Tsarin THz
ZnTe lu'ulu'u
A cikin THz lokaci-yankin spectroscopy na zamani (THz-TDS), tsarin gama gari shine tsararrun bugun jini na THz ta hanyar gyaran gani (OR) na ƙwanƙwasa laser ultrashort sannan kuma ganowa ta hanyar samfuran sararin samaniya ta kyauta (FEOS) a cikin lu'ulu'u marasa kan layi na fuskantarwa ta musamman. .
A cikin gyare-gyaren gani, bandwidth na abin da ya faru mai ƙarfi Laser bugun jini yana canzawa zuwa bandwidth na watsawar THz, yayin da duka siginar na gani da THz suna haɓaka ta hanyar kristal mara tushe.
A cikin FEOS, duka THz da raunin bugun laser mai rauni suna haɓaka ta hanyar lu'u-lu'u mara nauyi, wanda ke haifar da jinkirin lokaci na filin THz na bugun bugun laser prepolarized na musamman.Wannan jinkirta lokaci yayi daidai da ƙarfin filin lantarki na siginar THz da aka gano.
Lu'ulu'u ZnTe da aka tuntube na gani
10x10x(1+0.01)mm
Lu'ulu'u marasa kan layi kamar ZnTe, tare da <110> lu'ulu'u suna iya amfani da su a cikin OR da FEOS a al'ada ta al'ada.Duk da haka, lu'ulu'u na <100> daidaitawa ba su mallaki kaddarorin da ba su dace ba waɗanda ake buƙata don OR da FEOS, kodayake THz na layin su da kaddarorin gani sun yi kama da na <110> - lu'ulu'u masu daidaitawa. Abubuwan buƙatun don haɓakar THz mai nasara ko ganowa. A cikin irin wannan siginar siginar THz-TDS mai tushen lu'ulu'u wanda ba ya kan layi yana daidaita lokaci tsakanin ƙwanƙwasa (gano) bugun gani da ƙirƙira (gano) siginar THz.Duk da haka, lu'ulu'u marasa kan layi da suka dace da aikace-aikacen sifofi na THz suna da ƙarfin sautin phonon mai ƙarfi a cikin kewayon THz, ƙaƙƙarfan tarwatsawa na THz refractive index yana iyakance kewayon madaidaicin lokaci.
Ƙaƙƙarfan lu'ulu'u masu kauri suna ba da lokaci na THZ-optical matching a kusa da kunkuntar mitar band. Suna goyan bayan wani yanki ne kawai na bandwidth na bugun jini na laser (ganowa), tun da siginar gani da THz suna fuskantar babban tafiya a kan nesa mai nisa na haɗin gwiwa.Amma haɓakar (gano) ƙarfin siginar kololuwa gabaɗaya yana da tsayi don tsayin nisan haɗin gwiwa.
Ƙaƙƙarfan lu'ulu'u marasa layi suna ba da kyakkyawan lokaci na THz-optical matching a cikin cikakken bandwidth na samar da (gano) Laser bugun jini, amma samar (gano) ƙarfin siginar yawanci karami ne, saboda ƙarfin siginar ya yi daidai da nisan haɗin haɗin gwiwa na THz-optical. .
Don samar da madaidaicin lokaci mai faɗi a cikin ƙarni na THz da ganowa da kiyaye ƙudurin mitar daidai lokaci guda, DIEN TECH ya sami nasarar haɓaka haɓakar haɗin ZnTe crystal- kauri 10µm (110) ZnTe crystal akan (100) ZnTe ragi.A cikin irin waɗannan lu'ulu'u, haɓakawar haɗin gwiwa na THz-optical yana da mahimmanci kawai a cikin <110> ɓangaren kristal, kuma ɗimbin tunani dole ne ya faɗi cikakkiyar kauri mai hade.
