Experimental Study of Large-Mode-Area Fiber Amplifier for Coherent Combination
用于相干合成大模面积光纤放大器的实验研究

Experimental research of a backward-pumped large-mode-area ytterbium-doped double-cladding fiber amplifier was reported for the use of the laser beam coherent combination.The amplifier obtained the highest output power of 1.61 W,with the amplified signal having the 3 dB linewidth of 0.027 nm at the peak wavelength of 1 058.37 nm,preserving the exceptional spectrum characteristics of the original signal.For the first time,was experimentally investigated the power evolvement of the residual pump beam,the forward beam,the backward beam and et al.in this type of amplifier.The aim of this research was to explore the feasible project of the laser beam coherent combination.The designed linewidth of the laser beam both alleviated the coherent combination and suppressed Stimulated Brillouin Scattering(SBS) effectively.