58 citations · 107 across the 5 of their papers we have counts for
5 papers
Random-laser dynamics with temporally modulated pump
Stefan Bittner, Sebastian Knitter, Seng Fatt Liew +1
We present an experimental study of the effects of temporal modulation of the pump intensity on a random laser. The nanosecond pump pulses exhibit rapid intensity fluctuations whic…
Intracavity frequency-doubled degenerate laser
Seng Fatt Liew, Sebastian Knitter, Sascha Weiler +5
We develop a green light source with low spatial coherence via intracavity frequency doubling of a solid-state degenerate laser. The second harmonic emission supports many more tra…
Coherence switching of a degenerate VECSEL for multimodality imaging
Sebastian Knitter, Changgeng Liu, Brandon Redding +3
We demonstrate a VECSEL (vertical external cavity surface emitting laser) based degenerate source with an adjustable degree of spatial coherence that is electrically pumped, mechan…
Topological defect lasers
Sebastian Knitter, Seng Fatt Liew, Wen Xiong +3
We demonstrate topological defect lasers in a GaAs membrane with embedded InAs quantum dots. By introducing a disclination to a square-lattice of elliptical air holes, we obtain sp…
Photonic crystals with topological defects
Seng Fatt Liew, Sebastian Knitter, Wen Xiong +1
We introduce topological defect to a square lattice of elliptical cylinders. Despite the broken translational symmetry, the long-range positional order of the cylinders leads to re…