CN103259172B - Radio frequency modulation tunable all-fiber laser based on fiber loop mirror - Google Patents
Radio frequency modulation tunable all-fiber laser based on fiber loop mirror Download PDFInfo
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- CN103259172B CN103259172B CN201310141662.6A CN201310141662A CN103259172B CN 103259172 B CN103259172 B CN 103259172B CN 201310141662 A CN201310141662 A CN 201310141662A CN 103259172 B CN103259172 B CN 103259172B
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Abstract
The invention discloses a radio frequency modulation tunable all-fiber laser based on a fiber loop mirror. The radio frequency modulation tunable all-fiber laser based on the fiber loop mirror is characterized in that one arm of the fiber loop mirror, a dual-cladding non-doped fiber, a dual-cladding doped fiber, a signal optical channel of a wavelength division multiplexer and an output tail fiber are sequentially connected in a welding mode end-to-end. A pumping source is connected with a pumping source optical channel of the wavelength division multiplexer in a welding mode. A fiber fixing traction support comprises a left lobe and a right lobe. The dual-cladding non-doped fiber is wound in a groove outside the fiber fixing traction support and tightened. A triangular prism support is arranged on piezoelectric ceramic, and cushion blocks are arranged at the bottom of the piezoelectric ceramic. The piezoelectric ceramic is connected with a radio frequency power source. According to radio frequency modulation tunable all-fiber laser based on the fiber loop mirror, by the adoption of the tuned radio frequency mode, ultrasonic vibration is utilized to form a long period fiber grating with an adjustable period, wavelength tuning of the fiber laser is achieved, a full-fiber structure without discrete component is adopted in the fiber laser, and no inserting loss is generated, so that optical quality is good, output power is high, the 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 based on fiber loop mirror.
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.
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 based on fiber loop mirror, this laser inserts very little, its one end adopts fiber loop mirror as wide range completely reflecting mirror, the other end adopts the Fei Nier reflection of 4% of fiber cut end face 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.
To achieve these goals, the present invention adopts following technical scheme to be solved:
A kind of rf modulations tunable whole-optical fibre laser based on fiber loop mirror, comprise fiber loop mirror, tractive support fixed by optical fiber, triangular prism support, piezoelectric ceramic, cushion block, radio-frequency power supply, double clad undoped optical fiber, double-cladding doped fiber, wavelength division multiplexer, pumping source and output tail optical fiber, wherein, a wherein arm of described fiber loop mirror, double clad undoped optical fiber, double-cladding doped fiber, the flashlight passage of wavelength division multiplexer and export tail optical fiber and to join end to end welding successively, another arm sling sky of fiber loop mirror need not, the pump light passage welding of pumping source and wavelength division multiplexer, described optical fiber is fixed tractive support and is comprised left lobe and right lobe, is connected between described left lobe and right lobe by rigid cage, left lobe, right lobe are cylinder flat in outer arc, and left lobe, right lobe outer arc carve multiple parallel groove, double clad undoped optical fiber to be fixed around optical fiber in the groove of tractive bracket outer and is 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, described piezoelectric ceramic connects radio-frequency power supply.
The present invention also comprises following other technologies feature:
Described piezoelectric ceramic passes into the vibration that radio-frequency power supply causes double clad undoped optical fiber, 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 output frequency of radio-frequency power supply changes the movement making long-period gratings absorption spectra, 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 the output frequency of radio frequency to realize the output wavelength needed.
Distance between described left lobe and right lobe is 8cm ~ 30cm.
Described left lobe, right lobe are semicolumn, semiellipse post or rectangular band semicolumn.
Separation adjacent on described left lobe, right lobe is 2mm ~ 5mm, and groove depth is 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 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 fiber loop mirror adopts coupling ratio to be 50:50.
The signal end of described wavelength division multiplexer is as output tail optical fiber, and the Fei Nier exporting 4% of the cut surface of tail optical fiber is reflected into outgoing mirror.
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, 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 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 the graph of a relation of the radio frequency output frequency of radio-frequency power supply and the output wavelength of laser of the present invention.
Below in conjunction with the drawings and specific embodiments, further explanation is explained to the present invention.
Embodiment
See Fig. 1, rf modulations tunable whole-optical fibre laser based on fiber loop mirror of the present invention, comprise 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 and output tail optical fiber 11, wherein, a wherein arm of fiber loop mirror 1, double clad undoped optical fiber 7, double-cladding doped fiber 8, the flashlight passage of wavelength division multiplexer 9 and export tail optical fiber 11 and to join end to end welding successively, another arm sling sky of fiber loop mirror 1 need not, the pump light passage welding of pumping source 10 and wavelength division multiplexer (9), the full-optical-fiber laser of the present invention of above-mentioned parts composition is divided into four parts from principle, is resonant cavity, gain fibre, unpumped section and tunable optic filter respectively.
Resonant cavity is made up of fiber loop mirror 1 and outgoing mirror, fiber loop mirror 1 is the passive device together formed by two output port fused fiber splices of the melting cone type broadband optical fiber coupler of 2 × 2, coupling ratio is 50:50, and its effect is equivalent to completely reflecting mirror, requires that its reflectivity is more than or equal to 95%; Outgoing mirror adopts and is directly cut by the signal end of wavelength division multiplexer 9, also namely reflects as outgoing mirror using the Fei Nier 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 technique07.].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, all input luminous energy will be exported by incidence end, and medium its reflection characteristic identical that the light due to both direction is advanced shows as wavelength and has nothing to do, so it can be used as a wide range completely reflecting mirror, serve as the end mirror of fiber laser.What all adopt due to end mirror and outgoing mirror is wide range speculum, and it does not have frequency-selecting effect to laser output wavelength, and namely laser output wavelength, only by the impact of net gain spectrum, also equals the highest-gain wavelength of net gain spectrum.Such laser output wavelength is by consistent with the gain spectral centre wavelength of gain fibre and double-cladding doped fiber 8.
Gain fibre and double-cladding doped fiber 8, its can adopt existing any one there is double clad single-mode fiber compared with wide gain spectrum, as long as the gain spectral of the absorption spectra and gain fibre that can meet the tunable optic filter of employing has 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 that the output mode of laser selects corresponding core size and fibre core numerical aperture; According to the absorbing state of double-cladding doped fiber 8 pairs of pumpings, 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, and tunable optic filter 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 and right lobe 22, is connected and both distances (i.e. the length of rigid cage 23) are 8cm ~ 30cm between described left lobe 21 and 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 physical dimension of the filter, dielectric of tunable optic filter and double clad undoped optical fiber 7 needs to mate completely with gain fibre, is convenient to welding like this and loss is less.Double clad undoped optical fiber 7 to be fixed around optical fiber in the groove 25 of tractive support 2 outside and to strain, then triangular prism support 3 is placed on piezoelectric ceramic 4, bottom piezoelectric ceramic 4, cushioning cushion block 5 makes the rib contact double clad undoped optical fiber 7 at triangular prism support 3 top, is formed and is similar to the string of seven-stringed plucked instrument in some ways similar to the zither and the structure of support.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, 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, its center absorption spectra 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 this long period fiber grating, when the absorption spectra of this long period fiber grating and the gain spectral of gain fibre occur overlapping, by the centre wavelength regulating the output frequency of radio-frequency power supply 6 just can change net gain spectrum, realize tunable Output of laser.
In the said structure of tunable optic filter, being wrapped in the number of turns that optical fiber fixes the double clad undoped optical fiber 7 of tractive support 2 outside is 1-8 circle, the number of turns is more, the degree of depth of absorption spectra is darker, the general width according to the gain spectral of gain media and intensity select the suitable number of turns, get at effectively be modulated to principle with Danone.
In the structure shown here, mode coupling effect is relevant with fibre diameter with the intensity that radio frequency vibrates, vibrational energy is more, coupling efficiency is higher, the thinner coupling effect of optical fiber is more obvious, particularly when after the surrounding layer taking down double clad undoped optical fiber 7, coupling effect is obviously strengthened, trace it to its cause and be that surrounding layer is resin material, the fibre core stayed after being removed and inner wrap material are quartz glass, vibrating effect is obviously strengthened, and absorbs the degree of depth and also strengthens a lot, can reduce the requirement of radio frequency power supply 6 power output 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 value is-0.1 ~-1nm/KHz, and along with the increase of rf frequency, absorbent core wavelength blue shift can occur.
Unpumped section is used for providing laser works institute energy requirement, is made up of pumping source 10 and wavelength division multiplexer 9.The semiconductor laser that pumping source 10 adopts band tail optical fiber to export, its output wavelength need meet the pumping wavelength required by gain fibre, and the power output size that then laser according to the present invention requires selects corresponding pump power.Pump light is exported by pumping source 10, the inner cladding of double-cladding doped fiber 8 is coupled into through wavelength division multiplexer 9, 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 supports 3, piezoelectric ceramic 4, cushion block 5, radio-frequency power supply 6 and double clad undoped optical fiber 7 is fixed by increasing optical fiber, 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.
Embodiment:
As shown in Figure 1, follow technique scheme of the present invention, the rf modulations tunable whole-optical fibre laser based on fiber loop mirror of the present embodiment, comprise resonant cavity, gain fibre, pumping source and tunable optic filter four part.
Resonant cavity: completely reflecting mirror is coupling ratio is 50:50 fiber loop mirror, outgoing mirror is 4% non-Neil reflection of the fiber cut end face exporting tail optical fiber 11, and 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.
Unpumped section: pumping source 10 selects the output tail optical fiber of 790nm to be 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 2 at optical fiber and pushes down with press strip 24 after 4 circles, every turn separation 2mm, optical fiber fixes the upper left lobe of tractive support 2 21, right lobe 22 all than triangular prism support 3 top height 1cm; The surrounding layer of oscillating component optical fiber is removed.Piezoelectric ceramic 4 adopts and is of a size of the rectangular sheet of 45*8*5mm.
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 12 from double clad undoped optical fiber 7 one end via lens 13, this light source light spectrum scope should comprise the fluorescence Spectra of doped chemical in double-cladding doped fiber 8, spectrometer 14 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 the absorption spectra that vibration that radio-frequency current causes produces, absorption spectra is compared with the gain fluorescence Spectra of double-cladding doped fiber 8, frequency corresponding to intersection is exactly the tuning range corresponding to radio-frequency power supply 6.
Shown in Figure 3 is the experimental relationship figure of the radio frequency output frequency of radio-frequency power supply 6 in the present embodiment and the output wavelength of laser, therefore, according to the radio frequency output frequency of the output wavelength adjustment radio-frequency power supply 6 that laser of the present invention needs, in this example, radio frequency Drazin inverse scope is 1MHz ~ 1.5MHz.Make radio frequency power output be intended to be good meeting compared with gain spectral by absorption spectra, this parameter also obtains by experimental technique.
Complete above-mentioned device to select and test, by the multiplexing end of the 1st arm of fiber loop mirror 1, double clad undoped optical fiber 7, double-cladding doped fiber 8, wavelength division multiplexer 9 successively head and the tail phase welding, the pumping input of pumping source 10 with wavelength division multiplexer 9 is melted mutually, the signal end of wavelength division multiplexer 9 is as output tail optical fiber 11, the signal end of wavelength division multiplexer 9 is directly cut, reflect as output reflector using the non-Neil of cut end face 4%, 2nd arm sling of fiber loop mirror 1 is empty, requires that fibre core is aimed at during welding.
Claims (10)
1. the rf modulations tunable whole-optical fibre laser based on fiber loop mirror, it is characterized in that, comprise 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) and output tail optical fiber (11), wherein, a wherein 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 export tail optical fiber (11) and to join end to end welding successively, another arm sling sky of fiber loop mirror (1) need not, the pump light passage welding of pumping source (10) and wavelength division multiplexer (9), described optical fiber is fixed tractive support (2) and is comprised left lobe (21) and right lobe (22), is connected between described left lobe (21) and right lobe (22) by rigid cage (23), left lobe (21), right lobe (22) are cylinder flat in outer arc, and left lobe (21), right lobe (22) outer arc carve multiple parallel groove (25), double clad undoped optical fiber (7) to be fixed in the outside groove (25) of tractive support (2) around optical fiber and is 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, described piezoelectric ceramic (4) connects radio-frequency power supply (6).
2. as claimed in claim 1 based on the rf modulations tunable whole-optical fibre laser of fiber loop mirror, it is characterized in that, described piezoelectric ceramic (4) causes double clad undoped optical fiber (7) to vibrate when passing into radio-frequency power supply (6), 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 the output frequency of radio-frequency power supply (6) to realize the output wavelength needed.
3., as claimed in claim 1 based on the rf modulations tunable whole-optical fibre laser of fiber loop mirror, it is characterized in that, the distance between described left lobe (21) and right lobe (22) is 8cm ~ 30cm.
4., as claimed in claim 1 based on the rf modulations tunable whole-optical fibre laser of fiber loop mirror, it is characterized in that, described left lobe (21), right lobe (22) are semicolumn, semiellipse post or rectangular band semicolumn.
5. as claimed in claim 1 based on the rf modulations tunable whole-optical fibre laser of fiber loop mirror, 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., as claimed in claim 1 based on the rf modulations tunable whole-optical fibre laser of fiber loop mirror, it is characterized in that, described left lobe (21), right lobe (22) top are equipped with press strip (24).
7., as claimed in claim 1 based on the rf modulations tunable whole-optical fibre laser of fiber loop mirror, it is characterized in that, the drift angle of described triangular prism support (3) is with 30 ° ~ 60 °.
8. as claimed in claim 1 based on the rf modulations tunable whole-optical fibre laser of fiber loop mirror, 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. as claimed in claim 1 based on the rf modulations tunable whole-optical fibre laser of fiber loop mirror, it is characterized in that, described fiber loop mirror (1) adopts coupling ratio to be 50:50.
10. as claimed in claim 1 based on the rf modulations tunable whole-optical fibre laser of fiber loop mirror, it is characterized in that, the signal end of described wavelength division multiplexer (9) is as output tail optical fiber (11), and the Fei Nier exporting 4% of the cut surface of tail optical fiber (11) is reflected into outgoing mirror.
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| CN104466634B (en) * | 2014-11-25 | 2017-10-31 | 武汉光迅科技股份有限公司 | A kind of linear cavity doped fiber laser |
| CN105137624B (en) * | 2015-09-25 | 2019-02-22 | 西北工业大学 | Generate the device and method of column vector beam in a fiber using automatically controlled tunable gratings |
| CN117589312A (en) * | 2024-01-16 | 2024-02-23 | 中国工程物理研究院激光聚变研究中心 | Wavelength following characteristic measuring device and method for semiconductor laser pumping source |
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| US6801686B2 (en) * | 1997-06-06 | 2004-10-05 | Novera Optics, Inc. | Methods and apparatus for measuring the power spectrum of optical signals |
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| US6631224B2 (en) * | 1997-06-06 | 2003-10-07 | Novera Optics, Inc. | Tunable filter with core mode blocker |
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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 |
| US6801686B2 (en) * | 1997-06-06 | 2004-10-05 | Novera Optics, Inc. | Methods and apparatus for measuring the power spectrum of optical signals |
| US6950566B1 (en) * | 2003-08-27 | 2005-09-27 | Novera Optics, Inc. | Method and apparatus for an acousto-optic filter that generates a helical wave and method for manufacturing same |
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