中国激光, 2019, 46 (8): 0808002, 网络出版: 2019-08-13
基于反射式MoS2可饱和吸收体调Q 锁模Tm∶LuAG激光器 下载: 1052次
Passively Q -Switched Mode-Locked Tm∶LuAG Laser with Reflective MoS2 Saturable Absorber
激光器 Tm∶LuAG; MoS2可饱和吸收体 调Q锁模 调制深度 lasers Tm∶LuAG; MoS2 saturable absorber Q-switched mode-locked modulation depth
摘要
采用反射式MoS2可饱和吸收体在Tm∶Lu3Al5O12激光器中实现了被动调Q 锁模(QML)运转。以可调谐掺钛蓝宝石激光器为抽运源,结合低阈值腔设计,选用透射率为3%的输出镜获得525 mW的出光阈值。当吸收抽运功率达到1743 mW时,激光器处于稳定的被动调Q 锁模运行状态。当最大抽运功率达到3.1 W时,激光器被动调Q 锁模输出功率为306 mW,斜效率为14.3%,中心波长为2023 nm,对应的锁模脉冲序列的重复频率为106.4 MHz,最大的单脉冲能量为2.88 nJ,调制深度接近100%。结果表明,反射式MoS2可饱和吸收体在2 μm波段激光锁模中具有良好的应用前景。
Abstract
The passively Q-switched mode-locked (QML) operation of a Tm∶Lu3Al5O12 laser is experimentally demonstrated by employing the reflective MoS2 as a saturable absorber mirror. An absorbed pump threshold of 525 mW with a 3% output mirror is achieved using a tunable Ti-doped sapphire laser as the pumping source and a low-threshold cavity design. Further, a stable QML operation state is obtained when the absorbed pump power is 1743 mW. When the maximum pump power is 3.1 W, the Q-switched mode-locked output power is 306 mW, the slope efficiency is 14.3%, the central wavelength is 2023 nm, the repetition rate is 106.4 MHz, and the maximum single pulse energy is 2.88 nJ. Furthermore, the modulation depth is observed to be close to 100%. The results show that the reflective MoS2 saturable absorber has a potential application in 2 μm laser mode-locked.
令维军, 孙锐, 陈晨, 张亚妮, 康翠萍, 许强, 董忠. 基于反射式MoS2可饱和吸收体调