title: Lasing in imperfectly aligned cholesterics.
abstract: Optically pumped light emissions in imperfectly aligned dye-doped cholesteric cells with glance and frosted glass substrates of three different cell gap thicknesses are experimentally studied. Alignment imperfections show up in emission spectra by a broadening of the photonic bandgap (PhBG) lasing (allowed) lines at short- and long-wavelength PhBG edges and by an additional (forbidden) emission line inside the PhBG. Forbidden and allowed lines differ distinctively by their stability in the course of pumping. The origin of the forbidden line is discussed.
authors.forename: T H
authors.initials: TH
authors.lastname: Dudok
authors.forename: V I
authors.initials: VI
authors.lastname: Savaryn
authors.forename: O M
authors.initials: OM
authors.lastname: Krupych
authors.forename: A V
authors.initials: AV
authors.lastname: Fechan
authors.forename: E
authors.initials: E
authors.lastname: Lychkovskyy
authors.forename: V V
authors.initials: VV
authors.lastname: Cherpak
authors.forename: B
authors.initials: B
authors.lastname: Pansu
authors.forename: Yu A
authors.initials: YA
authors.lastname: Nastishin
mesh_terms: D002784:Cholesterol / Q000737:chemistry* / Q000528:radiation effects; D005898:Glass; D054025:Lasers, Dye; D050866:Liquid Crystals; D055620:Optical Phenomena; D013050:Spectrometry, Fluorescence; D013053:Spectrophotometry
chemical_list: D002784:Cholesterol