We demonstrate the deterministic control of femtosecond dual-comb soliton motion in an Er:fiber laser. Introducing fast intra-cavity modulation, we control individual solitons within two interlaced soliton combs in the harmonically-modelocked state. Upon extra-cavity recombination of both combs, we can obtain reconfigurable pulse pairs at arbitrary delays. Based on realtime spectroscopy, we resolve the transient inter-soliton trajectories.The approach employs laser-intrinsic soliton dynamics and provides all-optically swept pulse pairs for i.e. pump-probe spectroscopy at ⪆kHz scanning frequencies.
The novel field-resolved microscopy scheme of Quantum-probe Field Microscopy (QFIM) utilized fluorescence quanta to images local THz-electric waveforms [1]. In this contribution, we discuss the basis of the ultrafast microscopy scheme and the recovery of multi-Terahertz signals from fluorescence data. We elaborate fundamental aspects of time-domain sampling of electric waveforms and different strategies to recover response functions of systems under investigation.
[1] M.B. Heindl, et al., “Ultrafast imaging of terahertz electric waveforms using quantum dots”, Light: Science & Applications 11, 2022.
In this contribution, we present a novel type of sub-cycle field-resolved microscopy of Terahertz electric near-fields inside micro- and nanostructures. The “Quantum-probe Field Microscopy” (QFIM) scheme is based on fluorescence microscopy of semiconductor Quantum-dot luminescence and harnesses the Quantum-confined Stark effect for recording stroboscopic “movies” of ultrafast resonant and propagating THz-excitations. The scheme is compatible with strong local driving field strengths, sub-micrometer resolution and sub-cycle sampling of multi-THz waveforms. We discuss experimental implementations, recent results and future prospects of this versatile microscopy scheme.
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