Detection and Investigation of Pulse Asymmetries in Passively Mode-Locked Quantum-Dot Laser Diodes Using Dispersion-Scan

Tiago dos Santos Gomes, Helder Crespo, Maria Ana Cataluna

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Mode-locked laser diodes are low-cost, compact and wall-plug efficient sources of ultrashort pulses. However, they suffer from a range of coherence instabilities when trying to achieve higher average powers and lower pulse widths. Existing techniques, such as Frequency-Resolved Optical Gating (FROG), fail when trying to characterize unstable pulses. Here, for the first time, we apply dispersion-scan (d-scan) [1] to the characterization of pulses from mode-locked laser diodes. D-scan is a pulse retrieval technique based on the measurement of a nonlinear signal as a function of the dispersion applied to the pulse, enabling both its full characterization in the time domain, as well as its compression. With this approach, we were able to fully characterize and compress pulses from a quantum-dot (QD) mode-locked laser diode and to achieve pulse widths in the sub-ps regime.
Original languageEnglish
Title of host publication2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)
ISBN (Electronic)9798350345995
Publication statusPublished - 4 Sept 2023

Cite this