4 papers
Quantum cascade laser roadmap
Carlo Silvestri, Aleksandar D. RakiÄ, Dragan Indjin +46
Quantum cascade lasers (QCLs) are unipolar semiconductor lasers first demonstrated in 1994. Since then, they have played a central role in advancing mid-infrared and terahertz phot…
Mode Switching Through Exceptional Points Induced by Lasing-Inversion Coupling
Xingwei Gao, Cheng Guo, David Burghoff
The gain-loss coupling in optical cavities induces exceptional points (EPs), where two optical modes coalesce. The large modal overlap near an EP intensifies gain competition, favo…
Rubber band filters: optimal padding without edge artifacts
Zhenyang Xiao, David Burghoff
Bandpass filtering techniques are widely used in spectroscopy. However, conventional symmetric-padding filtering methods introduce boundary artifacts that distort the signal at the…
Liquid combs: broadband light with equidistance and without stability
Mithun Roy, Tianyi Zeng, Zhenyang Xiao +4
Broadband light sources with well-defined spectral structures are vital for science and technology. However, the evenly spaced lines of frequency combs represent only a small subse…