.A method of beam combination of high- power incoherent fiber laser[J].Optoelectronics Letters,2007,3(4):278-281 A method of beam combination of high- power incoherent fiber laser XUJie ZHAOShang·hong HOU Rui ZHANSheng-bao FANGShao-qiang SHl Lei TelecommunicationEngineeringInstitute,AirForceEngineeringUniversity,Xi’an710077,China Abstract:       Diffraction efficiency of grating plays an important role in output power of incoherent fiber laser beam combination.Through theoretic analysis and numerical simulations it has been proved that the diffraction efficiency would increase with the decrease of grating frequency and wavelength bandwidth. On the condition that the width of a fiber array is fixed at W=10 cm, an optimum grating frequency were numerically simulated as f=230 mm-1. Also an unequal interval method was proposed to improve the system efficiency of diffraction into 0.4293, which is higher than 0.3824 under the equal interval condition. Hits: 3584 Download times: 193 View Full Text    Download reader