CN106159651B - A kind of mode locked fiber laser containing circulation optical fiber loop - Google Patents
A kind of mode locked fiber laser containing circulation optical fiber loop Download PDFInfo
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- CN106159651B CN106159651B CN201510178574.2A CN201510178574A CN106159651B CN 106159651 B CN106159651 B CN 106159651B CN 201510178574 A CN201510178574 A CN 201510178574A CN 106159651 B CN106159651 B CN 106159651B
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Abstract
The invention discloses a kind of mode locked fiber lasers containing circulation optical fiber loop, and the tuning of repetition rate and pulsewidth can be carried out to mode-locked pulse signal.The laser includes pumping source, the circulation optical fiber loop for sequentially forming saturable absorber, single mode gain-doped fibers, wavelength division multiplexer, fiber coupler, the second acoustooptic switch and the reflection device of straight line lumen type and being formed by fiber coupler, image intensifer and the first acoustooptic switch.Ground pulse signal is formed by saturable absorber, single mode gain-doped fibers, pumping source and metallic-membrane plating reflector, it is added in pulse signal traveling optical path by the state transformation of acoustooptic switch by optical fiber loop is recycled, the modulation effect of pulse repetition frequency and pulsewidth is determined by the time of acoustooptic switch state transformation.The present invention has the advantages that mode locking is stable, tuning is convenient, low in cost, room temperature operating.
Description
Technical field
The invention belongs to laser technology fields, and in particular to a kind of mode locked fiber laser containing circulation optical fiber loop.
Background technique
Mode locked fiber laser is addition, mode-locking device, fiber coupler and feedback on the basis of fiber amplifier
Resonant cavity etc. is constituted.Compared with solid mode-locked laser, it the advantage is that small in size, structure is simple；It does not need to carry out optical path
Space Collimation is adjusted repeatedly；It builds and finishes substantially after welding between each tail optical fiber；It is about several due to mode field area very little in optical fiber
Ten square microns, it is easy to form very high power density, transmit in a fiber free from the influence of the external environment；With optical communication
Device matching, it is cheap.
Realize that the mode locking pulse output of optical fiber laser has active mode locking technique and two kinds of passive mode-locking technology selections.Actively
Mode-locking technique possesses the advantages that high repetition rate, line width.But it joined mode locking modulator due to intracavitary, not only increase laser
The cost of device, while cavity loss is also added, reduce the output energy of laser pulse.And passive mode-locking fiber laser exists
Intracavitary addition saturable absorber realizes the locking to longitudinal mode using its saturated absorption process to export ultrashort pulse letter
Number；Because of characteristics such as its is high-efficient, light weight, high reliablity, stability height, have been favored by people.But due to passive mode-locking
The output pulse recurrence frequency of the principle and characteristic of optical fiber laser, direct passive mode-locking fiber laser does not have generally with pulsewidth
There is tuber function.From current existing technology, think more easily to realize that the function of repetition rate tuning is relatively difficult
's.
Summary of the invention
The purpose of the present invention is to provide a kind of mode locked fiber lasers containing circulation optical fiber loop, provide a kind of repetition
The optical fiber laser of frequency and the higher Mode-locked laser output of adjustable pulse width, stability.
The technical solution for realizing the aim of the invention is as follows: a kind of mode locked fiber laser containing circulation optical fiber loop,
Saturable absorber, single mode gain-doped fibers, wavelength division multiplexer, fiber coupler, including sequentially forming straight line lumen type
Two acoustooptic switch and reflection device further include pumping source, fiber coupler, image intensifer) and the first acoustooptic switch.
The connection of the pumping light input end of pumping source and wavelength division multiplexer, by laser coupled inlet wire shape laser cavity, single mode increases
Beneficial doped fiber one end is connect with saturable absorber, and the output end connection of the other end and wavelength division multiplexer, single mode adulterates gain
Optical fiber generates signal laser gain under pumping laser.Wavelength division multiplexer signal end is connect with one arm of fiber coupler input terminal,
Another arm of fiber coupler output end is connect with image intensifer, the arm and the first acoustooptic switch of fiber coupler output end
Connection, image intensifer and the connection of the first acoustooptic switch, fiber coupler, image intensifer and the first acoustooptic switch form circulation optical fiber
Another arm of loop, fiber coupler output end is connect with the second acoustooptic switch, and the second acoustooptic switch is connect with reflection device, is led to
Cross reflection device output mode-locked pulse signal.
Above-mentioned connection type uses fiber coupling.
First acoustooptic switch and the second acoustooptic switch are used to the traveling optical path of control ground state pulse signal to change mode locking
The chamber of chamber is long, to be modulated to pulse signal.
Fiber coupler is used to a part of pulse light of fixed proportion in line chamber being input to circulation optical fiber loop
In.
Image intensifer is used to compensate amplification to the light by fiber coupler loss in circulation optical fiber loop.
Reflection device selects metallic-membrane plating reflector, semi-reflective mirror or circulator.
The operation wavelength of the reflection device is in the gain spectral range of single mode doped gain fiber.
The pumping source is semiconductor laser, solid state laser, gas laser, optical fiber laser or raman laser
Device exports the central wavelength range of pump light are as follows: 700nm-2000nm.
The saturable absorber is semiconductor saturable absorbing mirror, graphene saturable absorbing mirror or carbon nanotube.
Compared with prior art, the present invention its remarkable advantage: (1) present invention is logical by adding optical fiber circulation in Mode-Locking Cavity
The mode on road is tuned pulse signal pulsewidth and repetition rate, efficiently avoids mode locking modulator to Output optical power
The loss of generation, to obtain the output of pulse signal of higher-wattage.
(2) present invention is optical fibre device using device, and connection type is fiber coupling, significantly reduces system
Device cost, while system bulk is reduced, be conducive to modular build.
(3) laser cavity of the present invention uses linear cavity configuration, effectively improves the stability of pulse, while greatly reducing
Influence of the environment temperature to its working condition.
Detailed description of the invention
Fig. 1 is the overall structure diagram of mode locked fiber laser of the present invention containing circulation optical fiber loop.
Fig. 2 is the timing that the first acoustooptic switch, the second acoustooptic switch in the embodiment of the present invention one modulate output signal
Figure.
Specific embodiment
Present invention is further described in detail with reference to the accompanying drawing.
In conjunction with Fig. 1, a kind of mode locked fiber laser containing circulation optical fiber loop can including sequentially form straight line lumen type
Saturated absorbing body 1, single mode gain-doped fibers 2, wavelength division multiplexer 3, fiber coupler 5, the second acoustooptic switch 8 and reflection device
9, it further include pumping source 4, fiber coupler 5, image intensifer 6 and the first acoustooptic switch 7.
Pumping source 4 is connect with the pumping light input end of wavelength division multiplexer 3, will be in laser coupled inlet wire shape laser cavity.
2 one end of single mode gain-doped fibers is connect with saturable absorber 1, the output end of the other end and wavelength division multiplexer 3
Connection, single mode doped gain fiber 2 generate signal laser gain under pumping laser.
3 signal end of wavelength division multiplexer is connect with 5 input terminal of fiber coupler, one arm.
Another arm of 5 output end of fiber coupler is connect with image intensifer 6.
One arm of 5 output end of fiber coupler is connect with the first acoustooptic switch 7.
Image intensifer 6 and the connection of the first acoustooptic switch 7, fiber coupler 5, image intensifer 6 and the formation of the first acoustooptic switch 7
Recycle optical fiber loop.
Another arm of 5 output end of fiber coupler is connect with the second acoustooptic switch 8, the second acoustooptic switch 8 and reflection device 9
Connection exports mode-locked pulse signal by reflection device 9.
Above-mentioned connection type uses fiber coupling.
First acoustooptic switch 7 and the second acoustooptic switch 8 are used to the traveling optical path of control ground state pulse signal to change lock
The chamber of die cavity is long, to be modulated to pulse signal.
Fiber coupler 5 is used to a part of pulse light of fixed proportion in line chamber being input to circulation optical fiber loop
In.
Image intensifer 6 is used to compensate amplification to the light being lost by fiber coupler 5 in circulation optical fiber loop.
Reflection device 9 selects metallic-membrane plating reflector, semi-reflective mirror or circulator.
The operation wavelength of the reflection device 9 is in the gain spectral range of single mode doped gain fiber 2.
The pumping source 4 is semiconductor laser, solid state laser, gas laser, optical fiber laser or raman laser
Device exports the central wavelength range of pump light are as follows: 700nm-2000nm.
The saturable absorber 1 is semiconductor saturable absorbing mirror, graphene saturable absorbing mirror or carbon nanotube.
Embodiment one
A kind of mode locked fiber laser containing circulation optical fiber loop, the saturable absorption including sequentially forming straight line lumen type
Body 1, single mode gain-doped fibers 2, wavelength division multiplexer 3, fiber coupler 5, the second acoustooptic switch 8 and metallic-membrane plating reflector 9, are also wrapped
Include pumping source 4, fiber coupler 5, image intensifer 6 and the first acoustooptic switch 7.
The pumping light input end of pumping source 4 and wavelength division multiplexer 3 is by fiber coupling, by laser coupled inlet wire shape laser cavity
Interior, the pump wavelength of pumping source 4 is 1550nm.
2 one end of single mode gain-doped fibers is connect with saturable absorber 1, the output end of the other end and wavelength division multiplexer 3
Connection, single mode doped gain fiber 2 generate signal laser gain under pumping laser.
3 signal end of wavelength division multiplexer and 5 input terminal of fiber coupler, one arm pass through fiber coupling.
For another arm and image intensifer 6 of 5 output end of fiber coupler by fiber coupling, fiber coupler 5 is used for will be straight
The pulse light of 40% ratio is input in circulation optical fiber loop in line chamber.
One arm of 5 output end of fiber coupler and the first acoustooptic switch 7 pass through fiber coupling.
Image intensifer 6 and the first acoustooptic switch 7 pass through fiber coupling, fiber coupler 5, image intensifer 6 and the first acousto-optic
Switch 7 forms circulation optical fiber loop.
Another arm of 5 output end of fiber coupler and the second acoustooptic switch 8 by fiber coupling, the second acoustooptic switch 8 with
Metallic-membrane plating reflector 9 exports mode-locked pulse signal by fiber coupling, by metallic-membrane plating reflector 9.
When the output of pumping source 4 by wavelength division multiplexer 3 be coupled into linear laser it is intracavitary after, the first acoustooptic switch 7 is disconnected at this time
It opens, the second acoustooptic switch 8 closure (succinct to describe, to set acoustooptic switch closed state below as " 1 ", off-state is " 0 "), this
When output mode-locked pulse signal be whole system ground state, according to the optical principle of passive mode-locking, the repetition rate of pulse at this time
The length of the corresponding a length of entire linear cavity of chamber.After entire linear laser chamber enters stable state, we are by introducing circulation optical fiber
Loop is modulated pulse signal with the chamber length for changing entire Mode-Locking Cavity.
It is that the first acoustooptic switch 7 disconnects in conjunction with Fig. 2: t0 period, the second acoustooptic switch 8 closure, laser output lock
Mould pulse signal.When the spike of pulse signal reaches fiber coupler 5, the second acoustooptic switch 8 is disconnected, is closed the first sound
Photoswitch 7, system output pulse-free signal exports at this time, and mode-locked signal enters circulation optical fiber loop and recycled.It is recycling
After a period of time, when spike reaches fiber coupler 5 in recycling optical fiber loop, the first acoustooptic switch 7, closure second are disconnected
Acoustooptic switch 8 exports spike signal at this time, then the variation long due to Mode-Locking Cavity, and pulse signal pulsewidth at this time is
Into modulation has been crossed, modulation depth is determined by t2.After spike output, it is closed the first acoustooptic switch 7, disconnects the second acoustooptic switch
8, it repeats the above steps, next pulse spike is exported after the t1 time.Then the repetition rate of pulse signal is also modulated,
New repetition rate is determined by time t1.
Disconnection and closed procedure by above-mentioned periodic acoustooptic switch, mode-locked pulse signal pulsewidth based on linear cavity with
Repetition rate is just modulated, and one group of new pulse signal is produced.
When signal is assigned in circulation optical fiber loop by fiber coupler with fixed proportion, intensity is inevitable
Some losses are received, therefore the image intensifer 6 for being added in circulation loop fiber coupling compensates it.
The present invention utilizes acoustooptic switch, is changed by chamber length of the addition circulation optical fiber loop to linear Mode-Locking Cavity, from
And realize the tuning to mode-locked pulse signal repetition rate and pulsewidth；Used unit is conventional optical device, to material
Technical requirements are not high, and structure is simple, and stability is high, it is easy to accomplish.
Claims (9)
1. a kind of mode locked fiber laser containing circulation optical fiber loop, it is characterised in that: including sequentially forming straight line lumen type
Saturable absorber (1), single mode gain-doped fibers (2), wavelength division multiplexer (3), fiber coupler (5), the second acoustooptic switch
It (8) and reflection device (9) further include, pumping source (4), image intensifer (6) and the first acoustooptic switch (7)；
Pumping source (4) is connect with the pumping light input end of wavelength division multiplexer (3), will be in laser coupled inlet wire shape laser cavity；
Single mode gain-doped fibers (2) one end is connect with saturable absorber (1), the output of the other end and wavelength division multiplexer (3)
End connection, single mode doped gain fiber (2) generate signal laser gain under pumping laser；
Wavelength division multiplexer (3) signal end is connect with one arm of fiber coupler (5) input terminal；
One arm of fiber coupler (5) output end is connect with image intensifer (6)；
Second arm of fiber coupler (5) output end is connect with the first acoustooptic switch (7)；
Image intensifer (6) and the first acoustooptic switch (7) connection, fiber coupler (5), image intensifer (6) and the first acoustooptic switch
(7) circulation optical fiber loop is formed；
The third arm of fiber coupler (5) output end is connect with the second acoustooptic switch (8), the second acoustooptic switch (8) and reflection
Device (9) connection exports mode-locked pulse signal by reflection device (9).
2. the mode locked fiber laser according to claim 1 containing circulation optical fiber loop, it is characterised in that: above-mentioned connection
Mode uses fiber coupling.
3. the mode locked fiber laser according to claim 1 containing circulation optical fiber loop, it is characterised in that: the first acousto-optic
The traveling optical path that switch (7) and the second acoustooptic switch (8) are used to control ground state pulse signal is long with the chamber for changing Mode-Locking Cavity, from
And pulse signal is modulated.
4. the mode locked fiber laser according to claim 1 containing circulation optical fiber loop, it is characterised in that: fiber coupling
Device (5) is used to be input to a part of pulse light of fixed proportion in line chamber in circulation optical fiber loop.
5. the mode locked fiber laser according to claim 1 containing circulation optical fiber loop, it is characterised in that: circulation optical fiber
Image intensifer (6) is used to compensate amplification to the light by fiber coupler (5) loss in loop.
6. the mode locked fiber laser according to claim 1 containing circulation optical fiber loop, it is characterised in that: reflection device
(9) metallic-membrane plating reflector, semi-reflective mirror or circulator are selected.
7. the mode locked fiber laser according to claim 1 containing circulation optical fiber loop, it is characterised in that: the reflection
The operation wavelength of device (9) is in the gain spectral range of single mode doped gain fiber (2).
8. the mode locked fiber laser according to claim 1 containing circulation optical fiber loop, it is characterised in that: the pumping
Source (4) is semiconductor laser, solid state laser, gas laser, optical fiber laser or Ramar laser, exports pump light
Central wavelength range are as follows: 700nm-2000nm.
9. the mode locked fiber laser according to claim 1 containing circulation optical fiber loop, it is characterised in that: described to satisfy
It is semiconductor saturable absorbing mirror, graphene saturable absorbing mirror or carbon nanotube with absorber (1).
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6570892B1 (en) * | 1997-07-11 | 2003-05-27 | Calmar Optcom, Inc. | Passively mode-locked fiber lasers |
| US20120155499A1 (en) * | 2010-12-16 | 2012-06-21 | Industrial Technology Research Institute | Mode locked fiber laser system |
| CN102856782A (en) * | 2012-09-07 | 2013-01-02 | 山东海富光子科技股份有限公司 | 975nm all-fiber laser |
| CN103151686A (en) * | 2013-02-22 | 2013-06-12 | 北京工业大学 | Raman fiber laser based on graphene oxide passive mode-locking |
| CN104037599A (en) * | 2014-06-07 | 2014-09-10 | 吉林大学 | Optical soliton generation device based on passive mode-locked ytterbium-doped fiber laser |
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2015
- 2015-04-16 CN CN201510178574.2A patent/CN106159651B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6570892B1 (en) * | 1997-07-11 | 2003-05-27 | Calmar Optcom, Inc. | Passively mode-locked fiber lasers |
| US20120155499A1 (en) * | 2010-12-16 | 2012-06-21 | Industrial Technology Research Institute | Mode locked fiber laser system |
| CN102856782A (en) * | 2012-09-07 | 2013-01-02 | 山东海富光子科技股份有限公司 | 975nm all-fiber laser |
| CN103151686A (en) * | 2013-02-22 | 2013-06-12 | 北京工业大学 | Raman fiber laser based on graphene oxide passive mode-locking |
| CN104037599A (en) * | 2014-06-07 | 2014-09-10 | 吉林大学 | Optical soliton generation device based on passive mode-locked ytterbium-doped fiber laser |
Non-Patent Citations (1)
| Title |
|---|
| 基于石墨烯可饱和吸收体的被动锁模、被动调Q掺镱光纤激光器;刘江等;《中国激光》;20110831;第38卷(第8期);第0802001-1到0802001-5页 |
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