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Q: Fachverband Quantenoptik und Photonik
Q 5: Collective Effects and Disordered Systems
Q 5.1: Talk
Monday, March 10, 2025, 11:00–11:15, HS I PI
Non-Linear Maser Oscillations at Room Temperature — •Christoph W. Zollitsch1,2, Christopher W. M. Kay1,3, and Jonathan D. Breeze2 — 1Department of Chemistry, Saarland University, Saarbrücken, Germany — 2Department of Physics & Astronomy, University College London, London, UK — 3London Centre for Nanotechnology, University College London, London, UK
The recent realization of a continuous-wave room temperature maser, using NV− centers in diamond pumped by a 532 nm laser, is a promising platform for novel research and development in areas of signal amplification, timekeeping and sensing. Typically, for such applications a maser oscillator is operated in linear response regime. For masing, the NV− spin ensemble is pumped into a non-equilibrium state and, for strong enough pump rates, can also be driven into a non-linear regime. Maser oscillation changes dramatically, exhibiting a frequency-comb like spectrum, instead of a single narrow frequency mode. Studying nonlinear behavior in room temperature solid-state masers can lead to new pathways of quantum sensing.
We present an NV− center maser system and experimentally characterize the transition from linear to non-linear maser oscillation, via frequency and time domain analysis. A feature for non-linear behavior is bifurcation. Here, the inhomogeneous broadened spin distribution experiences bifurcation. The dynamics can be modelled numerically through a quantum master equation with Lindbladian dissipators and is in excellent agreement with experimental data. We discuss individual features of non-linear dynamics and their potential applications.
Keywords: Maser; Collective Light-Matter Effects; NV-Centers; Non-Linear Dynamics