Te hoahoa ara whatu o te 66-femtosecondtaiaho raka-aratau
Ko tēnei taiaho raka-aratau 66-femtosecond he taiaho muka ytterbium-whakapiripiri-katoa e pupuri ana i te pōraritanga-katoa me te nekehanga ā-wāhanga kore-tauutuutu. Ka tutuki i a ia te raka-aratau auau taketake 147 MHz. Mā te whakarerekē i te tawhiti i waenga i ngā whatanga, ka whiwhihia he whānui āwhata o te 39.8 nm me te whānui pāoro o te 66 fs i muri i te pēhitanga o waho. I te kaha papu teitei, ka tutuki te raka-aratau harmony tuarua me te tuatoru me ngā auau tāruarua o te 294.1 MHz me te 442.3 MHz.
Whakaahuatanga ara whatu:
Kei roto i te resonator ngā wāhanga whatu ā-wāhi i ngā taha e rua, me te wāhanga muka pupuri-polarization i waenganui. Kei roto i te wāhanga ā-wāhi maui he whakaata whakaata katoa (M1), he pereti ngaru λ/8 (EWP), me te hurihanga Faraday (FR). Ka taea te whakamahi i te huinga o EWP me te FR hei nekehanga ā-wāhanga kore-tauutuutu, e whakarato ana i te piro ā-wāhanga kore-tauutuutu, ā, ka whakarei ake i te kaha tīmatanga-ake. Kei roto i te wāhanga muka he taputapu whakauru-whakanui wehenga roangaru ritenga (WDM-Collimator), he muka pupuri-polarization 62 cm kua tāpirihia ki te ytterbium (Yb401-PM, CORACTIVE), me te whakakotahi muka whatu (Col). Ka pupuhihia te muka whakanui e te diode taiaho 976 nm aratau-kotahi (LD) me te mana papu mōrahi o te 1.4 W. Ko te wāhanga ātea matau he pereti haurua-ngaru (HWP), he wehewehe hihi polarization (PBS), he takirua kutikuti (LightSmyth T-1000-1040-3212-94), me te whakaata whakaata katoa (M2). Ko te takirua kutikuti tuku me te kiato raina o te 1000 raina/mm e whakarato ana i te utu marara i roto i te kōhao. Ka taea te whakarite i te tawhiti i waenga i ngā kutikuti e rua mā te atamira. Ko te roa o te wāhi kore utu mai i te collimator ki ngā whakaata whakaata e rua i ngā taha e rua he 5.5 cm me te 6.5 cm ia. Ko terēserika whakaputa i ngā pātere i roto i te āhua porotaka rārangi mai i te PBS.
Te kaupapa mahi:
Ko te pūoro kua whakaritea tuatahi e tukuna ana mā te koropiko ā-roto ka tīmata mai i te PBS ka tukuna ki te M1. I te tīmatanga, ka wehewehea e te HWP te pūoro kia rua ngā wāhanga orthogonal, kātahi ka uru ki te muka whatu tiaki-polarization ka horapa i runga i ngā toki tere me ngā toki puhoi. Ko te ōwehenga kaha o ngā pūoro i runga i ngā toki orthogonal e rua ka whakatauhia e te koki hurihuri (θh) o te HWP. I te wā e horapa ana i roto i te muka whatu, nā ngā pānga kore-raina, ka puta he nekehanga āhua kore-raina e pā ana ki te kaha nā te kaha kore-taurite o ngā pūoro kua polarized orthogonal. Mā te whakaata mutunga M1 ka taea e ngā pūoro orthogonal te haere i roto i te nekehanga āhua kia rua ngā wā ka hoki ki te muka whatu tiaki-polarization. Ka whiwhi ngā pūoro orthogonal i te nekehanga āhua kore-tauutuutu π/2 ka whakawhiti i te tuaka whatu horapa. Ko te kore taurite o te tere rōpū i waenga i ngā pūoro kua polarized orthogonal ka arahi ki te utu o te pānga peka. Hei whakamutunga, ka kohikohi te pūoro i ngā nekehanga āhua kore-raina rerekē ka pāngia e te pokanoa i te PBS. Hei pūwhakapūngao, ka taea e te PBS te tuku i ngā pāorooro āhua pūwhakapūngao tika kia puta, ko te toenga ka whakaatahia ki waho o te kōhao. Ka mahi tēnei tukanga hei ngongo whakakī horihori i roto i tēnei kōhao rārangi.rēseri whatu. Ina whakaitihia te tawhiti o te takirua whatu ki te 3.2 mm, ka tino pari ake te taha maui o te whānuitanga. I tēnei wā, he pai te horapa kupenga o te kōhao, ā, ka whiwhihia te kaha pāoro kotahi mōrahi o te 3.57 nJ. Ko te tohu hononga-whaiaro pāoro i whiwhihia mā te pēhitanga o waho o te pāoro me te whānui whānuitanga 39.8 nm ka whakauruhia e te mahi Gaussian, arā, 66 fs.
Te wā tuku: 25-Pepuere-2026