Amakristalu ekhwalithi ephezulu e-BGSe (BaGa4Se7) iyi-analogue ye-selenide ye-chalcogenide compound BaGa4S7, isakhiwo sayo se-acentric orthorhombic sahlonzwa ngo-1983 futhi umphumela we-IR NLO wabikwa ngo-2009, iyikristalu esanda kwakhiwa ye-IR NLO.Itholwe ngendlela ye-Bridgman–Stockbarger.Le kristalu ikhombisa ukudluliselwa okuphezulu ebangeni elibanzi le-0.47-18 μm, ngaphandle kwenani eliphakeme lokumunca cishe elingama-15 μm.
I-FWHM ye-(002) yejika elinyakazayo eliphakeme icishe ibe ngu-0.008° futhi ukudlulisela ngepuleti elipholishiwe elingu-2 mm (001) licishe libe ngu-65% phezu kobubanzi obungu-1–14 μm.Izakhiwo ezihlukahlukene ze-thermophysical zikalwa kumakristalu.
Ukuziphatha kokunweba okushisayo ku-BaGa4Se7 akubonisi i-anisotropy eqinile ne-αa=9.24×10−6 K−1, αb=10.76×10−6 K−1, kanye ne-αc=11.70×10−6 K−1 eduze kwezembe lekristalu le-crystallographic .I-thermal diffusivity/i-thermal conductivity coefficients elinganiswa ku-298 K ingu-0.50(2) mm2 s−1/0.74(3) W m−1 K−1, 0.42(3) mm2 s−1/0.64(4) W m−1 K−1, 0.38(2) mm2 s−1/0.56(4) W m−1 K−1, eduze ne-a, b, c ye-crystallographic eksisi ngokulandelanayo.
Ngaphezu kwalokho, umkhawulo wokulimala kwe-laser ongaphezulu ukalwe waba ngu-557 MW/cm2 kusetshenziswa i-Nd:YAG (1.064 μm) laser ngaphansi kwezimo zobubanzi obungu-5 ns pulse, 1 Hz frequency, kanye no-D=0.4 mm usayizi wendawo.
Ikristalu ye-BGSe (BaGa4Se7) ibonisa impendulo eyimpuphu yesibili yesizukulwane se-harmonic (SHG) ecishe ibe izikhathi ezingu-2-3 kune-AgGaS2.Umkhawulo womonakalo we-laser ongaphezulu ucishe uphindwe izikhathi ezingu-3.7 kunekristalu ye-AgGaS2 ngaphansi kwezimo ezifanayo.
Ikristalu ye-BGSe inokuthambekela okukhulu okungeyona imigqa, futhi ingase ibe nethemba elibanzi lezinhlelo zokusebenza ezingokoqobo endaweni emaphakathi ye-IR. Ibonisa amaphonon-polariton e-terahertz athakazelisayo kanye nama-coefficient aphezulu angaqondile okukhiqiza i-terahertz.
Izinzuzo zokukhishwa kwe-laser ye-IR:
Ifanele imithombo yokumpompa ehlukahlukene (1-3μm)
Ibanga lokuphumayo le-IR elisebenzisekayo elibanzi (3-18μm)
OPA, OPO, DFG, intracavity/extravity, cw/pulse pumping
Isaziso esibalulekile: Njengoba lokhu kuwuhlobo olusha lwekristalu, ngaphakathi kwekristalu kungase kube nama-streak ambalwa, kodwa asikwamukeli ukubuyiselwa ngenxa yaleli phutha.
