Isizukulwane se-THz
Amakristalu e-ZnTe
Ku-spectroscopy yesimanje yesizinda sesikhathi se-THz (THz-TDS), indlela evamile i-THz pulses generation by optical rectification (OR)of ultrashort laser pulses kanye nokutholwa ngesikhala samahhala sesampula ye-electro-optic (FEOS) kumakristalu angaqondile wokuma okukhethekile. .
Ekulungiseni okubonakalayo, umkhawulokudonsa wesigameko sokushaywa kwe-laser enamandla uguqulelwa kumkhawulokudonsa we-THz emission, kuyilapho kokubili isignali yokubona ne-THz isakaza ngokubambisana ngekristalu engaqondile.
Ku-FEOS, kokubili i-THz kanye ne-laser probe pulses ebuthakathaka isakazeka ngokuhlanganyela ngekristalu engaqondile, okuholela ekubambezelekeni kwesigaba se-theTHz esidalwe yinkambu ye-laser probe probe pulse ngokukhethekileyo.Lesi sigaba sokubambezeleka silingana namandla enkambu kagesi yesiginali ye-THz etholiwe.
Amakristalu e-Optical axhumene ne-ZnTe
10x10x(1+0.01)mm
Amakristalu angaqondile afana ne-ZnTe, anomumo wekristalu <110> ayakwazi ukusetshenziswa kokuthi OR kanye ne-FEOS ngesigameko esivamile.Kodwa-ke, amakristalu e- <100> orientation awanazo izakhiwo ezingaqondile ezidingekayo ku-OR kanye ne-FEOS, nakuba i-THz yawo ewumugqa kanye nezici zokubona zifana nalezo zamakristalu aqondiswe ku-<110>.Izidingo zesizukulwane esiyimpumelelo noma ukutholwa kwe-THz ku-spectrometer enjalo ye-crystal-based THz-TDS engaqondile ifana nesigaba phakathi kwe-pulse optical ekhiqizayo (ebonayo) kanye nesignali ye-THz ekhiqiziwe (itholiwe).Noma kunjalo, amakristalu angaqondile afanele izinhlelo zokusebenza ze-spectroscopy ye-THz anama-optical phonon resonances aqinile ebangeni le-THz, ukuhlakazwa okuqinile kwe-THz refractive index kunciphisa umkhawulo we-frequency yesigaba.
Amakristalu aqinile angenawo umugqa ahlinzeka ngokufaniswa kwesigaba se-THz-optical eduze kwebhendi yefrikhwensi encane. Asekela kuphela ingxenyana yomkhawulokudonsa womshini we-laser okhiqizayo (owutholayo), njengoba amasiginali we-optical kanye ne-THz ehlangabezana nokuhamba okukhudlwana kumabanga amade okusabalalisa ngokubambisana.Kodwa amandla esignali aphezulu akhiqiziwe (atholiwe) ngokuvamile aphezulu ngebanga elide lokusabalalisa ngokubambisana.
Amakristalu azacile angenawo umugqa ahlinzeka ngokufaniswa okuhle kwesigaba se-THz-optical ngaphakathi komkhawulokudonsa ogcwele we-laser pulse ekhiqizayo (ebonayo), kodwa amandla esignali akhiqiziwe (atholiwe) ngokuvamile aba mancane, ngoba amandla esignali alingana namabanga okusabalalisa ngokubambisana kwe-THz-optical. .
Ukuze kuhlinzekwe isigaba esibanzi esihambisanayo esizukulwaneni se-THz nokutholwa nokugcina ukulungiswa kwefrikhwensi kuphezulu ngokwanele ngesikhathi esifanayo, i-DIEN TECH ithuthukise ngempumelelo i-refractive ehlangene ye-ZnTe crystal- a 10µm thickness (110) ZnTe crystal on a (100)ZnTe khipha.Kumakristalu anjalo i-THz-optical co-propagation ibalulekile kuphela ngaphakathi<110> ingxenye yekristalu, futhi ukuboniswa okuningi kufanele kudlule ugqinsi olugcwele lwekristalu oluhlanganisiwe.
