All-optical guided-wave random laser in nematic liquid crystals

Abstract

Spatial solitons can affect and enhance random lasing in optically-pumped dyedoped nematic liquid crystals. Upon launching two collinear beams in the sample, the first to pump the fluorescent guest molecules and the second to induce a reorientational soliton, strikingly the second beam not only guides the emitted photons in the soliton waveguide, but also enhances the lasing efficiency and modulates its spectral width. By altering the scattering paths of the emitted photons, the soliton also contributes to the selection of the lasing modes, as further confirmed by the observed kinks in the input/output characteristics. These experimental results demonstrate that random lasing can be efficiently controlled by a light beam which does not interact with the gain molecules, opening a route towards light-controlled random lasers.

The Role of Progesterone Receptors in Breast Cancer

“… 51 RANKL pathway related with PR S191 phosphorylation. 52 , 53 Malbeteau et al indicated that the type I protein arginine methyltransferase 1 (PRMT1) can methylate PR at the arginine 637 and stables of the receptor, thereby accelerating its recycling and finally its transcriptional activity. 54 PRMT1 can also methylate ERα at Arg260, 55 it is involved in the ERα/PR cross talk.…”

Beaming random lasers with soliton control

“…The soliton was not only able to collect and guide fluorescence and stimulated emission due to pumping within the guest–host absorption spectrum, but also to affect the evolution of lasing modes in the longitudinally extended volume 5 , enhancing both RL directionality and profile. While some preliminary results on RL slope efficiency and spectral narrowing were reported earlier 28 , 29 , some salient basic features of soliton-aided RL are presented in Fig. 1 c-f with reference to samples investigated hereby.…”

“…1 e). This appears consistent with weak scattering close to the regime of under-coupling (i.e., a cavity much shorter than the nematicon) 5 , although it was not experimentally ascertained as higher pump energies (needed to lengthen the cavity) induced bleaching and saturation 29 , to be further investigated. The negligible change in frequency spacing versus soliton power pinpoints the role of absorption in limiting the extent of the effective resonator 5 , enabling stimulated emission only in the initial fraction of the pumped volume.…”

Tunable Plasmonic Random Laser Based on Emitters Coupled to Plasmonic Resonant Nanocavities of Silver Nanorod Arrays

“…[ 12 ] Nevertheless, controlling the emission wavelength of random lasers is still challenging due to the absence of optical cavity, which limits their applications in some fields such as medical detection, [ 13 ] photonic crystals, [ 14,15 ] and high‐precision sensors. [ 16,17 ] Therefore, emission characteristics of random lasers, especially the control strategies of the emission wavelengths, have attracted increasing attention, so far, various optical structures have been reported, including liquid crystals, [ 18 ] quantum dots, [ 19,20 ] graphene/semiconductor heterostructures, [ 21 ] polymer films, [ 22 ] disordered photonic crystal platform, [ 23 ] perovskite single crystals, [ 24 ] fibers, [ 5,25,26 ] and fiber gratings. [ 27 ] For example, Perumbiavil et al.…”