H01S 5/24

Structure or shape of the semiconductor body to guide the optical wave {; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers} having a grooved structure, e.g. V-grooved {, crescent active layer in groove, VSIS laser}