调Q锁模运转的Tm∶ZBLAN薄片激光器

Q-Switched Mode-Locked Thin-Disk Tm∶ZBLAN Laser

利用特殊的散热设计,在Tm∶ZBLAN玻璃激光器中实现连续和被动调Q锁模运转。分别采用透过率为1.5%、3%、5%的输出镜在激光连续运转时获得254 mW、296 mW、230 mW的最高输出功率。为了实现锁模运转,选用透过率为1.5%的输出镜,将透射式GaAs-SESAM作为锁模元件,出光阈值仅为131 mW,当吸收泵浦功率大于1.09 W时,实现了稳定的调Q锁模运转,最大输出功率为98 mW,调Q包络脉冲宽度为6μs,重复频率为19.23 kHz,调Q包络下脉冲的重复频率为102 MHz,脉冲宽度约为800 ps,最大单脉冲能量为0.96 nJ。

In this study,we have achieved novel continuous and passive Q-switched mode-locked operation in a Tm∶ZBLAN laser using a special crystal design.When the laser is in continuous operation,the maximum output power of 254,296,and 230 mW is obtained using 1.5%,3%,and 5%output mirrors,respectively.We use a 1.5%output mirror and transmission-type GaAs-SESAM as a mode-locking element to achieve a mode-locking operation.The absorbed pump threshold is as low as 131 mW.When the absorption pump power is greater than 1.09 W,a stable Qswitched mode-locking operation is achieved.The maximum output power is 98 mW,the pulse width of the Q-switched envelope is 6μs,the repetition frequency is 19.23 kHz,the repetition frequency of the pulse under the Q-switched envelope is 102 MHz,and the pulse width is about 800 ps.The maximum single-pulse energy is 0.96 nJ.