1. A detector array for an imaging system, including: an array of scintillator crystals, wherein each scintillator crystal includes a plurality of side surfaces, wherein at least a portion of at least one scintillator crystal side surface is configured by laser etching of the at least one scintillator crystal side surface with microfracture regions of different sizes to diffusely reflect light back into the at least one crystal, wherein each microfracture region is adjacent to at least one microfracture-free region of the at least one scintillator crystal side surface; and an array of photodetectors optically coupled to the array of scintillator crystals.