Isizukulwana seTHz
Iikristale zeZnTe
Kwinkqubo yangoku ye-THz yexesha-domain spectroscopy (THz-TDS), indlela eqhelekileyo yi-THz pulses generation by optical rectification (OR) ye-ultrashort laser pulses kwaye emva koko ukubhaqwa ngendawo yasimahla yesampulu ye-electro-optic (FEOS) kwiikristale ezingezizo ezikhethekileyo. .
Kwi-optical rectification, i-bandwidth yesiganeko esinamandla se-laser pulse iguqulwa ibe yi-bandwidth ye-THz emission, ngelixa zombini i-optical kunye ne-THz signal co-propagate nge-crystal nonlinear.
Kwi-FEOS, zombini i-THz kunye ne-laser probe pulses ebuthathaka isasazeke ngekristale engahambelaniyo, ekhokelela ekubuyiselweni kwesigaba se-theTHz senqanaba le-prepolarized prepolarized laser pulse.Esi sigaba sokubuyiswa kwesigaba silingana namandla ombane we-THz efunyenweyo.
I-Optical iqhagamshelwe iikristale ze-ZnTe
10x10x(1+0.01)mm
I-crystals engabonakaliyo njenge-ZnTe, ene-<110> i-crystal orientation iyakwazi ukusetyenziswa kwi-OR kunye ne-FEOS kwiimeko eziqhelekileyo.Nangona kunjalo, i-crystals ye-<100> i-orientation ayinazo iipropati ezingabonakaliyo ezifunekayo kwi-OR kunye ne-FEOS, nangona i-THz yabo yomgca kunye neempawu ezibonakalayo zifana ne-<110>-oriented crystals.Iimfuno zesizukulwana esiphumeleleyo se-THz okanye ukufumanisa kwi-crystal-based THz-TDS spectrometer enjalo i-crystal-based spectrometer ihambelana nesigaba phakathi kokuvelisa (ukufumanisa) i-pulse optical kunye neveliswa (ifunyenwe) isignali ye-THz.Nangona kunjalo, iikristale ezingezizo ezilungele ukusetyenziswa kwe-spectroscopy ye-THz zinee-optical phonon resonances eziqinileyo kuluhlu lwe-THz, ukusasazwa okunamandla kwe-THz refractive index kunciphisa uluhlu lwamafrikhwensi ahambelana nesigaba.
Iikristale ezityebileyo ezingabonakaliyo zibonelela nge-THz-optical phase ehambelanayo malunga ne-band frequency band.Baxhasa kuphela iqhezu le-bandwidth ye-laser pulse evelisayo (ukufumanisa), ekubeni izibonakaliso ze-optical kunye ne-THz zifumana ukuhamba okukhulu kwimigama emide yokusabalalisa.Kodwa amandla ophawu oluvelisiweyo (ochongiwe) luphezulu ngokubanzi kumgama omde wokusasaza.
Iikristale ezinqabileyo ezingabonakaliyo zibonelela kakuhle kwisigaba se-THz-optical ehambelanayo ngaphakathi kwe-bandwidth epheleleyo yokuvelisa (ukubona) i-laser pulse, kodwa amandla omqondiso owenziweyo (ochongiwe) udla ngokuba mncinci, kuba amandla omqondiso alingana ne-THz-optical co-propagation imigama. .
Ukwenzela ukubonelela ngesigaba esibanzi sebhendi ehambelanayo kwisizukulwana se-THz kunye nobhaqo kunye nokugcina isisombululo sokuphindaphinda siphezulu ngokwaneleyo ngexesha elinye, i-DIEN TECH iphuhlise ngempumelelo i-refractive edityanisiweyo ye-ZnTe crystal- a 10µm ubukhulu (110) ZnTe crystal kwi (100)ZnTe thabatha.Kwiikristali ezinjalo i-THz-optical co-propagation ibaluleke kuphela ngaphakathi <110> inxalenye yekristale, kwaye izibonakaliso ezininzi kufuneka zidibanise ubuninzi be-crystal obudibeneyo.
