太赫兹辐射
激光器
光电子学
飞秒
材料科学
皮秒
超短脉冲
光学
模式锁定
照相混合
饱和吸收
光学整流
石墨烯
半导体激光器理论
半导体
远红外激光器
光纤激光器
非线性光学
物理
纳米技术
太赫兹超材料
作者
Elisa Riccardi,Valentino Pistore,Seonggil Kang,Lukas Seitner,Anna De Vetter,Christian Jirauschek,J. Mangeney,Lianhe Li,A. G. Davies,E. H. Linfield,Andrea C. Ferrari,Sukhdeep Dhillon,Miriam S. Vitiello
出处
期刊:Nature Photonics
[Springer Nature]
日期:2023-04-20
卷期号:17 (7): 607-614
被引量:6
标识
DOI:10.1038/s41566-023-01195-z
摘要
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. A passively mode-locked quantum cascade laser (QCL) is developed by employing a heterogeneous gain medium and integrating graphene saturable absorbers along the entire QCL waveguide. Self-starting optical pulses of 4.0 ps are electrically generated in the 2.30–3.55 THz frequency range.
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