Mainz 2026 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 41: Poster – Quantum Technologies II & Laser Technology

Q 41.10: Poster

Mittwoch, 4. März 2026, 17:00–19:00, Philo 2. OG

Sub-natural linewidth absorption filter based on Raman resonance in hot atomic vapour — •Viola-Antonella Zeilberger¹, Inna Kviatkovsky¹, Lucas Pache¹, Leonid Yatsenko², Philipp Schneeweiss¹, Jürgen Volz¹, and Arno Rauschenbeutel¹ — ¹Institute of Physics, Humboldt University of Berlin, Berlin, Germany — ²Institute of Physics, National Academy of Sciences of Ukraine, Kyiv, Ukraine

Narrow optical band-stop filters are essential for fundamental research and a wide range of photonic technologies, including quantum memory and low-frequency Raman spectroscopy. Experimentally, narrow absorption features are realised using optical resonators or Faraday filters. In this work, we present an experimental realisation of a sub-natural linewidth filter based on Raman resonance in hot ⁸⁷Rb vapour. The filter builds on a three-level lambda scheme on the D1 line, where two optical fields couple the hyperfine ground states to a common excited state. By driving Raman transitions at single-photon detunings larger than the Doppler width of the atomic vapour, we are able to obtain absorption features in the kilohertz regime, well below the natural linewidth. We further investigate the influence of buffer gas and the addition of a repump field for achieving higher optical depth. This implementation of an optical notch-filter combines the advantages of a spectral narrow-band absorption window with high off-resonant transmission and thus can be crucial for applications where narrow spectral features have to be attenuated without affecting the rest of the spectrum.

Keywords: Hot Rubidium vapour; Raman resonance; Narrow band-pass filter