5 papers
Engineering the spectral bandwidth of quantum cascade laser frequency combs
Maximilian Beiser, Nikola Opačak, Johannes Hillbrand +2
Quantum cascade lasers (QCLs) facilitate compact optical frequency comb sources that operate in the mid-infrared and terahertz spectral regions, where many molecules have their fun…
Frequency comb generation by Bloch gain induced giant Kerr nonlinearity
Nikola Opačak, Sandro Dal Cin, Johannes Hillbrand +1
Optical nonlinearities are known to provide a coherent coupling between the amplitude and phase of the light, which can result in the formation of periodic waveforms. Lasers that e…
Mode-locked ultrashort pulses from an 8 m wavelength semiconductor laser
Johannes Hillbrand, Nikola Opacak, Marco Piccardo +4
Quantum cascade lasers (QCL) have revolutionized the generation of mid-infrared light. Yet, the ultrafast carrier transport in mid-infrared QCLs has so far constituted a seemingly…
In-phase and anti-phase synchronization in a laser frequency comb
Johannes Hillbrand, Dominik Auth, Marco Piccardo +5
Coupled clocks are a classic example of a synchronization system leading to periodic collective oscillations. This phenomenon already attracted the attention of Christian Huygens b…
Theory of frequency modulated combs in lasers with spatial hole burning, dispersion and Kerr
Nikola Opačak, Benedikt Schwarz
Frequency modulated (FM) frequency combs constitute an exciting alternative to generate equidistant spectra. The full set of Maxwell-Bloch equations is reduced to a single master e…