CN103022860A - Tunable ytterbium-doping double-clad fiber mode-locked laser - Google Patents
Tunable ytterbium-doping double-clad fiber mode-locked laser Download PDFInfo
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Abstract
The invention discloses a tunable ytterbium-doping double-clad fiber mode-locked laser which belongs to the technical field of lasers. The tunable ytterbium-doping double-clad fiber mode-locked laser is in an annular cavity structure, takes a large-core diameter double-clad ytterbium-doping fiber as a gain medium and works on a total positive dispersion area. The tunable ytterbium-doping double-clad fiber mode-locked laser realizes the mode locking self-starting and stably carries out mode locking by dint of a nonlinear polarization rotation technology and a spectrum filter, is adjustable in filtering bandwidth because the spectrum filter comprises a grating and a slit with adjustable width, has a tuning function and can continuously tune the center wavelength of an output pulse within a gain bandwidth range. The tunable ytterbium-doping double-clad fiber mode-locked laser disclosed by the invention realizes the total positive dispersion mode locking of the large-core diameter double-clad fiber by adopting nonlinear polarization rotation and a spectrum filter technology, obtains the ultrashort-pulse laser output supporting high power and high single-pulse energy, is continuously tunable in center wavelength and is convenient to operate and large in tuning range by composing the spectrum filter by adopting the grating and the slit.
Description
Technical field
The present invention relates to a kind of tunable yb-doped double-clad fiber mode-locked laser, exportable high power, large single pulse energy, the ultrashort pulse that centre wavelength is adjustable belong to laser technology field.
Background technology
Semiconductor pumped mode locked fiber laser is owing to having many good characteristics such as compact conformation, with low cost, good heat dissipation effect and output beam quality height, caused in recent years researcher's very big concern and become a focus direction of current ultra-short pulse laser technical field.Wherein mix the ytterbium silica fiber and have light-light conversion efficiency up to 80%, larger gain bandwidth support is less than the Fourier transform limit pulse of 30fs, and increasingly mature double clad technology allows optical fiber to utilize high-power multiple die semiconductor laser pump-coupling, so that Yb dosed optical fiber especially is fit to the ultra-short pulse laser system of exploitation high power, macro-energy.Great many of experiments and studies show that, the fiber laser of Totally positive dispersion structure more are conducive to obtain the ultrashort pulse output of high power, macro-energy.
The tunable ultra-short pulse source of centre wavelength has important application at aspects such as biotechnology, optical measurement, ultrafast spectroscopy.Document [1] (Chong A., Buckley J., Renninger W.and Wise F., All-normal-dispersion femtosecond fiber laser, Opt.Express, 2006,14 (21): 10095-10100) reported a kind of mode locked fiber laser that is operated in the Totally positive dispersion district, this laser adopts the nonlinear polarization rotation effect as equivalent saturable absorber, realize the locked mode self-starting, and enter spectral filter in the chamber interpolation additional Modulation and Amplitude Modulation is provided, play the effect of compressed pulse widths and stable mode-locking.The output of Totally positive dispersion mode locked fiber laser has the broad pulse of high chirping characteristics, and can be compressed into the pulse of the nearly Fourier transform limit through the compensation of chamber Laser with External Dispersive.High chirped pulse has reduced the nonlinear effect of peak power and optical fiber effectively in the chamber, so that the Totally positive dispersion fiber laser can be supported larger power and single pulse energy.Gain media is common single-mode ytterbium-doping optical fiber in the document [1], and mode field area is less, has limited the further raising of its average power and single pulse energy.
The application of doubly clad optical fiber technology, so that having had significantly, the power output of fiber laser improves, document [2] (Kieu K., Renninger W., Chong A.and Wise F., Sub-100fs pulses at watt-level powers from a dissipative-soliton fiber laser, Opt.Lett., 2009,34 (5): 593-595), document [3] (Lefrancois S., Kieu K., Deng Y., Kafka J.D.and Wise F.W., Scaling of dissipative soliton fiber lasers to megawatt peak powers by use of large-area photonic crystal fiber, Opt.Lett., 2010,35 (10): 1569-1571) adopt Double Cladding Ytterbium Doped Fiber as gain media, by annular chamber nonlinear polarization rotation effect, and the spectral filter that inserts respectively 15nm and 12nm in the chamber has been realized stable Totally positive dispersion dissipation orphan locked mode.Doubly clad optical fiber core diameter in its Literature [2] is 10 μ m, and fibre core is less, can't support too large power.Gain fibre in the document [3] is the double-clad photon crystal optical fibre of large core diameter, and the single mode core diameter reaches 40 μ m, supports the output average power can surpass 10W.These two kinds of structure Totally positive dispersion mode locked fiber lasers all insert filter plate provides the spectral filtering function, be inconvenient to regulate filtering bandwidth, and output wavelength is single, does not have tuber function.
Document [4] (Kong L., Xiao X.and Yang C., Tunable all-normal-dispersion Yb-doped mode-locked fiber lasers, Laser Phys., 2010,20 (4): 834-837), document [5] (Lou J.W., Currie M.and Fatemi F.K., Experimental measurements of solitary pulse characteristics from an all-normal-dispersion Yb-doped fiber laser, Opt.Express, 2007,15 (8): 4960-4965) reported the tunable mode-locked fiber laser that is operated in the Totally positive dispersion district, two kinds of structures all adopt tunable filter plate as spectral filter and realize tuber function, but gain fibre be general single mode fiber also so that these two kinds of Mode-locking For Lasers Power Limitation below 100mW.Chinese invention patent " a kind of tunable all-fiber mode-locked laser " (CN101969174A) has proposed to utilize that single mode is tunable carries out the tuning of output wavelength with flow-through long period fiber grating system, tuning range is 0-12nm, but fiber grating must rely on ambient temperature or stress changes to realize tuber function, implements comparatively complexity and tuning range narrower.
Summary of the invention
For overcoming the deficiency on the prior art, the invention provides a kind of tunable yb-doped double-clad fiber mode-locked laser, this laser is ring cavity structure, take large core diameter Double Cladding Ytterbium Doped Fiber as gain media, be operated in the Totally positive dispersion district, realize locked mode self-starting and stable mode-locking by nonlinear polarization rotation technology and spectral filter, spectral filter is made of the slit of grating and an adjustable-width, filtering bandwidth is adjustable, and has tuber function.The ultra-short pulse laser of the exportable high-average power of this laser, large single pulse energy, and output center wavelength continuously adjustable, tuber function are easy to realize, and be easy to operate.
The present invention is achieved by the following technical solutions.A kind of tunable yb-doped double-clad fiber mode-locked laser, for being operated in the annular chamber Mode-locked laser device in Totally positive dispersion district, it comprises a diode-end-pumped source, three non-spherical lenses, two dichroic mirrors, gain fibre, equivalent saturable absorber, optical isolator and spectral filters.Wherein spectral filter is made of grating (8) and slit (9), and the width of slit is adjustable, is placed on the inferior light path of optical grating diffraction energy maximum level.Grating (8) is balzed grating,, and blaze wavelength is 1000nm, is fixed on the two dimension angular adjustment rack.By changing the width of slit (9), the size that can regulate filtering bandwidth, the angle of regulating simultaneously grating can realize the wavelength tuning function of this spectral filter.
Gain fibre (14) is for mixing the large core diameter doubly clad optical fiber of ytterbium, or is the ytterbium-doped double-cladded-layer photonic crystal fiber, and core diameter is 20-40 μ m, is single mode to the laser in the 1020-1080nm wave-length coverage, and cladding diameter is 250-400 μ m, is multimode to pump light.Larger core diameter is conducive to reduce nonlinear effect, supports larger power and single pulse energy.
This laser realizes that the equivalent saturable absorber of locked mode adopts the nonlinear polarization rotation structure, be made of hold concurrently Laser output port (6), the second quarter wave plate (10), the second half-wave plate (11) of the first half-wave plate (4), the first quarter wave plate (5), the polarization beam apparatus placed in order on the space optical path, the pulse that produces by the inside of optical fibre nonlinear effect realizes locked mode self-starting and pulse-shaping from the amplitude modulation.
Compare with the similar mode-locked laser of reporting in the past, the present invention has the following advantages:
1. aperture and slot set cooperation are spectral filter, and filtering bandwidth is adjustable and not limited by external condition, be easy to realize, and while Output of laser centre wavelength continuously-tuning, and wavelength tuning range is large.This invention is so that laser output wavelength can be tuning in the 1025nm-1075nm scope.
2. large core diameter yb-doped double-clad fiber or double-clad photon crystal optical fibre are realized dissipation orphan locked mode in conjunction with nonlinear polarization rotation technology and spectral filtering technology, effectively reduce nonlinear effect and avoided the low shortcoming of semiconductor saturable absorbing mirror damage threshold, that has greatly improved mode-locked laser bears power and energy, maximum output average power can reach more than the 10W, and single pulse energy reaches more than the 100nJ.
3. laser works need not dispersion compensation in the Totally positive dispersion district, and is simple and compact for structure, cheap.
Description of drawings
Fig. 1 is tunable yb-doped double-clad fiber mode-locked laser structural representation of the present invention
Among the figure: 1 is the diode-end-pumped source; 2 is the first non-spherical lens; 3 is the first dichroic mirror; 4 is the first half-wave plate; 5 is the first quarter wave plate; 6 is polarization beam apparatus; 7 is optical isolator; 8 is grating; 9 is slit; 10 is the second quarter wave plate; 11 is the second half-wave plate; 12 is the second dichroic mirror; 13 is the 3rd non-spherical lens; 14 is gain fibre; 15 is the second non-spherical lens.
Fig. 2 is that filtering bandwidth is regulated and the tuning schematic diagram of laser center wavelength.
Fig. 3 is laser output tunable spectrum.
Embodiment
The invention will be further described below in conjunction with drawings and Examples:
In the embodiment shown in fig. 1, diode-end-pumped source (1) output 976nm dc laser is as pump light, by seeing through the first dichroic mirror (3) behind the first non-spherical lens (2) collimation, the first dichroic mirror (3) to the pump light transmitance greater than 95%, the pump light that sees through injects gain fibre (14) through the second non-spherical lens (15) coupling again, gain fibre (14) is for mixing the large core diameter doubly clad optical fiber of ytterbium, core diameter is 30 μ m, cladding diameter is 250 μ m, and length is got 1.5m.Regulate the pump light coupling efficiency to maximum and increase pumping light power, gain fibre (14) gives off fluorescence under the pump light excitation, fluorescence sees through the second non-spherical lens (15) and is coupled to free space, the first dichroic mirror (3) is high anti-to the fluorescence that produces, on its reflected light path, place successively the first half-wave plate (4), the first quarter wave plate (5), polarization beam apparatus hold concurrently Laser output port (6), optical isolator (7) and grating (8), wherein optical isolator (7) guarantees the one-way circulation of laser generation.On the light path of grating (8) diffraction energy maximum level time, place successively slit (9), the second quarter wave plate (10), the second half-wave plate (11), the second dichroic mirror (12), fluorescence is after the second dichroic mirror (12) reflection, inject gain fibre (14) by the 3rd non-spherical lens (13) again, consist of a complete unidirectional loop fiber laser cavity.Gain fibre (14) is positive dispersion to the laser that produces, and does not have the negative dispersion compensation element in the chamber, thus in the present embodiment laser works in the Totally positive dispersion district.Pump power is increased to more than the threshold value, regulate light path and make laser cavity form the closed-loop path, laser can be operated in dc state, locates to receive and to monitor Output of laser at the polarization beam apparatus Laser output port (6) of holding concurrently.
In the present embodiment, as shown in Figure 1, hold concurrently Laser output port (6), the second quarter wave plate (10), the second half-wave plate (11) of the first half-wave plate (4), the first quarter wave plate (5), polarization beam apparatus forms the nonlinear polarization rotation structure jointly as the equivalent saturable absorber of fiber laser locked mode, and that utilizes that nonlinear polarization rotation effect in the optical fiber produces realizes the locked mode self-starting from the amplitude modulation.Grating (8) consists of a spectral filter with slit (9), and by the broadening effect of filter action equalizing pulse in positive dispersion fiber to edge before and after the high chirped pulse, spectral filter plays an important role for pulse-shaping and stable mode-locking.By rotation quarter wave plate and half-wave plate angular adjustment endovenous laser power and polarization state, change simultaneously slit (9) width adjusting spectral filtering bandwidth, when pump power when the locked mode threshold value is above, can obtain stable locked mode running.Owing to having adopted this dissipative element of spectral filter, this locked mode mode Totally positive dispersion dissipation orphan locked mode that is otherwise known as.Progressively increase pumping light power, and suitably regulate the wave plate angle, locked mode power maximum can reach more than the 10W.As shown in Figure 2, the spectral filter that grating (8) and slit (9) form is except regulating filtering bandwidth, the function that also has wavelength tuning, by regulating the angle of grating (8), can change the wavelength by slit (9), thereby make locked mode centre wavelength continuously adjustable in the 1025nm-1075nm scope of laser, tuning bandwidth can reach 50nm.
Claims (3)
1. tunable yb-doped double-clad fiber mode-locked laser, for being operated in the annular chamber Mode-locked laser device in Totally positive dispersion district, it comprises a diode-end-pumped source, three non-spherical lenses, two dichroic mirrors, gain fibre, equivalent saturable absorber, optical isolator and spectral filters, it is characterized in that: described spectral filter is made of grating and slit, wherein slit width is adjustable, be placed on the inferior light path of optical grating diffraction energy maximum level, grating is balzed grating,, blaze wavelength is 1000nm, and grating is fixed on the two dimension angular adjustment rack.
2. tunable yb-doped double-clad fiber mode-locked laser according to claim 1, it is characterized in that: described gain fibre is for mixing the large core diameter doubly clad optical fiber of ytterbium, or be the ytterbium-doped double-cladded-layer photonic crystal fiber, core diameter is 20-40 μ m, is single mode for the laser in the 1020-1080nm wave-length coverage.
3. tunable yb-doped double-clad fiber mode-locked laser according to claim 1, it is characterized in that: described equivalent saturable absorber adopts the nonlinear polarization rotation structure, is made of hold concurrently Laser output port, the second quarter wave plate, the second half-wave plate of the first half-wave plate, the first quarter wave plate, the polarization beam apparatus placed successively on the space optical path.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103779767A (en) * | 2014-01-10 | 2014-05-07 | 北京大学 | Full-positive-dispersion er-doped optical-fiber laser device based on optical-grating filtering and adjustment method thereof |
| CN104577679A (en) * | 2015-01-29 | 2015-04-29 | 深圳市创鑫激光股份有限公司 | Passive mode-locked fiber laser |
| TWI509923B (en) * | 2013-05-20 | 2015-11-21 | Nat Univ Tsing Hua | Fiber laser |
| CN106253042A (en) * | 2016-10-21 | 2016-12-21 | 陕西师范大学 | Broadband based on super continuum source is tunable pulse optical fiber |
| CN107248691A (en) * | 2017-04-22 | 2017-10-13 | 天津大学 | The ultrashort pulse fiber laser of PLC technology based on digital micro-mirror device |
| CN108039638A (en) * | 2017-12-08 | 2018-05-15 | 中国科学院西安光学精密机械研究所 | Low threshold twin-stage light spectrum reshaping flexible optical fibre high power mode-locked laser |
| CN108649418A (en) * | 2018-06-22 | 2018-10-12 | 天津欧泰激光科技有限公司 | Can self-starting Spectral Broadening and offset filtering mode-locked laser |
| CN111095694A (en) * | 2017-09-05 | 2020-05-01 | 国立研究开发法人量子科学技术研究开发机构 | Laser device, light source, and measuring device |
| CN113036582A (en) * | 2019-12-23 | 2021-06-25 | 上海禾赛科技股份有限公司 | Laser, laser radar including the same, and scanning method of the laser radar |
| CN113131319A (en) * | 2021-04-02 | 2021-07-16 | 清华大学 | Pulse fiber laser |
| CN113314928A (en) * | 2021-04-19 | 2021-08-27 | 中国科学院福建物质结构研究所 | High repetition frequency 1.55 mu m all-fiber pulse laser |
| CN113875102A (en) * | 2019-04-25 | 2021-12-31 | 罗切斯特大学 | Drive chamber femtosecond source |
| CN113964634A (en) * | 2021-09-29 | 2022-01-21 | 华东师范大学重庆研究院 | Electric control tuning non-reciprocal phase shifter and polarization filter |
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Cited By (20)
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| TWI509923B (en) * | 2013-05-20 | 2015-11-21 | Nat Univ Tsing Hua | Fiber laser |
| CN103779767A (en) * | 2014-01-10 | 2014-05-07 | 北京大学 | Full-positive-dispersion er-doped optical-fiber laser device based on optical-grating filtering and adjustment method thereof |
| CN104577679A (en) * | 2015-01-29 | 2015-04-29 | 深圳市创鑫激光股份有限公司 | Passive mode-locked fiber laser |
| CN104577679B (en) * | 2015-01-29 | 2015-12-30 | 深圳市创鑫激光股份有限公司 | A kind of passive mode-locking fiber laser |
| CN106253042B (en) * | 2016-10-21 | 2023-04-25 | 陕西师范大学 | Broadband tunable pulse fiber laser based on supercontinuum light source |
| CN106253042A (en) * | 2016-10-21 | 2016-12-21 | 陕西师范大学 | Broadband based on super continuum source is tunable pulse optical fiber |
| CN107248691A (en) * | 2017-04-22 | 2017-10-13 | 天津大学 | The ultrashort pulse fiber laser of PLC technology based on digital micro-mirror device |
| CN107248691B (en) * | 2017-04-22 | 2023-08-15 | 天津大学 | Programmable control ultra-short pulse fiber laser based on digital micromirror device |
| CN111095694A (en) * | 2017-09-05 | 2020-05-01 | 国立研究开发法人量子科学技术研究开发机构 | Laser device, light source, and measuring device |
| US11482831B2 (en) | 2017-09-05 | 2022-10-25 | National Institutes for Quantum Science and Technology | Laser device, light source, and measurement apparatus |
| CN108039638B (en) * | 2017-12-08 | 2024-01-05 | 中国科学院西安光学精密机械研究所 | Low-threshold two-stage spectrum shaping flexible optical fiber high-power mode-locked laser |
| CN108039638A (en) * | 2017-12-08 | 2018-05-15 | 中国科学院西安光学精密机械研究所 | Low threshold twin-stage light spectrum reshaping flexible optical fibre high power mode-locked laser |
| CN108649418A (en) * | 2018-06-22 | 2018-10-12 | 天津欧泰激光科技有限公司 | Can self-starting Spectral Broadening and offset filtering mode-locked laser |
| CN108649418B (en) * | 2018-06-22 | 2024-02-02 | 天津欧泰激光科技有限公司 | Self-starting nonlinear spectrum broadening and offset filtering mode-locked laser |
| CN113875102A (en) * | 2019-04-25 | 2021-12-31 | 罗切斯特大学 | Drive chamber femtosecond source |
| CN113036582A (en) * | 2019-12-23 | 2021-06-25 | 上海禾赛科技股份有限公司 | Laser, laser radar including the same, and scanning method of the laser radar |
| CN113036582B (en) * | 2019-12-23 | 2024-01-26 | 上海禾赛科技有限公司 | Laser, laser radar comprising same and laser radar scanning method |
| CN113131319A (en) * | 2021-04-02 | 2021-07-16 | 清华大学 | Pulse fiber laser |
| CN113314928A (en) * | 2021-04-19 | 2021-08-27 | 中国科学院福建物质结构研究所 | High repetition frequency 1.55 mu m all-fiber pulse laser |
| CN113964634A (en) * | 2021-09-29 | 2022-01-21 | 华东师范大学重庆研究院 | Electric control tuning non-reciprocal phase shifter and polarization filter |
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Application publication date: 20130403 |