resonant cavity realizes the laser mode locking, simple structure, and output laser pulse width is narrow and stable performance.
(3) The utility model discloses an all-fiber structure, laser instrument output efficiency is high, and compact structure does not receive external factor to disturb, but continuous stable operation.
Drawings
Fig. 1 is a schematic diagram of a mode selection coupler.
FIG. 2 is a graph of effective refractive index at 1550 nm for the LP01 mode in single mode fibers and the LP11 mode in few mode fibers as a function of fiber radius.
Fig. 3 is a graph of power periodic exchange in a coupling region by simulating LP01 mode in a single mode fiber and LP11 mode in a few mode fiber with Rsoft software.
Fig. 4 is a diagram of the mode spot of the mode selective coupler in the high-order mode (LP11) at the output end of the few-mode fiber, obtained by the CCD test.
FIG. 5 is a schematic structural diagram of an 8-shaped cavity mode-locked column vector fiber laser based on a mode selection coupler
FIG. 6 is a graph of the output spectrum of an 8-cavity mode-locked column vector fiber laser based on a mode-selective coupler.
FIG. 7 is a waveform of the output time domain of an 8-cavity mode-locked column vector fiber laser based on a mode selective coupler; wherein (a) multiple time domain pulse shape maps are output for the laser, and (b) a single time domain pulse shape map is output for the laser.
FIG. 8 is a column vector laser mode spot pattern obtained by CCD detection and a laser mode spot pattern after a polarizer is added; the polarized light field distribution is obtained by adding angular polarized laser output into a polarizing plate and changing the optical axis direction of the polarizing plate, (f) the polarized light field distribution is obtained by adding radial polarized laser into the polarizing plate and changing the optical axis direction of the polarizing plate, and the polarized light field distribution is obtained by adding radial polarized laser into the polarizing plate and changing the optical axis direction of the polarizing plate.
Fig. 9 is a graph of the average power of the laser output pulses as a function of pump power.
Detailed Description
The technical solution of the present invention will now be described in further detail with reference to the accompanying drawings.
The utility model provides an 8 word chamber mode locking post vector fiber laser based on mode selection coupler, including pumping source, wavelength division multiplexer, gain fiber, first polarization controller, second polarization controller, single mode fiber, 3dB coupler, isolator, mode selection coupler; the output end of the pumping source is connected with the short-wavelength input end of the wavelength division multiplexer, the output end of the wavelength division multiplexer is connected with the 1-port input end of the 3dB coupler sequentially through the gain fiber, the single-mode fiber and the first polarization controller, the 2-port output end of the 3dB coupler is connected with the long-wavelength port of the wavelength division multiplexer, the 4-port of the 3dB coupler is connected with the isolator, the coupler and the 3-port of the mode selection coupler and the 3-port of the 3dB coupler to form an 8-shaped resonant cavity, and the second polarization controller is connected with the few-mode fiber output end of the mode selection coupler.
The mode selection coupler converts a fundamental mode (LP01) in a single-mode fiber into a high-order mode (LP11) in a few-mode fiber, outputs LP01 mode at a single-mode fiber output port, outputs LP11 mode at a few-mode fiber output port, selectively outputs different modes at different fiber output ends, has two functions of mode conversion and mode selection, and is small in insertion loss.
The utility model discloses utilize the nonlinear amplification ring mirror that constitutes in the 8 word chamber to carry out mode locking pulse output, through adjusting first polarization controller, the pulse of output is at the nanosecond rank.
The utility model discloses a mode selection coupler and the combined action in 8 word chambeies adjust first polarization controller and second polarization controller, will obtain the higher ultrashort pulse post vector laser of polarization purity at the coupler output.
The utility model discloses combine 8 word chamber mode locking techniques, realize a mode locking post vector fiber laser. The output spectrum is stable, the loss is small, the pulse width is narrow, and the polarization purity of the column vector light is high.
Fig. 1 is a schematic diagram of a mode selection coupler, which operates according to the following principle:
according to a coupling mode theory and a coupling mode equation:
where z represents the distance of coupling, β1And β2Propagation constants of a certain mode excited in the LP01 mode and the few-mode fiber in the single-mode fiber respectively; a. the1And A2The mode field amplitudes of the excited certain mode in the LP01 mode and the few-mode fiber in the single-mode fiber respectively; c11And C22Is a self-coupling coefficient; c12And C21Are mutual coupling coefficients. The self-coupling coefficient is small and negligible relative to the mutual coupling coefficient, and is approximately C12＝C21And (C), calculating the optical power of two output ports of the coupler according to the formula:
when β2In a few-mode optical fiberIf the phase difference is Delta β is β at the propagation constant of LP11 mode1-β2And is zero, i.e., the LP01 mode in single mode fiber and the LP11 mode in few mode fiber reach a condition of phase matching, at which time,
P1(z)＝cos2(cz),P2(z)＝sin2(cz)。
the above equation shows that, under the condition of phase matching, the two modes perform periodic power exchange, and the function of converting the LP01 mode into the LP11 mode is realized; the LP01 mode is output at the output end of the single-mode optical fiber, the LP11 mode is output at the output end of the few-mode optical fiber, and different modes are selectively output at different output ends of the optical fiber, so that the function of mode selection is realized.
The phase matching is realized by the method that the phase β is equal to neffk0Wherein k is0Is a propagation constant in vacuum, neffThe effective refractive index of a mode varies with the diameter of the fiber, so that when the diameter of the single-mode fiber and the diameter of the few-mode fiber are matched, the phases of the LP01 mode in the single-mode fiber and the LP11 mode in the few-mode fiber are matched. Fig. 2 shows the variation of the effective refractive index of LP01 mode in single mode fiber and LP11 mode in few mode fiber at 1550 wavelength with the variation of core radius obtained by simulation with COMSOL software. Fig. 3 is a simulation diagram showing the periodic power exchange between the LP01 mode and the LP11 mode obtained by simulation calculation based on the Beam Propagation Method (BPM) using the diameter parameter of the optical fiber for phase matching obtained by Rsoft simulation. The mode selection coupler is manufactured by a fused biconical taper method according to simulation parameters shown in fig. 3, the mode spots at the output end of the few-mode fiber are observed by a CCD (charge coupled device), and as shown in fig. 4, the purity of a high-order mode (LP11) at the output end of the few-mode fiber of the mode selection coupler is measured to be more than 96%, and the insertion loss of the mode selection coupler is less than 1 dB.
Fig. 5 is a schematic structural diagram of the present invention, an 8-shaped cavity mode-locked column vector fiber laser based on a mode selection coupler. The device comprises a pumping source, a wavelength division multiplexer, a gain fiber, a single-mode fiber, a first polarization controller, a second polarization controller, a 3dB coupler, an isolator, a coupler and a mode selection coupler; wherein,
the output end of the pumping source is connected with the short-wavelength input end of the wavelength division multiplexer, the output end of the wavelength division multiplexer is connected with the 1-port input end of the 3dB coupler sequentially through the gain fiber, the single-mode fiber and the first polarization controller, the 2-port output end of the 3dB coupler is connected with the long-wavelength port of the wavelength division multiplexer, the 4-port of the 3dB coupler is connected with the isolator, the coupler and the 3-port of the mode selection coupler to form an 8-shaped resonant cavity, and the second polarization controller is connected with the few-mode fiber output end of the mode selection coupler.
The working principle of the utility model is as follows: the pump source is used as the excitation source of the 8-shaped resonant cavity and is used for outputting pump light to the short-wavelength input end of the wavelength division multiplexer, the wavelength division multiplexer is used for multiplexing pump light with different wavelengths and feedback laser input by the long-wavelength input end of the wavelength division multiplexer into the optical fiber resonant cavity, the gain fiber (erbium-doped) is used for providing light amplification, the nonlinear effect of the standard single-mode fiber is increased, the first polarization controller controls the polarization state of the light, the 3dB coupler is used for splitting the light and divides the light into two paths, the first path is optically connected with the long-wavelength end of the wavelength division multiplexer, the second path is optically connected with the optical isolator (ensuring unidirectional transmission of the light), then the coupler is connected, a small amount of light is used as the output end for detection, most of the light is left in the resonant cavity for resonance, and then the high-order mode is output by the few-, the single-mode fiber output end of the mode selection coupler is connected with the other input end of the 3dB coupler to form an 8-shaped resonant cavity. The laser device comprises a gain fiber, a single-mode fiber, a first polarization controller and a 3dB coupler, wherein the gain fiber, the single-mode fiber, the first polarization controller and the 3dB coupler are arranged in a resonant cavity on the left side of an 8-shaped resonant cavity, the non-linear amplification environment of the fiber is formed to realize mode locking on the light, a mode-locked fiber laser device is formed, the 8-shaped resonant cavity outputs a high-order mode at the output end of a few-mode fiber due to the existence of a mode selection coupler, the polarization state of a mode field is accurately controlled by adjusting a second polarization controller, and column vector laser which is annularly distributed and has high polarization purity is obtained. The whole 8-shaped resonant cavity can realize mode locking pulse output and column vector laser output.
FIG. 6 shows the output spectrum of an 8-cavity mode-locked cylindrical vector fiber laser based on a mode selective coupler, with a bandwidth of 5.5nm, a center wavelength of 1556nm, and a side-mode suppression ratio of 35 dB.
FIG. 7 is a diagram showing the output waveform of an 8-cavity mode-locked column vector fiber laser based on a mode selection coupler; wherein (a) multiple time domain waveforms are output for the laser, and (b) a single time domain waveform is output for the laser, and the pulse width obtained from the graphs is about 20ns, and the pulse repetition frequency is 0.66 MHz.
FIG. 8 shows a cylindrical vector laser mode pattern obtained by CCD detection and a laser mode pattern after a polarizer is added; the polarized light field distribution is obtained by adding angular polarized laser output into a polarizing plate and changing the optical axis direction of the polarizing plate, (f) the polarized light field distribution is obtained by adding radial polarized laser into the polarizing plate and changing the optical axis direction of the polarizing plate, and the polarized light field distribution is obtained by adding radial polarized laser into the polarizing plate and changing the optical axis direction of the polarizing plate. The test results showed that the polarization purity of the obtained column vector beam was more than 91.3%.
Fig. 9 is a graph of the average power of the laser output pulses as a function of pump power. The experimental test results that the slope efficiency of the laser is 1.5%.
The above-mentioned embodiments further explain the objects, technical solutions and advantages of the present invention in detail. It should be understood that the above description is only exemplary of the present invention and is not intended to limit the scope of the present invention, and that all changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the present invention should be considered within the scope of the present invention.
Claims (5)
1. An 8-cavity mode-locked column vector fiber laser based on a mode selection coupler, comprising: the device comprises a pumping source, a wavelength division multiplexer, a gain fiber, a single-mode fiber, a first polarization controller, a second polarization controller, a 3dB coupler, an isolator, a coupler and a mode selection coupler; wherein,
the output end of the pump source is connected with the short-wavelength input end of the wavelength division multiplexer, the output end of the wavelength division multiplexer is connected with the 1-port input end of the 3dB coupler sequentially through the gain fiber, the single-mode fiber and the first polarization controller, the 2-port input end of the 3dB coupler is connected with the long-wavelength port of the wavelength division multiplexer, the 4-port of the 3dB coupler is connected with the 3-port of the 3dB coupler sequentially through the isolator, the coupler and the mode selection coupler to form an 8-shaped resonant cavity, and the second polarization controller is connected with the few-mode fiber output end of the mode selection coupler.
2. The 8-cavity mode-locked column vector fiber laser based on the mode selective coupler of claim 1, wherein the mode selective coupler can selectively output different modes at different fiber output ends, has two functions of mode conversion and mode selection, and has small insertion loss.
3. The 8-shaped cavity mode-locked column vector fiber laser based on the mode selection coupler of claim 2, wherein due to the action of the nonlinear amplification loop mirror in the 8-shaped cavity, optical pulses are output from the output end of the 4-port of the 3dB coupler, enter the input end of the mode selection coupler after passing through the isolator and the coupler, mode conversion from the fundamental mode LP01 to the high-order mode LP11 is realized through the mode selection coupler, the fundamental mode LP01 is output at the output end of a single-mode fiber, and the high-order mode LP11 is output at the output end of a few-mode fiber.
4. The 8-shaped cavity mode-locked column vector fiber laser based on the mode selection coupler of claim 1, wherein the mode locking is performed by using a non-linear amplification ring mirror formed in the 8-shaped cavity as a saturable absorber, and when the first polarization controller is adjusted, the ultra-short optical pulse is output at the output end.
5. The 8-shaped cavity mode-locked column vector fiber laser based on the mode selection coupler of claim 4, wherein the ultrashort pulse column vector laser with annular distribution and high polarization purity is obtained at the output end of the few-mode fiber by adjusting the second polarization controller.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106848823A (en) * | 2017-03-06 | 2017-06-13 | 南京邮电大学 | A kind of 8 word chamber locked mode post vector optical fiber lasers based on model selection coupler |
| CN108321667A (en) * | 2018-03-21 | 2018-07-24 | 华中科技大学 | A kind of fiber laser light source of vector scalar pulse bidirectional output |
| CN108695679A (en) * | 2018-05-23 | 2018-10-23 | 南京邮电大学 | A kind of changeable column vector beam actively Q-switched optical fiber laser of angular/radial polarisation based on fiber fuse mode converter |
| CN109946793A (en) * | 2019-05-09 | 2019-06-28 | 上海大学 | A kind of wavelength division multiplexer and a kind of stimulated emission depletion beam multiplexers |
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2017
- 2017-03-06 CN CN201720209710.4U patent/CN206524516U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106848823A (en) * | 2017-03-06 | 2017-06-13 | 南京邮电大学 | A kind of 8 word chamber locked mode post vector optical fiber lasers based on model selection coupler |
| CN106848823B (en) * | 2017-03-06 | 2023-09-05 | 南京邮电大学 | 8-shaped cavity mode locking column vector fiber laser based on mode selection coupler |
| CN108321667A (en) * | 2018-03-21 | 2018-07-24 | 华中科技大学 | A kind of fiber laser light source of vector scalar pulse bidirectional output |
| CN108695679A (en) * | 2018-05-23 | 2018-10-23 | 南京邮电大学 | A kind of changeable column vector beam actively Q-switched optical fiber laser of angular/radial polarisation based on fiber fuse mode converter |
| CN109946793A (en) * | 2019-05-09 | 2019-06-28 | 上海大学 | A kind of wavelength division multiplexer and a kind of stimulated emission depletion beam multiplexers |
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