Diode-pumped Q-switched Tm:LuAG ring laser operation at room temperature

Dual-loss-modulated passively Q-switched Tm:LuAG laser with multi-walled carbon nanotube and monolayer graphene

“…Besides, a large thermal conductivity of 7.9 W/mK could remove the generated heat efficiently when being pumped, which is very helpful for short-pulse operation [20]. Up to now, both the active and passive Q-switching Tm:LuAG lasers have been achieved [14,19]. With acoustic-optical modulator (AOM) as Q-switcher, pulse with the shortest duration of 199 ns under a repetition rate of 20 Hz has been achieved, while the complex experimental facilities and low repetition rate limited its applications.…”

“…As a member of Tm-doped crystals, Tm:LuAG was deemed to be a promising gain material for solid-state 2 μm lasers. The strong crystal field in Tm:LuAG crystal provides a large stark-splitting in the Tm 3+ ions, which could decrease the thermally induced population in the ground-state level and subsequently lower the laser threshold [19]. Moreover, a fluorescence lifetime as high as 7.1 ms indicates a promising high energy storage capacity [19].…”

“…The strong crystal field in Tm:LuAG crystal provides a large stark-splitting in the Tm 3+ ions, which could decrease the thermally induced population in the ground-state level and subsequently lower the laser threshold [19]. Moreover, a fluorescence lifetime as high as 7.1 ms indicates a promising high energy storage capacity [19]. Besides, a large thermal conductivity of 7.9 W/mK could remove the generated heat efficiently when being pumped, which is very helpful for short-pulse operation [20].…”

Actively Q-switched laser performance of Nd:LuAG crystal with birefringence compensator

“…For laser-diode (LD) pumped solid state laser, gain medium is the most important element, and it has attracted considerable attentions. Until now, different types of solid-state laser media for 1 lm emission have been successfully synthesized, such as widely used Nd:YAG, Nd:YVO 4 , and Nd:YLF crystals, et al Among those media, lutetium aluminum garnet, Lu 3 Al 5 O 12 (LuAG), which belongs to the cubic-type crystal system, is considered a promising laser host for laser-diode pumped solid state lasers (Chen et al 2012;Kasamatsu et al 1999;Dong et al 2007;Xu et al 2012;Di et al 2011;Aman and Aman 2013;Chang et al 2013;Chen et al 2014). As an active material, Nd:LuAG has key merits for laser-diode pumping such as large thermal conductivity of 9.6 W/(mÁK) (Kuwano et al 2004), long fluorescence lifetime of 277 ls (Xu et al 2009), and wide absorption spectrum width around 809 nm pumping wavelength.…”

121 W passively mode-locked Tm:LuAG laser

“…Very recently, we have also realized a CW Tm:LuAG laser with a comparable maximum average output power of 4.42 W, and a slope efficiency as high as 49.5% was obtained [25]. Moreover, wavelength tunable and Q-switched Tm:LuAG lasers have been realized with Watts-level output power [26,27]. The above results also show that Tm:LuAG lasers emit long wavelengths within the spectral range ~2018-2029 nm where the atmospheric transmission window is located [25].…”