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Rapid beam scanning as a consequence of transverse mode-locking (TML) is demonstrated by mode conversion in an empty optical resonator. Phase-locked spectral components of an incident beam are matched to transverse mode resonances of the conversion resonator. This way, a TML beam is generated by simultaneous transmission of all spectral components. This can also be understood as conversion of a longitudinal mode-locked to a transverse mode-locked state, or equivalently, conversion from temporal amplitude modulation to spatial beam scanning. The Pound-Drever-Hall (PDH) scheme is used to stabilize the incident beam's optical frequencies to a compound transverse mode resonance, showing that continuous emission of a well-defined transverse mode-locked state is possible.
Michael Zwilich,Florian Schepers, andCarsten Fallnich
"Rapid spatio-temporal beam oscillation by transverse mode-locking in an empty Pound-Drever-Hall stabilized resonator", Proc. SPIE PC12901, Complex Light and Optical Forces XVIII, PC129010L (13 March 2024); https://doi.org/10.1117/12.2692276
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Michael Zwilich, Florian Schepers, Carsten Fallnich, "Rapid spatio-temporal beam oscillation by transverse mode-locking in an empty Pound-Drever-Hall stabilized resonator," Proc. SPIE PC12901, Complex Light and Optical Forces XVIII, PC129010L (13 March 2024); https://doi.org/10.1117/12.2692276