CN107069397A - A kind of resonator super continuum source output device - Google Patents
A kind of resonator super continuum source output device Download PDFInfo
- Publication number
- CN107069397A CN107069397A CN201710023185.1A CN201710023185A CN107069397A CN 107069397 A CN107069397 A CN 107069397A CN 201710023185 A CN201710023185 A CN 201710023185A CN 107069397 A CN107069397 A CN 107069397A
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- Prior art keywords
- fiber
- optical
- acousto
- super continuum
- continuum source
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
Abstract
The present invention provides a kind of resonator super continuum source output device, including optical resonator and the Yb dosed optical fiber being sequentially connected, laser, acousto-optic modulator and the tapered fiber positioned at the optical resonance intracavitary;The optical resonator, for controlling light beam intracavitary concussion function and exporting super continuum source;The Yb dosed optical fiber, is used as the gain media of the super continuum source;The laser, is used as the pumping source of the super continuum source;The acousto-optic modulator, the laser pulse for exporting specific frequency;The tapered fiber, for strengthening the nonlinear effect of the super continuum source and the energy in shortwave direction.Device of the present invention simplifies the structure of existing super continuum source output device, and spectrum widening is realized in the case of pump power is relatively low, reduces cost, and light phototranstormation efficiency is high.
Description
Technical field
The present invention relates to optical fiber laser field, more particularly, to a kind of resonator super continuum source output device.
Background technology
Super continuum source of the present invention is a kind of pulsed laser light source, with wider relative to tunable laser
Spectral region.When strong light is transmitted in nonlinear dielectric, by Self-phase modulation (SPM), Cross-phase Modulation (XPM), four
The nonlinear effects such as wave mixing (FWM), stimulated Raman scattering (SRS), dispersive wave frequency displacement, soliton self-frequency sh and effect of dispersion are total to
Same-action so that the very big broadening of spectrum, and super continuum source is produced, its super continuum source spectral region can cover ultraviolet arrive
Near infrared region.
The characteristics of there is spectral width, spatial coherence due to super continuous spectrums, in material analysis, optical coherence tomography, optical fiber
There is important application in terms of communication and photoelectronic warfare.
At present, the output device of super continuum source mainly uses the outer pump photon crystal of light pulse chamber in the prior art
Optical fiber is so as to produce super continuum source, and its super continuous spectrums good beam quality produced, spectral region is wide, and flatness is good;But
Big with ordinary optic fibre splice loss, splice attenuation, the intensity of required light pulse is larger, and fiber lengths are longer, and cost is higher.
The content of the invention
The present invention provides a kind of resonator super continuous spectrums for overcoming above mentioned problem or solving the above problems at least in part
Light source output device.
There is provided a kind of resonator super continuum source output device, including optical resonance according to an aspect of the present invention
Chamber, Yb dosed optical fiber, laser, acousto-optic modulator and tapered fiber;
The optical resonator, for controlling light beam intracavitary concussion function and exporting super continuum source;
The Yb dosed optical fiber, is used as the gain media of the super continuum source;
The laser, is used as the pumping source of the super continuum source;
The acousto-optic modulator, the laser pulse for exporting specific frequency;
The tapered fiber, for strengthening the nonlinear effect of the super continuum source and the energy in shortwave direction;
The acousto-optic modulator, Yb dosed optical fiber, laser and tapered fiber are sequentially connected, and positioned at the optical resonator
It is interior;The acousto-optic modulator and the tapered fiber are also connected with the optical resonator respectively.
Further, the tapered fiber includes a drawing cone region;Or
Multiple draw bores region, each to draw cone region mutually to cascade, and there is drawing that is identical or differing to bore in each drawing cone region
Parameter.
Further, the tapered fiber is any one in multimode fibre, single-mode fiber and photonic crystal fiber.
Further, the tapered fiber be formed after fused biconical taper processing is carried out under cone condition is drawn in thermal insulation with one or
It is multiple to draw the optical fiber for boring region, and each two ends for drawing cone region have symmetrically cone plot structure.
Further, the optical resonator includes the first fiber grating and the second fiber grating, first fiber grating
It is connected with the acousto-optic modulator, second fiber grating is connected with the tapered fiber;Second fiber grating
For exporting the super continuum source.
Further, one end of second fiber grating connects the tapered fiber, and the other end is connected with output optical fibre;
The output optical fibre passes through chamfering process, for receiving the super continuum source of the second fiber grating output simultaneously
Externally output.
Further, the acousto-optic modulator is also connected with signal generator;
The signal generator, for setting optical signal parameters, so that acousto-optic modulator output specific frequency is sharp
Light pulse;
Further, the laser includes the semiconductor laser and optical-fiber bundling device being connected with each other;
One end connection Yb dosed optical fiber of the optical-fiber bundling device, other end connection tapered fiber;
The semiconductor laser, for the pumping source as the super continuum source, passes through the optical-fiber bundling device
Laser coupled is entered into the optical resonator, the adjustable Q laser pulse signal of frequency identical with the specific frequency is exported.
Further, the scope of the specific frequency is several hertz to several megahertzs.
Further, the acousto-optic modulator is also connected with acoustooptic modulator driver and driving power supply, the acousto-optic modulator
Driver is used to select driving power supply parameter according to the specification of the acousto-optic modulator, and the driving power supply is used for acousto-optic modulation
Device driving power supply.
The application proposes a kind of resonator super continuum source output device based on tapered fiber, passes through the first optical fiber light
Grid and the second fiber grating formation optical resonator, the pulse signal exported by the nonlinear effect of tapered fiber to laser
Enter line broadening, super continuum source is directly exported by the optical resonator, simplify existing super continuum source output dress
The structure put, realizes spectrum widening in the case of pump power is relatively low, and spatial coherence is good, reduces cost, and light-light conversion
Efficiency high.
Brief description of the drawings
Fig. 1 is a kind of resonator super continuum source output device schematic diagram of the present invention;
Fig. 2 is tapered fiber schematic diagram of the present invention.
Description of reference numerals
1st, the first fiber grating, 2, acousto-optic modulator, 3, signal generator, 4, Yb dosed optical fiber, 5, optical-fiber bundling device, 6, half
Conductor laser, 7, tapered fiber, the 8, second fiber grating, 9, output optical fibre.
Embodiment
With reference to the accompanying drawings and examples, the embodiment to the present invention is described in further detail.Implement below
Example is used to illustrate the present invention, but is not limited to the scope of the present invention.
As shown in figure 1, for a kind of resonator super continuum source output device of the invention, all may be used comprising this specification
Embodiment is selected, is specifically included:
The first fiber grating 1 for being sequentially connected, acousto-optic modulator 2, Yb dosed optical fiber 4, optical-fiber bundling device 5, tapered fiber 7,
Second fiber grating 8 and output optical fibre 9, the acousto-optic modulator 2 are also connected with signal generator 3, and the optical-fiber bundling device 5 also connects
Connect semiconductor laser 6.
The present embodiment described device is by a pair of high reflectance fiber gratings, acousto-optic modulator, signal generator, doping light
Fibre, optical-fiber bundling device, semiconductor laser and tapered fiber composition.Wherein, fiber grating pair formation resonator;Semiconductor laser
Device makees pumping source;Doped fiber makees gain operation material;Tapered fiber has high nonlinear coefficient, is to be used to produce super continuous spectrums
Nonlinear dielectric;The super continuum source of generation is exported by output optical fibre.
A kind of resonator super continuous spectrums light based on tapered fiber provided as a more brief embodiment, the present invention
Source output device includes optical resonator, Yb dosed optical fiber, laser, acousto-optic modulator and tapered fiber;
The optical resonator, for controlling light beam intracavitary concussion function and exporting super continuum source;
The Yb dosed optical fiber, for the gain media as the super continuum source;
The laser, for the pumping source as the super continuum source;
The acousto-optic modulator, the laser pulse for exporting specific frequency;
The tapered fiber, for strengthening the nonlinear effect of the super continuum source and the energy in shortwave direction;
The acousto-optic modulator, Yb dosed optical fiber, laser and tapered fiber are sequentially connected, and positioned at the optical resonator
It is interior;The acousto-optic modulator and the tapered fiber are also connected with the optical resonator respectively.
The present invention can obtain good non-thread by the use of tapered fiber as the nonlinear dielectric of the super continuum source
Property effect, and the energy in the shortwave direction of the super continuum source can be strengthened.
Ordinary optic fibre changes fibre-optical dispersion spy by drawing cone to obtain high nonlinear coefficient, and through drawing cone to handle
Property, reduce zero-dispersion wavelength of fiber, it is easier to strengthen the energy in super continuous spectrums shortwave direction.Laser is obtained in the case where cone condition is drawn in thermal insulation
To tapered fiber in transmit when be lost small, and optical fiber two ends are small without other fiber optic splicing loss in processing, with laser,
Improve the light-light conversion efficiency of super continuum source.
When photonic crystal fiber draw cone processing, not only make photonic crystal fiber that there is stronger nonlinear effect, together
When change photonic crystal fiber zero-dispersion wavelength, make shortwave oriented energy stronger.And super continuous spectrums are directly exported by resonator
The structure of super continuum source can be simplified, as laser shakes in intracavitary so that can be real in the case of pump power is relatively low
Existing spectrum widening.
The Yb dosed optical fiber can choose appropriate doping concentration and fiber lengths as gain operation material, to improve light-light
Conversion efficiency.According to experiment effect, when doping concentration is 3.9dB/m, and fiber lengths are 4m, can be achieved optimal spectrum broadening with
And light-light conversion efficiency.
Based on another optional embodiment of the more brief embodiment, the tapered fiber includes a Ge Lazhui areas
Domain;Or
Multiple draw bores region, each to draw cone region mutually to cascade, and there is drawing that is identical or differing to bore in each drawing cone region
Parameter.
Tapered fiber of the present invention can draw cone region comprising one, can also draw cone region comprising multiple.When described
When tapered fiber includes multiple drawing cone regions, each draws cone region mutually to cascade, and each drawing is bored region and can had
Identical draws cone parameter, it is possible to have difference draws cone parameter.
Based on another optional embodiment of the more brief embodiment, the tapered fiber is multimode fibre, list
Any one in mode fiber and photonic crystal fiber.
As it was previously stated, the ordinary optic fibre by the use of multimode fibre or single-mode fiber is handled as nonlinear dielectric by drawing to bore,
Manufacturing process is very simple, and tapered fiber two ends are unprocessed, is matched with resonator inner fiber, and adiabatic draw is met when drawing cone process
During cone condition, laser transmission loss in tapered fiber is smaller, therefore the super continuum source based on tapered fiber is with higher
Light-light conversion efficiency.
And draw cone photonic crystal fiber to have bigger by drawing cone processing as nonlinear dielectric by the use of photonic crystal fiber
Nonlinear factor, is that super continuous spectrums output can be achieved compared with short fiber, and in the case where meeting adiabatic drawing cone condition, light is transmitted in a fiber
Loss is smaller.
Based on another optional embodiment of the more brief embodiment, the tapered fiber is to draw pricker bar in thermal insulation
Carry out forming the optical fiber with one or more drawing cone regions after fused biconical taper processing under part, and each two ends for drawing cone region have
There is symmetrical cone plot structure, as shown in Figure 2.The symmetrical cone plot structure can reduce laser in tapered fiber transmission loss.
The tapered fiber is relative to drawing with thinner diameter before cone, and cladding diameter is 125 μm of optical fiber, can draw cone
To a diameter of 10 μm.In actual use, to avoid damage, the shell with fixture can be made and heat abstractor is designed,
Tapered fiber is placed in the housing;And high folding glue is applied in the appropriate location of the tapered fiber, unnecessary cladding light is divested,
The tapered fiber is prevented to be burned out.
Based on another optional embodiment of the more brief embodiment, the optical resonator includes the first optical fiber
Grating and the second fiber grating, first fiber grating are connected with the acousto-optic modulator, second fiber grating with
The tapered fiber is connected;Second fiber grating is used to export the super continuum source.
First fiber grating and the second fiber grating constitute optical resonator, and first fiber grating and second
Fiber grating has high reflectance;Laser realizes spectrum widening in optical resonance intracavitary concussion.The optical resonance intracavitary
Optical fiber can be built by single-mode fiber or multimode fibre.
One end of second fiber grating connects the tapered fiber, and the other end is connected with output optical fibre;
The output optical fibre passes through chamfering process, for receiving the super continuum source of the second fiber grating output simultaneously
Externally output.
Second fiber grating only has reflex to wavelength 1064nm light, therefore super continuous spectrums laser can be by described
Second fiber grating is exported.
In order to avoid Fresnel reflection, prevent output end from damaging output optical fibre weldable output end and emitting or take at beveling
Reason.
Based on another optional embodiment of the more brief embodiment, the acousto-optic modulator is also connected with signal hair
Raw device;
The signal generator, for setting optical signal parameters, so that acousto-optic modulator output specific frequency is sharp
Light pulse.
The laser includes the semiconductor laser and optical-fiber bundling device being connected with each other;
One end connection Yb dosed optical fiber of the optical-fiber bundling device, other end connection tapered fiber;
The semiconductor laser, for the pumping source as the super continuum source, passes through the optical-fiber bundling device
Laser coupled is entered into the optical resonator, the adjustable Q laser pulse signal of frequency identical with the specific frequency is exported.
The scope of the specific frequency is several hertz to several megahertzs.The adjustable Q laser pulse signal, which passes through, has Gao Fei
The tapered fiber of linear coefficient, produces nonlinear effect, spectrum widening formation super continuum source.
The acousto-optic modulator is also connected with acoustooptic modulator driver and driving power supply, and the acoustooptic modulator driver is used
In selecting driving power supply parameter according to the specification of the acousto-optic modulator, the driving power supply, which is used to drive to acousto-optic modulator, to be supplied
Electricity.In use it should be noted that acousto-optic modulator damaging thresholding, it is to avoid damage the acousto-optic modulator beyond threshold value.
The present invention is using tapered fiber as nonlinear optical fiber, and pulling process is simple, reduces optical fiber usage amount, saves into
This;Directly nonlinear optical fiber is accessed in resonator, it is not necessary to simple in construction using the outer pumping form of amplifying stage or chamber, can be with
Export high-output power, wide spectral range, the super continuous spectrums that flatness is good and spatial coherence is good.
Finally, the present processes are only preferably embodiment, are not intended to limit the scope of the present invention.It is all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements made etc. should be included in the protection of the present invention
Within the scope of.
Claims (10)
1. a kind of resonator super continuum source output device, it is characterised in that including optical resonator, Yb dosed optical fiber, laser
Device, acousto-optic modulator and tapered fiber;
The optical resonator, for controlling light beam intracavitary concussion function and exporting super continuum source;
The Yb dosed optical fiber, is used as the gain media of the super continuum source;
The laser, is used as the pumping source of the super continuum source;
The acousto-optic modulator, the laser pulse for exporting specific frequency;
The tapered fiber, for strengthening the nonlinear effect of the super continuum source and the energy in shortwave direction;
The acousto-optic modulator, Yb dosed optical fiber, laser and tapered fiber are sequentially connected, and positioned at the optical resonance intracavitary;
The acousto-optic modulator and the tapered fiber are also connected with the optical resonator respectively.
2. device as claimed in claim 1, it is characterised in that the tapered fiber includes one and draws cone region;Or
Multiple draw bores region, each to draw cone region mutually to cascade, and each drawing cone region has drawing cone parameter that is identical or differing.
3. device as claimed in claim 1, it is characterised in that the tapered fiber is multimode fibre, single-mode fiber and photon
Any one in crystal optical fibre.
4. device as claimed in claim 1, it is characterised in that the tapered fiber is to be melted in the case where cone condition is drawn in thermal insulation
Draw and the optical fiber with one or more drawing cone regions is formed after cone processing, and each two ends for drawing cone region are with symmetrical cone area
Structure.
5. device as claimed in claim 1, it is characterised in that the optical resonator includes the first fiber grating and the second light
Fine grating, first fiber grating is connected with the acousto-optic modulator, second fiber grating and the tapered fiber
It is connected;Second fiber grating is used to export the super continuum source.
6. device as claimed in claim 5, it is characterised in that one end connection of second fiber grating is described to draw cone light
Fibre, the other end is connected with output optical fibre;
The output optical fibre passes through chamfering process, for receiving the super continuum source of second fiber grating output and external
Output.
7. device as claimed in claim 1, it is characterised in that the acousto-optic modulator is also connected with signal generator;
The signal generator, for setting optical signal parameters, so that the acousto-optic modulator exports the laser arteries and veins of specific frequency
Punching.
8. device as claimed in claim 7, it is characterised in that the laser include the semiconductor laser being connected with each other and
Optical-fiber bundling device;
One end connection Yb dosed optical fiber of the optical-fiber bundling device, other end connection tapered fiber;
The semiconductor laser, for the pumping source as the super continuum source, will be swashed by the optical-fiber bundling device
Optical coupling enters the optical resonator, exports the adjustable Q laser pulse signal of frequency identical with the specific frequency.
9. device as claimed in claim 7, it is characterised in that the scope of the specific frequency is several hertz to several megahertzs.
10. device as claimed in claim 7, it is characterised in that the acousto-optic modulator is also connected with acoustooptic modulator driver
And driving power supply, the acoustooptic modulator driver be used for according to the specification of the acousto-optic modulator select driving power supply parameter,
The driving power supply, which is used to drive to acousto-optic modulator, powers.
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Cited By (2)
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CN108512020A (en) * | 2017-09-22 | 2018-09-07 | 中国人民解放军国防科技大学 | Incoherent super-continuum spectrum light source with controllable spectrum and tunable output power |
CN111751802A (en) * | 2020-07-27 | 2020-10-09 | 北京工业大学 | Photon-level self-adaptive high-sensitivity space weak target detection system and detection method |
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