Terahertz Phonons coherently couple Ultrashort Solitons inside a Cavity
Alexandra Voelkel, Georg Herink

TL;DR
This paper demonstrates the coherent coupling of Terahertz phonons with optical solitons inside a laser cavity, enabling ultrafast control and spectroscopy of atomic vibrations through intra-cavity interactions.
Contribution
It introduces a novel intra-cavity method to excite and sample coherent phonons and solitons, revealing phonon-soliton binding and coupling mechanisms in laser media.
Findings
Terahertz phonons can bind optical solitons into bound states.
Coherent phonon-soliton coupling enhances Raman signals.
Intra-cavity soliton dynamics enable high-speed Raman spectroscopy.
Abstract
Ultrafast atomic vibrations mediate heat transport, serve as fingerprints for chemical bonds and drive phase transitions in condensed matter systems. Light pulses shorter than the atomic oscillation period can not only probe, but even stimulate and control collective excitations. In general, such interactions are performed with free-propagating pulses. Here, we demonstrate intra-cavity excitation and time-domain sampling of coherent optical phonons inside an active laser oscillator. Employing real-time spectral interferometry, we reveal that Terahertz beats of Raman-active optical phonons can bind temporal solitons to bound-states - termed "Soliton molecules" - and we resolve a coherent coupling mechanism of phonon and intra-cavity soliton motion. Concurring electronic and nuclear nonlinearities generate distinct soliton trajectories and, effectively, enhance the coherent Raman signal.…
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Taxonomy
TopicsSpectroscopy and Quantum Chemical Studies · Advanced Fiber Laser Technologies · Mechanical and Optical Resonators
