Moloko oa THz
Likristale tsa ZnTe
Sebakeng sa sejoale-joale sa THz time-domain spectroscopy (THz-TDS), mokhoa o tloaelehileng ke THz pulses generation by optical rectification (OR)of ultrashort laser pulses and then discover by free space electro-optic sampling (FEOS) in nonlinear crystals of specialientation. .
Ka tokiso ea optical, bandwidth ea ketsahalo e matla ea laser pulse e fetoleloa ho bandwidth ea THz emission, ha bobeli ba optical le THz signal co-propagate ka kristale e sa tloaelehang.
Ho FEOS, bobeli ba THz le li-laser pulses tse fokolang li hokahane ka har'a kristale e sa lekanyetsoang, e lebisang ho theTHz ts'ebetso ea karolo e susumetsoang ke tšimo ea pulse ea laser pulse e khethehileng esale pele.Ho lieha ha mohato ona ho lekana le matla a sebaka sa motlakase a lets'oao le lemohileng la THz.
Optical e hokahane le likristale tsa ZnTe
10x10x(1+0.01)mm
Likristale tse sa tloaelehang tse kang ZnTe, tse nang le <110> li-crystal orientation li khona ho sebelisoa ho OR le FEOS ka liketsahalo tse tloaelehileng.Leha ho le joalo, likristale tsa <100> orientation ha li na thepa e sa tloaelehang e hlokahalang bakeng sa OR le FEOS, le hoja li-linear tsa THz le thepa ea optical e tšoana le ea <110>-oriented crystals. Litlhoko tsa moloko o atlehileng oa THz kapa ho lemoha. ka sebonela-hōle se joalo sa crystal-based THz-TDS spectrometer ke mohato o ts'oanang pakeng tsa ho hlahisa (ho lemoha) pulse ea optical le e hlahisoang (e fumanoe) letšoao la THz.Leha ho le joalo, likristale tse se nang moeli tse loketseng lits'ebetso tsa THz spectroscopy li na le li-optical phonon resonances tse matla mofuteng oa THz, ho hasana ho matla ha THz refractive index ho fokotsa sekhahla sa maqhubu a bapisoang le mohato.
Likristale tse teteaneng tse se nang moeli li fana ka THz-optical phase e bapisang ho pota-pota sehlopha sa maqhubu a moqotetsane. Li tšehetsa karoloana feela ea bandwidth ea laser pulse e hlahisang (ho lemoha), kaha lipontšo tsa optical le THz li na le phihlelo e kholoanyane ea ho tsamaea ka maeto a malelele a ho phatlalatsa.Empa matla a lets'oao a phahameng a hlahisitsoeng (a fumanoeng) hangata a phahame bakeng sa sebaka se selelele sa phatlalatso.
Likristale tse tšesaane tse se nang moeli li fana ka mokhoa o motle oa ho tsamaisana le THz-optical phase ka har'a bandwidth e felletseng ea laser pulse e hlahisang (ho lemoha), empa matla a lets'oao a hlahisitsoeng (a lemohuoang) hangata a nyane, hobane matla a lets'oao a lekana le sebaka sa THz-optical co-propagation. .
E le ho fana ka mokhoa o pharaletseng oa ho bapisa karolo ea THz molokong le ho lemoha le ho boloka qeto ea maqhubu a le holimo ka ho lekaneng ka nako e le 'ngoe, DIEN TECH e atlehile ho hlahisa refractive e kopantseng ZnTe crystal- a 10µm thickness (110) ZnTe crystal on a (100)ZnTe fokotsa.Ka likristale tse joalo THz-optical co-propagation ke ea bohlokoa feela ka hare ho <110> karolo ea kristale, 'me lipontšo tse ngata li tlameha ho pharalla botenya bo feletseng bo kopantsoeng ba kristale.
