Hei whakarewa i ngā rauemi i ngā taha e rua o te atanga i te wā kotahi, hei whakatū hoki i tētahi hononga rohe-iti kaha-teitei, me arotahi tika te pūwāhi arotahi taiaho ki te tauira, ka nui te tono mō te tika o te tukatuka o te pūnaha whakarewa. Hei tāpiri, nā te nui o te pikinga kaha tuaka o te hihi Gaussian i muri i te arotahi, kāore i te ōrite te pāmahana o te mara arotahi, ka ngāwari ai te hanga i ngā hapa moroiti me te nano-kore i roto i te rohe e pāngia ana e te taiaho, ka pā ki te kounga whakarewa o te tauira.
Ka taea te whakamahi i te hangarau hanga mārama ā-wāhi hei whakaputa i ngā hihi Bessel kore-ōrite hei arotau i te tohatoha kaha o te papa arotahi laser. Ka whakaitihia e tēnei huarahi te pikinga kaha tuaka, ka whakaroahia hoki te roa arotahi, ā, ka whakanuia te ōwehenga hohonu-ki-te-whānui o te rohe pānga wera i hangaia e te laser. Nō reira, ka whakaitihia ngā whakaritenga tika arotahi o te pūnaha whakarewa laser, ka whakapai ake i te kounga me te whai huatanga o te whakarewa.
1. Te Whakaputa me te Hoahoa Tawhā o ngā Kurupae Bessel Kore-Whakarerekē
I te tau 1987, i whakaarohia tuatahitia e Durnin te hihi Bessel ota-kore, e whakaatu ana i ngā āhuatanga ahurei kāore e horapa: kāore e rerekē te tohatoha o te kaha o te mara mārama whakawhiti i te wā e horapa ana, ā, ko te rahi o te ira waenga e tata tonu ana ki te rohe horapa. Hei tāpiri, he āhuatanga whakaora-ake anō hoki ngā hihi Bessel i te wā e horapa ana. Ina āraia te ira waenga, ka huihui te mārama e karapoti ana ki te pokapū ki te "whakatika" i te ira waenga. Ko te kīanga pāngarau mō te tohatoha mara mārama whakawhiti o te hihi Bessel ota-kore ko:
I roto i te kīanga:
- E tohu ana a J0 i te mahi Bessel raupapa-kore.
- Ko r me φ ngā huānga taunga radial me te koki.
- Ko z te tawhiti horapa.
- Ko Kr me Kz ngā huānga kawe ngaru whakawhiti me ngā huānga kawe ngaru roa.
He kaha te kaha o te pūwāhi matua o te kurupae Bessel ota-kore ki te pupuri i te hihi, e āhei ai te horapa o te hihi ki te TW/cm², neke atu rānei, ka taea ai te whakaoho i te mimiti kore-raina ki roto i ngā rauemi. He mea nui ake, ko te āhuatanga horapa kore-whakarerekē o ngā kurupae Bessel ota-kore e whakarato ana i te hohonutanga o te arotahi me te iti ake o te kaha o te tuaka, ā, ka hangaia he āpure pāmahana tata rite, ka pehi hoki i te hanganga o ngā hapa whakarewa.
E whakaatu ana te pikitia e whai ake nei i te whakatairite i te roa o te arotahi o ngā hihi Bessel me ngā hihi Gaussian i raro i te kaha here whakawhiti kotahi. He hohonu te arotahi o ngā hihi Bessel, engari e mau tonu ana te diameter o te ira arotahi taumata-micron whakawhiti.
He maha ngā tikanga mō te whakaputa i ngā kurupae Bessel kore-ōrite, ā, e toru ngā tikanga matua e wātea ana:
Tikanga Pūwero Āwhata: Ko te tikanga pūwero āwhata, e ai ki te ingoa, ko te whakamahi i tētahi pūwero āwhata hei whakaputa i ngā hihi Bessel. Koinei anō te tikanga angitu tuatahi mō te whakaputa hihi Bessel. Kei te whakaatu te hoahoa i raro nei i te tikanga pūwero āwhata hei whakaputa hihi Bessel. Ka pā te ngaru papatahi ki te pūwero āwhata mai i te taha maui, ā, ka puta te whakarara.
Muri iho, ka mahi te arotahi pai i te panoni Fourier, ka hua ake he hihi Bessel i muri i te arotahi. Ko te tawhiti horapa kore-whakarara Zmax e pā ana ki te diameter d o te kohao porowhita me te pūaha tau o te arotahi.
Ahakoa ka taea e tēnei tikanga te whakaputa i ngā hihi Bessel kore-ōrite, he tino iti te whai huatanga o te tahuritanga pūngao, ā, he uaua ki te whakamahi i roto i ngā mara tukatuka taiaho.
Tikanga Whakarerekētanga Mārama Ā-Wāhi: Ko te tukanga whakaputa o te hihi Bessel kore-ōrite he tukanga whakarerekē i te tohatoha ā-wāhanga o te hihi. Nō reira, ka taea hoki te whakaputa i te hihi Bessel kore-ōrite mā te whakamahi i te kaiwhakarerekētanga mārama ā-wāhi. Ko te kaiwhakarerekētanga mārama ā-wāhi he momo taputapu whakarerekētanga hikohiko e whakahaere ana i te kaha o te mara mārama me te tohatoha ā-wāhanga mā roto i ngā tohu hiko. Ka taea te whakaputa i te hihi Bessel kore-ōrite mā te whakamahi i te ā-wāhanga arotahi kōniko, e whakaaturia ana i te ahua i raro nei, ki te papa mahi o te kaiwhakarerekētanga mārama ā-wāhi.
Tikanga Axicon: Ko te axicon tētahi o ngā huānga whakarara e whakamahia whānuitia ana mō te whakaputa i ngā hihi Bessel. Ina pā te hihi Gaussian ki runga, ā, ina haere mā roto i te axicon, ka whakarerekētia tōna tohatoha āhuahanga, ka hurihia hei hihi Bessel kore-ōta me te kore he ngaronga pūngao, e whakaaturia ana i te pikitia i raro nei.
Nā te iti o te utu, te ngāwari o te whakamahi, me te paepae kino teitei o te taiaho o ngā axicon karāhe, me te tino pai o te whakamahinga pūngao, ko ngā axicon te whiringa matua mō te whakaputa i ngā hihi Bessel poto rawa i roto i te mara o te tukatuka taiaho. E whakaatu ana te ahua i raro nei i tētahi mahere o te whakawhāititanga me te tuku hihi o tētahi hihi Bessel kore-ōta. Mā te whakarerekē i te whakanui me te whakatakotoranga o te pūnaha whakaahua 4f, ka taea te whakahaere ngāwari i te tawhiti horapa kore-whakawhiti, te koki haurua-kōne, me te koki honga i te ahunga horapa o te hihi Bessel.
Ina haere tētahi hihi Bessel kore-ōrite me te koki haurua-kōne o Ɵ1 me te tawhiti horapa kore-whakawhiti o Zmax mā roto i tētahi pūnaha 4f e titoa ana e tētahi karu arotahi (L1) me tētahi karu arotahi (L2), ka pēhia ake ngā āhua āhuahanga. Ko te whakanui taha tata ki te M=f1/f2=5, ā, ko te whakanui roa tata ki te M2=25. Nō reira, ko te whakaahua whakamutunga o te hihi Bessel kore-ōrite i roto i te tauira ka taea te whakaatu mā ngā tawhā āhuahanga:
Ngā tawhā āhuahanga o te kurupae Bessel i whakaahuahia i roto i te tauira karāhe kuata i raro i ngā koki kōne rerekē me ngā whakanuinga kōpeketanga kurupae.
| koki tihi tuaka α (°) | Te pūtoro o te hihi tāuru 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 |
Te tohatoha kaha o te mara arotahi o te hihi Bessel
- r me z: Ngā wāhanga taunga pūtoro me te tuaka.
- λ: Te roanga ngaru waenga o te taiaho.
- w: 1/e² te pūtoro o te hihi Gaussian e tau ana.
- P0: Te kaha tino kaha o te taiaho pakū poto rawa.
- β1: Koki haurua-kōne o te kurupae Bessel i muri i te pēhitanga kurupae.
- k: Te whārite ngaru.
- J0: Mahi Bessel raupapa-kore.
Te tohatoha kaha o te hihi Bessel kore-ōrite i roto i te karāhe quartz: Kei te taha maui ko te tohatoha kiato mana whatu i te ahunga horapa me te tirohanga whakawhiti-wāhanga, ā, kei te taha matau ko te tohatoha kiato mana whatu i te taha o te tuaka me te tirohanga whakawhiti-wāhanga.
2. Ngā Āhuatanga o te Kurupae Bessel Femtosecond Pulse i roto i te Karāhe Silica Whakakotahi
E whakaatu ana te Pikitia (a) i ngā kauwhata iti o te taunekeneke i waenga i ngā hihi Bessel pātī femtosecond me te karāhe silica kua hanumi i ngā kaha pātī rerekē. Ko te whānui o te pātī laser kua whakaritea ki te 220 fs, ā, ko te koki haurua-kōne o te hihi Bessel i roto i te tauira he 12.4°. Ka kitea ko te rohe e pāngia ana e te laser he hanganga raina kotahi-ahu noa iho. Ina iti iho te kaha pātī laser i te 9.5 μJ, ka piki ake te taupū whakaata o te rauemi i roto i te rohe arotahi, ka puta hei rohe pango i roto i te kauwhata iti.
Ina neke atu te kaha o te pā o te taiaho i te 9.5 μJ, ka heke te taupū whakaata o te rauemi i te rohe arotahi, ka puta hei rohe mā i roto i te maikorohi, ā, ka piki ake te roa o te rohe mā i te pikinga o te kaha pā. Mā te whakakanapa i te tauira, i kitea e mātou ngā āhuatanga āhua o te rohe mā i te kaha pā o te 15.4 μJ i raro i te karu hiko matawai, e whakaaturia ana i te Pikitia (b). Ka taea te whakatau ko te nanopore me te diameter o te 200 nm pea ka hangaia i roto i te rohe me te taupū whakaata kua whakaitihia.
Mā te whakairo hihi katote me ngā pūnaha tirotiro karu hiko matawai in-situ, i whakaūhia e mātou te aroaro o te nanopore (Pikitia c). Nō reira, hei whakaiti i te whakaputanga o ngā hapa i puta mai i te laser, kaua te kaha pā kotahi e neke ake i te 9.5 μJ i te wā e whakarewahia ana te laser.
3. Te Whakatutuki i te Whakarewatanga Iti-Kounga-Teitei i waenga i ngā Mōhiti Silica Kua Whakakotahitia mā te whakamahi i te Bessel Ultrashort Pulse Laser.
E whakaatu ana te Pikitia (a) i tētahi kauwhata iti tirohanga-runga o te mata whakarewa o te tauira. Ka kitea he ōrite, he maeneene hoki te rārangi whakarewa reera. Ahakoa he iti noa ngā hapa o ngā pore iti kua tohatoha matapōkeretia i roto i te wāhi whakarewa, i te nuinga, he pai ake i te rārangi whakarewa reera Gaussian. E whakaatu ana ngā inenga ko te whānui o te rārangi whakarewa he tata ki te 18 μm, ā, ko te mokowā i waenga i ngā rārangi whakarewa he 40 μm. E whakaatu ana te Pikitia (b) i tētahi kauwhata iti tirohanga-taha o te rārangi whakarewa o te tauira.
Ka kitea te ngaro katoa o te āputa i waenga i ngā tauira i muri i te tukatuka taiaho, ā, kua hanumi te rauemi e tata ana ki te atanga hei mea kotahi i muri i te tukanga rewa-whakamatao wera. E whakaatu ana ngā inenga ko te hohonutanga o te rohe rewa wera i puta mai i te taiaho ka eke ki te 227 μm. E tohu ana tēnei i te wā e whakarewa taiaho ana me ēnei tawhā, ka taea e te hohonutanga tuaka o te tūranga arotahi te eke ki te 227 μm, e whā ngā wā o te whakarewa taiaho Gaussian i raro i ngā āhuatanga ōrite.
4. Kei hea te hoko i ngā karu arotahi Bessel?
Ka tukuna e te Wavelength Opto-Electronic ngā karāhe Bessel kounga teitei e whakamahia ana i roto i ngā tono tukatuka laser. Ko te whakarerekētanga o te hohonutanga o te arotahi o te hihi putanga mā te whakarerekē i te rahi o te diameter o te hihi whakauru te āhuatanga tino ātaahua o tēnei pūnaha whatu hihi Bessel.
| Wāhanga Nama | Roangaru (nm) | Tawhiti Mahi (mm) | Te Diamita o te Kurupae Whakauru Mōrahi (mm) | Te Hōhonutanga o te Arotahi i Hoahoahia (mm) | Te Roa Katoa (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 |
Wā tuku: Oketopa-10-2024