CN203774603U - Coupler-based mode-locked laser - Google Patents
Coupler-based mode-locked laser Download PDFInfo
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- CN203774603U CN203774603U CN201320780227.3U CN201320780227U CN203774603U CN 203774603 U CN203774603 U CN 203774603U CN 201320780227 U CN201320780227 U CN 201320780227U CN 203774603 U CN203774603 U CN 203774603U
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Abstract
The utility model provides a coupler-based mode-locked laser and belongs to the ultra-short pulse laser field. The laser is of an annular cavity structure; the coupler-based mode-locked laser comprises a wavelength division multiplexer (2), a gain optical fiber (3), an isolator (5) as well as a coupler I (4) which is adopted as a mode locking starting element and a coupler II (6) which is adopted as output; pigtails of all components in the laser cavity are standard single-mode optical fibers, so that mode fields of the pigtails of the components can be matched with each other, so that low-loss welding can be realized; and pump light (1) is coupled into the gain optical fiber (3) through the wavelength division multiplexer (2), so that laser can be generated and oscillated in the annular cavity of the gain optical fiber (3). According to the coupler-based mode-locked laser of the utility model, full-optical fiber mode of the whole mode-locked laser can be realized authentically, and complicated light path regulation can be avoided, and the environmental stability, practicability and reliability of the mode-locked laser can be greatly improved.
Description
Technical field
The utility model relates to a kind of mode locked fiber laser, belongs to ultra-short pulse laser field.
Background technology
Ultra-short pulse laser has important application in front line science research, national economy, the national defense safety fields such as physics, chemistry, material science, environmental monitoring, electrooptical countermeasures.In actual application demand, especially, in applications such as accurate measurement, micro-nano processing, mass spectral analyses, need ultra-short pulse laser to there is good environmental stability.Mode locked fiber laser with its compact conformation, stability is high, anti-interference good, beam quality is high etc., and advantage becomes study hotspot in recent years.Utilize at present the multiple locking modeling methods such as carbon nano-tube, saturable absorbing mirror and nonlinear polarization rotation effect all to realize stable ultrashort pulse output.But all there is a common limitation and shortcoming in these locked mode mechanism; in laser cavity, locked mode element is all space discrete component; cannot carry out welding with optical fiber, not only introduce extra insertion loss, increased aligning difficulty, also greatly reduce the environmental stability of fiber laser.
Be coupled the at high proportion coupler of output of the utility model utilization starts and stable element as locked mode.Under low-power, from the power of coupler incident end incident, through linear coupling, can export from coupling output; Under high power, because nonlinear interaction has changed the refractive index of fibre core, between laser incident fibre core and coupling fibre core, there is refringence, linear coupling effect weakens, and from the power of incident end incident, can directly be exported.Therefore coupler has the effect of saturated transmission.The laser operation starting stage, coupler can effectively extract the noise signal with high peak power from noise signal, plays the effect that starts locked mode.After locked mode starts, laser pulse two is lower along intensity, can be coupled output, and pulse center part intensity is higher, can be limited in incident fibre core transmitting, and coupler plays the effect of stable mode-locking.
For fear of existing mode-locked laser, introduce space discrete component, documents " Nonlinear mode ?coupling for passive mode ?locking:application of waveguide arrays; dual ?core fibers; and/or fiber arrays " Optics Express, 13 (22): 8933 ?8950,2005, it proposes to utilize waveguide array, twin-core fiber or fiber array as locked mode starting component.By the Non-linear coupling characteristic between waveguide or fibre core, start with stable mode-locking and turn round.But this method must strictly be controlled the length of waveguide or optical fiber and equal coupling length, and all has cladding size mismatch problems between gain fibre and waveguide array, twin-core fiber or fiber array, welding difficulty, splice loss, splice attenuation is larger.Therefore this scheme, at present still in the theoretical modeling stage, experimentally has the larger difficulty that realizes.The mode-locked laser > > CN102437501B of contrast patent < < based on doped fiber array, it proposes to utilize doped fiber array simultaneously as gain and locked mode element, although effectively avoided the problem of the direct welding difficulty of optical fiber, but this doped fiber array will gain, dispersion, the all functions such as locked mode all concentrate on an optical fiber, and no matter be gain, dispersion or locked mode start and all the performance of laser are had a great impact, therefore this scheme all has great challenge to the design of optical fiber and drawing, existing fibre-optical drawing technique is difficult to realize.
Utility model content
The utility model object is to provide a kind of full optical fiber mode locked laser based on coupler.
The utility model is realized by following technical proposals:
A mode-locked laser based on coupler, laser is ring cavity structure, it comprises wavelength division multiplexer 2, gain fibre 3, isolator 5 and the coupler II 6 of exporting as coupler I 4 and the conduct of locked mode starting component respectively.In laser cavity, all element tail optical fibers are standard single-mode fiber, to guarantee mould field coupling each other, thereby realize low loss welding.Pump light 1 is coupled into gain fibre 3 through wavelength division multiplexer 2, produces laser and in the annular chamber of gain fibre 3, forms vibration.The splitting ratio of the direct output of described coupler I 4 and coupling output is less than 10:90, and input and gain fibre 3 output weldings, the directly input welding of output and isolator 5, coupling output is standard FC/APC joint, as loss, do not access in laser cavity, for at the bottom of the lower pulsed base of loss power and two edges, realize and starting and stable mode-locking.The splitting ratio of the direct output of described coupler II 6 and coupling output is greater than 70:30, and be less than 95:5, and the output welding of input and isolator 5, directly another input welding of output and wavelength division multiplexer 2, coupling output is standard FC/APC joint, for endovenous laser, exports.The isolation of described isolator 5 is greater than 30dB.
Further described pump light 1 centre wavelength is 976nm or 915nm.Wavelength division multiplexer 2 transmission port centre of homology wavelength are consistent with pump light centre wavelength, and bandwidth is 10nm, and reflector port reflection wavelength is at 1000nm～1100nm wave band.Gain fibre 3 doping with rare-earth ions ytterbiums.Isolator 5 work centre wavelength are 1064nm, and bandwidth is 40nm.Coupler I 4 and coupler II 6 operation wavelengths are at 1000nm～1100nm wave band.
Further described pump light centre wavelength is 800nm, 976nm or 1480nm.Wavelength division multiplexer 2 transmission port centre of homology wavelength are consistent with pump light centre wavelength, and bandwidth is 10nm; Reflector port reflection wavelength is at 1520nm～1570nm wave band.Gain fibre 3 doping with rare-earth ions erbiums.Isolator 5 work centre wavelength are 1550nm, and bandwidth is 40nm.Coupler I 4 and coupler II 6 operation wavelengths are at 1520nm～1570nm wave band.
Compare with the mode locked fiber laser of reporting in the past, the utility model has the following advantages:
In laser, all elements comprise the coupler for locked mode, and its manufacture craft is very ripe, and is the business element that non-normal open is used, and does not need extra design and complicated processing technology, has greatly saved cost.In laser, all elements are all optical fibre devices, and mate mould field each other, can easily carry out low-loss welding, do not need space discrete component, really realize the full fiberize of whole mode-locked laser, avoid complicated optical path adjusting, greatly improved environmental stability, improved practicality and the reliability of mode-locked laser.
Accompanying drawing explanation
Fig. 1 is full-optical-fiber laser structural representation in the utility model example.
Fig. 2 is super-Gaussian type impulse waveform and the corresponding linear chrip curve of the utility model example laser output of numerical simulation.
Fig. 3 is the spectrum of the utility model example laser output of numerical simulation.
After Fig. 4 is the utility model example laser steady running of numerical simulation, the evolution process of pulse in laser cavity.
In figure: 1, pump light, 2, wavelength division multiplexer, 3, gain fibre, 4, coupler I, 5, isolator, 6, coupler II.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in detail:
Figure 1 shows that full-optical-fiber laser structural representation of the present utility model.Laser is ring cavity structure, pump light 1 enters laser cavity after by pumping/laser wave division multiplexer 2, after gain fibre 3 amplifies, successively by getting back to wavelength division multiplexer after coupler I 4, isolator 5, coupler II 6, in annular chamber, form vibration, produce laser.In chamber, the tail optical fiber of all elements is the standard single-mode fiber of work centre wavelength 1064nm.Pump light centre wavelength is 976nm.Gain fibre core diameter is 10um, and cladding diameter is 125um, fibre core doping ytterbium ion, and pump light absorption coefficient is 13dB/m, gain fibre length is 0.6m.The work centre wavelength of coupler I 4 is 1064nm, and splitting ratio is 99:1.The wherein input welding of 1% direct output and isolator 5,99% coupling output is as loss.Under low-power, laser power major part is coupled output, and in high power situation, the laser of high-peak power is because nonlinear interaction can change the refractive index of incident optical fibre core, mould field mismatch between fibre core increases, coupling reduces greatly, and laser will mainly remain in incident fibre core and transmit.Therefore, the coupler of high coupling output ratio has the effect of saturated transmission, can effectively from noise signal, extract the noise signal with high peak power, plays the effect that starts locked mode.Meanwhile, pulse two is lower along intensity, can be coupled output, and pulse center part intensity is higher, can be limited in incident fibre core transmitting, and plays the effect of stable mode-locking.The work centre wavelength of isolator 5 is 1064nm, and its effect is that isolation is 32dB in order to guarantee laser one-way transmission.The work centre wavelength of coupler II 6 is 1064nm, and splitting ratio is 10:90, plays the effect of Laser output coupling.For reducing cavity loss, realize locked mode running under low-power, an input of the direct output of coupler II 690% and wavelength division multiplexer 2 carries out welding, and 10% coupling output is as the output of laser.Coupling output adopts standard FC/APC joint, facilitates the application of follow-up laser.Laser output utilizes autocorrelation function analyzer can observe the temporal signatures of output pulse, utilizes spectroanalysis instrument can observe the spectral signature of output pulse.By this laser of numerical simulation, when pumping light power reaches 300mW, can obtain the stable mode-locking pulse output of 6.65nJ.Fig. 2 is for simulating time domain impulse waveform and the corresponding linear chrip curve of this laser obtaining.Can see that pulse two, along steeper, has super-Gaussian shape, this just in coupler I 4 Nonlinear Coupling slacken the result on pulse two edges.Fig. 3 is for simulating the output spectrum of this laser obtaining, and spectral width is 72.5nm.After Fig. 4 is laser steady running, the evolution process of pulse in laser cavity.Pulse is amplified by after coupler I 4 in gain fibre, and pulse two edges are steepening obviously, and under positive dispersion effect, pulse stretching.Therefore the pulse through 6 outputs of coupler II has obvious super-Gaussian time domain specification.
Claims (3)
1. the mode-locked laser based on coupler, it is characterized in that: laser is ring cavity structure, it comprises wavelength division multiplexer (2), gain fibre (3), isolator (5) and the coupler II (6) of exporting as coupler I (4) and the conduct of locked mode starting component respectively; In laser cavity, all element tail optical fibers are standard single-mode fiber, to guarantee mould field coupling each other, thereby realize low loss welding; Pump light (1) is coupled into gain fibre (3) through wavelength division multiplexer (2), produces laser and in the annular chamber of gain fibre (3), forms vibration; The splitting ratio of the direct output of described coupler I (4) and coupling output is less than 10:90, and input and gain fibre (3) output welding, the directly input welding of output and isolator (5), coupling output is standard FC/APC joint, as loss, do not access in laser cavity, for at the bottom of the lower pulsed base of loss power and two edges, realize and starting and stable mode-locking; The splitting ratio of the direct output of described coupler II (6) and coupling output is greater than 70:30, and be less than 95:5, and the output welding of input and isolator (5), directly another input welding of output and wavelength division multiplexer (2), coupling output is standard FC/APC joint, for endovenous laser, exports; The isolation of described isolator (5) is greater than 30dB.
2. the mode-locked laser based on coupler as claimed in claim 1, is characterized in that, described pump light (1) centre wavelength is 976nm or 915nm; Wavelength division multiplexer (2) transmission port centre of homology wavelength is consistent with pump light centre wavelength, and bandwidth is 10nm, and reflector port reflection wavelength is at 1000nm～1100nm wave band; Isolator (5) work centre wavelength is 1064nm, and bandwidth is 40nm; Coupler I (4) and coupler II (6) operation wavelength are at 1000nm～1100nm wave band.
3. the mode-locked laser based on coupler as claimed in claim 1, is characterized in that, described pump light centre wavelength is 800nm, 976nm or 1480nm; Wavelength division multiplexer (2) transmission port centre of homology wavelength is consistent with pump light centre wavelength, and bandwidth is 10nm; Reflector port reflection wavelength is at 1520nm～1570nm wave band; Isolator (5) work centre wavelength is 1550nm, and bandwidth is 40nm; Coupler I (4) and coupler II (6) operation wavelength are at 1520nm～1570nm wave band.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320780227.3U CN203774603U (en) | 2013-12-02 | 2013-12-02 | Coupler-based mode-locked laser |
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| CN201320780227.3U CN203774603U (en) | 2013-12-02 | 2013-12-02 | Coupler-based mode-locked laser |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103840358A (en) * | 2013-12-02 | 2014-06-04 | 北京工业大学 | Mode locking fiber laser based on couplers |
| CN106169690A (en) * | 2016-09-22 | 2016-11-30 | 电子科技大学 | A kind of Gao Zhongying mode locked fiber laser and the method producing Gao Zhongying pulse thereof |
-
2013
- 2013-12-02 CN CN201320780227.3U patent/CN203774603U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103840358A (en) * | 2013-12-02 | 2014-06-04 | 北京工业大学 | Mode locking fiber laser based on couplers |
| CN103840358B (en) * | 2013-12-02 | 2016-08-17 | 北京工业大学 | A kind of mode locked fiber laser based on bonder |
| CN106169690A (en) * | 2016-09-22 | 2016-11-30 | 电子科技大学 | A kind of Gao Zhongying mode locked fiber laser and the method producing Gao Zhongying pulse thereof |
| CN106169690B (en) * | 2016-09-22 | 2019-11-22 | 电子科技大学 | A kind of method that Gao Zhongying mode locked fiber laser generates high repetition pulse |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140813 Termination date: 20141202 |
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| EXPY | Termination of patent right or utility model |