Coherent beam combination (CBC) of laser arrays is an efficient way to scale brightness. We demonstrate CBC of two slab laser amplifiers based on active phase locking. Instead of the complex phase detection system, intensity detection is used and the feedback control signal is calculated based on the stochastic parallel gradient descent (SPGD) algorithm. The experimental investigation on a 101.5-W CBC of two slab amplifiers shows that the entire system in a closed loop performs well for long-time observation. A combination efficiency of nearly 81% is realized. The slab amplifier laser arrays are the coherent beams efficiently combined by active phase locking based on the SPGD.

It is very necessary to establish a kind of rapid and accurate method about detecting crystal violet for food security. In this paper, we summary the present progress in analyzing the crystal violet from three respects: sample pretreatment, detection tool, and quantitative calculation method, puts forward the direction of future development on the detection and analysis of crystal violet in aquatic products ,and gives some suggestions on it. It has certain reference value on the detection and analysis of relevant research.

No abstract