Freiburg 2024 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 36: Quantum Metrology and Interference
Q 36.6: Vortrag
Mittwoch, 13. März 2024, 15:45–16:00, HS 3219
Microcombs for Digital Holography — •Stephan Amann1, Edoardo Vicentini2, Bingxin Xu1, Yang He3, Theodor W. Hänsch1, Qiang Lin3, Kerry Vahala4, and Nathalie Picqué1,5 — 1Max Planck Institute of Quantum Optics, Garching, Germany — 2CIC nanoGUNE BRTA, Donostia-San Sebastian, Spain — 3Department of Electrical and Computer Engineering, University of Rochester, Rochester, New York, USA — 4T.J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, California, USA — 5Max-Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Berlin, Germany
Digital holography is a versatile lensless three-dimensional imaging technique that allows access to the amplitude and phase information of microscopic samples with interferometric precision. We report on microcombs, broad optical spectra consisting of phase-coherent narrow lines which are generated in a high-Q optical microresonator, as novel sources for digital holography. We generate a microcomb of 100 GHz line spacing in a lithium niobate microresonator by pulsed-pumping, which facilitates the reliable control of the line spacing. The combined information of all lines allows to increase the unambiguous axial range of the object reconstruction from less than a micrometer to 1.5 millimeter. Due to their broad spectral bandwidth and large line spacing on the order of hundreds of GHz, microcombs enable the precise imaging of millimeter-sized objects at fast measurement times. Envisioned applications range from nanometer-precision surface profilometry to hyperspectral microparticle analysis.
Keywords: Frequency comb; Digital holography; Three-dimensional imaging; Integrated photonics; Interferometry