Iikristale ezikumgangatho ophezulu we-BGSe (BaGa4Se7) yi-analogue ye-selenide ye-chalcogenide compound BaGa4S7, isakhiwo sayo se-orthorhombic se-acentric ichongiwe kwi-1983 kwaye umphumo we-IR NLO wabikwa kwi-2009, i-crystal ye-IR NLO esanda kuphuhliswa.Yafunyanwa ngobuchule beBridgman–Stockbarger.Le kristale ibonisa ukuhanjiswa okuphezulu kuluhlu olubanzi lwe-0.47-18 μm, ngaphandle kwencopho yokufunxa malunga ne-15 μm.
I-FWHM ye-(002) i-peak rocking curve imalunga ne-0.008 ° kwaye ukuhanjiswa ngepleyiti epolishiweyo ye-2 mm (001) ijikeleze i-65% kuluhlu olubanzi lwe-1-14 μm.Iipropati ezahlukeneyo ze-thermophysical zalinganiswa kwiikristale.
Indlela yokwandisa i-thermal kwi-BaGa4Se7 ayibonisi i-anisotropy eyomeleleyo ne-αa=9.24×10−6 K−1, αb=10.76×10−6 K−1, kunye ne-αc=11.70×10−6 K−1 ecaleni kweentsimbi ezintathu zekristale. .I-thermal diffusivity/i-thermal conductivity coefficients elinganiselwa ku-298 K yi-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, ecaleni kwe-a, b, c i-crystallographic axis ngokulandelelanayo.
Ukongeza, umda womonakalo we-laser womphezulu walinganiswa ukuba ube yi-557 MW / cm2 usebenzisa i-Nd: YAG (1.064 μm) laser phantsi kweemeko ze-5 ns ububanzi be-pulse, i-1 Hz frequency, kunye ne-D = 0.4 mm ubukhulu bebala.
Ikristale ye-BGSe (BaGa4Se7) ibonisa umgubo wesibini we-harmonic generation (SHG) impendulo emalunga ne-2-3 amaxesha e-AgGaS2.Umda womonakalo we-laser umphezulu umalunga ne-3.7 amaxesha ekristale ye-AgGaS2 phantsi kweemeko ezifanayo.
Ikristale ye-BGSe inomngcipheko omkhulu ongeyena umgca, kwaye inokuba nethemba elibanzi losetyenziso olusebenzayo kwingingqi ye-IR ye-spectral ephakathi.Ibonisa i-terahertz phonon-polaritons enomdla kunye ne-coefficients ephezulu engahambelani yokuvelisa i-terahertz.
Izinto eziluncedo kwimveliso ye-laser ye-IR:
Ifanelekile kwimithombo eyahlukeneyo yokumpompa (1-3μm)
Uluhlu olubanzi lwemveliso ye-IR enokuqhutywa (3-18μm)
OPA, OPO, DFG, intracavity/extravity, cw/pulse pumping
Isaziso esibalulekileyo: Ukusukela oku luhlobo olutsha lwekristale, ngaphakathi kwekristale inokuba nemigca embalwa, kodwa asikwamkeli ukubuyiswa ngenxa yesi siphene.
