CN104218437A - High-stability linear cavity sweep frequency laser light source - Google Patents
High-stability linear cavity sweep frequency laser light source Download PDFInfo
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- CN104218437A CN104218437A CN201310204509.3A CN201310204509A CN104218437A CN 104218437 A CN104218437 A CN 104218437A CN 201310204509 A CN201310204509 A CN 201310204509A CN 104218437 A CN104218437 A CN 104218437A
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Abstract
The invention relates to a high-stability linear cavity sweep frequency laser light source which comprises a light wave filter, a semiconductor optical amplifier, a half-reflecting mirror, an optical coupler, an optical reflection surface, a polarization maintaining optical fiber and a single mode optical fiber, wherein the light wave filter is tuned to different wavelength positions according to a system requirement and provides a tunable laser wavelength output for a laser, the semiconductor optical amplifier is used for amplifying the generated laser wavelength, the polarization maintaining optical fiber is used for guaranteeing the polarization of laser, the optical coupler is used for coupling output laser into the single mode optical fiber from the polarization maintaining optical fiber, the single mode optical fiber is used for introducing the output laser into the optical reflection surface, a birefrigent effect disappears, and stable output of the laser is ensured, and the optical reflection surface is used for coupling the laser and outputting the laser out of a cavity. With the adoption of the structure, and a linear cavity frequency domain mode-locked laser is achieved and can be used as a high-efficiency laser light source for fields such as imaging, detection and communication.
Description
Technical field:
The invention belongs to field of photoelectric technology, relate to a kind of infrared laser, particularly a kind of scan laser light source as optical coherence tomography system (OCT).It has frequency scanning wide ranges, and speed is fast, the feature that coherence property is good and power stability is high.
Background technology:
Efficient imaging system real-time and high-resolution require to have determined that the coherence of laser is can not ether low.But the laser of developing for OCT that is known as in the market all only has limited coherence length.Its reason is the stability that laser inner high speed scanning filter has destroyed laser.Unique solution is exactly mode-locking technique in frequency domain.This class laser in bibliographical information is all again annular chamber, and the long monomode fiber of upper kilometer may long-time steady operation.
Be the basic structure of current OCT laser as shown in Figure 1, wherein high-speed scan light filter has had a strong impact on the steady running of laser.Adopt scan light filter, only need be tuned to different wave length position just can provide tunable light source for fiber laser.In resonant cavity, the optical wavelength that gain media produces forms standing wave in chamber, and lightwave filter is used for carrying out wavelength selection, and the light wave choosing is amplified rear output by semiconductor optical amplifier.But the insertion loss of optical filter and crosstalking property have affected the stability of Optical Maser System, especially high-speed scan light filter has had a strong impact on the steady running of Optical Maser System especially.
It shown in Fig. 2, is the laboratory OCT Optical Maser System schematic diagram of report.Owing to adopting a number kilometer long monomode fiber, photon time of one week in loop laser chamber is the same with the filter cycle.Therefore, light signal obtains repeating amplifying, and has good coherence.But due to temperature and the environmental perturbation of monomode fiber, laser frequency and power stability still cannot ensure.
Summary of the invention:
In view of the above-mentioned problems in the prior art, the invention provides high stability frequency domain mode-locked laser, comprise lightwave filter, semiconductor optical amplifier, polarization maintaining optical fibre, optical coupler, monomode fiber, optical reflection face.
Described lightwave filter according to system requirements be tuned to different wavelength location, for laser provides the output of tunable optical maser wavelength.
The stimulated radiation effect that described semiconductor optical amplifier produces by the activated material distributing in particle beams reversion, amplifies rear output to produced optical maser wavelength.
Described polarization maintaining optical fibre ensures the polarizability of laser, forms guarantor's polarisation part of laser cavity inside, and the efficient and stability of polarization maintaining optical fibre is significant for the stability of Optical Maser System.
Described optical coupler is coupled into monomode fiber by Output of laser from polarization maintaining optical fibre.
Output of laser is guided to optical reflection face by described monomode fiber, and what form laser cavity inside does not protect polarisation part, and birefringence effect disappears, and has ensured the stable output of laser.
Described optical reflection face exports laser coupled outside chamber to.
The thinking the present invention relates to is a kind of brand-new laser design, and the time that requires fiber lengths to be designed in line style optical cavity to come and go one week equals the filter cycle.Owing to having selected two kinds of different optical fiber, laser cavity is divided into guarantor partially and does not protect inclined to one side two parts, fiber lengths shortens half.Because this structure has been avoided the birefringence effect of monomode fiber, thus when photon when in chamber, the time of round trip equals the optical filter cycle laser enter frequency domain mode-lock status, compact conformation reliability is high, has ensured the stable output of laser.The present invention, aspect stability and coherence, is compared with prior art significantly increased.
Brief description of the drawings:
Fig. 1 is the basic block diagram of sweeping laser device;
Fig. 2 is the structure of sweeping laser device in prior art;
Fig. 3 is the sweeping laser device structure of the embodiment of the present invention;
Fig. 4 is the sweeping laser device frequency sweep spectrum test figure of the embodiment of the present invention;
Fig. 5 is the coherence length resolution chart in frequency domain of the embodiment of the present invention;
Embodiment:
Sweeping laser device provided by the invention, as shown in Figure 3, this laser comprises lightwave filter, semiconductor optical amplifier, polarization maintaining optical fibre, optical coupler, monomode fiber, optical reflection face.
In the present embodiment, described lightwave filter has adopted the bandwidth tunable optical wave filter that wavelength tuning range is 850～1976nm, this tunable reference filter is wide, insertion loss is little, it is little to crosstalk, tuned speed is fast, by the tunning effect of optical filter, realize the frequency sweep of the efficient fast and stable of laser.
It is 1300nm that described semiconductor optical amplifier adopts centre wavelength, and the polarization of least gain 30dB helps semi-conductor optical amplifier.
Described polarization maintaining optical fibre operation wavelength 1270nm-1625,9.5 microns of mode field diameters, form the guarantor's polarisation part in laser cavity.
Described optical coupler connects the guarantor's polarisation in laser cavity and does not protect polarisation part, forms linear cavity.
Described monomode fiber operation wavelength 1260nm-1620nm, 9.2 microns of mode field diameters.
Described optical reflection face is coupled to shoot laser outside chamber.
In the present embodiment, as shown in Figure 4 and Figure 5, frequency sweep spectral centroid position is positioned at 1315nm place for the frequency sweep spectrum that experiment records and coherence length information, and adjustable extent is 110nm; The coherence length 6mm measuring in frequency domain.
Above-described embodiment is to illustrate the invention and not to limit the present invention.
Claims (3)
1. high stability linear cavity frequency-sweeping laser source, comprises lightwave filter, semiconductor optical amplifier, half-reflecting mirror, optical coupler, optical reflection face, polarization maintaining optical fibre, monomode fiber; It is characterized in that the optical maser wavelength that optical filter is selected passes through semiconductor optical amplifier, polarization maintaining optical fibre, optical coupler, monomode fiber successively, finally by optical reflection face by Laser output to chamber, realized linear cavity structure.
2. detector according to claim 1, is characterized in that selecting two kinds of different optical fiber, laser cavity is divided into guarantor partially and does not protect inclined to one side two parts, and compact conformation reliability is high, forms monomode fiber linear cavity structure.
3. LASER Light Source according to claim 1 and 2, fiber lengths shortens half, overcome the unsteadiness of ring cavity structure, avoided the birefringence effect of monomode fiber simultaneously, thereby when photon when in chamber, the time of round trip equals the optical filter cycle laser enter frequency domain mode-lock status, realized stabilized lasers output.
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| CN201310204509.3A CN104218437A (en) | 2013-05-29 | 2013-05-29 | High-stability linear cavity sweep frequency laser light source |
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| CN201310204509.3A CN104218437A (en) | 2013-05-29 | 2013-05-29 | High-stability linear cavity sweep frequency laser light source |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106785860A (en) * | 2016-12-09 | 2017-05-31 | 清华大学 | Self-stabilising frequency domain mode-locked laser based on frequency self-reaction |
| WO2018072295A1 (en) * | 2016-10-21 | 2018-04-26 | 华南理工大学 | Multi-wavelength narrow-linewidth single-frequency optical fiber laser source for laser radar system |
| CN112704470A (en) * | 2020-12-22 | 2021-04-27 | 电子科技大学 | Spectrum-splitting frequency domain coherence tomography system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110069722A1 (en) * | 2009-09-23 | 2011-03-24 | Lobo Ribeiro Antonio B | Swept fiber laser source for optical coherence tomography |
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2013
- 2013-05-29 CN CN201310204509.3A patent/CN104218437A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110069722A1 (en) * | 2009-09-23 | 2011-03-24 | Lobo Ribeiro Antonio B | Swept fiber laser source for optical coherence tomography |
Non-Patent Citations (5)
| Title |
|---|
| CHRISTOPH M. EIGENWILLIG ET AL.: "K-space linear Fourier domain mode locked laser and applications for optical coherence tomography", 《OPTICS EXPRESS》 * |
| H. LIM ET AL.: "High-speed imaging of human retina in vivo with swept-source optical coherence tomography", 《OPTICS EXPRESS》 * |
| MARCO BONESI ET AL.: "High-speed polarization sensitive optical coherence tomography scan engine based on Fourier domain mode locked laser", 《BIOMEDICAL OPTICS EXPRESS》 * |
| S. M. REZA MOTAGHIANNEZAM ET AL.: "Differential phase-contrast, swept-source optical coherence tomography at 1060 nm for in vivo human retinal and choroidal vasculature visualization", 《JOURNAL OF BIOMEDICAL OPTICS》 * |
| 孟卓 等: "全光纤口腔OCT系统偏振波动自动消除方法研究", 《光电子 激光》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018072295A1 (en) * | 2016-10-21 | 2018-04-26 | 华南理工大学 | Multi-wavelength narrow-linewidth single-frequency optical fiber laser source for laser radar system |
| US10693274B2 (en) | 2016-10-21 | 2020-06-23 | South China University Of Technology | Multi-wavelength narrow-linewidth single-frequency optical fiber laser source for laser radar system |
| CN106785860A (en) * | 2016-12-09 | 2017-05-31 | 清华大学 | Self-stabilising frequency domain mode-locked laser based on frequency self-reaction |
| CN112704470A (en) * | 2020-12-22 | 2021-04-27 | 电子科技大学 | Spectrum-splitting frequency domain coherence tomography system |
| CN112704470B (en) * | 2020-12-22 | 2022-03-15 | 电子科技大学 | Spectrum-splitting frequency domain coherence tomography system |
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