CN206558873U - A kind of ultra wide band random fiber laser based on multi wavelength pumping - Google Patents
A kind of ultra wide band random fiber laser based on multi wavelength pumping Download PDFInfo
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- CN206558873U CN206558873U CN201720074248.1U CN201720074248U CN206558873U CN 206558873 U CN206558873 U CN 206558873U CN 201720074248 U CN201720074248 U CN 201720074248U CN 206558873 U CN206558873 U CN 206558873U
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Abstract
The utility model is related to a kind of general random fiber laser of the ultra-wide based on multi wavelength pumping.Including multi wavelength pumping source, ultra wide band coupler and passive optical fiber.Multi wavelength pumping source can be conventional optical fiber laser, can also be the semiconductor laser or solid state laser of fiber coupling, single wavelength laser linewidth is between 1nm to 5nm, the quantity of wavelength is determined according to the actual requirements, wavelength interval is between 5nm to 15nm, and each single wavelength laser is produced by the way of being cascaded using wavelength division multiplexer or directly.According to the mode directly cascaded, waterfall sequence is long wavelength laser preceding, and short wavelength laser is rear.Ultra wide band coupler can guarantee that the signal pumping of pumping wavelength and generation is all low-loss and pass through.The utility model can produce wider spectrum width, the random optical-fiber laser of more power compared with existing random fiber laser.
Description
Technical field
The invention belongs to Fiber laser technology field, and in particular to a kind of random optical fiber of ultra wide band based on multi wavelength pumping
Laser.
Background technology
Random fiber laser utilizes Rayleigh scattering faint in passive optical fiber to provide accidental distributed feedback, and its gain comes
The nonlinear effect of stimulated Raman scattering (SRS) in passive optical fiber is come from, therefore " resonance free chamber ", " no gain light can be realized
Laser output under the conditions of fibre ".The random fiber laser of early stage does not need any feedback devices such as grating, therefore is referred to as
" standard-sized sheet chamber " structure random fiber laser.In recent years, researcher is proposed by introducing high reflective grid in one end of laser,
" partly begin to speak " structure, theoretical and experimental study shows, " partly beginning to speak " structure can reduce out photo threshold, improving laser device effect
Rate, and the Random Laser of transmitted in both directions in " standard-sized sheet chamber " structure originally is exported from single-end optical fiber, advantageously should in reality
With.Due to providing random feedback using the Rayleigh scattering in Disordered Media, it is not necessary to which strict cavity resonator structure, random optical fiber swashs
Light utensil have it is simple in construction, without longitudinal mode, high conversion efficiency, smooth spectrum the features such as, be the study hotspot of laser technology field.
The random optical-fiber laser research of early stage is main in face of fields, the generally output light to Random Laser such as communication, sensings
Spectral width does not have particular/special requirement, but for illuminating, being shown as the fields such as picture, photoelectronic warfare, it is desirable to obtain as wide as possible defeated
Go out spectrum, but the 3dB spectrum widths of general random laser output are both less than 5nm, it is impossible to meet actual demand.On the other hand, at present
Using some filtering devices can realize relatively wide wave-length coverage Random Laser output, but be all used it is complex
Filtering device, output wavelength is discrete form, and these devices can not bear high power, therefore power output is relatively low,
Limit practical application.
The gain of random fiber laser derives from SRS effects in passive optical fiber, in silicon glass fiber, and Random Laser increases
Generally there is fixed frequency interval in beneficial spike length, i.e. 13.2THz with pumping wavelength, therefore in silicon glass fiber, with
The output wavelength of machine optical-fiber laser is relative to be determined.Because real upper laser level, the increasing of its centre wavelength is not present in SRS processes
Benefit can not be similar to the laser that rare-earth ion-doped gain is converted into other wavelength by the transmission of other energy levels, therefore, laser light
The broadening of spectrum places one's entire reliance upon the effect of nonlinear effect and dispersion.But if strengthen the strong of nonlinear effect merely
Degree, will necessarily reduce the threshold value of second order Random Laser generation, so as to limit the lifting of single order Random Laser power again.
The content of the invention
The purpose of the present invention is to propose to the ultra-wide spectrum optical fibre laser implementation of base multi wavelength pumping, with break through in the past with
The narrower limitation of output spectrum in machine optical fiber laser, further widens the output spectrum width of random fiber laser.It thinks substantially
Think be：Light source pumping random fiber laser based on multiple certain wavelength intervals, is tied simultaneously using the spectral characteristic of pumping source
The spectrum widening of Random Laser itself is closed, the Random Laser output of continuous ultra wide band is produced.Its constitute substantially including：Multiple wavelength pump
Pu source, passive optical fiber and ultra wide band coupler, the wherein output end of multi wavelength pumping source (1) and ultra wide band coupler (2)
One end is connected by the way of welding, and the common port and passive optical fiber (3) of ultra wide band coupler (2) are by the way of welding
Connected；The other end sharping of passive optical fiber (3) is exported with suppressing this facet feedback as the forward direction of Random Laser
End；The other end sharping of ultra wide band coupler (2), is used as the backward output end of random fiber laser.
Now to each part the characteristics of, is described as follows：
Multi wavelength pumping source：Can be conventional optical fiber laser or fiber coupling semiconductor laser or
Person's solid state laser.Laser is exported by fiber coupling, the diameter one of the diameter of fiber core and passive fiber core described hereinafter
Cause, the numerical aperture of fiber core is consistent with the numerical aperture of passive fiber core described hereinafter, cardiac wave during laser is specific
Length is single wavelength laser without particular requirement, laser, and line width is taken between 1nm to 5nm, and the quantity of laser is according to actual need
Ask determination, wavelength interval is taken between 5nm to 15nm, polarization characteristic does not have particular/special requirement；
Above-mentioned laser is produced by the way of being cascaded using wavelength division multiplexer or directly, according to the mode directly cascaded,
Waterfall sequence is long wavelength laser preceding, and short wavelength laser is rear；
Passive optical fiber：Conventional silica-based optical fiber or photonic crystal fiber, is made up of fibre core, covering and coat.Pump
Pu light and the laser produced are transmitted in fibre core, by Theoretical Design make passive optical fiber have larger nonlinear factor and compared with
Small dispersion；
Ultra wide band coupler：There is higher transmitance in pump-wavelength range and the spectral region intentionally got, can protect
The signal pumping of card laser wavelength and generation is all low-loss to be passed through, it should be pointed out that the fiber coupling of current ultra wide band
Device is based primarily upon Space Coupling, lens reflecting structure, and the coating technique for 100nm or so width is very ripe.
The present invention proposes a kind of ultra-wide spectrum random fiber laser of multi wavelength pumping.Compared with conventional art, the present invention
The narrower limitation of Random Laser output spectrum is breached, wider spectrum width, more power output can be achieved, with advanced and practical
Property.
Brief description of the drawings
Fig. 1 is the structural representation of the ultra wide band random fiber laser of the invention based on multi wavelength pumping,
Fig. 2 is the structural representation of one of the producing method in multi wavelength pumping source of the present invention,
Fig. 3 is two structural representation of the producing method in multi wavelength pumping source of the present invention.
Embodiment
The present invention is further described with reference to diagram：
Ultra wide band random fiber laser shown in Fig. 1 include multi wavelength pumping source (1), ultra wide band coupler (2) and by
3 parts such as dynamic optical fiber (3).Wherein one end of the output end of pumping source (1) and ultra wide band coupler (2) is by the way of welding
Connected, fusion point is (4), and common port and the passive optical fiber (3) of ultra wide band coupler (2) are connected by the way of welding
Connect, fusion point is (5)；The other end sharping (7) of passive optical fiber (3) to suppress facet feedback, and as Random Laser before
To output end.Another free end sharping (6) of ultra wide band coupler (2), is used as the backward output end of random fiber laser.
The one of which that Fig. 2 show multi wavelength pumping source (1) produces structure.Single wavelength optical fiber laser (81),
(82) ..., (8N) is connected by each input arm of wavelength division multiplexer (9), is connected by the way of welding, fusing point is respectively
(41), (42) ..., (4N), finally exported from the common port of wavelength division multiplexer (9).Single wavelength optical fiber laser (81),
(82) ..., the wavelength interval of (8N) is between 5nm to 15nm, and each laser bandwidth is between 1nm to 5nm.
Fig. 3 show another generation structure in multi wavelength pumping source (1).Single wavelength optical fiber laser (81),
(82) ..., (8N) is connected by way of cascading welding, fusing point be respectively (51), (52) ..., (5N), the order of connection
It is long wavelength laser preceding, short wavelength laser is rear.Between single wavelength optical fiber laser (81), (82) ..., the wavelength of (8N)
It is interposed between 5nm to 15nm, each laser bandwidth is between 1nm to 5nm.
The corresponding specific embodiment of schematic structural view of the invention is given below：
For the ultra-wide spectrum random fiber laser shown in Fig. 1, multi wavelength pumping source (1) be wavelength be respectively 1070nm,
1080nm, 1090nm, 1100nm ytterbium-doping optical fiber laser, are exported, single laser is defeated all the way using the structure synthesis shown in Fig. 2
It is 10 watts to go out power, and 3dB line widths are 3nm.Multi wavelength pumping source (1) synthesized using mode shown in Fig. 2 after with ultra wide band coupling
Clutch (2) welding.Ultra wide band coupler common port and core diameter are 10 μm, numerical aperture is quilt that 0.06, length is 800m
One end welding of dynamic optical fiber (3), the other end sharping (7) of passive optical fiber (3) is used as output end.By faint in passive optical fiber
The accidental distributed feedback that provides of Rayleigh scattering and the gain that provides of stimulated Raman scattering, 1120nm to 1160nm can be achieved
Ultra wide band single order Raman light output；Because spectrum widening is acted on caused by nonlinear effect in multi wavelength pumping source (1) and optical fiber,
There can be Random Laser generation in 1120nm to 1160nm wide spectral range, this is the most wide spectrum that the current wave band is produced
The Random Laser of scope.
Claims (2)
1. a kind of ultra wide band random fiber laser based on multi wavelength pumping, including multi wavelength pumping source（1）, ultra wide band coupling
Device（2）With passive optical fiber（3）, the multi wavelength pumping source（1）It is conventional optical fiber laser, or fiber coupling is partly led
Body laser or solid state laser, using the spectrum widening of the spectral characteristic combination Random Laser itself of pumping source, the company of generation
The Random Laser output of continuous ultra wide band, it is characterised in that：
Multi wavelength pumping source（1）Output end and ultra wide band coupler（2）One end connected by the way of welding, ultra-wide
Band coupler（2）Common port and passive optical fiber（3）Connected by the way of welding；Passive optical fiber（3）The other end cut
Oblique angle is used as the forward direction output end of Random Laser to suppress this facet feedback；Ultra wide band coupler（2）The other end cut tiltedly
Angle, is used as the backward output end of random fiber laser；
The laser be single wavelength laser, line width between 1nm to 5nm, laser wavelength be spaced in 5nm to 15nm it
Between,
The laser is produced by the way of being cascaded using wavelength division multiplexer or directly, according to the mode directly cascaded, cascade
Order is long wavelength laser preceding, and short wavelength laser is rear.
2. a kind of ultra wide band random fiber laser based on multi wavelength pumping according to claim 1, the passive light
It is fine（3）For traditional quartz glass optical fiber or photonic crystal fiber.
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| CN201720074248.1U CN206558873U (en) | 2017-01-19 | 2017-01-19 | A kind of ultra wide band random fiber laser based on multi wavelength pumping |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602395A (en) * | 2017-01-19 | 2017-04-26 | 中国人民解放军国防科学技术大学 | Ultra-wideband random fiber laser based on multi-wavelength pumping |
| CN111864519A (en) * | 2020-05-28 | 2020-10-30 | 中国人民解放军国防科技大学 | Dual-wavelength pumping all-fiber 4.3 mu m waveband carbon dioxide laser |
-
2017
- 2017-01-19 CN CN201720074248.1U patent/CN206558873U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602395A (en) * | 2017-01-19 | 2017-04-26 | 中国人民解放军国防科学技术大学 | Ultra-wideband random fiber laser based on multi-wavelength pumping |
| CN111864519A (en) * | 2020-05-28 | 2020-10-30 | 中国人民解放军国防科技大学 | Dual-wavelength pumping all-fiber 4.3 mu m waveband carbon dioxide laser |
| CN111864519B (en) * | 2020-05-28 | 2022-02-08 | 中国人民解放军国防科技大学 | Dual-wavelength pumping all-fiber 4.3 mu m waveband carbon dioxide laser |
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