Makristasi apamwamba kwambiri a BGSe (BaGa4Se7) ndi selenide analogue ya chalcogenide compound BaGa4S7, yomwe acentric orthorhombic structure inadziwika mu 1983 ndipo zotsatira za IR NLO zinanenedwa mu 2009, ndi crystal yatsopano ya IR NLO.Idapezedwa kudzera munjira ya Bridgman-Stockbarger.Klastalo iyi imawonetsa kufalikira kwakukulu pamitundu yambiri ya 0.47-18 μm, kupatula pachimake choyamwa pafupifupi 15 μm.
FWHM ya (002) yopindika pachimake ndi pafupifupi 0.008 ° ndipo ma transmittance kudzera mu mbale yopukutidwa ya 2 mm (001) ndi mozungulira 65% pamtunda wa 1-14 μm.Makhalidwe osiyanasiyana a thermophysical adayesedwa pa makhiristo.
Kukula kwamafuta mu BaGa4Se7 sikuwonetsa anisotropy yamphamvu yokhala ndi αa=9.24×10−6 K−1, αb=10.76×10−6 K−1, ndi αc=11.70×10−6 K−1 motsatira nkhwangwa zitatu za crystallographic. .Thermal diffusivity/thermal conductivity coefficients yoyezedwa pa 298 K ndi 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, motsatira a, b, c crystallographic axis motsatana.
Kuphatikiza apo, kuwonongeka kwa laser pachimake kunayesedwa kukhala 557 MW/cm2 pogwiritsa ntchito laser ya Nd:YAG (1.064 μm) pansi pamikhalidwe ya 5 ns pulse wide, 1 Hz frequency, ndi D=0.4 mm kukula kwake.
BGSe (BaGa4Se7) crystal imasonyeza kuyankha kwa ufa wachiwiri wa harmonic (SHG) womwe uli pafupifupi 2-3 nthawi ya AgGaS2.Kuwonongeka kwa laser pamwamba kumakhala pafupifupi nthawi 3.7 kuposa kristalo ya AgGaS2 pansi pamikhalidwe yofanana.
BGSe crystal ili ndi chiwopsezo chachikulu chosagwirizana ndi mzere, ndipo ikhoza kukhala ndi chiyembekezo chochuluka chogwiritsa ntchito pakatikati pa IR spectral region. Imawonetsa chidwi cha terahertz phonon-polaritons ndi ma coefficients apamwamba osagwirizana ndi m'badwo wa terahertz.
Ubwino wa IR laser linanena bungwe:
Oyenera gwero zosiyanasiyana kupopera (1-3μm)
Kutulutsa kosiyanasiyana kwa IR (3-18μm)
OPA, OPO, DFG, intracavity/extravity, cw/pulse pumping
Chidziwitso chofunikira: Popeza iyi ndi mtundu watsopano wa kristalo, mkati mwa kristalo ukhoza kukhala ndi mizere yochepa, koma sitikuvomereza kubweza chifukwa cha cholakwikachi.
