CN103424882A - Combined beam aperture filling device based on inverse Dammann grating - Google Patents
Combined beam aperture filling device based on inverse Dammann grating Download PDFInfo
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- CN103424882A CN103424882A CN2013103906206A CN201310390620A CN103424882A CN 103424882 A CN103424882 A CN 103424882A CN 2013103906206 A CN2013103906206 A CN 2013103906206A CN 201310390620 A CN201310390620 A CN 201310390620A CN 103424882 A CN103424882 A CN 103424882A
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Abstract
A combined beam aperture filling device based on an inverse Dammann grating is composed of a laser emitting array, a Fourier transform lens and the inverse Dammann grating, wherein the laser emitting array, the Fourier transform lens and the inverse Dammann grating are in the same optical axis. A specific number of related laser beams with the same phase position are combined and filled to form a single laser beam, and the luminance of a laser system is greatly improved. The combined beam aperture filling device based on the inverse Dammann grating has the advantages of being simple in structure, high in efficiency, low in cost, stable, reliable and the like.
Description
Technical field
The present invention relates to a kind of high brightness laser system, particularly a kind of coherent laser array based on contrary Darman raster closes the 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 field, to power and the more and more higher requirement of brightness proposition of laser system.Except the output power and brightness of making great efforts the single laser instrument of raising, the relevant bundle technology of closing of use can be consistent by the locking of the phase place of a plurality of laser emission elements, and on target face, the formation interference is strengthened, and greatly improves the light intensity at central peak place.But common relevant synthetic technology output facula is attended by secondary lobe, has wasted a part of power.
In order to address this problem, formerly technology [1] (is closed the beam orifice filling device referring to the coherent array laser inverse Darman raster, patent of invention, Granted publication number: CN 101592783 B) in, utilize contrary Darman raster light field to the coherent laser emission array on the frequency plane of fourier lense to carry out phase compensation, realize the bundle that closes of multiple coherent laser, eliminate secondary lobe, improve the brightness of closing light beams.But in this scheme, the difficulty of processing of spectrum distribution phase plate is very high, the machining precision error efficiency that often bundle is closed in impact.
Summary of the invention
The object of the invention is to overcome the problem that above-mentioned first technology exists, provide a kind of coherent laser array based on contrary Darman raster to close the beam orifice filling device, this device utilizes the contrary displacement of Darman raster on the frequency plane of lens to substitute the effect of spectrum distribution phase plate, realizes closing bundle.Have simple in structure, the advantage such as efficiency is high, and cost is low, reliable and stable.
The technology of the present invention solves principle: at first phase place is locked onto to consistent three or nine laser emission elements and is arranged in 1 * 3 or 3 * 3 equidistant array, the laser emitting direction all with the optical axis keeping parallelism of system.These coherent lasers to back focal plane, carry out phase compensation by contrary Darman raster to light field through lens focus, realize the bundle that closes of coherent laser array, realize the aperture filling simultaneously, greatly improve the far field beam brightness, and 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 contrary Darman raster closes the beam orifice filling device, its characteristics are: this device is successively by the coherent laser array of same optical axis, Fourier transform lens, contrary Darman raster forms, described contrary 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 comprised of three transmitter units or nine transmitter units, each transmitter unit all guarantees that the hot spot of output collimates output and parallel to each other, by three transmitter units, formed, alinement array equally spacedly, when being formed by nine transmitter units, line up equally spacedly the rectangular array of 3 * 3, 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 be not less than single transmitter unit maximum output facula diameter 95%, the total hot spot full illumination of described coherent laser array on the back focal plane of described Fourier transform lens is on the described contrary periodicity grating inscription face of Darman raster.
Technique effect of the present invention:
With first technology, compare, the present invention just can realize that without spectrum distribution phase plate the coherent laser array based on contrary Darman raster closes the beam orifice filling, structure is simpler, system is more stable, be subject to the impact of device mismachining tolerance less, can realize to close bundle efficiency higher, can realize the high brightness laser output of single light beam.
The accompanying drawing explanation
Fig. 1 is the index path that closes beam orifice filling device embodiment 1 that the present invention is based on contrary 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 that closes the beam orifice filling device 1 based on contrary Darman raster.As seen from the figure, the coherent laser array that the present invention is based on contrary Darman raster closes the beam orifice filling device, successively by the coherent laser array 1 of same optical axis, Fourier transform lens 2, contrary Darman raster 3 forms, described contrary 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 comprised of nine transmitter units, each transmitter unit all guarantees that the hot spot of output collimates output and parallel to each other, nine transmitter units are lined 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 be not less than single transmitter unit maximum output facula diameter 95%, 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 described contrary periodicity grating inscription face of Darman raster 3.
According to the Fourier transform theory, on the back focal plane of fourier lense 2, hot spot can present a kind of optical field distribution that contrary Darman raster phase fluctuation distributes that has.And contrary Darman raster 3 provides the phase place of a conjugation on back focal plane, see through the optical field distribution phase fluctuation afterwards of contrary Darman raster 3 and be eliminated, can obtain in far field the high brightness laser output of single main lobe.Concrete mathematical derivation can be with reference to technology [1] formerly.Because coherent laser array 1 is 1 * 3 or 3 * 3 arrangement mode, after the phase place locking is consistent, the PHASE DISTRIBUTION between mutually is arithmetic progression.Just, the PHASE DISTRIBUTION of different diffraction level time also is arithmetic progression after 1 * 3 or 3 * 3 Damman raster splitting beam, and the difference that may exist between two arithmetic progression can make up by the contrary Darman raster of translation, has substituted the effect of spectrum distribution phase plate.So, the coherent laser array formed for the given number transmitter unit, using contrary Darman raster to carry out the aperture filling does not need to compose the distribution phase plate.With technology formerly, compare, structure is simpler, and system is more stable, closes bundle efficiency higher.
Below 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 to three hot spot collimate in parallel the array of 1 * 3, mutually between interval 20mm.By a focal length, be 500mm, the Fourier transform lens that the clear aperature diameter is 80mm focuses on back focal plane.The phase place of three transmitter unit Output of lasers is carried out real-time lock by passive relevant synthetic method, remains on the back focal plane of Fourier transform lens phase place identical.The contrary Darman raster 3 that order of diffraction time is 1 * 3 is placed in the back focal plane of Fourier transform lens 2, and periodically to inscribe face vertical with optical axis for grating, is of a size of 10 * 10mm, larger than the spot diameter 108 μ m after focusing.The cycle of contrary Darman raster 3 is 26.707 μ m, and SPA sudden phase anomalies is o'clock at 0.735 place.After contrary Darman raster 3, output beam concentrates on zero level, realizes closing bundle, and closing bundle efficiency is 60%, and the power that closes the rear light beam of bundle has 18W, approaches the theoretical optimum efficiency 66% of 1 * 3 contrary Darman raster.
This embodiment shows, the present invention has simple in structure, and system stability closes bundle efficiency advantages of higher, just can realize the aperture filling of coherent laser array without spectrum distribution phase plate, is a kind of technology of acquisition high brightness laser system of having a bright future.
Claims (1)
1. the coherent laser array based on contrary Darman raster closes the beam orifice filling device, it is characterized in that: this device is successively by the coherent laser array (1) of same optical axis, Fourier transform lens (2), contrary Darman raster (3) forms, described contrary 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 comprised of three transmitter units or nine transmitter units, each transmitter unit all guarantees that the hot spot of output collimates output and parallel to each other, by three transmitter units, formed, alinement array equally spacedly, when being formed by nine transmitter units, line up equally spacedly the rectangular array of 3 * 3, 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 be not less than single transmitter unit maximum output facula diameter 95%, 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 described contrary periodicity grating inscription face of Darman raster (3).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112421357A (en) * | 2020-10-08 | 2021-02-26 | 武汉光谷航天三江激光产业技术研究院有限公司 | Frequency modulation type semiconductor seed source for high-power optical fiber laser |
| CN112636141A (en) * | 2020-12-18 | 2021-04-09 | 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 |
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| US20090296751A1 (en) * | 2007-01-26 | 2009-12-03 | Telaris Inc. | Electronically phase-locked laser systems |
| 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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| US20090296751A1 (en) * | 2007-01-26 | 2009-12-03 | Telaris Inc. | Electronically phase-locked laser systems |
| 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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| AIMIN YAN ETC.: "Simultaneous beam combination and aperture filling of coherent laser arrays by conjugate Dammann gratings", 《OPTICS LETTERS》, vol. 35, no. 8, 15 April 2010 (2010-04-15), pages 1251 - 1253, XP001553242, DOI: doi:10.1364/OL.35.001251 * |
| BING LI ETC.: "Simulations of conjugate Dammann grating based 2D coherent solid-state laser array combination", 《OPTICS COMMUNICATIONS》, 30 October 2012 (2012-10-30), pages 126 - 131 * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112421357A (en) * | 2020-10-08 | 2021-02-26 | 武汉光谷航天三江激光产业技术研究院有限公司 | Frequency modulation type semiconductor seed source for high-power optical fiber laser |
| CN112636141A (en) * | 2020-12-18 | 2021-04-09 | 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 |
| 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 |
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