CN104134926A - Passive mode-locking Er-doped fiber laser based on gold nanoparticle saturable absorber - Google Patents

Passive mode-locking Er-doped fiber laser based on gold nanoparticle saturable absorber Download PDF

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Publication number
CN104134926A
CN104134926A CN201410311564.7A CN201410311564A CN104134926A CN 104134926 A CN104134926 A CN 104134926A CN 201410311564 A CN201410311564 A CN 201410311564A CN 104134926 A CN104134926 A CN 104134926A
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China
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doped fiber
er
coupler
wavelength division
division multiplexer
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CN201410311564.7A
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Chinese (zh)
Inventor
樊登峰
汪邵飞
白学坤
张倩武
曾祥龙
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上海大学
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Priority to CN201410311564.7A priority Critical patent/CN104134926A/en
Publication of CN104134926A publication Critical patent/CN104134926A/en

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Abstract

The invention relates to a passive mode-locking Er-doped fiber laser based on a gold nanoparticle saturable absorber. The passive mode-locking Er-doped fiber laser comprises a pumping source, a wavelength division multiplexer, Er-doped fiber, 1*2 coupler with coupling rate of 10:90, a polarization insensitive isolator, a nanometer gold locking mode device and a polarization controller, wherein the pumping source is connected with an input port a of the wavelength division multiplexer, an output port c of the wavelength division multiplexer is sequentially connected with the Er-doped fiber and an input port d of the 1*2 coupler, an output port f of the 1*2 coupler is sequentially connected with the polarization insensitive isolator, the nanometer gold locking mode device and the polarization controller, the polarization controller is connected with an input port b of the wavelength division multiplexer to form a closed loop, and an output port e of the 1*2 coupler is an output port of the whole laser. The passive mode-locking Er-doped fiber laser based on the gold nanoparticle saturable absorber is simple to manufacture, and is low in cost, high in applicability and simple and compact in structure, short pulse output can be achieved under a condition of low experiment.

Description

Passive mode locking erbium doped fiber laser based on gold nano grain saturable absorber

Technical field

The invention belongs to mode locked fiber laser field, be specifically related to a kind of passive mode locking erbium doped fiber laser based on gold nano grain saturable absorber device.

Background technology

Ultra-short pulse laser technology is one of the technology in forward position the most in modern age, it is short especially that ultrashort pulse has the duration, the feature that instantaneous power is very high, has very important application at aspects such as research field such as micro-processing, biomedical imaging, optical coherence tomographies.Active mode locking, passive mode locking, synchronous pump locked mode etc. have mainly been experienced in its technical development.In field of lasers, due to high, the integrated difficulty of active mode locking cost, passive mode-locking fiber laser simple and compact for structure produces ultrashort pulse and more and more receives publicity.In field of lasers, in laser chamber, adding saturable absorber is to obtain the way that ultrashort pulse is commonly used the most.But due to the Graphene as saturable absorber, carbon nano-tube complex manufacturing technology, high in cost of production, be difficult under general condition independently build saturable absorber mode-locked laser to obtain ultrashort pulse.

Summary of the invention

The defect existing for prior art, the object of the invention is to utilize novel substance to carry out locked mode, and a kind of passive mode locking erbium doped fiber laser based on gold nano grain saturable absorber device is provided, and expands the kind of mode-locked laser.

For achieving the above object, design of the present invention is as follows:

Gold nano grain saturable absorber is the saturable absorption device based on surface plasma resonance principle, in the time that pump light transmits in chamber, produce evanescent wave in optical taper district, but there is surface plasma-wave on surface in gold nano grain, in the time that evanescent wave and surface plasma-wave meet and produce surface plasma resonance, can produce surface plasmon resonance absorption, utilize its saturated absorption characteristic to carry out selectivity absorption to energy, thereby obtain mode locking pulse.

According to above-mentioned design, the present invention adopts following technical scheme:

A passive mode locking erbium doped fiber laser based on gold nano grain saturable absorber, comprises pumping source, wavelength division multiplexer, Er-doped fiber, the 1*2 coupler that coupling ratio is 10:90, polarization irrelevant isolator, nm of gold locked mode device and Polarization Controller; Described pumping source connects the input port a of wavelength division multiplexer, the delivery outlet c of described wavelength division multiplexer connects the input port d of Er-doped fiber and 1*2 coupler successively, the delivery outlet f of described 1*2 coupler connects polarization irrelevant isolator successively, nm of gold locked mode device and Polarization Controller, described Polarization Controller connects the input port b composition closed-loop path of wavelength division multiplexer; The output port that the delivery outlet e of described 1*2 coupler is whole laser.

Described pumping source is the optical semiconductor fibre laser of wavelength 980nm.

Described wavelength division multiplexer is 980/1550nm wavelength division multiplexer.

Described nm of gold locked mode device is made by gold nano grain and conical fiber, and gold nano grain is of a size of tens nanometer, utilizes the method for optics deposition that gold nano grain is adsorbed in to conical fiber Zhui district.

Compared with prior art, the present invention has the following advantages:

The present invention is based on the passive mode locking erbium doped fiber laser of gold nano grain saturable absorber, can produce stronger absorption to different wave length by the size that changes gold nano grain, thereby in very wide wave-length coverage, realize saturable absorption, can be for the laser of multiple gain media.The passive mode locking Er-doped fiber mode-locked laser that the present invention is based on gold nano grain saturable absorber is made simply, and cost is low, and applicability is strong.The present invention is simple and compact for structure, can realize short pulse output under lower experiment condition.

Brief description of the drawings

Fig. 1 is the structural representation of passive mode locking erbium doped fiber laser of the present invention.

Fig. 2 is nm of gold locked mode device structural representation.

Fig. 3 is the output spectrum of e end in coupler.

Fig. 4 is that in coupler, e end is exported by accessing the time-domain diagram in oscilloscope after photodetector.

Embodiment

Below in conjunction with accompanying drawing, specific embodiments of the invention are further described.

As shown in Figure 1, a kind of passive mode locking erbium doped fiber laser based on gold nano grain saturable absorber, it is characterized in that, comprise pumping source 1, wavelength division multiplexer 2, Er-doped fiber 3, the 1*2 coupler 4 that coupling ratio is 10:90, polarization irrelevant isolator 5, nm of gold locked mode device 6 and Polarization Controller 7; Described pumping source 1 connects the input port a of wavelength division multiplexer 2, the delivery outlet c of described wavelength division multiplexer 2 connects the input port d of Er-doped fiber 3 and 1*2 coupler 4 successively, the delivery outlet f of described 1*2 coupler 4 connects polarization irrelevant isolator 5 successively, nm of gold locked mode device 6 and Polarization Controller 7, described Polarization Controller 7 connects the input port b composition closed-loop path of wavelength division multiplexer 2; The output port that the delivery outlet e of described 1*2 coupler 4 is whole laser.

As shown in Figure 2, described nm of gold locked mode device 6 is made by gold nano grain and conical fiber, and gold nano grain is of a size of tens nanometer, utilizes the method for optics deposition that gold nano grain is adsorbed in to conical fiber Zhui district.Concrete manufacturing process is as follows: utilize fused conic clinker to go the standard single-mode fiber of coat to draw cone to one section, to draw the monomode fiber after cone to lie in a horizontal plane on slide, two ends utilize adhesive tape to fix, power tunable light source and its welding of then exporting with optical fiber, again by described nano-Au solution Di Yuzhui district, logical light, the light of propagating in fiber core i can be because optical-fiber deformation enters in covering j, and then a part of light spills covering and enters and become evanescent wave in solution, make to utilize the thermal effect of cone district's evanescent wave and solution effects, through after a period of time, optical taper district g covers a certain amount of gold nano grain, locked mode device completes.

In the present embodiment, described pumping source 1 is the optical semiconductor fibre laser of wavelength 980nm.Described wavelength division multiplexer 2 is 980/1550nm wavelength division multiplexer.In all interface unit optical fiber, except the Er-doped fiber 3 as gain fibre, other are standard single-mode fiber.All devices all adopt the mode of direct welding to connect, and realize all optical fibre structure.

The course of work of the present invention is as follows:

Pumping source 1 is inputted pump light the input port a of the wavelength division multiplexer 2 of 980/1550nm, then by the delivery outlet c of the wavelength division multiplexer 2 of 980/1550nm by the Er-doped fiber 3 as gain media in chamber, Er-doped fiber 3 stimulated radiations produce the continuous light of 1550nm wavelength.The delivery outlet f(90% of the 1*2 coupler 4 that continuous light is 10:90 by coupling ratio), enter polarization irrelevant isolator 5, ensure the unidirectional operation of endovenous laser, also ensure that 980nm pumping source 1 is not reflected light loss bad.In the time that laser passes through optical taper district g, due to the generation of evanescent wave, the nanogold particle in evanescent wave Hui Yuzhui district produces plasma resonance, cause that to the energy absorption of specific wavelength be non-linear absorption, because the whole laserresonator of the present invention is annular chamber, make continuous laser multiple oscillation in chamber, and due to the effect of its saturable absorption, the stable mode-lock status of final formation, i.e. the pulse of stable output.The delivery outlet e(10% of the coupler 4 that pulse laser is 10:90 by coupling ratio) output.The fine setting of Polarization Controller 7 to mode-lock status, makes to produce more desirable pulse.As being respectively, Fig. 3 and Fig. 4 utilize nm of gold locked mode device 6 to enter frequency domain spectrogram and the time domain pulse diagram of delivery outlet e after mode-lock status.Its three dB bandwidth of the spectrum showing in Fig. 3 is approximately 1.7nm, and the pulse interval in Fig. 4 is that the total length of chamber inner fiber determines, is specially the propagation velocity of pulse interval=chamber length/light in optical fiber by long decision the in chamber of the annular chamber of whole laser.

Claims (3)

1. the passive mode locking erbium doped fiber laser based on gold nano grain saturable absorber, it is characterized in that, comprise pumping source (1), wavelength division multiplexer (2), Er-doped fiber (3), coupling ratio is the 1*2 coupler (4) of 10:90, polarization irrelevant isolator (5), nm of gold locked mode device (6) and Polarization Controller (7); Described pumping source (1) connects the input port a of wavelength division multiplexer (2), the delivery outlet c of described wavelength division multiplexer (2) connects the input port d of Er-doped fiber (3) and 1*2 coupler (4) successively, the delivery outlet f of described 1*2 coupler (4) connects polarization irrelevant isolator (5) successively, nm of gold locked mode device (6) and Polarization Controller (7), described Polarization Controller (7) connects the input port b composition closed-loop path of wavelength division multiplexer (2); The output port that the delivery outlet e of described 1*2 coupler (4) is whole laser.
2. the passive mode locking erbium doped fiber laser based on gold nano grain saturable absorber according to claim 1, is characterized in that, described pumping source (1) is the optical semiconductor fibre laser of wavelength 980nm.
3. the passive mode locking erbium doped fiber laser based on gold nano grain saturable absorber according to claim 1, it is characterized in that, described nm of gold locked mode device (6) is made by gold nano grain and conical fiber, gold nano grain is of a size of tens nanometer, utilizes the method for optics deposition that gold nano grain is adsorbed in to conical fiber Zhui district.
CN201410311564.7A 2014-07-02 2014-07-02 Passive mode-locking Er-doped fiber laser based on gold nanoparticle saturable absorber CN104134926A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104836108A (en) * 2015-05-15 2015-08-12 华南师范大学 Broadband saturable absorber, preparation method thereof and laser pulse based on device
CN106129786A (en) * 2016-07-18 2016-11-16 电子科技大学 Tunable dual wavelength mode locked fiber laser based on tapered fiber
CN107039879A (en) * 2017-04-28 2017-08-11 衡阳师范学院 Passive mode-locking vector soliton fiber laser and the method for output vector orphan

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102104231A (en) * 2011-01-06 2011-06-22 中国科学院上海光学精密机械研究所 Graphite Raman locked mode laser
US20110222562A1 (en) * 2009-07-24 2011-09-15 Advalue Photonics, Inc. Mode-Locked Two-Micron Fiber Lasers
CN103401133A (en) * 2013-07-12 2013-11-20 吉林大学 Saturable absorber based on plasmon axial vibration mode

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110222562A1 (en) * 2009-07-24 2011-09-15 Advalue Photonics, Inc. Mode-Locked Two-Micron Fiber Lasers
CN102104231A (en) * 2011-01-06 2011-06-22 中国科学院上海光学精密机械研究所 Graphite Raman locked mode laser
CN103401133A (en) * 2013-07-12 2013-11-20 吉林大学 Saturable absorber based on plasmon axial vibration mode

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104836108A (en) * 2015-05-15 2015-08-12 华南师范大学 Broadband saturable absorber, preparation method thereof and laser pulse based on device
CN106129786A (en) * 2016-07-18 2016-11-16 电子科技大学 Tunable dual wavelength mode locked fiber laser based on tapered fiber
CN107039879A (en) * 2017-04-28 2017-08-11 衡阳师范学院 Passive mode-locking vector soliton fiber laser and the method for output vector orphan
CN107039879B (en) * 2017-04-28 2019-07-16 衡阳师范学院 The method of passive mode-locking vector soliton fiber laser and output vector orphan

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Application publication date: 20141105