CN103259173B - Radio frequency modulation tunable all-fiber laser with stable power control - Google Patents
Radio frequency modulation tunable all-fiber laser with stable power control Download PDFInfo
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Abstract
The invention discloses a radio frequency modulation tunable all-fiber laser with stable power control. The radio frequency modulation tunable all-fiber laser is characterized in that a first fiber annular mirror, a double-clad non-doped fiber, a double-clad doped fiber, a signal light channel of a wavelength division multiplexer and a second fiber annular mirror are sequentially in butt fusion end to end, a second arm of the first fiber annular mirror is connected with a light power meter, the light power meter is connected with a controllable semiconductor laser power source, and the controllable semiconductor laser power source is connected with a pumping source; the pumping source is in butt fusion with a pumping light channel of the wavelength division multiplexer, and a second arm of the second fiber annular mirror is connected with an output tail fiber; the double-clad non-doped fiber is wound on a fiber fixing stretching support; a piezoelectric ceramic is connected with a radio-frequency power source. The radio frequency modulation tunable all-fiber laser with the stable power control has the advantages that an all-fiber structure without discrete components is adopted, insertion loss is avoided, beam quality is high, output power is high, structure is compact, performance is stable and reliable, and continuous tuning in a wide range can be achieved.
Description
Technical field
The invention belongs to laser technology field, be specifically related to a kind of fiber laser, particularly a kind of rf modulations tunable whole-optical fibre laser that there is power stability and control.
Background technology
The advantages such as fiber laser is little with its volume, efficiency is high, good stability, good beam quality, develop very rapid.At present in fiber laser, common adjustable laser technology mainly based on rotating grating, composite ring resonance, regulate the angle of intra cavity etalon, utilize acousto-optic filter, electricity adjusts the technology such as liquid crystal etalon, fiber grating tuning, fiber annular, sampled-grating and Polarization Control, adopt non-all optical fibre structure, the grating pair used is inconvenient to regulate efficiency low, or adjustable range is narrow, or power output is too small, and in tuning process, all there is the problem that laser output power changes with output wavelength.
Summary of the invention
For problem existing in current existing tunable fiber laser, the present invention discloses a kind of rf modulations tunable whole-optical fibre laser having power stability and control, this full-optical-fiber laser inserts very little, adopt fiber loop mirror as speculum, wherein one end adopts coupling ratio to be that 50:50 fiber loop mirror is as wide range completely reflecting mirror, the other end adopts coupling ratio away from 50:50 fiber loop mirror as outgoing mirror, the filter of the rf modulations of an all optical fibre structure is accessed in fiber laser, when the absorption spectra of filter and the gain spectral of Active Optical Fiber occur overlapping, the absorption spectra of filter just forms the gain spectral modulating action to Active Optical Fiber, gain spectral center gain wavelength after its result makes modulation is moved, under the effect of wide range speculum, the laser center wavelength excited will become with the centre wavelength of gain spectral, realize wavelength tuning, the 2nd port simultaneously utilizing coupling ratio to be 50:50 fiber loop mirror is monitored laser output power, utilize Monitoring Data by carrying out FEEDBACK CONTROL to the Injection Current of pumping source, realize laser output power stability contorting.
To achieve these goals, the present invention adopts following technical scheme to be solved:
A kind of rf modulations tunable whole-optical fibre laser that there is power stability and control, comprise the first fiber loop mirror, tractive support fixed by optical fiber, triangle vibration passing device, piezoelectric ceramic, cushion block, radio-frequency power supply, double clad undoped optical fiber, double-cladding doped fiber, wavelength division multiplexer WDM, pumping source, second fiber loop mirror, export tail optical fiber, light power meter and can power source of semiconductor laser be controlled, 1st arm of described fiber loop mirror, double clad undoped optical fiber, double-cladding doped fiber, the flashlight passage of wavelength division multiplexer WDM and the 1st arm of the second fiber loop mirror join end to end welding successively, 2nd arm of the first fiber loop mirror is connected with light power meter, light power meter connects can control power source of semiconductor laser, power source of semiconductor laser can be controlled and connect pumping source, the pump light passage welding of pumping source and wavelength division multiplexer, the 2nd arm of the second fiber loop mirror is connected with output tail optical fiber, described optical fiber is fixed tractive support and is comprised left lobe, right lobe, is connected between described left lobe, right lobe by rigid cage, left lobe, right lobe are cylinder flat in outer arc, and the column length of left lobe, right lobe, can meet fiber reel around for principle, left lobe, right lobe outer arc is all carved with multiple parallel groove, double clad undoped optical fiber is fixed around optical fiber in the groove of tractive support and also will be strained, and triangular prism props up and is placed on piezoelectric ceramic, establishes cushion block to make the rib contact double clad undoped optical fiber of triangular prism cradle top bottom piezoelectric ceramic, piezoelectric ceramic connects radio-frequency power supply, the physical dimension of described double clad undoped optical fiber is mated with described double-cladding doped fiber.
The present invention also comprises following other technologies feature:
Described piezoelectric ceramic passes into radio-frequency power supply and causes double clad undoped fiber-optic vibration, double clad undoped fiber core refractive index generating period is changed and forms long period fiber grating, produce the absorption spectra centered by a certain wavelength, when the gain spectral of this absorption spectra and double-cladding doped fiber is overlapping, the change of the output frequency of radio-frequency power supply makes long-period gratings absorption spectra move, thus gain spectral centre wavelength is moved; Output wavelength and the gain spectral centre wavelength of described laser match, thus by regulating the adjustment of radio-frequency power supply output frequency to realize the output wavelength needed.
Distance between described left lobe and right lobe is 8cm ~ 30cm.
Described left lobe and right lobe are semicolumn, semiellipse post or rectangular band semicolumn.
Separation adjacent on described left lobe, right lobe is 2mm ~ 5mm, and groove depth equals double clad undoped optical fiber jacket radius.
Described left lobe, right lobe top are equipped with press strip.
The drift angle of described triangular prism support is good with 30 ° ~ 60 °.
Described double clad undoped optical fiber is fixed tractive bracket outer at optical fiber and is wound around 4 circles, every turn separation 2mm.
Described first fiber loop mirror adopts coupling ratio to be 50:50, and the coupling ratio of the second fiber loop mirror is α: (1-α), wherein,
wherein, R is the reflectivity of the second fiber loop mirror.
Described double-cladding doped fiber choose 6/125 μm mix thulium doubly clad optical fiber, its covering absorptivity is 1.4dB/m@790nm, and fibre core numerical aperture is 0.23, and length gets 10m; The undoped doubly clad optical fiber of 6/125 μm chosen by described double clad undoped optical fiber.
The present invention adopts the mode of tuned radio-frequency to realize fiber laser wavelength tuning with the long period fiber grating that the ultrasonic vibration formation cycle is adjustable, ensure that laser keeps laser output power to stablize in tuning process in a feedback manner, fiber laser adopts all optical fibre structure without discrete component, without insertion loss, have that good beam quality, power output are high, compact conformation, advantage stable and reliable for performance, this laser can realize the continuous tuning of wide range simultaneously.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is absorption spectrum test structure schematic diagram.
Fig. 3 is the structural representation that tractive support fixed by optical fiber.
Fig. 4 is the vertical view of Fig. 3.
Fig. 5 is power stability feedback control structure schematic diagram.
Fig. 6 is the graph of a relation of the radio frequency output frequency of laser output wavelength and power output and radio-frequency power supply.
Below in conjunction with accompanying drawing and concrete embodiment, further explanation is explained to the present invention.
Embodiment
See Fig. 1, the rf modulations tunable whole-optical fibre laser that there is power stability and control of the present invention, comprise the first fiber loop mirror 1, tractive support 2 fixed by optical fiber, triangle vibration passing device 3, piezoelectric ceramic 4, cushion block 5, radio-frequency power supply 6, double clad undoped optical fiber 7, double-cladding doped fiber 8, wavelength division multiplexer 9(WDM), pumping source 10, second fiber loop mirror 11, export tail optical fiber 12, light power meter 13 and power source of semiconductor laser 14 can be controlled, 1st arm of described fiber loop mirror 1, double clad undoped optical fiber 7, double-cladding doped fiber 8, the flashlight passage of wavelength division multiplexer 9 and the 1st arm of the second fiber loop mirror 11 join end to end welding successively, 2nd arm of the first fiber loop mirror 1 is connected with light power meter 13, light power meter 13 connects can control power source of semiconductor laser 14, the pump light passage welding of pumping source 10 and wavelength division multiplexer 9, the 2nd arm of the second fiber loop mirror 11 is connected with output tail optical fiber 12.
The full-optical-fiber laser of the present invention of above-mentioned parts composition can be divided into five parts principle, is resonant cavity, gain fibre, tunable optic filter, unpumped section, power stability controller respectively.
Resonant cavity is made up of the first fiber loop mirror 1 and the second fiber loop mirror 11, first fiber loop mirror 1 is as the input of resonant cavity, it is the passive device that two output port fused fiber splices of 2 × 2 melting cone type broadband optical fiber couplers are formed together, coupling ratio is 50:50, its effect is equivalent to completely reflecting mirror, requires that reflectivity is more than or equal to 95%; Second fiber loop mirror 11, as the output of resonant cavity, adopts coupling ratio ratio to be α: the fiber loop mirror of (1-α), wherein α value is
r is the reflectivity of the second fiber loop mirror 11, and its effect is equivalent to outgoing mirror, and the size of reflectivity is adjusted by coupling ratio according to design requirement.During actual fabrication, also the signal end of wavelength division multiplexer 9 directly can be cut, reflect as the second fiber loop mirror 11 using the non-Neil of cut end face 4%.Incident light is by forming the two-beam transmitted with counter clockwise direction along clockwise direction after 2 × 2 melting cone type broadband optical fiber coupler beam splitting; the latter has the bit phase delay of 90 ° compared with the former, when after light beam goes in ring one week again through coupler beam splitting time output in be comparatively 180 ° of [Cao Xue from the total time delay of phase of light wave of clockwise direction contribution from the light wave of counterclockwise contribution; Li Xinying; Et al. (2009). " based on the optimal design of the fiber laser of fiber loop mirror. " optical communication technique 07:15-17.].Do not consider the supplementary load loss of coupler, if coupling ratio is α: (1-α), when α=0.5, in output will there is destructive interference in the light wave of two kinds of contributions, according to conservation of energy principle, whole input luminous energy will be exported by incidence end, medium its reflection characteristic identical of advancing due to the light of both direction shows as wavelength and has nothing to do, so it can as a wide range completely reflecting mirror, serve as the end mirror of fiber laser, when α ≠ 0.5, be equivalent to the wide range speculum that a reflectivity is R=4 α (1-α), its effect can be equivalent to the outgoing mirror of laser.What all adopt due to end mirror and outgoing mirror is wide range speculum, and such laser output wavelength is by consistent with the gain spectral centre wavelength of Active Optical Fiber and double clad undoped optical fiber 8.
Gain fibre and double-cladding doped fiber 8, it can adopt any one the double clad single-mode fiber had compared with wide gain spectrum existing, as long as the absorption spectra of tunable optic filter and the gain spectral of gain fibre that meet employing have overlapping, just tunable output can be realized.The present invention is adapted to the fiber laser of all doping, its essential difference of fiber laser for the doubly clad optical fiber medium of difference doping is: the double-cladding doped fiber 8 selected by fiber laser is different, corresponding pumping source 10 will match, and the output frequency range of corresponding radio-frequency power supply 6 also needs to match.Consider the output mode of laser of the present invention, select corresponding core size and fibre core numerical aperture; According to the absorbing state of doped fiber to pumping, determine the size of the inner cladding needing to select optical fiber, covering absorptivity and fiber lengths.
Tunable optic filter is core component of the present invention, refers to Fig. 1-Fig. 4, comprises optical fiber and fixes tractive support 2, triangular prism support 3, piezoelectric ceramic 4, cushion block 5, radio-frequency power supply 6 and double clad undoped optical fiber 7; Wherein, described optical fiber is fixed tractive support 2 and is comprised left lobe 21, right lobe 22, is connected and both distances (i.e. the length of rigid cage 23) are 8cm ~ 30cm between left lobe 21, right lobe 22 by rigid cage 23; Left lobe 21, right lobe 22 are cylinder flat in outer arc, can be specifically semicolumn, semiellipse post or rectangular band semicolumn, the column length of left lobe 21, right lobe 22 is can meet fiber reel around for principle, left lobe 21, right lobe 22 outer arc are all carved with multiple parallel groove 25, adjacent groove 25 spacing is 2mm ~ 5mm, groove depth is double clad undoped optical fiber 7 surrounding layer radius, namely ensureing that double clad undoped optical fiber 7 is put in and wherein can expose half, being provided with the press strip 24 for being fixed double clad undoped optical fiber 7 at left lobe 21, right lobe 22 top.
The filter, dielectric of tunable optic filter and the physical dimension of double clad undoped optical fiber 7 need to mate completely with gain fibre, be convenient to welding like this and loss is less, double clad undoped optical fiber 7 is fixed around optical fiber in the groove 25 of tractive support 2 and also will strain, then triangular prism support 3 is placed on piezoelectric ceramic 4, bottom piezoelectric ceramic 4, cushioning cushion block 5 makes the rib at the top of triangular prism support 3 fix the top edge of tractive support 2 higher than optical fiber, thus make the rib contact double clad undoped optical fiber 7 at triangular prism support 3 top, form string and supporting structure that one is similar to seven-stringed plucked instrument in some ways similar to the zither.The drift angle of triangular prism support 3 is good with 30 ° ~ 60 °.Triangular prism support 3, piezoelectric ceramic 4, cushion block 5 form vibration and produce and vibrational energy transmitting portions.Piezoelectric ceramic 4 connects radio-frequency power supply 6.When radio frequency output causes piezoelectric ceramic 4 to vibrate, vibrational energy passes to double clad undoped optical fiber 7 by triangular prism support 3, periodic swinging is formed in this optical fiber, double clad undoped optical fiber 7 fiber core refractive index generating period is caused to change, when the pattern in fibre core pattern and inner cladding meets phase-matching condition, fibre core pattern and inner cladding pattern effects of coupling between will be there is, its effect is equivalent to a long period fiber grating, produce the absorption spectra centered by a certain wavelength, central absorbent spectrum is relevant to screen periods, and the frequency that screen periods vibrates with radio frequency, Oscillation Amplitude is relevant, when Oscillation Amplitude one timing, by the absorption spectra regulating the output frequency of radio-frequency power supply 6 to change long period fiber grating, when the absorption spectra of long period fiber grating and the gain spectral of gain fibre occur overlapping, cause the change of gain spectral centre wavelength, by the movement regulating the output frequency of radio-frequency power supply 6 can produce long-period gratings absorption spectra, thus cause the movement of gain spectral centre wavelength.First fiber loop mirror and the second fiber loop mirror are wide range speculum, and output wavelength and the gain spectral centre wavelength of laser match, and when regulating the output frequency of radio-frequency power supply 6, change gain spectral centre wavelength, realize tuned radio-frequency and export.
The effect of power stability controller is its stable output power when ensureing that laser of the present invention carries out wavelength tuning, and it comprises the light power meter 13 that is connected and can control power source of semiconductor laser 14, as shown in Figure 5.Generally, the 2nd arm sling sky as the first fiber loop mirror 1 of completely reflecting mirror need not, although the first fiber loop mirror coupling ratio is 50:50 theoretically, in fact the 2nd arm still has a small amount of Laser output, can be used for connecting the power output that laser monitored by light power meter 13, light power meter 13 connects the first fiber loop mirror the 2nd arm, and the power output of laser, also namely the output power output of tail optical fiber 11 and the power output of the first fiber loop mirror the 2nd arm have fixing proportionate relationship, thus the object of the power output of monitoring laser can be reached by the power output of monitoring first fiber loop mirror the 2nd arm, this power and laser output power are directly proportional, illustrate that laser itself exports change greatly when the power monitoring the first fiber loop mirror the 2nd arm increases, otherwise still.Therefore, be connected with the 2nd arm of the first fiber loop mirror 1 by light power meter 13, the monitoring result of light power meter 13 is delivered to and can be controlled in power source of semiconductor laser 14, can control power source of semiconductor laser 14 and connect pumping source 10; When carrying out wavelength tuning or normally working, just can carry out stability contorting according to monitoring result to laser output power, concrete employing FEEDBACK CONTROL, if also namely laser output power increases, then reduce the output current that can control power source of semiconductor laser 14, thus reduce the power output of pumping source 10, on the contrary then increase the output current of power supply 14, reach the effect of stable laser power output.
As shown in Figure 5, the structure that can control power source of semiconductor laser 14 is reverse input ends of the output termination operational amplifier A 2 at relatively power meter (or photoelectric detector, the devices such as such as PINPD, APDPD).When power output increases, output level raises, and A2 exports reduction, realizes FEEDBACK CONTROL, the object that laser stabilization exports.
In the structure of tunable optic filter, being wrapped in the number of turns that optical fiber fixes the undoped doubly clad optical fiber of tractive support 2 outside is 1-8 circle, the number of turns is more, the degree of depth of absorption spectra is darker, generally can select the suitable number of turns according to the width of the gain spectral of gain media and intensity, effectively be modulated to principle reaching.
In the structure shown here, mode coupling effect is relevant with fibre diameter with the intensity that radio frequency vibrates, and vibrational energy is more, and coupling efficiency is higher, the thinner coupling effect of optical fiber is more obvious, particularly when after the surrounding layer taking down undoped doubly clad optical fiber, coupling effect is obviously strengthened, and traces it to its cause and is that surrounding layer is resin material, the fibre core stayed after being removed and inner wrap material are quartz glass, vibrating effect is strengthened, and absorbs the degree of depth and also strengthens a lot, can reduce the requirement of radio frequency output power of power supply like this.Hot soarfing can be adopted to remove or the surrounding layer of optical fiber that optical fiber is fixed between the left lobe of tractive support 2, right lobe by the method for chemical corrosion divests, obtain the coupling effect of stronger pattern and the larger absorption degree of depth with it.
In the structure shown here, absorbent core wavelength and rf frequency variable quantity linear, its meet
λ＝λ
0+kΔf
In formula, λ is absorbent core wavelength, and Δ f is rf frequency variable quantity, λ
0for measuring basis wavelength, absorbent core wavelength namely corresponding to Δ f=0, k is the slope that absorbent core wavelength changes with rf frequency, it is except outside the Pass having with fiber core and inner cladding structural parameters, also relevant with the mechanical characteristic of optical fiber, k span is greatly about-0.1 ~-1nm/KHz, and along with the increase of rf frequency, absorbent core wavelength blue shift can occur.
Unpumped section comprises pumping source 10 and wavelength division multiplexer WDM9 is formed, and provides laser works institute energy requirement; The semiconductor laser that pumping source 10 adopts band tail optical fiber to export, its pumping wavelength required by output wavelength demand fulfillment gain fibre, corresponding pump power is selected in the power output size choosing that then laser according to the present invention requires.Pumping source 10 exports pump light, the inner cladding of double-cladding doped fiber 8 is coupled into through wavelength division multiplexer WDM9, and then be transported to the fibre core of double-cladding doped fiber 8 continually from this inner cladding, for the working-laser material in fibre core provides pump energy, working-laser material is fluorescence excitation under the effect of pump light, if now increase speculum at working-laser material two ends, gratings etc. provide certain light feedback just can form Laser output, the output wavelength of Laser output determined by reflectance spectrum and the coefficient result of gain spectral, during for fiber grating as speculum, owing to being the reflection of narrow spectrum, output wavelength is exactly that (this wavelength must drop in gain spectral certainly for the reflection wavelength of fiber grating, preferably in high gain region), for wide range speculum, in high reflectance range of wavelengths, highest-gain wavelength is exactly the final laser output wavelength obtained.
In the present invention, tractive support 2, triangular prism support 3, piezoelectric ceramic 4, cushion block 5, radio-frequency power supply 6 and double clad undoped optical fiber 7 is fixed owing to adding optical fiber in the fiber laser main body of all optical fibre structure, its effect forms the absorption spectra with certain depth at double clad undoped optical fiber 7, form the modulation to original excitation spectrum, when changing the output frequency of radio-frequency power supply 6, just can change the centre wavelength of absorption spectra, thus change the centre wavelength of the excitation spectrum after modulation.In the present invention, laserresonator provided by the first fiber loop mirror 1 and the second fiber loop mirror 11, the two is all wide range speculum, it does not have frequency-selecting effect to laser output wavelength, laser output wavelength only by net gain spectrum (namely gain spectral superpose with absorption spectra after gain spectral, namely also gain spectral deducts absorption spectra) impact, also namely equal the highest-gain wavelength of net gain spectrum.
Embodiment:
As shown in Figure 1, follow technique scheme of the present invention, the rf modulations tunable whole-optical fibre laser with power stability control of the present embodiment, comprises resonant cavity, gain fibre, pumping source, tunable optic filter, power stability controller five part.
Resonant cavity: the first fiber loop mirror 1 is coupling ratio is 50:50 fiber loop mirror, the second fiber loop mirror 11 coupling ratio is α: (1-α), wherein α value is
(R is the reflectivity of the second fiber loop mirror 11), the two is all wide range speculum, can be adapted to any doped fiber and any wavelength.
Gain fibre: double-cladding doped fiber 8 choose 6/125 μm mix thulium doubly clad optical fiber, covering absorptivity is 1.4dB/m@790nm, and be namely also 1.4dB/m in 790nm place covering absorptivity, fibre core numerical aperture is 0.23, and fiber lengths gets 10m.Because thulium doped fiber has wider gain spectral, therefore larger tuning range can be realized, the size of its tuning range of fiber laser for other doping depends primarily on the gain spectral of working-laser material in institute's doped fiber, and gain spectral is wider, and to realize tuning scope also larger.
Pumping source 10: the output tail optical fiber selecting 790nm is 100 μm, and peak power output is the semiconductor laser of 35W.Wavelength division multiplexer 9 adopts output and signal end to be 6/125 μm, and pumping end is the wavelength division multiplexer of (1+1*1) of 100 μm.
Tunable optic filter: double clad undoped optical fiber 7 physical dimension is mated with double-cladding doped fiber 8, namely the undoped doubly clad optical fiber of 6/125 μm is selected, fibre core numerical aperture is 0.23, double clad undoped optical fiber 7 is fixed on tractive support at optical fiber and pushes down with press strip 24 after 4 circles, every ring gap 2mm, the surrounding layer of oscillating component optical fiber removes; In this embodiment optical fiber fix the unsettled distance of optical fiber between tractive support get 10cm(also namely the length of rigid cage 23 get 10cm); Piezoelectric ceramic 4 adopts and is of a size of the rectangular sheet of 45*8*5mm; Radio frequency Drazin inverse scope is at 1MHz ~ 1.5MHz.Double clad undoped optical fiber 7 physical dimension is mated with double-cladding doped fiber 8, and the reflectivity of the second fiber loop mirror 11 gets R=20%, and being equivalent to coupling ratio is 94.7:5.3.
The tuning range of the vibration frequency of radio-frequency power supply 6 needs to measure in advance, refer to Fig. 2, inject by the wide spectrum optical signal of wide spectrum light source 15 from double clad undoped optical fiber 7 one end via lens 16, this light source light spectrum scope should comprise the fluorescence Spectra of doped chemical in double-cladding doped fiber 8, spectrometer 17 is placed at the other end of double clad undoped optical fiber 7, after piezoelectric ceramic 4 is connected radio-frequency power supply 6, measure and record radio frequency and export the absorption spectra that the vibration that causes produces.The gain spectral of absorption spectra with double-cladding doped fiber 8 compared, the frequency corresponding to intersection is exactly the tuning range corresponding to radio-frequency power supply, and radio frequency power output being intended to be good by absorption spectra compared with excitation spectrum.
Power stability controller: comprise light power meter 13 and power source of semiconductor laser 14 can be controlled, device through just completing tunable optical fiber laser of the present invention is above selected and test, each parts are only needed to assemble according to structure shown in Fig. 1 afterwards, by the 1st arm of the first fiber loop mirror 1, double clad undoped optical fiber 7, double-cladding doped fiber 8, the multiplexing end head and the tail phase welding successively of wavelength division multiplexer 9, by the pumping input welding of pumping source 10 with wavelength division multiplexer 9, the signal end of wavelength division multiplexer 9 and the second fiber loop mirror 11 the 1st arm welding, second fiber loop mirror the 2nd arm and the welding of output tail optical fiber, require during welding that fibre core is aimed at, light light power meter is sent in the output of the first fiber loop mirror the 2nd arm, and the result that light power meter 13 is monitored is delivered to and can be controlled the stability contorting of power source of semiconductor laser 14 by realizing exporting laser to the FEEDBACK CONTROL of pump power.
Be illustrated in figure 6 the experimental relationship figure of the tuned frequency of laser output wavelength in this example, power output and rf modulations.
Claims (10)
1. there is the rf modulations tunable whole-optical fibre laser that power stability controls, it is characterized in that, comprise the first fiber loop mirror (1), tractive support (2) fixed by optical fiber, triangular prism support (3), piezoelectric ceramic (4), cushion block (5), radio-frequency power supply (6), double clad undoped optical fiber (7), double-cladding doped fiber (8), wavelength division multiplexer (9), pumping source (10), second fiber loop mirror (11), export tail optical fiber (12), light power meter (13) and power source of semiconductor laser (14) can be controlled, the 1st arm of described fiber loop mirror (1), double clad undoped optical fiber (7), double-cladding doped fiber (8), the flashlight passage of wavelength division multiplexer (9) and the 1st arm of the second fiber loop mirror (11) join end to end welding successively, 2nd arm of the first fiber loop mirror (1) is connected with light power meter (13), light power meter (13) connects can control power source of semiconductor laser (14), can control power source of semiconductor laser (14) and connect pumping source (10), the pump light passage welding of pumping source (10) and wavelength division multiplexer (9), the 2nd arm of the second fiber loop mirror (11) is connected with output tail optical fiber (12), described optical fiber is fixed tractive support (2) and is comprised left lobe (21), right lobe (22), is connected between described left lobe (21), right lobe (22) by rigid cage (23), left lobe (21), right lobe (22) are cylinder flat in outer arc, the column length of left lobe (21), right lobe (22), can meet fiber reel around for principle, left lobe (21), right lobe (22) outer arc is all carved with multiple parallel groove (25), double clad undoped optical fiber (7) is fixed in the groove (25) of tractive support (2) around optical fiber and also will be strained, triangular prism support (3) is placed on piezoelectric ceramic (4), and piezoelectric ceramic (4) bottom establishes cushion block (5) to make rib contact double clad undoped optical fiber (7) at triangular prism support (3) top, piezoelectric ceramic (4) connects radio-frequency power supply (6), the physical dimension of described double clad undoped optical fiber (7) is mated with described double-cladding doped fiber (8).
2. there is rf modulations tunable whole-optical fibre laser that power stability controls as claimed in claim 1, it is characterized in that, described piezoelectric ceramic (4) passes into radio-frequency power supply (6) and causes double clad undoped optical fiber (7) to vibrate, double clad undoped optical fiber (7) fiber core refractive index generating period is changed and forms long period fiber grating, produce the absorption spectra centered by a certain wavelength, when the gain spectral of this absorption spectra and double-cladding doped fiber (8) is overlapping, the change of the output frequency of radio-frequency power supply (6) makes long-period gratings absorption spectra move, thus gain spectral centre wavelength is moved, output wavelength and the gain spectral centre wavelength of described laser match, thus by regulating the adjustment of radio-frequency power supply (6) output frequency to realize the output wavelength needed.
3. have the rf modulations tunable whole-optical fibre laser that power stability controls as claimed in claim 1, it is characterized in that, the distance between described left lobe (21) and right lobe (22) is 8cm ~ 30cm.
4. have the rf modulations tunable whole-optical fibre laser that power stability controls as claimed in claim 1, it is characterized in that, described left lobe (21) and right lobe (22) are semicolumn, semiellipse post or rectangular band semicolumn.
5. there is rf modulations tunable whole-optical fibre laser that power stability controls as claimed in claim 1, it is characterized in that, described left lobe (21), upper adjacent groove (25) spacing of right lobe (22) are 2mm ~ 5mm, and groove depth equals double clad undoped optical fiber (7) surrounding layer radius.
6. have the rf modulations tunable whole-optical fibre laser that power stability controls as claimed in claim 1, it is characterized in that, described left lobe (21), right lobe (22) top are equipped with press strip (24).
7. have the rf modulations tunable whole-optical fibre laser that power stability controls as claimed in claim 1, it is characterized in that, the drift angle of described triangular prism support (3) is good with 30 ° ~ 60 °.
8. there is rf modulations tunable whole-optical fibre laser that power stability controls as claimed in claim 1, it is characterized in that, described double clad undoped optical fiber (7) is fixed tractive support (2) outside at optical fiber and is wound around 4 circles, every turn separation 2mm.
9. there is rf modulations tunable whole-optical fibre laser that power stability controls as claimed in claim 1, it is characterized in that, described first fiber loop mirror (1) adopts coupling ratio to be 50:50, the coupling ratio of the second fiber loop mirror (11) is α: (1-α), wherein
wherein, R is the reflectivity of the second fiber loop mirror.
10. there is rf modulations tunable whole-optical fibre laser that power stability controls as claimed in claim 1, it is characterized in that, described double-cladding doped fiber (8) choose 6/125 μm mix thulium doubly clad optical fiber, its covering absorptivity is 1.4dB/m@790nm, fibre core numerical aperture is 0.23, and length gets 10m; Described double clad undoped optical fiber (7) chooses the undoped doubly clad optical fiber of 6/125 μm.
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| US4915468A (en) * | 1987-02-20 | 1990-04-10 | The Board Of Trustees Of The Leland Stanford Junior University | Apparatus using two-mode optical waveguide with non-circular core |
| CN1346990A (en) * | 2001-10-26 | 2002-05-01 | 清华大学 | Process for preparing optical fibre based on single-mode optical fibre to implement different performance of acousto-optic filter |
| CN1617037A (en) * | 2004-12-03 | 2005-05-18 | 清华大学 | Broadband envelope flat full optical fiber multiple wavelength Raman laser |
| CN101083382A (en) * | 2007-06-28 | 2007-12-05 | 吉林大学 | Low noise tunable single frequency fiber laser for full-optical communication and its test system |
| CN102157889A (en) * | 2011-03-21 | 2011-08-17 | 山东大学 | Fiber optical laser of L waveband with wavelength tunable |
| CN102738690A (en) * | 2012-06-29 | 2012-10-17 | 西北大学 | 540nm all-fiber high-power green fiber laser |
-
2013
- 2013-04-22 CN CN201310141663.0A patent/CN103259173B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4915468A (en) * | 1987-02-20 | 1990-04-10 | The Board Of Trustees Of The Leland Stanford Junior University | Apparatus using two-mode optical waveguide with non-circular core |
| CN1346990A (en) * | 2001-10-26 | 2002-05-01 | 清华大学 | Process for preparing optical fibre based on single-mode optical fibre to implement different performance of acousto-optic filter |
| CN1617037A (en) * | 2004-12-03 | 2005-05-18 | 清华大学 | Broadband envelope flat full optical fiber multiple wavelength Raman laser |
| CN101083382A (en) * | 2007-06-28 | 2007-12-05 | 吉林大学 | Low noise tunable single frequency fiber laser for full-optical communication and its test system |
| CN102157889A (en) * | 2011-03-21 | 2011-08-17 | 山东大学 | Fiber optical laser of L waveband with wavelength tunable |
| CN102738690A (en) * | 2012-06-29 | 2012-10-17 | 西北大学 | 540nm all-fiber high-power green fiber laser |
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| CN103259173A (en) | 2013-08-21 |
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