A solid state laser comprising: (a) at least a laser generating means (40, 41, 42, 43, 44, 45) for generating a pumping laser light (L2); (b) a plurality of laser medium means (21, 105, 106) arranged relative to the laser generating means (40, 41, 42, 43, 44, 45); (c) the laser medium means (21, 105, 106) arranged for defining a zigzag reflected optical path (LD) when imparting the laser light (L2) or the laser lights (L2) to the laser medium means (21, 105, 106) along the zigzag reflected optical path (LP); and (d) an optical means (60, 61) for performing oscillating and exciting operations of a laser light (L1) produced along the zigzag reflected optical path (LP) when imparting the laser light (L2) or the laser lights (L2) to the laser medium means (21, 105, 10) along the zigzag reflected optical path (LP), thereby producing a high power output light (L3).