Towards self-mode locking of AlGaInP-VECSELs (Conference Presentation)
Towards self-mode locking of AlGaInP-VECSELs (Conference Presentation)
复制标题
AlGaInP-VECSEL 的自锁模（会议演示）
DOI：
10.1117/12.2252473
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
P. Michler
中科院分区：
文献类型：
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作者：
R. Bek;Q. Duong-Ederer;M. Vaupel;H. Kahle;T. Schwarzbäck;A. Rahimi-Iman;M. Jetter;M. Koch;P. Michler
自2000年以来，半导体可饱和吸收镜（SESAM）已被用于实现垂直外腔表面发射激光器（VECSEL）的锁模，实现飞秒脉冲持续时间、GHZ重复率和数瓦的平均输出功率。尽管取得了这些优异的结果，但必须仔细调整增益结构的 SESAM 可能成为开发具有成本效益的脉冲激光系统的限制因素。近年来，VECSEL锁模的新概念——自锁模技术被提出。虽然这种锁模背后的机制尚未完全解释，但大多数出版物都关注克尔透镜的影响。我们基于有源区克尔透镜的假设，首次对具有不同腔几何形状的红光 AlGaInP-VECSEL 进行无 SESAM 锁模实验。我们的半导体样品是通过金属有机气相外延生长的，有源区域包含嵌入 AlGaInP 势垒和包覆层中的 GaInP 量子阱。为了利用克尔透镜效应，在腔体内放置一条狭缝作为硬孔径。当波束宽度受到限制时，通过示波器和自相关测量来观察脉冲操作。正在进行的研究重点是脉冲激光的详细表征，以提高对所获得的无 SESAM 锁模操作的理解。
Since 2000, semiconductor saturable absorber mirrors (SESAMs) have been used to realize mode locking of vertical external-cavity surface-emitting lasers (VECSELs), achieving femtosecond pulse durations, GHZ repetition rates and several Watts of average output power. Despite these excellent results, SESAMs which have to be carefully adjusted to the gain structure can be a limiting factor for the development of a cost-effective pulsed laser system. In recent years, a new concept of VECSEL mode locking, the self-mode locking technique, has been demonstrated. While the mechanism behind this kind of mode locking is not yet fully explained, most publications focus on the effect of Kerr lensing.We present first experiments on SESAM-free mode locking of red-emitting AlGaInP-VECSELs with different cavity geometries based on the assumption of Kerr lensing in the active region. Our semiconductor samples are grown by metal-organic vapor-phase epitaxy with an active region containing GaInP quantum wells embedded in AlGaInP barriers and cladding layers. In order to exploit the effect of Kerr lensing, a slit is placed inside the cavity acting as a hard aperture. When the beam width is confined, pulsed operation is observed by oscilloscope and autocorrelation measurements. Ongoing research is focusing on a detailed characterization of the pulsed laser to improve one's understanding of the obtained SESAM-free mode-locked operation.