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Laser-micromachined zebra-patterned graphene as a mode locker with adjustable loss

机译：激光微机械斑马图案石墨烯作为模式储物柜，具有可调节损耗

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In this Letter, we describe a novel, to the best of our knowledge, device based on micro-structured graphene, referred to as zebra-patterned graphene saturable absorber (ZeGSA), which can be used as a saturable absorber with adjustable loss to initiate femtosecond pulse generation. Femtosecond laser micro-machining was employed to ablate monolayer graphene on an infrasil substrate in the form of stripes with a different duty cycle, resulting in the formation of regions with variable insertion loss in the 0.21%-3.12% range. The mode-locking performance of the device was successfully tested using a Cr4+: forsterite laser, operating near 1250 nm. In comparison with mode locking using non-ablated graphene, the ZeGSA device with regions of decreasing graphene, enabled improved power performance where the mode-locked output power increased from 68 mW to 114 mW, and the corresponding pulse duration decreased from 62 to 48 fs at the same incident pump power of 6.3 W. These experiments indicate that ZeGSA shows great potential as a laser mode locker with adjustable loss and that it should find applications in the development of femtosecond lasers over a broad spectral range. (C) 2020 Optical Society of America
机译：在这种信，我们描述了一种新颖的，基于微结构化的石墨烯中，被称为斑马纹的石墨烯可饱和吸收体（ZeGSA），其可被用作可饱和吸收体以可调节的损失以引发我们所知，设备的飞秒脉冲产生。飞秒激光微加工中使用的消融单层石墨烯在具有不同占空比的条纹形式的infrasil基板上，导致与在0.21％-3.12％的范围内可变的插入损耗的形成区域。该装置的锁模性能使用的Cr4 +试验成功：镁橄榄石激光器，近1250纳米工作。与模式使用非烧蚀石墨烯锁定比较，以减小石墨烯的区域ZeGSA设备，使能改进的动力性能，其中锁模输出功率从68毫瓦增加到114毫瓦，以及相应的脉冲持续时间从62减少到48个fs的在6.3 W的相同的泵浦功率这些实验表明，ZeGSA显示出巨大的潜力，可调节的损失激光模式更衣室，并应找到飞秒激光器的开发应用在广泛的光谱范围内。 （c）2020美国光学学会

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