Random lasers tuning by combining a dye-doped liquid crystal and CdS nanoparticles

We report the development of LC (negative liquid crystal and mixing liquid crystals) random lasers doped with a gain medium and CdS nanoparticles. By performing frequency doubled 532 nm Nd:YAG (yttrium aluminum garnet) laser as a function of excitation wavelength, we demonstrate laser action in a new category of materials, namely dye doped liquid crystal with semiconductor nanoparticles. The CdS nanoparticles prove to be perfect candidates for building, as shown, a series of laser systems. Lasing is presented in cells, freely suspended liquid crystal films. The optical emission properties are investigated in terms of spectral analysis, below and above lasing energy threshold behavior, emission efficiency, far field spatial laser modes intensity profiling, etc. As demonstrated, these DDLC random lasers with the CdS nanoparticles are very promising platforms for investigating the optical mechanism of cadmium sulfide.