Tirohanga whānui ongā taiaho pupuhi
Ko te huarahi tino tika ki te whakaputarēseriKo te tikanga o ngā pātere ko te tāpiri i tētahi pūwhakatikatika ki waho o te taiaho tonu. Ka taea e tēnei tikanga te whakaputa i te pātere picosecond tere rawa atu, ahakoa he māmā noa iho, engari kāore e taea e te pūngao mārama moumou me te mana tihi te hipa i te mana mārama tonu. Nō reira, ko tētahi huarahi whai hua ake ki te whakaputa pātere taiaho ko te whakarerekē i roto i te kōhao taiaho, te penapena pūngao i te wā kore o te tereina pātere me te tuku i te wā tika. Ko ngā tikanga e whā e whakamahia ana hei whakaputa pātere mā te whakarerekētanga kōhao taiaho ko te whakawhiti whakanui, te whakawhiti-Q (whakawhitinga ngaronga), te whakawātea kōhao, me te raka-aratau.
Ka whakaputa te pana whakanui i ngā pātere poto mā te whakarerekē i te mana papu. Hei tauira, ka taea e ngā taiaho whakawhiti-whakanui haurua-haurua te whakaputa pātere mai i ētahi nanohekona ki te rau pikohekona mā te whakarerekētanga o te iahiko. Ahakoa he iti te kaha o te pātere, he tino ngāwari tēnei tikanga, pērā i te whakarato i te auau whakahoki whakarerekētanga me te whānui o te pātere. I te tau 2018, i kōrero ngā kairangahau i Te Whare Wānanga o Tōkyō mō tētahi taiaho whakawhiti-whakanui femtohekona, e tohu ana i tētahi putanga hou i roto i te aukati hangarau 40-tau.
Ko ngā pāoro nanohekona kaha ka whakaputaina e ngā taiaho whakawhiti-Q, e tukuna ana i roto i ngā haerenga porowhita maha i roto i te kōhao, ā, ko te kaha pāoro kei roto i te awhe o te maha mirijoule ki te maha joule, i runga i te rahi o te pūnaha. Ko ngā pāoro picohekona me ngā pāoro femtohekona kaha waenga (i raro iho i te 1 μJ) ka whakaputaina e ngā taiaho raka-aratau. Kotahi, neke atu rānei ngā pāoro poto rawa i roto i te resonator taiaho e huri haere tonu ana. Ka tukuna e ia pāoro intracovity he pāoro mā te whakaata hononga putanga, ā, ko te auautanga i waenga i te 10 MHz me te 100 GHz. E whakaatu ana te ahua i raro nei i te femtohekona soliton marara noa (ANDi)taputapu muka laser, ko te nuinga o ēnei ka taea te hanga mā te whakamahi i ngā wāhanga paerewa a Thorlabs (muka, arotahi, whakairinga me te ripanga nekehanga).
Ka taea te whakamahi i te tikanga whakakore poka mōNgā taiaho whakawhiti-Qhei whiwhi i ngā pāoro poto ake me ngā taiaho maukati-aratau hei whakanui ake i te pūngao pāoro me te auau iti iho.
Ngā pātere rohe wā me te rohe auau
Ko te āhua rārangi o te pāorooro i te wā he tino māmā noa iho, ā, ka taea te whakaatu mā roto i ngā mahi Gaussian me te sech². Ko te wā pāorooro (e mōhiotia ana ko te whānui pāorooro) ka whakaaturia whānuitia mā te uara whānui haurua-teitei (FWHM), arā, ko te whānui e tata ana te mana whatu ki te haurua o te mana tihi; ka whakaputahia e te taiaho Q-switched ngā pāorooro poto nanohekona mā roto
Ka whakaputahia e ngā taiaho aratau-raka ngā pāoro poto rawa (USP) i roto i te raupapa o ngā tekau pikohekona ki ngā femtohekona. Ka taea e ngā hikohiko tere-rahi te ine tae atu ki ngā tekau pikohekona, ā, ko ngā pāoro poto ake ka taea anake te ine mā te whakamahi i ngā hangarau whatu noa pērā i ngā autocorrelator, FROG me SPIDER. Ahakoa kāore e rerekē te whānui o te pāoro o ngā pāoro nanohekona, roa ake rānei i a rātou e haere ana, ahakoa i ngā tawhiti roa, ka pāngia ngā pāoro poto rawa e ngā momo āhuatanga:
Ka taea e te marara te hua ake he whānui nui o te pāorooro, engari ka taea te pēhi anō mā te marara ke. E whakaatu ana te hoahoa e whai ake nei me pēhea te utu a te pūhiko pāorooro femtosecond a Thorlabs mō te marara karuārai.
Ko te kore-raina kāore e pā tika ki te whānui o te pāorooro, engari ka whānui ake te whānui o te aho, ka ngawari ake te pāorooro ki te horapa i te wā e horapa ana. Ka taea e tetahi momo muka, tae atu ki ētahi atu pāpāho whakanui me te whānui iti, te pā ki te āhua o te whānui, te pāorooro poto rawa rānei, ā, mā te hekenga o te whānui ka whānui ake i te wā; Tērā anō hoki ētahi wā ka poto ake te whānui o te pāorooro o te pāorooro kaha ina whaiti haere te whānuitanga o te hihi.
Te wā tuku: Hui-tanguru-05-2024