TY - JOUR
TI - Coherent synthesis of ultrashort pulse fiber laser based on balanced difference method
AU - Li Fangju
JN - Thermal Science
PY - 2021
VL - 25
IS - 6
SP - 4027
EP - 4034
PT - Article
AB - The output power of the fiber laser can be increased by synthesizing the  output beam, but the problem of low output power is caused by the poor  ability of controlling bandwidth in the current synthesis research.  Therefore, a coherent synthesis method of ultrashort pulse fiber laser  based on balanced difference method is proposed. The balance difference of  fiber combiner is divided into different modules, including data exchange  and acquisition, circuit balancing, phase compensation, etc. Select  appropriate ad conversion chip, use Ethernet chip W5300, design data  exchange, ensure the normal use of data acquisition function, in the signal  preprocessing module, use band-pass filter to filter out unnecessary  frequency components, use AD603 to design front-end balancing circuit,  design signal separation circuit, separate AC and DC signals, use active  phase lock. The phase compensation of each laser is realized by the fixed  technology, and the coherent synthesis of ultrashort pulse fiber laser is  realized by the fiber combiner. The experimental results show that, compared  with the traditional coherent synthesis method, the output power of the  coherent combination method based on balanced difference method is about 900  kW, which has higher output power and better control bandwidth. It provides  a theoretical basis for practical application.