Self-Induced Mode-Locking in Electrically Pumped Far-Infrared Random Lasers.
Self-Induced Mode-Locking in Electrically Pumped Far-Infrared Random Lasers.
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DOI：
10.1002/advs.202206824
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发表时间：
2023-03
期刊：
影响因子：
15.1
通讯作者：
Vitiello, Miriam S.
中科院分区：
文献类型：
--
作者：
Di Gaspare, Alessandra;Pistore, Valentino;Riccardi, Elisa;Pogna, Eva A. A.;Beere, Harvey E.;Ritchie, David A.;Li, Lianhe;Davies, Alexander Giles;Linfield, Edmund H.;Ferrari, Andrea C.;Vitiello, Miriam S.
锁模，即激光腔中电磁模式的自启动同步振荡，是产生超短光脉冲的主要方式。在随机激光器中，没有腔，锁模，低空间相干随机模式之间的非线性耦合，可以通过光泵浦激活，即使没有短脉冲的发射。在这里，通过利用半导体异质结构激光器固有的巨大三阶χ（3）非线性和石墨烯的非线性特性的组合，作者证明了在太赫兹频率下表面发射电泵浦随机量子级联激光器中的锁模。这通过光刻图案化多层石墨烯膜以限定光散射体的表面随机图案，或者通过在芯片上耦合可饱和吸收体石墨烯反射器来实现。模间拍音映射揭示了自然非相干随机模式之间的自诱导相位相干性。自混合模间光谱揭示了锁相随机模式。这是无序系统物理学的一个重要里程碑。它为新一代小型化电泵浦锁模光源的开发铺平了道路，是宽带光谱、无散斑成像应用和储层量子计算的理想选择。通过将多层石墨烯膜集成到光散射体的随机图案中或通过在芯片上耦合石墨烯反射器，在太赫兹频率下锁定表面发射电泵浦随机量子级联激光器中的低空间相干模式。自混合模间光谱揭示了锁相随机模式。
Mode locking, the self‐starting synchronous oscillation of electromagnetic modes in a laser cavity, is the primary way to generate ultrashort light pulses. In random lasers, without a cavity, mode‐locking, the nonlinear coupling amongst low spatially coherent random modes, can be activated via optical pumping, even without the emission of short pulses. Here, by exploiting the combination of the inherently giant third‐order χ (3) nonlinearity of semiconductor heterostructure lasers and the nonlinear properties of graphene, the authors demonstrate mode‐locking in surface‐emitting electrically pumped random quantum cascade lasers at terahertz frequencies. This is achieved by either lithographically patterning a multilayer graphene film to define a surface random pattern of light scatterers, or by coupling on chip a saturable absorber graphene reflector. Intermode beatnote mapping unveils self‐induced phase‐coherence between naturally incoherent random modes. Self‐mixing intermode spectroscopy reveals phase‐locked random modes. This is an important milestone in the physics of disordered systems. It paves the way to the development of a new generation of miniaturized, electrically pumped mode‐locked light sources, ideal for broadband spectroscopy, multicolor speckle‐free imaging applications, and reservoir quantum computing. Locking of low spatial coherence modes in surface‐emitting electrically pumped random quantum cascade lasers at terahertz frequencies, by either integrating a multilayer graphene film into the random pattern of light scatterers or by coupling a graphene reflector on chip. Self‐mixing intermode spectroscopy reveals phase‐locked random modes.
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影响因子：
4
作者：
Faist, J;Gmachl, C;Cho, AY
通讯作者：
Cho, AY
影响因子：
3.8
作者：
Aghamiri, Neda Alsadat;Huth, Florian;Abate, Yohannes
通讯作者：
Abate, Yohannes
影响因子：
35
作者：
Burghoff, David;Kao, Tsung-Yu;Hu, Qing
通讯作者：
Hu, Qing
影响因子：
3.6
作者：
Beiser, Maximilian;Opacak, Nikola;Schwarz, Benedikt
通讯作者：
Schwarz, Benedikt
影响因子：
5.6
作者：
Di Gaspare, Alessandra;Vitiello, Miriam S.
通讯作者：
Vitiello, Miriam S.