CN103825164A - High average power full optical fiber intermediate infrared supercontinuum light source - Google Patents
High average power full optical fiber intermediate infrared supercontinuum light source Download PDFInfo
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- CN103825164A CN103825164A CN201310643216.5A CN201310643216A CN103825164A CN 103825164 A CN103825164 A CN 103825164A CN 201310643216 A CN201310643216 A CN 201310643216A CN 103825164 A CN103825164 A CN 103825164A
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Abstract
The invention discloses a high average power full optical fiber intermediate infrared supercontinuum light source. The light source comprises a pulse pumping source with an output pigtail, a single mode passive optical fiber, at least one level of thulium doped optical fiber amplifier, a second optical fiber combiner and an er-doped fluoride optical fiber, wherein the pulse pumping source with the output pigtail, the single mode passive optical fiber, at least one level of thulium doped optical fiber amplifier, the second optical fiber combiner and the er-doped fluoride optical fiber are successively connected along a light path. A second pumping source and the second input end of the second optical fiber combiner are connected. According to the invention, a high power laser diode is used to carry out pumping on the er-doped fluoride optical fiber, thus a spectrum is broadened in the optical fiber due to a nonlinear effect and is strengthened due to high gain produced by pumping near 2.7 microns; the nonlinear effect in an intermediate infrared wave band is further stimulated, thus a eventually acquired supercontinuum has a wide wavelength coverage area and high average power; due to the adoption of a full optical fiber structure, integration and commercialization can be easily carried out; and the light source has a wide application prospect in frequency measurement, wavelength division multiplexing and other fields.
Description
Technical field
The present invention relates to laser optoelectronic technical field, particularly infrared super continuum source in the full optical fiber of a kind of high-average power.
Background technology
Super continuous spectrums is because its application prospect in fields such as frequency measurement, wavelength division multiplexing and optical coherence tomographies becomes study hotspot in recent years.In various super continuous spectrums generation devices, optical fiber super continuum source is especially noticeable, and this is mainly because the super continuum source of all optical fibre structure is subject to the impact of external environment little and be easy to integratedly, is conveniently converted into commercial equipment.
At present existing optical fiber super continuum source is mainly divided into two classes: a class is to extend to near-infrared from ultraviolet, and another kind of is infrared from near-infrared extends to.The former utilizes the quartz glass photonic crystal light of particular design to realize the broadening of spectrum, and latter is to export super continuous spectrums by fluoride glass optical fiber, chalcogenide glass optical fiber etc.The root of the difference of the two is that the high loss of quartz glass optical fiber more than 2.2 microns makes the super continuous spectrums producing by the former be difficult to extend to middle-infrared band.The pumping source of super continuous spectrums is varied, has all realized that spectrum is hundreds of, the broadening of thousands of nanometers from output continuous light to the pumping source of output nanosecond, psec, femtosecond pulse.This wherein adopts the nanosecond optical pumping of continuous light or high repetition frequency to be easy to obtain the super continuous spectrums of high-average power, and nanosecond pump light because its advantage in peak power is more adopted.
At present the method for common acquisition high-average power super continuous spectrums is: first with nanosecond, kilowatt, wavelength be 1.55 microns near one section of single mode passive fiber of pulse pump, generation wave-length coverage is generally the super continuous spectrums of 1.5 microns to 2.2 microns.Then utilize thulium doped fiber amplifier to carry out multistage amplification to it, near the high power super continuous spectrums producing two microns.Finally with its come one section of pumping in the optical fiber of the type such as fluoride glass, chalcogenide glass of infrared " transparent ", to produce infrared excess continuous spectrum in high-average power.This technical scheme can produce average power and reach tens of watts, and wavelength exceedes the super continuous spectrums of 4 microns, but the character of final stage optical fiber has limited the further raising of conversion efficiency, average power and the spectrum widening scope of super continuous spectrums.
Summary of the invention
For obtaining the more superior middle infrared excess continuous spectrum of performance, the present invention improves said method, infrared super continuum source in the full optical fiber of a kind of high-average power has been proposed, light during by this section of optical fiber not only because nonlinear effect spectrum obtains broadening, the spectral component of corresponding wave band is exaggerated simultaneously, and then makes the nonlinear effect of middle-infrared band to strengthening.
Technical solution of the present invention is as follows:
Infrared super continuum source in the full optical fiber of a kind of high-average power, feature is that its formation comprises: the pulse pump source of the band that connects successively along light path output tail optical fiber, one section of single mode passive fiber, at least one-level thulium doped fiber amplifier, the second optical-fiber bundling device and one section of er-doped fluoride fiber, the second pumping source is connected with the second input of described the second optical-fiber bundling device.
Described one-level thulium doped fiber amplifier is made up of the first pumping source, the first optical-fiber bundling device and one section of thulium-doped silica fib, described single mode passive fiber is connected with the first input end of the first described optical-fiber bundling device, and the first described pumping source is connected with the second input of the first described optical-fiber bundling device.
Between described each parts, be mutually welded together in the mode of fibre core alignment.
The output wavelength in the pulse pump source of described band output tail optical fiber in 1500 nanometers in 1760 nanometer range, output pulse width is that 1 to 20 nanosecond, peak power are greater than 1 kilowatt.
The core diameter of one section of described single mode passive fiber is less than 10 microns, and length is greater than 10 meters.
Described one section of thulium-doped silica fib and one section of er-doped fluoride fiber are doubly clad optical fiber.
One section of described er-doped fluoride fiber is ZBLAN optical fiber.The key component of ZBLAN optical fiber is ZrF
4-BaF
2-LaF
3-AlF
3-NaF, the ratio of each component is generally 53mol.%ZrF
4, 20mol.%BaF
2, 4mol.%LaF
3, 3mol.%AlF
3, 20mol.%NaF.
The output center wavelength of the first described pumping source in 750 nanometers in 820 nanometer range.
The output center wavelength of the second described pumping source in 910 nanometers in 980 nanometer range.
Compared with prior art, the present invention has adopted near the er-doped ZBLAN glass optical fiber of one section of activation of the pumping source pumping 975 nanometers by wavelength as the optical fiber of infrared excess continuous spectrum in final output, when its benefit is light by this section of optical fiber not only because nonlinear effect spectrum obtains broadening, simultaneously due near the existence of the Tricationic of the erbium emission peak 2.7 microns, the spectral component of corresponding wave band is exaggerated, and then makes the nonlinear effect of middle-infrared band to strengthening.This further broadening for spectrum and the raising of average power are all good.Simultaneously due to all optical fibre structure of the present invention, whole system stability is high, be easy to integrated and can under multiple external environment, work, and infrared super continuum source in this is had broad application prospects.
Accompanying drawing explanation
Fig. 1 is the structural representation of infrared super continuum source in high-average power of the present invention.
Fig. 2 is the simplification level structure schematic diagram of mixing thulium quartz glass and er-doped ZBLAN glass.Each arrow in figure has been pointed out the main transition process that the present invention uses.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in detail, but protection scope of the present invention is not limited to following embodiment.
Please first consult Fig. 1, Fig. 1 is the structural representation of infrared super continuum source in high-average power of the present invention.In the present embodiment, pulse pump source 1 is the erbium-ytterbium co-doped fiber laser of 1.55 microns of outputs, ps pulsed laser and ns pulsed laser, one section of SMF-28e optical fiber that single mode passive fiber 2 is Corning Incorporated, and length is 10 meters.The Output of laser in pulse pump source 1 is 1.5 microns to 2.2 microns by one section of rear spectrum widening of passive fiber 2, and in time domain, the pulse of each wavelength components is split into psec, femtosecond pulse by the nanosecond pulse of 1.55 microns.Then by by the first optical-fiber bundling device 3, the first pumping source 7 and one section of thulium doped fiber amplifier that thulium-doped silica fib 4 forms.Wherein the first optical-fiber bundling device 5 is (2+1) × 1 bundling device, near the high-power laser diode of wavelength 793 nanometers centered by the first pumping source 7, one section of thulium-doped silica fib 4 is single-mode double-clad optical fiber, and near the absorption coefficient 793 nanometers is about 3dB/ rice, 4 meters of length.Under the pumping effect of pump light, amplifier has produced high gain at 1.8 microns to 2.1 microns, has improved the average power of the super continuous spectrums passing through, simultaneously because nonlinear effect spectrum has obtained broadening therein.But because the Tricationic of thulium is in the existence of the absworption peak of 1.6 microns to 1.8 microns, the light of this wave-length coverage is absorbed, so be finally about 1.9 microns to 2.5 microns via the wave-length coverage of the high power super continuous spectrums of thulium doped fiber amplifier output.It should be noted that in Fig. 1, to only have one-level thulium doped fiber amplifier, if need to be amplified to higher power, also can connect multistage thulium doped fiber amplifier similarly here.
Enter the stage of the final broadening of spectrum to middle-infrared band that make.The second optical-fiber bundling device 4 is also (2+1) × 1 bundling device, and the second 8 of pumping sources are near the high-power laser diode of centre wavelength 975 nanoseconds.One section of er-doped fluoride fiber 6 is single-mode double-clad ZBLAN optical fiber, and near the absorption coefficient 975 nanometers is about 6dB/ rice, and length is 5 meters.Intrinsic loss while transmission in ZBLAN optical fiber due to middle-infrared band light is little, the high-average power super continuous spectrums experience that makes thulium doped fiber amplifier output is not absorbed to the non-linear broadening of middle-infrared band, meanwhile, because the er-doped ZBLAN optical fiber after being activated by pump light pumping has high gain near 2.7 microns, the super continuous spectrums of this wave-length coverage is exaggerated.Super continuous spectrums after amplification excites stronger nonlinear effect, produces more middle infrared spectrum composition.This cascade process makes the middle infrared excess continuous spectrum finally obtaining have very high-average power and very wide wavelength coverage simultaneously.
Fig. 2 is the simplification level structure schematic diagram of mixing thulium quartz glass and er-doped ZBLAN glass.Near the pump light of 793 nanometers that the first pumping source 7 is exported acts on one section of thulium-doped silica fib 4 have been caused
3h
6arrive
3h
4excited absorption process.Near super continuous spectrums 2 microns causes during by this section of optical fiber
3f
4arrive
3h
6stimulated emission process.Same, near the pump light 975 nanometers that the second pumping source 8 is exported acts on one section of er-doped fluoride fiber 6 have been caused
4i
15/2arrive
4i
11/2excited absorption process, in this section of optical fiber, caused by the super continuous spectrums of non-linear process broadening to 2.7 micron
4i
13/2arrive
4i
11/2stimulated emission process.
Claims (9)
1. infrared super continuum source in the full optical fiber of high-average power, be characterised in that its formation comprises: the pulse pump source (1) of the band that connects successively along light path output tail optical fiber, one section of single mode passive fiber (2), at least one-level thulium doped fiber amplifier, the second optical-fiber bundling device (5) and one section of er-doped fluoride fiber (6), the second pumping source (8) is connected with the second input of described the second optical-fiber bundling device (5).
2. infrared super continuum source in the full optical fiber of a kind of high-average power according to claim 1, it is characterized in that, described one-level thulium doped fiber amplifier is made up of the first pumping source (7), the first optical-fiber bundling device (3) and one section of thulium-doped silica fib (4), described single mode passive fiber (2) is connected with the first input end of described the first optical-fiber bundling device (3), and described the first pumping source (7) is connected with the second input of described the first optical-fiber bundling device (3).
3. infrared super continuum source in the full optical fiber of a kind of high-average power according to claim 1, is characterized in that, between described each parts, is mutually welded together in the mode of fibre core alignment.
4. infrared super continuum source in the full optical fiber of a kind of high-average power according to claim 1, it is characterized in that, the output wavelength in the pulse pump source (1) of described band output tail optical fiber is in 1500 nanometers in 1760 nanometer range, and output pulse width is that 1 to 20 nanosecond, peak power are greater than 1 kilowatt.
5. infrared super continuum source in the full optical fiber of a kind of high-average power according to claim 1, is characterized in that, the core diameter of described one section of single mode passive fiber (2) is less than 10 microns, and length is greater than 10 meters.
6. infrared super continuum source in the full optical fiber of a kind of high-average power according to claim 1, is characterized in that, described one section of thulium-doped silica fib (4) and one section of er-doped fluoride fiber (6) are doubly clad optical fiber.
7. infrared super continuum source in the full optical fiber of a kind of high-average power according to claim 1, is characterized in that, described one section of er-doped fluoride fiber (6) is ZBLAN optical fiber, and the key component of this ZBLAN optical fiber is ZrF
4-BaF
2-LaF
3-AlF
3-NaF, the ratio of each component is generally 53mol.%ZrF
4, 20mol.%BaF
2, 4mol.%LaF
3, 3mol.%AlF
3, 20mol.%NaF.
8. infrared super continuum source in the full optical fiber of a kind of high-average power according to claim 1, is characterized in that, the output center wavelength of described the first pumping source (7) in 750 nanometers in 820 nanometer range.
9. infrared super continuum source in the full optical fiber of a kind of high-average power according to claim 1, is characterized in that, the output center wavelength of described the second pumping source (8) in 910 nanometers in 980 nanometer range.
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Cited By (13)
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| CN104201545A (en) * | 2014-08-06 | 2014-12-10 | 深圳大学 | Ultra-wideband supercontinuum source based on two-waveband fiber optic laser |
| CN104950546A (en) * | 2015-07-09 | 2015-09-30 | 浙江大学 | Method for generating medium-wave infrared laser output with parametric conversion method |
| CN105140762A (en) * | 2015-07-30 | 2015-12-09 | 深圳市欧凌镭射科技有限公司 | Pulse fiber laser employing semiconductor laser seed source |
| CN105470796A (en) * | 2015-12-30 | 2016-04-06 | 江苏师范大学 | High-brightness ultra-wideband medium infrared super-continuum spectrum light source |
| CN105490139A (en) * | 2015-12-30 | 2016-04-13 | 深圳大学 | High-power all-fiber near and middle infrared super-continuum spectrum laser light source |
| CN105826800A (en) * | 2016-04-21 | 2016-08-03 | 宁波大学 | All-optical fiber broadband flat intermediate-infrared super-continuum spectrum light source |
| CN106842762A (en) * | 2017-04-20 | 2017-06-13 | 陕西师范大学 | It is a kind of to cascade the device that super continuous spectrums are produced |
| CN107293930A (en) * | 2016-04-01 | 2017-10-24 | 中国兵器装备研究院 | Integrated high power full-optical-fiber laser |
| CN107887784A (en) * | 2017-11-08 | 2018-04-06 | 深圳大学 | A kind of nanosecond pulse optical fiber laser |
| CN108879300A (en) * | 2018-06-04 | 2018-11-23 | 华南师范大学 | Super continuum source system and method based on the pumping of double bound state mode locking pulses |
| CN109103736A (en) * | 2018-10-31 | 2018-12-28 | 深圳技术大学（筹） | Infrared super-fluorescence light source in a kind of high power broad band full fibrillation |
| CN115275748A (en) * | 2022-08-10 | 2022-11-01 | 北京工业大学 | Mid-infrared broad spectrum laser based on 2 mu m waveband picosecond laser pumping |
| US11656420B2 (en) | 2021-01-22 | 2023-05-23 | Macleon, LLC | System and method of distributing ultra high power using optical fiber cable |
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| CN104201545A (en) * | 2014-08-06 | 2014-12-10 | 深圳大学 | Ultra-wideband supercontinuum source based on two-waveband fiber optic laser |
| CN104950546B (en) * | 2015-07-09 | 2017-12-15 | 浙江大学 | A kind of method that the output of medium-wave infrared laser is produced using parameter transform technology |
| CN104950546A (en) * | 2015-07-09 | 2015-09-30 | 浙江大学 | Method for generating medium-wave infrared laser output with parametric conversion method |
| CN105140762A (en) * | 2015-07-30 | 2015-12-09 | 深圳市欧凌镭射科技有限公司 | Pulse fiber laser employing semiconductor laser seed source |
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| CN106842762A (en) * | 2017-04-20 | 2017-06-13 | 陕西师范大学 | It is a kind of to cascade the device that super continuous spectrums are produced |
| CN106842762B (en) * | 2017-04-20 | 2022-12-06 | 陕西师范大学 | Device for generating cascade supercontinuum |
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| CN115275748A (en) * | 2022-08-10 | 2022-11-01 | 北京工业大学 | Mid-infrared broad spectrum laser based on 2 mu m waveband picosecond laser pumping |
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Application publication date: 20140528 |