A Microstructured Laser With Modulated Period for Beam Control

In this paper, a microstructured laser with modulated periodic microstructures for beam control is proposed for the first time. Lasers using modulated periodic microstructures can emit beam with lower vertical divergence angle for the same number of microstructures. And lasers with specific period length can transmit beam in specific direction. These lasers emitting beams with different emission directions can be integrated into an array. And this array can be used directly as a transmitter chip of LiDAR. Both simulation and experimental results show that the modulated periodic microstructures can effectively reduce the vertical divergence angle. In the experiment, the lowest vertical divergence angle of 0.88° and a large angle sweep range of 41.5° have been obtained. A horizontal divergence angle of 4.3° is achieved with the taper structure. Typical optical power is 29 mW.