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采用结构简单、紧凑的直线腔设计,用单壁碳纳米管(SWCNT)为饱和吸收体,实现了激光二极管(LD)抽运Tm∶YAP晶体的2μm波段被动调Q和调Q锁模(QML)脉冲激光运转。当腔长为30mm时,实现了稳定的2μm被动调Q激光输出,抽运功率为8.64 W时,最大平均输出功率为507mW,最高重复频率26.91kHz,最窄脉宽262ns,相应的单脉冲能量18.8μJ。腔长增加到80mm时,得到调Q锁模激光运转,最大平均输出功率和调Q包络脉冲的最高重复频率分别为387mW和34.61kHz,调Q包络下锁模脉冲的重复频率为1.87GHz。
A simple and compact linear cavity design is adopted. The single-walled carbon nanotubes (SWCNTs) are used as the saturable absorber to realize the passive Q-switched and Q-switched Qmodulation (QML) in the 2μm band of laser diode (LD) pumping Tm: Pulse laser operation. When the cavity length is 30mm, a stable 2μm passive Q-switched laser output is achieved. When pumping power is 8.64 W, the maximum average output power is 507mW, the maximum repetition frequency is 26.91kHz and the narrowest pulse width is 262ns. The corresponding single-pulse energy 18.8μJ. When the cavity length is increased to 80mm, the Q-switched mode-locked laser is operated. The maximum average output power and the maximum repetition frequency of the Q-switched envelope pulse are 387mW and 34.61kHz, respectively. The repetition frequency of the mode-locked pulse under Q-envelope is 1.87GHz .