CAOL conference has long history. Previous conferences were successfully held in 2003, 2005, 2008, 2010 and 2013 in Crimea, Ukraine, in 2006 in Guanajuato, México, in 2016 in Odessa, Ukraine and in 2019 in Sozopol, Bulgaria.
Information on the previous international meetings on optoelectronics and lasers can be found in IEEE Photonics Society Newsletter (formerly IEEE/LEOS Newsletters): 4-1999, 4-2000, 4-2001, 3-2004 2-2006, 2-2009, 4-2010, 4-2011 etc.