As passive modulators in passively locked fiber lasers, tunable absorbers play an important role in the generation of ultrashort pulses. Germanene, a graphene-like two-dimensional material with a fast carrier relaxation time and a large nonlinear absorption coefficient comparable to graphene, is a saturated absorbent with a very fast response.
Researchers led by Professor Wei Xia at Jinan University (UJN) are interested in modulation switches in fiber lasers, and two-dimensional material saturated absorbers have been a hot research topic in recent years.
Two-dimensional materials produce drawbacks such as traditional synthetic saturable absorbers such as nonlinear polarization rotation and nonlinear amplification loop glass with poor environmental stability and complex structure. Germanine, as a two-dimensional material, has excellent nonlinear optical properties, and fully exploring its potential performance has a positive contribution to the development of passive modulators.
Researchers predict its potential applications. Using it as a saturable absorber, pulses such as femtosecond pulses and high-energy noise can be obtained.
The work has been published in the Journal Frontiers of Optoelectronics.
Baohao Xu et al, Two types of ultrafast mode-locking operations from an Er-doped fiber laser based on germanene nanosheets, Frontiers of Optoelectronics (2023) DOI: 10.1007/s12200-023-00068-1
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