Laser emission in a hybrid biopolymer — Photochromic polymer structure

Abstract

We present studies on amplified spontaneous emission (ASE) and lasing phenomena obtained in two layers structure based on photochromic polymer and biopolymer system. A top layer was made of the deoxyribonucleic-acid with cetyltrimethyl-ammonium chloride cationic surfactant molecules (DNA-CTMA) doped with the Rhodamine 6G (Rh6G) laser dye and served as an “active” layer for laser emission. For a bottom layer we have chosen the L-21+TDI potochromic polymer in which the surface relief grating (SRG) was inscribed using holographic method to achieve effective refractive index modulation of the “active” layer. For the sample excitation doubled in frequency nanosecond pulse Nd∶YAG laser light (λ = 532 nm) was used. The threshold energy density of laser emission was ρ = 1.8 mJ/cm2 and for ASE ρ = 3.5 mJ/cm2.