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Graphene-Coupled Terahertz Semiconductor Lasers for Enhanced Passive Frequency Comb Operation.


ABSTRACT: Optical frequency combs, consisting of well-controlled equidistant frequency lines, have been widely used in precision spectroscopy and metrology. Terahertz combs have been realized in quantum cascade lasers (QCLs) by employing either an active mode-locking or phase seeding technique, or a dispersion compensator mirror. However, it remains a challenge to achieve the passive comb formation in terahertz semiconductor lasers due to the insufficient nonlinearities of conventional saturable absorbers. Here, a passive terahertz frequency comb is demonstrated by coupling a multilayer graphene sample into a QCL compound cavity. The terahertz modes are self-stabilized with intermode beat note linewidths down to a record of 700 Hz and the comb operation of graphene-coupled QCLs is validated by on-chip dual-comb measurements. Furthermore, the optical pulse emitted from the graphene-coupled QCL is directly measured employing a terahertz pump-probe technique. The enhanced passive frequency comb operation is attributed to the saturable absorption behavior of the graphene-integrated saturable absorber mirror, as well as the dispersion compensation introduced by the graphene sample. The results provide a conceptually different graphene-based approach for passive comb formation in terahertz QCLs, opening up intriguing opportunities for fast and high-precision terahertz spectroscopy and nonlinear photonics.

SUBMITTER: Li H 

PROVIDER: S-EPMC6794721 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature

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Graphene-Coupled Terahertz Semiconductor Lasers for Enhanced Passive Frequency Comb Operation.

Li Hua H   Yan Ming M   Wan Wenjian W   Zhou Tao T   Zhou Kang K   Li Ziping Z   Cao Juncheng J   Yu Qiang Q   Zhang Kai K   Li Min M   Nan Junyi J   He Boqu B   Zeng Heping H  

Advanced science (Weinheim, Baden-Wurttemberg, Germany) 20190823 20


Optical frequency combs, consisting of well-controlled equidistant frequency lines, have been widely used in precision spectroscopy and metrology. Terahertz combs have been realized in quantum cascade lasers (QCLs) by employing either an active mode-locking or phase seeding technique, or a dispersion compensator mirror. However, it remains a challenge to achieve the passive comb formation in terahertz semiconductor lasers due to the insufficient nonlinearities of conventional saturable absorbers  ...[more]

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