Terahertz qhov chaw yeej ib txwm yog ib qho tseem ceeb tshaj plaws hauv kev lag luam ntawm THz hluav taws xob. Ntau txoj hauv kev tau ua pov thawj ua haujlwm kom ua tiav THz hluav taws xob. Feem ntau, telectronics thiab photonics thev naus laus zis.Nyob rau hauv cov ntaub ntawv ntawm photonics, nonlinear optical sib txawv-ntau zaus tsim raws li loj nonlinear coefficient, siab kho qhov muag kev puas tsuaj pib nonlinear crystals yog ib txoj hauv kev kom tau txais lub zog siab, tunable, portable, thiab chav ua haujlwm kub THz yoj.GaSe thiab ZnGeP2 (ZGP) nonlinear crystals feem ntau yog siv.
GaSe crystals nrog tsawg nqus ntawm millimeter & THz nthwv dej, siab puas tsuaj pib thiab siab thib ob nonliear coefficient (d22 = 54 pm / V), feem ntau yog siv los ua Terahertz nthwv dej nyob rau hauv 40μm thiab kuj ntev waveband tunable Thz yoj (tshaj 40μm).Nws tau raug pov thawj tunable THz nthwv dej ntawm 2.60 -39.07μm thaum lub kaum sab xis ntawm 11.19 ° -23.86 ° [eoo (e - o = o)], thiab 2.60 -36.68μm tso zis thaum lub kaum sab xis ntawm 12.19 ° -27.01 ° [eoe (e. - o = e)].Tsis tas li ntawd, 42.39-5663.67μm tunable THz nthwv dej tau txais thaum lub kaum sib tw ntawm 1.13°-84.71° [oee (o - e = e)].
ZnGeP2 (ZGP) crystals nrog siab nonlinear coefficient, siab thermal conductivity, siab kho qhov muag puas qhov pib kuj tau tshawb fawb raws li qhov zoo tshaj THz.ZnGeP2 kuj muaj qhov thib ob nonlinear coefficient ntawm d36 = 75 pm / V), uas yog 160 npaug ntawm KDP muaju.Ob hom kev sib tw lub kaum sab xis ntawm ZGP muaju (1.03 ° - 10.34 ° [oee (oe = e)] & 1.04 ° - 10.39 ° [oeo (oe = e)]) ua cov zis zoo xws li THz (43.01 -5663.67μm), oeo hom tau ua pov thawj tias yog qhov kev xaiv zoo dua vim nws muaj txiaj ntsig zoo dua nonlinear coefficient.Nyob rau hauv ib lub sij hawm ntev heev, qhov tso zis proformance ntawm ZnGeP2 muaju raws li Terahertz qhov chaw raug txwv, vim hais tias lub ZnGeP2 siv lead ua los ntawm lwm tus neeg muag khoom muaj siab absorption nyob ze thaj tsam infrared (1-2μm): Absorption coefficient > 0.7cm-1 @ 1μm thiab > 0.06 cm 1 @2m.Txawm li cas los xij, DIEN TECH muab ZGP ( Qauv: YS-ZGP) crystals nrog super tsawg nqus: Absorption coefficient <0.35cm-1@1μm thiab <0.02cm-1@2μm.Lub siab tshaj plaws YS-ZGP crystals pab cov neeg siv kom ncav cuag cov zis ntau dua.
Siv:'基于 GaSe 和 Zn GeP2 晶体差频产生可调谐太赫兹辐射的理论研究'2008 Chin.Phys.Soc.
