Liu Shande, Wang Peifu, Li Kuan, Lv Jiawen, Jin Yicheng, Xu Xiaodong, Wang Zhanxin, Liu Jian, Liu Junting, Zhao Yongguang
Opt Express. 2024 Feb 26;32(5):7513-7519. doi: 10.1364/OE.519238.
Tm,Ho:CaYLuAlO (Tm,Ho:CALYLO) crystal has wide emission spectra both for π-polarization and σ-polarization, showing significant potential for the generation of ultrashort pulses. Here, a widely tunable and passively mode-locked laser operation based on Tm,Ho:CALYLO crystal under two polarizations was demonstrated for what we believe to be the first time ever. For π-polarization, a maximum output power of 1.52 W and a tuning range of 255.3 nm were achieved in the continuous wave (CW) regime. In the mode-locked regime, a pulse duration of 68 fs and an average output power of 228 mW were achieved upon GaSb-based semiconductor saturable absorber mirror (SESAM). As for σ-polarization, a broader tuning range of 267.1 nm was realized, leading to the shorter pulse duration of 58 fs at 79.7 MHz repetition rate.
Tm,Ho:CaYLuAlO（Tm,Ho:CALYLO）晶体对于π偏振和σ偏振都具有宽发射光谱，显示出产生超短脉冲的巨大潜力。在此，我们首次展示了基于Tm,Ho:CALYLO晶体在两种偏振下的广泛可调谐且被动锁模激光运转。对于π偏振，在连续波（CW）模式下实现了1.52 W的最大输出功率和255.3 nm的调谐范围。在锁模模式下，基于GaSb的半导体可饱和吸收镜（SESAM）实现了68 fs的脉冲持续时间和228 mW的平均输出功率。至于σ偏振，实现了267.1 nm的更宽调谐范围，在79.7 MHz重复频率下产生了58 fs的更短脉冲持续时间。
