Analysis On Principles And Realization Of High-power Coherent Semiconductor Laser Arrays

High-power coherent semiconductor laser arrays (HCSLAs) have potential applications in areas like coherent laser radars. This thesis systematically analyzes the principles and realization methods of HCSLAs, and suggests that embedding Surface-emitting Distributed-Feedback-Bragg (SE-DFB) laser elements into photonic lattices could be an effect method to realize HCSLAs. The article designs and optimizes the structures of SE-DFB and its coherent arrays (CAs), and proposes a future research framework.Basing on the principles of beam coherence and laser diode arrays, the thesis shows the key to realize coherent semiconductor laser arrays (CSLAs) is phase locking. According to the analysis on the dramatic contrast between required parameters and the limitation of CSLAs, this thesis proves the difficulties of researches on HCSLAs come from the nature of semiconductor materials and semiconductor processing technology. To realize practical HCSLAs, we should select proper type of laser diodes--whose single mode property determines the best performance of their CAs--and couple them into proper array structure, and lastly narrow the frequency linewidth by using additional mechanism. By reviewing the existent approaches to HCSLAs, it reaches at the point that SE-DFB laser elements plus photonic lattice structure, derived from resonant wave guide, can be a promising way to HCSLAs.The thesis builds up and optimizes its own structures of SE-DFB and the correlated array, and witnesses their outstanding high-power single mode performance, and points out the shortages and future research directions of SE-DFB. To over come the shortages and finally realize the HCSLAs using SE-DFB, the thesis suggests to replace the designed grating structure with non-rectangle shape, to simulate it basing on a close-loop design platform and to grow the materials using an on-site automatic control system. The thesis sketches the content of the lab's future research.