Self-mode-locking semiconductor disk laser.
Self-mode-locking semiconductor disk laser.
复制标题
自锁模半导体盘激光器。
DOI：
10.1364/oe.22.028390
复制
发表时间：
2014
期刊：
影响因子：
3.8
通讯作者：
M. Koch
中科院分区：
文献类型：
--
作者：
M. Gaafar;P. Richter;H. Keskin;C. Möller;M. Wichmann;W. Stolz;A. Rahimi‐Iman;M. Koch
在过去的14年里，锁模半导体盘形激光器的发展受到了极大的关注，这种脉冲激光器仍有巨大的潜力有待开发和利用。虽然十多年来脉冲操作与可饱和吸收体的使用密切相关，但自锁模最近作为该领域中的有效和新颖的技术出现-为降低这种激光器的复杂性和提高成本效率提供了前景。在这项工作中，我们强调了自锁模半导体器件的最新成就。值得注意的是，虽然在活性介质中的非线性效应预计会引起自锁模，这必须在未来的实验中仔细研究。然而，有一个争议是否与自锁模的结果真正显示锁模。这些问题在这项工作中得到解决，我们提供了一个明确的证据，锁模的饱和吸收体的自由设备。通过在腔外使用BBO晶体，演示了利用外耦合激光束产生二次谐波产生的绿色光。此外，长时间跨度的脉冲序列，以及射频谱测量，我们的亚ps脉冲在500 MHz的重复率，这表明我们的设备的稳定的脉冲操作。此外，一个长时间跨度的自相关跟踪的介绍，清楚地表明没有一个基座或双脉冲。最后，光束轮廓测量揭示了我们的设备具有良好的光束质量与M平方因子小于1.1的两个轴，表明自锁模可以实现的基本横模。
The development of mode-locked semiconductor disk lasers received striking attention in the last 14 years and there is still a vast potential of such pulsed lasers to be explored and exploited. While for more than one decade pulsed operation was strongly linked to the employment of a saturable absorber, self-mode-locking emerged recently as an effective and novel technique in this field - giving prospect to a reduced complexity and improved cost-efficiency of such lasers. In this work, we highlight recent achievements regarding self-mode-locked semiconductor devices. It is worth to note, that although nonlinear effects in the active medium are expected to give rise to self-mode-locking, this has to be investigated with care in future experiments. However, there is a controversy whether results presented with respect to self-mode-locking truly show mode-locking. Such concerns are addressed in this work and we provide a clear evidence of mode-locking in a saturable-absorber-free device. By using a BBO crystal outside the cavity, green light originating from second-harmonic generation using the out-coupled laser beam is demonstrated. In addition, long-time-span pulse trains as well as radiofrequency-spectra measurements are presented for our sub-ps pulses at 500 MHz repetition rate which indicate the stable pulse operation of our device. Furthermore, a long-time-span autocorrelation trace is introduced which clearly shows absence of a pedestal or double pulses. Eventually, a beam-profile measurement reveals the excellent beam quality of our device with an M-square factor of less than 1.1 for both axes, showing that self-mode-locking can be achieved for the fundamental transverse mode.
被动谐波锁模垂直外腔面发射激光器，以 147 GHz 重复频率发射 1.1 ps 脉冲
影响因子：
4
作者：
Quarterman A
通讯作者：
Quarterman A