Fused side-coupler for double-clad fiber lasers with CO2 laser

The purpose of coupling technology is to couple high-power laser from laser diode to double-clad fiber cladding to get the high pumped power.In order to simplify the fiber angle-polished side-coupling technology,a novel method using CO2 laser to make fused side-coupler for double-clad fiber was introduced.The experimental equipment and making process for such fused side-couplers were introduced.The side coupler,from 105μm/125μm muhimode fiber to 125μm double-clad fiber,was made with a coupling efficiency of 82% by means of this method.These results show that this kind of fused side-coupler can be used in high-power side-pumped double-clad fiber lasers practically.