CN204118459U - High power tunable pulse optical fiber - Google Patents
High power tunable pulse optical fiber Download PDFInfo
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- CN204118459U CN204118459U CN201420545048.6U CN201420545048U CN204118459U CN 204118459 U CN204118459 U CN 204118459U CN 201420545048 U CN201420545048 U CN 201420545048U CN 204118459 U CN204118459 U CN 204118459U
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Abstract
The utility model is applicable to field of laser device technology, provides a kind of high power tunable pulse optical fiber and the super continuum source by its pumping.This high power tunable pulse optical fiber comprises successively on optical path direction: based on tunable passive mode-locking fiber laser, broadband optical fiber coupler, power pre-amplification stage, the main amplifying stage of power of fiber nonlinear effect.The super continuous spectrums such as photonic crystal fiber or highly nonlinear optical fiber that this high power tunable pulse optical fiber output and zero-dispersion wavelength are positioned at its pumping laser gain region produces optical fiber and is connected, the exact matching that pumping laser and super continuous spectrums produce zero-dispersion wavelength of fiber can be realized, and then obtain the high smooth super continuum source in broadband.This device has that structure is simple, pumping laser wavelength tuning convenient, cost is low and the feature of all-fiber, can be applicable in the fields such as biomedicine, remote sensing, environmental monitoring, multichannel light fiber communication and spectroscopy.
Description
Technical field
The utility model belongs to field of laser device technology, particularly relates to a kind of high power tunable pulse optical fiber based on nonlinear fiber passive mode locking seed source and the super continuum source based on this high power tunable pulse optical fiber pumping.
Background technology
Ultra broadband light source has demand widely in the various aspects of life.As the incandescent lamp of conventional broadband light source and the spectral region of fluorescent lamp wider, but luminosity is lower, and is not coherent light, beam quality is also poor; Although laser has good spatial coherence and very high brightness, and have good single-mode beams quality, laser is normally monochromatic.And this contradiction can be solved well based on the super continuum source of laser pumping.
Super continuous spectrums (SC) refers to that the laser pulse of a branch of high strength is by after nonlinear dielectric, the broadband spectral much larger than its incident light spectrum of generation.Due to the spatial coherence, high brightness, the ultra broadband characteristic that have had, super continuum source can have the same spectrum width of the incandescent lamp high brightness the same with laser simultaneously, it is equivalent to a ultra broadband laser, has important application prospect in fields such as biomedicine, laser spectroscopy, environmental monitoring, remote sensings.
It is the core objective that super continuous spectrums research is pursued that broadband, high flat spectrum export.The mainstream technology of current generation super continuous spectrums utilizes high-capacity optical fiber laser pump photon crystal fiber or nonlinear optical fiber to realize.The generation of the smooth super continuous spectrums in broadband has very harsh requirement for the relative position of pumping wavelength and zero-dispersion wavelength of fiber: pumping laser wavelength will be positioned at optical fiber the anomalous dispersion region and as far as possible close to zero-dispersion wavelength of fiber, be beneficial to the expanding of ultrashort pulses of pumping evolution to normal dispersion region, the deviation of more than 10nm will cause super continuous spectrums spectral quality obviously to decline therebetween.But, due to the restriction on fiber draw process, there is certain deviation in the zero-dispersion wavelength of fiber that reality draws out and designed zero-dispersion wavelength of fiber, and the current fiber laser for super continuous spectrums generation has fixing optical maser wavelength usually, thus many restrictions are created to the raising of the expansion of super continuous spectrums shortwave and flatness.
Utility model content
First technical problem to be solved in the utility model is to provide a kind of high power tunable pulse optical fiber, and it is simple that this laser has structure, tunable, high power, the feature of all-fiber.
The utility model realizes like this, a kind of high power tunable pulse optical fiber, it is characterized in that, optical path direction comprises successively: based on tunable passive mode-locking fiber laser, broadband optical fiber coupler, power pre-amplification stage, the main amplifying stage of power of fiber nonlinear effect; Wherein, the tunable wave length of the laser pulse of the described tunable passive mode-locking fiber laser output based on fiber nonlinear effect.
Further, between the described tunable passive mode-locking fiber laser based on fiber nonlinear effect and described broadband optical fiber coupler, be also provided with:
First band optical fiber isolator, for ensureing the one-way transmission of tunable pulsed laser, avoids the laser fed back in its subsequent optical path to cause damage to its prime light path.
Further, described broadband optical fiber coupler is 2 × 2 broadband optical fiber couplers, one of them high coupling ratio input arm connects the output of described first band optical fiber isolator, low coupling ratio input arm is for monitoring the feedback laser in rear level system, high coupling ratio output arm connects the seed input of power pre-amplification stage, and low coupling ratio output arm is for monitoring wavelength and the time domain specification of Output of laser.
Further, between described power pre-amplification stage and the main amplifying stage of described power, be also provided with:
Second band optical fiber isolator, for ensureing the one-way transmission of tunable pulsed laser, avoids the laser fed back in its subsequent optical path to cause damage to its prime light path.
Further, described power pre-amplification stage comprises the fiber amplifier of multiple cascade.
Further, the main amplifying stage of described power comprises:
Pumping source;
Gain media;
Optical-fiber bundling device, its seed arm connects described pre-amplification stage output, and receive the laser pulse that described pre-amplification stage exports, its pumping arm connects described pumping source, and its output connects described gain media; Described pumping source closes bundle pumping rear class gain media by its pumping arm.
Further, described pumping source comprises multiple optical fibre output semiconductor laser.
Further, described gain media is active doping double-cladding optical fiber.
Second technical problem to be solved in the utility model is to provide a kind of super continuum source based on high power tunable pulse optical fiber as above pumping, comprising:
High power tunable pulse optical fiber as above;
Produce optical fiber with the super continuous spectrums of described high power tunable pulse optical fiber welding, its zero-dispersion wavelength is positioned at high power tunable pulse optical fiber gain region, for high power pulsed laser being evolved into the high smooth super continuous spectrums in broadband wherein.
Further, the output of described super continuous spectrums generation optical fiber is connected with the optical fiber end cap for preventing output end face laser reflection.
High power tunable pulse optical fiber provided by the utility model, realizes based on nonlinear fiber passive mode locking seed source, power pre-amplification stage, the main amplifying stage of power, can be used as the pumping source producing super continuous spectrums.Utilization is mixed ytterbium, is mixed thulium, active doping optical fibre laser seed source and the amplifier such as er-doped or erbium and ytterbium codoping, the high power tunable pulse optical fiber of the wave bands such as 1 μm, 2 μm and 1.5 μm can be realized, and then pumping dispersion coupling highly nonlinear optical fiber or photonic crystal fiber, realize the high smooth super continuous spectrums in broadband to export, its structure is simple, wavelength tuning is convenient, and cost is low, and has the feature of all-fiber.
Accompanying drawing explanation
Fig. 1 is the optical structure chart of the super continuum source based on this high power tunable pulse optical fiber pumping that the utility model provides;
Fig. 2 is the passive mode-locking fiber laser structure chart based on nonlinear polarization rotation effect that the utility model provides;
Fig. 3 is the passive mode-locking fiber laser structure chart based on Image magnify annular mirror that the utility model provides;
Fig. 4 is the passive mode-locking fiber laser structure chart based on nonlinear optical loop mirror that the utility model provides.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Because the cost being obtained required zero-dispersion wavelength by optical fiber repeatedly pulling is higher, the utility model is set about from pumping laser aspect for this reason, tunable wave length pulse optical fiber based on nonlinear fiber passive mode-locking fiber laser seed source is proposed as producing the pumping source of super continuous spectrums, realize the exact matching of pumping laser and zero-dispersion wavelength of fiber, and then obtain the high smooth super continuum source in broadband.
The tunable passive mode-locking fiber laser compact conformation based on fiber nonlinear effect that the utility model adopts, cost are low, good stability, and its ultra-short pulse laser produced has broad application prospects in various fields such as material surface process, communication remote sensing, biomedicine, super continuous spectrums generations.
Tunable passive mode-locking fiber laser based on fiber nonlinear effect mainly adopts annular chamber and two kinds, figure of eight chamber structure, that is: based on the annular chamber of nonlinear polarization rotation (NPR) effect, the figure of eight chamber based on Image magnify annular mirror (NALM) or nonlinear optical loop mirror (NOLM).Mode locked fiber laser based on these two kinds of structures not only can obtain high-octane ultra-short pulse laser and export, and the laser pulse exported also has tunable wave length characteristic.
But, consider that the tunable pulse optical fiber power output based on above two kinds of structures is lower, be only milliwatt magnitude, unrestricted for making it apply, the utility model proposes again the seed dependency characteristic of the tunable wave length characteristic of the tunable passive mode-locking fiber laser based on fiber nonlinear effect with master oscillation power amplification (MOPA) to combine, realize a kind of high power tunable pulse optical fiber based on nonlinear fiber passive mode locking seed source, and then with this tunable wave length pulse optical fiber pump photon crystal fiber or highly nonlinear optical fiber, realize the high smooth super continuum source in broadband.Wherein, the Output of laser characteristic of master oscillation power amplification (MOPA) depends on injected seed laser characteristic.
Based on above-mentioned principle, Fig. 1 shows the optical texture of the super continuum source based on this high power tunable pulse optical fiber pumping that the utility model provides.Wherein, the optical texture of the high power tunable pulse optical fiber that the Part I shown in 1-11 provides for the utility model, and the super continuous spectrums generation level that the Part II shown in 13-15 provides for the utility model, 12 is two-part fusion point.
With reference to Fig. 1, this high power tunable pulse optical fiber of Part I at least optical path direction comprises successively: based on the tunable passive mode-locking fiber laser 1 of fiber nonlinear effect, broadband optical fiber coupler 3, power pre-amplification stage 6, the main amplifying stage 11 of power, also can comprise the first band optical fiber isolator 2 and the second band optical fiber isolator 7 further, first band optical fiber isolator 2 is based between the tunable passive mode-locking fiber laser 1 of fiber nonlinear effect and broadband optical fiber coupler 3, and the second band optical fiber isolator 7 is between power pre-amplification stage 6 and the main amplifying stage 11 of power.
First band optical fiber isolator 2, for ensureing the one-way transmission of tunable pulsed laser, avoids the laser fed back in its subsequent optical path to cause damage to its prime light path, and then the steady running of the system of guarantee.Broadband optical fiber coupler 3 adopts the structure of 2 × 2, its high coupling ratio input arm connects band optical fiber isolator 2, feedback laser after low coupling ratio input arm can combine with photodetector and monitor in level system, high coupling ratio output arm connects the seed input of power pre-amplification stage 6, and low coupling ratio output arm can combine with spectrometer, photodetector the wavelength and time domain specification of monitoring Output of laser.Second band optical fiber isolator 7 is same avoids the laser fed back in its subsequent optical path to cause damage to its prime light path for ensureing the one-way transmission of tunable pulsed laser seed, and then the steady running of the system of guarantee.
Power pre-amplification stage 6 comprises the fiber amplifier 4 and 5 of at least two-stage cascade, for the tunable pulse seed laser of milliwatt level is carried out power pre-amplification, by two-stage pre-amplification, for power amplification below provides sufficient seed power.
The main amplifying stage of power 11 realizes the output of high power tunable pulse laser for carrying out the main amplification of power to the tunable pulsed laser after two-stage pre-amplification, as shown in Figure 1, the main amplifying stage 11 of power specifically comprises pumping source 8, optical-fiber bundling device 9, gain media 10, the seed arm of optical-fiber bundling device 9 connects the output of pre-amplification stage 6, for receiving the laser pulse that pre-amplification stage 6 exports, its pumping arm connects described pumping source, its output connects gain media 10, and described pumping source 8 closes the active doping double-cladding optical fiber of bundle pumping rear class by its pumping arm.
Above-mentioned pumping source 8 can adopt multiple optical fibre output semiconductor laser to realize, and gain media 10 adopts active doping double-cladding optical fiber.
The super continuous spectrums of Part II produces level 15 and comprises successively on optical path direction: super continuous spectrums produces optical fiber 13 and optical fiber end cap 14, super continuous spectrums produces optical fiber 13 and has high non-linearity characteristic, its zero-dispersion wavelength is positioned at high power tunable pulse optical fiber gain region, high power pulsed laser is evolved into the high smooth super continuous spectrums in broadband wherein, and high non-linear photon crystal optical fiber or highly nonlinear optical fiber can be adopted to realize.Optical fiber end cap 14 produces the laser reflection of the output end face of optical fiber 13 to the impact of system for preventing super continuous spectrums.
The tunable wave length of the laser pulse that the above-mentioned tunable passive mode-locking fiber laser 1 based on fiber nonlinear effect exports, specifically can select the annular chamber passive mode-locking fiber laser (shown in Figure 2) based on nonlinear polarization rotation effect (NPR), or based on figure of eight chamber passive mode-locking fiber laser (shown in Figure 3) of Image magnify annular mirror (NALM), or based on figure of eight chamber passive mode-locking fiber laser (shown in Figure 4) of nonlinear optical loop mirror (NOLM).
Fig. 2 is the annular chamber passive mode-locking fiber laser structure based on nonlinear polarization rotation effect (NPR), and annular chamber is disposed with the first optical-fiber type Polarization Controller 111, fibre optic isolater 12, the optical fiber polarizer 13, second optical-fiber type Polarization Controller 114, fiber coupler 15, active doping optical fibre 116, wavelength division multiplexer (WDM) 117, monomode fiber output semiconductor laser 118.Wherein, the first optical-fiber type Polarization Controller 111 and the second optical-fiber type Polarization Controller 114 are for changing the polarization state of endovenous laser, and fibre optic isolater 112 ensures the one-way transmission of endovenous laser, and the optical fiber polarizer 113 is for generation of linearly polarized laser; Output arm access annular chamber of fiber coupler 115, another output arm are as the output of laser, active doping optical fibre 116 is as laser gain medium, wavelength division multiplexer (WDM) 117 realizes the pumping of pumping source to Active Optical Fiber, and monomode fiber output semiconductor laser 118 is the pumping sources as laser.
Fig. 3 and Fig. 4 is the passive mode-locking fiber laser structure based on Image magnify annular mirror and nonlinear optical loop mirror, and two kinds of mould-locking structure devices used are identical, and just the position of device in chamber is different.Wherein, 121 is optical-fiber type Polarization Controllers; 122 is monomode fiber output semiconductor lasers; 123 is wavelength division multiplexer (WDM); 124 is active doping optical fibres; 125 is 2 × 2 type 50:50 fiber couplers; 126 is optical-fiber type Polarization Controllers; 127 is fibre optic isolaters; 128 is fiber couplers, and in this structure, the function of each device is identical with the function in NPR structure.In the figure of eight chamber shown in Fig. 3, first annular chamber and the second annular chamber intersect at 2 × 2 type 50:50 fiber couplers 125, first annular chamber is followed successively by: 2 × 2 type 50:50 fiber couplers 125, optical-fiber type Polarization Controller 126, fibre optic isolater 127, fiber coupler 128, and and annular chamber is followed successively by: optical-fiber type Polarization Controller 121, monomode fiber output semiconductor laser 122, wavelength division multiplexer (WDM) 123, active doping optical fibre 124,2 × 2 type 50:50 fiber coupler 125.The difference of the figure of eight chamber shown in Fig. 4 and Fig. 3 is, is moved to the second annular chamber by fibre optic isolater 127 from the first annular chamber, and is positioned between active doping optical fibre 124 and 2 × 2 type 50:50 fiber coupler 125.
After the tunable passive mode-locking fiber laser based on fiber nonlinear effect having been connected according to one of above-mentioned three kinds of structures, exported by the pulse laser regulating the polarization direction of two Polarization Controllers in laser cavity to realize different centre wavelength.Principle is: the filter effect guided based on birefringence, mode locking pulse under different polarization states has different centre wavelength, therefore the laser pulse regulating Polarization Controller direction can realize tunable wave length in this passive mode-locking fiber laser exports, realize the power amplification of different wave length mode locking pulse again through master oscillation power amplification (MOPA) level, high power tunable pulse can be obtained and export.Wherein, when considering that tunable laser seed centre wavelength and fiber amplifier photoluminescence peak wavelength do not mate in amplification process, the amplified spont-aneous emission (ASE) that the seed power deficiency injected in fiber amplifier may cause causes damage to system, and the multistage amplification that therefore master oscillation power amplification (MOPA) level adopts power pre-amplification stage mentioned above, the main amplifying stage of power to form by the utility model especially realizes.
To sum up, high power tunable pulse optical fiber structure provided by the utility model is simple, wavelength tuning is convenient, the feature of the low and all-fiber of cost, can be applicable to the aspect such as light source of pumping source that the smooth super continuous spectrums in broadband produces, stream type cell analyzer.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.
Claims (10)
1. a high power tunable pulse optical fiber, is characterized in that, optical path direction comprises successively: based on tunable passive mode-locking fiber laser, broadband optical fiber coupler, power pre-amplification stage, the main amplifying stage of power of fiber nonlinear effect; Wherein, the tunable wave length of the laser pulse of the described tunable passive mode-locking fiber laser output based on fiber nonlinear effect.
2. high power tunable pulse optical fiber as claimed in claim 1, is characterized in that, between the described tunable passive mode-locking fiber laser based on fiber nonlinear effect and described broadband optical fiber coupler, be also provided with:
First band optical fiber isolator, for ensureing the one-way transmission of tunable pulsed laser, avoids the laser fed back in its subsequent optical path to cause damage to its prime light path.
3. high power tunable pulse optical fiber as claimed in claim 2, it is characterized in that, described broadband optical fiber coupler is 2 × 2 broadband optical fiber couplers, one of them high coupling ratio input arm connects the output of described first band optical fiber isolator, low coupling ratio input arm is for monitoring the feedback laser in rear level system, high coupling ratio output arm connects the seed input of power pre-amplification stage, and low coupling ratio output arm is for monitoring wavelength and the time domain specification of Output of laser.
4. high power tunable pulse optical fiber as claimed in claim 1, is characterized in that, between described power pre-amplification stage and the main amplifying stage of described power, be also provided with:
Second band optical fiber isolator, for ensureing the one-way transmission of tunable pulsed laser, avoids the laser fed back in its subsequent optical path to cause damage to its prime light path.
5. high power tunable pulse optical fiber as claimed in claim 1, it is characterized in that, described power pre-amplification stage comprises the fiber amplifier of multiple cascade.
6. high power tunable pulse optical fiber as claimed in claim 1, it is characterized in that, the main amplifying stage of described power comprises:
Pumping source;
Gain media;
Optical-fiber bundling device, its seed arm connects described pre-amplification stage output, and receive the laser pulse that described pre-amplification stage exports, its pumping arm connects described pumping source, and its output connects described gain media; Described pumping source closes bundle pumping rear class gain media by its pumping arm.
7. high power tunable pulse optical fiber as claimed in claim 6, it is characterized in that, described pumping source comprises multiple optical fibre output semiconductor laser.
8. high power tunable pulse optical fiber as claimed in claim 6, it is characterized in that, described gain media is active doping double-cladding optical fiber.
9., based on a super continuum source for the high power tunable pulse optical fiber pumping as described in any one of claim 1 to 8, it is characterized in that, comprising:
High power tunable pulse optical fiber as described in any one of claim 1 to 8;
Produce optical fiber with the super continuous spectrums of described high power tunable pulse optical fiber welding, its zero-dispersion wavelength is positioned at high power tunable pulse optical fiber gain region, for high power pulsed laser being evolved into the high smooth super continuous spectrums in broadband wherein.
10. super continuum source as claimed in claim 9, is characterized in that, the output of described super continuous spectrums generation optical fiber is connected with the optical fiber end cap for preventing output end face laser reflection.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104300344A (en) * | 2014-09-22 | 2015-01-21 | 深圳大学 | High-power and tunable pulse fiber laser device |
| CN106207724A (en) * | 2016-08-31 | 2016-12-07 | 暨南大学 | A kind of tunable single-frequency optical fiber laser and its implementation |
-
2014
- 2014-09-22 CN CN201420545048.6U patent/CN204118459U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104300344A (en) * | 2014-09-22 | 2015-01-21 | 深圳大学 | High-power and tunable pulse fiber laser device |
| WO2016045396A1 (en) * | 2014-09-22 | 2016-03-31 | 深圳大学 | Pumped supercontinuum light source based on tunable pulse optical fiber laser |
| CN106207724A (en) * | 2016-08-31 | 2016-12-07 | 暨南大学 | A kind of tunable single-frequency optical fiber laser and its implementation |
| CN106207724B (en) * | 2016-08-31 | 2018-10-09 | 暨南大学 | A kind of tunable single-frequency optical fiber laser and its implementation |
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