Ultrafast absorption recovery dynamics of 1300 nm quantum dot saturable absorber mirrors
Ultrafast absorption recovery dynamics of 1300 nm quantum dot saturable absorber mirrors
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DOI：
10.1063/1.3186081
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发表时间：
2009-07
影响因子：
4
通讯作者：
M. Lumb;E. Clarke;E. Harbord;P. Spencer;R. Murray;F. Masia;P. Borri;W. Langbein;C. Leburn;C. Jappy;N. K. Metzger;C. Brown;W. Sibbett
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文献类型：
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作者：
M. Lumb;E. Clarke;E. Harbord;P. Spencer;R. Murray;F. Masia;P. Borri;W. Langbein;C. Leburn;C. Jappy;N. K. Metzger;C. Brown;W. Sibbett
我们比较了两个量子点可饱和吸收镜的性能，其中一个器件工作在量子点基态跃迁，另一个器件工作在第一激发态跃迁。时间分辨光致发光和外差四波混频实验表明，与基态器件相比，激发态器件恢复得更快。两种装置均获得了飞秒脉冲，其中基态装置在铬镁橄榄石激光器中产生91ps脉冲，激发态装置产生86ps脉冲。快速吸收恢复动力学表明了利用激发态跃迁的器件用于高重复频率激光器的潜力。
We compare the performance of two quantum dot saturable absorber mirrors with one device operating at the quantum dot ground state transition whereas the other operates at the first excited state transition. Time-resolved photoluminescence and heterodyne four-wave mixing experiments demonstrate faster recovery of the excited-state device compared to the ground-state device. Femtosecond pulses were achieved with both devices, with the ground-state device producing 91 fs pulses and the excited-state device producing 86 fs pulses in a Cr:forsterite laser. The fast absorption recovery dynamics indicates the potential of devices exploiting excited-state transitions for use in high repetition rate lasers.