Pulse repetition rate scaling from 5 to 100 GHz with a high-power semiconductor disk laser
Pulse repetition rate scaling from 5 to 100 GHz with a high-power semiconductor disk laser
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DOI：
10.1364/oe.22.006099
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发表时间：
2014-03-10
期刊：
影响因子：
3.8
通讯作者：
Keller, Ursula
中科院分区：
文献类型：
--
作者：
Mangold, Mario;Zaugg, Christian A.;Keller, Ursula
这里研究的高功率半导体激光器是锁模集成外腔表面发射激光器（MIXSEL），它将垂直外腔表面发射激光器（VECSEL）的增益与半导体可饱和吸收镜（SESAM）的可饱和吸收体结合在单个半导体层堆叠中。 MIXSEL 概念允许在简单的直腔中实现稳定且自启动的基本无源锁模，平均功率缩放基于半导体盘激光器概念。此前，光泵浦 MIXSEL 的平均输出功率创下历史新高，但 17 ps 的长脉冲持续时间阻碍了更高的脉冲重复率和许多有趣的应用，例如超连续谱生成和宽带频率梳生成。最近，凭借新颖的 MIXSEL 结构，首次演示了飞秒操作。在这里，我们表明，通过机械改变线性直腔和输出耦合器的腔长，这种 MIXSEL 还可以支持从大约 5 GHz 到 >100 GHz 的脉冲重复率缩放，并具有出色的光束质量和高平均输出功率。在高达 15 GHz 的脉冲重复率下，我们获得了 >1 W 的平均输出功率和脉冲持续时间
The high-power semiconductor laser studied here is a modelocked integrated external-cavity surface emitting laser (MIXSEL), which combines the gain of vertical-external-cavity surface-emitting lasers (VECSELs) with the saturable absorber of a semiconductor saturable absorber mirror (SESAM) in a single semiconductor layer stack. The MIXSEL concept allows for stable and self-starting fundamental passive modelocking in a simple straight cavity and the average power scaling is based on the semiconductor disk laser concept. Previously record-high average output power from an optically pumped MIXSEL was demonstrated, however the long pulse duration of 17 ps prevented higher pulse repetition rates and many interesting applications such as supercontinuum generation and broadband frequency comb generation. With a novel MIXSEL structure, the first femtosecond operation was then demonstrated just recently. Here we show that such a MIXSEL can also support pulse repetition rate scaling from approximate to 5 GHz to >100 GHz with excellent beam quality and high average output power, by mechanically changing the cavity length of the linear straight cavity and the output coupler. Up to a pulse repetition rate of 15 GHz we obtained average output power >1 W and pulse durations