CN104836108A - Broadband saturable absorber, preparation method thereof and laser pulse based on device - Google Patents
Broadband saturable absorber, preparation method thereof and laser pulse based on device Download PDFInfo
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- CN104836108A CN104836108A CN201510249862.2A CN201510249862A CN104836108A CN 104836108 A CN104836108 A CN 104836108A CN 201510249862 A CN201510249862 A CN 201510249862A CN 104836108 A CN104836108 A CN 104836108A
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Abstract
The invention provides a broadband saturable absorber comprising a gold nanorod and a surface decoration material which coats the surface of the gold nanorod. A core-shell structure composite nano material is formed by the gold nanorod and the surface decoration material. According to the broadband saturable absorber, the damage threshold of a saturable absorber is greatly improved, and the stable operation of an ultrafast pulse can be realized.
Description
Technical field
The present invention relates to laser technology field.In particular to a kind of broadband saturable absorber based on gold nanorods/silicon dixoide nucleocapsid structure composite nano materials, preparation method and the pulse laser based on this device.
Background technology
Passive mode-locking fiber laser is that the generation of ultrashort pulse provides a good platform, and it all has huge using value in industrial circle or basic research etc.In order to realize passive mode locking, in fiber laser, saturable absorber is a very crucial device, and therefore, in order to develop high performance saturable absorber, each research group has paid very large effort.Up to now, utilize class saturable absorber and true saturable absorber, in fiber laser, all obtain ultrashort pulse.Class saturable absorber generally adopts nonlinear effect to realize, as nonlinear polarization rotation technology (NPR), and Image magnify annular mirror technology (NALM).Though these two kinds of technology are easy and simple to handle, application is comparatively wide, but when realizing ultrafast mode locking pulse, require relatively stricter to polarization state in chamber, the change of surrounding environment can affect to laser polarization state in optical fiber, therefore there is environment unsteadiness factor.And adopt true saturable absorber, then can overcome the shortcoming of Mode-locking For Lasers environment instability, make to export pulse more stable.Particularly adopt nano material to be used for the generation of fiber laser ultrafast pulse as saturable absorber, obtain intensive research especially in recent years.
Along with the deep development of nanometer technology, gold nano-rod particles is owing to having unique local surface plasmon resonance characteristic and its application prospect in fields such as biochemistry sensing, surface enhancement Raman spectroscopy, biomedicine, imaging technique, optical information storage and nanophotonics, and the extensive light received from research fields such as materials chemistry, biology, optics and laser technologies is noted.Gold nanorods waits on longitudinal surface has obvious saturable absorption effect from resonance place, and the longitudinally surface of gold nanorods waits the position from formant can carry out flexible by the draw ratio changing gold nanorods, even it can be moved to region of ultra-red from visible region, this shows that the saturable absorption wave band of gold nanorods can regulate on a large scale.In addition, gold nanorods is except having obvious saturable absorption characteristic, and it has high third-order nonlinear characteristic in optical band.This makes gold nanorods be hopeful very much to be made into the high-performance saturable absorber having high non-linearity and broadband saturable absorption characteristic.Therefore, gold nanorods is as saturable absorber and be applied in fiber laser, receives the extensive concern of various countries scientist.
At present, the research of gold nanorods saturable absorber is had been reported.One of correlation technique, people (" the Passively mode-locking induced by gold nanorods inerbium-doped fiber lasers " Appl.Phys.Lett.103 (4) such as Jilin University Qin Guan bodyguard, pp:041105 2013) gold nanorods solution is mixed with polyvinyl alcohol, produce polyvinyl alcohol-gold nanorods polymer-type saturable absorber, in erbium doped fiber laser, obtain centre wavelength is 1561nm, 3dB spectrum width is 1.17nm, and pulsewidth is the mode locking pulse of 12ps.But, in this study, due to the photo-thermal effect that gold nanorods is strong, make based on polyvinyl alcohol-gold nanorods polymer-type saturable absorber damage threshold lower, be unfavorable for the ultrashort pulse running of bearing high-peak power, make in this experiment, only can obtain the mode locking pulse of picosecond magnitude, and mode-locked spectrum can not show typical anomalous dispersion territory orphan's mode-locked spectrum, and namely Kelly sideband can not significantly show.Therefore based on polyvinyl alcohol-gold nanorods polymer-type saturable absorber is applied limited in actual passive mode-locking fiber laser.
Correlation technique two, South China Normal University Xu Wen becomes seminar (" Microfiber-based goldnanorods as saturable absorber for femtosecond pulse generation in a fiberlaser " Appl.Phys.Lett.105 (16), pp:1611072014) gold nanorods is deposited on micro-nano fiber, produce micro-nano fiber-gold nano rod type saturable absorber, in erbium doped fiber laser, obtain centre wavelength is 1552nm, spectrum width is 3.07nm, and pulsewidth is the mode locking pulse of 887fs.In this study, make use of evanscent field in micro-nano fiber and gold nanorods interacts, thus improve the damage threshold based on gold nanorods saturable absorber, effectively improve the performance of saturable absorber.But, also there is certain deficiency in actual use in this micro-nano fiber-gold nano rod type saturable absorber, show: 1, micro-nano fiber is to several micron by naked fine fused biconical taper, easily fracture in actual use, make this device lack flexible operating and integrated difficulty.2, the process realizing gold nanorods light deposition on micro-nano fiber is more loaded down with trivial details, is difficult to accomplish accurate control.3, the saturable absorber made not easily is preserved, and practicality and application prospect are also short of to some extent.
Summary of the invention
The object of the present invention is to provide a kind of gold nanorods finishing composite material saturable absorber of high damage threshold, preparation method and the pulse laser based on this device, to solve the problem.In order to develop stable performance, the saturable absorber based on gold nanorods easy to use, the present invention is achieved in that
A kind of broadband saturable absorber, comprises gold nanorods and is coated on the face finish material on described gold nanorods surface, and described gold nanorods and described face finish material form the composite nano materials of nucleocapsid structure.
Broadband of the present invention saturable absorber, composite nano materials described in it and film forming agent are by mixing, together with the methods combining of physics or chemical doping, produce film-type broadband saturable absorber, then utilize ring flange, described broadband saturable absorber is clipped in the saturable absorber making laser between two fiber end faces.
Broadband of the present invention saturable absorber, reduces the photo-thermal effect of gold nanorods, improves the damage threshold of gold nanorods saturable absorber.By modifying described gold nano-rod particles surface, forming core-shell structure composite nano material, utilizing the non-linear saturable absorption effect of this core-shell structure composite nano material to realize laser mode locking.Utilize nucleocapsid structure to improve the damage threshold of saturable absorber.While the optical property that preserving capital nanometer rods itself is superior, significantly improve the photo and thermal stability of gold nanorods.
The present invention also provides a kind of method preparing described broadband saturable absorber, comprises following steps:
Step one, softex kw and gold chloride are joined in deionized water, add sodium borohydride solution after being uniformly mixed and form gold and plant liquid;
Step 2, by softex kw, gold chloride, nitric acid joins in deionized water, add after being uniformly mixed ascorbic acid solution formed growth-promoting media;
Step 3, described growth-promoting media and described gold planted after liquid mixes and stir, carry out centrifugal after water-bath, obtain gold nanorods solution;
Step 4, by above-mentioned gold nanorods solution by add ammoniacal liquor stir, make the pH value of solution be 10;
Step 5, add tetraethyl orthosilicate solution, after placement, obtain the solution of gold nanorods/silicon dixoide nucleocapsid structure composite nano materials;
Step 6, get some parts of gold nanorods/silicon dixoide nucleocapsid structure nano particles solution and mix with poly-vinyl alcohol solution, mixed liquor carries out ultrasonic vibration;
Step 7, by after the moisture evaporation among mixed liquor, form the broadband saturable absorber diaphragm of gold nanorods/silicon dixoide nucleocapsid structure composite nano materials.
The present invention also provides a kind of pulse laser based on described broadband saturable absorber, comprising: pumping source resonant cavity, wherein, is provided with described broadband saturable absorber in resonant cavity.
The present invention adopts the non-linear saturable absorption effect of core-shell structure composite nano material to realize the passive mode locking of laser, specific works principle is: the saturable absorber that the gold nanorods of surface modification is prepared into is true saturable absorber material, few to strong light absorption, many to weak absorption, therefore, pulse, in intracavity round trip process, is all narrowed through broadband of the present invention saturable absorber at every turn, finally realize passive mode locking, obtain ultrashort pulse and export.
Particularly, the gold nanorods that described gold nanorods is 5.5 ~ 16.5 by draw ratio mixes, and combines equably with film forming agent.
The gold nanorods of various different draw ratio is mixed, forms broadband saturable absorber, regulate saturable absorption wave band on a large scale, thus realize the pulse laser of tunable wave length.Therefore, the gold nanorods of described surface modification is applied in ultrafast fiber laser as saturable absorber, can obtain photo and thermal stability more better than gold nanorods, higher damage threshold.
Particularly, described face finish material is silicon dioxide.
Specifically, the main material that the present invention adopts is gold nanorods/silicon dixoide nucleocapsid structure composite nano materials, this material is by using silicon dioxide to carry out finishing to gold nanorods, form gold nanorods/silicon dixoide nucleocapsid structure composite nano materials, improve the photo and thermal stability of gold nanorods.This is that under high luminous power, silica shell can keep its shape because the fusing point of one side silicon dioxide is higher, can be used as a mould and makes gold nanorods core maintain its club shaped structure; On the other hand, silicon dioxide has higher thermal diffusion coefficient, avoid the accumulation of heat on gold nano-rod particles, be conducive to the dispersion of heat, the gold nanorods simultaneously modified through silica surface can the superior optical property of preserving capital nanometer rods unmodified.
Particularly, described film forming agent is the mixture of one or more of polyvinyl alcohol, polymethyl methacrylate or sodium carboxymethylcellulose.
Particularly, described resonant cavity is annular chamber, connects wavelength division multiplexer, gain fibre, polarization irrelevant isolator, the first Polarization Controller, broadband saturable absorber, the second Polarization Controller and coupler successively form ring resonator with optical fiber; Pumping source is connected with the another port of wavelength division multiplexer by optical fiber.
Particularly, described resonant cavity is linear cavity, connect completely reflecting mirror, wavelength division multiplexer, gain fibre, Polarization Controller, broadband saturable absorber and 98% speculum successively with optical fiber and form linear resonant cavity, pumping source is connected with the another port of wavelength division multiplexer by optical fiber.
Particularly, described gain fibre is Er-doped fiber; The wavelength of pumping source is 980nm, and the centre wavelength of wavelength division multiplexer is 1550nm.
Particularly, described gain fibre is Yb dosed optical fiber; The wavelength of pumping source is 980nm, and the centre wavelength of wavelength division multiplexer is 1064nm.
Particularly, for realizing tunable wave length, the gain fibre that needed for selecting, wavelength is corresponding and pumping source, according to the gain spectral of gain fibre, choose corresponding wavelength division multiplexer, Polarization Controller, polarization irrelevant isolator, coupler, tail optical fiber type and tail optical fiber length.
Particularly, the connection between device adopts the method for the mutual welding of tail optical fiber.
Particularly, gain fibre can adopt Er-doped fiber or Yb dosed optical fiber.
In sum, the technique effect that the present invention realizes is:
(1) increase substantially the damage threshold of saturable absorber, femtosecond magnitude high-peak power can have been born, realize the stable running of ultrafast pulse;
(2) the saturable absorption wavelength of described saturable absorber comes tuning by the draw ratio changing gold nanorods, has broadband saturable absorption characteristic; The gold nanorods of different draw ratio is integrated on same diaphragm, and when needs tuning wavelength/wave band, only changing pumping source, wavelength division multiplexer and gain fibre, can to realize wide range of wavelengths/wave band tuning.
This is that a kind of optical fiber is compatible, the saturable absorption device of membrane structure, stable performance, make simple, cost is low, during use, only needs to invest fiber end face, simple, convenient.
Accompanying drawing explanation
Fig. 1 is the transmission electron microscope figure of preparation method's gained gold nanorods of the broadband saturable absorber utilizing a specific embodiment of the present invention;
Fig. 2 is the transmission electron microscope figure of the preparation method's gained gold nanorods/silicon dixoide nucleocapsid structure nanometer rods of the broadband saturable absorber utilizing a specific embodiment of the present invention;
Fig. 3 utilizes the preparation method of the broadband saturable absorber of a specific embodiment of the present invention to obtain the structure chart of laser broadband saturable absorber and absorber can be protected in the broadband sticked on fiber end face;
Fig. 4 is the broadband saturable absorber utilizing the preparation method of the broadband saturable absorber of a specific embodiment of the present invention to obtain based on gold nanorods/silicon dixoide nucleocapsid structure composite nano materials;
Fig. 5 is the annular chamber fiber pulse laser structure principle chart of the broadband saturable absorber of gold nanorods/silicon dixoide nucleocapsid structure composite nano materials based on the first embodiment of the present invention;
Fig. 6 is the shown pulse sequence diagram based on the annular chamber Er-doped fiber pulse laser of broadband saturable absorber of Fig. 5 of experiment measuring;
Fig. 7 is the shown autocorrelation function analyzer survey map based on the annular chamber Er-doped fiber pulse laser of broadband saturable absorber of Fig. 5 of experiment measuring;
Fig. 8 is the shown spectrogram based on broadband saturable absorber annular chamber Er-doped fiber pulse laser of Fig. 5 of experiment measuring;
Fig. 9 is the pulse sequence diagram based on naked gold nanorods saturable absorber annular chamber Er-doped fiber pulse laser of experiment measuring;
Figure 10 is the autocorrelation function analyzer survey map based on naked gold nanorods saturable absorber annular chamber Er-doped fiber pulse laser of experiment measuring;
Figure 11 is the spectrogram based on naked gold nanorods saturable absorber annular chamber Er-doped fiber pulse laser of experiment measuring;
Figure 12 is the pulse sequence diagram based on broadband saturable absorber annular chamber Yb dosed optical fiber pulse laser of the second embodiment of the present invention of experiment measuring;
Figure 13 is the shown autocorrelation function analyzer survey map based on broadband saturable absorber annular chamber Yb dosed optical fiber pulse laser of Figure 12 of experiment measuring;
Figure 14 is the spectrogram based on broadband saturable absorber annular chamber Yb dosed optical fiber pulse laser shown in Figure 12 of experiment measuring;
Figure 15 is the linear cavity fiber pulse laser structure principle chart of the broadband saturable absorber based on gold nanorods/silicon dixoide nucleocapsid structure composite nano materials of the third embodiment of the present invention;
Figure 16 is the pulse sequence diagram of the linear cavity Er-doped fiber pulse laser based on broadband saturable absorber shown in Figure 15 of experiment measuring;
Figure 17 is the autocorrelation function analyzer survey map of the linear cavity Er-doped fiber pulse laser based on broadband saturable absorber shown in Figure 15 of experiment measuring;
Figure 18 is the spectrogram of the linear cavity Er-doped fiber pulse laser based on broadband saturable absorber shown in Figure 15 of experiment measuring;
Figure 19 is the pulse sequence diagram of the linear cavity Yb dosed optical fiber pulse laser based on broadband saturable absorber of the fourth embodiment of the present invention of experiment measuring;
Figure 20 is the autocorrelation function analyzer survey map of the linear cavity Yb dosed optical fiber pulse laser based on broadband saturable absorber shown in Figure 19 of experiment measuring;
Figure 21 is the spectrogram of the linear cavity Yb dosed optical fiber pulse laser based on broadband saturable absorber shown in Figure 19 of experiment measuring.
Label declaration in accompanying drawing:
101, optical fiber splice; 102, broadband saturable absorber diaphragm;
103, ring flange; 104, optical fiber splice; 201, pumping source;
202, wavelength division multiplexer; 203, gain fibre; 204, polarization irrelevant isolator;
205, the first Polarization Controller; 206, broadband saturable absorber; 207, the second Polarization Controller;
208, output coupler; 301, completely reflecting mirror; 302, pumping source;
303, wavelength division multiplexer; 304, gain fibre; 305, Polarization Controller;
306, broadband saturable absorber; 307,98% speculum.
Embodiment
Also by reference to the accompanying drawings the preparation method of the broadband saturable absorber based on gold nanorods/silicon dixoide nucleocapsid structure composite nano materials is described in further detail below by specific embodiment.
The softex kw (CTAB) of step one, 5mL 0.2mol/L and the gold chloride (HAuCl of 250 μ L0.01mol/L
4) join in the ultra-pure deionized water of 5mL, stir 30 seconds Homogeneous phase mixing; Add the sodium borohydride solution of 0.6mL 0.01mol/L, stir 2 minutes, until solution becomes dark brown.Mark this solution for gold kind liquid;
Step 2, by the softex kw (CTAB) of 30mL 0.2mol/L, the gold chloride (HAuCl of 1.5mL 0.01mol/L
4), the nitric acid (HNO of 40 μ L 0.5mol/L
3) join in the ultra-pure deionized water of 25mL; And then add 360 μ L 0.08mol/L ascorbic acid (AA) solution, stir 2 minutes, until solution becomes colorless.Marking this solution is growth-promoting media.
Step 3, preparation three beakers are designated as beaker A, beaker B, beaker C respectively, and transferred to respectively by growth-promoting media in these three beakers, beaker solution A is 5mL, and beaker B solution is 5mL, and beaker C solution is 45mL.Get gold and plant liquid 400 μ L, be transferred in beaker A, stir 5 seconds; Then get beaker solution A 400 μ L, be transferred in beaker B, stir 5 seconds; Finally getting beaker B solution 4mL is transferred in beaker C, stirs 5 seconds.Beaker C solution is placed in the water-bath of 28 DEG C and is reacted 24 hours.Carry out centrifugal to beaker C solution, centrifuge speed is 5000 revs/min, and centrifugation time is 15 minutes, centrifugal 2 times.The solution obtained is gold nanorods solution, and as shown in Figure 2, draw ratio is 5.5 ~ 16.5:1 to its Electronic Speculum figure.
Step 4, get the above-mentioned gold nanorods solution of 20mL in beaker, add the ammoniacal liquor of 150 μ L 28wt%, stir, make the pH value of solution be 10;
Step 5, add tetraethyl orthosilicate (TEOS) solution of 4mL 8mmol/L, point to add for 4 times, each 1.5mL, interval half an hour.Add complete, after solution places 12 hours, the solution obtained is the solution of gold nanorods/silicon dixoide nucleocapsid structure composite nano materials, and as shown in Figure 3, wherein silica shell layer thickness is about 22nm to its Electronic Speculum figure.
Step 6, mixed by mole ratio 1:12 with film forming agent polyvinyl alcohol (PVA) solution by gold nanorods/silicon dixoide nucleocapsid structure nano particles solution, mixed liquor is put into ultrasonic machine and is mixed 1 hour by ultrasonic vibration;
Step 7, by mixed liquor down on clean sheet glass, after moisture natural evaporation, formed gold nanorods/silicon dixoide nucleocapsid structure composite nano materials film, as shown in Figure 4.This film is cut into the rectangular sheet of 1 × 1.5mm, stick on fiber end face, pass through ring flange, by gold nanorods/silicon dixoide nucleocapsid structure composite nano materials film-clamp between two fiber end faces, form gold nanorods/silicon dixoide nucleocapsid structure composite nano materials saturable absorber, as shown in Figure 1.It should be noted that: in gold nanorods/silicon dixoide nucleocapsid structure composite nano materials saturable absorber manufacturing process, film forming agent also can use polymethyl methacrylate (PMMA) and sodium carboxymethylcellulose (NaCMC) to substitute.
Be described in further detail below in conjunction with first embodiment of accompanying drawing to the fiber pulse laser of the broadband saturable absorber based on gold nanorods/silicon dixoide nucleocapsid structure composite nano materials.
Fiber pulse laser in the present embodiment adopts ring cavity structure, as shown in Figure 5, gain fibre 203 chooses Er-doped fiber, according to the characteristic of gain fibre, the pumping wavelength selecting pumping source 201 is 980nm, the centre wavelength of wavelength division multiplexer 202 is 1550nm, polarization irrelevant isolator 204, first Polarization Controller 205 and the second Polarization Controller 207, coupler 208, broadband of the present invention saturable absorber 206 is accessed in the Er-doped fiber pulse laser of 1550nm, the order of each device according to Fig. 5 is connected by the method for welding.The characteristic of measuring optical fiber laser Output of laser is carried out at the output port join dependency instrument of coupler 208.Regulate pump power, can observe to swash on oscilloscope and penetrate pulse, as shown in Figure 6; The single pulse width that autocorrelation function analyzer measures, as shown in Figure 7; Spectrometer can be seen corresponding spectrum, as shown in Figure 8.Utilize broadband of the present invention saturable absorber, the mode locking pulse of obtainable 1550nm, its repetition rate is 6.17MHz, and pulse duration is 769fs, and spectrum three dB bandwidth is 3.45nm.
As a comparison, we provide naked gold nanorods as the laser characteristics measured by saturable absorber, the sharp pulse recurrence rate of penetrating that oscilloscope is observed is 4MHz, as shown in Figure 9; Autocorrelation function analyzer being measured single pulse width is 13ps, as shown in Figure 10; Spectrometer measurement spectrum three dB bandwidth is 0.35nm, as shown in figure 11.Can find out, the quality of mode-locked obtained with gold nanorods/silicon dixoide nucleocapsid structure composite nano materials is better, and pulse duration reaches femtosecond magnitude, and as shown in Figure 7, and the mode locking pulse width that naked gold nanorods material obtains is picosecond magnitude; In addition, in anomalous dispersion erbium doped fiber laser, power is higher, occurs that Kelly sideband is more obvious and order is also more in mode-locked spectrum, has occurred symmetrical obvious 3 grades of Kelly sidebands in the mode-locked spectrum of Fig. 7, contrast Figure 11, utilize naked gold nanorods as saturable absorber, because its damage threshold is lower, cause quality of mode-locked poor, mode-locked spectrum can not show typical Kelly sideband, and can not locked mode for a long time.
Being illustrated by the present embodiment utilizes broadband of the present invention saturable absorber can realize 1.06 micron waveband ultrafast pulse modelocked fiber pulse lasers.
Be described in further detail below in conjunction with second embodiment of accompanying drawing to the fiber pulse laser of the broadband saturable absorber based on gold nanorods/silicon dixoide nucleocapsid structure composite nano materials.
Structure and first embodiment of laser employing in the present embodiment are similar, adopt annular chamber and use broadband of the present invention saturable absorber, gain fibre 203 is replaced by Yb dosed optical fiber, and select centre wavelength at the wavelength division multiplexer 202 of 1064nm, polarization irrelevant isolator 204, first Polarization Controller 205, second Polarization Controller 207 and coupler 208, each device is carried out welding according to the order of Fig. 5.Pass through the characteristic of fiber laser Output of laser in observation of use instrument the present embodiment at the output port of coupler: when connecting oscilloscope, oscilloscope can be observed swash and penetrate pulse, as shown in figure 12; When connecting autocorrelation function analyzer, single pulse width can be measured, as shown in figure 13; And corresponding spectrum can be seen on spectrometer, as shown in figure 14.Utilize the broadband saturable absorber based on gold nanorods/silicon dixoide nucleocapsid structure composite nano materials of the present invention, can obtain the mode locking pulse of 1064nm, its repetition rate is 8.21MHz, and pulse duration is 16ps, and spectrum three dB bandwidth is 2.3nm.
Be described in further detail below in conjunction with the fiber pulse laser of accompanying drawing to the 3rd embodiment of the broadband saturable absorber based on gold nanorods/silicon dixoide nucleocapsid structure composite nano materials.
Fiber laser in the present embodiment adopts linear cavity structure, as shown in figure 15, gain fibre 304 chooses Er-doped fiber, the wavelength of pumping source 302 is 980nm, centre wavelength is the completely reflecting mirror 301 of 1550nm, Polarization Controller 305,98% speculum 307 and saturable absorber of the present invention, and each device carries out welding according to the order of Figure 15.The characteristic that fiber laser Output of laser observed by instrument is connected at the output port of linear cavity laser.When connecting oscilloscope, oscilloscope can be observed swash and penetrating pulse, as shown in figure 16; When connecting autocorrelation function analyzer, single pulse width can be measured as shown in figure 17; And corresponding spectrum can be seen on spectrometer, as shown in figure 18.Utilize the broadband saturable absorber based on gold nanorods/silicon dixoide nucleocapsid structure composite nano materials of the present invention, can obtain the mode locking pulse that wavelength is 1550nm, its repetition rate is 5.8MHz, and pulse duration is 866fs, and spectrum three dB bandwidth is 3.3nm.
The fiber pulse laser utilizing broadband of the present invention saturable absorber can realize ultrafast pulse locked mode is described by the present embodiment.
Be described in further detail below in conjunction with the fiber pulse laser of accompanying drawing to the 4th embodiment of the broadband saturable absorber based on gold nanorods/silicon dixoide nucleocapsid structure composite nano materials.
Structure and the 3rd embodiment of laser employing in the present embodiment are similar, adopt linear cavity and use broadband of the present invention saturable absorber, gain fibre (304) is changed to Yb dosed optical fiber, and select centre wavelength to be the completely reflecting mirror 301 of 1064nm, Polarization Controller 305,98% speculum 307 and saturable absorber of the present invention, each device carries out welding according to the order of Figure 15.The characteristic that fiber laser Output of laser observed by instrument is connected at the output port of linear cavity laser.When connecting oscilloscope, oscilloscope can be observed swash and penetrating pulse, as shown in figure 19; When connecting autocorrelation function analyzer, single pulse width can be measured as shown in figure 20; And corresponding spectrum can be seen on spectrometer, as shown in figure 21.Utilize the broadband saturable absorber based on gold nanorods/silicon dixoide nucleocapsid structure composite nano materials of the present invention, the wavelength that can obtain is the mode locking pulse of 1064nm, its repetition rate is 3.75MHz, and pulse duration is 21ps, and spectrum three dB bandwidth is 3.1nm.
In sum, broadband saturable absorber based on gold nanorods/silicon dixoide nucleocapsid structure composite nano materials of the present invention not only possesses broadband saturable absorption effect, and there is better photo and thermal stability, damage threshold is high, is suitable for the ultrafast pulse fiber laser of high-peak power.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a broadband saturable absorber, is characterized in that, comprising:
Gold nanorods;
For described gold nanorods is wrapped up with the face finish material forming nucleocapsid structure; And
Film forming agent,
Described film forming agent combines with the gold nanorods after face finish material is modified, and forms film-type broadband saturable absorber.
2. broadband according to claim 1 saturable absorber, is characterized in that, described gold nanorods is the gold nanorods of single draw ratio gold nanorods or different draw ratio mixing composition, and wherein, the scope of draw ratio is 5.5 ~ 16.5:1.
3. broadband according to claim 1 saturable absorber, is characterized in that, described face finish material is silicon dioxide.
4. broadband according to claim 1 saturable absorber, is characterized in that, described film forming agent is the mixture of one or more of polyvinyl alcohol, polymethyl methacrylate or sodium carboxymethylcellulose.
5. prepare a method for broadband as claimed in claim 1 saturable absorber, it is characterized in that comprising following steps:
Step one, softex kw and gold chloride are joined in deionized water, add sodium borohydride solution after being uniformly mixed and form gold and plant liquid;
Step 2, by softex kw, gold chloride, nitric acid joins in deionized water, add after being uniformly mixed ascorbic acid solution formed growth-promoting media;
Step 3, described growth-promoting media and described gold planted after liquid mixes and stir, carry out centrifugal after water-bath, obtain gold nanorods solution;
Step 4, by above-mentioned gold nanorods solution by add ammoniacal liquor stir, make the pH value of solution be 10;
Step 5, add tetraethyl orthosilicate solution, after placement, obtain the solution of gold nanorods/silicon dixoide nucleocapsid structure composite nano materials;
Step 6, get some parts of gold nanorods/silicon dixoide nucleocapsid structure nano particles solution and mix with poly-vinyl alcohol solution, mixed liquor carries out ultrasonic vibration;
Step 7, by after the moisture evaporation among mixed liquor, form the broadband saturable absorber diaphragm of gold nanorods/silicon dixoide nucleocapsid structure composite nano materials.
6. based on the pulse laser of the broadband saturable absorber according to claim arbitrary in claim 1-4, it is characterized in that, comprise: pumping source resonant cavity, wherein, in resonant cavity, be provided with the broadband saturable absorber as described in claim arbitrary in claim 1-4.
7. pulse laser according to claim 6, it is characterized in that, described resonant cavity is annular chamber, connects wavelength division multiplexer (202), gain fibre (203), polarization irrelevant isolator (204), the first Polarization Controller (205), broadband saturable absorber (206), the second Polarization Controller (207) and coupler (208) successively form ring resonator with optical fiber; Pumping source (201) is connected by the another port of optical fiber with wavelength division multiplexer (202).
8. pulse laser according to claim 6, it is characterized in that, described resonant cavity is linear cavity, connect completely reflecting mirror (301), wavelength division multiplexer (303), gain fibre (304), Polarization Controller (305), broadband saturable absorber (306) and 98% speculum (307) successively with optical fiber and form linear resonant cavity, pumping source (302) is connected by the another port of optical fiber with wavelength division multiplexer (303).
9. the pulse laser according to claim 7 or 8, is characterized in that, described gain fibre (203) is Er-doped fiber; The wavelength of pumping source (201) is 980nm, and the centre wavelength of wavelength division multiplexer (202) is 1550nm.
10. the pulse laser according to claim 7 or 8, is characterized in that, described gain fibre (203) is Yb dosed optical fiber; The wavelength of pumping source (201) is 980nm, and the centre wavelength of wavelength division multiplexer (202) is 1064nm.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105428991A (en) * | 2015-12-16 | 2016-03-23 | 中国科学院西安光学精密机械研究所 | Absorption device for solid mode-locked laser and preparation method of absorption device |
| CN107931627A (en) * | 2017-11-10 | 2018-04-20 | 厦门斯贝克科技有限责任公司 | A kind of ultra-thin shell isolated gold nanorods synthetic method |
| CN108199252A (en) * | 2018-01-24 | 2018-06-22 | 深圳大学 | Saturable absorber and preparation method thereof and ultrafast laser with active-passive lock mould |
| CN108593121A (en) * | 2018-04-03 | 2018-09-28 | 上海交通大学 | Ultrashort pulse autocorrelation measurement device and measurement method |
| CN109861062A (en) * | 2019-04-08 | 2019-06-07 | 华南师范大学 | Saturable absorber test macro and saturable absorber test method |
| CN110061408A (en) * | 2019-06-04 | 2019-07-26 | 四川大学 | It mixes the preparation of chromium selenizing zinc nanoparticles saturable absorber and its constitutes full optical fiber Q-switched laser |
| CN110104674A (en) * | 2019-05-13 | 2019-08-09 | 长春理工大学 | Copper doped gallium oxygen nonlinear material, saturable absorber and Q-switched pulse laser |
| CN111463651A (en) * | 2020-03-25 | 2020-07-28 | 吉林大学 | Tuning method for working wavelength of ultrashort pulse fiber laser |
| CN113193470A (en) * | 2021-04-29 | 2021-07-30 | 吉林工程技术师范学院 | Preparation method of saturable absorber and fiber laser |
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| CN105428991B (en) * | 2015-12-16 | 2019-06-28 | 中国科学院西安光学精密机械研究所 | A kind of solid mode-locked laser absorbs the preparation method of device |
| CN105428991A (en) * | 2015-12-16 | 2016-03-23 | 中国科学院西安光学精密机械研究所 | Absorption device for solid mode-locked laser and preparation method of absorption device |
| CN107931627A (en) * | 2017-11-10 | 2018-04-20 | 厦门斯贝克科技有限责任公司 | A kind of ultra-thin shell isolated gold nanorods synthetic method |
| CN108199252A (en) * | 2018-01-24 | 2018-06-22 | 深圳大学 | Saturable absorber and preparation method thereof and ultrafast laser with active-passive lock mould |
| CN108593121A (en) * | 2018-04-03 | 2018-09-28 | 上海交通大学 | Ultrashort pulse autocorrelation measurement device and measurement method |
| CN109861062A (en) * | 2019-04-08 | 2019-06-07 | 华南师范大学 | Saturable absorber test macro and saturable absorber test method |
| CN110104674A (en) * | 2019-05-13 | 2019-08-09 | 长春理工大学 | Copper doped gallium oxygen nonlinear material, saturable absorber and Q-switched pulse laser |
| CN110061408A (en) * | 2019-06-04 | 2019-07-26 | 四川大学 | It mixes the preparation of chromium selenizing zinc nanoparticles saturable absorber and its constitutes full optical fiber Q-switched laser |
| CN111463651A (en) * | 2020-03-25 | 2020-07-28 | 吉林大学 | Tuning method for working wavelength of ultrashort pulse fiber laser |
| CN113193470A (en) * | 2021-04-29 | 2021-07-30 | 吉林工程技术师范学院 | Preparation method of saturable absorber and fiber laser |
| CN114918425A (en) * | 2022-06-20 | 2022-08-19 | 杭州电子科技大学富阳电子信息研究院有限公司 | Gold nanorod with broadband adjustable absorption characteristic and preparation method thereof |
| CN115000794A (en) * | 2022-07-19 | 2022-09-02 | 中国科学院长春光学精密机械与物理研究所 | Light-operated modulation module and pulse laser system formed by same |
| CN115000794B (en) * | 2022-07-19 | 2022-11-04 | 中国科学院长春光学精密机械与物理研究所 | Light-operated modulation module and pulse laser system formed by same |
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