A5071533192- Spectroscopy and Laser Applications
- Photonic and Optical Devices
- Terahertz technology and applications
- Atmospheric Ozone and Climate
- Semiconductor Lasers and Optical Devices
- Photonic Crystals and Applications
- Mechanical and Optical Resonators
- Gyrotron and Vacuum Electronics Research
- Atmospheric chemistry and aerosols
- Advanced Fiber Laser Technologies
- Topological Materials and Phenomena
Beijing Academy of Quantum Information Sciences
2024
Abstract Topological lasers (TLs) have attracted widespread attention due to their mode robustness against perturbations or defects. Among them, electrically pumped TLs gained extensive research interest advantages of compact size and easy integration. Nevertheless, limited studies on been reported in the terahertz (THz) telecom wavelength ranges with relatively low output powers, causing a wide gap between practical applications. Here, we introduce surface metallic Dirac-vortex cavity...
Dual‐comb spectrometer based on quantum cascade lasers (QCLs) is gaining fast development and revolutionizing the precision measurement with high‐frequency temporal resolutions. In these measurements, high‐bandwidth photodetectors are normally used for signal acquisition processing, which complicates system. QCL well‐known its picosecond gain‐recovery time an intrinsic bandwidth of tens GHz. this work, a compact self‐detecting dual‐comb spectroscopy (DCS) demonstrated dispersion‐engineered,...
Abstract High-power terahertz (THz) quantum cascade laser, as an emerging THz solid-state radiation source, is attracting attention for numerous applications including medicine, sensing, and communication. However, due to the sub-wavelength confinement of waveguide structure, direct beam brightness upscaling with device area remains elusive several mode competition external optical lens normally used enhance brightness. Here, we propose a metallic photonic crystal resonator phase-engineered...
Abstract We demonstrated a scheme of phase-locked terahertz quantum cascade lasers (THz QCLs) array, with single-mode pulse power 108 mW at 13 K. The device utilizes Talbot cavity to achieve phase locking among five ridge first-order buried distributed feedback (DFB) grating, resulting in nearly times amplification the power. Due optimum length depends on wavelength, combination DFB grating leads better than multimode Fabry−Perot (F−P) cavities. facet reflects light back array direction and...
<title>Abstract</title> A spectral-switchable longwave quantum cascade laser design emitting at 10.5 μm is reported. The active region features a multi-miniband transition for broad and multi-band operations. Spectral-switchability between λ~8.59-9.67 10.20-10.68 achieved from Littrow external cavity device by varying the voltages. maximum peak power room temperature continuous wave 298 K 1.4 W 0.32 W, respectively. This multi-spectra switchable source would be ideal selective multi-gas...