4Th International Conference on Applications of Optics and Photonics (Aop), Date: MAY 31-JUN 04, 2019, Location: Univ Lisbon, Lisbon, PORTUGAL, Sponsors: Int Commiss Opt, European Opt Soc, Red e Iberoamericana Optica, Soc Espanola Optica, Acad Mexicana Optica, Red Colombiana Optica, Opt & Photon Soc Singapore, Comite Venezolano Optica, Soc Tunisiene Optique, Soc Francaise Optique, Laser World Photon, Soc Portuguesa Fis, Uniao Profiss Opticos & Optometristas Portugueses, Associacao Hands Sci Network, Inst Astrofisica & Ciencias Espaco, AdLaser, M T Brandao, Portuguese Soc Opt & Photon, Host: Univ Lisbon