CN117250686A - Rapid mode field disturbance device and method based on columnar piezoelectric ceramics - Google Patents
Rapid mode field disturbance device and method based on columnar piezoelectric ceramics Download PDFInfo
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- CN117250686A CN117250686A CN202311084519.8A CN202311084519A CN117250686A CN 117250686 A CN117250686 A CN 117250686A CN 202311084519 A CN202311084519 A CN 202311084519A CN 117250686 A CN117250686 A CN 117250686A
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- 239000000919 ceramic Substances 0.000 title claims abstract description 105
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000013307 optical fiber Substances 0.000 claims abstract description 70
- 239000000835 fiber Substances 0.000 claims description 16
- 238000001514 detection method Methods 0.000 claims description 7
- 230000008602 contraction Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 41
- 230000003287 optical effect Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000001228 spectrum Methods 0.000 abstract description 4
- 230000002401 inhibitory effect Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 238000004804 winding Methods 0.000 abstract description 3
- 238000009826 distribution Methods 0.000 description 12
- 230000008878 coupling Effects 0.000 description 11
- 238000010168 coupling process Methods 0.000 description 11
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- 238000010586 diagram Methods 0.000 description 6
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- 238000005253 cladding Methods 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02047—Dual mode fibre
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/0994—Fibers, light pipes
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/48—Laser speckle optics
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Abstract
The invention discloses a rapid mode field disturbance device and method based on columnar piezoelectric ceramics, comprising columnar piezoelectric ceramics, multimode optical fibers wound outside the columnar piezoelectric ceramics, a driving power supply connected with the inner diameter and the outer diameter of the columnar piezoelectric ceramics through wires, and an input light source connected with the front end of the multimode optical fibers, wherein the resonance frequency of the piezoelectric ceramics is in the range of 5-100KHz, and the effect of high-speed vibration can be achieved. The piezoelectric ceramic is pressurized and rapidly deforms to enable the coiled optical fiber to be rapidly stretched, high-speed optical mode field disturbance is achieved, the multimode optical fiber with the core diameter of 50-400 um is selected to contain most multimode optical fiber application scenes, the application effect of most coverage can be achieved in practical application, the simple winding technology is adopted, the principle is clear, the structure is novel, materials are easy to obtain, and the price of the device is controllable. The multi-core diameter of the wide spectrum light source and the multi-mode optical fiber is selected so that the application range of the invention is wide. The invention has high mode disturbing speed and good speckle inhibiting effect.
Description
Technical Field
The invention relates to the field of optical engineering, in particular to a rapid mode field disturbance device and method based on columnar piezoelectric ceramics.
Background
When the multimode optical fiber conducts coherent light, the emergent light has granular speckle effect. The cause of speckle formation is the following: 1) On a micro scale, the refractive index distribution changes randomly; 2) The fiber core and the cladding reflecting surface are rough; 3) Interference between fiber modes. Inter-mode interference is a major cause of speckle formation, among others. The vibration of the optical fiber under the dynamic mode disturbance changes the mode coupling state in the light beam transmission process, so that different modes are interfered, and further different speckle structures are formed. The vibration amplitude, frequency and action length are different, and the speckle structure is different. Light field speckle detected by a Charge Coupled Device (CCD) is the accumulation of light intensity over an integration time, and the speckle of different structures becomes spatially uniform due to the cumulative homogenization effect over time. The faster the mode coupling state changes, the more the number of different structure speckles that accumulate, the more pronounced the speckle suppressing effect.
The technical workers at home and abroad have made a great deal of researches on the inhibition of optical fiber speckles, and in the technical aspect of eliminating the laser speckles, the optical fiber speckles can be inhibited in three methods, namely 1) weakening the coherence of a light source at the incident end of the optical fiber, for example, coupling a plurality of beams of light into the optical fiber in different states by utilizing different methods such as a multi-section optical fiber, a lens group array and the like, so as to weaken the speckles at the emergent end of the optical fiber; 2) Dynamic modes, such as vibrating fiber; 3) The formed speckles are re-suppressed at the exit end of the fiber, such as by adding a rotating random phase plate or vibrating diffuser screen in the subsequent optical path. The most straightforward and effective method in the existing research is dynamic scrambling mode. Therefore, deformation of high-speed same-frequency vibration can be applied to the optical fiber to improve the quality of spectral measurement.
The method of stretching the coiled fiber with columnar piezoelectric ceramics to achieve mode field perturbation has many advantages. The vibration of the optical fiber under the dynamic mode disturbance changes the mode coupling state in the light beam transmission process, so that different modes are interfered, and further different speckle structures are formed. The faster the state of the mode coupling changes during the speckle collection time, the better the speckle suppression effect. The optical fiber is wound on the columnar piezoelectric ceramic, and voltage is applied to the piezoelectric ceramic, so that the piezoelectric ceramic deforms, and the optical fiber on the piezoelectric ceramic deforms. The mode disturbance effect is best when the voltage change frequency resonates with the columnar piezoelectric ceramic. Preliminary experiments show that at several natural frequencies of the piezoelectric ceramic, the natural frequency at a low frequency can be selected to obtain a better mode disturbing effect. The columnar piezoelectric ceramic has wide application, mature manufacturing technology and mass production. The coiled optical fiber adopts the traditional communication multimode optical fiber, has low cost and easily available materials, and combines the two to achieve the effect of high-speed mode field disturbance. The reverse piezoelectric effect of the piezoelectric ceramic is utilized to stretch the coiled optical fiber, the natural frequency of the regulation driving and the piezoelectric ceramic is kept consistent, the resonance effect is achieved, and the high-speed disturbance effect can be achieved while the input voltage is controlled and reduced.
In the invention patent publication No. CN1862248A, 11/15 in 2006, namely the method for realizing the homogenization of the intensity of the circular light ring and the optical fiber mode scrambler, a section of optical fiber is clamped between a pair of clamping plates with uneven surfaces and matched with each other. According to the optical fiber mode disturbing effect, in the optical fiber mode scrambler, high-order modes in the optical fiber are mixed, and light spots with uniform intensity distribution are output. The method of the invention utilizes the clamping plate extrusion, the speed of the mixed mode is lower, and the high-speed disturbing mode can not be achieved, so that the effect of inhibiting the speckles is limited. In contrast, the invention has the advantages of high mode disturbing speed, good speckle removing effect, simple operation, convenient manufacture and low requirement on equipment.
Disclosure of Invention
In order to solve the problems in the background technology, the invention innovatively designs a rapid mode field disturbance method and device based on columnar piezoelectric ceramics, and the device has the advantages of simple design, clear principle, rapid mode disturbance speed, good effect and low manufacturing cost.
The technical scheme adopted by the invention is as follows:
the invention discloses a rapid mode field disturbance device based on piezoelectric ceramics, which comprises columnar piezoelectric ceramics, multimode optical fibers wound outside the columnar piezoelectric ceramics, a driving power supply connected with the inner diameter and the outer diameter of the columnar piezoelectric ceramics through wires, and an input light source connected with the front end of the multimode optical fibers, wherein the resonance frequency of the piezoelectric ceramics is in the range of 5-100 KHz.
As a further improvement, the columnar piezoelectric ceramic structure of the invention is hollow cylindrical.
As a further improvement, the rear end of the multimode optical fiber is also connected with a light spot detection device.
As a further improvement, the multimode fiber is wound and closely placed with columnar piezoelectric ceramics.
As a further improvement, the multimode optical fiber has a core diameter of 50-400 um.
As a further improvement, the wavelength of the input light source is 350-2400 nm.
As a further improvement, the wire application points of the driving power supply on the inner and outer diameters are soldered on the inner and outer diameters of the columnar piezoelectric ceramics.
The invention discloses a rapid mode field disturbance method based on piezoelectric ceramics, which is characterized by comprising the following steps of:
1) The resonance frequency of the columnar piezoelectric ceramic is determined to be 5-100KHz, and a driving power supply connected with the inner diameter and the outer diameter of the columnar piezoelectric ceramic through wires applies voltage matched with the resonance frequency.
2) The columnar piezoelectric ceramic resonates to generate high-speed contraction and expansion by applying voltage, and the multimode optical fiber wound outside the columnar piezoelectric ceramic is driven to rapidly stretch.
3) The multimode optical fiber stretches and contracts rapidly to scramble the modes in the optical fiber so as to homogenize the light beam.
Compared with the prior art, the invention has the following beneficial effects:
the invention utilizes the natural frequency of piezoelectric ceramics and the driving input frequency to achieve resonance, the resonance frequency is in the range of 5-100KHz, and the high-speed vibration effect can be achieved by selecting the high-frequency range. The piezoelectric ceramic is pressurized and rapidly deforms to enable the coiled optical fiber to be rapidly stretched, high-speed optical mode field disturbance is achieved, the multimode optical fiber with the core diameter of 50-400 um is selected to contain most multimode optical fiber application scenes, and the application effect of most coverage can be achieved in practical application. The wavelength of the test light source is 350-2400 nm, the wide spectrum range from visible light to communication wavelength is covered, the exposure effect can be optimized to a certain extent when the test light source is applied to ultraviolet exposure, and the test light source has great application potential in the aspect of laser processing. The wide spectrum range of the light source and the multi-core diameter of the multi-mode optical fiber expand the application scene of the invention, and the high-frequency driving voltage and the piezoelectric ceramics are matched to achieve resonance to drive the multi-mode optical fiber wound on the surface to stretch, thereby achieving the effect of rapid disturbance. The vibration of the optical fiber under the dynamic mode disturbance changes the mode coupling state in the light beam transmission process, so that different modes are interfered, and further different speckle structures are formed. The faster the state of the mode coupling changes during the speckle collection time, the better the speckle suppression effect. The method can reduce the manufacturing cost and improve the speed of the disturbing mode. The input signal light can be effectively homogenized to output the light source after passing through the coiled optical fiber on the columnar piezoelectric ceramics with the natural frequency.
The invention adopts simple winding technology, has clear principle, novel structure and easily obtained materials, and ensures that the price of the device is controllable. The multi-core diameter of the wide spectrum light source and the multi-mode optical fiber is selected so that the application range of the invention is wide. The invention has high mode disturbing speed and good speckle inhibiting effect.
Drawings
FIG. 1 is a schematic diagram of a rapid mode field disturbance device based on columnar piezoelectric ceramics;
FIG. 2 is a schematic structural diagram of a columnar piezoelectric ceramic in a columnar piezoelectric ceramic-based rapid mode field perturbation device according to the present invention;
in the figure, I is piezoelectric ceramic, II is multimode optical fiber, and III is an electric wire;
FIG. 3 is a graph of measured impedance based on a columnar piezoelectric ceramic sample in accordance with the present invention;
FIG. 4 is a two-dimensional diagram and a three-dimensional diagram of detection of a far field on a CCD before and after mode disturbing based on a columnar piezoelectric ceramic sample; the left is the original output light spot, and the right is the tested light spot after the mode disturbance;
FIG. 5 is a graph showing the speckle contrast for testing embodiments of the present invention based on different core multimode fibers of a columnar piezoelectric ceramic sample.
Detailed Description
The invention discloses a rapid mode field disturbance device based on piezoelectric ceramics I, which comprises columnar piezoelectric ceramics I, multimode optical fibers II wound outside the columnar piezoelectric ceramics I, a driving power supply connected with the inner diameter and the outer diameter of the columnar piezoelectric ceramics I through wires III, and an input light source connected with the front end of the multimode optical fibers II, wherein the resonance frequency of the piezoelectric ceramics I is in the range of 5-100KHz, the columnar piezoelectric ceramics I is in a hollow cylinder shape, the rear end of the multimode optical fibers II is also connected with spot detection equipment, the multimode optical fibers II are wound and closely placed with the columnar piezoelectric ceramics I, the core diameter of the multimode optical fibers II is 50-400 um, the wavelength of the input light source is 350-2400 nm, and the application point of the wires III of the driving power supply on the inner diameter and the outer diameter of the input light source is soldered on the inner diameter and the outer diameter of the columnar piezoelectric ceramics I.
The invention also discloses a rapid mode field disturbance method based on the piezoelectric ceramic I, which comprises the following steps:
1) The resonance frequency of the columnar piezoelectric ceramic I is determined to be 5-100KHz, and a driving power supply connected with the inner diameter and the outer diameter of the columnar piezoelectric ceramic I through a wire III applies a voltage matched with the resonance frequency.
2) The columnar piezoelectric ceramic I resonates to generate high-speed contraction and expansion by applying voltage, and the multimode optical fiber II wound outside the columnar piezoelectric ceramic I is driven to rapidly stretch.
3) The multimode optical fiber II stretches and contracts rapidly to scramble the modes in the optical fiber so as to homogenize the light beam.
The technical scheme of the invention is further described below through specific embodiments with reference to the accompanying drawings.
The invention discloses a rapid polarization disturbing device based on columnar piezoelectric ceramics I, which comprises columnar piezoelectric ceramics I, multimode optical fibers II and driving voltage, wherein the multimode optical fibers II are closely wound on the columnar piezoelectric ceramics I, the positive electrode of the driving voltage is added to the inner side of the piezoelectric ceramics I, and the negative electrode of the driving voltage is added to the outer side of the piezoelectric ceramics I.
When the signal light is incident into the device, driving voltage III is applied to the piezoelectric ceramic I, so that the piezoelectric ceramic I resonates with the driving voltage, the piezoelectric ceramic I vibrating at high speed contracts and expands rapidly, and the multimode fiber II with the surface wound and multimode fiber II is driven to stretch, so that the effect of rapid disturbance is achieved. The vibration of the optical fiber under the dynamic mode disturbing effect changes the mode coupling state in the light beam transmission process, so that different mode-to-mode conversion is caused, and further different speckle structures are formed. The faster the state of the mode coupling changes during the speckle collection time, the better the speckle suppression effect. The method can reduce the manufacturing cost and improve the speed of the disturbing mode.
Fig. 1 is a schematic diagram of a piezoelectric ceramic i-based rapid polarization disturbing device according to the present invention, which is composed of a plurality of block parts, including an input light source and a light spot detecting device, and a key vibration device in the middle part. The first part is a light source part, and the invention adopts a 650 nm-band laser light source for debugging. The second part is the key part of the invention, and the piezoelectric ceramic I is driven to apply the voltage with the same frequency as the natural frequency to the piezoelectric ceramic I, so that the piezoelectric ceramic I resonates, and the multimode optical fiber II wound on the surface of the columnar piezoelectric ceramic I is driven to rapidly deform, so that the modes of output light are mixed, and the effect of high-speed mode disturbing and speckle suppression is achieved. The last block is a test block, and a CCD camera is used for detecting the device effect.
FIG. 2 is a schematic diagram of a fast polarization disturbing device based on piezoelectric ceramics I according to the present invention, which comprises columnar piezoelectric ceramics I, multimode optical fibers II wound outside the columnar piezoelectric ceramics I, and driving voltages applied to the inner and outer diameters of the piezoelectric ceramics I. The multimode fiber II is wound and clung to the columnar piezoelectric ceramic I, the front end of the multimode fiber II is connected with an input light source, and the rear end of the multimode fiber II is connected with a facula detection device. The driving voltage applying points on the inner and outer diameters are soldered on the inner and outer diameters of the columnar piezoelectric ceramic I, the inner diameter is positive, and the outer diameter is negative. The resonance frequency of the piezoelectric ceramic I is in the range of 5-100 KHz. The driving part applies the same-frequency voltage to the positive electrode and the negative electrode of the piezoelectric ceramic to drive the piezoelectric ceramic I to generate resonance, and the piezoelectric ceramic I expands outwards and contracts rapidly to drive the tightly wound optical fiber to stretch. The vibration of the optical fiber under the dynamic mode disturbing effect changes the mode coupling state in the light beam transmission process, so that different mode-to-mode conversion is caused, and further different speckle structures are formed. The faster the state of the mode coupling changes, the faster the vibration drives the fiber change, and the faster the mode change in the light during the speckle collection time. The better the speckle suppressing effect. The piezoelectric ceramic I with high-speed resonance enables the mode field of the optical fiber output light to be quickly mixed and changed, and achieves the effects of removing speckles and homogenizing light beams.
The specific embodiments of the invention and the implementation conditions thereof are as follows:
firstly, selecting the columnar piezoelectric ceramics I, and selecting the piezoelectric ceramics I with proper impedance and natural frequency for testing. The multimode optical fiber II is wound on the periphery of the columnar piezoelectric ceramic I by using a winding machine, and positive electrode wires and negative electrode wires are welded on the inner side and the outer side of the columnar piezoelectric ceramic I respectively, so that the follow-up application of driving voltage is facilitated. The driving voltage is regulated, and the piezoelectric ceramic I and the driving voltage are subjected to multiple tests to achieve resonance, so that the best and fastest vibration effect can be achieved. Early test selection is aimed at achieving better and faster mode disturbing effects.
Then, the whole device system is tested. The incoming light source and the CCD are respectively arranged at two sides of the system for inputting and receiving the optical signals. The light signal is input by the light source, transmitted to the light spot detection device, namely the CCD after passing through the multimode optical fiber II controlled by the piezoelectric resonance device. And comparing the test result without the application of the driving voltage with the test result with the application of the driving voltage, and detecting the mode disturbing effect. The experimental results show that on the detection of the plane effect and the stereoscopic effect: the plane effect shows that when no voltage is applied, a large amount of speckles exist on the light spots, the distribution is uneven, when the voltage is applied, the speckles of the light spots are obviously reduced, and the light beams become uniform; the stereoscopic effect shows that when no voltage is applied, the irregular stepped columnar distribution formed according to the intensity of the light beam can show that the intensity distribution of the light beam is uneven, the speckles are obvious, after the voltage is applied, the intensity distribution of the light beam becomes smooth, the irregular stepped columnar distribution almost disappears, the speckles almost disappear, and the disturbance effect is obvious. The output light achieves a better speckle removing effect, and the speckle homogenizing effect is obvious.
As shown in fig. 4, the upper left image is a far-field actually measured image when no voltage is applied, at this time, a large amount of speckles exist in the light spot, the distribution is uneven, and the upper right image is a far-field perturbed mode actually measured image when voltage is applied, so that the speckle of the light spot is obviously reduced, and the light beam becomes uniform. The lower left image is a light spot 3D image when no voltage is applied, the uneven distribution of the light beam intensity can be seen according to the irregular stepped columnar distribution formed by the light beam intensity, the speckles are obvious, the lower right image is a speckle 3D image after the voltage is applied, the light beam intensity distribution can be obviously seen to be smooth, the irregular stepped columnar distribution almost disappears, the speckles almost disappear, and the disturbing mold effect is obvious. The output light achieves a better speckle removing effect, and the speckle homogenizing effect is obvious.
The comparison test is carried out by adopting the multimode optical fibers II with different core diameters, namely 62.5 microns, 125 microns, 200 microns and 400 microns, and the experimental result is shown in figure 5, so that the multimode optical fiber II with 200 microns can achieve the best mode disturbing effect after voltage is applied to 24V, and the speckle contrast is reduced to below 10 percent; the optical fibers with two fiber cores smaller than 200 micrometers have better mode disturbing effect along with the increase of the core diameter; in contrast, the 400 μm core multimode fiber II had slightly reduced speckle removal after voltage application, but the speckle contrast remained below 10%.
The above-described embodiments are intended to illustrate the present invention, not to limit it, and any modifications and variations made thereto are within the spirit of the invention and the scope of the appended claims.
Claims (8)
1. A quick mode field disturbance device based on piezoceramics is characterized in that: the high-power piezoelectric ceramic comprises columnar piezoelectric ceramic (I), multimode optical fibers (II) wound outside the columnar piezoelectric ceramic (I), a driving power supply connected with the inner diameter and the outer diameter of the columnar piezoelectric ceramic (I) through wires (III), and an input light source connected with the front end of the multimode optical fibers (II), wherein the resonance frequency of the piezoelectric ceramic is in the range of 5-100 KHz.
2. The piezoelectric ceramic-based rapid mode field perturbation device of claim 1, wherein: the columnar piezoelectric ceramic (I) is hollow cylindrical in structure.
3. The piezoelectric ceramic-based rapid mode field perturbation device of claim 1, wherein: the rear end of the multimode optical fiber (II) is also connected with a facula detection device.
4. A rapid mode field perturbation device based on piezoelectric ceramics according to claim 1 or 2 or 3, characterized in that: the multimode fiber (II) is wound and clung to the columnar piezoelectric ceramic (I).
5. The piezoelectric ceramic-based rapid mode field perturbation device of claim 4, wherein: the core diameter of the multimode optical fiber (II) is 50-400 um.
6. The piezoelectric ceramic-based rapid mode field perturbation device of claim 4, wherein: the wavelength of the input light source is 350-2400 nm.
7. The piezoelectric ceramic-based rapid mode field perturbation device of claim 1 or 2 or 3 or 5 or 6, wherein: and the wire (III) application point of the driving power supply on the inner and outer diameters is soldered on the inner and outer diameters of the columnar piezoelectric ceramics.
8. The rapid mode field disturbance method based on the piezoelectric ceramic is characterized by comprising the following steps of:
1) The resonance frequency of the columnar piezoelectric ceramic (I) is determined to be 5-100KHz, and a driving power supply connected with the inner diameter and the outer diameter of the columnar piezoelectric ceramic (I) through a wire (III) applies a voltage matched with the resonance frequency.
2) The voltage is applied to make the columnar piezoelectric ceramic (I) resonate to generate high-speed contraction and expansion, and the multimode optical fiber (II) wound outside the columnar piezoelectric ceramic (I) is driven to rapidly stretch.
3) The multimode optical fiber (II) stretches and contracts rapidly to scramble the modes in the optical fiber so as to homogenize the light beam.
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