Declan Marah
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High power sub-200fs pulse generation from a colliding pulse modelocked VECSEL Open
We present a passive and robust mode-locking scheme for a Vertical External Cavity Surface Emitting Laser (VECSEL). We placed the semiconductor gain medium and the semiconductor saturable absorber mirror (SESAM) strategically in a ring cav…
Colliding pulse mode locking of vertical-external-cavity surface-emitting laser Open
High-power semiconductor disk lasers producing short pulses at high repetition rates are attractive for numerous applications. The peak power achievable is often limited by the stability of the mode-locked regime as harmonic mode locking o…
Sub-picosecond pulse stability of passively mode-locked two-section quantum dash laser at ~ 1550 nm subject to single and dual optical feedback Open
We report effects of varying feedback ratios and phases in dual-loop external optical feedback on phase-noise characteristics of passively mode-locked two-section quantum-dash lasers. Optimal feedback yields similar to 100x reductions in R…
Sub-kHz RF linewidth of quantum-dash mode-locked laser by self-injection from symmetric dual-loop feedback and fiber delay Open
Sub-kHz RF-linewidth was demonstrated in two-section quantum-dash mode-locked lasers emitting near 1550 nm and 20 GHz repetition-rate using symmetric dual-loop and fiber delay. Compared to free-running lasing, RF-linewidth and timing-jitte…