CN102916328A - Compact all-fiber supercontinuum white-light source - Google Patents
Compact all-fiber supercontinuum white-light source Download PDFInfo
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- CN102916328A CN102916328A CN2012103810618A CN201210381061A CN102916328A CN 102916328 A CN102916328 A CN 102916328A CN 2012103810618 A CN2012103810618 A CN 2012103810618A CN 201210381061 A CN201210381061 A CN 201210381061A CN 102916328 A CN102916328 A CN 102916328A
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Abstract
The invention discloses a compact all-fiber supercontinuum white-light source, and relates to the field of white-light laser sources. Theoretically, a nonlinear polarization rotation mode-locked laser adopting an all-fiber structure serves as the oscillating stage, the output seed light is amplified and then coupled into high-nonlinearity photonic crystal fibers for nonlinear broadening so as to obtain supercontinuum white-light output; and structurally, the compact modularized design is adopted to optimize fiber coiling and the layout of other optical devices, the optical devices are integrated on a worktable, and a magnetic tape type fiber coiling tank of which the dimension is optimized is integrated on a base. Compared with a traditional white-light source which has the defects of large size, heavy weight, poor stability, high price, requirement for additional equipment to assist temperature reduction, and the like due to the adoption of a space coupling device, according to the invention, the photonic crystal fibers and single-mode fibers are directly fused through repeated low-current discharge, and the corresponding modularized design is adopted, the above defects are avoided, and both the performance of the whole machine and the compactness are improved.
Description
Technical field
The present invention relates to white light LASER Light Source field, relate in particular to a kind of compact all optical fiber supercontinuum light source.
Background technology
Time domain and the frequency domain of light pulse in highly nonlinear optical fiber develops, not only be subject to the impact of multiple nonlinear effects such as spontaneous phase-modulation (SPM), Cross-phase Modulation (XPM), four wave mixing (FWM), stimulated Raman scattering (SRS) and stimulated Brillouin scattering (SBS), also be subject to the impact of optical fiber dispersion characteristic, all these non-linear process can produce new frequency component.For enough strong pulse, can be with more than the hundreds of nanometers of spectrum widening, this phenomenon is referred to as the generation of ultra-wide spectrum.
The supercontinuum light source can be exported ultra-wide spectrum laser, and it has the field of high request that important application is arranged in biology, medical science, physics, national defence and industry etc. to low-coherence light source or spectrum analysis.In the current application process, the small size of super continuous wave laser and the pursuit of portability are improved day by day.Full-optical-fiber laser can not only guarantee the good of integrally-built compactness and heat radiation, more can realize the Laser output of high stable.Therefore the status do not replaced and good development prospect are arranged in actual applications.
In traditional research that the super continuum light spectrum is produced, be to come stretched-out spectrum with nonlinear crystal.But nonlinear crystal is very easily damaged when draw power improves, thereby causes the average output power of super continuous wave laser to be limited.After this, optical fiber is owing to its area of dissipation is used in the further research greatly, and the Dispersion Limitation of ordinary optic fibre the generation of high-quality super continuous spectrums.The appearance of photonic crystal fiber has then been opened new chapter for super continuous spectrums generates.Thereby the optical fiber parameter of photonic crystal fiber can be controlled by design inside of optical fibre micro-structural, and nonlinear interaction is abundant, and dispersion is controlled.Super continuous spectrums technology based on non-linear photon crystal optical fiber is studied interest widely because the using value in the fields such as spectroscopy, ultra-short pulse laser technology, frequency measurement and optical coherence tomography (OCT) has caused in the world.But photonic crystal fiber also has its remarkable shortcoming, such as with the problems such as the welding of ordinary optic fibre difficulty, splice loss, splice attenuation is large, the fiber manufacturing cost is high, difficult treatment.
The inventor finds to exist at least in the prior art following shortcoming and defect in realizing process of the present invention:
The present theoretical comparative maturity of the super continuous laser take photonic crystal fiber as the basis, but it is larger to be used for the general volume of ultrashort pulse laser of excitation photons crystal fiber, and weight is heavier, involves great expense; Simultaneously, many existing apparatus adopt set of lenses to do Space Coupling, and the set of lenses design is complicated, and bulky, efficient is lower, and is harsh to environmental requirement, is difficult to realize the Engineering Reliability requirement; In addition, because the low amount of heat that produces of coupling efficiency must lose by extra auxiliary equipment such as air-cooled or water-cooleds, this has further increased again the volume and weight of complete machine.
Summary of the invention
For solving the problems of the technologies described above, the invention provides a kind of compact all optical fiber supercontinuum light source, see for details hereinafter and describe:
A kind of compact all optical fiber supercontinuum light source comprises: laser module, described laser module comprise oscillator stage and amplifying stage two parts,
The oscillator stage structure is mixed ytterbium gain fibre, the first optical fiber collimator, a λ/4 wave plates, λ/2 wave plates, polarization beam apparatus, the 2nd λ/4 wave plates, birefringent filter, the second optical fiber collimator and fibre optic isolater for the first pumping source, the first fiber coupler, first that link to each other successively; The amplifying stage structure is mixed ytterbium gain fibre and high non-linear photon crystal optical fiber for the second pumping source, the second fiber coupler, second that link to each other successively; Be connected by monomode fiber between each section optical fiber and the above-mentioned device.
Adopt the 3rd fiber coupler to be coupled between described oscillator stage and the described amplifying stage.
Described the first pumping source and the second pumping source are specially: output wavelength is the semiconductor laser of 970nm.
Be direct welding between described high non-linear photon crystal optical fiber and the monomode fiber, adopt repeatedly low discharging current.
Also comprise: base,
Used each section optical fiber closely is coiled in the magnetic tape type fiber reel that integrates with described base in groove; Described the first fiber coupler, described the second fiber coupler, described the 3rd fiber coupler and described fibre optic isolater also are arranged on described magnetic tape type fiber reel in groove; Each section outer fiber is wrapped up soft heat-conducting silica gel sheet.
Described magnetic tape type fiber reel is provided with the transparent plastic cover plate on groove, described transparent plastic cover plate bottom is provided with boss, and described boss matches for fixed fiber around groove with described magnetic tape type fiber reel.
Also comprise: be equipped with the fixedly workbench of counterbore,
Described the first optical fiber collimator, a described λ/4 wave plates, described λ/2 wave plates, described polarization beam apparatus, described the 2nd λ/4 wave plates, described birefringent filter and described the second optical fiber collimator are integrated on the described workbench.
Also comprise: be provided with the side panel in U-shaped hole, also be provided with the second V-shaped groove on the described base,
The passage that pumping input optical fibre and supercontinuum output optical fibre fit in by described the second V-shaped groove on the described U-shaped hole on the described side panel and the described base.
Be provided with free curve fixing hole and free curve hole on the described base.
Also be provided with the laser loam cake on the described base; Also be provided with the first V-shaped groove on the described base, monomode fiber enters described magnetic tape type fiber reel in groove by the guiding of described the first V-shaped groove.
The beneficial effect of technical scheme provided by the invention is: complete machine all adopts aluminium alloy to make, and also can obtain good heat dispersion and light characteristic in the assurance device bulk strength.In addition, utilize the direct contact type heat radiation of aluminum alloy base can save water-cooled or air cooler heavy in the prior device, further reduce machine volume and weight.Above-mentioned design can so that whole laser because adjusting device and servicing unit are few both little, compact conformations of volume, increased again stability and reliability, simultaneously modular design also makes to be safeguarded and regulates more simple and easy to do; Time stability is good, temperature stability is good, assembling is safeguarded simply, just with integrated, modularization, cost is low, technique is simple, be easy to industrialization.
Description of drawings
Fig. 1 is the exploded perspective view of supercontinuum laser;
Fig. 2 is the structure chart of side panel;
Fig. 3 is the structure chart of workbench;
Fig. 4 is the structure chart of base;
Fig. 5 is the fundamental diagram of supercontinuum laser.
In the accompanying drawing, the list of parts of each label representative is as follows:
1: the laser loam cake; 2: side panel;
3: the transparent plastic cover plate; 4: workbench;
5: the free curve hole; 6: base;
7: the first pumping sources; 8: the second pumping sources;
9: the first optical fiber collimators; 10: the λ/4 wave plates;
11: the λ/2 wave plates; 12: polarization beam apparatus;
13: the two λ/4 wave plates; 14: birefringent filter;
15: the second optical fiber collimators; Mix the ytterbium gain fibre at 16: the first;
17: the first fiber couplers; 18: fibre optic isolater;
19: the second fiber couplers; 20: the three fiber couplers;
Mix the ytterbium gain fibre at 21: the second; 22: high non-linear photon crystal optical fiber;
23: monomode fiber; 24: the first V-type grooves;
25: the free curve fixing hole; 26: the second V-shaped grooves;
27:U type hole.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below embodiment of the present invention is described further in detail.
The embodiment of the invention is integrated into three modules by function:
1, shell stuck-module comprises:
Integrated streamlined laser loam cake 1 plays the effect that complete machine is supported in protection.Only need in the actual use procedure that the laser loam cake unloaded the running status of the output light detection laser that just can utilize easily polarization beam apparatus (PBS) 12 1 sides or adjust the mode-lock status of laser by the adjustment wave plate, remainder still remains on original position;
With the both sides panel 2 in U-shaped hole 27, be used in conjunction with the second V-type groove 26 on the base 6 and can play the fixedly effect of input-output optical fiber;
Transparent plastic dust cover 3 adopts transparent design, can observe directly the state of internal optical fiber and optical fibre device, is convenient to maintaining, plays fixing dustproof effect;
Around groove, the first V-type groove 24 bootable optical fiber at edge pass in and out grooves through dimensionally-optimised magnetic tape type fiber reel, and the boss on groove and the transparent plastic cover plate 3 cooperates optical fiber and the optical fibre device in the holddown groove simultaneously;
Place free curve hole 5 in the free curve fixing hole 25, the pressure by bolt is fixed white light source on optical table, so that no matter white light source is placed on the optical table optional position can fix neatly.
2, workbench (bench) 4 modules:
Through dimensionally-optimised workbench (bench) 4, reserve the counterbore that is used for fixing wave plate, polarization beam apparatus (PBS) 12, optical fiber collimator (collimator), simultaneously the bottom is a little more than base 6 lower planes, can not with under laser and the prerequisite that optical table separates easily with its dismounting and change himself or optical element fixed thereon.
3, laser module:
Laser module comprises oscillator stage and amplifying stage two parts, the nonlinear polarization rotation mode locked fiber laser of process numerical simulation of optimum is as oscillator stage, produce seed optical pulse, be coupled to and amplify among mixing ytterbium (Yb) gain fibre amplifying stage, so be coupled into high non-linear photon crystal optical fiber (PCF) thus carrying out non-linear broadening in 22 obtains supercontinuum output.
(1) numerical simulation
At first based on Ginzburg-Landau equation and Nonlinear Schrodinger Equation non-linear process, dispersion process and the gain process of soliton pulse in spread fiber carried out numerical simulation, choose optimum monomode fiber, mix ytterbium (Yb) gain fibre, high non-linear photon crystal optical fiber length for each major part, can when realizing high-quality pulse output, the non-linear broadening of frequency spectrum, guarantee cramped construction and lower cost with the assurance system.
(2) experiment is built
It is the single-mode output laser diode 7 pumping laser systems of 970nm that oscillator stage adopts output wavelength; the monomode fiber that is coated with plastic protective sleeve enters in the laser from the U-shaped hole 27 on the laser side panel 2; enter the magnetic tape type fiber reel in groove by the second V-type groove 26; be coupled into first through the first pumping coupler (WDM) 17 and pass transparent plastic cover plate 3 through the first V-type groove 24 again after mixing ytterbium (Yb) gain fibre 16; then by behind the collimation of upper the first optical fiber collimator (collimator) 9 installed of workbench bench4 more successively through a λ/4 wave plates 10; λ/2 wave plates 11; polarization beam apparatus (PBS) 12; the 2nd λ/4 wave plates 13; birefringent filter (BF) 14 and the second optical fiber collimator (collimator) 15; pass transparent dust-proof cover plate 3 by the guiding of the first V-type groove 24 and get back to the magnetic tape type fiber reel in groove, finish oscillation circuit one time by fibre optic isolater (ISO) 18 at last.
Soliton pulse in the oscillator stage optical fiber the effect of non-linear Kerr effect under can produce nonlinear phase shift.Because nonlinear phase shift is relevant with light intensity, thereby the nonlinear phase shift that the pulse different piece produces is different, thereby the polarization state of pulse each several part is changed.Make the peak value of light pulse can pass through polarization beam apparatus (PBS) 12 by adjusting wave plate, polarization beam apparatus (PBS) 12 then can not be passed through in the weak edge, front and back of intensity.Thereby make peak value more and more stronger, front and back along then more and more a little less than, form at last stable ultrashort pulse.Simultaneously, because the effect of chirp, the pulse different parts has different instantaneous frequencys, in system, introduce filter loss mechanism can be provided, the sideband of the centre frequency both sides that nonlinear effect is produced loses, and again importing realization ring cavity type structure in the gain fibre, light is propagated in optical fiber with the form of self similarity and stable output.This pulse shaping process is exactly to utilize the nonlinear polarization rotation effect of optical fiber to produce a passive mode locking mechanism that has from the quick saturable absorber of equivalence of amplitude modulation(PAM) (SAM) effect.
It is the single-mode output laser diode 8 pumping laser systems of 970nm that amplifying stage adopts output wavelength equally; U-shaped hole 27 from laser side panel 2 enters the monomode fiber that is coated with plastic protective sleeve in the laser and is coupled into second from the seed light that oscillator stage is exported by the second fiber coupler (WDM) 19 by the 3rd fiber coupler (WDM) 20 mixes realization amplification ytterbium (Yb) gain fibre 21; seed light energy in transmission course is constantly amplified; pulsewidth also becomes and is beneficial to greatly non-linear broadening, obtains wider spectrum.Light pulse after the amplification enters in the high non-linear photon crystal optical fiber 22, because its solitary wave centre wavelength is positioned at the anomalous dispersion region of photonic crystal fiber, can produce multiple non-linear process.When the input draw power is low, obvious orphan's self-frequency shift effect can occur, the peak appears in the long wave direction, increase along with the input draw power, higher-order soliton splits into several basic orphans, and gradually red shift under the effect of Raman scattering in pulse, be accompanied by the non-orphan's radiation that produces simultaneously blue shift.And then along with power improves, the new frequency content that four wave mixing produces is so that the spectrum trend is smooth and further widened.
For the used high non-linear photon crystal optical fiber of the present invention, its mode field diameter much smaller than with the monomode fiber of its welding, limited coupling efficiency and super continuous spectrums broadening degree.For this problem, will adopt little electric current multiple discharge welding to reduce splice loss, splice attenuation.Experiment is built, and adopts experiment light from the mode of monomode fiber incident, by optimizing the splicing parameters such as discharge parameter, propulsive parameter, side-play amount, and the other end is gone out the luminous power Real-Time Monitoring, to determine relatively low-loss welding mode.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the invention described above embodiment sequence number does not represent the quality of embodiment just to description.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. compact all optical fiber supercontinuum light source, comprising: laser module is characterized in that: described laser module comprises oscillator stage and amplifying stage two parts,
The oscillator stage structure is mixed ytterbium gain fibre (16), the first optical fiber collimator (9), a λ/4 wave plates (10), λ/2 wave plates (11), polarization beam apparatus (12), λ/4 wave plates (13), birefringent filter (14), the second optical fiber collimator (15) and fibre optic isolater (18) for the first pumping source (7), the first fiber coupler (17), first that link to each other successively; The amplifying stage structure is mixed ytterbium gain fibre (21) and high non-linear photon crystal optical fiber (22) for the second pumping source (8), the second fiber coupler (20), second that link to each other successively; Be connected by monomode fiber between each section optical fiber and the above-mentioned device.
2. compact all optical fiber supercontinuum light source according to claim 1 is characterized in that: adopt the 3rd fiber coupler (19) to be coupled between described oscillator stage and the described amplifying stage.
3. compact all optical fiber supercontinuum light source according to claim 1, it is characterized in that: described the first pumping source (7) and the second pumping source (8) are specially: output wavelength is the semiconductor laser of 970nm.
4. compact all optical fiber supercontinuum light source according to claim 1 is characterized in that: be direct welding between described high non-linear photon crystal optical fiber (22) and the monomode fiber, adopt repeatedly low discharging current.
5. compact all optical fiber supercontinuum light source according to claim 1 is characterized in that: also comprise: base (6),
Used each section optical fiber closely is coiled in the magnetic tape type fiber reel that integrates with described base (6) in groove; Described the first fiber coupler (17), described the second fiber coupler (20), described the 3rd fiber coupler (19) and described fibre optic isolater (18) also are arranged on described magnetic tape type fiber reel in groove; Each section outer fiber is wrapped up soft heat-conducting silica gel sheet.
6. compact all optical fiber supercontinuum light source according to claim 5, it is characterized in that: described magnetic tape type fiber reel is provided with transparent plastic cover plate (3) on groove, described transparent plastic cover plate (3) bottom is provided with boss, and described boss matches for fixed fiber around groove with described magnetic tape type fiber reel.
7. compact all optical fiber supercontinuum light source according to claim 1 is characterized in that: also comprise: be equipped with the fixedly workbench of counterbore (4),
Described the first optical fiber collimator (9), a described λ/4 wave plates (10), described λ/2 wave plates (11), described polarization beam apparatus (12), described λ/4 wave plates (13), described birefringent filter (14) and described the second optical fiber collimator (15) are integrated on the described workbench (4).
8. compact all optical fiber supercontinuum light source according to claim 5 is characterized in that: also comprise: is provided with the side panel (2) of U-shaped hole (27), also is provided with the second V-shaped groove (26) on the described base (6),
The passage that pumping input optical fibre and supercontinuum output optical fibre fit in by described the second V-shaped groove (26) on the described U-shaped hole (27) on the described side panel (2) and the described base (6).
9. compact all optical fiber supercontinuum light source according to claim 5 is characterized in that: be provided with free curve fixing hole (25) and free curve hole (5) on the described base (6).
10. compact all optical fiber supercontinuum light source according to claim 5 is characterized in that: also be provided with laser loam cake (1) on the described base (6); Also be provided with the first V-shaped groove (24) on the described base (6), monomode fiber (23) enters described magnetic tape type fiber reel in groove by the guiding of described the first V-shaped groove (24).
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103944042A (en) * | 2014-02-26 | 2014-07-23 | 上海交通大学 | Passive mode-locked fiber laser device |
| CN105896248A (en) * | 2016-05-10 | 2016-08-24 | 西北大学 | High-power tunable 1.7mum mode-locked fiber laser |
| CN104300346B (en) * | 2014-10-14 | 2018-08-31 | 上海理工大学 | picosecond pulse laser oscillator |
| CN109818243A (en) * | 2019-02-22 | 2019-05-28 | 深圳技术大学（筹） | A kind of fiber amplifier |
| CN109921269A (en) * | 2019-03-05 | 2019-06-21 | 深圳市杰普特光电股份有限公司 | Laser |
| CN110998998A (en) * | 2017-06-27 | 2020-04-10 | Smr专利有限公司 | Laser automobile lamp device |
| CN111262118A (en) * | 2020-01-20 | 2020-06-09 | 北京恭科光电科技有限公司 | Device heat radiation structure suitable for near-earth space environment |
| CN112366503A (en) * | 2020-11-09 | 2021-02-12 | 中国工程物理研究院激光聚变研究中心 | Super-continuum spectrum laser output device and system |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103944042A (en) * | 2014-02-26 | 2014-07-23 | 上海交通大学 | Passive mode-locked fiber laser device |
| CN104300346B (en) * | 2014-10-14 | 2018-08-31 | 上海理工大学 | picosecond pulse laser oscillator |
| CN105896248A (en) * | 2016-05-10 | 2016-08-24 | 西北大学 | High-power tunable 1.7mum mode-locked fiber laser |
| CN105896248B (en) * | 2016-05-10 | 2018-11-27 | 西北大学 | A kind of 1.7 μm of mode locked fiber lasers of high power tunable |
| CN110998998A (en) * | 2017-06-27 | 2020-04-10 | Smr专利有限公司 | Laser automobile lamp device |
| CN110998998B (en) * | 2017-06-27 | 2021-08-06 | Smr专利有限公司 | Laser automobile lamp device |
| CN109818243A (en) * | 2019-02-22 | 2019-05-28 | 深圳技术大学（筹） | A kind of fiber amplifier |
| CN109921269A (en) * | 2019-03-05 | 2019-06-21 | 深圳市杰普特光电股份有限公司 | Laser |
| CN111262118A (en) * | 2020-01-20 | 2020-06-09 | 北京恭科光电科技有限公司 | Device heat radiation structure suitable for near-earth space environment |
| CN111262118B (en) * | 2020-01-20 | 2023-08-22 | 北京恭科光电科技有限公司 | Device heat radiation structure suitable for near-earth space environment |
| CN112366503A (en) * | 2020-11-09 | 2021-02-12 | 中国工程物理研究院激光聚变研究中心 | Super-continuum spectrum laser output device and system |
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