Laser-based optical techniques for the detection of chemical agents⋆ Milan S. Trtica, Bojan Radak, Dubravka Milovanovic, Miroslav Kuzmanovic and Jelena Savovic Eur. Phys. J. Plus, 133 7 (2018) 268 Published online: 20 July 2018 DOI: 10.1140/epjp/i2018-12145-4