“…Indeed, it has been shown that Ce:LLF exhibits much better laser performance than Ce:YLF [15]. In the case of Nd doping as well, LLF system has a 1047 nm emission bandwidth 25% larger than Nd:YLF, which makes it very promising for laser mode-locked operation [16]. Moreover, in a recent work [17], Tm-Ho co-doped LLF showed better laser performance than YLF as eye safe laser at 2 m. Therefore, we investigated Yb 3+ -doped LLF as a laser material and compared it with Yb 3+ -doped YLF.…”