Ultrafast speed, large angle, and high resolution optical beam steering using widely tunable lasers

Ultrafast speed, large angle, and high resolution optical beam steering using widely tunable lasers combined with properly cascaded transmission gratings has been demonstrated. An efficacy of 0.26 degrees/nm has been achieved in free space with three cascaded transmission gratings. Combined with angular magnification through a 4-f system, 28 degrees sweeping angle has been demonstrated with a 34 nm wavelength tuning. Through fast wavelength tuning, ultra-fast beam steering (>10(8)degrees/s) has been achieved with an angular resolution of about 0.15 degrees and a small beam divergence of below 0.06 degrees. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement