Abstract: Optical devices for reforming optical beam and, hence, changing its size-divergence products along two directions perpendicular to beam propagating direction is disclosed. In one approach 90° roof reflector array is employed while in another approach 45° roof reflector array is employed. A simple reflection on the roof reflector array reforms optical beam and enables the adjustment of size-divergence product and, hence, provides the possibility of achieving symmetric beam. The other applications of the devices are beam switch beam equalizer. The devices are of great significance for diode laser and diode laser array.