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Towards VECSEL frequency combs

机译:走向VECSEL频率梳

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Significant progress has been made over the last year towards generating frequency combs using VECSELs. Here, I will discuss recent progress made generating > 4kW peak power femtosecond pulse VECSELs, where we have achieved 3.3 W average power with 400 fs pulse duration at 1.7 GHz repetition rate. This has been achieved by exploiting the rapid power scaling progress made in the field of CW VECSELs . The gain structure used here is grown and processed by the University of Marburg, and the window layer is etched for anti-resonance to increase the gain bandwidth and reduce the dispersion . We have used this to generate supercontinuum, achieving 45 % throughput in a 2.2 micron core photonic crystal fiber when the VECSEL produced 1 W average output power. A continuum with a width of 175 nm is generated. At higher average powers heating of the fiber tip reduces coupling efficiency which limits the supercontinuum bandwidth and we will discuss measures to avoid this. Finally, I will outline approaches to further reduce the pulse length, whilst maintaining the average power, to a point where generating coherent octave spanning supercontinuum, suitable for F-2F stabilization should become a reality.
机译:去年,在使用VECSEL产生频率梳方面取得了重大进展。在这里,我将讨论在产生> 4kW峰值功率飞秒脉冲VECSEL方面的最新进展,在这里,我们以1.7 GHz重复频率获得了400 W脉冲持续时间下的3.3 W平均功率。这是通过利用CW VECSEL领域中的快速功率缩放进展来实现的。此处使用的增益结构由马尔堡大学(University of Marburg)生长和处理,并且对窗口层进行了蚀刻以产生反谐振,从而增加了增益带宽并减小了色散。我们使用它来产生超连续谱,当VECSEL产生1 W的平均输出功率时,在2.2微米纤芯的光子晶体光纤中实现了45%的吞吐量。产生了一个宽度为175 nm的连续体。在较高的平均功率下,光纤尖端的发热会降低耦合效率,从而限制了超连续谱带宽,我们将讨论避免这种情况的措施。最后,我将概述在保持平均功率的同时进一步减小脉冲长度的方法,以至于产生适合F-2F稳定的相干倍频程超连续谱。

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