Todor Kirilov Kalkandjiev graduated in Nuclear Physics from Sofia University and defended PhD in Physics and Mathematics in 1983 (Quantum Electronics Department of Sofia University). Up to 1993 he worked in Sofia University (as Senior Researcher in the Institute of Laser Technique) and in Bulgarian Academy of Sciences (as scientific director of Institute of Crystallography and Mineralogy). He participated and managed various projects, mainly related to the defense industry. Since 1993 up to 1997 was a head of R&D Department of Optron Technology Ltd (Bulgaria), a company developing and manufacturing compact laser heads for rangefinders. Since 1998 up to 2001 he worked in Monocrom SL (Spain) and has been engaged in the development of technology for diode bar mounts. Since 2001 up to 2005 he is consultant in the field of the laser crystals and solid state lasers. In 2006 he co-founded Conerefringent Optics SL. Currently he is part time professor at Universidad Autónoma de Barcelona and CTO of Conerefringent Optics. His research activity is reflected in more than 30 articles and 4 international patents.