CN101340053A - Medium-infrared thulium doped optical fiber laser amplifier - Google Patents
Medium-infrared thulium doped optical fiber laser amplifier Download PDFInfo
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- CN101340053A CN101340053A CNA200810041644XA CN200810041644A CN101340053A CN 101340053 A CN101340053 A CN 101340053A CN A200810041644X A CNA200810041644X A CN A200810041644XA CN 200810041644 A CN200810041644 A CN 200810041644A CN 101340053 A CN101340053 A CN 101340053A
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Abstract
The invention discloses a middle-infrared thulium-doped fiber laser amplifier which is composed of a seed light source, an optical isolator, a focusing lens, a pumping light source, a multi-path fiber coupler, double clad thulium-doped fiber, a collimating lens and a beam splitting plate. The position relationships of the components are as follows: the optical isolator, the focusing lens, the multi-path fiber coupler, the double clad thulium-doped fiber, the collimating lens and the beam splitting plate are sequentially arranged along the laser output direction of the seed light source, an input end of the seed optical fiber of the multi-path fiber coupler is positioned at the focus of the collimating lens, an output end of the seed optical fiber is welded with the double clad thulium-doped fiber, the other end of the double clad thulium-doped fiber is positioned at a front focus of the collimating lens, and the beam splitting plate and the output light beam of the collimating lens are arranged at an angle of 45 degrees. The laser amplifier has good heat dissipation characteristic, improves the pumping power and can obtain high-power mid-infrared laser output.
Description
Technical field
The present invention relates to laser, particularly a kind of in the infrared thulium laser fiber amplifier of mixing.
Background technology
After fiber laser came out in 1963, developed into the fine technology of light harvesting, coupling technique and semiconductor laser technique in the emerging technology of one, and become research focus in the last few years with its compact conformation, high efficiency, small size, long-life, advantage such as non-maintaining easy to use.High power 2 micron waveband lasers all have important use in industry, biomedicine and military affairs, realize that more effectively the method for this wave band of laser has at present: 1, all solid state pumping singly mixes solid state laser (HO:YAG, Tm:YAG, Tm:YAP etc.); 2, two solid state lasers (Ho:Tm:YAG, Ho:Tm:LuLiF, Er:Tm:YAG, Tm:Ho:YLF etc.) of mixing of all solid state pumping; 3, a micron waveband laser obtains by the OPO technology; 4, all solid state pumping mixes thulium or mixes the holmium fiber laser; Above-mentioned first three methods or because problem such as the thermal effect of solid laser crystal or pump absorption band be narrow causes slope efficiency not high; Some can't realize tunable laser output; The pumping source that has needs 1.9 micron wavebands; The not high deficiency of OPO efficient.The thulium-doped fiber laser of all solid state pumping is owing to adopt fiber medium, and has the cross relaxation characteristic, obtains the laser output of high tiltedly efficient easily; Output laser is wideband adjustable; Pumping source is ripe 790nm wave band diode; But need by frequency-selecting or diode pumping technology, this causes the problem of inefficiency usually.Obtaining at present infrared thulium doped optical fiber laser output in the high power is how to reduce the heat problem of thulium doped fiber and how more pump power is transported in the thulium doped fiber and go.The heat problem of thulium doped fiber mainly concentrates on optic fibre input end face place, and method commonly used is that the optic fibre input end face portion is adopted conduction or direct water-cooling but, but because fiber end face only is the tens of centimeter length of hundreds of micron core diameter usually, is difficult to take into account cooling and pumping; We propose infrared thulium doped fiber amplifier in a kind of novel high-power for this reason, utilize the advantage of thulium-doped fiber laser, the mode of injecting by the exocoel seed obtains the space-time characterisation of mid-infrared laser simultaneously, and the use power of avoiding frequency-selecting and diode pumping to produce reduces problem; Adopt the multiple-path coupler mode to improve pumping to the power of optical fiber and take into account the cooling problem that solved.
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art, provide a kind of in infrared thulium doped optical fiber laser amplifier, this optical fiber laser amplifier should have heat dissipation characteristics preferably, improves pump power, to obtain the output of high power mid-infrared laser.
The technical solution adopted in the present invention is:
Infrared thulium doped optical fiber laser amplifier in a kind of, the mode that adopts the exocoel seed to inject, N laser diode (LD) done pumping source, adopts the N+1 multiple-path coupler that pump light is introduced pumping double clad thulium doped fiber, and this double clad thulium doped fiber is done amplification medium.
Concrete structure of the present invention:
Infrared thulium doped optical fiber laser amplifier in a kind of, this optical fiber laser amplifier is by seed light source, optical isolator, condenser lens, pump light source, the multi-channel optical fibre coupler, the double clad thulium doped fiber, collimating lens and beam splitting chip constitute, its position relation is: the laser outbound course at described seed light source is optical isolator successively, condenser lens, the multi-channel optical fibre coupler, the double clad thulium doped fiber, collimating lens and beam splitting chip, described multi-channel optical fibre coupler, be written as the N+1 fiber coupler, combine by coupler and a seed optical fiber by N root pumping optical fiber, described pump light source is connected with described many pumping optical fibers respectively, the input of described seed optical fiber and the focus that is positioned at described condenser lens, the output of this seed optical fiber welds mutually with described double clad thulium doped fiber, the other end of this double clad thulium doped fiber is positioned at the front focus of described collimating lens, described beam splitting chip is to be coated with 45 ° of pump lights are all-trans and to the anti-reflection deielectric-coating of seed light wavelength, the output beam of this beam splitting chip and described collimating lens is 45 ° of settings.
The input end face of described seed optical fiber is coated with the anti-reflection film to seed light.
Described pump light source is the 793nm laser diode, and perhaps 1568nm's mixes the Er fiber laser.
Described seed light source is the thulium-doped fiber laser of the small-sized continuous solid body laser of 2 micron wavebands or small-sized pulsed solid stale laser of 2 micron wavebands or gain modulation.
The present invention compares with conventional art, has following advantage and good effect:
1, compare with common solid state laser, fiber amplifier has excellent heat dissipation characteristics;
2, adopt multiterminal N+1 pumping structure for amplifying, alleviating the thermal power density that the simple optical fiber fibre core is born, and can increase pumping effectively to as the power in the thulium doped fiber of amplification medium;
3, adopt the seed injection mode, the time response of control amplifier, spatial character and directivity, solve the inefficiency and the damage problem of the frequency-selecting of high power mid-infrared laser grating, during simultaneously as the pumping source of 3-12 laser micrometer, needing to have avoided diode pumping obtain problems such as pulsed light;
4, the pumping coupled modes that adopt pumping optical fiber and thulium doped fiber directly to weld, the problem that the high heat that produces in the time of can avoiding pump-coupling to the thulium doped fiber end face is difficult to cool off;
Description of drawings
Fig. 1 is the structural representation of infrared thulium doped fiber amplifier in the high power of the present invention;
Fig. 2 is a 8+1 road fiber coupler structural representation;
Among the figure: the 1-seed source; The 2-isolator; The 3-condenser lens; The 4-pump light source; 5-8+1 road fiber coupler; 6-double clad thulium doped fiber; The 7-collimating lens; The 8-beam splitting chip; The 9-pumping optical fiber; The 10-pumping optical fiber; The 11-pumping optical fiber; The 12-pumping optical fiber; The 13-coupler; 14-seed optical fiber; The 15-pumping optical fiber; The 16-pumping optical fiber; The 17-pumping optical fiber; The 18-pumping optical fiber.
Embodiment
The invention will be further described below in conjunction with embodiment and accompanying drawing, but should not limit protection scope of the present invention with this.
See also Fig. 1 and Fig. 2 earlier, Fig. 1 is the structural representation of a specific embodiment of the present invention for the structural representation of infrared thulium doped fiber amplifier in the high power of the present invention.Fig. 2 is a 8+1 road fiber coupler structural representation.As seen from the figure, infrared thulium doped optical fiber laser amplifier among the present invention, by seed light source 1, optical isolator 2, condenser lens 3, pump light source 4, multi-channel optical fibre coupler 5, double clad thulium doped fiber 6, collimating lens 7 and beam splitting chip 8 constitute, its position relation is: the laser outbound course at described seed light source 1 is optical isolator 2 successively, condenser lens 3, multi-channel optical fibre coupler 5, double clad thulium doped fiber 6, collimating lens 7 and beam splitting chip 8, described multi-channel optical fibre coupler 5 is by many pumping optical fibers 9,10,1,12,15,16,17,18 constitute by coupler 13 and a seed optical fiber 14, described pump light source 4 is made up of a plurality of laser diodes, respectively with described many pumping optical fibers 9,10,1,12,15,16,17,18 connect, the input of described seed optical fiber 14 and the focus that is positioned at described condenser lens 3, the output of this seed optical fiber 14 welds mutually with described double clad thulium doped fiber 6, the other end of this double clad thulium doped fiber 6 is positioned at the front focus of described collimating lens 7, described beam splitting chip 8 is to be coated with pump light 45 degree is all-trans and to the anti-reflection deielectric-coating of seed light wavelength, this beam splitting chip 8 is 45 ° of settings with the output beam of described collimating lens 7.The input end face of described seed optical fiber 14 is coated with the anti-reflection film to seed light.Described pump light source is the 793nm laser diode, and perhaps 1568nm's mixes the Er fiber laser.
Described seed light source 1 is the thulium-doped fiber laser of the small-sized continuous solid body laser of 2 micron wavebands or small-sized pulsed solid stale laser of 2 micron wavebands or gain modulation.
As shown in Figure 2 be 8+1 road fiber coupler 5, can import 8 road pump lights in optical fiber, with the seed light B end output from seed optical fiber 14 through coupler 13 coupling backs by seed optical fiber 14, B holds and welds mutually with an end of double clad thulium doped fiber 6; 6 is the double clad thulium doped fiber; 7 is collimating lens; 8 is beam splitting chip, is coated with pump light 45 degree are all-trans and 2 microns anti-reflection deielectric-coating.
Wherein the course of work is that seed light 1 and multichannel pump light 4 carry out pumping and seed light injection through 5 pairs of double clad thulium doped fibers of multi-channel optical fibre coupler 6; Wherein inject time response, spatial character and the directivity of control amplifier by seed; Because the special construction of multi-channel optical fibre coupler 5 can effectively reduce the pump power density that the fiber end face unit are is born, reduce influence of thermal effect, accept more pump light; The B end of double clad thulium doped fiber 14 welds mutually with an end of double clad thulium doped fiber 6, can carry out the integral body cooling to double clad thulium doped fiber 6 like this, effectively solves the problem that the thulium doped fiber input end face is difficult to fine cooling, can solve the heat problem of medium optical fiber.Double clad thulium doped fiber 6 is as the gain amplifier medium and transmit laser.The mid-infrared laser that produces through after the collimating lens 7 collimation outputs by beam splitting chip 8 beam split after as the pumping source of high power 3-12 laser micrometer or directly apply on biomedicine, remote sensing technology, optical communication, the radar.
Different pump powers can obtain different capacity laser output, select different seed sources can obtain different output spectrums, continuously or the mid-infrared laser of pulse.If adopt the optical fiber seed source, can also realize infrared thulium doped fiber amplifier in the full fiberize.In a word, laser of the present invention has heat dissipation characteristics preferably, has improved pump power, can obtain the output of high power mid-infrared laser.
Claims (4)
1, infrared thulium doped optical fiber laser amplifier in a kind of, it is characterized in that by seed light source (1), optical isolator (2), condenser lens (3), pump light source (4), multi-channel optical fibre coupler (5), double clad thulium doped fiber (6), collimating lens (7) and beam splitting chip (8) constitute, its position relation is: the laser outbound course at described seed light source (1) is optical isolator (2) successively, condenser lens (3), multi-channel optical fibre coupler (5), double clad thulium doped fiber (6), collimating lens (7) and beam splitting chip (8), described multi-channel optical fibre coupler (5) is by many pumping optical fibers (9,10,1,12,15,16,17,18) constitute by coupler (13) and a seed optical fiber (14), described pump light source (4) respectively with described many pumping optical fibers (9,10,1,12,15,16,17,18) connect, the input of described seed optical fiber (14) and the focus that is positioned at described condenser lens (3), the output of this seed optical fiber (14) welds mutually with described double clad thulium doped fiber (6), the other end of this double clad thulium doped fiber (6) is positioned at the front focus of described collimating lens (7), described beam splitting chip (8) is to be coated with pump light 45 degree is all-trans and to the anti-reflection deielectric-coating of seed light wavelength, this beam splitting chip (8) is 45 ° of settings with the output beam of described collimating lens (7).
2, infrared thulium doped optical fiber laser amplifier in according to claim 1, the input end face that it is characterized in that described seed optical fiber (14) is coated with the anti-reflection film to seed light.
3, infrared thulium doped optical fiber laser amplifier in according to claim 1 is characterized in that described pump light source is the 793nm laser diode, and perhaps 1568nm's mixes the Er fiber laser.
4, infrared thulium doped optical fiber laser amplifier in according to claim 1 is characterized in that described seed light source (1) is the thulium-doped fiber laser of the small-sized continuous solid body laser of 2 micron wavebands or small-sized pulsed solid stale laser of 2 micron wavebands or gain modulation.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA200810041644XA CN101340053A (en) | 2008-08-13 | 2008-08-13 | Medium-infrared thulium doped optical fiber laser amplifier |
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| CNA200810041644XA CN101340053A (en) | 2008-08-13 | 2008-08-13 | Medium-infrared thulium doped optical fiber laser amplifier |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102244340A (en) * | 2011-05-24 | 2011-11-16 | 中国科学院上海光学精密机械研究所 | Method for cooling non-quartz fiber laser device |
| CN102820607A (en) * | 2012-08-27 | 2012-12-12 | 武汉锐科光纤激光器技术有限责任公司 | Signal and pumping laser hybrid integrated device |
| CN103155308A (en) * | 2010-10-18 | 2013-06-12 | 新日铁住金株式会社 | Laser apparatus and laser processing apparatus provided with same |
| CN103439773A (en) * | 2013-08-28 | 2013-12-11 | 中国科学院半导体研究所 | High-power all-solid-state continuous laser beam combining system |
| KR20140097377A (en) * | 2011-05-03 | 2014-08-06 | 아이피지 포토닉스 코포레이션 | High power single mode fiber laser system for wavelengths operating in 2㎛ range |
| CN113708204A (en) * | 2021-09-26 | 2021-11-26 | 中国科学院半导体研究所 | Multi-cavity composite pulse laser and multi-cavity composite pulse laser amplifier |
| CN115483601A (en) * | 2022-10-28 | 2022-12-16 | 北京工业大学 | Mode control and nonuniform gain based ultra-large mode field thulium-doped optical fiber amplifier device |
-
2008
- 2008-08-13 CN CNA200810041644XA patent/CN101340053A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103155308A (en) * | 2010-10-18 | 2013-06-12 | 新日铁住金株式会社 | Laser apparatus and laser processing apparatus provided with same |
| US9172202B2 (en) | 2010-10-18 | 2015-10-27 | Nippon Steel & Sumitomo Metal Corporation | Laser apparatus and laser materials processing apparatus provided with same |
| KR20140097377A (en) * | 2011-05-03 | 2014-08-06 | 아이피지 포토닉스 코포레이션 | High power single mode fiber laser system for wavelengths operating in 2㎛ range |
| KR101698143B1 (en) * | 2011-05-03 | 2017-02-01 | 아이피지 포토닉스 코포레이션 | High power single mode fiber laser system for wavelengths operating in 2㎛ range |
| CN102244340A (en) * | 2011-05-24 | 2011-11-16 | 中国科学院上海光学精密机械研究所 | Method for cooling non-quartz fiber laser device |
| CN102820607A (en) * | 2012-08-27 | 2012-12-12 | 武汉锐科光纤激光器技术有限责任公司 | Signal and pumping laser hybrid integrated device |
| CN102820607B (en) * | 2012-08-27 | 2014-01-15 | 武汉锐科光纤激光器技术有限责任公司 | Signal and pumping laser hybrid integrated device |
| CN103439773A (en) * | 2013-08-28 | 2013-12-11 | 中国科学院半导体研究所 | High-power all-solid-state continuous laser beam combining system |
| CN103439773B (en) * | 2013-08-28 | 2015-05-13 | 中国科学院半导体研究所 | High-power all-solid-state continuous laser beam combining system |
| CN113708204A (en) * | 2021-09-26 | 2021-11-26 | 中国科学院半导体研究所 | Multi-cavity composite pulse laser and multi-cavity composite pulse laser amplifier |
| CN115483601A (en) * | 2022-10-28 | 2022-12-16 | 北京工业大学 | Mode control and nonuniform gain based ultra-large mode field thulium-doped optical fiber amplifier device |
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