News News
Contact us
  • Customer service number:64321087
  • Commercial service telephone:13918059423
  • Technical service telephone:13918059423
  • Contact person: Mr. Cui 
  • Service
  • Address: room 107, building 8, no. 100, guilin road, xuhui district, Shanghai

Butterfly effect: Hyperchaos of mid-infrared lasers

The date of: 2022-01-06
viewed: 2


Chaos, popular as butterfly effect, describes the irregular phenomenon of deterministic systems. Based on the unique features of sensitivity to initial conditions and unpredictability to future evolutions, chaos from laser diodes have found applications in private optical communication links, high-rate random number generations, Lidar systems, as well as recent optical computing networks. However, most light chaos are operated in the near-infrared regime, and hence the applications are limited to this spectral range as well.

A Chinese team of scientists, led by Professor Cheng Wang from ShanghaiTech University, China recently reported a mid-infrared hyperchaos source in Light: Science & Applications. The chaos generation relies on interband cascade lasers, one major type of laser sources in the mid-infrared regime. The lasers without any external perturbation usually produce continuous-wave output. In order to trigger the chaos production, the team applied an external perturbation named as optical feedback to the lasers. Optical feedback is a technique that the laser output is reflected back to the laser cavity through a reflection mirror. The delayed light interacts nonlinearly with the laser device and generates chaos under certain operation conditions.

In the 1980s, mid-infrared chaos has been produced from gas lasers including CO2 lasers and He-Xe lasers. However, the gas lasers are rather bulky and the chaos bandwidth is limited up to the megahertz range. In contrast, the chaos in interband cascade lasers, explored by the Chinese team, reaches the frequency coverage of gigahertz range. This broadband chaos is desirable for high-speed information processing and transmission. In particular, their analysis proved that the chaos owned several positive Lyapunov exponents rather than one. This suggests the chaos is the type of hyperchaos, which is of high-dimensional complexity. This high-order complexity is an essential requirement to implement secure communications in practice. In addition, the team pointed out that interband cascade lasers with optical feedback could produce hyperchaos within wide controlling parameter spaces, including the bias current condition, the feedback condition, as well as single or multimode lasing condition. “The broadband mid-infrared hyperchaos may enable applications in secure free-space communication links and remote chaotic Lidar systems,” the scientists anticipate, “This is because the atmosphere has low-loss transmission windows (3 to 5 μm and 8 to 12 μm) in the mid-infrared regime.”

Hot News / Related to recommend
  • 2022 - 05 - 27
    Click on the number of times: 1
    source:scienceAbstractThe study of subtle effects on transport in semiconductors requires high-quality epitaxial structures with low defect density. Using hybrid molecular beam epitaxy (MBE), SrTiO3 f...
  • 2022 - 05 - 26
    Click on the number of times: 1
    source:news.yaleScientists have found a new, nanoscale link between superconductivity — the flow of electric current without a loss of energy — and a phenomenon known as charge density waves.The disco...
  • 2022 - 05 - 25
    Click on the number of times: 1
    source:natureAbstractAn optimized sol–gel protocol was carried out to produce an yttrium aluminum garnet (YAG) xerogel from aluminum alkoxide and an yttrium salt on a semi-pilot scale. This xerogel wa...
  • 2022 - 05 - 24
    Click on the number of times: 0
    source:phys.orgResearchers at Northeastern have discovered a new quantum phenomenon in a specific class of materials, called antiferromagnetic insulators, that could yield new ways of powering 'sp...
  • Copyright ©Copyright 2018 2020 Shanghai rare earth association All Rights Reserved Shanghai ICP NO.2020034223
    the host:Shanghai Association of Rare Earth the guide:Shanghai Development and Application Office of Rare Earth the organizer:Shanghai rare earth industry promotion center