CN103575930B - A kind of utilize Hollow-Core Photonic Crystal Fibers to prepare ligh trap method and device - Google Patents
A kind of utilize Hollow-Core Photonic Crystal Fibers to prepare ligh trap method and device Download PDFInfo
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- CN103575930B CN103575930B CN201310500188.1A CN201310500188A CN103575930B CN 103575930 B CN103575930 B CN 103575930B CN 201310500188 A CN201310500188 A CN 201310500188A CN 103575930 B CN103575930 B CN 103575930B
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Abstract
The invention discloses a kind of utilize Hollow-Core Photonic Crystal Fibers to prepare ligh trap method and device.The two ends of Hollow-Core Photonic Crystal Fibers and the welding of two single-mode fiber exit ends, then the fundamental-mode gaussian beam of outgoing in two single-mode fibers propagated in opposite directions is utilized, be strapped in by spheroidal particle in the hollow core of Hollow-Core Photonic Crystal Fibers, therefore spheroidal particle reaches stress balance in ligh trap; Change the size of luminous power in different single-mode fiber, change the trapping stiffness that spheroidal particle is subject to, control acceleration and the moving displacement of spheroidal particle.Device comprises the substrate of fiber-optic trap system, two single-mode fibers, Hollow-Core Photonic Crystal Fibers, coupling mechanism, light intensity modulator, laser instrument, photoelectric image detector, a computing machine etc.Invention increases the capacity usage ratio of laser beam and the alignment precision of laser beam, avoid Brownian movement in a liquid on the impact of spheroidal particle motion state.
Description
Technical field
The present invention relates to optical inertial navigation and optical engineering field, particularly relate to a kind of utilize Hollow-Core Photonic Crystal Fibers to prepare ligh trap method and device.
Background technology
By the photon stream of the known light beam of quantum theory to be a group with the light velocity move, have momentum.When light beam, at dielectric surface, refraction and reflection occurs, the speed of photon and direction change, and cause the conversion of its momentum vector.Equal the momentum change amount of spheroidal particle according to the momentum converted quantity of law of conservation of momentum photon, so the momentum respective change of spheroidal particle, also namely there is the effect of power in light beam to spheroidal particle, is called optical radiation pressure.Include along direction of beam propagation scattering force and always point to light intensity compared with the gradient force of strength.Under the effect of these two power, light beam can catch spheroidal particle in certain area, and make it be stabilized in certain ad-hoc location, this region is called ligh trap.
The method that tradition prepares fiber-optic trap is: central authorities spheroidal particle being placed in glass substrate " ten " font groove, and the Gaussian beam of outgoing in the single-mode fiber put in two-dimensional space four " ten " fonts, aimed in opposite directions or two " one " fonts are put, the Gaussian beam of outgoing applies trapping stiffness to the spheroidal particle in liquid in the single-mode fiber aimed in opposite directions.
The shortcoming that tradition prepares fiber-optic trap method is: spheroidal particle is subject to Brownian movement and near equilibrium position, does random motion in liquid environment, affects the action effect of trapping stiffness; Same spheroidal particle aimed in opposite directions by the two pairs of single-mode fibers or same spheroidal particle aimed in opposite directions by a pair single-mode fiber, and alignment precision is very strict and catch difficulty and increase; Single-mode fiber doping high purity silicon fibre core, optical fiber property and parameter such as damage threshold, decay, nonlinear effect and GVD (Group Velocity Dispersion) etc. all will be subject to the impact of silicon materials relevant parameter, the laser energy loss of single-mode fiber outgoing is large, and the ligh trap acting force that unit optical power produces is little.
Summary of the invention
In order to overcome the deficiencies in the prior art, the object of this invention is to provide a kind of utilize Hollow-Core Photonic Crystal Fibers to prepare ligh trap method and device.
A kind of method utilizing Hollow-Core Photonic Crystal Fibers to prepare ligh trap, the two ends of Hollow-Core Photonic Crystal Fibers and the welding of two single-mode fiber exit ends, then the fundamental-mode gaussian beam of outgoing in two single-mode fibers propagated in opposite directions is utilized, be strapped in by spheroidal particle in the hollow core of Hollow-Core Photonic Crystal Fibers, therefore spheroidal particle reaches stress balance in ligh trap; Change the size of luminous power in different single-mode fiber, change the trapping stiffness that spheroidal particle is subject to, control acceleration and the moving displacement of spheroidal particle.
Utilize Hollow-Core Photonic Crystal Fibers to prepare a device for ligh trap, comprise the first single-mode fiber, the second single-mode fiber, Hollow-Core Photonic Crystal Fibers, the glass substrate of band groove, the first fiber coupler, the second fiber coupler, the first light intensity modulator, the second light intensity modulator, the first laser instrument, second laser, photoelectric image detector, computing machine; Computing machine, with video acquisition device, obtains the video information of photoelectric image detector by video acquisition device; Spheroidal particle is placed in the hollow core of described Hollow-Core Photonic Crystal Fibers; The output terminal of the first single-mode fiber, the second single-mode fiber respectively with the welding of Hollow-Core Photonic Crystal Fibers both ends of the surface, be then placed in the glass substrate of described band groove, be fixed on groove; The input end of the first single-mode fiber is coupled to the first fiber coupler, and the other end of the first fiber coupler is connected with the first light intensity modulator, and the light of the first laser emitting, after the first light intensity modulator modulation, is input to the first single-mode fiber; The input end of the second single-mode fiber is coupled to the second fiber coupler, and the other end of the second fiber coupler is connected with the second light intensity modulator, and the light of second laser outgoing, after the second light intensity modulator modulation, is input to the second single-mode fiber; Photoelectric image detector is placed in the top of spheroidal particle, and to spheroidal particle imaging; Photoelectric image detector is connected with computing machine.
Preferably, there are bar linear pattern groove in the central authorities of described glass substrate, and groove becomes V face del, and V face is tangent with the cylinder of the first single-mode fiber, the second single-mode fiber, Hollow-Core Photonic Crystal Fibers respectively.
Preferably, transparent ultraviolet glue is filled in described groove.
Preferably, described photoelectric image detector comprises microcobjective and image-forming component, and described image-forming component is CCD or CMOS.
Preferably, described Hollow-Core Photonic Crystal Fibers is arranged in described groove, and its length is 1/1 to two/3rd of groove length.
Preferably, the first described single-mode fiber, the second single-mode fiber model are identical, and the first described single-mode fiber is identical with the core diameter of Hollow-Core Photonic Crystal Fibers.
Preferably, described spheroidal particle is the spherical particulate of silicon dioxide.
The invention has the beneficial effects as follows: optical fiber is fixed in the central straight groove of glass substrate, simplify preparation technology; The light that hollow optic fibre can realize more than 99% is propagated in atmosphere instead of in glass material, thus greatly reduces the impact of fiber optic materials characteristic on optical property and optical fiber property, improves the capacity usage ratio of laser beam; The two ends of Hollow-Core Photonic Crystal Fibers and the welding of two single-mode fiber exit ends, improve the alignment precision of laser beam; The hollow core structure of Hollow-Core Photonic Crystal Fibers inside, avoids the impact of the Brownian movement in traditional fiber ligh trap in spheroidal particle motion state liquid body.
Accompanying drawing explanation
Fig. 1 is the structural representation of apparatus of the present invention;
Fig. 2 is the diagrammatic cross-section of hollow core photonic crystal fiber of the present invention;
Fig. 3 is the schematic diagram after the present invention's fixed fiber on the glass substrate of linear pattern V face groove completes;
Schematic diagram when Fig. 4 is the three section optical fiber of laser beam by apparatus of the present invention;
Wherein 1.1 is the first single-mode fiber, 1.2 is the second single-mode fiber, 2 is Hollow-Core Photonic Crystal Fibers, 3 is spheroidal particle, 4 for being with the glass substrate of groove, 5.1 is the first fiber coupler, 5.2 is the second fiber coupler, 6.1 is the first light intensity modulator, 6.2 is the second light intensity modulator, 7.1 is the first laser instrument, 7.2 is second laser, 8 is photoelectric image detector, 9 is computing machine, 10 is the hollow core of Hollow-Core Photonic Crystal Fibers, 11 be Hollow-Core Photonic Crystal Fibers hollow hole formed photonic bandgap, 12 is the covering of Hollow-Core Photonic Crystal Fibers, 13 be single-mode fiber and hollow photon crystal welding after the fibre core of whole optical fiber, 14 is laser gaussian beam.
Embodiment
The present invention is further illustrated below in conjunction with accompanying drawing.
With reference to shown in Fig. 1, utilize Hollow-Core Photonic Crystal Fibers to prepare a device for ligh trap, comprise glass substrate 4, first fiber coupler 5.1, second fiber coupler 5.2, first light intensity modulator 6.1, second light intensity modulator 6.2, first laser instrument 7.1, second laser 7.2, photoelectric image detector 8, the computing machine 9 of the first single-mode fiber 1.1, second single-mode fiber 1.2, Hollow-Core Photonic Crystal Fibers 2, band groove; Computing machine 9, with video acquisition device, obtains the video information of photoelectric image detector 8 by video acquisition device; Spheroidal particle 3 is placed in the hollow core of described Hollow-Core Photonic Crystal Fibers 2; The output terminal of the first single-mode fiber 1.1, second single-mode fiber 1.2 respectively with the welding of Hollow-Core Photonic Crystal Fibers 2 both ends of the surface, be then placed in the glass substrate 4 of described band groove, be fixed on groove; The input end of the first single-mode fiber 1.1 is coupled to the first fiber coupler 5.1, the other end of the first fiber coupler 5.1 is connected with the first light intensity modulator 6.1, the light of the first laser instrument 7.1 outgoing, after the first light intensity modulator 6.1 is modulated, is input to the first single-mode fiber 1.1; The input end of the second single-mode fiber 1.2 is coupled to the second fiber coupler 5.2, the other end of the second fiber coupler 5.2 is connected with the second light intensity modulator 6.2, the light of second laser 7.2 outgoing, after the second light intensity modulator 6.2 is modulated, is input to the second single-mode fiber 1.2; Photoelectric image detector 8 is placed in the top of spheroidal particle 3, and to spheroidal particle imaging; Photoelectric image detector 8 is connected with computing machine 9.
With reference to shown in Fig. 2, Hollow-Core Photonic Crystal Fibers structure is divided into three layers, i.e. hollow core 10, the photonic bandgap 11 of hollow hole formation of Hollow-Core Photonic Crystal Fibers, the covering 12 of Hollow-Core Photonic Crystal Fibers of Hollow-Core Photonic Crystal Fibers, because the core diameter of Hollow-Core Photonic Crystal Fibers is at 7 ~ 14 microns, the core diameter of 125 microns of single-mode fibers is at 8 ~ 10 microns, in order to improve the sensitivity of spheroidal particle to displacement, convenient observation, the diameter of the spherical particulate of usual selection silicon dioxide is at 2 ~ 4 microns, and quality is 10
-9--10
-7gram.
Method of the present invention is: the two ends of Hollow-Core Photonic Crystal Fibers and the welding of two single-mode fiber exit ends, then the fundamental-mode gaussian beam of outgoing in two single-mode fibers propagated in opposite directions is utilized, be strapped in by spheroidal particle in the hollow core of Hollow-Core Photonic Crystal Fibers, therefore spheroidal particle reaches stress balance in ligh trap.Change the size of luminous power in different single-mode fiber, change the trapping stiffness that spheroidal particle is subject to, control acceleration and the moving displacement of spheroidal particle.
Principle of work of the present invention is:
The light beam of two single-mode fiber 1 end faces outgoing is propagated in opposite directions in Hollow-Core Photonic Crystal Fibers 2, spherical silicon dioxide spheroidal particle 3 in hollow 2 fibre cores of Hollow-Core Photonic Crystal Fibers is caught, it is made to be stabilized near certain position of optical axis direction, due to fiber coupler 5 and the uneven center causing spherical silicon dioxide spheroidal particle 3 can not rest on Hollow-Core Photonic Crystal Fibers 2 of fused fiber splice, and depart from center certain distance, this position and equilibrium position.Regulate the size of luminous power in different single-mode fiber, luminous power by a light intensity modulator 6 tunes up, the luminous power of another light intensity modulator 6 is constant, luminous power due to outgoing in single-mode fiber 1 varies in size and causes varying in size of trapping stiffness, captured silicon dioxide spherical particulate 3 is understood to the little lateral movement of luminous power, the image-forming component of photoelectric image detector 6 is utilized to obtain spheroidal particle 3 sport video, and send computing machine 9 to by video frequency collection card, computing machine 9 is observed the motion state of spheroidal particle 3.Due to the spherical particulate 3 of silicon dioxide be subject to along direction of beam propagation scattering force and always point to light intensity compared with the gradient force of strength, and light distribution is uneven, sensing light intensity compares large two orders of magnitude of scattering force along direction of beam propagation compared with the gradient force of strength, make the motion of spheroidal particle 3 mainly by the effect of the radial gradient power of relative laser beam, make the spherical silicon dioxide spheroidal particle 3 that is captured in the uneven respectively and rotary motion in the situation that varies in size of two laser beam light intensity, computing machine 9 is observed the motion state of spheroidal particle 3.
Embodiment
A kind of concrete steps utilizing Hollow-Core Photonic Crystal Fibers to prepare the device of ligh trap are:
One, glass substrate 4 is made, spheroidal particle 3 is placed in Hollow-Core Photonic Crystal Fibers 2 hollow core, two single-mode fiber 1 outgoing end faces are connected with Hollow-Core Photonic Crystal Fibers 2 melting, three optical fiber are fixed in the V-type groove of glass substrate 4 by transparent ultraviolet glue, and accompanying drawing 3 is shown in by the schematic diagram of glass substrate made after this step completes;
Two, glass substrate 4 level is placed in photoelectric image detector 8 times, open photoelectric image detector 8, computing machine 9 and video acquisition software, the microcobjective of photoelectric image detector 8 is placed in minimum multiplying power, from the position of three-dimensional coarse adjustment glass substrate 4, make to show in video acquisition software Hollow-Core Photonic Crystal Fibers 2 as clear, secondly microcobjective is placed in larger multiplying power and finely tunes microcobjective, make the spheroidal particle 3 shown in video acquisition software as clear;
Three, laser instrument 7 is opened, laser instrument 7 is regulated to make the luminous power of two laser instrument 7 outgoing equal sizes, open light intensity modulator 6, regulate two light intensity modulators 6 to make the optical modulation of laser instrument 7 outgoing become the two-beam that two-beam is identical by force, two light beams are input in two single-mode fibers 1 respectively;
Four, horizontal positioned glass substrate 4, regulate light intensity modulator 6, make the luminous power of two bundle laser different, make spheroidal particle 3 slowly mobile certain position being finally stabilized in Hollow-Core Photonic Crystal Fibers 2 hollow core, after single-mode fiber and hollow photon crystal welding whole optical fiber fibre core 13 and stable time the three piece optical fiber of laser gaussian beam 14 by apparatus of the present invention time schematic diagram see accompanying drawing 4;
Five, glass substrate 4 is vertically placed, optical fiber direction is also vertical, photoelectric image detector 8 and glass substrate 9 plane are positioned at the same side, regulate light intensity modulator 6, the laser intensity above spheroidal particle 3 is made to be greater than the laser intensity of below, when the synthesis trapping stiffness that spheroidal particle 3 is subject to and gravitational equilibrium, in video acquisition software, show spheroidal particle 3 move and stablize in this equilibrium position.
Be only specific embodiments of the invention above, but the present invention is not limited thereto, the changes that any person skilled in the art can think of, all should drops on protection scope of the present invention.
Claims (7)
1. the method utilizing Hollow-Core Photonic Crystal Fibers to prepare ligh trap, it is characterized in that: the two ends of Hollow-Core Photonic Crystal Fibers and the welding of two single-mode fiber exit ends, then the fundamental-mode gaussian beam of outgoing in two single-mode fibers propagated in opposite directions is utilized, be strapped in by spheroidal particle in the hollow core of Hollow-Core Photonic Crystal Fibers, therefore spheroidal particle reaches stress balance in ligh trap; Change the size of luminous power in different single-mode fiber, change the trapping stiffness that spheroidal particle is subject to, control acceleration and the moving displacement of spheroidal particle.
2. method according to claim 1 utilizes Hollow-Core Photonic Crystal Fibers to prepare a device for ligh trap, it is characterized in that: the glass substrate (4), the first fiber coupler (5.1), the second fiber coupler (5.2), the first light intensity modulator (6.1), the second light intensity modulator (6.2), the first laser instrument (7.1), second laser (7.2), photoelectric image detector (8), the computing machine (9) that comprise the first single-mode fiber (1.1), the second single-mode fiber (1.2), Hollow-Core Photonic Crystal Fibers (2), band groove; Computing machine (9), with video acquisition device, obtains the video information of photoelectric image detector (8) by video acquisition device; Spheroidal particle (3) is placed in the hollow core of described Hollow-Core Photonic Crystal Fibers (2); The output terminal of the first single-mode fiber (1.1), the second single-mode fiber (1.2) respectively with Hollow-Core Photonic Crystal Fibers (2) both ends of the surface welding, be then placed in the glass substrate (4) of described band groove, be fixed on groove; The input end of the first single-mode fiber (1.1) is coupled to the first fiber coupler (5.1), the other end of the first fiber coupler (5.1) is connected with the first light intensity modulator (6.1), the light of the first laser instrument (7.1) outgoing, after the first light intensity modulator (6.1) modulation, is input to the first single-mode fiber (1.1); The input end of the second single-mode fiber (1.2) is coupled to the second fiber coupler (5.2), the other end of the second fiber coupler (5.2) is connected with the second light intensity modulator (6.2), the light of second laser (7.2) outgoing, after the second light intensity modulator (6.2) modulation, is input to the second single-mode fiber (1.2); Photoelectric image detector (8) is placed in the top of spheroidal particle (3), and to spheroidal particle imaging; Photoelectric image detector (8) is connected with computing machine (9).
3. device according to claim 2, it is characterized in that: there are bar linear pattern groove in the central authorities of described glass substrate (4), groove becomes V face del, and V face is tangent with the cylinder of the first single-mode fiber (1.1), the second single-mode fiber (1.2), Hollow-Core Photonic Crystal Fibers (2) respectively.
4. device according to claim 2, is characterized in that: fill transparent ultraviolet glue in described groove.
5. device according to claim 2, is characterized in that: described photoelectric image detector (8) comprises microcobjective and image-forming component, and described image-forming component is CCD or CMOS.
6. device according to claim 2, is characterized in that: described Hollow-Core Photonic Crystal Fibers (2) is arranged in described groove, and its length is 1/1 to two/3rd of groove length.
7. device according to claim 2, it is characterized in that: described the first single-mode fiber (1.1), the second single-mode fiber (1.2) model are identical, described the first single-mode fiber (1.1) is identical with the core diameter of Hollow-Core Photonic Crystal Fibers (2).
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| CN105759073B (en) * | 2016-03-07 | 2019-02-22 | 浙江大学 | Total closed type chip ligh trap sensing control unit and preparation method thereof |
| CN107024604B (en) * | 2017-02-18 | 2019-04-16 | 浙江大学 | A kind of totally enclosed type ligh trap sensing control unit and preparation method thereof |
| CN109004973B (en) * | 2018-07-04 | 2021-09-07 | 广州广电计量检测股份有限公司 | OTDR performance evaluation device and method |
| CN111261312A (en) * | 2020-01-18 | 2020-06-09 | 江苏锐精光电研究院有限公司 | Micro optical tweezers device and method based on self-focusing lens pair |
| CN111536960B (en) * | 2020-04-30 | 2022-01-18 | 浙江大学 | Double-ring parallel resonant gyro system and double-closed-loop digital demodulation method thereof |
| CN115938634B (en) * | 2023-03-13 | 2023-06-27 | 之江实验室 | Particle transfer suspension method and device based on capillary glass tube loading |
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| CN101320049A (en) * | 2008-07-11 | 2008-12-10 | 浙江大学 | Apparatus for measuring acceleration by double optical beams, optical fibers and light traps |
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