Passive mode locking of a ${\rm Tm}:{{\rm LuYO}_3}$ ceramic laser in the 2 µm spectral region is demonstrated by employing a single-walled carbon nanotube-saturable absorber. Almost chirp-free pulses as short as 57 fs, i.e., 8 optical cycles are produced at a repetition rate of 72.6 MHz (63 mW average power). The corresponding optical spectrum centered at 2045 nm, exhibits a bandwidth of 80 nm, which corresponds to almost chirp-free pulses. To the best of our knowledge, the results represent the shortest pulses generated by mode-locked Tm solid-state lasers.

中文翻译：

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SWCNT-SA锁模Tm：LuYO ₃陶瓷激光器以2.05 µm的波长提供8个光学周期的脉冲

通过使用单壁碳纳米管可饱和吸收体，证明了在2 µm光谱区域内的$ {\ rm Tm}：{{\ rm LuYO} _3} $陶瓷激光器的无源模式锁定。短至57 fs的几乎无chi脉冲，即8个光学周期，以72.6 MHz（平均功率63 mW）的重复频率产生。以2045 nm为中心的相应光谱呈现80 nm的带宽，这几乎与无chi脉冲相对应。据我们所知，结果表示锁模Tm固态激光器产生的最短脉冲。