Te mana teitei femtosecondtaiahohe nui te uara tono i roto i te rangahau putaiao me nga mara ahumahi penei i te whakatipuranga terahertz, te whakangao hiko attosecond me te heru auau whatu.Ko nga lasers kua tutakina e te modi runga i nga purongo poraka-taonga tuku iho ka whakawhäitihia e te whakapänga arotahi waiariki i te mana teitei, a, i tënei wä ko te 20 W te teitei o te mana whakaputa.
Ka whakamahia e te taiaho pepa angiangi te hanganga papu maha-paahi hei whakaata i terama papuki te pepa whiwhi reo ki te matotoru o te 100 microns mo te kaha nui absorption papu. Ko te mea angiangi rawa atu me te hangarau whakamatao whakamuri ka tino whakaiti i te awe o te awe o te arotahi waiariki me te awe kore raina, ka eke ki te kaha teitei ake o te whakaputanga pumanawa femtosecond.
Ko nga oscillators Wafer me te hangarau aratau-maukati arotahi a Kerr te huarahi matua ki te whiwhi i te whakaputanga taiaho hiko toharite teitei me te whanui puihi i roto i te raupapa o te femtosecond.
FIG. 1 (a) 72 hoahoa hanga whatu me (b) hoahoa tinana o te kōwae papu
He roopu kairangahau mai i te Hainamana Academy of Sciences i hoahoa me te hanga he taiaho pepa kati aratau a Kerr i runga i te waahanga papu 72-ara i hangaia e ia ano, a ka whakawhanakehia he taiaho pepa kati aratau a Kerr me te mana toharite teitei me te kotahi. pūngao pūhiko i Haina.
I runga i te maataapono o te Kerr arotahi aratau-maukati me te tatai hurirua o ABCD matrix, i te tuatahi i tātarihia e te roopu rangahau te ariā aratau maukati o te pereti angiangi a Kerr arotahi aratau aratau-rakau laser, i whakatairite i nga huringa aratau i roto i te resonator i te wa e mahi maukati ana. me te mahi tonu, me te whakapumau ka whakahekehia te radius aratau kōhao i te diaphragm pakeke e neke atu i te 7% i muri i te aratau-maukati.
I muri mai, i aratakina e te kaupapa hoahoa, i hangaia e te roopu rangahau he resonator kua kati aratau a Kerr (FIG. 2) i runga i te waahanga papu 72-ara (FIG.1) i hangaia takitahi e te roopu, a ka whiwhi i te laser pupuhi. putanga ki te mana toharite o 11.78W, te whanui pulse o 245 fs me te pūngao pūhiko kotahi o 0.14μJ i te 72 W wā papu. Ko te whanui o te pupuhi whakaputa me te rereke o te aratau intracavity e pai ana ki nga hua whaihanga.
FIG. 2 Hoahoa hoahoa o te kohanga haruru o te aratau arotahi Kerr kua maukati Yb: YAG wafer laser i whakamahia i roto i te whakamatautau
Hei whakapai ake i te mana whakaputa o te taiaho, i whakanuia e te roopu rangahau te radius curvature o te whakaata arotahi, me te whakatika i te matotoru reo Kerr me te marara tuarua. I te wa i whakaturia ai te mana papu ki te 94 W, kua piki ake te mana whakaputa toharite ki te 22.33 W, a ko te whanui o te pupuhi he 394 fs me te kaha o te pupuhi kotahi ko 0.28 μJ.
Hei whakanui ake i te mana whakaputa, ka whakapiki ake te roopu rangahau i te radius curvature o te takirua whakaata concave arotahi, i te whakanoho i te resonator ki roto i te waahi kati korehau iti ki te whakaiti i te awe o te awangawanga o te hau me te marara o te hau.
Wā tuku: Akuhata-15-2023