Short pulse generation from a graphene-coupled passively mode-locked terahertz laser
Short pulse generation from a graphene-coupled passively mode-locked terahertz laser
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DOI：
10.1038/s41566-023-01195-z
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发表时间：
2022-09
期刊：
影响因子：
35
通讯作者：
E. Riccardi;V. Pistore;Seong-Riong D. Kang;Lukas Seitner;Anna De Vetter;C. Jirauschek;J. Mangeney;Lianhe H. Li;A. Davies;E. Linfield;A. Ferrari;S. Dhillon;M. Vitiello
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文献类型：
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作者：
E. Riccardi;V. Pistore;Seong-Riong D. Kang;Lukas Seitner;Anna De Vetter;C. Jirauschek;J. Mangeney;Lianhe H. Li;A. Davies;E. Linfield;A. Ferrari;S. Dhillon;M. Vitiello
产生具有大瞬时强度的超短（飞秒到皮秒）太赫兹频率辐射脉冲的稳定序列是研究计量学和超高速通信的光-物质相互作用的基本要求。在固态电泵浦激光器中，产生短脉冲的主要途径是通过被动锁模;然而，这在太赫兹范围内尚未实现，这是过去二十年来最长的目标之一。事实上，被动锁模的实现一直被认为是固有的阻碍与太赫兹激光器的子带间增益的快速恢复时间。在这里，我们展示了一个自启动的小型化短脉冲太赫兹激光器，利用一个原始的设备架构，包括表面图案化的多层石墨烯可饱和吸收体分布沿着整个腔的双金属半导体2.30-3.55太赫兹线激光器。具有4.0 ps长脉冲的自启动脉冲发射被证明是在一个紧凑的，全电子的，全被动的和廉价的配置。
The generation of stable trains of ultrashort (femtosecond to picosecond), terahertz-frequency radiation pulses with large instantaneous intensities is an underlying requirement for the investigation of light–matter interactions for metrology and ultrahigh-speed communications. In solid-state electrically pumped lasers, the primary route to generate short pulses is through passive mode-locking; however, this has not yet been achieved in the terahertz range, defining one of the longest standing goals over the past two decades. In fact, the realization of passive mode-locking has long been assumed to be inherently hindered by the fast recovery times associated with the intersubband gain of terahertz lasers. Here we demonstrate a self-starting miniaturized short pulse terahertz laser, exploiting an original device architecture that includes the surface patterning of multilayer-graphene saturable absorbers distributed along the entire cavity of a double-metal semiconductor 2.30–3.55 THz wire laser. Self-starting pulsed emission with 4.0-ps-long pulses is demonstrated in a compact, all-electronic, all-passive and inexpensive configuration.