The spatial combination of four near-infrared laser beams was demonstrated by combining polarized beam and spectral beam,which included solid nanosecond pulse laser,high-power continuous wave(CW)fiber laser,high repetition rate nanosecond pulse fiber laser and sub-millisecond(long pulse)fiber laser.The simulation software was developed to design and optimize the main relevant parameters such as spectral characteristics and polarization characteristics of polarization beam combiner,spectral beam combiner and each laser.Based on the simulation results,a compound laser system composed of the above four laser systems and a set of polarization/spectral beam combination links was developed.The beam combination efficiency of the system is up to 93.9%,which realized the coaxial emission of multiple pulses and CW laser beams in the near-infrared band.The system can be used to study the cooperative effect of the laser-material interaction.
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