CN103050873A - High-power pulse type ytterbium-doped all-fiber laser system - Google Patents
High-power pulse type ytterbium-doped all-fiber laser system Download PDFInfo
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Abstract
The invention discloses a high-power pulse type ytterbium-doped all-fiber laser system. The system comprises a master oscillator and a power amplifier, wherein the main oscillator can be a Q-switched all-fiber laser, a fiber coupled gain switch pulse semiconductor laser working in 1 micrometer band, or a laser pulse obtained by modulating a continuous fiber laser; by taking the Q-switched fiber laser using piezoelectric elements as Q-switched elements as the example, the Q-switched fiber laser comprises a pump semiconductor laser, a beam combiner, a high-reflectivity fiber Bragg grating, an ytterbium-doped fiber, the piezoelectric elements and a modulation signal driving circuit thereof, a low-reflectivity fiber Bragg grating written on a polarization maintaining fiber, and an output fiber, wherein the power amplifier is a fiber amplifier formed by one or a plurality of amplifying stages; each fiber amplifying stage comprises the pump semiconductor laser, the beam combiner, and the ytterbium-doped fiber; and one fiber isolator is arranged between each amplifying stage. The system has the advantages that the whole system only needs air cooling, and is small in size, excellent in light spot, stable, reliable, and simple to maintain.
Description
Technical field
The present invention relates to a kind of fiber laser, especially a kind of high power pulse type ytterbium-doped all fibre laser system belongs to optical fiber and laser technology field.
Background technology
Fiber laser is the laser take the optical fiber of doped with rare-earth elements as gain media, by the different rare earth element that mixes, such as bait (Er), an an ancient unit of weight equal to 20 or 24 *taels of silver (Yb), thulium (Tm), holmium (Ho), neodymium (Nd) etc., the service band of fiber laser covered from ultraviolet to infrared.Compare with other lasers, it is low that fiber laser has the laser work threshold value, energy transformation ratio is high, output beam quality is good, compact conformation is stablized, need not the light path adjustment, perfect heat-dissipating, the life-span is long and the distinguishing feature such as Maintenance free, therefore is rapidly developed and uses widely.
Than the continuous type fiber laser, the fiber laser of impulse type can provide relatively high peak power and pulse energy, more is conducive to the application in some field, such as degree of depth mark, nonlinear optics etc.Therefore develop a kind of high power pulse type full-optical-fiber laser and its industrialization is had important economic benefit and social benefit.
Summary of the invention
The purpose of this invention is to provide a kind of whole system only need be air-cooled, and volume is little, hot spot is excellent, working stability is reliable, the pulse laser system of the full fiberize of the simple high power of maintenance.
The present invention is realized by the following technical programs.
A kind of high power pulse type ytterbium-doped all fibre laser system is characterized in that: it comprises that master oscillator (1) and power amplifier (2) two parts form,
Described master oscillator is that a kind of use piezoelectric element (piezoelectric element) is as the Q adjusting optical fiber laser (see figure 2) of Q switched element, it comprises the pumping semiconductor laser (3) with tail optical fiber, its output tail optical fiber is connected in the pumping input port (4) of optical-fiber bundling device, the output optical fibre port of optical-fiber bundling device connects high reflective fine Bragg grating (5), the other end of grating (5) and yb-doped double-clad fiber (6) weld together, the other end of yb-doped double-clad fiber with write the low reflective fine Bragg grating (9) that is formed on the polarization maintaining optical fibre and weld mutually, be provided with modulation signal drive circuit (8) and piezoelectric element (7) between yb-doped double-clad fiber and low reflective fine Bragg grating (9), modulation signal drive circuit (8) is used for driving piezoelectric element (7) and periodically presses the chamber inner fiber with the polarization direction of light modulated, low reflective fine Bragg grating (9) other end links to each other with the power amplifier signal input part
Or described master oscillator is a kind of Q adjusting optical fiber laser (see figure 3) take acousto-optic modulator or electrooptic modulator as Q switched element, it comprises the pumping semiconductor laser (3) with tail optical fiber, its output tail optical fiber is connected in the pumping input port (4) of optical-fiber bundling device, the output optical fibre port of optical-fiber bundling device connects high reflective fine Bragg grating (5), the other end of grating (5) and yb-doped double-clad fiber (6) weld together, the other end of yb-doped double-clad fiber is connected with coupling fiber acousto-optic modulator or electrooptic modulator (14), modulator (14) other end welds mutually with low reflective fine Bragg grating (9), low reflective fine Bragg grating (9) other end links to each other with the power amplifier signal input part
Or described master oscillator is a kind of laser pulse (see figure 4) that obtains that the continuous type fiber laser is modulated, it comprises the pumping semiconductor laser (3) with tail optical fiber, its output tail optical fiber is connected in the pumping input port (4) of optical-fiber bundling device, the output optical fibre port of optical-fiber bundling device connects high reflective fine Bragg grating (5), the other end of grating (5) and yb-doped double-clad fiber (6) weld together, the other end of yb-doped double-clad fiber welds mutually with low reflective fine Bragg grating (9), low reflective fine Bragg grating (9) other end is connected with coupling fiber acousto-optic modulator or electrooptic modulator (14), modulator (14) other end links to each other with the power amplifier signal input part
Or described master oscillator is a kind of gain switch with tail optical fiber (gain switch) type impulse semiconductor laser (see figure 5), it comprises electric pulse driver (15), wavelength is operated in the semiconductor laser with tail optical fiber (16) of 1um wave band, electric pulse driver output current pulsed drive semiconductor laser output laser pulse;
Described power amplifier is comprised of one or several cascaded optical fiber amplifying stage, wherein each fiber amplifier level comprises: an optical-fiber bundling device (4), the signal end inoculation component (1) of optical-fiber bundling device or the output of previous stage fiber amplifier level, the pumping termination pumping laser (10) of optical-fiber bundling device, the output of optical-fiber bundling device links to each other with gain fibre (large core diameter yb-doped double-clad fiber) (11), a welding fibre optic isolater (12) between each fiber amplifier level, afterbody fiber amplifier level output termination output optical fibre (13).
The pumping laser (10) that described power amplifier (2) uses can be the semiconductor laser with tail optical fiber, operation wavelength is 915 nanometers, 940 nanometers or 978 nanometers, employed pumping laser (10) can also be ytterbium-doping optical fiber laser, adopts the band pump mode that large core diameter yb-doped double-clad fiber is carried out pumping.
In the described power amplifier (2), can adopt forward pumping mode (see figure 6) to the pumping of large core diameter yb-doped double-clad fiber, can also adopt backward pumping mode (see figure 7) or Direct/Reverse pump mode and use (see figure 8).
Described output optical fibre (13), output is molten the quartz glass end cap, is 8 degree and is coated with the flashlight antireflection film with tilt angle and at end face, to suppress self-oscillation.
The invention has the advantages that it has realized the pulse laser system of the full fiberize of high power, whole system only needs air-cooled, and volume is little, hot spot is excellent, reliable and stable, safeguard simple.
Description of drawings
Fig. 1 is a kind of structure chart diagram of the present invention.
Fig. 2 is the first structural representation of master oscillator among the present invention.
Fig. 3 is the second structural representation of master oscillator among the present invention.
Fig. 4 is the third structural representation of master oscillator among the present invention.
Fig. 5 is the 4th kind of structural representation of master oscillator among the present invention.
Fig. 6 is a kind of structural representation of intermediate power amplifier of the present invention.
Fig. 7 is the another kind of structural representation of intermediate power amplifier of the present invention.
Fig. 8 is another structural representation of intermediate power amplifier of the present invention.
Fig. 9 is the pulse shape schematic diagram of master oscillator.
Figure 10 is the laser pulse schematic diagram that the present invention exports.
Mark among the figure: master oscillator 1, power amplifier 2, semiconductor pump laser 3, optical-fiber bundling device (combiner or WDM) 4, high reflectance Fiber Bragg Grating FBG 5, yb-doped double-clad fiber 6, piezoelectric element (piezoelectric element) 7, piezoelectric element modulation signal drive circuit 8, antiradar reflectivity Fiber Bragg Grating FBG 9, pump laser 10, large core diameter yb-doped double-clad fiber 11, fibre optic isolater 12, output optical fibre 13.
Embodiment
The invention will be further described below in conjunction with accompanying drawing:
As shown in Figure 1, a kind of high power pulse type ytterbium-doped all fibre laser is characterized in that: it comprises that master oscillator (1) and power amplifier (2) two parts form,
Described master oscillator is that a kind of use piezoelectric element (piezoelectric element) is as the Q adjusting optical fiber laser (see figure 2) of Q switched element, it comprises the pumping semiconductor laser (3) with tail optical fiber, its output tail optical fiber is connected in the pumping input port (4) of optical-fiber bundling device, the output optical fibre port of optical-fiber bundling device connects high reflective fine Bragg grating (5), the other end of grating (5) and yb-doped double-clad fiber (6) weld together, the other end of yb-doped double-clad fiber with write the low reflective fine Bragg grating (9) that is formed on the polarization maintaining optical fibre and weld mutually, be provided with modulation signal drive circuit (8) and piezoelectric element (7) between yb-doped double-clad fiber and low reflective fine Bragg grating (9), modulation signal drive circuit (8) is used for driving piezoelectric element (7) and periodically presses the chamber inner fiber and hang down reflective fine Bragg grating (9) other end with the polarization direction of light modulated and link to each other with the power amplifier signal input part; Described master oscillator is can also be a kind of Q adjusting optical fiber laser (see figure 3) take acousto-optic modulator or electrooptic modulator as Q switched element, it comprises the pumping semiconductor laser (3) with tail optical fiber, its output tail optical fiber is connected in the pumping input port (4) of optical-fiber bundling device, the output optical fibre port of optical-fiber bundling device connects high reflective fine Bragg grating (5), the other end of grating (5) and yb-doped double-clad fiber (6) weld together, the other end of yb-doped double-clad fiber is connected with coupling fiber acousto-optic modulator or electrooptic modulator (14), the modulator other end welds mutually with low reflective fine Bragg grating (9), low reflective fine Bragg grating (9) other end links to each other with the power amplifier signal input part, described master oscillator can also be a kind of laser pulse (see figure 4) that obtains that the continuous type fiber laser is modulated, it comprises the pumping semiconductor laser (3) with tail optical fiber, its output tail optical fiber is connected in the pumping input port (4) of optical-fiber bundling device, the output optical fibre port of optical-fiber bundling device connects high reflective fine Bragg grating (5), the other end of grating (5) and yb-doped double-clad fiber (6) weld together, the other end of yb-doped double-clad fiber welds mutually with low reflective fine Bragg grating (9), low reflective fine Bragg grating (9) other end is connected with coupling fiber acousto-optic modulator or electrooptic modulator (14), the modulator other end links to each other with the power amplifier signal input part, described master oscillator can also be a kind of gain switch with tail optical fiber (gain switch) type impulse semiconductor laser (see figure 5), it comprises electric pulse driver (15), and wavelength is operated in the semiconductor laser with tail optical fiber (16) of 1um wave band.Electric pulse driver output current pulsed drive semiconductor laser output laser pulse.
Described power amplifier is comprised of one or several fiber amplifier level, wherein each fiber amplifier level comprises: an optical-fiber bundling device (4), the signal end inoculation component (1) of optical-fiber bundling device or the output of previous stage fiber amplifier level, the pumping termination pumping laser (10) of optical-fiber bundling device, the output of optical-fiber bundling device links to each other with gain fibre (large core diameter yb-doped double-clad fiber) (11).A welding fibre optic isolater (12) between every one-level fiber amplifier level.Afterbody fiber amplifier level output termination output optical fibre (13).
In the described power amplifier (2), the pumping laser of use (10) can be the semiconductor laser with tail optical fiber, and operation wavelength is 915 nanometers, 940 nanometers or 978 nanometers.Employed pumping laser (10) can also be ytterbium-doping optical fiber laser, adopts with the band pump mode large core diameter yb-doped double-clad fiber is carried out pumping.
In the described power amplifier (2), can adopt forward pumping mode (see figure 6) to the pumping of large core diameter yb-doped double-clad fiber, can also adopt backward pumping mode (see figure 7) or Direct/Reverse pump mode and use (see figure 8).
Described output optical fibre (13), output is molten the quartz glass end cap, is 8 degree and is coated with the flashlight antireflection film with tilt angle and at end face, to suppress self-oscillation.
We adopt this structure, the main oscillations level adopts the coupling fiber acousto-optic modulator, power output is 1 W, repetition rate 20-100 kHz is adjustable, pulse duration is ~ 100 ns during 20 kHz, and pulse duration is seen Fig. 9 for ~ 900 ns(during 100 kHz), through the two-stage fiber amplifier, average output power had reached more than 230 W when repetition rate was 100 kHz, and the pulse duration broadening is seen Figure 10 to ~ 1400 ns().
Claims (6)
1. high power pulse type ytterbium-doped all fibre laser is characterized in that: it comprises that master oscillator (1) and power amplifier (2) two parts form,
Described master oscillator is that a kind of use piezoelectric element (piezoelectric element) is as the Q adjusting optical fiber laser (see figure 2) of Q switched element, it comprises the pumping semiconductor laser (3) with tail optical fiber, its output tail optical fiber is connected in the pumping input port (4) of optical-fiber bundling device, the output optical fibre port of optical-fiber bundling device connects high reflective fine Bragg grating (5), the other end of grating (5) and yb-doped double-clad fiber (6) weld together, the other end of yb-doped double-clad fiber with write the low reflective fine Bragg grating (9) that is formed on the polarization maintaining optical fibre and weld mutually, be provided with modulation signal drive circuit (8) and piezoelectric element (7) between yb-doped double-clad fiber and low reflective fine Bragg grating (9), modulation signal drive circuit (8) is used for driving piezoelectric element (7) and periodically presses the chamber inner fiber with the polarization direction of light modulated, and low reflective fine Bragg grating (9) other end links to each other with the power amplifier signal input part; Or described master oscillator is a kind of Q adjusting optical fiber laser (see figure 3) take acousto-optic modulator or electrooptic modulator as Q switched element, it comprises the pumping semiconductor laser (3) with tail optical fiber, its output tail optical fiber is connected in the pumping input port (4) of optical-fiber bundling device, the output optical fibre port of optical-fiber bundling device connects high reflective fine Bragg grating (5), the other end of grating (5) and yb-doped double-clad fiber (6) weld together, the other end of yb-doped double-clad fiber is connected with coupling fiber acousto-optic modulator or electrooptic modulator (14), the modulator other end welds mutually with low reflective fine Bragg grating (9), and low reflective fine Bragg grating (9) other end links to each other with the power amplifier signal input part; Or described master oscillator is a kind of laser pulse (see figure 4) that obtains that the continuous type fiber laser is modulated, it comprises the pumping semiconductor laser (3) with tail optical fiber, its output tail optical fiber is connected in the pumping input port (4) of optical-fiber bundling device, the output optical fibre port of optical-fiber bundling device connects high reflective fine Bragg grating (5), the other end of grating (5) and yb-doped double-clad fiber (6) weld together, the other end of yb-doped double-clad fiber welds mutually with low reflective fine Bragg grating (9), low reflective fine Bragg grating (9) other end is connected with coupling fiber acousto-optic modulator or electrooptic modulator (14), and the modulator other end links to each other with the power amplifier signal input part; Or described master oscillator is a kind of gain switch with tail optical fiber (gain switch) type impulse semiconductor laser (see figure 5), it comprises electric pulse driver (15), wavelength is operated in the semiconductor laser with tail optical fiber (16) of 1um wave band, electric pulse driver output current pulsed drive semiconductor laser output laser pulse
The fiber amplifier that described power amplifier is comprised of one or several fiber amplifier level, wherein each fiber amplifier level comprises: an optical-fiber bundling device (4), the signal end inoculation component (1) of optical-fiber bundling device or the output of previous stage fiber amplifier level, the pumping termination pumping laser (10) of optical-fiber bundling device, the output of optical-fiber bundling device links to each other with gain fibre (large core diameter yb-doped double-clad fiber) (11), a welding fibre optic isolater (12) between each fiber amplifier level, afterbody fiber amplifier level output termination output optical fibre (13).
2. high power pulse type ytterbium-doped all fibre laser claimed in claim 1, its characteristics are, in the described power amplifier (2), the pumping laser (10) that uses can be the semiconductor laser with tail optical fiber, operation wavelength is 915 nanometers, 940 nanometers or 978 nanometers, employed pumping laser (10) can also be ytterbium-doping optical fiber laser, adopts with the band pump mode large core diameter yb-doped double-clad fiber is carried out pumping.
3. by high power pulse type ytterbium-doped all fibre laser claimed in claim 1, its characteristics are, in the described power amplifier (2), the forward pumping mode are adopted in the pumping of large core diameter yb-doped double-clad fiber.
4. by high power pulse type ytterbium-doped all fibre laser claimed in claim 1, its characteristics are, in the described power amplifier (2), the backward pumping mode are adopted in the pumping of large core diameter yb-doped double-clad fiber.
5. by high power pulse type ytterbium-doped all fibre laser claimed in claim 1, its characteristics are, in the described power amplifier (2), Direct/Reverse pump mode and usefulness are adopted in the pumping of large core diameter yb-doped double-clad fiber.
6. by high power pulse type ytterbium-doped all fibre laser claimed in claim 1, its characteristics are, described output optical fibre (13), output is molten the quartz glass end cap, is 8 degree and is coated with the self-oscillatory flashlight antireflection film of inhibition with tilt angle and at end face.
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| CN103944056A (en) * | 2014-04-02 | 2014-07-23 | 中国电子科技集团公司第二十六研究所 | Acoustic-optical Q pulse modulation optical fiber laser device of MOPA structure |
| CN104051939A (en) * | 2014-07-10 | 2014-09-17 | 广东量泽激光技术有限公司 | High-power microchip laser device |
| CN104092086A (en) * | 2014-06-18 | 2014-10-08 | 华南理工大学 | Super-narrow-linewidth single-frequency Q-switched pulse fiber laser |
| CN104362498A (en) * | 2014-11-20 | 2015-02-18 | 山东海富光子科技股份有限公司 | High-power single-mode 915-nm all-fiber laser |
| CN104362497A (en) * | 2014-11-20 | 2015-02-18 | 山东海富光子科技股份有限公司 | Single-frequency blue-green light source based on 930 nm single-frequency fiber laser unit |
| CN104409949A (en) * | 2014-11-05 | 2015-03-11 | 丹阳聚辰光电科技有限公司 | Ultra-short pulse fiber laser |
| CN104466638A (en) * | 2014-12-15 | 2015-03-25 | 山东海富光子科技股份有限公司 | Mechanical tuning Q system for optical fiber laser |
| CN106816806A (en) * | 2017-03-07 | 2017-06-09 | 深圳市杰普特光电股份有限公司 | Optical fiber laser |
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| CN107623246A (en) * | 2016-07-14 | 2018-01-23 | 中国兵器装备研究院 | Fibre core is the same as band pumped optical fibre laser |
| CN109167237A (en) * | 2018-10-22 | 2019-01-08 | 南京理工大学 | Inhibit the 8KW narrow cable and wide optical fiber laser and its construction method of nonlinear effect |
| CN109256662A (en) * | 2018-09-03 | 2019-01-22 | 华南理工大学 | Based on gain competition and with the L-band high power fiber laser with pumping |
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| CN112072453A (en) * | 2020-08-31 | 2020-12-11 | 山东森峰激光装备有限公司 | Reverse-pumping multistage-amplification continuous MOPA fiber laser and laser generation method |
| CN114883898A (en) * | 2022-05-24 | 2022-08-09 | 西安工业大学 | Array distributed high-power all-fiber laser amplifier |
| CN114883898B (en) * | 2022-05-24 | 2024-06-11 | 西安工业大学 | Array distributed high-power all-fiber laser amplifier |
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Application publication date: 20130417 |