CN1750334A - Composite chamber adjustable Raman optical fiber laser - Google Patents
Composite chamber adjustable Raman optical fiber laser Download PDFInfo
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- CN1750334A CN1750334A CN 200510015061 CN200510015061A CN1750334A CN 1750334 A CN1750334 A CN 1750334A CN 200510015061 CN200510015061 CN 200510015061 CN 200510015061 A CN200510015061 A CN 200510015061A CN 1750334 A CN1750334 A CN 1750334A
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Abstract
This invention relates to a fiber laser, the technology of which includes: taking the output light of a large power laser with the central wavelength of 1070nm as the pump light to enter into the cascade structure linear resonate cavity composed of Raman gain fiber and fiber gratings, the energy of which is converted to the long wavelength light steadily via Stokes at different levels to get the necessary output band. In the process of the transformation from the last-but-one level Stokes light to the last, a narrowband tuned filter ring resonate cavity is used to obtain large sphere of laser output at the needed bands under the combined action of wide band gain property of the Si elements in Raman fiber and the narrow band tuning.
Description
Technical field
The present invention relates to a kind of fiber laser, particularly have the adjustable Raman optical fiber laser of Compound Cavity.
Background technology
The method that is used to now to make tunable laser both at home and abroad generally has following several: (1) tunable distributed feedback laser; (2) tunable DBR laser; (3) tunable microelectromechanical-systems vertical cavity surface emitting laser; (4) tunable external cavity formula laser; (5) based on the tunable laser of Er-doped fiber.Wherein method (1) and (2) all are to adopt the method that changes injection current that the refractive index of part material in the laser is regulated, thereby realization is tuning to optical maser wavelength, but adopt this way that the tuning range of laser is very limited, maximum has only about 16nm; Method (3) adopts the method for mobile mirror position to change optical maser wavelength, and tuning range is improved greatly, but need two Bragg mirrors of both sides, quantum well radiation district structure of tens nanometer thickness only arranged usually, complex process, and cost is very high; Method (4) utilizes the optical grating constitution exocoel to carry out the adjusting of laser wavelength, also can improve tuning range, but need bulky mechanical organ and optical element, limited the scope of its application, though the extenal cavity tunable laser device that adopts microelectromechanical-systems to make has reduced volume, but there is complex process equally, the problem that cost is too high; Method (5) is utilized the wideband gain of erbium optical fiber, adds the excitation wavelength that filter element is controlled laser in the loop, and method is simple, good stability, but tuning range is subjected to the restriction (generally about 30nm) of erbium ion gain bandwidth, still is difficult to satisfy the demand.Therefore, all there is defective in this several method, is difficult to satisfy fully actual needs.
Summary of the invention
Purpose of the present invention: with lower cost, simple structure is utilized full optical fibre device, exports at the laser that near infrared any wave band acquisition can be tuning on a large scale.
Technology constitutes: the output light of high power fiber laser that with centre wavelength is 1070nm is as pump light, enter the linear resonant cavity of the cascade structure that constitutes by Raman gain optical fiber and fiber grating, under the effect of Raman scattering effect, the energy of pump light transforms to long wavelength light gradually through stokes waves at different levels (Stokes) light, until arriving required output wave band.By penultimate stage Stokes light in the process of afterbody Stokes phototransformation, employing has the ring resonator of narrow-band tunable filter, in raman optical fibre, under the comprehensive function of the narrow-band tunable of the wideband gain characteristic of element silicon and filter, can obtain tunable laser output on a large scale like this at required wave band.
Concrete technical scheme of the present invention is:
Composite chamber adjustable Raman optical fiber laser, it is made of pump light source and nested type composite resonant cavity two parts; It is characterized in that: the nested type composite resonant cavity comprises nested type cascade linear cavity and wideband adjustable annular chamber; The linear resonant cavity of nested type cascade comprises center how right to the fiber grating that is all-trans as the phosphorus silicon raman optical fibre of gain media and its both sides, and the fiber grating that pump light is all-trans of linear cavity output; Wideband adjustable ring resonator bag wave division multiplex coupler WDM, isolator, filter and coupler, 2 WDM couplers are connected to linear resonant cavity many to be all-trans fiber grating to the outside of the fiber grating that is all-trans, the WDM coupler on right side connects isolator, filter and coupler successively; The pump light of pump light source enters linear resonant cavity through the WDM coupler, under many effects to the fiber grating that is all-trans, energy is transformed into the output wave band step by step by pump light, enter the wideband adjustable annular chamber then, under the frequency-selecting effect of annular chamber median filter, form the single laser of frequency, at last by outside the coupler output cavity.
Beneficial effect of the present invention: this novel tunable laser can near infrared any wave band obtain can be tuning on a large scale high power laser light output, the energy conversion efficiency height, time stability is good, can at room temperature work, temperature stability is good, and fiberize degree height is convenient to integrated, and cost is low, technology is simple, is easy to suitability for industrialized production.The outstanding feature of this tunable laser is exactly, and utilizes the characteristics of the multistage frequency displacement of Raman, can realize the output of high power tunable laser near infrared any wave band; The gain media of laser adopts phosphorus silicon raman optical fibre, has both utilized the big characteristics of P elements Raman shifting, and device architecture is simplified greatly, has reduced cost, has utilized the characteristics of element silicon Raman gain wide ranges again, has improved the tuning range of laser; The resonant cavity of laser adopts the Compound Cavity structure, linear cavity and annular chamber are united use, fully utilized the advantage of two kinds of resonant cavitys, wherein linear cavity can improve the efficient that pump light transforms to long wavelength light, and the design of the needed WDM coupler of annular chamber is simplified greatly, reduce manufacture difficulty, annular chamber then makes the wide characteristics of element silicon gain bandwidth be given full play to, and has expanded the tuning range of laser; In addition, because linear cavity and annular chamber adopt nesting type structure, therefore two resonant cavitys can use same section phosphorus silicon raman optical fibre as gain media jointly, thereby have improved the service efficiency of raman optical fibre greatly, have saved cost; At last, the use of the narrow-band tunable filter in the annular chamber makes the output wavelength of laser adjustable flexibly, guarantees that again laser has narrower live width, makes laser energy more concentrated.So, this be a kind of can be in any wave band work of near-infrared, temperature stability is good, technology is simple, low-cost, high power, can tuning on a large scale fiber laser.
Description of drawings
Figure 11 .55 mu m waveband composite chamber adjustable Raman optical fiber laser structural representation
Fig. 2 element silicon Raman gain spectrum
Among the figure: 3. 3 pairs of fiber gratings that are all-trans of 1.1070nm high-capacity optical fiber laser 2. phosphorus silicon raman optical fibres are right, and wavelength is respectively 1247nm, 1328nm and 1421nm 4. centre wavelengths are the fiber grating 5.1070/1550nmWDM coupler 6. centre wavelength 1550nm isolator 7.1.55 mu m waveband narrow-band tunable filter 8.1550nm fiber directional couplers that are all-trans of 1070nm
Embodiment
Be example with 1.55 mu m waveband composite chamber adjustable Raman optical fiber lasers below, in conjunction with the accompanying drawings concrete scheme of the present invention be elaborated:
Composite chamber adjustable Raman optical fiber laser, it is made of pump light source and nested type composite resonant cavity two parts; Its characteristics are: the nested type composite resonant cavity comprises nested type cascade linear cavity and wideband adjustable annular chamber; The linear resonant cavity of nested type cascade comprises that the center is all-trans fiber grating to 3 as the phosphorus silicon raman optical fibre 2 of gain media and three couple of its both sides, and the fiber grating 4 that pump light is all-trans of linear cavity output; Wideband adjustable ring resonator bag wave division multiplex coupler WDM5, isolator 6, filter 7 and coupler 8,2 WDM couplers are connected to linear resonant cavity many to the fiber grating that is all-trans to 3 and the outside of the fiber grating 4 that is all-trans, the WDM coupler on right side connects isolator, filter and coupler successively; The pump light of pump light source 1 enters linear resonant cavity through WDM coupler 5, under many effects to the fiber grating 3 that is all-trans, energy is transformed into the output wave band step by step by pump light, enter the wideband adjustable annular chamber then, under the frequency-selecting effect of annular chamber median filter 7, form the single laser of frequency, at last by outside coupler 8 output cavities.
Pump light source adopts the superpower laser of optical-fiber type output, and the output wave band is near 1070nm.
Gain media adopts phosphorus silicon raman optical fibre, with the Raman gain of comprehensive utilization P elements and element silicon, reduces the Raman shifting number of times.
Adopt many grating pair nesting formula cascade linear cavity that is all-trans to be converted into the laser energy of output wave band step by step with the energy of pump light, wherein each is to the centre wavelength of the grating pair that the is all-trans wavelength corresponding to stokes wave Stokes ripples at different levels.
The afterbody Raman shifting adopts the Raman shifting of element silicon.
The service band that connects the WDM coupler of annular chamber and linear cavity is pump light wavelength/laser output wave band.
The service band of tunable optic filter in the annular chamber is laser output wave band.
The service band of isolator in the annular chamber is laser output wave band.
Embodiment
1.55 it is the high-capacity optical fiber laser of 1070nm that the pumping source 1 of mu m waveband composite chamber adjustable Raman optical fiber laser adopts output wavelength, gain fibre adopts phosphorus silicon raman optical fibre 2, nested type cascade linear cavity is that the grating 4 of being all-trans of 1070nm constitutes with raman optical fibre by three couple who is symmetrically distributed in raman optical fibre both sides fiber grating that is all-trans to 3, one centre wavelengths.Wherein the centre wavelength of three pairs of grating pairs that are all-trans is respectively 1247nm, 1328nm and 1421nm.The wideband adjustable annular chamber comprises 1070/1550WDM coupler 5,1550nm isolator 6,1.55 mu m waveband narrow-band tunable filters 7,1550nm fiber coupler 8 and raman optical fibre 2.
This tunable laser is the Raman scattering effect of utilizing in the optical fiber, exports at 1.55 mu m wavebands acquisition high power broadband tunable laser.The gain media of tunable laser adopts phosphorus silicon raman optical fibre as gain media, utilized the wherein Raman gain of phosphorus and two kinds of elements of silicon, and wherein the P elements Raman shifting is big, is about 1330cm
-1, can simplify device architecture, improve transformation efficiency, and the element silicon Raman shifting is little, is about 490cm
-1, gain bandwidth is very wide, and about 40THz (as Fig. 2) therefore can improve the flexibility of laser output wavelength, and bigger tuning range is provided, and surpasses 100nm as the gain bandwidth at 1.55 mu m wavebands.After the 1070nm laser of pumping source 1 output enters the cascade linear cavity, under the feedback effect of three pairs of grating pairs that are all-trans, through the Raman scattering of one-level P elements and the Raman scattering of three grades of element silicons in the phosphorus silicon raman optical fibre, its energy is the one-level Stokes ripple of 1247nm, the secondary Stokes ripple of 1328nm and three grades of Stokes ripples of 1421nm via wavelength, finally is converted into the fourth stage Stokes ripple of 1.55 mu m wavebands.Because the reflecting grating of this wave band not in the linear cavity, this grade Stokes ripple enters in the annular chamber.In the process of energy by the Stokes ripple conversion of Stokes wave direction 1.55 mu m wavebands of 1421nm, what utilize is the Raman scattering effect of element silicon in the optical fiber, therefore can be in very wide wavelength band (＞100nm) provide gain, add the adjustable frequency-selecting effect of narrow band filter in the annular chamber, just can in surpassing the scope of 100nm, obtain laser generation by the method for regulating filter.The energy of 1.55 mu m wavebands is coupled to outside the chamber by output coupler in the last annular chamber, forms laser output.
Claims (8)
1. composite chamber adjustable Raman optical fiber laser, it is made of pump light source and nested type composite resonant cavity two parts; It is characterized in that: the nested type composite resonant cavity comprises nested type cascade linear cavity and wideband adjustable annular chamber; The linear resonant cavity of nested type cascade comprise the center as the phosphorus silicon raman optical fibre (2) of gain media and its both sides many to the fiber grating that is all-trans to (3), and the fiber grating (4) that pump light is all-trans of linear cavity output; The wideband adjustable ring resonator comprises wave division multiplex coupler WDM (5), isolator (6), filter (7) and coupler (8), 2 WDM couplers are connected to linear resonant cavity many to the fiber grating that is all-trans to the outside of (3) and the fiber grating that is all-trans (4), the WDM coupler on right side connects isolator, filter and coupler successively; The pump light of pump light source (1) enters linear resonant cavity through WDM coupler (5), under many effects to the fiber grating that is all-trans (3), energy is transformed into the output wave band step by step by pump light, enter the wideband adjustable annular chamber then, under the frequency-selecting effect of annular chamber median filter (7), form the single laser of frequency, at last by outside coupler (8) output cavity.
2. composite chamber adjustable Raman optical fiber laser according to claim 1 is characterized in that: pump light source adopts the superpower laser of optical-fiber type output, and the output wave band is near 1070nm.
3. composite chamber adjustable Raman optical fiber laser according to claim 1 is characterized in that: gain media adopts phosphorus silicon raman optical fibre, with the Raman gain of comprehensive utilization P elements and element silicon, reduces the Raman shifting number of times.
4. composite chamber adjustable Raman optical fiber laser according to claim 1, it is characterized in that: adopt many grating pair nesting formula cascade linear cavity that is all-trans to be converted into the laser energy of output wave band step by step with the energy of pump light, wherein each is to the centre wavelength of the grating pair that the is all-trans wavelength corresponding to stokes wave Stokes ripples at different levels.
5. composite chamber adjustable Raman optical fiber laser according to claim 1 is characterized in that: the afterbody Raman shifting adopts the Raman shifting of element silicon.
6. composite chamber adjustable Raman optical fiber laser according to claim 1 is characterized in that: connect the service band of the WDM coupler of annular chamber and linear cavity, be pump light wavelength/laser output wave band.
7. composite chamber adjustable Raman optical fiber laser according to claim 1 is characterized in that: the service band of tunable optic filter in the annular chamber is laser output wave band.
8. composite chamber adjustable Raman optical fiber laser according to claim 1 is characterized in that: the service band of isolator in the annular chamber is laser output wave band.
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| CN 200510015061 CN1750334A (en) | 2005-09-09 | 2005-09-09 | Composite chamber adjustable Raman optical fiber laser |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100410799C (en) * | 2006-07-17 | 2008-08-13 | 武汉光迅科技股份有限公司 | Efficient circulating filling-in clad pumping optical fiber amplifier |
| CN101191972B (en) * | 2006-12-01 | 2010-09-08 | 中国科学院半导体研究所 | Tunable single-frequency erbium-doped optical fibre ring form cavity laser with stable output wavelength and power |
| CN101169324B (en) * | 2006-10-23 | 2010-09-29 | 北京理工大学 | Photon infusion saturated absorption mode-locking type optical fiber laser peg-top |
| CN102170082A (en) * | 2011-03-29 | 2011-08-31 | 东南大学 | All-fiber pulsed fiber laser with composite chamber |
| CN107248692A (en) * | 2017-05-19 | 2017-10-13 | 武汉理工大学 | A kind of compound cavity optical fibre laser of super-narrow line width Wavelength tunable |
| CN110579269A (en) * | 2019-08-14 | 2019-12-17 | 中国地震局地壳应力研究所 | infrasonic wave sensor for rarefied atmosphere space and sound detection load cabin |
| CN112397978A (en) * | 2019-08-15 | 2021-02-23 | 中国科学院大连化学物理研究所 | Optical fiber Raman laser of alkali metal laser pump |
-
2005
- 2005-09-09 CN CN 200510015061 patent/CN1750334A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100410799C (en) * | 2006-07-17 | 2008-08-13 | 武汉光迅科技股份有限公司 | Efficient circulating filling-in clad pumping optical fiber amplifier |
| CN101169324B (en) * | 2006-10-23 | 2010-09-29 | 北京理工大学 | Photon infusion saturated absorption mode-locking type optical fiber laser peg-top |
| CN101191972B (en) * | 2006-12-01 | 2010-09-08 | 中国科学院半导体研究所 | Tunable single-frequency erbium-doped optical fibre ring form cavity laser with stable output wavelength and power |
| CN102170082A (en) * | 2011-03-29 | 2011-08-31 | 东南大学 | All-fiber pulsed fiber laser with composite chamber |
| CN102170082B (en) * | 2011-03-29 | 2012-07-18 | 东南大学 | All-fiber pulsed fiber laser with composite chamber |
| CN107248692A (en) * | 2017-05-19 | 2017-10-13 | 武汉理工大学 | A kind of compound cavity optical fibre laser of super-narrow line width Wavelength tunable |
| CN107248692B (en) * | 2017-05-19 | 2020-01-14 | 武汉理工大学 | Ultra-narrow linewidth wavelength-adjustable composite cavity optical fiber laser |
| CN110579269A (en) * | 2019-08-14 | 2019-12-17 | 中国地震局地壳应力研究所 | infrasonic wave sensor for rarefied atmosphere space and sound detection load cabin |
| CN110579269B (en) * | 2019-08-14 | 2022-05-31 | 中国地震局地壳应力研究所 | Infrasonic wave sensor for rarefied atmosphere space and sound detection load cabin |
| CN112397978A (en) * | 2019-08-15 | 2021-02-23 | 中国科学院大连化学物理研究所 | Optical fiber Raman laser of alkali metal laser pump |
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