CN103424882B - Based on the conjunction beam orifice filling device of inverse Darman raster - Google Patents
Based on the conjunction beam orifice filling device of inverse Darman raster Download PDFInfo
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- CN103424882B CN103424882B CN201310390620.6A CN201310390620A CN103424882B CN 103424882 B CN103424882 B CN 103424882B CN 201310390620 A CN201310390620 A CN 201310390620A CN 103424882 B CN103424882 B CN 103424882B
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Abstract
Coherent laser array based on inverse Darman raster closes a beam orifice filling device, is made up of the Laser emission array of same optical axis, Fourier transform lens and inverse Darman raster.The merging of the coherent laser of given number consistent for phase place is filled to single light beam by the present invention, increases substantially the brightness of laser system.The present invention has that structure is simple, efficiency is high, cost is low and the advantage such as reliable and stable.
Description
Technical field
The present invention relates to a kind of high brightness laser system, particularly a kind of coherent laser array based on inverse Darman raster closes beam orifice filling device.
Background technology
Along with development in science and technology and growth of the national economic, in industry manufacture and national defence, more and more higher requirement is proposed to the power of laser system and brightness.Except making great efforts to improve except the output power of single laser instrument and brightness, using coherently combined technology can be consistent by the PGC demodulation of multiple laser emission element, target face being formed interfere and strengthening, greatly improving the light intensity at central peak place.But common optics coherence tomography technology export hot spot is attended by secondary lobe, wastes a part of power.
In order to address this problem, (beam orifice filling device is closed see coherent array laser inverse Darman raster in first technology [1], patent of invention, Authorization Notice No.: CN101592783B) in utilize inverse Darman raster to carry out phase compensation to the light field of coherent laser emission array on the frequency plane of fourier lense, realize the conjunction bundle of multiple coherent laser, eliminate secondary lobe, improve the brightness of closing light beams.But the difficulty of processing of Spectral structure phase-plate is very high in the program, machining precision error often affects the efficiency of closing bundle.
Summary of the invention
The object of the invention is to overcome above-mentioned first technology Problems existing, a kind of coherent laser array based on inverse Darman raster is provided to close beam orifice filling device, this device utilizes the inverse displacement of Darman raster on the frequency plane of lens to carry out the effect of alternative Spectral structure phase-plate, realizes closing bundle.There is structure simple, the advantages such as efficiency is high, and cost is low, reliable and stable.
The technology of the present invention solves principle: first PGC demodulation is arranged in the equidistant array of 1 × 3 or 3 × 3 to consistent three or nine laser emission elements, laser emitting direction all with the optical axis keeping parallelism of system.These coherent lasers on back focal plane through lens focus, carry out phase compensation by inverse Darman raster to light field, realize the conjunction bundle of coherent laser array, and realize aperture simultaneously and fill, greatly improve far field beams brightness, total output beam bore can also change control.
The technology of the present invention solution is as follows:
A kind of coherent laser array based on inverse Darman raster closes beam orifice filling device, its feature is: this device is successively by the coherent laser array of same optical axis, Fourier transform lens, inverse Darman raster is formed, described inverse Darman raster periodically grating inscription face is vertical with optical axis, and be positioned on the back focal plane of described Fourier transform lens, described coherent laser array is made up of three transmitter units or nine transmitter units, each transmitter unit all guarantee export hot spot collimation export and parallel to each other, be made up of three transmitter units, then alinement array equally spacedly, when being made up of nine transmitter units, then line up the rectangular array of 3 × 3 equally spacedly, in all transmitter units, minimum single transmitter unit laser output power is not less than 95% of the highest single transmitter unit laser output power, and the minimum output facula diameter of single transmitter unit is not less than 95% of the maximum output facula diameter of single transmitter unit, the total hot spot full illumination of described coherent laser array on the back focal plane of described Fourier transform lens is on the periodicity grating inscription face of described inverse Darman raster.
Technique effect of the present invention:
Compared with first technology, the present invention just can realize closing beam orifice based on the coherent laser array of inverse Darman raster without the need to Spectral structure phase-plate and fill, structure is simpler, system is more stable, impact by device mismachining tolerance is less, the conjunction bundle efficiency that can realize is higher, and the high brightness laser that can realize single light beam exports.
Accompanying drawing explanation
Fig. 1 is the index path of the conjunction beam orifice filling device embodiment 1 that the present invention is based on inverse Darman raster.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the invention will be further described, but should not limit the scope of the invention with this.
First refer to Fig. 1, Fig. 1 is the structural representation of the embodiment 1 based on the conjunction beam orifice filling device against Darman raster.As seen from the figure, the coherent laser array that the present invention is based on inverse Darman raster closes beam orifice filling device, successively by the coherent laser array 1 of same optical axis, Fourier transform lens 2, inverse Darman raster 3 is formed, described inverse Darman raster 3 periodically grating inscription face is vertical with optical axis, and be positioned on the back focal plane of described Fourier transform lens 2, described coherent laser array 1 is made up of nine transmitter units, each transmitter unit all guarantee export hot spot collimation export and parallel to each other, nine transmitter units line up the rectangular array of 3 × 3 equally spacedly, in all transmitter units, minimum single transmitter unit laser output power is not less than 95% of the highest single transmitter unit laser output power, the minimum output facula diameter of single transmitter unit is not less than 95% of the maximum output facula diameter of single transmitter unit, the total hot spot of described coherent laser array 1 on the back focal plane of described Fourier transform lens 2 needs full illumination on the periodicity grating inscription face of described inverse Darman raster 3.
Theoretical according to Fourier transform, on the back focal plane of fourier lense 2, hot spot can present a kind of optical field distribution with inverse Darman raster phase fluctuation distribution.And inverse Darman raster 3 provides the phase place of a conjugation on back focal plane, be then eliminated through the optical field distribution phase fluctuation after inverse Darman raster 3, the high brightness laser that can obtain single main lobe in far field exports.Concrete mathematical derivation can with reference in first technology [1].Due to the arrangement mode that coherent laser array 1 is 1 × 3 or 3 × 3, after PGC demodulation is consistent, the PHASE DISTRIBUTION is mutually arithmetic progression.Just, the PHASE DISTRIBUTION that after the Damman raster splitting beam of 1 × 3 or 3 × 3, different diffraction level is secondary is also in arithmetic progression, and the difference that may exist between two arithmetic progression can be made up against Darman raster by translation, instead of the effect of Spectral structure phase-plate.So for the coherent laser array of given number transmitter unit composition, using inverse Darman raster to carry out aperture filling does not need Spectral structure phase-plate.With compared with first technology, structure is simpler, and system is more stable, and conjunction bundle efficiency is higher.
Here is formation and the correlation parameter of the embodiment of the present invention 2:
Use three fiber amplifier links as laser emission element, each link output power is 10W, and optical maser wavelength is 1064nm, and output facula is Gauss's hot spot, and beam waist diameter is 12mm.Be arranged into three hot spot collimate in parallel the array of 1 × 3, interval 20mm mutually.Be 500mm by a focal length, clear aperture diameter is that the Fourier transform lens of 80mm focuses on back focal plane.The phase place of three transmitter unit Output of lasers carries out real-time lock by the method for passive optics coherence tomography, and on the back focal plane remaining on Fourier transform lens, phase place is identical.Order of diffraction time be 1 × 3 inverse Darman raster 3 be placed in the back focal plane of Fourier transform lens 2, periodically to inscribe face vertical with optical axis for grating, is of a size of 10 × 10mm, than the spot diameter 108 μm after focusing greatly.The cycle of inverse Darman raster 3 is 26.707 μm, and SPA sudden phase anomalies is o'clock at 0.735 place.After inverse Darman raster 3, output beam concentrates on zero level, realizes closing bundle, and closing bundle efficiency is 60%, and after namely closing bundle, the power of light beam has 18W, close to 1 × 3 against the theoretical optimum efficiency 66% of Darman raster.
This embodiment shows, it is simple that the present invention has structure, system stability, and close bundle efficiency advantages of higher, the aperture that just can realize coherent laser array without the need to Spectral structure phase-plate is filled, and is a kind of technology of acquisition high brightness laser system of having a bright future.
Claims (1)
1. one kind is closed beam orifice filling device based on the coherent laser array of inverse Darman raster, it is characterized in that: this device is successively by the coherent laser array (1) that optical axis is parallel to each other, Fourier transform lens (2), inverse Darman raster (3) is formed, described inverse Darman raster (3) periodically grating inscription face is vertical with optical axis, and be positioned on the back focal plane of described Fourier transform lens (2), described coherent laser array (1) is made up of three transmitter units or nine transmitter units, each transmitter unit all guarantee export hot spot collimation export and parallel to each other, be made up of three transmitter units, then alinement array equally spacedly, when being made up of nine transmitter units, then line up the rectangular array of 3 × 3 equally spacedly, in all transmitter units, minimum single transmitter unit laser output power is not less than 95% of the highest single transmitter unit laser output power, and the minimum output facula diameter of single transmitter unit is not less than 95% of the maximum output facula diameter of single transmitter unit, the total hot spot full illumination of described coherent laser array (1) on the back focal plane of described Fourier transform lens (2) is on the periodicity grating inscription face of described inverse Darman raster (3),
Described coherent laser array (1) is phase-locked coherent laser array, and phase-locked after, the PHASE DISTRIBUTION between each laser is arithmetic progression.
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| CN201310390620.6A CN103424882B (en) | 2013-08-30 | 2013-08-30 | Based on the conjunction beam orifice filling device of inverse Darman raster |
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| CN112636141B (en) * | 2020-12-18 | 2022-05-31 | 中国工程物理研究院上海激光等离子体研究所 | Self-adaptive spectrum synthesis system |
Citations (1)
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| CN103151697A (en) * | 2013-03-15 | 2013-06-12 | 中国科学院上海光学精密机械研究所 | Solid laser parallel amplifier based on dammann grating |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103151697A (en) * | 2013-03-15 | 2013-06-12 | 中国科学院上海光学精密机械研究所 | Solid laser parallel amplifier based on dammann grating |
Non-Patent Citations (6)
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| Simulations of conjugate Dammann grating based 2D coherent solid-state laser array combination;Bing Li etc.;《Optics Communications》;20121030;126-131 * |
| Simultaneous beam combination and aperture filling of coherent laser arrays by conjugate Dammann gratings;Aimin Yan etc.;《OPTICS LETTERS》;20100415;第35卷(第8期);1251-1253 * |
| 二维固体激光阵列逆达曼光栅相干合束技术模拟研究;李兵等;《光学学报》;20121130;第32卷(第11期);1128004-1至1128004-6 * |
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