CN103633548A - Spectrum pulse beam-combining fiber laser device based on volume Bragg gratings - Google Patents
Spectrum pulse beam-combining fiber laser device based on volume Bragg gratings Download PDFInfo
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- CN103633548A CN103633548A CN201310677987.6A CN201310677987A CN103633548A CN 103633548 A CN103633548 A CN 103633548A CN 201310677987 A CN201310677987 A CN 201310677987A CN 103633548 A CN103633548 A CN 103633548A
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Abstract
The invention discloses a spectrum pulse beam-combining fiber laser device based on volume Bragg gratings. The beam-combining fiber laser device is characterized in that multiple pulse fiber laser beams are effectively combined by utilizing the volume Bragg grating, and high-energy laser output under different repetition frequencies can be realized by means of controlling the output energy and repetition frequency of each fiber laser device. The beam-combining fiber laser device comprises (1) multiple fiber laser devices each of which is internally provided with a pulse synchronization control circuit so as to realize the time-domain synchronization output of multiple pulses, and (2) volume Bragg gratings and laser outputs with the same amount as the fiber laser devices, wherein the laser pulses sent by all the fiber laser devices are subjected to time-domain synchronization and then respectively diffracted by all Bragg gratings so as to be combined into one laser beam to be output. By the beam-combining fiber laser device, multiple pulse fiber laser beams can be effectively combined, and the output of high-energy combined pulse fiber laser beams can be realized by means of selecting the output power and repetition frequency of pulse fiber lasers; the beam-combining fiber laser device is simple in structure, high in beam combining efficiency, stable, reliable, and suitable for practical application.
Description
Technical field
The present invention relates to a kind of fiber laser technology field, be specifically related to a kind of spectrum pulse based on Volume Bragg grating by the synthetic a branch of high energy pulse laser beam of multi beam pulse laser beam and close bundle fiber laser.
Background technology
Fiber laser is to take the laser that the optical fiber of doped with rare-earth elements is gain media, by the different rare earth element that adulterates, as bait (Er), ytterbium (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 laser work threshold value, energy transformation ratio is high, output beam quality is good, compact conformation is stable, without light path adjustment, perfect heat-dissipating, the distinguishing features such as life-span length and Maintenance free, therefore be rapidly developed and application widely.
Separate unit pulse optical fiber is realized high power, high light beam quality, high efficiency output the limit, because energy raises, and the raising that the nonlinear effect that the SBS of take is representative can Limited Pulses laser energy.Realizing more high-octane output optimal path is exactly light beam synthetic technology.
Multiple beam synthesizes relevant synthetic and two kinds of methods of Incoherent beam combining.Relevant synthesizing is to be controlled the output phase of multi-station laser is consistent by fine phase, each light beam increases and is multiplied with synthetic number because coherent superposition makes power and brightness, but relevant composite structure is complicated, be difficult for regulating, be not suitable for being applied in industrialization fiber laser product.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, propose a kind of by by the laser of a plurality of different wave lengths near field or the far field synthetic spectrum pulse based on Volume Bragg grating of stack that obtains optical field distribution close bundle fiber laser.
The present invention is realized by the following technical programs.
Bundle fiber laser is closed in a kind of spectrum pulse based on Volume Bragg grating, it is characterized in that using Volume Bragg grating effectively to close bundle to multiple beams of optical fiber laser, use pulse synchronization circuit to control multiple beams of optical fiber laser signal synchronous, by selecting output energy and the synchronous signal frequency of optical-fiber laser, realize high-energy and close bundle of pulsed laser power stage, comprise: pulse optical fiber 1, pulse optical fiber 2 is to pulse optical fiber n, Volume Bragg grating 11, Volume Bragg grating 12 is to Volume Bragg grating 1n and pulse laser output, pulse optical fiber 1, pulse optical fiber 2 passes through respectively Volume Bragg grating 11 separately to pulse optical fiber n, Volume Bragg grating 12 is to Volume Bragg grating 1n diffraction, be combined into a bundle of pulsed laser output 10, each pulse optical fiber is when providing light pulse signal, synchronous electric signal is exported for external sync circuit 20 and is controlled by interface, to realize impulsive synchronization output.
Described pulse optical fiber 1 ~ n, is ytterbium-doping optical fiber laser, built-in synchronization pulse circuit, central wavelength lambda
1~ λ
nin 1.06-1.1 μ m, 3dB live width is less than 1nm, laser beam datum output, and fan-out capability and repetition rate are adjustable.
Described n platform pulse optical fiber (1 ~ n) central wavelength lambda
1~ λ
nuniformly-spaced, wavelength spacing is greater than 3nm.
Described Volume Bragg grating 11,1 output of paired pulses fiber laser is high anti-, and high anti-spectral regions three dB bandwidth is 1.5nm, and diffraction efficiency is greater than 99%.
Described Volume Bragg grating 1k(1<k≤n), paired pulses fiber laser k output is high anti-, and high anti-spectral regions three dB bandwidth is 1.5nm, and diffraction efficiency is greater than 99%; Paired pulses fiber laser k-1, pulse optical fiber k-2 ..., pulse optical fiber 1 is thoroughly high, transmissivity is greater than 99%.
Described Volume Bragg grating 11 ~ 1n, the maximum power that all can bear pulse optical fiber 1 ~ n.
Described external sync circuit is connected with n platform pulse optical fiber (1 ~ n) inner synchronousing signal, by changing external circuit triggering signal frequency, can to n platform pulse optical fiber repetition rate, adjust simultaneously, guarantee each pulse optical fiber pulse Domain Synchronous output.
The invention has the advantages that it,, by multi beam pulse optical fiber output is effectively closed to bundle, has obtained the output of high-energy optical fiber pulse laser, whole system is simple in structure, close bundle efficiency high, reliable and stable, be applicable to practical application.
Accompanying drawing explanation
Fig. 1 is a kind of structure chart diagram of the present invention.
Mark in figure: pulse optical fiber 1, pulse optical fiber 2, pulse optical fiber n, Volume Bragg grating 11, Volume Bragg grating 12, Volume Bragg grating 1n, pulse laser output 10, external sync circuit 20.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 1, a kind of spectrum based on Volume Bragg grating closes beam pulse fiber laser, it is characterized in that, comprise: pulse optical fiber 1, pulse optical fiber 2, pulse optical fiber n, Volume Bragg grating 11, Volume Bragg grating 12, Volume Bragg grating 1n, pulse laser output 10, external sync circuit 20, pulse optical fiber 1, pulse optical fiber 2, Volume Bragg grating 11 is passed through respectively in the output of pulse optical fiber n separately, Volume Bragg grating 12, Volume Bragg grating 1n diffraction, be combined into beam of laser output 10, by external sync circuit 20, make n bundle optical-fiber laser output pulse Domain Synchronous and by closing bundle, realize high energy laser pulse output.
Described pulse optical fiber 1 is ytterbium-doping optical fiber laser, built-in synchronization pulse circuit, central wavelength lambda
1in 1.06-1.1 μ m, 3dB live width is less than 1nm, laser beam datum output, and fan-out capability and repetition rate are adjustable;
Described pulse optical fiber 2 is ytterbium-doping optical fiber laser, built-in synchronization pulse circuit, central wavelength lambda
2in 1.06-1.1 μ m, 3dB live width is less than 1nm, laser beam datum output, and output energy and repetition rate are adjustable;
Described pulse optical fiber n is ytterbium-doping optical fiber laser, built-in synchronization pulse circuit, central wavelength lambda
nin 1.06-1.1 μ m, 3dB live width is less than 1nm, laser beam datum output, and fan-out capability and repetition rate are adjustable;
Described n platform pulse optical fiber (1 ~ n) central wavelength lambda
1~ λ
nuniformly-spaced, wavelength spacing is greater than 3nm;
Described Volume Bragg grating 11,1 output of paired pulses fiber laser is high anti-, and high anti-spectral regions three dB bandwidth is 1.5nm, and diffraction efficiency is greater than 99%.
Described Volume Bragg grating 12,2 outputs of paired pulses fiber laser are high anti-, and high anti-spectral regions three dB bandwidth is 1.5nm, and diffraction efficiency is greater than 99%; Paired pulses fiber laser 1 is thoroughly high, and transmissivity is greater than 99%.。
Described Volume Bragg grating 1n paired pulses fiber laser n output is high anti-, and high anti-spectral regions three dB bandwidth is 1.5nm, and diffraction efficiency is greater than 99%; Paired pulses fiber laser n-1, pulse optical fiber n-2 ..., pulse optical fiber 2, pulse optical fiber 1 be thoroughly high, transmissivity is greater than 99%.
Described Volume Bragg grating 11 ~ 1n, the maximum power that all can bear pulse optical fiber 1 ~ n.
Described external sync circuit 20 is connected with n platform pulse optical fiber (1 ~ n) inner synchronousing signal, by changing external circuit triggering signal frequency, can to n platform pulse optical fiber repetition rate, adjust simultaneously, guarantee each pulse optical fiber pulse Domain Synchronous output.
Claims (8)
1. bundle fiber laser is closed in the spectrum pulse based on Volume Bragg grating, it is characterized in that using Volume Bragg grating effectively to close bundle to multiple beams of optical fiber laser, use pulse synchronization circuit to control multiple beams of optical fiber laser signal synchronous, by selecting output energy and the synchronous signal frequency of optical-fiber laser, realize high-energy and close bundle of pulsed laser power stage, comprise pulse optical fiber (1), pulse optical fiber (2), pulse optical fiber (n), Volume Bragg grating (11), Volume Bragg grating (12), Volume Bragg grating (1n) and Laser output, each pulse optical fiber is respectively after each Volume Bragg grating diffraction, be combined into beam of laser pulse output.
2. bundle fiber laser is closed in the spectrum pulse based on Volume Bragg grating according to claim 1, it is characterized in that described pulse optical fiber (1), pulse optical fiber (2) ..., pulse optical fiber (n) is for mixing ytterbium pulse optical fiber, central wavelength lambda is in 1.06-1.1 μ m, 3dB live width is less than 1nm, laser beam datum output.
3. according to the spectrum pulse based on Volume Bragg grating described in claim 2, close bundle fiber laser, it is characterized in that built-in pulse synchronization circuit, when providing light pulse signal, synchronous electric signal is exported for external signal Synchronization Control by interface.
4. bundle fiber laser is closed in the spectrum pulse based on Volume Bragg grating according to claim 2, it is characterized in that n platform fiber laser central wavelength lambda
1, λ
2..., λ
nuniformly-spaced, wavelength spacing is greater than 3nm.
5. bundle fiber laser is closed in the spectrum pulse based on Volume Bragg grating according to claim 1, it is characterized in that the light beam repetition rate after synthesizing equals the repetition rate of incident laser.
6. bundle fiber laser is closed in the spectrum pulse based on Volume Bragg grating according to claim 1, it is characterized in that Volume Bragg grating (11) paired pulses fiber laser (1) output is high anti-, high anti-spectral regions three dB bandwidth is 1.5nm, and diffraction efficiency is greater than 99%.
7. bundle fiber laser is closed in the spectrum pulse based on Volume Bragg grating according to claim 1, it is characterized in that Volume Bragg grating 1k(1<k≤n), Bragg grating 1k paired pulses fiber laser k output is high anti-, high anti-spectral regions three dB bandwidth is 1.5nm, and diffraction efficiency is greater than 99%; Paired pulses fiber laser k-1, pulse optical fiber k-2 ..., pulse optical fiber 1 is thoroughly high, transmissivity is greater than 99%.
8. bundle fiber laser is closed in the spectrum pulse based on Volume Bragg grating according to claim 1, it is characterized in that Volume Bragg grating 11 ~ 1n, and n Volume Bragg grating all can bear the power of pulse optical fiber 1 ~ n.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104577692A (en) * | 2014-12-29 | 2015-04-29 | 北京航天控制仪器研究所 | Frequency spectrum beam combining device for frequency selection of fiber grating |
| CN104901149A (en) * | 2015-05-05 | 2015-09-09 | 中国科学院上海光学精密机械研究所 | Spectral beam combining system based on three diffraction gratings |
| CN107991781A (en) * | 2018-01-08 | 2018-05-04 | 广东省智能机器人研究院 | A kind of method that optical fiber output laser facula inhomogeneities is eliminated using spectrum beam combination |
| CN112202041A (en) * | 2020-10-12 | 2021-01-08 | 中国人民解放军军事科学院国防科技创新研究院 | Pulse fiber laser and working method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104577692A (en) * | 2014-12-29 | 2015-04-29 | 北京航天控制仪器研究所 | Frequency spectrum beam combining device for frequency selection of fiber grating |
| CN104577692B (en) * | 2014-12-29 | 2018-10-09 | 北京航天控制仪器研究所 | A kind of frequency spectrum beam merging apparatus of Frequency Selecting by Fiber Bragg Grating |
| CN104901149A (en) * | 2015-05-05 | 2015-09-09 | 中国科学院上海光学精密机械研究所 | Spectral beam combining system based on three diffraction gratings |
| CN107991781A (en) * | 2018-01-08 | 2018-05-04 | 广东省智能机器人研究院 | A kind of method that optical fiber output laser facula inhomogeneities is eliminated using spectrum beam combination |
| CN112202041A (en) * | 2020-10-12 | 2021-01-08 | 中国人民解放军军事科学院国防科技创新研究院 | Pulse fiber laser and working method |
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Application publication date: 20140312 |