dela Rosa, M.A., Olaya, C.M., De Vero, J. and Garcia, W. 2011. Spectroscopic characterization of Er:YAG, Nd:YAG, Ruby and Ti:Sapphire laser crystals using simple spectroscopic set-up. Proceedings of the Samahang Pisika ng Pilipinas, 29(1), SPP2011-PB-3. URL: https://proceedings.spp-online.org/article/view/SPP2011-PB-3.