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arXiv 1901.05069physics.opticsphysics.app-ph
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石墨烯锁模laser产生亚20 fs脉冲

Generation of sub-20-fs pulses from a graphene mode-locked laser

Ferda Canbaz, Nurbek Kakenov, Coskun Kocabas, Umit Demirbas, Alphan Sennaroglu

摘要:

我们证明,据我们所知,最短的脉冲直接产生的日期从固体激光器,模式锁定与石墨烯可饱和吸收体(GSA)。在实验中,低阈值二极管泵浦的Cr ~(3+):LiSAF激光器被用于850 nm附近。在由两个泵浦二极管提供的275 mW的泵浦功率下,Cr 3+:LiSAF激光器产生了接近变换极限的19 fs脉冲,平均输出功率为8.5 mW。重复频率约为107 MHz,对应的脉冲能量和峰值功率分别为79 pJ和4.2 kW。一旦用GSA启动锁模,就可以获得稳定的、不间断的飞秒脉冲产生。此外,该激光器的飞秒激光输出可在836 nm ~ 897 nm范围内调谐,脉冲宽度在80-190 fs范围内。我们进一步在激光器的整个腔稳定性范围内进行了详细的锁模启动测试,以验证脉冲产生确实是由GSA而不是克尔透镜锁模启动的。

英文摘要:

We demonstrate, what is to our knowledge, the shortest pulses directly generated to date from a solid-state laser, mode locked with a graphene saturable absorber (GSA). In the experiments, a low-threshold diode-pumped Cr3+:LiSAF laser was used near 850 nm. At a pump power of 275 mW provided by two pump diodes, the Cr3+:LiSAF laser produced nearly transform-limited, 19-fs pulses with an average output power of 8.5 mW. The repetition rate was around 107 MHz, corresponding to a pulse energy and peak power of 79 pJ and 4.2 kW, respectively. Once mode locking was initiated with the GSA, stable, uninterrupted femtosecond pulse generation could be obtained. In addition, the femtosecond output of the laser could be tuned from 836 nm to 897 nm with pulse durations in the range of 80-190 fs. We further performed detailed mode locking initiation tests across the full cavity stability range of the laser to verify that pulse generation was indeed started by the GSA and not by Kerr lens mode locking.

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