CN110165537A - A kind of tunable wave length passive mode-locking fiber laser based on loss control - Google Patents
A kind of tunable wave length passive mode-locking fiber laser based on loss control Download PDFInfo
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- CN110165537A CN110165537A CN201910428047.0A CN201910428047A CN110165537A CN 110165537 A CN110165537 A CN 110165537A CN 201910428047 A CN201910428047 A CN 201910428047A CN 110165537 A CN110165537 A CN 110165537A
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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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1106—Mode locking
- H01S3/1112—Passive mode locking
- H01S3/1115—Passive mode locking using intracavity saturable absorbers
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- Optics & Photonics (AREA)
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Abstract
The invention discloses a kind of tunable wave length passive mode-locking fiber laser based on loss control, is related to optical fiber laser field.The optical fiber laser uses ring cavity structure, along clockwise direction successively includes semiconductor pumping sources, wavelength division multiplexer, Er-doped fiber, the unrelated isolator of polarization, optical attenuator, optical fiber saturable absorber device, Polarization Controller, output coupler in light circuit.By the insertion loss for changing optical attenuator itself, to change the total losses of light in mode-locked laser annular chamber, keep the transmission loss of the light of intracavitary different wave length different, the final pulse laser for realizing laser output different wave length, i.e. the mode locking output of realization tunable wave length.This laser tuning device is simple, and tuning range is wide, and with good stability.
Description
Technical field
The invention patent relates to optical fiber laser fields, and in particular to a kind of tunable wave length based on loss control is passive
Mode locked fiber laser.
Background technique
Ultrashort pulse passive mode-locking fiber laser is due to narrow pulse width, high-peak power, wideband spectral width etc.
Advantage has a wide range of applications in fields such as basic scientific research, micro-nano material processing, national defence, biology, medical treatment.Wherein, have
The laser with active-passive lock mould output wavelength of tunable wave length characteristic is flexibly controllable, output optical pulse parameter stability and consistency is good,
A tractor serves several purposes may be implemented, and more your writing can be played in fields such as wavelength-division multiplex, optical signal prosessing, light sensing and accurate spectrum
With.
In order to obtain the wavelength tuning output of mode-locked laser, if being included in mode locking light it has already been proposed drying method
The tunable optic filters such as bandpass filter, interference filter, self-frequency shift, intracavitary birefringent adjusting are introduced in fibre laser.But
Structure is complicated for these methods, higher cost, and stability is low.
It is limited in general, laser wavelength tuning range is lost by gain fibre with gain bandwidth.Therefore, for common
Gain fibre is limited by relevant parameter, is difficult to realize wider tuning range.Correlative study finds that the insertion in resonant cavity is damaged
Consumption size can significantly affect the final gain of laser and loss distribution.The accurate additional cavity loss of control is to change optical fiber cavity
Interior population inversion density and the realization tunable output most simple effective method of broad band wavelength.
Summary of the invention
To solve the above-mentioned problems, the present invention provides that a kind of structure is simple, cost is relatively low, and stability is preferably based on being lost
The tunable wave length passive mode-locking fiber laser of control.
Key of the invention is the overall loss in accurate control mode locked fiber laser resonant cavity, to realize mode locking wave
Long tuning.Its Tuning Principle can be explained as follows: in laser resonator, cavity loss is low, and gain fibre is relatively long, guarantees
Low population inversion threshold value, to obtain low gain threshold.Since general gain fibre intermediate waves gain is higher than length
Wave gain, as long as laser output wavelength will be mobile to short-wave band, to adapt to the variation of yield value, instead by increasing cavity loss
It, reduces cavity loss, so that it may so that laser output wavelength is mobile to long-wave band.Therefore, as long as changing the damage of light in resonant cavity
Consumption, so that it may realize the tuning of laser output light spectrum central wavelength.
Optical fiber laser of the present invention uses ring cavity structure, along clockwise direction successively includes semiconductor in light circuit
Pumping source, wavelength division multiplexer, gain fibre, the unrelated isolator of polarization, optical attenuator, optical fiber saturable absorber device, polarization
Controller, output coupler.By changing the insertion loss of optical attenuator itself, to change light in mode-locked laser annular chamber
Total losses, keep the transmission loss of the light of intracavitary different wave length different, the final pulse for realizing laser output different wave length swashs
Light, i.e. the mode locking output of realization tunable wave length.
The semiconductor pumping sources and wavelength division multiplexer, gain fibre, the unrelated isolator of polarization, optical attenuator, optical fiber
Saturable absorber device, Polarization Controller, output coupler use the automatic welding of optical fiber splicer.
The output wavelength of the semiconductor pumping sources is 976nm or 1480nm.
The wavelength division multiplexer reflector port, the unrelated isolator of polarization, output coupler operation wavelength 1520nm extremely
1620nm wave band.
The gain fibre is the Er-doped fiber of high-gain.
The graded index multimode fiber saturable absorber device is by one section of graded index multimode fiber one end
After welding coreless fiber, both ends are distinguished welding general single mode fiber again and are constituted, and are used for the maintenance and starting of mode locking, laser exists
It is narrowed during by graded index fiber, to start and stablize femtosecond pulse.
Preferably, the graded index multimode fiber, length range are arranged in 7cm between 30cm.
Preferably, the coreless fiber, length range are arranged between 50 μm to 500 μm.
Compared with prior art, the tunable wave length passive mode-locking fiber laser of the invention based on loss control, band
That comes has the beneficial effect that.
(1) wavelength tuning output is realized in the loss control, and operating method is simple and effective, and tuning band is wide, output spectrum
It is reliable and stable, convenient for promoting.
(2) the saturable absorber device architecture is simple, is easy to make, and high mechanical strength is hardly damaged.
(3) laser component is the standard component produced in batches on the market, is easy to buy, cheap, is conveniently replaced
Change maintenance.
(4) laser component is all optical fibre structure, it is only necessary to it can be realized by fused fiber splice, it is compact-sized,
It is small in size, facilitate encapsulation.
Detailed description of the invention
The above description is only an overview of the technical scheme of the present invention, for the effect to specific structure of the invention and generation
It is further understood from, below in conjunction with the Detailed description of the invention purpose of the present invention, feature and effect.
Fig. 1 is that one of present example 1 is shown based on the tunable wave length mode locked fiber laser structure of loss control
It is intended to.Element 1 is pumping source in figure, and element 2 is wavelength division multiplexer, and element 3 is er-doped gain fibre, and element 4 is that polarization is unrelated
Isolator, element 5 are commercial optical attenuator, and element 6 is graded index fiber saturable absorber device, and element 7 is polarization
Controller, element 8 are output coupler.
Fig. 2 is the spectrum group picture of laser wavelength tuning mode locking pulse output in present example 1.
Fig. 3 is the pulse sequence diagram of Mode-locking For Lasers operating output in present example 1.
Fig. 4 is the pulse autocorrelation trace figure of Mode-locking For Lasers operating output in present example 1.
Specific embodiment
Embodiment 1
This example provides a kind of tunable wave length passive mode-locking fiber laser based on loss control, and laser specific structure is such as
Shown in Fig. 1.Pumping source 1 is intracavitary by pumping laser injection laser annular resonance by wavelength division multiplexer 2, by er-doped gain light
Fibre 3 after Pumping light absorption, will give off the light of 1550 nm wave bands, and later in annular chamber, polarizing unrelated isolator 4 ensures shape
At unidirectional oscillation, constantly amplify, while constantly being narrowed by graded index fiber saturable absorber device 6, finally via defeated
Coupler 8 generates pulse laser out.In resonant cavity, the purpose that optical attenuator 5 is added is by changing optical attenuator itself
Insertion loss makes the transmission loss of the light of intracavitary different wave length not to change the total losses of light in mode-locked laser annular chamber
Together, the pulse laser of laser output different wave length, i.e. the mode locking output of realization tunable wave length are finally realized.Polarization control is added
The purpose of device 7 processed is optimal cavity performance, improves output laser-quality.
In this example, 1 central wavelength 976nm of pumping source.Wavelength division multiplexer 2 is 1480/1550nm type.Er-doped gain fibre
39 μm of core diameters, length 2m, absorption coefficient are 55dB/m@1532nm.Polarize unrelated 4 operating central wavelength of isolator
1550nm, optical isolation degree are greater than 24dB.Optical attenuator 5 is commercial devices, loss tuning range 0 to 30dB, the interior tuning point of 10dB
Resolution is less than 0.1dB.For graded index fiber saturable absorber device 6, graded index fiber core size is
62.5 μm, length 27.5cm, the length of coreless fiber is 181 μm.Polarization Controller 7 is the mark suitable for general single mode fiber
The quasi- mechanical optical fiber polarization controller of tricyclic.The output coupling ratio of output coupler 8 is 90:10, wherein 10% is used as laser
Output, 90% continues to operate in annular chamber.The tail optical fiber of all elements is all general single mode fiber in resonant cavity, and total chamber is about
For 13m, intracavitary total dispersion is about -0.149ps2。
Under the pump power of 252mW, its insertion loss is controlled by optical attenuator and varies continuously to 16.69dB from 0dB
When, pulse laser central wavelength varies continuously to 1555.9nm from 1602.6nm.Fig. 2 gives three light during the tuning
Spectrogram example, respectively corresponds central wavelength 1602.6nm spectrum when 0dB insertion loss, middle cardiac wave when 0.37dB insertion loss
Central wavelength 1555.9nm spectrum when long 1577.3nm spectrum and 16.69dB insertion loss.During tuning, spectrum 3dB
Bandwidth is stablized in about 5nm, and pulse recurrence frequency is stablized in 16.56MHz(such as Fig. 3), pulse width is stablized in about 800fs(as schemed
4).When insertion loss is reduced to 0dB from 16.69dB, pulse laser central wavelength is returned from 1555.9nm consecutive variations
1602.6nm, during tuning other parameters still be consistent before.
The foregoing is merely preferred embodiments of the invention, are not intended to restrict the invention.It is all in spirit and original of the invention
Within then, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of tunable wave length passive mode-locking fiber laser based on loss control, is related to optical fiber laser field；It is described
Optical fiber laser uses ring cavity structure, successively include along clockwise direction in light circuit semiconductor pumping sources, wavelength division multiplexer,
Gain fibre, the unrelated isolator of polarization, optical attenuator, optical fiber saturable absorber device, Polarization Controller, output coupler；
By changing the insertion loss of optical attenuator itself, to change the total losses of light in mode-locked laser annular chamber, make it is intracavitary not
The transmission loss of the light of co-wavelength is different, the final pulse laser for realizing laser output different wave length, i.e. realization Wavelength tunable
Humorous mode locking output.
2. mode locked fiber laser as described in claim 1, it is characterised in that: mature full light can be used in the optical attenuator
The adjustable optical attenuator of fine structure.
3. mode locked fiber laser as described in claim 1, it is characterised in that: control precision of the optical attenuator to loss
Less than 0.1dB.
4. mode locked fiber laser as described in claim 1, it is characterised in that: the semiconductor pumping sources and wavelength-division multiplex
Device, gain fibre, the unrelated isolator of polarization, optical attenuator, optical fiber saturable absorber device, Polarization Controller, output coupling
Device uses the automatic welding of optical fiber splicer.
5. mode locked fiber laser as described in claim 1, it is characterised in that: the output wavelength of the semiconductor pumping sources is
976nm or 1480nm.
6. mode locked fiber laser as described in claim 1, it is characterised in that: the wavelength division multiplexer reflector port, polarization
Unrelated isolator, output coupler operation wavelength in 1520nm to 1620nm wave band.
7. mode locked fiber laser as described in claim 1, it is characterised in that: the gain fibre is the er-doped light of high-gain
It is fine.
8. mode locked fiber laser as described in claim 1, it is characterised in that: the graded index multimode fiber saturable
Absorber devices are by after one section of graded index multimode fiber one end welding coreless fiber, it is commonly single that welding is distinguished at both ends again
Mode fiber is constituted, and is used for the maintenance and starting of mode locking, and laser is narrowed during through graded index fiber, thus
Start and stablizes femtosecond pulse.
9. mode locked fiber laser as described in claim 1, it is characterised in that: preferably, the graded index
Multimode fibre, length range are arranged in 7cm between 30cm.
10. mode locked fiber laser as described in claim 1, it is characterised in that: preferably, the coreless fiber,
Its length range is arranged between 50 μm to 500 μm.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111509538A (en) * | 2020-03-27 | 2020-08-07 | 中国科学院西安光学精密机械研究所 | Gain-related wavelength-controlled and tunable ultrashort pulse laser generation method and device |
| CN114188809A (en) * | 2021-11-02 | 2022-03-15 | 长春理工大学 | Large-energy all-fiber time-space mode-locked laser and control method and application thereof |
| CN114498260A (en) * | 2021-12-31 | 2022-05-13 | 北京交通大学 | Stable switchable wavelength pulse fiber laser |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101986483A (en) * | 2010-10-08 | 2011-03-16 | 北京航空航天大学 | Passive mode-locked pulsed laser |
| US20140105233A1 (en) * | 2011-06-03 | 2014-04-17 | Korea University Research And Business Foundation | Apparatus for generating single-polarization mode-locked laser capable of energy control |
| CN108321671A (en) * | 2018-03-04 | 2018-07-24 | 中国计量大学 | A kind of passive mode-locking fiber laser based on graded index multimode fiber saturable absorber |
| CN108390248A (en) * | 2018-01-31 | 2018-08-10 | 中国计量大学 | A kind of dual wavelength and tunable wave length passive mode-locking fiber laser |
-
2019
- 2019-05-22 CN CN201910428047.0A patent/CN110165537A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986483A (en) * | 2010-10-08 | 2011-03-16 | 北京航空航天大学 | Passive mode-locked pulsed laser |
| US20140105233A1 (en) * | 2011-06-03 | 2014-04-17 | Korea University Research And Business Foundation | Apparatus for generating single-polarization mode-locked laser capable of energy control |
| CN108390248A (en) * | 2018-01-31 | 2018-08-10 | 中国计量大学 | A kind of dual wavelength and tunable wave length passive mode-locking fiber laser |
| CN108321671A (en) * | 2018-03-04 | 2018-07-24 | 中国计量大学 | A kind of passive mode-locking fiber laser based on graded index multimode fiber saturable absorber |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111509538A (en) * | 2020-03-27 | 2020-08-07 | 中国科学院西安光学精密机械研究所 | Gain-related wavelength-controlled and tunable ultrashort pulse laser generation method and device |
| CN114188809A (en) * | 2021-11-02 | 2022-03-15 | 长春理工大学 | Large-energy all-fiber time-space mode-locked laser and control method and application thereof |
| CN114188809B (en) * | 2021-11-02 | 2024-03-12 | 长春理工大学 | High-energy all-fiber space-time mode-locked laser, and control method and application thereof |
| CN114498260A (en) * | 2021-12-31 | 2022-05-13 | 北京交通大学 | Stable switchable wavelength pulse fiber laser |
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Application publication date: 20190823 |