CN204290019U - A kind of tunable narrow-linewidth single-frequency linearly polarized laser device - Google Patents
A kind of tunable narrow-linewidth single-frequency linearly polarized laser device Download PDFInfo
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- CN204290019U CN204290019U CN201420032269.3U CN201420032269U CN204290019U CN 204290019 U CN204290019 U CN 204290019U CN 201420032269 U CN201420032269 U CN 201420032269U CN 204290019 U CN204290019 U CN 204290019U
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Abstract
The utility model provides a kind of tunable narrow-linewidth single-frequency linearly polarized laser device, this laser comprise heat sink and be encapsulated in heat sink on pumping source, the first collimating lens, laser Effect of Back-Cavity Mirror, thermo-optic tunable filter, the second collimating lens, the highly doped multicomponent glass optical fiber of rare earth ion, superstructure polarization-maintaining fiber grating, protect polarisation isolator, polarization maintaining optical fibre and thermoelectric refrigerating unit.The utility model adopts short straight Simple Harmonics cavity configuration, utilize the highly doped of multicomponent glass optical fiber and high-gain feature, the frequency-selecting effect of recycling thermo-optic tunable filter and superstructure polarization-maintaining fiber grating and wavelength tuning function, in conjunction with precision temperature regulation technology, by regulating the distribution of its reflection wavelength and transmission peak wavelength in real time, cause and change its peak overlap position, thus realize that wide tunable range, live width are extremely narrow, the stable output of the continuously adjustable formula single-frequency linearly polarized laser of High Extinction Ratio, high-output power.
Description
Technical field
The utility model relates to optical fiber remote sensing, coherent swpectrum closes the laser light sources used by field such as bundle, gravitational wave detection, laser radar and nonlinear frequency conversion, the single frequency laser of especially a kind of tunable, narrow linewidth, linear polarization running.
Background technology
Narrow-line width single frequency optical fiber laser is an important branch of laser developments, and it has pole narrow linewidth, low noise, excellent coherence.Especially its spectral line width is extremely narrow (can reach 10
-8nm), 2 orders of magnitude narrower than the live width of existing best narrow linewidth Distributed Feedback Laser, than live width also narrow 5 ~ 6 orders of magnitude of DWDM signal optical source in current optical communication network.Close the applications such as bundle, laser radar, nonlinear frequency conversion at coherent swpectrum and have huge potential value, seem very important.And the spectral line width of these field General Requirements lasers is extremely narrow, linear polarization operates and tunable (multichannel or multi-wavelength work), these parameters determine and have impact on all multi objective such as resolution, conversion efficiency, cost of application scenario.Therefore, in the urgent need to developing a kind of simple and reliable tunable narrow-linewidth single-frequency linearly polarized laser device.
The tunable single frequency laser of current research report, generally use rare earth ion doped silica fiber or rare earth ion doped solid crystals as the working media of single-frequency laser, insert the low bulk-optic modulation crystal (electrooptic crystal of reliability in the optical path, thermo-optical crystal or F-P etalon etc.) for maintaining single-frequency operation or regulating laser frequency, but the concentration that all there is doping with rare-earth ions cannot improve further, resonator is longer, easy mode hopping, reliability is poor waits series of problems, the generally maximum adjustable single-frequency laser that directly can only export tens mW magnitudes, and maximum difficult point to be that live width is more difficult accomplish below 10kHz, noise is larger.
Use the highly doped multicomponent glass optical fiber of rare earth ion as the gain media of laser, in conjunction with short straight single-frequency laser resonant cavity, effectively can realize the single-frequency laser that power output is greater than 100mW, live width is less than 2kHz and export.Research work related to this has: the Yb codoped phosphate glass optical fiber that the people such as C. Spiegelberg adopt 2cm long, achieve single frequency fiber Laser output report [the J. Lightwave Technol. that power output is greater than 200mW, live width is less than 2kHz, wavelength is 1.5 μm, 2004,22:57].Z. the people such as the Feng ytterbium doped phosphate glasses optical fiber that adopts 0.8cm long, achieve linear polarization single frequency fiber Laser output report [the Appl. Phys. Express that power output is greater than 200mW, live width is less than 2kHz, extinction ratio is greater than 30dB, wavelength is 1.06 μm, 2013,6:052701].In addition, 2004, Alexandria university of the U.S. and NP Photonics have applied for high power narrow linewidth single-frequency laser system patent [publication number: US 2004/0240508 A1], adopt microchip laser resonator structure, but the single frequency laser required by it does not have, and linear polarization exports, the feature of tunable wave length.2011, American I PG company has applied for high power narrow linewidth fiber laser patent [publication number: US 7903696 B2], 2 ultrashort Simple Harmonics chambeies are adopted to export low-power narrow-linewidth single frequency laser signal, carry out laser power amplification respectively through common erbium-doped fiber amplifier and High Power Double-Clad Fiber Amplifiers, but the fiber laser required by it does not have yet, and linear polarization exports, the feature of tunable wave length.
Utility model content
The utility model object is to overcome prior art above shortcomings, provides a kind of narrow-linewidth single frequency linearly polarized laser device of tunable, can continuously with the output wavelength of optionally tuning laser, wider tunable wave length scope can be covered.The utility model adopts short straight Simple Harmonics cavity configuration, utilize the highly doped of multicomponent glass optical fiber and high-gain feature, the frequency-selecting effect of recycling thermo-optic tunable filter and superstructure polarization-maintaining fiber grating and wavelength tuning function, in conjunction with precision temperature regulation technology (thermoelectric refrigerating unit TEC), final under pumping source provides the prerequisite of pumping (pumping) energy, can effectively realize can the stable output of single-frequency linearly polarized laser of wide region tuning, kHz magnitude live width, High Extinction Ratio.
The purpose of this utility model is achieved through the following technical solutions.
A kind of tunable narrow-linewidth single-frequency linearly polarized laser device, it comprise heat sink and be encapsulated in heat sink on pumping source, the first collimating lens, laser Effect of Back-Cavity Mirror, thermo-optic tunable filter, the second collimating lens, the highly doped multicomponent glass optical fiber of rare earth ion, superstructure polarization-maintaining fiber grating, protect polarisation isolator, polarization maintaining optical fibre and thermoelectric refrigerating unit TEC; Described pumping source, the first collimating lens, laser Effect of Back-Cavity Mirror, thermo-optic tunable filter, the second collimating lens, the highly doped multicomponent glass optical fiber of rare earth ion, superstructure polarization-maintaining fiber grating, guarantor's polarisation isolator, polarization maintaining optical fibre are arranged in turn, and pumping source, thermo-optic tunable filter, superstructure polarization-maintaining fiber grating are arranged on a thermoelectric refrigerating unit TEC all separately.
Further, the output of described pumping source is of coupled connections through the first collimating lens and laser Effect of Back-Cavity Mirror, laser Effect of Back-Cavity Mirror is connected with thermo-optic tunable is filter coupled, thermo-optic tunable filter and the second collimating lens are of coupled connections, the input of the second collimating lens and the highly doped multicomponent glass optical fiber of rare earth ion is of coupled connections, the output of the highly doped multicomponent glass optical fiber of rare earth ion and the input of superstructure polarization-maintaining fiber grating are of coupled connections, the output of superstructure polarization-maintaining fiber grating is of coupled connections with the input protecting polarisation isolator, the output protecting polarisation isolator is connected with the pigtail coupling of polarization maintaining optical fibre.
Further, the eyeglass end face of described laser Effect of Back-Cavity Mirror is coated with thin layer, and pellicle film is high anti-to laser signal wavelength, and reflectivity requirements is greater than 80%; Thoroughly high to pump wavelength, transmission requirement is greater than 80%.
Further, described thermo-optic tunable filter is F-P type film tunable filter, utilize thermo-optical properties and the high index of refraction characteristic of this filter medium thin-film material, thermoelectric refrigerating unit TEC is adopted to carry out precision temperature control, the refractive index of dielectric multi-layer optical thin film material in this filter is changed, and what realize transmission peak wavelength is tunable.
Further, the fibre core composition of the highly doped multicomponent glass optical fiber of described rare earth ion is phosphate glass component, and it consists of: 65P
2o
5-10Al
2o
3-20BaO-3La
2o
3-2Nd
2o
3; Its host material includes but not limited to the multicomponent glasses such as phosphate glass, silicate glass, germanate glass.
Further, the fibre core Uniform Doped high concentration rare earth light emitting ionic of the highly doped multicomponent glass optical fiber of described rare earth ion, the doping content of rare earth luminous ion requires to be greater than 1 × 10
20ions/cm
3; Described rare earth luminous ion comprises the combination of one or more in lanthanide ion, alkaline-earth metal ions, transition metal ions.
Further, the core shape of the highly doped multicomponent glass optical fiber of described rare earth ion is circular, core diameter is 3 ~ 50 μm, and cladding shape is circle, D shape, hexagon or octagon, and wherein the diameter of circular covering or the limit of non-circular covering are 80 ~ 900 μm to back gauge.
Further, one end of the highly doped multicomponent glass optical fiber of described rare earth ion is coated with multi-layered antireflection coating, and anti-reflection film is thoroughly high to laser signal wavelength, and transmissivity is greater than 90%, reflects for suppressing fiber end face.
Further, described superstructure polarization-maintaining fiber grating is to the selective pectination reflection of laser signal wavelength and fractional transmission, and centre wavelength reflectivity is 20% ~ 80%, has that reflection peak uniformity is good, the feature of narrow bandwidth, as the coupling components and parts of Laser output.
Further, described pumping source is the semiconductor laser of edge emitting structure or other packing forms; Described pumping source (1) output mode is single mode or multimode, and output parameter is pumping wavelength 800 ~ 1200nm, exports pump power and is greater than 50mW; The pump mode of described pumping source is forward pumping, and the pump light that namely pumping source sends directly is coupled into light path from collimating lens.
Further, described thermo-optic tunable filter and superstructure polarization-maintaining fiber grating carry out precision temperature control by independently thermoelectric refrigerating unit TEC, form laser wavelength/frequency tuning funtion part; Regulated by precision temperature and cause the corresponding change of the refractive index of fiber grating, filter, and then the grid region reflectance spectrum of the superstructure polarization-maintaining fiber grating lap position that is coupled with the transmitted spectrum of thermo-optic tunable filter is changed continuously, carry out laser frequency-selecting with the maximum feedback gain obtaining different wave length place, namely realizing can the output wavelength of wide region, continuously tuning single-frequency linearly polarized laser device.
Above-mentioned superstructure polarization-maintaining fiber grating utilizes the light sensitivity of fiber optic materials to inscribe grid region on polarization maintaining optical fibre, that the polarization-maintaining fiber grating having an identical parameters by multistage forms with identical spacing cascade, to selective pectination reflection (i.e. fractional transmission) of laser signal wavelength, centre wavelength reflectivity requirements 20 ~ 80%.Superstructure polarization-maintaining fiber grating carries out precision temperature control by independently TEC chip, its refractive index is changed, be coupled overlapping by the spectrum of tuned reflective grating region with the transmitted spectrum of thermo-optic tunable filter, realize the frequency-selecting of single-frequency laser single wavelength, feedback and swash penetrating output.
Between above-mentioned optical device and optical fiber, connected mode directly collimates coupling by space, or its corresponding fiber end face of grinding and polishing carries out mechanical splice coupling, or adopt heat sealing machine melting butt coupling.
After above-mentioned single-frequency linearly polarized laser exports, export respectively through guarantor's polarisation isolator, polarization maintaining optical fibre, wherein protect polarisation isolator for ensureing the Normal Feedback of light path and suppressing the bad light reflection of end face, improve the stability of laser output power.
Above-mentioned light path and components and parts are fixedly encapsulated on a metal heat sink, effectively carry out heat dissipation, avoid accumulation of heat problem during laser works, ensure the Stability and dependability of its power output, laser work wavelength.
Compared with prior art, technique effect of the present utility model and advantage comprise: the utility model structure is simple, are easy to realize.It is using the gain media of highly doped for rare earth ion multicomponent glass optical fiber (centimetres) as laser, adopts short lines shape cavity resonator structure.The resonant cavity of single-frequency linearly polarized laser is wherein formed together primarily of thermo-optic tunable filter, multicomponent glass optical fiber, superstructure polarization-maintaining fiber grating.First, pumping source carries out pumping to laserresonator, the rare earth luminous ion generation population inversion in multicomponent glass optical fiber fibre core, produces stimulated radiation flashlight; Secondly, by precision temperature control module---thermoelectric refrigerating unit (TEC chip) carries out temperature adjustment to thermo-optic tunable filter, can control pectination transmission peaks distribution (change transmission peak wavelength) with the filtering generation of tuning institute; Equally temperature adjustment is carried out to superstructure polarization-maintaining fiber grating, change the pectination reflection peak Wavelength distribution in reverberation grid region, can optionally make its maximum reflection peak overlapping in a certain wavelength location with the max transmissive peak of thermo-optic tunable filter, form maximum laser feedback oscillator, like this under the effective Feedback effect of front Effect of Back-Cavity Mirror, flashlight repeatedly oscillate feeds back and is repeatedly amplified.Chamber due to laserresonator is long only has centimetres, adjacent longitudinal mode spacing in chamber can reach GHz, when the spectrum of thermo-optic tunable filter and the overlapping wavelength of superstructure polarization-maintaining fiber grating is narrow extremely to a certain degree, make the frequency that only there is a longitudinal mode within the scope of the gain curve of working media, stable single-frequency linearly polarized laser can be realized and export.Continue to increase pumping light power, laser linewidth, by further constriction, finally can realize the stable output of the narrow-linewidth single frequency linearly polarized laser of kHz magnitude.In above-mentioned tuning process, regulated by the accurate temperature control of thermoelectric refrigerating unit and change Temperature Distribution, the pectination maximum reflection spectrum peak distribution of superstructure polarization-maintaining fiber grating can be continuously changed and change the pectination max transmissive spectrum peak distribution of thermo-optic tunable filter, both Wavelength distribution are made to carry out overlap again in other a certain wavelength location, obtain the maximum feedback effect at different wave length place, namely can be real-time, continue and the output wavelength optionally changing single-frequency linearly polarized laser, final realization can wide region tuning, kHz magnitude live width, the stable output of the tuner-type single-frequency linearly polarized laser of High Extinction Ratio.
Accompanying drawing explanation
Fig. 1 is the typical pectination reflectance spectrum schematic diagram of superstructure polarization-maintaining fiber grating in the utility model.
Fig. 2 is the principle schematic of tunable narrow-linewidth single-frequency linearly polarized laser device in the utility model embodiment, and wherein laser Effect of Back-Cavity Mirror uses glasses lens plated mode, and laser front cavity mirror uses superstructure polarization-maintaining fiber grating, and pump mode is forward pumping.
Fig. 3 is TEC temperature control mode and encapsulation schematic diagram in the utility model embodiment.
In figure: 1-pumping source, the 2-the first thermoelectric refrigerating unit TEC, the 3-the first collimating lens, 4-laser Effect of Back-Cavity Mirror, 5-thermo-optic tunable filter, the 6-the second thermoelectric refrigerating unit TEC, the 7-the second collimating lens, 8-Yb codoped phosphate glass optical fiber, 9-superstructure polarization-maintaining fiber grating, the 10-the three thermoelectric refrigerating unit TEC, 11-protect polarisation isolator, 12-polarization maintaining optical fibre, 13-heat sink.
Embodiment
Below in conjunction with specific embodiment and accompanying drawing, explaination is further described to the utility model, but is not limited to this execution mode.
As shown in Figure 1, be the typical pectination reflectance spectrum peak schematic diagram of superstructure polarization-maintaining fiber grating in the utility model.Between its reflection peak interval narrow, be evenly distributed, there is the features such as high reflectivity.
As shown in Figure 2, in the tunable narrow-linewidth single-frequency linearly polarized laser device of this example, pumping source 1, first collimating lens 3, laser Effect of Back-Cavity Mirror 4, thermo-optic tunable filter 5, second collimating lens 7, the highly doped multicomponent glass optical fiber 8 of rare earth ion, superstructure polarization-maintaining fiber grating 9, guarantor's polarisation isolator 11, polarization maintaining optical fibre 12 are arranged from left to right, and pumping source 1, thermo-optic tunable filter 5, superstructure polarization-maintaining fiber grating 9 are arranged on a thermoelectric refrigerating unit TEC all separately.Above-mentioned overall light path and all optical devices be fixedly encapsulated in a metal material heat sink among, to dispel the heat.
Single-frequency laser resonant cavity in the utility model is made up of together with superstructure polarization-maintaining fiber grating Effect of Back-Cavity Mirror, thermo-optic tunable filter, collimating lens, and wherein superstructure polarization-maintaining fiber grating plays the effect of front cavity mirror.Use pumping source to carry out pumping pumping to single-frequency laser resonant cavity, the pumping laser exported due to pumping source is divergent shape, needs to be collimated light beam by collimating lens, then is of coupled connections with Effect of Back-Cavity Mirror low-loss.
The thermo-optic tunable filter of this example is a kind of F-P type film filter, according to the distribution of required pectination peak transmission wavelength, can design the number of plies and the optical thickness parameter of its film.Thermo-optic tunable filter 5 carries out precision temperature control by independently the second thermoelectric refrigerating unit TEC6, causes thermo-optic effect, the refractive index of its dielectric multi-layer optical thin film material is changed by temperature regulating and controlling, thus it is tunable to reach pectination transmission peak wavelength.
The highly doped multicomponent glass optical fiber of rare earth ion is as the gain media of laser, and general use length is 0.5 ~ 50cm, and within the scope of this, concrete length can carry out corresponding selection according to the requirement of laser output power size, live width size.The fibre core of multicomponent glass optical fiber is the rare earth luminous ion (combined situation of one or more in lanthanide ion, alkaline-earth metal ions, transition metal ions) of high-dopant concentration, and wherein the doping content of rare earth luminous ion requires to be greater than 1 × 10
20ions/cm
3.Its core shape is circular, and core diameter is generally 3 ~ 50 μm; Cladding shape is circle, D shape, hexagon, octagon etc., and cladding diameter or limit are generally 80 ~ 900 μm to back gauge.One end of multicomponent glass optical fiber plates multi-layered antireflection coating, and described pellicle film is thoroughly high to laser signal wavelength, and transmissivity is greater than 90%, reflects for suppressing the light of fiber end face.
In this example, pumping source 1 output wavelength is 980nm, and pump power is 750mW; Wherein thermo-optic tunable filter 5 is regulated by precision temperature, and its thermo-optic effect can distribute at its pectination max transmissive peak tuning; The eyeglass end face of laser Effect of Back-Cavity Mirror 4 plates film, and pellicle film is 99% to laser signal wavelength reflectivity; To pump wavelength transmissivity 99%.Laser gain work is completed together with superstructure polarization-maintaining fiber grating 9 by Yb codoped phosphate glass optical fiber 8.Be coupled into Yb codoped phosphate glass optical fiber 8 when transmitted light collimates after collimating lens 7, one end end face of Yb codoped phosphate glass optical fiber 8 is coated with multi-layered antireflection coating.The other end of Yb codoped phosphate glass optical fiber 8 is connected with superstructure polarization-maintaining fiber grating 9 melting, superstructure polarization-maintaining fiber grating 9 carries out precision temperature by the 3rd thermoelectric refrigerating unit TEC10 and regulates and can distribute at its pectination maximum reflection peak tuning, the max transmissive peak of itself and thermo-optic tunable filter 5 is overlapped at a certain wavelength location place, formation optical maser wavelength is fed back, and final laser exports with the tail optical fiber of polarization maintaining optical fibre 12 is stable through protecting polarisation isolator 11.
Wherein Yb codoped phosphate glass optical fiber 8 is as the gain media of laser, and this example uses length to be 1.5cm.Its fibre core main component is phosphate glass component (composition: 65P
2o
5-10Al
2o
3-20BaO-3La
2o
3-2Nd
2o
3).The rare earth luminous ion erbium of its fibre core Uniform Doped high concentration and ytterbium, its doping content is respectively 2.5 × 10
20ions/cm
3, 5.0 × 10
20ions/cm
3, its core diameter is 6 μm and cladding diameter is 125 μm, and shape is circle.Yb codoped phosphate glass optical fiber 8 one end end face plates multi-layered antireflection coating, and pellicle film is 99.9% to laser signal wavelength transmissivity; Wherein the center reflection wavelength of superstructure polarization-maintaining fiber grating 9 is positioned at the gain spectral of gain medium, and its reflectivity is 70%.
Wherein pump mode adopts forward pumping, pumping source 1 injects the fibre core of pump light to Yb codoped phosphate glass optical fiber 8, make its rare earth luminous ion generation population inversion, produce the laser signal of stimulated radiation, flashlight transmits along light path two ends, on the one hand, light from the left end outgoing of Yb codoped phosphate glass optical fiber 8 through collimating lens 7, the distribution of pectination peak transmission wavelength is formed again through thermo-optic tunable filter 5 transmission filtering, then by laser back cavity eyeglass 4, light is returned along identical path, and collimation is coupled into the fibre core of Yb codoped phosphate glass optical fiber 8, form bulk of optical feedback.On the other hand, light reflects from the right-hand member outgoing of Yb codoped phosphate glass optical fiber 8 through superstructure polarization-maintaining fiber grating 9, present pectination reflection peak Wavelength distribution, itself and the transmitted spectrum of thermo-optic tunable filter are coupled, and overlapping to produce coherent phase long, constantly produces bulk of optical feedback effect.In tuning process, regulate respectively by accurate temperature control, the reflection peak Wavelength distribution that can continuously change superstructure polarization-maintaining fiber grating and the peak transmission wavelength distribution changing thermo-optic tunable filter, pectination maximum reflection peak is made to carry out overlapping with max transmissive peak in other a certain wavelength location, namely overlapping wavelengths position can be made to recur change, obtain the maximum feedback at different wave length place and sharp lase, namely real-time and continuous print changes the output wavelength of laser.Again by accurately controlling the optical parametric such as reflectance spectrum, centre wavelength of superstructure polarization-maintaining fiber grating, when the spectrum of thermo-optic tunable filter and the overlapping wavelength of super-structure optical fiber grating is narrow extremely to a certain degree, and control below certain length by long for whole laserresonator chamber, thus can ensure only there is a single longitudinal mode operation in laser cavity, and occur without mode hopping and mode competition phenomenon.When laser is under feedback effect, repeatedly oscillate repeatedly being amplified, before laser power is saturated, along with the continuous enhancing of pump power, single-frequency laser live width will constantly narrow, and finally realizes the tunable narrow-linewidth single-frequency linearly polarized laser that laser linewidth is less than 10kHz, extinction ratio is greater than 25dB, power output is greater than 100mW and exports.Pumping source carries out temperature control by independently the first thermoelectric refrigerating unit TEC 2, ensures the stability of its output wavelength and pump power.
As shown in Figure 3, be TEC temperature control mode in the utility model embodiment and encapsulation schematic diagram.Pumping source 1 is placed in above the first thermoelectric refrigerating unit TEC2 and carries out precision temperature control, ensure the operating central wavelength of pump laser and the stability of power output.Thermo-optic tunable filter 5 is placed in above the second thermoelectric refrigerating unit TEC6, fine adjustment can control its temperature.Superstructure polarization-maintaining fiber grating 9 is placed in above the 3rd thermoelectric refrigerating unit TEC10, also fine adjustment can control its temperature.Above-mentioned all light paths and optical device are fixedly encapsulated in above a metal heat sink 13, effectively carry out heat dissipation, ensure job stability and the reliability of single-frequency linearly polarized laser power output, output wavelength.
Claims (6)
1. a tunable narrow-linewidth single-frequency linearly polarized laser device, is characterized in that comprising heat sink (13) and is encapsulated in pumping source (1), the first collimating lens (3), laser Effect of Back-Cavity Mirror (4), thermo-optic tunable filter (5), the second collimating lens (7), the highly doped multicomponent glass optical fiber of rare earth ion (8), superstructure polarization-maintaining fiber grating (9) on heat sink (13), protects polarisation isolator (11), polarization maintaining optical fibre (12) and thermoelectric refrigerating unit TEC; Described pumping source (1), the first collimating lens (3), laser Effect of Back-Cavity Mirror (4), thermo-optic tunable filter (5), the second collimating lens (7), the highly doped multicomponent glass optical fiber of rare earth ion (8), superstructure polarization-maintaining fiber grating (9), guarantor's polarisation isolator (11), polarization maintaining optical fibre (12) are arranged in turn, and pumping source (1), thermo-optic tunable filter (5), superstructure polarization-maintaining fiber grating (9) are arranged on a thermoelectric refrigerating unit TEC all separately;
The output of described pumping source is of coupled connections through the first collimating lens and laser Effect of Back-Cavity Mirror, laser Effect of Back-Cavity Mirror is connected with thermo-optic tunable is filter coupled, thermo-optic tunable filter and the second collimating lens are of coupled connections, the input of the second collimating lens and the highly doped multicomponent glass optical fiber of rare earth ion is of coupled connections, the output of the highly doped multicomponent glass optical fiber of rare earth ion and the input of superstructure polarization-maintaining fiber grating are of coupled connections, the output of superstructure polarization-maintaining fiber grating is of coupled connections with the input protecting polarisation isolator, the output protecting polarisation isolator is connected with the pigtail coupling of polarization maintaining optical fibre.
2. tunable narrow-linewidth single-frequency linearly polarized laser device as claimed in claim 1, is characterized in that the eyeglass end face of described laser Effect of Back-Cavity Mirror (4) is coated with thin layer.
3. tunable narrow-linewidth single-frequency linearly polarized laser device as claimed in claim 1, is characterized in that described thermo-optic tunable filter (5) is for F-P type film tunable filter.
4. tunable narrow-linewidth single-frequency linearly polarized laser device as claimed in claim 1, it is characterized in that the core shape of the highly doped multicomponent glass optical fiber of described rare earth ion (8) is for circular, core diameter is 3 ~ 50 μm, cladding shape is circle, D shape, hexagon or octagon, and wherein the diameter of circular covering or the limit of non-circular covering are 80 ~ 900 μm to back gauge.
5. tunable narrow-linewidth single-frequency linearly polarized laser device as claimed in claim 1, is characterized in that one end of the highly doped multicomponent glass optical fiber of described rare earth ion (8) is coated with multi-layered antireflection coating.
6. tunable narrow-linewidth single-frequency linearly polarized laser device as claimed in claim 1, is characterized in that the semiconductor laser that described pumping source (1) is edge emitting structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420032269.3U CN204290019U (en) | 2014-01-17 | 2014-01-17 | A kind of tunable narrow-linewidth single-frequency linearly polarized laser device |
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| CN114384631A (en) * | 2022-01-14 | 2022-04-22 | 厦门贝莱信息科技有限公司 | Manufacturing method of sintered and fused 980-1550nm optical isolator |
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| CN114384631A (en) * | 2022-01-14 | 2022-04-22 | 厦门贝莱信息科技有限公司 | Manufacturing method of sintered and fused 980-1550nm optical isolator |
| CN114384631B (en) * | 2022-01-14 | 2024-04-19 | 厦门贝莱信息科技有限公司 | Manufacturing method of sintered and fused 980-1550nm optical isolator |
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