Kuti zvinhu zvose zviri kumativi ese einterface zvinyungudutswe panguva imwe chete uye zvigadzire chisungo che micro-region chakasimba, nzvimbo ye laser inofanira kunge yakatarisana nemuenzaniso, izvo zvinoita kuti pave nekukosha kwakasimba pakugadzirisa system ye welding. Pamusoro pezvo, nekuda kwehukuru hwe axial intensity gradient yeGaussian beam mushure mekutarisa, tembiricha ye focal field haina kuenzana, zvichiita kuti ive nyore kugadzira zvikanganiso zve micro- uye nano-void munzvimbo ine laser, izvo zvinokanganisa kunaka kwe welding yemuenzaniso.
Tekinoroji yekugadzira chiedza cheSpatial inogona kushandiswa kugadzira mwenje weBessel we zero-order kuti iwedzere kupararira kwesimba relaser focal field. Nzira iyi inoderedza axial intensity gradient uye inowedzera urefu hwefocal, nokudaro ichiwedzera chiyero chekudzika kusvika paupamhi chenzvimbo yekupisa inoumbwa nelaser. Nekuda kweizvozvo, inoderedza zvinodiwa zve focus accuracy zve laser welding system, zvichivandudza kunaka kwe welding uye kushanda zvakanaka.
1. Kugadzirwa uye Kugadzirwa kweMapuratifomu eBessel Beams Asingakanganisike
Muna 1987, Durnin akatanga kupa zano rekuti danda reBessel rine zero-order, iro rinoratidza hunhu hwaro husingachinji: kupararira kwaro kwesimba rechiedza chinochinjika hakuchinji panguva yekupararira, uye saizi yenzvimbo iri pakati inogara iri pedyo nemuganhu wekupararira. Pamusoro pezvo, matanda eBessel anoratidzawo hunhu hwekuzviporesa panguva yekupararira. Kana nzvimbo iri pakati yavharwa, chiedza chakakomberedza chinobatana chichienda pakati kuti "chigadzirise" nzvimbo iri pakati. Masvomhu ekupararira kwenzvimbo iri pakati pechiedza chinochinjika chedanda reBessel rine zero-order ndeinotevera:
Mukutaura kwacho:
- J0 inomiririra basa reBessel re zero-order.
- r na φ zvinhu zvinoumba radial ne angular coordinate, zvichiteerana.
- z ndiyo daro rekupararira.
- Kr naKz zvinhu zvinotenderera uye zvinotenderera, zvichiteerana.
Nzvimbo huru yedanda reBessel rine zero-order ine kugona kwakasimba kwekuvharira, zvichibvumira mwero wemwaranzi weTW/cm² kana kupfuura, izvo zvinogona kukurudzira kunyudzwa kwezvinhu zvisina kurongeka. Chinonyanya kukosha ndechekuti, hunhu hwekuparadzira husingachinji hwedanda reBessel rine zero-order hunoita kuti pave nekudzika kukuru kwekutarisa uye gradient diki ye axial intensity, nokudaro zvichigadzira nzvimbo yekupisa yakafanana uye zvinodzvinyirira kuumbwa kwezvikanganiso zve welding.
Mufananidzo unotevera unoratidza kuenzanisa kureba kwematanda eBessel neGaussian pasi pekugona kuchinjika kwakafanana. Matanda eBessel ane kudzika kwakadzika kwekutarisa uku achichengetedza dhayamita yenzvimbo yekutarisa inochinjika ye micron-level.
Kune nzira dzakasiyana siyana dzekugadzira matanda eBessel asina kurongeka, uye nzira nhatu huru dzinotevera dzakajairika:
Nzira yeAperture yeAnnular: Nzira yeAperture yeannular, sezvinoreva zita racho, inosanganisira kushandisa annular slit kugadzira Bessel beams. Iyi ndiyo yaivewo nzira yekutanga yakabudirira yekugadzira Bessel beams. Dhayagiramu iri pazasi inoratidza nzira yeAperture yeannular yekugadzira Bessel beams. Mafungu emuchadenga anowira zvakananga paannular slit kubva kuruboshwe uye diffraction inoitika.
Mushure mezvo, lenzi yakanaka inoita shanduko yeFourier, zvichikonzera kuumbwa kwedanda reBessel riri kumashure kwelenzi. Kureba kwekuparadzira kusingachinjiki kweZmax kwakabatana nedhayamita d yemupendero weannular uye kuvhurika kwenhamba kwelenzi.
Kunyangwe nzira iyi ichigona kugadzira mwenje weBessel usina kurongeka, kushanda nesimba kwekushandura simba kwakaderera zvikuru, zvichiita kuti zviome kushandisa muminda yekugadzira laser.
Nzira yeSpatial Light Modulator: Kugadzira danda reBessel rine zero-order inzira yekuchinja kugoverwa kwedanda. Nokudaro, danda reBessel rine zero-order rinogona kugadzirwawo uchishandisa spatial light modulator. Spatial light modulator rudzi rwe optoelectronic modulation device inodzora simba remunda wechiedza nekugoverwa kwechikamu kuburikidza nemasaini emagetsi. Zero-order Bessel beam inogona kugadzirwa nekushandisa conical lens phase, sezvakaratidzwa mumufananidzo uri pazasi, kune working panel ye spatial light modulator.
Nzira yeAxicon: Axicon ndeimwe yezvinhu zvinonyanya kushandiswa zvinoburitsa magirazi pakugadzira matanda eBessel. Kana danda reGaussian rikagara richingoerekana rapinda uye richipfuura nepakati peaxicon, kugoverwa kwaro kwechikamu kunogadziriswa, kuchichinja kuita danda reBessel risina kurongeka pasina kurasikirwa nesimba, sezvakaratidzwa mumufananidzo uri pazasi.
Nekuda kwemutengo wakaderera, nyore kushandisa, uye muganhu wekukuvara kwegirazi remagirazi, pamwe nekushandisa simba rakawanda, magirazi emagirazi ndiwo sarudzo huru yekugadzira mwenje weBessel we ultrashort pulse mumunda we laser processing. Mufananidzo uri pazasi unoratidza schematic yekutetepa kwedanda uye kutumirwa kwedanda reBessel risina kurongeka. Nekugadzirisa kukura uye kurongeka kwe4f imaging system, daro risingachinjiki rekuparadzira, angle yehafu-koni, uye angle yekutsvedza munzira yekupararira kwedanda reBessel zvinogona kudzorwa zviri nyore.
Kana danda reBessel rine angle yehafu yekoni ye Ɵ1 uye daro reZmax risina diffraction richipfuura nepakati pe 4f system ine lenzi (L1) uye lenzi ine chinangwa (L2), zviyero zve geometric zvichawedzerwa kudzvanywa. Kukura kwedivi kunenge kuri M=f1/f2=5, uye kukura kwenguva refu kunenge kuri M2=25. Saka, mufananidzo wekupedzisira wedanda reBessel rine order yezero mukati memuenzaniso unogona kumiririrwa nema parameter e geometric:
Zviyero zvejometri zvedanda reBessel zvakaratidzwa mukati memuenzaniso wegirazi requartz pasi pemakona akasiyana ekoni uye kukura kwekumanikidzwa kwedanda.
| kona ye axial apex α (°) | Radiyo yedanda rekuisa d(mm) | (um) | M=f1/f2 | Ɵ2 (°) | 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 |
Kupararira kweBessel beam muchikamu chekutarisa simba remumunda
- r na z: Zvikamu zveRadial neaxial coordinate, zvichiteerana.
- λ: Hurefu hwepakati hwelaser.
- w: 1/e² radius yegwara reGaussian rakaitika.
- P0: Simba guru re laser yekurova kwemoyo pfupi.
- β1: Kona yehafu yekoni yedanda reBessel mushure mekumanikidzwa kwedanda.
- k: Vekitari yemafungu.
- J0: Basa reBessel risina kurongeka.
Kupararira kwesimba reBessel beam re zero-order mukati megirazi re quartz: Kuruboshwe kune kugoverwa kwesimba re optical pamwe negwara rekupararira uye maonero e cross-sectional, uye kurudyi kune kugoverwa kwesimba re optical pamwe ne axis uye maonero e cross-sectional.
2. Hunhu hweFemtosecond Pulse Bessel Beam muFused Silica Glass
Mufananidzo (a) unoratidza ma micrograph ekubatana pakati pe femtosecond pulse Bessel beams ne fused silica glass pamasimba akasiyana e pulse. Upamhi hwe laser pulse hwakagadzika pa 220 fs, uye angle yehafu yekona yeBessel beam mukati memuenzaniso i 12.4°. Zvinogona kuonekwa kuti nzvimbo yakakanganiswa ne laser inoratidza chimiro chakajairika che one-dimensional linear. Kana laser pulse energy iri pasi pe 9.5 μJ, refractive index yezvinhu zviri mu focal region inowedzera, ichionekwa senzvimbo nhema mu micrograph.
Kana simba rekupisa kwelaser richidarika 9.5 μJ, refractive index yezvinhu zviri munzvimbo yepakati inoderera, zvichionekwa senzvimbo chena mu micrograph, uye kureba kwenzvimbo chena kunowedzera nekuwedzera kwesimba rekupisa. Nekupukuta sampuro, takaona hunhu hwenzvimbo chena pasimba rekupisa re15.4 μJ pasi pe scanning electron microscope, sezvakaratidzwa muMufananidzo (b). Zvinogona kugumiswa kuti nanopore ine dhayamita inosvika 200 nm inoumbwa munzvimbo ine refractive index yakaderedzwa.
Kuburikidza ne ion beam etching uye in-situ scanning electron microscope observation systems, takasimbisa zvakare kuvapo kwe nanopore (Mufananidzo c). Saka, kuti tideredze kugadzirwa kwezvikanganiso zvinokonzerwa ne laser, simba re single pulse harifanirwe kudarika 9.5 μJ panguva ye laser welding.
3. Kuwana Kubatanidza Magirazi Madiki Emhando Yepamusoro Pakati Pemagirazi eSilica Akasanganiswa uchishandisa Bessel Ultrashort Pulse Laser.
Mufananidzo (a) unoratidza micrograph yekumusoro kwenzvimbo yekuwelda yemuenzaniso. Zvinogona kuonekwa kuti mutsetse wekuwelda we laser wakaenzana uye wakatsetseka. Kunyangwe kuchine zvikanganiso zvishoma zve micropore zvakapararira zvisina kurongeka munzvimbo yakawelda, zvakazara, zviri nani zvakanyanya kupfuura mutsetse wekuwelda we laser weld weGaussian. Kuyerwa kunoratidza kuti upamhi hwemutsetse wekuwelda hunenge 18 μm, uye nzvimbo iri pakati pemitsara yekuwelda i40 μm. Mufananidzo (b) unoratidza micrograph yerutivi rwemutsetse wekuwelda wemuenzaniso.
Zvinogona kuonekwa kuti mukaha uri pakati pemasampuli unonyangarika zvachose mushure mekugadziriswa nelaser, uye zvinhu zviri pedyo neinterface zvakabatana kuita chinhu chimwe chete mushure mekuitwa thermal melting-cooling process. Kuyerwa kunoratidza kuti kudzika kwenzvimbo yekunyungudutsa inokonzerwa nelaser kunosvika 227 μm. Izvi zvinoratidza kuti panguva yekuisa laser neaya ma parameter, kudzika kweaxial kwenzvimbo yefocal kunogona kusvika 227 μm, inova yakapetwa kana kupfuura Gaussian laser welding pasi pemamiriro akafanana.
4. Ndekupi Kwaungatenga Magirazi eBessel?
Wavelength Opto-Electronic inopa malenzi eBessel emhando yepamusoro anoshandiswa mukugadzirisa nelaser. Kugona kugadziriswa kwehukuru hwekutarisa kwedanda rekubuda nekugadzirisa saizi yedhayamita yedanda rekupinza ndicho chinhu chinokwezva zvikuru cheiyi Bessel beam optical system.
| Nhamba yeChikamu | Kureba kwewavelength (nm) | Kureba kwekushanda (mm) | Dhiya reMax Input Beam (mm) | Kudzika Kwakagadzirwa Kwekutarisa (mm) | Hurefu Hwose (mm) |
|---|---|---|---|---|---|
| BESL-355-D10-T1 | 355 | 15.50 | 10 | 1.0 | 377.00 |
| BESL-532-10-D10 | 532 | 11.86 | 10 | 1.5 | 202.84 |
| BESL-1064-D10-T2 | 1064 | 10.80 | 10 | 2.0 | 238.00 |
| BESL-1064-D20-T12 | 1064 | 15.00 | 20 | 12.0 | 315.05 |
Nguva yekutumira: Gumiguru-10-2024