Te whakatipuranga-whanui-whanui waenga-pōkākā mā te whakamahi i te karaihe kore-rārangi BGSe

Dr.JINWEI ZHANG me tana roopu e whakamahi ana i te miihini miihini Cr: ZnS e kawe ana i nga pihi 28-fs i te roangaru o te 2.4 µm e whakamahia ana hei puna papu, e akiaki ana i te rereketanga o te rereketanga o te rerekee-a-roto i roto i te karaihe BGSe. I te mutunga, ko te hononga whanui-whanui o te pōkākā waenganui-pōkākā mai i te 6 ki te 18 µm kua riro. E whakaatu ana ko te karaihe BGSe he taonga whakaari mo te aunui, he iti-huringa whakatupuranga waenganui-pōkākā mā te huri auau ki raro me ngā punawai papu femtosecond.

Kupu Whakataki

Maama-pōkākā (MIR) rama i roto i te whānuitanga o 2-20 µm he pai mo te tautuhi i te matū me te koiora na te mea he maha nga raina mimiti ngotahi i tenei rohe kiko. Ko te puna honohono, iti-huringa me te kapi waatea o te whānuitanga o te MIR whanui ka taea ai te tono hou penei i te mirco-spectroscopy, femtosecond papu-probe spectroscopy, me te inenga-hihiko-whanganga inenga tae atu ki tenei wa he maha nga kaupapa.
i hangaia hei whakaputa i te radiation MIR honohono, penei i nga raina kurupae synchrotron, lascade lascade, puna supercontinuum, oscillators parametric optik (OPO) me te ampliciers parametric optik (OPA). Ko enei mahinga he kaha ake, he ngoikore hoki mo te uaua, te bandwidth, te mana, te kaha, me te roa o te pini. I waenga i a raatau, ko te whakatupuranga rerekee rerekee waenga-uaua (IDFG) e kukume ana i te aro mai ki te whanaketanga o te kaha kaha ki te whakamahi i te raima-iti femtosecond 2 µm ka taea te papu i te iti-bandgap kore-waikura karaihe nonlinear kia kaha ai te whakaputa i te raina whanui a te MIR. Ki te whakataurite ki nga OPO me nga OPA e whakamahia ana, ma te IDFG e whakaheke te uaua o te punaha me te whakarei ake i te pono, i te mea ka tangohia te hono kia rua nga hihi motuhake, nga poka ranei kei te tino tika. Ano hoki, ko te putanga MIR he kaikawe-envelope-waahanga (CEP) pumau me IDFG.

Fig 1

Te hihinga whakawhiti o te karaihe BGSe 1-mm-matotoru i hangaia e DIEN TECH. Ko te whakauru e whakaatu ana i te karaihe pono i whakamahia i roto i tenei whakamatautau.

Whakaahua 2

Whakatakotoranga whakamatau o te whakatupuranga MIR me te karaihe BGSe. OAP, whakaata parabolic waho-tuaka me te 20 mm te roa o te arotahi; HWP, pereti hawhe-ngaru; TFP, polarizer kiriata angiangi; LPF, taatari roa-haere.

I te tau 2010, he karaihe koraraumata biaxial hou, BaGa4Se7 (BGSe), i hangaia ma te whakamahi i te tikanga Bridgman-Stockbarger. He whanui te whanui mai i te 0.47 ki te 18 µm (e whakaaturia ana i te Whakaahua 1) me nga whakarea tuuturu o d11 = 24.3 pm / V me d13 = 20.4 pm / V. Ko te matapihi maamaatanga o te BGSe he nui ake te whanui atu i te ZGP me te LGS ahakoa he iti ake i te ZGP (75 ± 8 pm / V) tona koretake. He rereke ki a GaSe, ka taea hoki te tapahia te BGSe i te koki e hangai ana ki te waahanga-e hiahiatia ana ka taea te whakakotahi i te whakaata-whakaata.

Ko te whakaturanga whakamatau e whakaaturia ana i te Whakaahua 2 (a). I hangaia tuatahihia nga paati taraiwa mai i te Kerr-arotahi-aratau-kua tutakina-aratau Cr: oscillator ZnS me te polycrystalline Cr: karaihe ZnS (5 × 2 × 9 mm3, whakawhiti = 15% i te 1908nm) hei taonga whiwhi ma te Taiaho muka-doped muka i 1908nm. Ko te piirangi i roto i te kohao ngaru tuuturu ka tukuna he 45-fs nga pona e mahi ana i te tere tukurua o te 69 MHz me te kaha toharite o te 1 W i te roangaru kawe o 2.4 µm. Ka whakanuihia te mana ki te 3.3 W i roto i te whare-hanga-e rua-waahi-takitahi polycrystalline Cr: ZnS amplifier (5 × 2 × 6 mm3, tuku = 20% i te 1908nm me te 5 × 2 × 9 mm3, whakawhiti = 15% i 1908nm), me te roanga o te puoro putanga ka inea ki te taputapu-hanga-tuarua-a-reanga-a-reanga aukati (SHG-FROG) taputapu whakaraerae.

DSC_0646Whakamutunga

I whakaatuhia e ratau tetahi puna MIR me te karaihe BGSe i runga i te tikanga IDFG. He femtosecond Cr: Ko te punaha laser ZnS i te roangaru o te 2.4 µm i whakamahia hei puna taraiwa, kia taea ai te taupoki kiko kotahi mai i te 6 ki te 18 µm. Ki ta matau mohio, koinei te wa tuatahi i kitea te whakatupuranga whanui a te MIR i roto i te karaihe BGSe. Ko te putanga e tika ana kia iti-te-huringa o te paoho, kia pumau hoki i roto i tana waahanga-kaikawe. Ki te whakataurite ki etahi atu tioata, ko te hua tuatahi me te BGSe e whakaatu ana i te whakatupuranga MIR me te bandwith whanui rite (whanui atu i te ZGP me te LGS) ahakoa he iti te kaha o te kaha me te kaha o te huri. Ko te kaha o te kaha toharite ka taea te whakarite kia nui ake te arotahi ki te rahinga waahi me te matotoru karaihe. Ko te kounga karaihe pai ake me te nui o te paepae kino ka whai hua hoki mo te whakapiki i te kaha toharite o te MIR me te kaha o te huri. E whakaatu ana tenei mahi ko te karaihe BGSe he taonga whakaari mo te aunui, hononga MIR honohono.
Te wa tuku: Tihema-07-2020