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HL: Fachverband Halbleiterphysik

HL 26: Poster II

HL 26.51: Poster

Mittwoch, 11. März 2026, 09:30–11:30, P1

Highspeed ultrafast spectroscopy via active synchronization of dual-comb lasers — •Simeon Schmitt, Julia Lang, and Georg Herink — University of Bayreuth, Germany

Dual-comb lasers enable ultrafast spectroscopic measurements at high speeds by generating optical delays without the motion of mechanical elements. According to the asynchronous optical sampling (ASOPS) scheme, pulses from two mode-locked lasers with detuned repetition rates are combined to automatically scan relative delays throughout the pulse period. In contrast, here, we present a novel approach which features flexible active synchronization of both lasers: Employing precisely timed electrical signals and fast electro-optical modulators, we achieve full control over the overall scanning process. This concentrates the scanning range to the region of interest by limiting it to several picoseconds, resulting in record fast scanning rates. Furthermore, the scanning resolution can be arbitrarily adjusted up to tens of THz by varying the repetition rate difference. We adopt this process to realize ultrafast acquisition speeds for rapid THz time domain spectroscopy and present first measurements.

Keywords: Dual comb lasers; Spectroscopy; THz; Semiconductor