CN105406333B - The 1.7 mu m waveband tunable Raman fiber lasers based on ASE pumping - Google Patents
The 1.7 mu m waveband tunable Raman fiber lasers based on ASE pumping Download PDFInfo
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- CN105406333B CN105406333B CN201510975935.6A CN201510975935A CN105406333B CN 105406333 B CN105406333 B CN 105406333B CN 201510975935 A CN201510975935 A CN 201510975935A CN 105406333 B CN105406333 B CN 105406333B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/0915—Processes or apparatus for excitation, e.g. pumping using optical pumping by incoherent light
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
- H01S3/302—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects in an optical fibre
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- Optics & Photonics (AREA)
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The 1.7 mu m waveband tunable Raman fiber lasers based on ASE pumping, belong to field of lasers, aiming at the problem that prior art assembly is complicated, environmental stability is poor, gain is not high and the practicability is poor, successively optical fiber connects for ASE light source, tunable optic filter and erbium-doped fiber amplifier, the connection of the port a optical fiber of erbium-doped fiber amplifier output end and fiber optical circulator, successively optical fiber connects with port k by port b, highly nonlinear optical fiber, dispersion shifted optical fiber and the fibre optic isolater port l of fiber optical circulator；The connection of the i fiber port of fibre optic isolater port k and 1 × 2 fiber coupler, the port j of 1 × 2 fiber coupler is as output；Successively optical fiber connects with the port c of fiber optical circulator for the port h of 1 × 2 fiber coupler, the port g of fiber coupler, the port d of fiber coupler, erbium-doped single-mode fiber；Successively optical fiber connects port e, polarization-maintaining single-mode fiber, the Polarization Controller of fiber coupler with the port f of fiber coupler.
Description
Technical field
The present invention relates to a kind of tunable Raman light sources of 1.7 mu m wavebands, belong to field of laser device technology, are applied to biology
Medicine light source field.
Background technique
Optical coherence tomography OCT is a kind of undamaged optical imaging method, is capable of providing real-time one-dimensional depth, two dimension
Cross section and three-dimensional body image, resolution ratio have millimeter magnitude up to micron dimension, imaging depth.According to the characteristic of OCT, it
It is widely used biologic medical field, including needing the eye of clearly three-dimensional retinal images to detect, heart
Lesion detection, early diagnosis of tumor, the inspection of tooth, skin detection etc..OCT technology is also applied to non-medical field by more and more
It closes, such as the identification and protection of the art work, industrial metrology etc..
OCT system for retina image-forming is all base and 800nm and 1050nm.The OCT of 1300nm is also used for obtaining
Optical biopsy without cutting tissue is imaged.The system major limitation imaging depth of OCT is the scattering of laser in biological tissues.
And the light of short wavelength limits the imaging depth of OCT in biological tissues by strong scattering loss.It is apparent from light in the medium
Rayleigh scattering system used leaves much room on depend on light wavelength.As wavelength increases, Rayleigh scattering effect is smaller, to know
Using the light source of long wavelength Rayleigh scattering loss of the light in tissue can be reduced, the projection depth of light can be increased
As depth.In the sub- absorption spectra of body water and scattering spectra, 1450nm and 1900nm are nearby the strong absorption peak of two water.And
1700nm is nearby the low ebb between two water absorption peaks, so 1700nm wave band 1650nm-1750nm light source is directed to containing a large amount of
For the biological tissue of water, while reducing scattering loss, not increasing absorption loss, the deeper imaging for increasing OCT is deep
Degree.Existing Ramar laser focuses mostly in 1550nm wave band, and 1700nm wave band Ramar laser does not have substantially.
Chinese patent is entitled " 1.75 μm of narrow linewidth thulium-doped fiber lasers ", and application No. is " 201520447957 ", should
Light-source structure is as shown in Figure 1,1550nm wave band optical fiber laser transmitting laser by positive lens and is coupled to single mode with spectroscope
In optical fiber and thulium doped fiber, then it is collimated on body grating VBG and carries out by positive lens after pumping thulium doped fiber generation gain spectral
Filtering, filtered light export 1700nm wave band of laser after multiple oscillation.
The device has the following defects：
1, using more space optical element such as body grating, it is intracavitary there are space optical coupling to single mode optical fiber structure and
Magnetism servo-electric motor water-cooling, so device assembly is complicated and environmental stability is poor.
2,1.7 mu m wavebands are in the edge of thulium doped fiber wideband gain spectrum, and gain is not high.
3, the laser can only realize that Single wavelength exports, and practical application is restricted.
4, the body grating VBG of price costly has been used, cost is increased.
Summary of the invention
The present invention is that the existing 1.7 mu m waveband optical fiber laser assembly of solution is complicated, environmental stability is poor, gain is not high
With the problem of the practicability is poor, good a kind of suitable all -fiber, stability, high gain and 1.7 practical mu m waveband light are proposed
Fibre laser.
The present invention takes following technical scheme：
The 1.7 mu m waveband tunable Raman fiber lasers based on ASE pumping, characterized in that
Successively optical fiber connects for ASE light source, tunable optic filter and erbium-doped fiber amplifier, erbium-doped fiber amplifier output end
It is connect with the port a optical fiber of fiber optical circulator, port b, highly nonlinear optical fiber, dispersion shifted optical fiber and the optical fiber of fiber optical circulator
Successively optical fiber connects isolator port l with port k；The i fiber port of fibre optic isolater port k and 1 × 2 fiber coupler connects
It connects, the port j of 1 × 2 fiber coupler is as output；The port h of 1 × 2 fiber coupler, fiber coupler port g, optical fiber
Successively optical fiber connects port d, the erbium-doped single-mode fiber of coupler with the port c of fiber optical circulator；The port e of fiber coupler,
Successively optical fiber connects by polarization-maintaining single-mode fiber, Polarization Controller and the port f of fiber coupler.
The beneficial effects of the invention are as follows：The present invention uses all-fiber devices, and optical fiber laser assembly is simple, compact-sized,
Environmental stability is good；The Raman spectrum generated using the pumping of 1550nm wave band, by adjusting tunable optic filter adjustable gain spectrum
Shape, to realize the central wavelength of spectrum in 1700nm wave band, gain spectral high gain；Using fiber comb filter, realize single
Dual wavelength gear shift, tunable wave length is practical, and at low cost.
1.7 mu m waveband optical fiber lasers of the invention have a wide range of applications in fields such as biological therapy, mid-infrared laser devices
Prospect, especially optical coherent chromatographic imaging have huge applications potentiality.
Detailed description of the invention
Fig. 1 is the optical fiber laser of existing 1.7 mu m waveband.
Fig. 2 is that the present invention is based on the 1.7 mu m waveband tunable Raman fiber lasers that ASE is pumped.
Fig. 3 is that the present invention is based on the tunable models of Single wavelength of the ASE 1.7 mu m waveband tunable Raman fiber lasers pumped
It encloses.
Fig. 4 is that the present invention is based on the wavelength and power stability of the ASE 1.7 mu m waveband tunable Raman fiber lasers pumped
Property.
Fig. 5 is that the present invention is based on the line widths of the ASE 1.7 mu m waveband tunable Raman fiber lasers pumped.
Fig. 6 is that the present invention is based on the ASE 1.7 mu m waveband tunable Raman fiber laser twin wavelength laser outputs pumped and power
Stability.
Fig. 7 is that the present invention is based on the 1.7 mu m waveband tunable Raman fiber laser dual wavelength tuning performances that ASE is pumped.
Specific embodiment
It elaborates with reference to the accompanying drawing to the present invention.
As shown in Figure 1, the present invention is based on 1.7 mu m waveband tunable Raman fiber lasers of ASE pumping, including with lower part
Part：ASE light source 10, tunable optic filter 11, erbium-doped fiber amplifier 12, fiber optical circulator 13, highly nonlinear optical fiber 14, dispersion
Shifted fiber 15,16,1 × 2 fiber coupler 17 of fibre optic isolater, polarization-maintaining single-mode fiber 18, Polarization Controller 19,2 × 2 3dB
Fiber coupler 20 and erbium-doped single-mode fiber 21.
Successively optical fiber connects for ASE light source 10, tunable optic filter 11 and erbium-doped fiber amplifier 12, erbium-doped fiber amplifier
12 output ends are connect with the port a optical fiber of fiber optical circulator 13, port b, the highly nonlinear optical fiber 14, dispersion of fiber optical circulator 13
Successively optical fiber connects with port k by shifted fiber 15 and 16 port l of fibre optic isolater；16 port k of fibre optic isolater and 1 × 2 optical fiber
The i fiber port of coupler 17 connects, and the port j of 1 × 2 fiber coupler 17 is as output；The end h of 1 × 2 fiber coupler 17
The end c of mouth, the port g of fiber coupler 20, the port d of fiber coupler 20, erbium-doped single-mode fiber 21 and fiber optical circulator 13
Successively optical fiber connects mouth；Port e, polarization-maintaining single-mode fiber 18, Polarization Controller 19 and the fiber coupler 20 of fiber coupler 20
Port f successively optical fiber connect.
The ASE light source 10 is the light source of 1550nm wave band planarization, and optical power is consistent under different wave length, and output waveband is
1525nm-1580nm。
11 tunable range of tunable optic filter is 1525nm-1607nm, bandwidth 1nm, for adjusting different pumpings
Wavelength changes intracavitary different dispersion area, to carry out shaping to gain spectral.
12 output power of erbium-doped fiber amplifier is 37dBm.
14 length of highly nonlinear optical fiber is 500m.
15 length of dispersion shifted optical fiber is 10km, for providing Raman gain.
The fiber optical circulator 13 and fibre optic isolater 16 are resistance to high-power component.
The fiber coupler 17, port j are 20% power output, and port i is 80% output.
The fiber coupler 20, polarization maintaining optical fibre 18 and Polarization Controller 19 are combined into comb filter.
The fiber coupler 20 is 2 × 2 3dB fiber couplers.
Based on 1.7 mu m waveband tunable Raman fiber lasers of ASE pumping, the course of work is as follows：
ASE light source 10 emits broadband spectral and forms narrow-band spectrum after the filtering of tunable optic filter 11.Narrow-band spectrum warp
Cross 13 port a of injection fibre circulator after erbium-doped fiber amplifier 12 amplifies.Narrow-band spectrum is via fiber optical circulator 13 after amplification
It is exported after port a to port b.Narrow-band spectrum is generated after highly nonlinear optical fiber 14 and dispersion shifted optical fiber 15 backwards to Raman
Spectrum.Enter 13 port b of fiber optical circulator backwards to Raman spectrum back, and enters er-doped single mode from 13 port c of fiber optical circulator output
Optical fiber 21.Erbium-doped single-mode fiber 21 absorbs 1550nm band part to backwards to Raman spectrum, and then generating central wavelength is 1700nm
The Raman of wave band is composed.Raman spectrum after absorption is by by fiber coupler 20, polarization-maintaining single-mode fiber 18 and Polarization Controller 19
The comb filter filtering being combined into.Filtered Raman composes the end h, the end i, Fiber isolation via 1 × 2 fiber coupler 17
Device 16, dispersion shifted optical fiber 15 and highly nonlinear optical fiber 14 enter the port b of fiber optical circulator 13, follow so as to complete primary light
Ring.By repeatedly recycling and gain, when filtered Raman spectrum reaches laser threshold, in intracavitary formation laser, and from 1 × 2
The end j of fiber coupler 17 exports.By adjusting Polarization Controller 19 and tunable optic filter 11, it can be achieved that tunable wave length.
The output power of erbium-doped fiber amplifier 12 is adjusted, can control output wavelength number.
As shown in figure 3, it is special that intracavitary filtering is adjusted by Polarization Controller 19 and tunable optic filter 11 in adjusting cavity
Property, realize the tunable 33.4nm of Single wavelength laser, i.e. 1652.77-1686.2nm of 1700nm wave band.
As shown in figure 4, being optical maser wavelength and power stability, wavelength stability is less than 0.02nm, and power stability is less than
±1dB。
As shown in figure 5, being less than 0.08nm for Single wavelength laser linewidth.
As shown in fig. 6, by the output power of raising erbium-doped fiber amplifier 12, it can be achieved that twin wavelength laser output, dual wavelength
Power stability is less than ± 2dB.
As shown in fig. 7, dual-wavelength tunable, dual wavelength can also be realized by adjusting Polarization Controller 19 and tunable optic filter 11
Between be divided into 13.4nm, dual-wavelength tunable range is 9.72nm.
If further increasing the output power of erbium-doped fiber amplifier 12, it will realize three wavelength or even more multi-wavelength be defeated
Out.
Claims (10)
1. the 1.7 mu m waveband tunable Raman fiber lasers based on ASE pumping, characterized in that
Successively optical fiber connects for ASE light source (10), tunable optic filter (11) and erbium-doped fiber amplifier (12), Erbium-doped fiber amplifier
Device (12) output end is connect with the port a optical fiber of fiber optical circulator (13), port b, the high non-linearity light of fiber optical circulator (13)
Successively optical fiber connects with port k by fine (14), dispersion shifted optical fiber (15) and fibre optic isolater (16) port l；Fibre optic isolater
(16) the i fiber port of port k and 1 × 2 fiber coupler (17) connects, and the port j of 1 × 2 fiber coupler (17) is as defeated
Out；The port h of 1 × 2 fiber coupler (17), the port g of fiber coupler (20), the port d of fiber coupler (20), er-doped
Successively optical fiber connects single mode optical fiber (21) with the port c of fiber optical circulator (13)；Port e, the polarization-maintaining list of fiber coupler (20)
Successively optical fiber connects by mode fiber (18), Polarization Controller (19) and the port f of fiber coupler (20).
2. the 1.7 mu m waveband tunable Raman fiber lasers according to claim 1 based on ASE pumping, feature exist
In the ASE light source (10) is the light source of 1550nm wave band planarization, and optical power is consistent under different wave length, and output waveband is
1525-1580nm。
3. the 1.7 mu m waveband tunable Raman fiber lasers according to claim 1 based on ASE pumping, feature exist
In tunable optic filter (11) tunable range is 1525-1607nm, bandwidth 1nm, for adjusting different pumping wavelengths
Change intracavitary different dispersion areas, to carry out shaping to gain spectral.
4. the 1.7 mu m waveband tunable Raman fiber lasers according to claim 1 based on ASE pumping, feature exist
In erbium-doped fiber amplifier (12) output power is 37dBm.
5. the 1.7 mu m waveband tunable Raman fiber lasers according to claim 1 based on ASE pumping, feature exist
In highly nonlinear optical fiber (14) length is 500m.
6. the 1.7 mu m waveband tunable Raman fiber lasers according to claim 1 based on ASE pumping, feature exist
In dispersion shifted optical fiber (15) length is 10km, for providing Raman gain.
7. the 1.7 mu m waveband tunable Raman fiber lasers according to claim 1 based on ASE pumping, feature exist
In the fiber optical circulator (13) and fibre optic isolater (16) are resistance to high-power component.
8. the 1.7 mu m waveband tunable Raman fiber lasers according to claim 1 based on ASE pumping, feature exist
In 1 × 2 fiber coupler (17), port j is 20% power output, and port i is 80% output.
9. the 1.7 mu m waveband tunable Raman fiber lasers according to claim 1 based on ASE pumping, feature exist
In the fiber coupler (20), polarization maintaining optical fibre (18) and Polarization Controller (19) are combined into comb filter.
10. the 1.7 mu m waveband tunable Raman fiber lasers according to claim 1 based on ASE pumping, feature exist
In the fiber coupler (20) is 2 × 2 3dB fiber couplers.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018217171A1 (en) * | 2017-05-25 | 2018-11-29 | National University Of Singapore | Apparatus, optical probe and method for in vivo characterisation of a tissue |
| CN111129937A (en) * | 2019-12-25 | 2020-05-08 | 山东省科学院激光研究所 | Narrow-band picosecond mode-locked fiber laser |
| CN112636138A (en) * | 2020-11-30 | 2021-04-09 | 湖北久之洋红外系统股份有限公司 | Dual-wavelength fiber laser |
Citations (3)
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|---|---|---|---|---|
| CN101483306A (en) * | 2009-01-20 | 2009-07-15 | 天津大学 | C+L band multiple wavelength optical fiber laser |
| CN204315907U (en) * | 2014-12-23 | 2015-05-06 | 北京交通大学 | A kind of multi-wavelength optical fiber laser of tunable wave length |
| CN204793601U (en) * | 2015-06-25 | 2015-11-18 | 中国科学院西安光学精密机械研究所 | 1.75 mu m narrow linewidth thulium-doped optical fiber laser |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100957133B1 (en) * | 2007-12-11 | 2010-05-11 | 한국과학기술연구원 | Multiwavelength fiber laser apparatus including coupled cavities and oscillation method of multiwavelength laser |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101483306A (en) * | 2009-01-20 | 2009-07-15 | 天津大学 | C+L band multiple wavelength optical fiber laser |
| CN204315907U (en) * | 2014-12-23 | 2015-05-06 | 北京交通大学 | A kind of multi-wavelength optical fiber laser of tunable wave length |
| CN204793601U (en) * | 2015-06-25 | 2015-11-18 | 中国科学院西安光学精密机械研究所 | 1.75 mu m narrow linewidth thulium-doped optical fiber laser |
Non-Patent Citations (2)
| Title |
|---|
| Development of a high power supercontinuum source in the 1.7μm wavelength region for highly penetrative ultrahigh-resolution optical coherence tomography;H.Kawagoe et al.;《Biomedical Optics Express》;20140331;第5卷(第3期);第932-943页 * |
| Long-wavelength optical coherence tomography at 1.7μm for enhanced imaging depth;Utkarsh Sharma et al.;《Optics Express》;20081124;第16卷(第24期);第19712-19723页 * |
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