CN211320559U - Fractal-based coherent fiber laser array and generation system thereof - Google Patents
Fractal-based coherent fiber laser array and generation system thereof Download PDFInfo
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- CN211320559U CN211320559U CN202020260310.8U CN202020260310U CN211320559U CN 211320559 U CN211320559 U CN 211320559U CN 202020260310 U CN202020260310 U CN 202020260310U CN 211320559 U CN211320559 U CN 211320559U
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Abstract
The coherent fiber laser array comprises N circles of light beams which are annularly arranged from inside to outside around the center of an array fiber, each circle of light beam comprises the same number of sub-light beams, and each sub-light beam in the same circle of light beam has the same optical parameter and is uniformly arranged along an angular direction. At least two or more continuous light beams in the N circles of light beams form a fractal arrangement laser array; in any two adjacent circles of light beams in the fractal distribution laser array, the beam waist radius, the beam caliber and the distance between the beam center and the array fiber center of each sub-light beam in the circle of light beams close to the inner side are reduced in equal ratio to the beam waist radius, the beam caliber and the distance between the beam center and the array fiber center of each sub-light beam in the circle of light beams close to the outer side. The array filling mode of the system can be expanded, and the optical parameter regulation and control capability of the laser array is improved, so that the synthesis efficiency and the mode purity of the structured light generated by the coherent fiber laser array are improved.
Description
Technical Field
The utility model relates to a coherent synthesis technical field of fiber laser especially relates to a coherent fiber laser array based on fractal and production system thereof.
Background
The fiber laser coherent synthesis is one of the important methods for obtaining high-brightness laser coherent synthesis, has wide application prospects in the fields of space optical communication, scientific research, national defense and the like, and is a research hotspot in the current laser technical field. The coherent synthesis of the fiber laser is an effective way to realize the laser output with high average power and high beam quality, and has wide application prospect in the fields of medical treatment and health, industrial processing, scientific research, national defense safety and the like. In recent years, with the rapid development of laser technology, not only high-power laser is required in the fields of long-distance space optical communication, nonlinear frequency conversion, laser ablation, material processing and the like, but also further requirements are provided for the amplitude, phase and polarization state space structures of optical fields, such as vortex beams, column vector beams, non-diffraction beams and the like, the optical fields with special space structures of optical parameters are collectively called as structure optical fields, and the coherent synthesis of fiber laser arrays also provides an effective technical approach for generating high-power structured light.
In the fiber laser array coherent combining technology, the construction of array beams directly influences the coherent combining effect. In the prior art, a regular hexagon or circular arrangement mode is generally adopted, the calibers of all light beams are the same, and the distances between adjacent light beams are consistent and are unit distances R. Referring to fig. 1, taking a circular uniformly-arranged laser array as an example, the 1 st circle of light beams in the uniformly-arranged laser array is the innermost circle of light beams, and the 1 st circle of light beams and the 2 nd circle of light beams … are sequentially arranged from inside to outside. The existing uniform array beam construction method is as shown in fig. 1, firstly constructing a unit beam at the origin of a cartesian coordinate system with a beam waist radius of w0The wavelength is lambda, the aperture of the light beam is d, then N circles of annularly arranged light beams are sequentially constructed from inside to outside, wherein the Nth circle comprises 6N sub-light beams which are the same as the unit light beam at the origin, all the sub-light beams are uniformly arranged along the angular direction, namely, one sub-light beam is arranged at intervals of pi/3N from 0 to 2 pi, and the distance between the center of each sub-light beam and the origin of the Nth circle is RNR is unit spacing. The circular laser array including N circles of circularly arranged beams constructed according to the method of fig. 1 has a total aperture D1: d1＝2NR+d。
However, the existing array beam construction method limits the filling mode of the array beam in the field of traditional coherent synthesis, so that the side lobe of the synthesized beam is difficult to further eliminate, and the improvement of the energy concentration degree of the synthesized beam is influenced. The problem is more obvious in the field of high-power structured light generated by a fiber laser array, for example, vortex beams are generated, the side lobe of a synthesized beam is difficult to further eliminate by the existing array beam construction method, so that the limitation of power improvement is influenced, and the mode purity of the generated vortex beams is influenced. Therefore, the existing array beam construction method brings difficulty to further optimization of the fiber laser array coherent combination system.
SUMMERY OF THE UTILITY MODEL
To the defect that exists among the prior art, the utility model provides a coherent fiber laser array and production system based on fractal, adopt this the utility model discloses can extend the array filling mode of system, and can promote the optical parameter regulation and control ability of laser array to can promote coherent fiber laser array and produce the synthetic efficiency of structured light and produce the mode purity of structured light.
In order to achieve the technical purpose, the utility model discloses a specific technical scheme as follows:
the fractal-based coherent fiber laser array comprises N circles of light beams which are annularly arranged around the center of the array fiber from inside to outside, wherein each circle of light beam comprises the same number of sub-light beams, and each sub-light beam in the same circle of light beam has the same optical parameter and is uniformly arranged along an angular direction.
At least two or more continuous light beams in the N circles of light beams form a fractal arrangement laser array; in any two adjacent circles of light beams in the fractal arrangement laser array, the beam waist radius, the beam caliber and the distance between the beam center and the array optical fiber center of each sub-light beam in the circle of light beams close to the inner side are reduced in equal ratio relative to the beam waist radius, the beam caliber and the distance between the beam center and the array optical fiber center of each sub-light beam in the circle of light beams close to the outer side, wherein the equal ratio of reduction is t, and t is more than 0.
Further, fractal arrangement laser array in the 1 st circle light beam be outmost round light beam, by outer 1 st circle light beam, 2 nd circle light beam … in proper order to interior. The proportion t of geometric scale reduction of any adjacent n-1 th light beam and n-th light beam in the fractal arrangement laser array is not more than rn/rn-1Wherein r isn-1Is the distance between the beam center of each sub-beam in the n-1 th beam and the center of the array fiber, rnThe distance between the beam center of each sub-beam in the nth beam and the center of the array fiber.
Further, in the present invention, rnAnd rn-1And the geometric series general formula is satisfied.
Further, the utility model discloses still including evenly arranging the laser array, have in the N circle light beam continuous two circles or the light beam more than two circles at least to constitute evenly to arrange the laser array.
Further, the utility model discloses in, the beam waist radius of all sub-beams in the laser array of evenly arranging is w0The wavelengths are lambda, the beam apertures are d, and the distances between adjacent rings of beams in the uniformly distributed laser array are the same.
Further, the utility model discloses in, fractal arrangement laser array and the even laser array that arranges set up in turn.
Further, the utility model discloses in, coherent fiber laser array wholly is regular hexagon or circular arranging.
The method for generating the fractal-based coherent fiber laser array comprises the following steps:
generating a laser beam;
amplifying the generated laser beam;
expanding the amplified laser beams to generate multiple paths of laser beams and amplifying the generated multiple paths of laser beams;
carrying out phase regulation and control on each path of amplified laser beams;
a plurality of fiber laser collimators are spliced in a fractal arrangement mode to form a fractal-based beam collimator array, each path of light beam after phase regulation corresponds to one fiber laser collimator in the beam collimator array one by one, each path of light beam after phase regulation is emitted through the beam collimator array, beam expansion and collimation of laser from fiber waveguide to free space light beam are realized, and meanwhile, splicing of the fractal-based coherent fiber laser array light beam is realized.
The utility model provides a coherent fiber laser array produces system based on fractal, coherent fiber laser array produces device based on fractal can produce any kind of above-mentioned coherent fiber laser array based on fractal.
Further, the utility model provides a coherent fiber laser array produces system based on fractal, including seed source, pre-amplification module, beam splitter module, cascade amplification module, phase modulator array and collimation and beam combining module. The seed source is used for generating laser beams, the laser beams output by the seed source seeds are amplified through the pre-amplification module and then enter the beam splitter module for beam expansion, and multiple paths of laser beams are generated; and the multi-path laser beams split by the beam splitter module are amplified by the cascade amplification module, and the amplified laser beams are injected into the phase modulator array for phase regulation and control. And each path of laser beam regulated and controlled by the phase modulator array is output to a collimation and beam combination module, and each path of laser beam is collimated and output by the collimation and beam combination module and spliced into a coherent fiber laser array beam based on fractal. The collimating and beam combining module comprises a plurality of fiber laser collimators, each path of laser beam corresponds to one fiber laser collimator, the fiber laser collimators of multiple paths of beams are spliced in a fractal arrangement mode (namely the fiber laser collimators are arranged according to the arrangement mode of the corresponding fractal arrangement laser arrays) to form a fractal-based beam collimator array, and the beam is emitted through the beam collimator array, so that beam expansion and collimation of laser from a fiber waveguide to a free space beam can be realized, and meanwhile, splicing of the fractal-based coherent fiber laser array beam can be realized.
Further, the device also comprises a composite beam processing module, a photoelectric detection module and a control system; part of light beams of the coherent fiber laser array light beam based on fractal output by the collimation and beam combination module after passing through the combined light beam processing module are incident to the photoelectric detection module. The photoelectric detection module converts the received optical signals into electric signals and transmits the electric signals to the control system. The control system generates a phase control signal according to the received electric signal and transmits the phase control signal to the phase modulator array, so that the locking and the regulation of the phase between each path of light beam are realized. The synthetic light beam processing module consists of a high reflector, a focusing lens and a beam splitter and has the functions of extracting light field information of the synthetic light beam and observing light intensity distribution of the synthetic light beam. The light beams output by the collimation and beam combination module pass through the high reflector, the high reflector reflects most energy light beams and transmits the energy light beams in a free space, the light beams containing a small part of energy are transmitted, the transmitted light beams containing the small part of energy pass through the focusing lens and then are split by the beam splitter, one part of light beams are focused to the photoelectric detector for extracting light field information, and the other part of light beams are focused to the light spot analyzer for observing the light intensity distribution of the combined light beams.
The utility model has the advantages as follows:
1. the utility model discloses guaranteed that the quantity of the sub-beam in every circle of annular arrangement beam is unanimous, solved current even array beam construction method and produced the lower not enough of vortex beam purity.
2. The utility model discloses compare with the laser array of evenly arranging, can fill more ways of sub-beam in the same bore, have the potentiality that power promoted.
3. The fractal array laser array is compatible with the uniform array laser array, can be combined with the uniform array laser array, and flexibly regulates and controls the light beam optical field distribution of the emitting area array in practical engineering application.
Drawings
FIG. 1 is a schematic view of a circular array beam;
fig. 2 is a schematic structural diagram of embodiment 1 of the present invention;
fig. 3 is a schematic structural diagram of embodiment 2 of the present invention;
fig. 4 is a schematic structural diagram of embodiment 3 of the present invention;
fig. 5 is a light intensity distribution and phase distribution diagram of two circles of array light beams in uniform annular arrangement, one circle of array light beams in uniform annular arrangement and two circles of array light beams in fractal annular arrangement;
FIG. 6 is a focal plane light intensity distribution diagram of two circles of uniformly annularly arranged array light beams, one circle of uniformly annularly arranged array light beams and two circles of fractal annularly arranged array light beams;
fig. 7 is an OAM mode spectrum distribution diagram of focal planes of two circles of array beams uniformly and annularly arranged, one circle of array beams uniformly and annularly arranged, and two circles of fractal array beams annularly arranged.
Fig. 8 is an OAM mode spectrum distribution diagram of an effective part of a vortex light beam generated by two circles of array light beams uniformly and annularly arranged, one circle of array light beams uniformly and annularly arranged, and two circles of fractal array light beams focal planes.
Fig. 9 is a schematic structural diagram of a fractal-based coherent fiber laser array generation system according to an embodiment of the present invention.
Fig. 10 is a schematic structural diagram of a fractal-based coherent fiber laser array generation system according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Referring to fig. 2, fig. 2 is a schematic structural diagram of embodiment 1 of the present invention. A coherent fiber laser array based on fractal is distributed in the center, namely the center of an array fiber, and comprises N circles of light beams which are annularly distributed around the center of the array fiber from inside to outside, wherein each circle of light beam comprises the same number of sub-light beams, and each sub-light beam in the same circle of light beam has the same optical parameter and is uniformly distributed along the angular direction.
In the embodiment shown in fig. 2, N circles of light beams form a fractal arrangement laser array; in any two adjacent circles of light beams in fractal arrangement laser arrayThe beam waist radius, the beam caliber and the distance between the beam center and the center of the array fiber of each sub-beam in the circle of beams close to the inner side are reduced in equal ratio relative to the beam waist radius, the beam caliber and the distance between the beam center and the center of the array fiber of each sub-beam in the circle of beams close to the outer side, wherein the proportion of the equal ratio reduction is t, and t is larger than 0. In this embodiment, a circular fractal arrangement laser array of N circles of light beams is constructed according to the schematic diagram of circular uniformly arranged array light beams shown in fig. 1. According to the distance R between the center of the Nth circle of sub-beams and the origin in FIG. 1NAnd the distance R between the center of the N-1 th circle sub-beam and the originN-1Determining the fractal ratio t-R of the coherent fiber laser array based on fractal in the embodimentN-1/RNDue to RNThe proportional scaling of the geometric reduction in this example is calculated as t ═ NR (N-1)/N.
In the embodiment shown in fig. 2, the 1 st circle of light beams of the fractal distribution laser array is the outermost circle of light beams, and the 1 st circle and the 2 nd circle … nth circle of light beams are sequentially arranged from outside to inside. Each circle of light beams comprises 6N sub-light beams, and each sub-light beam in each circle of light beams is uniformly distributed along the angle direction, namely, one sub-light beam is distributed at intervals of pi/3N from 0 to 2 pi.
Given a unit interval R, the beam waist radius of each sub-beam in the 1 st circle of beams is set as w0The aperture of the light beam is d, and the distance between the center of each sub-light beam in the 1 st circle of light beam and the center of the array fiber is r1NR. The beam waist radius w of each sub-beam of the nth beam in the fractal arrangement laser arraynDiameter of light beam dnAnd the distance r between the center of each sub-beam and the center of the array fibernAre each tn- 1w0，tn-1d and tn-1NR。
Then, the center-to-center distance between the n +1 th circle sub-beam and the n th circle sub-beam at the same angular position is:
it can be seen that the sub-beams in the n +1 th circle of beams at the same angular position are fully spaced from the sub-beams in the n th circle of beamsEqui-proportional array general expression. In a coherent fiber laser array based on fractal, a circularly arranged laser array comprising n circles of annularly arranged light beams has a total caliber D when n approaches infinity2The calculation can be based on the superposition of the distances between the centers of the sub-beams at the same angular position in adjacent turns, as follows:
it can be seen that the total caliber D is obtained by corresponding calculation in example 1 shown in FIG. 22＝2r1And + d is 2NR + d, which is the same as the total aperture of the circularly uniformly arranged array beam shown in fig. 1. Therefore, when N approaches infinity, the sub-beams will cover the whole caliber and the number of the sub-beams (6N) of the circularly arranged laser array comprising N circles of annularly arranged beams constructed by the construction method of the fractal-based coherent fiber laser arraynApproaching infinity.
The laser array transmitting surface optical field distribution constructed according to the fractal-based coherent fiber laser array construction method is as follows:
wherein the content of the first and second substances,
x, y are the abscissa and ordinate of the emitting surface in the cartesian coordinate system, z is the transmission distance of the array beam, and k represents the ordinal number of each term in the summation formula.
The utility model provides a fractal-based coherent fiber laser array in fractal arrange laser array and evenly arrange the laser array can be compatible, can combine the fractal to arrange the laser array and evenly arrange two kinds of modes of laser array and construct the laser array according to the actual engineering needs. For example, under the application requirements of limited synthetic path number and determined synthetic aperture, the fractal loop number of the fractal-arranged laser array can be determined firstlynmaxConstructing fractal arrangement laser array, and then using nth ordermaxAnd constructing a uniformly-arranged laser array comprising the single-path light beam at the origin position and the N-1 circle of annular sub-light beams in the unfilled aperture by taking the parameters of the circle of sub-light beams as a reference. As shown in fig. 3, refer to fig. 3, which is a schematic structural diagram of embodiment 2 of the present invention. A coherent fiber laser array based on fractal comprises a laser array and a laser array, wherein the laser array is uniformly distributed, and the laser array is arranged outside the fractal array. Firstly, constructing a unit beam at the origin of a Cartesian coordinate system, wherein the beam waist radius of the unit beam is w0The wavelength is lambda, the aperture of the light beam is d, then an evenly-distributed laser array formed by n circles of annularly-distributed light beams is sequentially constructed from inside to outside, the nth circle of light beam is used as the outermost circle of light beam of the evenly-distributed laser array, and meanwhile, the nth circle of light beam is also the first circle of light beam of the fractal-distributed laser array. And a plurality of circles of light beams which are annularly arranged outwards from the nth circle form a fractal arrangement laser array.
Fig. 4 is a schematic structural diagram of embodiment 3 of the present invention; a coherent fiber laser array based on fractal comprises a uniformly distributed laser array and a fractal distributed laser array. Under the application requirements of limited synthetic path number and determined synthetic aperture, the array fiber can be constructed in an array fiber arrangement mode of uniformly arranging laser arrays inside and fractal-arranged laser arrays outside. The array fiber can also be constructed by adopting an array fiber arrangement mode of uniformly arranging the laser arrays inside and outside the fractal arrangement laser arrays. For different requirements in practical engineering application, the arrangement and construction of the array optical fiber can be realized by adopting a mode of alternately arranging the laser arrays with uniform arrangement and the laser arrays with fractal arrangement, as shown in fig. 4.
The following is given as an example of calculation of the present invention, and the technical effects of the present invention will be further described:
to generate a vortex beam with a topological charge number of 3, a uniform circular array comprising 2 turns, N, was constructed according to the present uniformly arrayed laser array construction shown in fig. 1, wherein: the parameters of the optical fiber laser aperture-dividing coherent synthesis system are the number of array units 19 and the waist radius w of the laser beam0＝1024mm, the beam diameter d 23mm, the unit pitch R25 mm, and the laser operating wavelength λ 1064 nm. On the basis, two circles of array beams uniformly and annularly arranged can be obtained by removing the unit beams at the origin, and the light intensity distribution and the phase distribution of the array beams are shown in the accompanying fig. 5(a) and fig. 5 (d); the unit light beam at the origin and the first 6 unit light beams arranged in a ring shape are removed to obtain a ring of array light beams arranged in a uniform ring shape, and the light intensity distribution and the phase distribution of the array light beams are shown in the accompanying fig. 5(b) and fig. 5 (e); get rid of the unit light beam that origin department unit light beam and first 6 way rings were arranged, adopt the utility model discloses coherent fiber laser array construction method based on the fractal can obtain n 2 rings of fractal ring array light beams of arranging, and its light intensity distribution and phase distribution see attached 5(c), and attached 5(f) is shown.
By placing a lens with a focal length of 20m behind the array beam, the far field characteristics of the array beam can be studied at the lens focal plane. And (3) obtaining the light field distribution of the array light beam transmitted to the lens focal plane through the lens by using an angular spectrum transmission method through numerical simulation. The light intensity distribution of the two circles of array light beams which are uniformly and annularly arranged, the light intensity distribution of the one circle of array light beams which are uniformly and annularly arranged and the two circles of array light beams which are fractal and annularly arranged on the focal plane of the lens are shown in the attached drawings 6(a), 6(b) and 6 (c). The calculation result shows that compared with two circles of array beams which are uniformly and annularly arranged and one circle of array beams which are uniformly and annularly arranged, the light energy distribution of the vortex light beams generated by the two circles of fractal and annularly arranged array beams on the focal plane of the lens is more concentrated. A first-order bright ring for generating a structured light field, namely an effective part for generating a vortex light beam, can be collected in a circular area with the focus as the center and the diameter of 0.95mm on the focal plane of the lens. Further the calculation result shows, to the even annular array light beam of arranging of two circles, the even annular array light beam of arranging of round and the array light beam of arranging of two circles fractal rings, the first-order bright ring power that gathers in the circular region and produce the structure light field accounts for than being 0.482, 0.427 and 0.501, it is visible the utility model discloses coherent fiber laser array construction method based on fractal not only can extend the way number of synthetic light beam, promotes the total power of synthetic laser, can also promote the effective partial power that produces the vortex light beam and account for than.
The OAM mode spectrum distribution of one circle of uniform annularly arranged array beams and two circles of fractal annularly arranged array beams at the lens focal plane is shown in fig. 7(a), fig. 7(b), and fig. 7 (c). The calculation result shows that the OAM +3 mode intensity ratio of the two circles of the array light beams which are uniformly and annularly arranged, the one circle of the array light beams which are uniformly and annularly arranged and the two circles of the fractal and annularly arranged array light beams which are transmitted to the lens focal plane optical field distribution is 0.617, 0.681 and 0.681, and the main factor influencing the OAM mode spectrum distribution is the density degree of the innermost circle array of the array light beams which are angularly arranged.
The OAM mode spectrum distribution of the effective part of the vortex optical beam generated by one circle of uniform circular array beam and two circles of fractal circular array beam at the lens focal plane is shown in fig. 8(a), fig. 8(b), and fig. 8 (c). The calculation result shows that the OAM +3 mode intensity ratio of the effective part of the two circles of uniform annular arrangement array light beams, the one circle of uniform annular arrangement array light beams and the two circles of fractal annular arrangement array light beams which are transmitted to the focal plane of the lens to generate the vortex light beams is 0.907, 0.995 and 0.997, and the OAM +3 mode intensity ratio of the effective part of the two circles of fractal annular arrangement array light beams distributed in the focal plane light field and the OAM +3 mode intensity ratio of the effective part of the vortex light beams have advantages.
Referring to fig. 9, the present embodiment provides a fractal-based coherent fiber laser array generation system, which includes a seed source 1, a pre-amplification module 2, a beam splitter module 3, a cascade amplification module 4, a phase modulator array 5, and a collimation and beam combination module 6. The seed source 1 is used for generating laser beams, the laser beams output by the seed source 1 are amplified through the pre-amplification module 2 and then enter the beam splitter module 3 for beam expansion, and multiple paths of laser beams are generated; the multi-path laser beams split by the beam splitter module 3 are amplified by the cascade amplification module 4, and the amplified laser beams are injected into the phase modulator array 5 for phase regulation. Each path of laser beam regulated and controlled by the phase modulator array 5 is output to the collimation and beam combination module 6, and each path of beam is collimated and output by the collimation and beam combination module 6 and spliced into a coherent fiber laser array beam based on fractal. The collimating and beam combining module comprises a plurality of fiber laser collimators, each path of laser beam corresponds to one fiber laser collimator, the fiber laser collimators of multiple paths of beams are spliced in a fractal arrangement mode (namely the fiber laser collimators are arranged according to the arrangement mode of the corresponding fractal arrangement laser arrays) to form a fractal-based beam collimator array, and the beam is emitted through the beam collimator array, so that beam expansion and collimation of laser from a fiber waveguide to a free space beam can be realized, and meanwhile, splicing of the fractal-based coherent fiber laser array beam can be realized.
Referring to fig. 10, the present embodiment provides a fractal-based coherent fiber laser array generation system, which includes a seed source 1, a pre-amplification module 2, a beam splitter module 3, a cascade amplification module 4, a phase modulator array 5, a collimation and beam combination module 6, a synthesized light beam processing module 7, a photoelectric detection module 8, and a control system 9. The seed source 1 is used for generating laser beams, the laser beams output by the seed source 1 are amplified through the pre-amplification module 2 and then enter the beam splitter module 3 for beam expansion, and multiple paths of laser beams are generated; the multi-path laser beams split by the beam splitter module 3 are amplified by the cascade amplification module 4, and the amplified laser beams are injected into the phase modulator array 5 for phase regulation. Each path of laser beam regulated and controlled by the phase modulator array 5 is output to the collimation and beam combination module 6, and each path of beam is collimated and output by the collimation and beam combination module 6 and spliced into a coherent fiber laser array beam based on fractal. And transmitting the coherent fiber laser array beam based on fractal to a far field to form an interference light spot. Part of light beams of the coherent fiber laser array light beam based on fractal output from the collimation and beam combination module 6 after passing through the combined light beam processing module 7 are incident to the photoelectric detection module 8. The photoelectric detection module 8 converts the received optical signal into an electric signal and transmits the electric signal to the control system 9. The control system 9 generates a phase control signal according to the received electrical signal and transmits the phase control signal to the phase modulator array, thereby locking and controlling the phase between each path of light beam. The synthetic light beam processing module consists of a high reflector, a focusing lens and a beam splitter and has the functions of extracting light field information of the synthetic light beam and observing light intensity distribution of the synthetic light beam. The light beams output by the collimation and beam combination module pass through the high reflector, the high reflector reflects most energy light beams and transmits the energy light beams in a free space, the light beams containing a small part of energy are transmitted, the transmitted light beams containing the small part of energy pass through the focusing lens and then are split by the beam splitter, one part of light beams are focused to the photoelectric detector for extracting light field information, and the other part of light beams are focused to the light spot analyzer for observing the light intensity distribution of the combined light beams.
In summary, although the present invention has been described with reference to the preferred embodiments, it should be understood that the present invention is not limited thereto, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention.
Claims (9)
1. The fractal-based coherent fiber laser array is characterized in that: the coherent fiber laser array is distributed in the center, namely the center of the array fiber, and comprises N circles of light beams which are annularly distributed from inside to outside around the center of the array fiber, wherein each circle of light beam comprises the same number of sub-light beams, and each sub-light beam in the same circle of light beam has the same optical parameter and is uniformly distributed along the angular direction;
at least two or more continuous light beams in the N circles of light beams form a fractal arrangement laser array; in any two adjacent circles of light beams in the fractal arrangement laser array, the beam waist radius, the beam caliber and the distance between the beam center and the array optical fiber center of each sub-light beam in the circle of light beams close to the inner side are reduced in equal ratio relative to the beam waist radius, the beam caliber and the distance between the beam center and the array optical fiber center of each sub-light beam in the circle of light beams close to the outer side, wherein the equal ratio of reduction is t, and t is more than 0.
2. The fractal-based coherent fiber laser array of claim 1, wherein: the 1 st circle of light beam in the fractal arrangement laser array is the outermost circle of light beam, and the 1 st circle of light beam and the 2 nd circle of light beam … are sequentially arranged from outside to inside; the proportion t of geometric scale reduction of any adjacent n-1 th light beam and n-th light beam in the fractal arrangement laser array is not more than rn/rn-1Wherein r isn-1Is the distance between the beam center of each sub-beam in the n-1 th beam and the center of the array fiber, rnThe distance between the beam center of each sub-beam in the nth beam and the center of the array fiber.
3. The fractal-based coherent fiber laser array of claim 2, wherein: r isnAnd rn-1And the geometric series general formula is satisfied.
4. The fractal-based coherent fiber laser array according to claim 1, 2 or 3, wherein: the laser array is uniformly distributed, and the N circles of light beams have at least two or more continuous circles of light beams to form the uniformly distributed laser array.
5. The fractal-based coherent fiber laser array according to claim 4, wherein: the beam waist radii of all the sub-beams in the uniformly distributed laser array are w0The wavelengths are lambda, the beam apertures are d, and the distances between adjacent rings of beams in the uniformly distributed laser array are the same.
6. The fractal-based coherent fiber laser array according to claim 4, wherein: the fractal arrangement laser arrays and the uniform arrangement laser arrays are alternately arranged.
7. The fractal-based coherent fiber laser array according to claim 5, wherein: the coherent fiber laser array is arranged in a regular hexagon or a circle.
8. A fractal-based coherent fiber laser array generation system as claimed in claim 1, wherein: the device comprises a seed source, a pre-amplification module, a beam splitter module, a cascade amplification module, a phase modulator array and a collimation and beam combination module; the seed source is used for generating laser beams, the laser beams output by the seed source seeds are amplified through the pre-amplification module and then enter the beam splitter module for beam expansion, and multiple paths of laser beams are generated; the multi-path laser beams split by the beam splitter module are amplified by the cascade amplification module, and the amplified laser beams are injected into the phase modulator array for phase regulation and control; each path of laser beam regulated and controlled by the phase modulator array is output to the collimation and beam combination module, the collimation and beam combination module comprises a plurality of optical fiber laser collimators, each path of laser beam corresponds to one optical fiber laser collimator, the plurality of optical fiber laser collimators are arranged according to the arrangement form of the corresponding fractal arrangement laser arrays to form a fractal-based optical beam collimator array, and the fractal-based optical beam collimator array is used for emitting, so that beam expansion and collimation of laser from an optical fiber waveguide to a free space beam are realized, and meanwhile splicing of the fractal-based coherent optical fiber laser array beam is realized.
9. The generation system of claim 8, wherein: the device also comprises a composite light beam processing module, a photoelectric detection module and a control system; part of light beams of the coherent fiber laser array light beam based on fractal output by the collimation and beam combination module after passing through the combined light beam processing module are incident to the photoelectric detection module; the photoelectric detection module converts the received optical signal into an electric signal and transmits the electric signal to the control system; the control system generates a phase control signal according to the received electric signal and transmits the phase control signal to the phase modulator array, so that the locking and the regulation of the phase between each path of light beam are realized.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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