CN201181809Y - Wide tunable self-start-oscillation passive mode-locking erbium-doped optical fiber laser - Google Patents
Wide tunable self-start-oscillation passive mode-locking erbium-doped optical fiber laser Download PDFInfo
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- CN201181809Y CN201181809Y CNU200820073835XU CN200820073835U CN201181809Y CN 201181809 Y CN201181809 Y CN 201181809Y CN U200820073835X U CNU200820073835X U CN U200820073835XU CN 200820073835 U CN200820073835 U CN 200820073835U CN 201181809 Y CN201181809 Y CN 201181809Y
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Abstract
The utility model relates to the field of optical fiber lasers, in particular to a widely tunable self-starting passively mode-locked erbium-doped fiber laser. To provide a widely tunable self-starting passively mode-locked erbium-doped fiber laser, so that a tunable filter forcibly filters the ps magnitude mode-locked pulse with large chirp and wide frequency spectrum output by the passively mode-locked erbium-doped fiber laser and continuously tunes the output wavelength within quite a wide range, the technical proposal adopted is as follows: the widely tunable self-starting passively mode-locked erbium-doped fiber laser comprises a wavelength division multiplexer 1, an optical fiber polarization controller 2, a polarizer 3, another optical fiber polarization controller 4, an output coupler 5, an isolator 6, high-doping concentration erbium-doped optical fiber 7 and a tunable filer 8; a laser cavity of the circular cavity passively mode-locked erbium-doped fiber laser is constructed with the non-linear polarization rotation reaction, and the tunable fiber is added to the output end of the laser cavity. The utility model is mainly applied in the manufacturing of erbium-doped fiber lasers.
Description
Technical field
The utility model relates to the fiber laser field, and especially wide tunable is from starting of oscillation passive mode locking erbium doped fiber laser.
Background technology
That the passive mode locking erbium doped fiber laser can produce is stable, the ultrashort light pulse of low noise and low time jitter, high-peak power.Mainly realize the passive mode locking of erbium doped fiber laser at present with two kinds of methods: a kind of method is to utilize semiconductor saturable absorber to realize passive mode locking, although this method can realize self-starting with comparalive ease, but the pulse duration that this method produces is than broad, and destroyed all optical fibre structure of laser; Another kind method is to utilize the nonlinear effect of optical fiber that light pulse is produced from amplitude modulation(PAM), forms the saturable absorber of equivalence in laser cavity, can obtain the subpicosecond short pulse in this way.Utilize the passive mode-locking fiber laser of nonlinear polarization rotation effect work to be proved to be the easiest and effective so far ultra-short pulse source.Owing to need the ps light source of wide tunable in a large amount of application, therefore tunable in recent years passive mode-locking fiber laser enjoys attention.
Tunable passive mode-locking fiber laser plays an important role in a lot of application such as the nonlinear effect of research in the optical fiber, ultrafast spectroscopy, multiphoton microscope, Fibre Optical Sensor, fiber amplifier measurement.
In tunable optical fiber laser, tunable optic filter is a key element, can use F-P filter, fiber grating, fiber loop mirror etc.Usually used tunable optical fiber laser is based on the gain bandwidth of Er-doped fiber 80nm, adds the excitation wavelength that filter element is controlled fiber laser in the loop, realizes the tuning of wavelength.But for the passive mode-locking fiber laser that utilizes the work of nonlinear polarization rotation effect, in laser chamber, add tunable optic filter, after realizing the laser locked mode, when regulating filter, changed the inner parameter of fiber laser, thereby influenced the nonlinear effect in the chamber, made mode-lock status be difficult to keep, and tunable optic filter has increased the insertion loss in the chamber, has influenced the performance of passive mode-locking fiber laser.
Summary of the invention
For overcoming the deficiencies in the prior art, the purpose of this utility model provides a kind of wide tunable from starting of oscillation passive mode locking erbium doped fiber laser, make tunable optic filter not influence the internal structure of passive mode-locking fiber laser, and it is easy to operate, and make tunable optic filter big to warbling of passive mode-locking fiber laser output, the wide ps magnitude mode locking pulse of frequency spectrum is forced filtering, can obtain the ps magnitude short pulse of nearly conversion limit, but also can in the scope of broad, realize the continuously adjustable of output wavelength, and can change at any time and satisfy the demand according to actual needs.
The technical solution adopted in the utility model is, a kind of wide tunable is from starting of oscillation passive mode locking erbium doped fiber laser, comprise: wavelength division multiplexer 1, optical fiber polarization controller 2, the polarizer 3, another optical fiber polarization controller 4, output coupler 5, isolator 6, high-dopant concentration Er-doped fiber 7 and tunable optic filter 8, utilize the nonlinear polarization rotation effect, build annular chamber passive mode locking erbium doped fiber laser, add tunable optic filter 8 at the output of annular chamber passive mode locking erbium doped fiber laser laser cavity rather than in laser cavity.
Wherein, to connect to form an optic fiber ring-shaped cavity successively be laser cavity for wavelength division multiplexer 1, optical fiber polarization controller 2, the polarizer 3, another optical fiber polarization controller 4, output coupler 5, isolator 6, high-dopant concentration Er-doped fiber 7.
One end of the output of output coupler 5 and tunable optic filter 8 is connected by the optical fiber connector.
Pump light is provided by the semiconductor laser of wavelength for 980 nanometers.
The utility model can bring following effect:
Because tunable optic filter of the present utility model is positioned at the outside in passive mode-locking fiber laser chamber, thereby tunable optic filter do not influence the internal structure in passive mode-locking fiber laser chamber, and easy to operate; Utilize laser chamber to produce the stable mode-locking pulse output of ps magnitude, output at laser chamber connects tunable optic filter, output mode locking pulse spectrum is forced filtering, realized the nearly conversion limit ps magnitude short pulse output of continuously adjustable, and do not influence the overall structure of fiber laser, easy to operate, and can select tunable optic filter flexibly according to the real work needs.
Description of drawings
Fig. 1 is the structural representation of the utility model wide tunable from starting of oscillation passive mode locking erbium doped fiber laser.
Fig. 2 is that the output pulse width of the utility model laser is with wavelength change situation curve chart.
Fig. 3 is that the utility model laser output pulse wavelength is the spectrogram at 1553.3nm place.
Fig. 4 is that the utility model laser output pulse wavelength is the spectrogram at 1558.4nm place.
Fig. 5 is that the utility model laser output pulse wavelength is the spectrogram at 1561.6nm place.
Fig. 6 is that the utility model laser output pulse wavelength is the autocorrelator trace figure at 1561.6nm place.
Among Fig. 1: 1.980nm/1550nm wavelength division multiplexer, 2. optical fiber polarization controller, the 3. polarizer, 4. optical fiber polarization controller, 5. output coupler, 6. isolator, 7. high-dopant concentration Er-doped fiber, 8. tunable optic filter.
Embodiment
It is novel to further specify this usefulness below in conjunction with drawings and Examples.
The structure of wide tunable erbium doped fiber laser of the present utility model, as shown in Figure 1.Comprise: isolator, the polarizer, optical fiber polarization controller PC1, optical fiber polarization controller PC2,980nm/1550nm wavelength division multiplexer, high-dopant concentration Er-doped fiber and output coupler constitute, and the high-dopant concentration Er-doped fiber that uses in experiment is the EDFL1500 of 4m Coractive.Pump light is provided by the 980nm LD of Maximum pumping 120mW; The splitting ratio of output coupler is 10: 90; The tail optical fiber of Polarization Controller, the polarizer, isolator and coupler is general single mode fiber.When pump power one timing, by regulating the state of two Polarization Controllers, the short pulse sequence of fiber laser output ps magnitude.The time-bandwidth product Δ T Δ v 0.314 of short pulse, illustrate that the output short pulse has bigger warbling, frequency spectrum is wide, in order not influence the performance of laser, in the output of laser rather than laser chamber, add tunable optic filter, the output short pulse is forced filtering, realize the nearly conversion limit of the continuously adjustable ps magnitude of laser output wavelength pulse train, this short pulse time-bandwidth product Δ T Δ v ≈ 0.314, and the pulse duration before filtered pulse duration and the filtering is roughly the same.
In the utility model when work: become elliptically polarized light through the line polarisation after the polarizer after through Polarization Controller PC1, it can be considered to synthesizing of left-handed and right-circularly polarized light that intensity do not wait.When the different circularly polarized light of these two direction of rotation obtained the gain amplification through Er-doped fiber, the nonlinear effect (Kerr effect) of experience chamber inner fiber produced different nonlinear phase shifts.Because nonlinear phase shift is relevant with light intensity, thereby along the pulse towards the polarization state difference of different parts.Last two rotatory polarizations produce the coherent superposition effect at the polarizer place, after addition just pulse mode-locked (APM) effect, make in the chamber generation from the amplitude modulation(PAM) saturable absorber, i.e. the locked mode effect that narrows.It is consistent with the polarizer direction that Polarization Controller PC2 is mainly used in the main polarization direction of adjusting the different nonlinear phase shifts interference of experience stack back light pulse, so that the more low intensive front and back of light pulse are a little less than more and more, the light pulse peak value is more and more stronger, forms stable ultrashort light pulse at last.Isolator is used for stoping the back scattering that device brings in the chamber, and this back scattering is inevitably in the laser cavity of standard, and it will cause the inequality of resonant cavity internal schema spectrum and stop from starting of oscillation.Therefore, isolator can so that this laser realize from starting of oscillation.With tunable optic filter the short pulse of output is forced filtering.
The input of 980nm/1550nm wavelength division multiplexer 1 links to each other with semiconductor pumping sources in Fig. 1, one end of two other port is connected with an end of Polarization Controller 2, the other end is connected with an end of high-dopant concentration Er-doped fiber, the other end of Polarization Controller 2 is connected with an end of the polarizer 3, the other end of the polarizer 3 is connected with an end of Polarization Controller 4, the other end of Polarization Controller 4 is connected with an end of output coupler 5, the other end of output coupler 5 is connected with an end of isolator 6, the output of output coupler 5 is connected with the input of tunable optic filter, the other end of isolator is connected with the other end of Er-doped fiber, constitutes a loop.The polarizer 3, two Polarization Controllers 2 and 4, output coupler 5, isolator 6 and 7 of Er-doped fibers all are to be connected by the optical fiber connector.Realize locked mode by regulating two Polarization Controllers, regulate the knob of tunable optic filter 8 behind the locked mode and can realize the adjustable continuously of output wavelength.
An embodiment is as follows: in order not influence the performance of laser, we add tunable optic filter in the output of laser cavity rather than laser cavity.This filter is adjustable continuously in 1530～1560nm, and three dB bandwidth is 1.95 ± 1nm.When pump power is 100mW, regulate the state of two Polarization Controllers, can obtain exporting the mode locking pulse sequence, its repetition rate is 13.9MHz, centre wavelength 1562.3nm, spectrum width 12.4nm.Consider that the output pulse is the sech type, the pulsewidth that obtain this moment is 1.5ps, and time-bandwidth product is Δ T Δ v=2.28, and warbling of this explanation output pulse is bigger.Allow the output pulse of mode locked fiber laser through the obvious broadening of one section dispersion compensating fiber (DCF) afterpulse width, this explanation output pulse just has warbles.And broadening is arranged slightly through general single mode fiber (SMF) afterpulse, and not realizing compression effectiveness yet, this explanation is in the warbling of output pulse, and non-linear chirp has accounted for very big proportion, need force filtering with filter.By filtered mode locking pulse is analyzed, obtain the big full duration of pulse half-shadow (FWHM) with the wavelength change situation, as shown in Figure 2.Therefrom find out, wavelength is adjustable continuously from 1553.2～1562.3nm, be subjected to the restriction of filtering tunable wavelength scope, we can only measure filtered characteristic in the wave-length coverage of output spectrum 1562.3nm left side, but because the spectrum of output mode locking pulse is centrosymmetric with 1562.3nm, so its filtered characteristic also should be consistent.Hence one can see that when tunable reference filter is enough big, should be adjustable continuously in 1553.2～1571.4nm after this passive mode-locking fiber laser filtering, and the variation of filtering afterpulse width is not remarkable.Provided after the filtering spectrogram that obtains at 1553.3nm and 1558.4nm place among Fig. 3 and 4 respectively, Fig. 5 and Fig. 6 have provided output spectrum figure and the autocorrelator trace that obtains at the 1561.6nm place respectively after filtering, its spectral width is 2.2nm, pulsewidth 1.2ps, time-bandwidth product is Δ T Δ v=0.324, illustrates through having obtained the pulse output of nearly conversion limit after the filtering.
Claims (4)
1. a wide tunable is from starting of oscillation passive mode locking erbium doped fiber laser, comprise: wavelength division multiplexer (1), optical fiber polarization controller (2), the polarizer (3), another optical fiber polarization controller (4), output coupler (5), isolator (6), high-dopant concentration Er-doped fiber (7) and tunable optic filter (8), it is characterized in that, wavelength division multiplexer (1), optical fiber polarization controller (2), the polarizer (3), another optical fiber polarization controller (4), output coupler (5), isolator (6), high-dopant concentration Er-doped fiber (7) links to each other successively and builds annular chamber passive mode locking erbium doped fiber laser, is that output coupler (5) connects tunable optic filter (8) at the output of annular chamber passive mode locking erbium doped fiber laser laser cavity.
2. wide tunable according to claim 1 is from starting of oscillation passive mode locking erbium doped fiber laser, it is characterized in that it is laser cavity that wavelength division multiplexer (1), optical fiber polarization controller (2), the polarizer (3), another optical fiber polarization controller (4), output coupler (5), isolator (6), high-dopant concentration Er-doped fiber (7) connect to form an optic fiber ring-shaped cavity successively.
3. wide tunable according to claim 1 is characterized in that from starting of oscillation passive mode locking erbium doped fiber laser the output of output coupler (5) is connected by the optical fiber connector with an end of tunable optic filter (8).
4. wide tunable according to claim 1 is characterized in that from starting of oscillation passive mode locking erbium doped fiber laser wavelength is the pump light input that the output of the semiconductor laser of 980 nanometers is connected to high-dopant concentration Er-doped fiber (7).
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| CNU200820073835XU CN201181809Y (en) | 2008-02-02 | 2008-02-02 | Wide tunable self-start-oscillation passive mode-locking erbium-doped optical fiber laser |
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| CNU200820073835XU CN201181809Y (en) | 2008-02-02 | 2008-02-02 | Wide tunable self-start-oscillation passive mode-locking erbium-doped optical fiber laser |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005689A (en) * | 2010-10-27 | 2011-04-06 | 中国科学院西安光学精密机械研究所 | All-fiber structural laser system capable of generating high-energy wave-free split rectangular pulse |
| CN105428976A (en) * | 2016-01-11 | 2016-03-23 | 中国工程物理研究院激光聚变研究中心 | Mode-locked fiber laser and pulse laser generation method |
| CN108899748A (en) * | 2018-06-22 | 2018-11-27 | 长春理工大学 | Narrow linewidth mode locking thulium-doped fiber laser with high repetition frequency |
-
2008
- 2008-02-02 CN CNU200820073835XU patent/CN201181809Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005689A (en) * | 2010-10-27 | 2011-04-06 | 中国科学院西安光学精密机械研究所 | All-fiber structural laser system capable of generating high-energy wave-free split rectangular pulse |
| CN105428976A (en) * | 2016-01-11 | 2016-03-23 | 中国工程物理研究院激光聚变研究中心 | Mode-locked fiber laser and pulse laser generation method |
| CN108899748A (en) * | 2018-06-22 | 2018-11-27 | 长春理工大学 | Narrow linewidth mode locking thulium-doped fiber laser with high repetition frequency |
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Granted publication date: 20090114 Termination date: 20100202 |