CN201166768Y - Full fibre-optical narrow-line broad pulse signal apparatus - Google Patents
Full fibre-optical narrow-line broad pulse signal apparatus Download PDFInfo
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- CN201166768Y CN201166768Y CNU2007201991878U CN200720199187U CN201166768Y CN 201166768 Y CN201166768 Y CN 201166768Y CN U2007201991878 U CNU2007201991878 U CN U2007201991878U CN 200720199187 U CN200720199187 U CN 200720199187U CN 201166768 Y CN201166768 Y CN 201166768Y
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- optical fiber
- fiber
- ytterbium
- amplifier
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Abstract
An all-fiber narrow-line width wide-pulse signaling device comprises a distributed feedback optical fiber laser, an acousto-optic chopper, an ytterbium-doped single-mode optical fiber pre-amplifier and an optical fiber beam splitter connected sequentially. 90% of the output terminal of the optical fiber beam splitter is spliced with the signal terminal of a multi-mode pumping beam mixer. The output tail fiber of the multi-mode pumping beam mixer is spliced with the optical fiber of an ytterbium-doped double-coated optical fiber amplifier, and the pumping terminal thereof is connected with a multi-mode semiconductor laser. The output terminal surface of the tail fiber of the ytterbium-doped double-coated optical fiber amplifier has an 8-degree inclined surface. The backward output monitoring terminal of the optical fiber beam splitter is connected with an optical fiber isolator. The signaling device has the advantages of narrow line width, fundamental transverse mode, single longitudinal mode, good stability and no shape distortion of the high-power pulse, and is easily packaged and subjected to less environmental influence.
Description
Technical field
The utility model relates to laser, particularly a kind of full optical fiber narrow linewidth pulse signal device, it is a kind of hundred ps pulsed laser and ns pulsed laser signal sources of utilizing yb-doped double-clad fiber to realize, its advantage is a good beam quality, narrow linewidth, fundamental transverse mode, single longitudinal mode, and realizing that the 200ns square wave is almost undistorted under the high-power situation, this device can be applicable to strict to live width, power and pulse shape simultaneously occasion.
Background technology
The signal source module that utilizes optical fiber to realize has good beam quality, the efficient height, and advantages such as high stability, compact conformation have been widely used in fields such as communication, industry and medical science.Mix ytterbium (Yb
3+) silica fibre belongs to simple two level structures, has wide absorption spectra, gain bandwidth (GB) and tuning range, quantum efficiency height, characteristics such as no excited state absorption, no concentration quenching; And because the special construction of doubly clad optical fiber, pump light can be propagated and realize the high power coupling of pump light and absorb in the covering of heavy in section, large-numerical aperture, improve the stored energy in the amplifier, realizes effective amplification of flashlight.These advantages make yb-doped double-clad fiber more and more cause people's extensive concern.
Although the big mode field area fibers (LMF) that extensively utilizes can effectively reduce the power density in the fiber core at present, improve non-linear threshold, realize long pulse signal high power, undistorted amplification, but because core diameter more than 10 μ m, can not guarantee the fundamental transverse mode transport property of light beam in the amplification process; Though and the common single mode optical fibres amplifier can guarantee single transverse mode characteristic of light beam, but because storable finite energy in the optical fiber, when hundred nanosecond pulses are amplified, along with the increase of signal power is easy to make amplifier gain saturated, cause the pulse shape distortion, the line width of can not satisfying the demand, high power, fundamental transverse mode, the distortionless situation of single longitudinal mode and pulse shape, for example, install the front-end driven system in the process of integrated direction development at inertial confinement fusion (ICF), before entering the beam splitter array, not only require the power height, pulse shape is undistorted, and requires good beam quality, the fundamental transverse mode single longitudinal mode.Simultaneously a lot of high-power amplifiers adopt the structure of Lens Coupling flashlights and pump light, and coupling is regulated difficult, and coupling efficiency is low, and structural instability is affected by environment bigger, these drawbacks limit its application in many instances.
Summary of the invention
The technical problems to be solved in the utility model is to overcome above-mentioned the deficiencies in the prior art, a kind of full optical fiber narrow linewidth pulse signal device is provided, and this device should be realized the laser pulse amplifying signal output of narrow linewidth, high power, fundamental transverse mode, single longitudinal mode and good stability.
Technical solution of the present utility model is as follows:
A kind of full optical fiber narrow linewidth pulse signal device, constitute and comprise the distributed feedback optical fiber laser that connects successively, the acousto-optic chopper, mix ytterbium single-mode fiber prime amplifier, fiber optic splitter, in 90% output terminal of this fiber optic splitter and the signal end welding mutually of multimode pump combiner, the optical fiber welding mutually of the output tail optical fiber of this multimode pump combiner and ytterbium-doped double-clad fiber amplifier, the pumping termination multiple die semiconductor laser instrument of this multimode bundling device, the output end face of the tail optical fiber of described ytterbium-doped double-clad fiber amplifier has 8 ° inclined-plane, described fiber optic splitter back to output monitoring terminated optical fiber isolator.
The described ytterbium single-mode fiber prime amplifier of mixing has bandwidth 1nm optical fiber filter.
Described multimode pump combiner output tail optical fiber is the non-doped fiber of double clad, the inner cladding diameter is 125 μ m, numerical aperture 0.45, core diameter 4 μ m, numerical aperture 0.12, the inner cladding diameter of described ytterbium-doped double-clad fiber amplifier are 130 μ m, numerical aperture 0.46, fibre core mode field diameter 6.5 μ m, numerical aperture 0.12.
The output termination high-power fiber optic isolator of described ytterbium-doped double-clad fiber amplifier.
Experiment shows, amplification pulse signal of the present utility model has narrow linewidth, fundamental transverse mode, single longitudinal mode, good stability and in the distortionless advantage of high power pulse shape, easily encapsulation and affected by environment less.
Description of drawings
Fig. 1 is the structural representation of the full optical fiber narrow linewidth of the utility model pulse signal device.
Among the figure:
The 1-distributed feedback optical fiber laser; 2-acousto-optic chopper; 3-mixes ytterbium single-mode fiber prime amplifier; The 4-fiber optic splitter; The 5-ytterbium-doped double-clad fiber amplifier; The 6-fibre optic isolater; 7-multimode pump combiner;
Embodiment
The utility model is described in further detail below in conjunction with embodiment and accompanying drawing, but should not limit protection domain of the present utility model with this.
See also Fig. 1 earlier, Fig. 1 is the structural representation of the full optical fiber narrow linewidth of the utility model pulse signal device.It also is the structural representation of the utility model embodiment 1, as seen from the figure, the formation of the narrow linewidth hundred nanosecond pulse telltale of the full optical fiber of the utility model comprises the distributed feedback optical fiber laser 1 that connects successively, acousto-optic chopper 2, mix ytterbium single-mode fiber prime amplifier 3, fiber optic splitter 4, the signal end welding mutually of 90% output terminal of this fiber optic splitter 4 and multimode pump combiner 7, the optical fiber welding mutually of the output tail optical fiber of this multimode pump combiner 7 and ytterbium-doped double-clad fiber amplifier 5, the pumping termination multiple die semiconductor laser instrument LD2 of this multimode bundling device 7, the output end face of the tail optical fiber of described ytterbium-doped double-clad fiber amplifier 5 has 8 ° of inclined-planes, described fiber optic splitter 4 back to output monitoring terminated optical fiber isolator 6.
In the present embodiment, described distributed feedback optical fiber laser 1 is to adopt output linewidth very narrow (distributed feedback optical fiber laser of＜100KHz) centre wavelength 1 μ m is made the signal seed light, through obtaining pulse signal behind the acousto-optic chopper 2, this pulse signal is that repetition frequency is that the pulsewidth of 1Hz is the square-wave pulse of 200ns; The described ytterbium single-mode fiber prime amplifier 3 of mixing has bandwidth 1nm optical fiber filter, semiconductor laser LD1 makes to mix the pumping source of ytterbium single-mode fiber prime amplifier 3, this is mixed ytterbium single-mode fiber prime amplifier 3 and amplifies weak pulse towards signal, the bandwidth 1nm optical fiber filter of output terminal, the filtering spontaneous emission noise improves signal to noise ratio (S/N ratio).
Pumping source as ytterbium-doped double-clad fiber amplifier 5 is wavelength 970nm, the multiple die semiconductor laser instrument LD2 of peak power output 2W.Multimode pump combiner 7 can realize the high coupling efficiency of pumping and flashlight, and the pump light coupling efficiency is 95%, and the flashlight coupling efficiency is 86%; Described ytterbium-doped double-clad fiber amplifier 5 is mixed Yb optical fiber by the 12m double clad and is constituted, and can realize power amplification to the pulsed light of centre wavelength 1 μ m pulsewidth 200ns.Multimode pump combiner 7 output tail optical fibers are the non-doped fiber of double clad, and the inner cladding diameter is 125 μ m, numerical aperture 0.45, core diameter 4 μ m, numerical aperture 0.12.The inner cladding diameter of the doubly clad optical fiber of described ytterbium-doped double-clad fiber amplifier 5 is 130 μ m, numerical aperture 0.46, fibre core mode field diameter 6.5 μ m, numerical aperture 0.12.Optical fiber parameter mates substantially, the direct welding of output tail optical fiber of Yb-doped double-cladding optical fiber and multimode pump combiner 7, and its splice loss, splice attenuation is less than 1dB; Adopt 8 ° of inclined-plane outputs, in amplifier, form self-sustained oscillation, break system device to prevent amplified spont-aneous emission light (ASE).Described fiber optic splitter 4 has adopted 90: 10 beam splitters of wavelength 1 μ m, this beam splitter 4 has two forward output terminals and an inverse output terminal, thereby can realize input signal monitoring and oppositely output power and pulse waveform monitoring simultaneously, the splitting ratio of two forward output terminals is 90: 10.Because backward supervision output terminal fiber end face and forward direction amplifying signal output optical fibre end face form cavity oscillation easily, so at reverse output monitoring terminated optical fiber isolator 6, to avoid exporting the light generation phenomenon of pulse effectively, further improve pulse power, and the square-wave pulse shape is undistorted.Simultaneously, because the fiber core mode field diameter that adopts has effectively guaranteed the fine beam quality of output pulsed base transverse mode single longitudinal mode all about 6 μ m in the system.
On operation steps, seed light source distributed feedback optical fiber laser 1 output continuous signal light, live width＜100KHz, power 8mW, obtain repetition frequency 1Hz through acousto-optic chopper 2, the pulse signal of pulsewidth 200ns, amplify and the filtering of 1nm bandwidth through mixing ytterbium single-mode fiber prime amplifier 3 again, enter in the double-cladding fiber amplifier 5, open pumping source by beam splitter 4 and multimode pump combiner 7, centre wavelength 970nm, progressively increase pump power, input signal monitoring client monitoring input pulse waveform, the backward supervision end is observed reverse output pulse waveform, the generation of non-linear phenomena in the detecting amplifier in real time, 8 degree inclined-plane output terminals are observed output pulse waveform through the optical fiber coupling, amplify through the 12m doubly clad optical fiber, obtain peak power 3W, stability 2.1%rms, the distortionless 200ns square wave output of pulse.
In the present embodiment, pulse signal is output as 8 degree inclined-plane outputs, observes pulse stability and need adopt the spatial light Lens Coupling to advance optical fiber, the instability of coupled system, make the instability of total output pulse bigger than normal, 8 degree inclined-plane spatial light outputs are also unsatisfactory, limit its application scenario.
Claims (4)
1, a kind of full optical fiber narrow linewidth pulse signal device, be characterised in that its formation comprises the distributed feedback optical fiber laser (1) that connects successively, acousto-optic chopper (2), mix ytterbium single-mode fiber prime amplifier (3), fiber optic splitter (4), in 90% output terminal of this fiber optic splitter (4) and the signal end welding mutually of multimode pump combiner (7), the optical fiber welding mutually of the output tail optical fiber of this multimode pump combiner (7) and ytterbium-doped double-clad fiber amplifier (5), the pumping termination multiple die semiconductor laser instrument of this multimode bundling device (7), the output end face of the tail optical fiber of described ytterbium-doped double-clad fiber amplifier (5) has 8 degree inclined-planes, described fiber optic splitter (4) back to output monitoring terminated optical fiber isolator (6).
2, full optical fiber narrow linewidth pulse signal device according to claim 1 is characterized in that the described ytterbium single-mode fiber prime amplifier (3) of mixing has bandwidth 1nm optical fiber filter.
3, full optical fiber narrow linewidth pulse signal device according to claim 1, it is characterized in that described multimode pump combiner (7) output tail optical fiber is the non-doped fiber of double clad, the inner cladding diameter is 125 μ m, numerical aperture 0.45, core diameter 4 μ m, numerical aperture 0.12, the optical fiber inner cladding diameter of described ytterbium-doped double-clad fiber amplifier (5) is 130 μ m, numerical aperture 0.46, fibre core mode field diameter 6.5 μ m, numerical aperture 0.12.
4, full optical fiber narrow linewidth pulse signal device according to claim 1 is characterized in that the output termination high-power fiber optic isolator of described ytterbium-doped double-clad fiber amplifier (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201991878U CN201166768Y (en) | 2007-12-13 | 2007-12-13 | Full fibre-optical narrow-line broad pulse signal apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201991878U CN201166768Y (en) | 2007-12-13 | 2007-12-13 | Full fibre-optical narrow-line broad pulse signal apparatus |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108267231A (en) * | 2018-03-19 | 2018-07-10 | 浙江师范大学 | High-capacity optical fiber laser power and SBS threshold on-Line Monitor Device |
| WO2019062123A1 (en) * | 2017-09-26 | 2019-04-04 | 北京万集科技股份有限公司 | Main oscillation amplifier of 1x1 monolithic integrated semiconductor |
| CN116667117A (en) * | 2023-07-03 | 2023-08-29 | 上海科乃特激光科技有限公司 | Single-frequency narrow linewidth fiber laser |
-
2007
- 2007-12-13 CN CNU2007201991878U patent/CN201166768Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019062123A1 (en) * | 2017-09-26 | 2019-04-04 | 北京万集科技股份有限公司 | Main oscillation amplifier of 1x1 monolithic integrated semiconductor |
| CN108267231A (en) * | 2018-03-19 | 2018-07-10 | 浙江师范大学 | High-capacity optical fiber laser power and SBS threshold on-Line Monitor Device |
| CN116667117A (en) * | 2023-07-03 | 2023-08-29 | 上海科乃特激光科技有限公司 | Single-frequency narrow linewidth fiber laser |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081217 Termination date: 20100113 |