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The effect of spatial hole burning (SHB) on dual-wavelength self-mode-locked lasers based on physically combined Nd:YVO 4 ∕Nd:LuVO 4 and Nd:YVO 4 ∕Nd:KGW composite active medium is comparatively investigated. The length of the first Nd:YVO 4 crystal is optimized to realize a highly compact and efficient TEM 00 -mode picosecond laser at 1.06 μm with optical conversion efficiency greater than 20%. When the SHB effect is enhanced by decreasing the separation between the input end mirror and thedoi:10.1364/prj.2.000161 fatcat:r4l2gni2j5ctpbhdrs6euoz4lm