改善高功率激光二极管阵列光束质量的一种新方法

根据波导模理论,推导了高功率激光二极管阵列的远场分布,根据其分布特点,设计了一种离轴外腔.运用这种外腔,在工作电流为17A时,光束的束宽积从自由运转时的1100mm.mrad减小到128mm.mrad,二极管阵列的光束质量提高了8.5倍左右,输出功率约为自由运转时的75%.

According to optical waveguide theory, the far-field profile of laser diode arrays is derived. Basing on the distribution, an off-axis external cavity is designed. By employing the external cavity, at the operating current of 17A, the BPP of output laser is reduced from 1100 mm center dot mrad to 128 mm center dot mrad and the beam quality has about 8.5-fold improvement. The output power is 75% of the radiated power in free-running state without external cavity.