The density of states in amorphous hydrogenated silicon is obtained by deconvolution of the optical absorption coefficient a in the full subband-gap region. The spectral dependence of the optical absorption coefficient is measured by a constant photocurrent method (CPM) on forwardbiased Schottky diodes. The spectral dependence of reflection on the semitransparent Pt electrode is determined. All assumptions used in the deconvolution of a are discussed. The difference in measured value of a (by CPM) in the region below approximately 0.9 eV compared to the measurement of a by photothermal deflection spectroscopy (PDS) is explained by an absorption process seen in PDS and not seen in CPM. This absorption is supposed to be a transition from a deep localized state t o a deep localized gap state (two different charge states of the same defect). nonyrIeHa npu noMowH aeHoHBonmquH H O~( P ( P H~E I~H T~ nornorqeeuR a B 06JIaCTH m e p r~f i (POTOHOB Meribme IIIHPHH~I s a n p e q e~~o f i ~O H L J . CnempM HO~(P(PHLIH~HT~ nornoweHm nJlOTHOCTb COCTORHHfi B 3aIlpeIQeHHOfi 3OHe aMOp(PHOr0 rH~OreHH3HpOBaHHOl'O KPeMHHR IIOJlyYeHbI MeTOHOM nOCTORHHOr0 (POTOTOKB Ha AHOaaX m O T K H B OTKpbl TOM HaIlptUWleHHH. M3MepeHa CIIeKTpaJIbHaR 3aBHCHMOCTb OTpameHHR Ha IIOJl~lTpO3pa ¶HOfi IIJIaTHHOBOfi 3JleKTpOAe. 06cymnam~c~ BCB IIpeaIIOJlOWeHHR HCIIOJlb30BaHHbIe IIpH lXeKOHBOJlH)QHH a. Pa3HHUa Memay BeJlUYUHOfi K03(P(PHqHeHTa IIOrJlOIl(eHER a B 06JlaCTH 3HeprHfi MeHbIIIe 0,9 eV aJlR H3MepeHEIfi MeTOHOM IIOCTORHHOI'O (POTOTOKB H MeTOaOM (POTOOTKJIHKB 061112-HReTCII IIepeXOAOM MeXgy rJlY6OKHMH JIOKaJlH3WpOBaHHblMH COCTORHHRM~ (nBe COCTORHHR MeTOHOM IlOCTORHHOrO (POTOTOKa. omoro ne(PeKTa c p a a~b~~ a a p~a o~) . TOT nepexoa He ~a 6 n m~a e~c~ npa H~M~~~H H H a
We report comparative measurements of size dependent nonlinear transmission and optical power limiting in nanocrystalline magnesium ferrite (MgFe2O4) particles excited by short (nanosecond) and ultrashort (femtosecond) laser pulses.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.