TSH Generation
ZnTe crystals
Nyob rau hauv niaj hnub THz lub sij hawm-domain spectroscopy (THz-TDS), txoj hauv kev yog THz pulses tiam los ntawm kev kho qhov muag kho qhov muag (OR) ntawm ultrashort laser pulses thiab tom qab ntawd kev kuaj pom los ntawm qhov chaw dawb electro-optic sampling (FEOS) nyob rau hauv nonlinear crystals ntawm kev taw qhia tshwj xeeb. .
Hauv kev kho qhov muag kho qhov muag, qhov bandwidth ntawm qhov xwm txheej muaj zog laser mem tes hloov mus rau hauv bandwidth ntawm THz emission, thaum ob qho tib si optical thiab THz teeb liab co-propagate los ntawm nonlinear siv lead ua.
Hauv FEOS, ob qho tib si THz thiab tsis muaj zog sojntsuam laser pulses co-propagate los ntawm nonlinear siv lead ua, ua rau THz teb-induced theem retardation ntawm tshwj xeeb prepolarized sojntsuam laser mem tes.Qhov no theem retardation yog proportional rau lub zog teb hluav taws xob ntawm qhov kuaj pom THz teeb liab.
Optical hu rau ZnTe crystals
10 x 10 x (1 + 0.01) mm
Nonlinear crystals zoo li ZnTe, nrog <110> siv lead ua orientation tuaj yeem siv rau hauv LOSSIS thiab FEOS ntawm qhov xwm txheej ib txwm muaj.Txawm li cas los xij, cov crystals ntawm <100> kev taw qhia tsis muaj cov khoom tsis muaj kab uas xav tau rau LOSSIS thiab FEOS, txawm hais tias lawv cov kab THz thiab cov khoom kho qhov muag zoo ib yam rau cov khoom siv ntawm <110>-oriented crystals.Cov kev cai rau kev vam meej THz tiam los yog nrhiav kom tau. Nyob rau hauv xws li ib tug nonlinear siv lead ua-raws li THz-TDS spectrometer yog theem sib txuam ntawm lub generating (nrhiav) optical mem tes thiab generated (nrhiav) THz teeb liab.Txawm li cas los xij, cov crystals nonlinear haum rau THz spectroscopy daim ntaub ntawv muaj zog kho qhov muag phonon resonances nyob rau hauv THz ntau, qhov muaj zog dispersion ntawm THz refractive index txwv cov theem sib piv ntau zaus.
Thick nonlinear crystals muab THz-optical theem sib piv nyob ib ncig ntawm ib tug nqaim zaus band.Lawv txhawb tsuas yog ib feem ntawm lub bandwidth ntawm lub generating (nrhiav) laser pulse, txij li thaum kho qhov muag thiab THz teeb liab muaj kev loj taug kev-tawm ntev co-propagation nrug.Tab sis qhov generated (nrhiav) peak signal zog yog feem ntau siab rau ntev co-propagation nrug.
Nyias nonlinear crystals muab qhov zoo THz-optical theem sib piv nyob rau hauv tag nrho bandwidth ntawm lub generating (nrhiav) laser mem tes, tab sis lub generated (kub) teeb liab lub zog yog feem ntau me me, vim hais tias lub teeb liab lub zog yog proportional rau lub THz-optical co-propagation nrug deb. .
Txhawm rau muab cov theem dav dav sib piv hauv THz tiam thiab kev tshawb nrhiav thiab ua kom qhov kev daws teeb meem siab txaus nyob rau tib lub sijhawm, DIEN TECH tau ua tiav tsim kev sib xyaw ua ke ZnTe siv lead ua- 10µm thickness (110) ZnTe siv lead ua ntawm (100) ZnTe rho tawm.Nyob rau hauv xws li cov crystals THz-optical co-propagation tsuas yog ib qho tseem ceeb nyob rau hauv lub <110> ib feem ntawm cov siv lead ua, thiab ntau reflections yuav tsum ncua tag nrho cov ua ke siv lead ua thickness.
