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oe1(光电查) - 科学论文

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?? 中文（中国） ▾

  • [IEEE 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Paris, France (2019.9.1-2019.9.6)] 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Generation of a guided mode in a THz semiconductor waveguide using excitation by a tilted optical pulse front

    摘要： We employ tilted-pulse-front techniques to control the propagation direction of the THz pulses emitted from photo-excited semiconductors. At a proper tilt angle of the optical pulse front, the generated THz pulse propagates along a waveguide on the semiconductor surface and eventually emits from the end facet of the semiconductor structure. This work aims at an investigation of semiconductor quantum structures with gain excited just in time when the THz pulse to be amplified arrives.

    关键词： tilted optical pulse front,guided mode,THz,semiconductor waveguide

    更新于2025-09-16 10:30:52

  • Two-frequency laser with distributed feedback formed by a space charge wave

    摘要： The regimes of amplification and generation of optical TE waves arising on a grating formed by a space charge wave (SCW) in a plane optical waveguide based on an n-GaAs semiconductor are considered. For the perturbed n-GaAs waveguide, the reflectance and transmittance of TE modes with the same indices (m = n = 0) are calculated depending on the pump level and length of interaction between the optical and SCWs. It is shown that even with a relatively small depth of modulation of the dielectric constant (Δ?? ≈ 10?5) under conditions of high optical pumping (with an amplification factor ?? ≈ 150 cm?1) and corresponding SCW-optical interaction length, there is a possibility of not only amplification, but also generation of forward and backward optical modes at a wavelength of 10.6?μm. The results can be used to create tunable semiconductor laser generators based on the SCW-optical interaction and operating in the near and mid-IR range.

    关键词： Semiconductor waveguide,GaAs,Space charge wave,Laser generation

    更新于2025-09-12 10:27:22