Wang Yicheng, Chen Weidong, Mero Mark, Zhang Lizhen, Lin Haifeng, Lin Zhoubin, Zhang Ge, Rotermund Fabian, Cho Young Jun, Loiko Pavel, Mateos Xavier, Griebner Uwe, Petrov Valentin
Opt Lett. 2017 Aug 15;42(16):3076-3079. doi: 10.1364/OL.42.003076.
We present the first sub-100 fs bulk solid-state laser in the 2-μm spectral range employing the monoclinic Tm-dopedMgWO crystal as an active medium. By applying a graphene-based saturable absorber and chirped mirrors for dispersion management, stable self-starting mode-locked operation at 2017 nm was achieved. Nearly Fourier-limited pulses as short as 86 fs featuring a bandwidth of 53 nm were generated at a repetition rate of 76 MHz. A pulse energy of 1.1 nJ was achieved at 87 MHz for a pulse duration of 96 fs. The mode-locked Tm:MgWO laser exhibits excellent stability with a fundamental beat note extinction ratio of 80 dBc above noise level.
我们展示了首个采用单斜晶系掺铥钨酸镁（Tm:MgWO）晶体作为活性介质、波长在2μm光谱范围内的亚100飞秒块状固态激光器。通过应用基于石墨烯的可饱和吸收体和啁啾镜进行色散管理，实现了在2017nm波长下稳定的自启动锁模运转。以76MHz的重复频率产生了近傅里叶极限的脉冲，脉宽短至86飞秒，带宽为53nm。在87MHz重复频率、96飞秒脉宽下实现了1.1nJ的脉冲能量。锁模Tm:MgWO激光器表现出优异的稳定性，基波拍频消光比高于噪声水平80dBc。
