Abstract: A new optical image rotating device, used in combination with laser diode bars or laser diode bar arrays, cylindrical lens elements or cylindrical lens element arrays, and an afocal image relay system, to achieve a highly collimated output laser beam suitable for use in many applications. Due to the simplicity of the optical image rotating device, fabrication of such a device is relatively easy and straightforward. The optical image rotation device is suitable for use with high-density laser diode bars, as well as continuous linear and 2D sources. Performance of the system is relatively insensitive to alignment of the optical image rotation device.