Angularly Multiplexed Design And Study Of End-Pumped Zig-Zag Slab Gain Medium

The influence of thermal effect of the laser gain medium on the laser beam quality is serious. Slab laser gain medium eliminates thermal gradient induced lensing in the thickness direction and minimizes stress gradient induced birefringence when the ray propagates in a Zig-Zag manner. With End-Pumped and Conduction-Cooled technology,slab laser could produce high-average-power with good beam quality which makes it have developed rapidly and has a extensive application value in many fields.By summarizing the development of slab laser,especially the development of Conduction-Cooled End-Pumped Slab (CCEPS)laser, geometrical optics analysis of CCEPS laser/amplifer and angularly multiplexed amplifer are studied. First, using geometrical optics method,we analyse the factors which affect the fill factor and discuss the influence of each factor;found the model of CCEPS and simulate the sensitivity of angle to the slab;analyse the cause of stray light .And then,study the theory of angularly multiplexed amplifer,compute the fill factor's influence on output power when the input power is different,discuss and confirm a four pass angularly multiplexed amplifer optical path.Last,we did some experiments based on CCEPS. The max output power of power oscillator is 142W with an optical to optical effiency of 33%.Experiment one pass,two pass and four pass master oscillator-power amplifier,realizing angularly multiplexed amplifer based on CCEPS which produce a decuple output power in small signal;Advance some suggestions for next step experiments.