Ukuze ngaxeshanye kunyibilikiswe izinto kumacala omabini ojongano kwaye kusekwe ibhondi enamandla amakhulu e-micro-region, indawo yokugxila ye-laser kufuneka igxile ngokuchanekileyo kwisampulu, nto leyo ebeka iimfuno ezingqongqo ekuchanekeni kokucubungula kwenkqubo yokuxhuma. Ukongeza, ngenxa ye-axial intensity gradient enkulu ye-Gaussian beam emva kokugxila, ubushushu be-focal field abulingani, nto leyo eyenza kube lula ukwenza iziphene ezincinci nezingenamsebenzi kummandla ochaphazelekileyo yi-laser, nto leyo echaphazela umgangatho wokuxhuma wesampulu.
Itekhnoloji yokubumba ukukhanya kwendawo ingasetyenziselwa ukuvelisa imisebe yeBessel engacwangciswanga ukuze kuphuculwe ukusasazwa kobunzulu bentsimi ye-laser focal. Le ndlela inciphisa i-axial intensity gradient kwaye yandisa ubude be-focal, ngaloo ndlela inyusa umlinganiselo wobunzulu-ukuya-kububanzi bommandla wempembelelo yobushushu owenziwe yi-laser. Ngenxa yoko, inciphisa iimfuno zokuchaneka kokugxila kwenkqubo ye-laser welding, iphucula umgangatho kunye nokusebenza kakuhle kwe-welding.
1. Ukuveliswa kunye noyilo lweeParameter zeBessel Beams ezingaphazamisiyo
Ngo-1987, uDurnin waqala ngokucebisa umqadi weBessel olandela i-zero-order, obonisa iimpawu ezizodwa ezingaphazamisiyo: ukusasazwa kobunzulu bentsimi yokukhanya enqamlezileyo akutshintshi ngexesha lokusasazeka, kwaye ubungakanani bendawo ephakathi buhlala busondele kumda wokusasazeka. Ukongeza, imiqadi yeBessel ikwabonisa ipropati yokuziphilisa ngexesha lokusasazeka. Xa indawo ephakathi ithintelwe, ukukhanya okujikelezileyo kuya kudibana ukuya embindini ukuze "kulungiswe" indawo ephakathi. Intetho yezibalo yokusasazwa kwentsimi yokukhanya enqamlezileyo yomqadi weBessel olandela i-zero yile:
Kwintetho:
- I-J0 imele umsebenzi we-Bessel we-zero-order.
- u-r kunye no-φ zizinto ze-radial kunye ne-angular coordinate, ngokulandelelanayo.
- u-z ngumgama wokusasazeka.
- I-Kr kunye ne-Kz zizinto ze-wavevector ezinqamlezileyo nezinde, ngokulandelanayo.
Indawo ephambili ephambili ye-zero-order Bessel beam inamandla okuvalela, okuvumela amanqanaba okukhanyiswa kombane angango-TW/cm² okanye ngaphezulu, anokuvuselela ngempumelelo ukufunxwa kwezinto ezingezizo ezingqameneyo. Okubaluleke ngakumbi, uphawu lokusasazeka olungenasiphazamiso lwe-zero-order Bessel beams lubonelela ngobunzulu obukhulu bokugxila kunye ne-axial intensity gradient encinci, ngaloo ndlela kudala intsimi yobushushu ephantse ifane kwaye icinezele ukwakheka kweziphene ze-welding.
Lo mfanekiso ulandelayo ubonisa uthelekiso lobude be-focal beams zeBessel kunye neGaussian beams phantsi kobuchule obufanayo bokugquma. I-Bessel beams zinobunzulu obukhulu bokugxila ngelixa zigcina ububanzi be-focal spot ye-transverse micron-level.
Kukho iindlela ezahlukeneyo zokuvelisa imisebe yeBessel engacwangciswanga, kwaye ezi ndlela zintathu zilandelayo zixhaphakile:
Indlela yokuVula i-Annular: Indlela yokuVula i-annular, njengoko igama lisitsho, ibandakanya ukusebenzisa umngxuma we-annular ukuvelisa imisebe yeBessel. Le yayikwayindlela yokuqala ephumeleleyo yokwenza imisebe yeBessel. Umzobo ongezantsi ubonisa indlela yokuVula i-annular yokwenza imisebe yeBessel. I-plane wave iyenzeka ngokuthe nkqo kwi-annular slit ukusuka ekhohlo kwaye kwenzeka i-diffraction.
Emva koko, ilensi elungileyo yenza utshintsho lweFourier, nto leyo ebangela ukwakheka komqadi weBessel emva kwelensi. Umgama wokusasazeka ongadibaniyo i-Zmax unxulumene nobubanzi be-d ye-annular slit kunye ne-numerical aperture yelensi.
Nangona le ndlela inokuvelisa imisebe yeBessel engacwangciswanga kakuhle, ukusebenza kakuhle kokuguqulwa kwamandla kuphantsi kakhulu, okwenza kube nzima ukuyisebenzisa kwiindawo zokucubungula nge-laser.
Indlela yeSpatial Light Modulator: Inkqubo yokuvelisa umqadi weBessel olandelelanayo yinkqubo yokutshintsha ukusasazwa kwesigaba somqadi. Ke ngoko, umqadi weBessel olandelelanayo ungaveliswa kusetyenziswa i-spatial light modulator. I-spatial light modulator luhlobo lwesixhobo se-optoelectronic modulation esilawula ubunzulu bentsimi yokukhanya kunye nokusasazwa kwesigaba ngokusebenzisa imiqondiso yombane. Umqadi weBessel olandelelanayo ungaveliswa ngokusebenzisa i-conical lens phase, njengoko kubonisiwe kumfanekiso ongezantsi, kwiphaneli yokusebenza ye-spatial light modulator.
Indlela ye-Axicon: I-axicon yenye yezona zinto zisetyenziswa kakhulu kwiglasi engasebenziyo esekwe kwi-diffractive ukuvelisa imisebe yeBessel. Xa umqadi weGaussian uhlala uvuliwe kwaye udlula kwi-axicon, usasazo lwawo lwesigaba luyaguqulwa, luwuguqule ube ngumqadi weBessel ongekho ngokulandelelana ngaphandle kokulahleka kwamandla, njengoko kubonisiwe kumfanekiso ongezantsi.
Ngenxa yexabiso eliphantsi, ukulula kokusetyenziswa, kunye nomngcipheko ophezulu womonakalo we-laser wee-axicons zeglasi, kunye nokusebenza kwazo kwamandla okuphezulu kakhulu, ii-axicons zezona zikhetho ziphambili zokuvelisa imisebe yeBessel ye-pulse emfutshane kakhulu kwicandelo lokucubungula i-laser. Umfanekiso ongezantsi ubonisa isicwangciso sokuncitshiswa kwe-beam kunye nokudluliselwa kwe-bessel beam engacwangciswanga. Ngokulungisa ukwandiswa kunye nokuqondisa kwenkqubo ye-4f yokufota, umgama wokusasazeka ongengowokusasazeka, i-engile ye-half-cone, kunye ne-engile yokuthambeka kwicala lokusasazeka kwe-bessel beam zinokulawulwa ngokulula.
Xa umqadi weBessel olandelelanayo ongu-zero one-engile yesiqingatha sekhowuni ye-Ɵ1 kunye nomgama wokusasazeka ongena-diffraction we-Zmax udlula kwinkqubo ye-4f eyenziwe yilensi (L1) kunye nelensi ejolise (L2), ubukhulu bejometri buya kucinezelwa ngakumbi. Ukwandiswa kwecala kumalunga ne-M=f1/f2=5, kwaye ukwandiswa kwe-longitudinal kumalunga ne-M2=25. Ngoko ke, umfanekiso wokugqibela we-zero-order Bessel beam ngaphakathi kwesampuli unokumelwa ziiparameter zejometri:
Iiparameter zejiyometri zeBessel beam ezithathwe ngaphakathi kwisampulu yeglasi yequartz phantsi kwee-engile ezahlukeneyo zekhowuni kunye nokwandiswa koxinzelelo lwebham.
| i-engile ye-axial apex α (°) | Irediyasi yomqadi wokufaka d(mm) | (um) | M=f1/f2 | Ɵ2 (°) | I-Zmax2 | |
| 0.5 | 3.8 | 1.03 | 20 | 3.1 | 3504 | 10.04 |
| 0.5 | 3.8 | 1.03 | 30 | 4.7 | 1555 | 6.7 |
| 0.5 | 3.8 | 1.03 | 40 | 6.2 | 873 | 5.02 |
| 0.5 | 3.8 | 1.03 | 50 | 7.8 | 558 | 4.02 |
| 1 | 3.8 | 1.03 | 20 | 6.2 | 1747 | 5.02 |
| 1 | 3.8 | 1.03 | 30 | 9.3 | 772 | 3.36 |
| 1 | 3.8 | 1.03 | 40 | 12.4 | 432 | 2.52 |
| 1 | 3.8 | 1.03 | 50 | 15.5 | 274 | 2.04 |
| 2.5 | 3.8 | 1.03 | 20 | 15.5 | 684 | 2.04 |
| 2.5 | 3.8 | 1.03 | 30 | 23.3 | 294 | 1.38 |
| 2.5 | 3.8 | 1.03 | 40 | 38.83 | 94.4 | 0.86 |
Ukusasazwa kobunzulu bentsimi yokugxila kweBessel beam
- r kunye no-z: Izixhobo ze-Radial kunye ne-axial coordinate, ngokulandelelanayo.
- λ: Ubude be-wavelength obuphakathi kweleza.
- w: 1/e² radius yesiganeko seGaussian beam.
- P0: Amandla aphezulu e-laser ye-pulse emfutshane kakhulu.
- β1: I-engile yesiqingatha sekhowuni yomqadi weBessel emva kokucinezelwa komqadi.
- k: Ivektha yamaza.
- J0: Umsebenzi weBessel ongekho myalelo uphezulu.
Ukusasazwa kobunzulu bomqadi weBessel ongekho myalelo ngaphakathi kwiglasi ye-quartz: Ngasekhohlo kukho ukusasazwa kobuninzi bamandla okukhanya ecaleni kwendlela yokusasazeka kunye nombono onqamlezileyo, kwaye ngasekunene kukho ukusasazwa kobuninzi bamandla okukhanya ecaleni kwe-axis kunye nombono onqamlezileyo.
2. Iimpawu zeFemtosecond Pulse Bessel Beam kwiFused Silica Glass
Umfanekiso (a) ubonisa ii-micrographs zonxibelelwano phakathi kwe-femtosecond pulse Bessel beams kunye ne-fused silica glass kumandla ahlukeneyo e-pulse. Ububanzi be-laser pulse buqiniswe kwi-220 fs, kwaye i-engile ye-half-cone ye-Bessel beam ngaphakathi kwesampuli yi-12.4°. Kunokubonwa ukuba ummandla ochaphazelekileyo yi-laser ubonisa isakhiwo esiqhelekileyo somgca omnye. Xa amandla e-laser pulse engaphantsi kwe-9.5 μJ, i-refractive index yezinto ezikwi-focal region iyanda, ibonakala njengommandla omnyama kwi-micrograph.
Xa amandla e-laser pulse edlula i-9.5 μJ, i-refractive index yezinto ezikwi-focal region iyancipha, ibonakala njenge-white region kwi-micrograph, kwaye ubude be-white region buyanda ngokwanda kwamandla e-pulse. Ngokupolisha isampuli, siqaphele iimpawu ze-morphological ze-white region kwi-pulse energy ye-15.4 μJ phantsi kwe-scanning electron microscope, njengoko kubonisiwe kuMfanekiso (b). Kungagqitywa kwelokuba i-nanopore enobubanzi obumalunga ne-200 nm yenziwa kwi-region ene-refractive index enciphisiweyo.
Ngokusebenzisa iinkqubo zokujonga i-ion beam kunye neenkqubo zokujonga i-electron microscope ezikwi-situ scanning, siqinisekisile ngakumbi ukuba kukho i-nanopore (Umfanekiso c). Ke ngoko, ukuze kuncitshiswe ukuveliswa kweziphene ezibangelwa yi-laser, amandla e-single pulse akufuneki adlule kwi-9.5 μJ ngexesha lokuwelda nge-laser.
3. Ukufezekisa i-Micro-Welding ekumgangatho ophezulu phakathi kweeGlasi zeSilica eziDityanisiweyo kusetyenziswa iBessel Ultrashort Pulse Laser.
Umfanekiso (a) ubonisa i-micrograph ejonge phezulu yomphezulu we-welding yesampuli. Kuyabonakala ukuba umgca we-laser weld uyafana kwaye ugudile. Nangona kusekho iziphene ezimbalwa ze-micropore ezisasazwe ngokungacwangciswanga kwindawo edibeneyo, iyonke, ingcono kakhulu kunomgca we-laser weld weld weGaussian. Umlinganiselo ubonisa ukuba ububanzi bomgca we-weld bumalunga ne-18 μm, kwaye isithuba phakathi kwemigca ye-weld yi-40 μm. Umfanekiso (b) ubonisa i-micrograph ejonge ecaleni yomgca we-weld wesampuli.
Kuyabonakala ukuba umsantsa phakathi kweesampuli uyanyamalala ngokupheleleyo emva kokucutshungulwa nge-laser, kwaye izinto ezikufutshane ne-interface zidityaniswe zibe yinto enye emva kokuba zidlule kwinkqubo yokupholisa ukunyibilika kobushushu. Ukulinganisa kubonisa ukuba ubunzulu bendawo yokunyibilika kobushushu ebangelwa yi-laser bufikelela kwi-227 μm. Oku kubonisa ukuba ngexesha lokucutha nge-laser ngezi parameters, ubunzulu be-axial yendawo egxile kuyo bunokufikelela kwi-227 μm, obuphindwe kane kunobucutha nge-laser ye-Gaussian phantsi kweemeko ezifanayo.
4. Ungazithenga phi iilensi zeBessel?
I-Wavelength Opto-Electronic inikezela ngeelensi zeBessel ezikumgangatho ophezulu ezisetyenziswa kwizicelo zokucubungula nge-laser. Ukulungiswa kobunzulu bokugxila komqadi wokuphuma ngokulungelelanisa ubungakanani bobubanzi bomqadi wokungenisa lolona phawu lukhangayo lwale nkqubo ye-optical yeBessel beam.
| Inombolo yeCandelo | Ubude bamaza (nm) | Umgama Wokusebenza (mm) | Ububanzi boMqadi wokufaka obuphezulu (mm) | Ubunzulu Bokugxila Obuyilwe (mm) | Ubude obupheleleyo (mm) |
|---|---|---|---|---|---|
| I-BESL-355-D10-T1 | 355 | 15.50 | 10 | 1.0 | 377.00 |
| I-BESL-532-10-D10 | 532 | 11.86 | 10 | 1.5 | 202.84 |
| I-BESL-1064-D10-T2 | 1064 | 10.80 | 10 | 2.0 | 238.00 |
| I-BESL-1064-D20-T12 | 1064 | 15.00 | 20 | 12.0 | 315.05 |
Ixesha leposi: Oktobha-10-2024