Degenerate mirrorless lasing in thermal alkali vapors

• URL: http://arxiv.org/abs/2503.14705v1
• Date: Tue, 18 Mar 2025 20:09:43 GMT
• Title: Degenerate mirrorless lasing in thermal alkali vapors
• Authors: Aneesh Ramaswamy, Svetlana A. Malinovskaya,
• Abstract summary: A degenerate two-level alkali atom system was driven by a linearly polarized continuous-wave pump field.<n>A sub-natural linewidth dispersive structure was observed near the pump resonance.<n>A distinct pure gain peak appeared at a sideband corresponding to a dressed-state transition.<n>Our results can enable degenerate lasing in thermal alkali atom vapors, offering a significant enhancement in the signal-to-noise ratio for fluoroscopic remote magnetic sensing applications.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: For a degenerate two-level alkali atom system driven by a linearly polarized continuous-wave pump field, the steady-state gain for an orthogonally polarized probe field was theoretically predicted (Ramaswamy et al., Mirrorless Lasing: A Theoretical Perspective. Opt. Memory and Neural Networks 32, S443-S466 (2023)). Using linear response theory, we calculated the probe absorption spectrum when the pump was detuned from resonance. A sub-natural linewidth dispersive structure was observed near the pump resonance, exhibiting both gain and absorption. Additionally, a distinct pure gain peak appeared at a sideband corresponding to a dressed-state transition. These effects typically do not persist outside the ultracold regime due to inhomogeneous broadening caused by Doppler broadening, which washes out the fine spectral details. We demonstrate that the sideband gain peak is sustained in the warm vapor regime when both the pump Rabi frequency and detuning exceed the Doppler width. Our results can enable degenerate mirrorless lasing in thermal alkali atom vapors, offering a significant enhancement in the signal-to-noise ratio for fluoroscopic remote magnetic sensing applications.

Related papers

• Nanoscale Mirrorless Superradiant Lasing [0.0]
  We predict collective 'free-space' lasing in a dense nanoscopic emitter arrangement.<n>We show that this leads to superradiant lasing near the bare atomic frequency.
  arXiv  Detail & Related papers  (2025-05-06T23:53:04Z)
• Doppler-assisted quantum resonances through swappable excitation pathways in Potassium vapor [0.0]
  We report the observation of two additional sub-natural line width quantum interference in the $D$ manifold of $39K$ vapor. The other two features appear exclusively because $39K$ ground hyperfine splitting is smaller than the Doppler broadened absorption profile.
  arXiv  Detail & Related papers  (2024-03-27T07:45:04Z)
• Nonlinear spectroscopy of semiconductor moiré materials [0.0]
  We use time-resolved nonlinear pump--probe measurements to reveal features of semiconductor moir'e materials. We generate a high density of virtual excitons or exciton--polarons in various moir'e minibands.
  arXiv  Detail & Related papers  (2024-02-26T15:02:51Z)
• Latched Detection of Zeptojoule Spin Echoes with a Kinetic Inductance Parametric Oscillator [0.0]
  We operate a detector based on a superconducting microwave resonator. The device indicates the absorption of low-power microwave wavepackets by transitioning to a self-oscillating state. We achieve a latched-readout of the spin signal with an amplitude that is five hundred times greater than the underlying spin echoes.
  arXiv  Detail & Related papers  (2023-11-07T03:55:15Z)
• Resolving Fock states near the Kerr-free point of a superconducting resonator [51.03394077656548]
  We have designed a tunable nonlinear resonator terminated by a SNAIL (Superconducting Asymmetric Inductive eLement) We have excited photons near this Kerr-free point and characterized the device using a transmon qubit.
  arXiv  Detail & Related papers  (2022-10-18T09:55:58Z)
• Quantum-enhanced absorption spectroscopy with bright squeezed frequency combs [91.3755431537592]
  We propose a strategy combining the advantages of frequency modulation spectroscopy with the reduced noise properties accessible by squeezing the probe state. A homodyne detection scheme allows the simultaneous measurement of the absorption at multiple frequencies. We predict a significant enhancement of the signal-to-noise ratio that scales exponentially with the squeezing factor.
  arXiv  Detail & Related papers  (2022-09-30T17:57:05Z)
• Dynamics of Transmon Ionization [94.70553167084388]
  We numerically explore the dynamics of a driven transmon-resonator system under strong and nearly resonant measurement drives. We find clear signatures of transmon ionization where the qubit escapes out of its cosine potential.
  arXiv  Detail & Related papers  (2022-03-21T18:00:15Z)
• Resonant scattering of a single atom with gain: a wavefunction-diagrammatic approach [0.0]
  We characterize the optical response of a three-level atom subjected to an incoherent pump. For sufficiently strong pump, gains and losses compensate, resulting in the vanishing of extinction.
  arXiv  Detail & Related papers  (2021-06-30T15:51:35Z)
• Quantum Borrmann effect for dissipation-immune photon-photon correlations [137.6408511310322]
  We study theoretically the second-order correlation function $g(2)(t)$ for photons transmitted through a periodic Bragg-spaced array of superconducting qubits, coupled to a waveguide. We demonstrate that photon bunching and anti-bunching persist much longer than both radiative and non-radiative lifetimes of a single qubit.
  arXiv  Detail & Related papers  (2020-09-29T14:37:04Z)
• Collective radiation from distant emitters [63.391402501241195]
  We show that the spectrum of the radiated field exhibits non-Markovian features such as linewidth broadening beyond standard superradiance. We discuss a proof-of-concept implementation of our results in a superconducting circuit platform.
  arXiv  Detail & Related papers  (2020-06-22T19:03:52Z)
• The Origin of Antibunching in Resonance Fluorescence [0.0]
  Epitaxial quantum dots have emerged as one of the best single-photon sources. One intriguing observation is the scattering of photons with subnatural linewidth from a two-level system. Here, we demonstrate that this simultaneous observation of subnatural linewidth and antibunching is not possible with simple resonant excitation.
  arXiv  Detail & Related papers  (2020-05-24T16:48:33Z)
• Optical Magnetometer: Quantum Resonances at pumping repetition rate of 1/n of the Larmor frequency [58.720142291102135]
  Quantum sub-resonances at a repetition rate of $1/n$ of the Larmor frequency of the magnetic field inside the shield are experimentally observed and theoretically explained. Investigations in single alkali atoms cells as well as mixed alkali atoms of K and Rb are presented.
  arXiv  Detail & Related papers  (2020-02-20T09:14:56Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.