DIFF Subgroup
H01S 3/0619 Full Title
Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range (semiconductors lasers H01S5/00) > Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium > Construction or shape of active medium
Of 2 combined children, 0 exist in both systems.
2 codes are CPC-only extensions.