CN207964098U - A kind of high-capacity optical fiber laser power and SBS threshold on-Line Monitor Device - Google Patents
A kind of high-capacity optical fiber laser power and SBS threshold on-Line Monitor Device Download PDFInfo
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- CN207964098U CN207964098U CN201820369242.1U CN201820369242U CN207964098U CN 207964098 U CN207964098 U CN 207964098U CN 201820369242 U CN201820369242 U CN 201820369242U CN 207964098 U CN207964098 U CN 207964098U
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Abstract
The utility model discloses a kind of high-capacity optical fiber laser power and SBS threshold on-Line Monitor Devices.The pumping input optical fibre of pump combiner in the utility model is connect with graded index multimode fiber one end, one end of the other end connection single mode optical fiber of graded index multimode fiber, the other end of single mode optical fiber and the input terminal of fibre optic isolater connect, the output end of fibre optic isolater is connected with the photodetector input terminal with tail optical fiber, photodetector output end connection signal control process circuit, the signal control processing circuit monitor that the variation relation of signal controls prime input signal light and pumping source by comparing.The utility model has the function of while monitoring output power and stimulated Brillouin scattering threshold value, be not necessarily to water cooling, it is cheap, compact-sized the advantages that.
Description
Technical field
The utility model belongs to Fiber laser technology field, more particularly to a kind of high-capacity optical fiber laser output power and
Stimulated Brillouin scattering（Stimulated Brillouin Scattering, SBS）Threshold value on-Line Monitor Device.
Background technology
Optical fiber laser have good beam quality, compact-sized, small, thermal diffusivity is good, the advantages such as easy care.Since double
Since cladded-fiber and high power pump source occur, hundreds of watts or more of high-capacity optical fiber laser is widely used to industry and adds
Work, as steel plate is cut.The finished surface meeting reflecting part of these commercial Applications is divided back laser system and laser output power is had
Shake, and then influence processing quality.In addition high-capacity optical fiber laser generally use master oscillation power amplification（master
oscillator power amplifier, MOPA）Structure realizes power amplification, especially for its power of narrow linewidth laser
Amplification is limited to stimulated Brillouin scattering, and the stokes light of generation can destroy backing system.Therefore very necessary to laser
Output power and stimulated Brillouin scattering threshold value carry out real time on-line monitoring.
Mainly have for the power monitoring of high-capacity optical fiber laser at present（1）Based on monitoring pumping source electromotive power output mark
Determine optical output power of laser；（2）The pump light filtered out based on monitoring pumping stripper demarcates output light（Patent
CN102322945A）.There are pumping sources can influence laser with temperature fluctuation and gain fibre itself fuel factor for the former
Output power, damage occur especially for optical fiber can not give warning in advance, thus demarcate there are deviation, also inconvenient malfunction elimination；
The latter needs to treat the doubly clad optical fiber divested and handle, and it is limited that the photo-curable glue used bears power capability, needs water
Device for cooling, it is complicated.Simultaneously it is to be noted that the above method all cannot be used for monitoring stimulated Brillouin scattering threshold value.Cause
This, invention one kind can monitor the compact-sized of high-capacity optical fiber laser output power and early warning stimulated Brillouin scattering
Cost-effective monitoring device is of great significance.
Invention content
The utility model is aiming at the deficiencies in the prior art, it is proposed that pumps input optical fibre based on monitoring pump combiner
Filter out reverse transfer pump light and high-order mode light after remaining fundamental signal light variation relation to output power and be excited
The miniaturization structure that Brillouin scattering is monitored in real time.
In order to solve the above-mentioned technical problem, the utility model uses following technological means：
The utility model includes graded index multimode fiber, single mode optical fiber, fibre optic isolater, photodetector and signal
The pumping input optical fibre of control process circuit, pump combiner is connect with graded index multimode fiber one end, graded index
One end of the other end connection single mode optical fiber of multimode fibre, the other end of single mode optical fiber and the input terminal of fibre optic isolater connect,
The output end of fibre optic isolater is connected with the photodetector input terminal with tail optical fiber, the control of photodetector output end connection signal
Processing circuit, the signal control processing circuit by compare monitor the variation relation of signal to prime input signal light and
Pumping source is controlled.
Furtherly, the graded index multimode fiber has two sections.
Furtherly, for the graded index multimode fiber by drawing cone processing, tapered zone end passes through coreless fiber
It is connect with one end of single mode optical fiber.
Furtherly, pumping input optical fibre to the optical fiber between single mode optical fiber is fixed on aluminum strip.
The utility model has the function of while monitoring output power and stimulated Brillouin scattering threshold value, is not necessarily to water cooling, valence
The advantages that lattice are cheap, compact-sized.
Description of the drawings
Fig. 1 is the structural schematic diagram of the utility model.
Specific implementation mode
The utility model is used connects one section or two sections between the pumping input optical fibre and single mode optical fiber of pump combiner
Graded index multimode fiber（graded index fiber, GIF）Improve coupling effect of the light from multimode fibre to single mode optical fiber
Rate.In order to further increase coupling efficiency, can also carry out drawing cone to graded index fiber or using one section of GIF optical fiber and
One section of coreless fiber modeling combination.The pump light that reverse transfer is filtered out using the fibre optic isolater for working in signal in band keeps base
Mould signal light.By the fiber-optical probe incoming fiber optic isolator output end with tail optical fiber, optical signal is changed into electric signal, passes through signal
Processing circuit is monitored output power.When the signal monitored be more than setting value and in nonlinear change when explanation be excited cloth
In deep pool scattering will excite, send out alarm signal, and accordingly send out control signal reduce main amplifier pumping source power supply electricity
Stream is directly cut off；When the signal monitored be less than setting value when by controller adjust main amplifier pumping source and
Prime input signal light size is to keep output power constant.
Embodiment：
As shown in Figure 1, by taking the high-capacity optical fiber laser of MOPA structures as an example, the program is equally applicable to more stages and puts in advance
The fiber ring laser system of big structure.Realize that real time on-line monitoring high-capacity optical fiber laser output power and excited Brillouin dissipate
The device for penetrating threshold value include the input pumping light fibre 1 of a pump combiner, graded index multimode fiber 2, coreless fiber 3,
One section of single covering single mode optical fiber, 4, single mode optical fiber isolators, 5, one band tail optical fiber photodetector 6 and signal control processing circuit
7。
It is L1 by a length in the pumping input optical fibre welding of pump combiner（2cm or so）Graded-index multimode light
Fine GIF1 can carry out GIF1 appropriate draw and bore in order to better improve through pumping the light of input optical fibre reverse transfer；GIF1 light
Fine tapered zone end and a length are L2（2cm or so）The connected carry out pattern modeling operation of coreless fiber, can also be according to practical coupling
Efficiency is closed to substitute the other GIF2 optical fiber of coreless fiber；Coreless fiber or GIF2 optical fiber are connected with single mode optical fiber, by high-order
The light of pattern is rejected；Single mode optical fiber output end is connected with the input terminal of fibre optic isolater again, contains in backlight for filtering out
Basic mode pump light, to the ingredient only signal light and stokes light containing reverse transfer of residual light；Fibre optic isolater it is defeated
Outlet is connected with the photodetector with tail optical fiber again, and optical signal is changed into electric signal；Last photodetector is controlled with signal again
Processing circuit is connected, and monitors that the variation relation of signal controls prime seed light and pumping source by comparing.Such as
Illustrate that stimulated Brillouin scattering will excite when the signal monitored is more than setting value and is in nonlinear change, at signal control
Reason circuit will send out alarm signal, and accordingly send out the pumping source supply current or direct of control signal reduction main amplifier
Cut-out；When the signal monitored is less than setting value, the pumping source and prime of main amplifier are adjusted by signal controller
Input signal light size is to keep output power constant.
It, can will be from pumping input light in addition to preferably ensure the fibre junction point in coupling effect and protective device
Fine and GIF1 fusion points start to stretch and fix to the optical fiber between coreless fiber or GIF2 optical fiber and the fusion point of single mode optical fiber
On the aluminum strip that a size is long 100mm, width 15mm.
Claims (4)
1. a kind of high-capacity optical fiber laser power and SBS threshold on-Line Monitor Device, including graded index multimode fiber, list
Mode fiber, fibre optic isolater, photodetector and signal control processing circuit, which is characterized in that the pumping of pump combiner is defeated
Enter optical fiber to connect with graded index multimode fiber one end, the one of the other end connection single mode optical fiber of graded index multimode fiber
End, the other end of single mode optical fiber and the input terminal of fibre optic isolater connect, the output end of fibre optic isolater and the photoelectricity with tail optical fiber
Detector input terminal is connected, photodetector output end connection signal control process circuit, and the signal control processing circuit is logical
It crosses comparison and monitors that the variation relation of signal controls prime input signal light and pumping source.
2. high-capacity optical fiber laser power according to claim 1 and SBS threshold on-Line Monitor Device, feature exist
In：The graded index multimode fiber has two sections.
3. high-capacity optical fiber laser power according to claim 1 and SBS threshold on-Line Monitor Device, feature exist
In：The graded index multimode fiber by drawing cone processing, tapered zone end pass through coreless fiber and single mode optical fiber one
End connection.
4. high-capacity optical fiber laser power according to claim 1 or 2 or 3 and SBS threshold on-Line Monitor Device, special
Sign is：Pumping input optical fibre to the optical fiber between single mode optical fiber is fixed on aluminum strip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820369242.1U CN207964098U (en) | 2018-03-19 | 2018-03-19 | A kind of high-capacity optical fiber laser power and SBS threshold on-Line Monitor Device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820369242.1U CN207964098U (en) | 2018-03-19 | 2018-03-19 | A kind of high-capacity optical fiber laser power and SBS threshold on-Line Monitor Device |
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| CN207964098U true CN207964098U (en) | 2018-10-12 |
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Cited By (2)
| 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 |
| 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 |
-
2018
- 2018-03-19 CN CN201820369242.1U patent/CN207964098U/en active Active
Cited By (2)
| 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 |
| 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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