CN203039222U - A self-starting mode-locked fiber laser with a stably-controlled polarization state - Google Patents
A self-starting mode-locked fiber laser with a stably-controlled polarization state Download PDFInfo
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- CN203039222U CN203039222U CN 201320071772 CN201320071772U CN203039222U CN 203039222 U CN203039222 U CN 203039222U CN 201320071772 CN201320071772 CN 201320071772 CN 201320071772 U CN201320071772 U CN 201320071772U CN 203039222 U CN203039222 U CN 203039222U
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Abstract
The utility model discloses a self-starting mode-locked fiber laser with a stably-controlled polarization state. The self-starting mode-locked fiber laser is characterized by comprising a pumping source 1, a wavelength division multiplexer 2, a gain fiber 3, a non-gain fiber 4, a polarization controller 5, and a polarization beam splitter 6 which are connected successively. The wavelength division multiplexer 2 is used for coupling pumping light and reflected light to an optical path. The gain fiber 3 is used for generating population inversion required by laser. The non-gain fiber 4 is used for controlling the repetition frequency of the laser. The polarization controller 5 is used for changing the polarization state of the laser. The polarization beam splitter 6 is used for dividing the laser into two beams. One laser output end of the polarization beam splitter 6 is connected with a saturable absorber 7 used for generating nonlinear saturated absorption to achieve mode-locked self starting. The other laser output end of the polarization beam splitter 6 is a polarization-maintaining output end. The reflected light of the saturable absorber 7 enters the wavelength division multiplexer 2 through the polarization beam splitter 6. The self-starting mode-locked fiber laser with a stably-controlled polarization state has advantages of stable mode-locked impulse sequences, a strong anti-interference capability, and long-term stable operation of the laser, and achieving output of pulse laser with different repetition frequency and central wavelength.
Description
[technical field]
The utility model relates to the self-starting mode locked fiber laser of the stable control of polarization state
[background technology]
Because fiber laser has that gain characteristic is good, output beam quality is good, volume is little, uses is flexible, and characteristics such as optical fiber telecommunications system is easy to connect, makes fiber pulse laser obtain extensive use in various fields.The locked mode mode that fiber pulse laser is commonly used has polarization rotation locked mode and saturable absorption locked mode at present, but all there is certain defective, the locked mode threshold value height of polarization rotation locked mode, and optical fiber quality is subjected to external interference easily, the mechanical oscillation meeting causes the unstable even disappearance of polarization rotation locked mode, the pulse that obtains does not have long-time stability, and the modulation of pulse train is also quite big, can not self-starting; The saturable absorption locked mode can be realized the locked mode self-starting, but the pulse that obtains is easily divided, strong noise, and long-time mode locking pulse can cause damage to saturable absorber.Generally all be to adopt to add protective cover and use damped platform etc. mode to reduce the influence that various noises bring in the experiment, but it is also infeasible in actual applications, particularly in the industrial lasers application, strenuous vibration is inevitably, can not eliminate interference by these measures.
Protecting polarisation output also becomes the emphasis of fiber laser research, and optical fiber communication external modulation, optic fiber gyroscope, sensing etc. all have strict demand to the polarization characteristic of laser, requires it that single polarization output is arranged.The general laser that adopts non-polarization maintaining optical fibre to make can access more steady power output, but the polarization state disorder of laser adds the power output instability that the polarizer can make laser simply, and polarization characteristic can not get also improving.Realize that the simplest method of single polarization output is to adopt polarization maintaining optical fibre to make laser, but because the inclined to one side doped fiber of guarantor is expensive, and technology is ripe not enough, can not satisfy application requirements, and its application is restricted.
Another factor that influences the fiber laser development is exactly pump power, in general, the laser of low-power pumping can greatly reduce the cost of integral device, but when the low-power pumping, start and keep locked mode and will become more difficult, and influence the long-time stability of locked mode.
[utility model content]
The utility model has overcome the deficiency of above-mentioned technology, the self-starting mode locked fiber laser of the stable control of a kind of polarization state is provided, the σ cavity structure is adopted in this invention, jointly control with polarization rotation and saturable absorption, at first be to utilize the saturable absorption physical efficiency to realize the locked mode self-starting, and reduced the locked mode threshold value, good stability, its absorption response time can the control impuls width; The polarization rotation can be divided by suppressor pulse then, reduces the locked mode noise, and the mode locking pulse sequence that both while locked modes obtain is more stable, and antijamming capability is stronger, and laser can steady in a long-termly move; Realize pulse laser guarantor output partially with polarization beam apparatus at last.Use the optical fiber of different length simultaneously instead, and the gain fibre of different model, polarization beam apparatus and saturable absorber, can realize the pulse laser output of different repetition rates and centre wavelength.Adopt polarization beam apparatus and the saturable absorber of optical fiber encapsulation, can make the laser of helping optical fiber.
For achieving the above object, the utility model has adopted following technical proposal:
The self-starting mode locked fiber laser of the stable control of a kind of polarization state, include and connect pumping source 1 in turn, be used for pump light and the reverberation into wavelength division multiplexer 2 of light path that is coupled, gain fibre 3 for generation of the required inverted population of laser, the non-gain fibre 4 that is used for the control laser repetition rate, be used for changing the Polarization Controller 5 of laser polarization state and the polarization beam apparatus 6 that is used for laser is divided into two bundles, described polarization beam apparatus 6 one laser outputs connect the saturable absorber 7 of realizing the locked mode self-starting for generation of non-linear saturated absorption, polarization beam apparatus 6 another laser outputs are for protecting inclined to one side output, and the reverberation of described saturable absorber 7 enters in the wavelength division multiplexer 2 through polarization beam apparatus 6.
Be provided with λ/4 wave plates and lenticule between described polarization beam apparatus 6 and the saturable absorber 7 successively.
Be provided with optical collimator between described Polarization Controller 5 and the polarization beam apparatus 6.
Be provided with optical isolator between described Polarization Controller 5 and the light collimator.
Be provided with optical collimator between described polarization beam apparatus 6 and the wavelength division multiplexer 2.
Be provided with Polarization Controller between described polarization beam apparatus 6 and the saturable absorber 7.
Be provided with optical isolator between described Polarization Controller 5 and the polarization beam apparatus 6.
Described gain fibre 3 is single mode, multimode fiber, double clad or photonic crystal, and described non-gain fibre 4 also is single mode, multimode fiber, double clad or photonic crystal.
Described polarization beam apparatus 6 is space polarization beam apparatus or 2 * 2 full optical polarization beam splitter.
Described saturated absorbing body 7 has the speculum of saturated absorption characteristic ion for semiconductor saturable absorption speculum, the speculum that is coated with the saturated absorption material or doping.
The beneficial effects of the utility model are:
1, the utility model can be realized the mode locked fiber laser of the stable control of polarization state, can form stable locked mode self-starting, does not need artificial adjustment, and is easy to use, is fit to satisfy the application of industrial lasers; The pulse of its output is that polarization state realizes self-stabilization control, and is to realize in the conventional non-polarization maintaining optical fibre that stable guarantor exports a series of practical applications such as favourable pulse compression, regulation and control, nonlinear frequency transformation, nonlinear optics imaging partially.
2, the utility model utilizes the quick non-linear saturation effect of nonlinear polarization rotation control generation equivalence in the fiber laser cavity, reduce the threshold value of saturated absorption in the fiber laser cavity, obtain the locked mode self-starting of ultralow threshold value, overcome in the conventional passive mode locking optical-fiber laser pulse fluctuation or saturated absorbing body is penetrated in long-term illumination, as semiconductor saturable absorption speculum (SESAM) etc., and the light injury that produces inevitably, long-time stability and the useful life of increase modelocked fiber laser.
3, the utility model is beneficial to the non-linear rotation of control optical fiber polarisation to clamp down on peak power in the fiber laser cavity, reduce the pulse fluctuation of passive mode locking, overcome conventional nonlinear polarization rotation locked mode and be subject to defectives such as external interference, obtain stable locked mode ultra-short pulse laser, also be beneficial to and overcome the pulse fluctuation damage possible to the SESAM speculum.
4, the utility model locked mode self-starting under low pumping threshold can overcome the spectrum distortion that nonlinear effect may be induced in the optical fiber cavity, exports the Gaussian spectrum of no spectrum distortion; Also can overcome the influence of nonlinear fiber B integration pulse-width, the output pulse is easy to compression, and it is high and do not have a femtosecond pulse of secondary lobe to obtain the pulse contrast; Low high-order nonlinear effect and the intensity-phase noise that can greatly reduce in the laser cavity of locked mode threshold value.
5, the related stable self-starting mode locked fiber laser of controlling of polarization state of the utility model, the multiple regulate and control method of compatible modelocked fiber laser pulse time frequency spectrum characteristic is as polarization state, control optical-fiber laser cavity length etc. in tuning pumping light power, the control optical fiber cavity.
[description of drawings]
Fig. 1 is principle assumption diagram of the present utility model;
Fig. 2 is the utility model embodiment one half space half optical fiber laser structure schematic diagram;
Fig. 3 is the utility model embodiment two full-optical-fiber laser structural representations.
[embodiment]
Be described in further detail below in conjunction with accompanying drawing and execution mode of the present utility model:
As shown in Figure 1, the self-starting mode locked fiber laser of the stable control of a kind of polarization state, it is characterized in that: include and connect pumping source 1 in turn, be used for pump light and the reverberation into wavelength division multiplexer 2 of light path that is coupled, gain fibre 3 for generation of the required inverted population of laser, the non-gain fibre 4 that is used for the control laser repetition rate, be used for changing the Polarization Controller 5 of laser polarization state and the polarization beam apparatus 6 that is used for laser is divided into two bundles, described polarization beam apparatus 6 one laser outputs connect the saturable absorber 7 of realizing the locked mode self-starting for generation of non-linear saturated absorption, polarization beam apparatus 6 another laser outputs are for protecting inclined to one side output, and the reverberation of described saturable absorber 7 enters in the wavelength division multiplexer 2 through polarization beam apparatus 6.
Embodiment one:
As shown in Figure 2, be provided with λ/4 wave plates and lenticule between described polarization beam apparatus 6 and the saturable absorber 7 successively.
Be provided with optical collimator between described Polarization Controller 5 and the polarization beam apparatus 6.
Be provided with optical isolator between described Polarization Controller 5 and the optical collimator.
Be provided with optical collimator between described polarization beam apparatus 6 and the wavelength division multiplexer 2.
Present embodiment is half space half optical fiber laser structure as mentioned above, adopts σ cavity configuration shown in Figure 2, utilizes saturable absorbing mirror and polarization to rotate to realize locked mode.
Present embodiment employing wavelength is that the semiconductor laser of 980nm carries out forward pumping, is coupled into light path by wavelength division multiplexer, for abundant absorption, adopts highly doped Yb dosed optical fiber as gain media.The light that comes out from Yb dosed optical fiber enters the monomode fiber of HI1060, and monomode fiber is used for the control repetition rate here, by f=c/nL as can be known, wherein f is repetition rate, and c is the light velocity, and n is optical fibre refractivity, L is cavity length, and the chamber that changes laser is long, can realize different repetitive frequency pulsed outputs.Light enters Polarization Controller behind monomode fiber, changes the polarization state of laser.Light is guaranteed the unidirectional operation of light by the optical isolator that a wavelength is 1040nm then.Optical collimator becomes spatial light by optical fiber light, and the centre wavelength of used optical collimator is 1040nm, and coupling distance is 300mm.Spatial light is divided into vertical polarization and horizontal polarization two-beam through a centre wavelength at the space of 1040nm polarization beam apparatus, a branch of light is used for output, the λ that another Shu Guang is 1040nm through a wavelength/4 slides, change of polarized direction 45 degree focus on the saturable absorber by the lenticule handle then.Used saturable absorber centre wavelength is 1040nm, and modulation depth is 40, and time delay is 7ps.The light that reflects by saturable absorber passes through the slide outgoing of λ/4 of 1040nm again, and light polarization direction changes 45 degree again, and horizontal polarization light originally becomes the light of vertical polarization, reflects during again through polarization beam apparatus.Optical collimator with pairing advances space optical coupling in the chamber again.Here optical collimator is about 150mm to the distance of saturable absorber, and round trip just satisfies the coupling distance of a pair of saturable absorber, and the coupling efficiency of used optical collimator is 70%.The light that is coupled in the chamber enters wavelength division multiplexer formation annular chamber.
Embodiment two:
As shown in Figure 3, be provided with Polarization Controller between described polarization beam apparatus 6 and the saturable absorber 7.
Be provided with optical isolator between described Polarization Controller 5 and the polarization beam apparatus 6.
As mentioned above, present embodiment is the full-optical-fiber laser structure, adopts σ cavity configuration shown in Figure 3, utilizes saturable absorbing mirror and polarization to rotate to realize locked mode.
Present embodiment employing wavelength is that the semiconductor laser of 980nm carries out forward pumping, is coupled into light path by wavelength division multiplexer, for abundant absorption, adopts highly doped Yb dosed optical fiber as gain media.Monomode fiber is used for the control repetition rate, and its length is decided according to actual required pulse repetition rate.Polarization Controller is used for changing the polarization state of laser.Light is guaranteed the unidirectional operation of light by the optical isolator that a wavelength is 1040nm then.The light access centre wavelength of coming out through isolator is the fibre optic polarizing beam splitter of 1040nm, and wherein fibre optic polarizing beam splitter one adjacent both ends is monomode fiber, is used for connecting isolator and wavelength division multiplexer, is used for circulation in the chamber; Two ends are polarization maintaining optical fibre in addition, are used for output and are connected the optical fiber saturable absorber, and used saturable absorber centre wavelength is 1040nm.
Embodiment three:
The control of wavelength centered by the present embodiment keeps the laser cavity structure constant in Fig. 2 and Fig. 3, utilizes saturable absorbing mirror and polarization to rotate to realize locked mode.
Present embodiment employing wavelength is that the semiconductor laser of 980nm carries out forward pumping, with wavelength division multiplexer pump light is coupled into light path, adopts highly doped Er-doped fiber as gain media, with the repetition rate of centre wavelength 1550nm monomode fiber control impuls.Light enters Polarization Controller behind monomode fiber, changes the polarization state of laser.The light optical isolator that is 1550nm by a wavelength again then, guarantee the unidirectional operation of light, centre wavelength with optical collimator, λ/4 slides, space polarization beam apparatus and saturable absorber among Fig. 2 is changed to 1550nm, realizes that half space half fiber optic hub wavelength is in the pulse laser output of 1550nm; Change fibre optic polarizing beam splitter and saturable absorber into centre wavelength 1550nm among Fig. 3 and get final product, realize that then full optical fiber online centre wavelength is in the pulse laser output of 1550nm.
Described gain fibre (3) is single mode, multimode fiber, double clad or photonic crystal, and described non-gain fibre (4) also is single mode, multimode fiber, double clad or photonic crystal.
As mentioned above, by the type of change gain fibre and the type of non-gain fibre, realize the output of different centre wavelength pulse lasers.
Described polarization beam apparatus 6 is space polarization beam apparatus or 2 * 2 full optical polarization beam splitter.
As mentioned above, realize the system receipts of the non-linear saturated suction control of polarization state in the fiber laser cavity by the type that changes polarization beam apparatus.
Described saturated absorbing body 7 for semiconductor saturable absorption speculum, be coated with the saturated absorption material speculum, mixing has the speculum of saturated absorption characteristic ion, or with the optical fiber Bragg raster speculum of the combination of saturable material.
As mentioned above, realize the output of different centre wavelength pulse lasers by the type that changes saturated absorbing body.
Claims (10)
1. a polarization state is stablized the self-starting mode locked fiber laser of control, it is characterized in that: include and connect pumping source (1) in turn, be used for pump light and the reverberation into wavelength division multiplexer of light path (2) that is coupled, gain fibre (3) for generation of the required inverted population of laser, the non-gain fibre (4) that is used for the control laser repetition rate, be used for changing the Polarization Controller (5) of laser polarization state and the polarization beam apparatus (6) that is used for laser is divided into two bundles, described polarization beam apparatus (6) one laser outputs connect the saturable absorber (7) of realizing the locked mode self-starting for generation of non-linear saturated absorption, another laser output of polarization beam apparatus (6) is for protecting inclined to one side output, and the reverberation of described saturable absorber (7) enters in the wavelength division multiplexer (2) through polarization beam apparatus (6).
2. the self-starting mode locked fiber laser of the stable control of a kind of polarization state according to claim 1 is characterized in that being provided with λ/4 wave plates and lenticule successively between described polarization beam apparatus (6) and the saturable absorber (7).
3. the self-starting mode locked fiber laser of the stable control of a kind of polarization state according to claim 2 is characterized in that being provided with optical collimator between described Polarization Controller (5) and the polarization beam apparatus (6).
4. the self-starting mode locked fiber laser of the stable control of a kind of polarization state according to claim 3 is characterized in that being provided with optical isolator between described Polarization Controller (5) and the optical collimator.
5. the self-starting mode locked fiber laser of the stable control of a kind of polarization state according to claim 4 is characterized in that being provided with optical collimator between described polarization beam apparatus (6) and the wavelength division multiplexer (2).
6. the self-starting mode locked fiber laser of the stable control of a kind of polarization state according to claim 1 is characterized in that being provided with Polarization Controller between described polarization beam apparatus (6) and the saturable absorber (7).
7. the self-starting mode locked fiber laser of the stable control of a kind of polarization state according to claim 6 is characterized in that being provided with optical isolator between described Polarization Controller (5) and the polarization beam apparatus (6).
8. a kind of polarization state according to claim 1 is stablized the self-starting mode locked fiber laser of control, it is characterized in that described gain fibre (3) is single mode, multimode fiber, double clad or photonic crystal, described non-gain fibre (4) also is single mode, multimode fiber, double clad or photonic crystal.
9. the self-starting mode locked fiber laser of the stable control of a kind of polarization state according to claim 1 is characterized in that described polarization beam apparatus (6) is space polarization beam apparatus or 2 * 2 full optical polarization beam splitter.
10. the self-starting mode locked fiber laser of the stable control of a kind of polarization state according to claim 1 is characterized in that described saturated absorbing body (7) has the speculum of saturated absorption characteristic ion for semiconductor saturable absorption speculum, the speculum that is coated with the saturated absorption material or doping.
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| CN 201320071772 CN203039222U (en) | 2013-02-07 | 2013-02-07 | A self-starting mode-locked fiber laser with a stably-controlled polarization state |
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| CN 201320071772 CN203039222U (en) | 2013-02-07 | 2013-02-07 | A self-starting mode-locked fiber laser with a stably-controlled polarization state |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151683A (en) * | 2013-02-07 | 2013-06-12 | 广东汉唐量子光电科技有限公司 | Self-starting mode-locked fiber laser for polarization state stability control |
| CN106058620A (en) * | 2016-05-30 | 2016-10-26 | 四川广正科技有限公司 | Multi-wavelength synchronous output fiber laser based on nonlinear polarization rotation mode locking |
| CN109478761A (en) * | 2016-06-03 | 2019-03-15 | Km实验室股份有限公司 | The starting and optimization of laser mode locking are used for using electronic control polarizer |
| CN112186490A (en) * | 2019-07-03 | 2021-01-05 | 苏州曼德特光电技术有限公司 | Automatic mode-locked laser and mode-locking parameter determination method and system thereof |
-
2013
- 2013-02-07 CN CN 201320071772 patent/CN203039222U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151683A (en) * | 2013-02-07 | 2013-06-12 | 广东汉唐量子光电科技有限公司 | Self-starting mode-locked fiber laser for polarization state stability control |
| CN106058620A (en) * | 2016-05-30 | 2016-10-26 | 四川广正科技有限公司 | Multi-wavelength synchronous output fiber laser based on nonlinear polarization rotation mode locking |
| CN106058620B (en) * | 2016-05-30 | 2019-02-22 | 四川广正科技有限公司 | Multi-wavelength synchronism output optical fiber laser based on nonlinear polarization rotation mode locking |
| CN109478761A (en) * | 2016-06-03 | 2019-03-15 | Km实验室股份有限公司 | The starting and optimization of laser mode locking are used for using electronic control polarizer |
| CN112186490A (en) * | 2019-07-03 | 2021-01-05 | 苏州曼德特光电技术有限公司 | Automatic mode-locked laser and mode-locking parameter determination method and system thereof |
| CN112186490B (en) * | 2019-07-03 | 2022-07-12 | 苏州曼德特光电技术有限公司 | Automatic mode-locked laser and mode-locking parameter determination method and system thereof |
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Effective date of registration: 20160512 Address after: 528400 Zhongshan Province Torch Development Zone, Guangdong Road, No. 6 Patentee after: Guangdong Hantang Quantum Photoelectric Technology Co., Ltd. Patentee after: GUANGDONG HANBANG 3D TECHNOLOGY CO., LTD. Address before: 528400 Zhongshan Province Torch Development Zone, Guangdong Road, No. 6 Patentee before: Guangdong Hantang Quantum Photoelectric Technology Co., Ltd. |
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