Photon spin molasses for laser cooling molecular rotation

• URL: http://arxiv.org/abs/2111.03763v1
• Date: Sat, 6 Nov 2021 00:16:36 GMT
• Title: Photon spin molasses for laser cooling molecular rotation
• Authors: W. C. Campbell and B. L. Augenbraun
• Abstract summary: We show that angular momentum transfer from red-detuned Doppler cooling light can also exert a damping torque on linear molecules. This cooling process is derived from photon spin, and indicates that standard optical molasses can also cool molecular rotation with no additional experimental resources.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Laser cooling of translational motion of small molecules is performed by addressing transitions that ensure spontaneous emission cannot cause net rotational excitation. This will not be possible once the rotational splitting becomes comparable to the operational excitation linewidth, as will occur for large molecules or wide bandwidth lasers. We show theoretically that in this regime, angular momentum transfer from red-detuned Doppler cooling light can also exert a damping torque on linear molecules, cooling rotation to the same Doppler limit (typically $\approx$ 500 $\mu$K for molecules with $\approx$ 10 ns excited-state lifetimes). This cooling process is derived from photon spin, and indicates that standard optical molasses can also cool molecular rotation with no additional experimental resources.

Related papers

• Rotational cooling of large trapped molecular ions [0.0]
  We suggest a protocol for the sympathetic cooling of a molecular asymmetric top rotor co-trapped with laser-cooled atomic ions.<n>We demonstrate the efficient depopulation of arbitrary rotational subspaces and the ability to cool an incoherent distribution of rotational states into a single, well-defined quantum state.
  arXiv  Detail & Related papers  (2025-06-25T21:34:40Z)
• Rotational magic conditions for ultracold molecules in the presence of Raman and Rayleigh scattering [0.0]
  We show that efficient trapping of a molecule in its vibrational ground state can be achieved by selecting a laser frequency with a detuning on the order of tens of GHz. We demonstrate that magic trapping conditions for multiple rotational states of the ultracold $23$Na$87$Rb polar molecule can be created.
  arXiv  Detail & Related papers  (2023-10-24T22:09:42Z)
• Dynamics of molecular rotors in bulk superfluid helium [68.8204255655161]
  We report on the experimental study of the laser-induced rotation of helium dimers inside the superfluid $4mathrmHe$ bath at variable temperature. The observed temperature dependence suggests a non-equilibrium evolution of the quantum bath, accompanied by the emission of the wave of second sound.
  arXiv  Detail & Related papers  (2023-04-08T01:22:19Z)
• 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)
• Echo-enhanced molecular orientation at high temperatures [4.239093018686964]
  We propose to use the mechanism of the echo phenomenon previously observed in hadron accelerators, free-electron lasers, and laser-excited molecules. A linearly polarized short laser pulse transforms a broad thermal distribution in the molecular rotational phase space into many separated narrow filaments. The overall enhanced orientation of the molecular gas is achieved with some delay, in the course of the echo process.
  arXiv  Detail & Related papers  (2022-07-17T19:50:08Z)
• Quantum density matrix theory for a laser without adiabatic elimination of the population inversion: transition to lasing in the class-B limit [62.997667081978825]
  No class-B quantum density-matrix model is available to date, capable of accurately describing coherence and photon correlations within a unified theory. Here we carry out a density-matrix theoretical approach for generic class-B lasers, and provide closed equations for the photonic and atomic reduced density matrix in the Fock basis of photons. This model enables the study of few-photon bifurcations and non-classical photon correlations in class-B laser devices, also leveraging quantum descriptions of coherently coupled nanolaser arrays.
  arXiv  Detail & Related papers  (2022-05-26T16:33:51Z)
• High-resolution 'magic'-field spectroscopy on trapped polyatomic molecules [62.997667081978825]
  Rapid progress in cooling and trapping of molecules has enabled first experiments on high resolution spectroscopy of trapped diatomic molecules. Extending this work to polyatomic molecules provides unique opportunities due to more complex geometries and additional internal degrees of freedom.
  arXiv  Detail & Related papers  (2021-10-21T15:46:17Z)
• $\Lambda$-enhanced gray molasses in a tetrahedral laser beam geometry [0.0]
  We report observation of sub-Doppler cooling of lithium using an irregular-tetrahedral laser beam arrangement. We capture 11(2) % of the lithium atoms from a grating magneto-optical trap into gray molasses. Our results show that grating magneto-optical traps can serve as a robust source of cold atoms for tweezer-array and atom-chip experiments.
  arXiv  Detail & Related papers  (2021-10-06T20:52:45Z)
• Excited rotational states of molecules in a superfluid [0.0]
  We explore excited rotational states of molecules embedded in helium nanodroplets. Laser-induced nonadiabatic molecular alignment is employed to measure spectral lines for rotational states. We show that the effect of the surrounding superfluid on molecular rotation can be rationalized by a single quantity.
  arXiv  Detail & Related papers  (2021-06-30T15:59:18Z)
• Cooling of a Zero-Nuclear-Spin Molecular Ion to a Selected Rotational State [0.0]
  We demonstrate rotational cooling of the silicon monoxide cation via optical pumping by a spectrally filtered broadband laser. Compared with diatomic hydrides, SiO+ is more challenging to cool because of its smaller rotational interval. The absence of hyperfine structure in its dominant isotopologue greatly reduces demands for pure quantum state preparation.
  arXiv  Detail & Related papers  (2020-05-13T21:51:10Z)
• Resonant high-energy bremsstrahlung of ultrarelativistic electrons in the field of a nucleus and a pulsed light wave [68.8204255655161]
  Research investigates the resonant high-energy spontaneous bremsstrahlung of ultrarelativistic electrons with considerable energies in the field of a nucleus and a quasimonochromatic laser wave.
  arXiv  Detail & Related papers  (2020-04-05T16:27:11Z)
• Force and acceleration sensing with optically levitated nanogram masses at microkelvin temperatures [57.72546394254112]
  This paper demonstrates cooling of the center-of-mass motion of 10 $mu$m-diameter optically levitated silica spheres to an effective temperature of $50pm22 mu$K. It is shown that under these conditions the spheres remain stably trapped at pressures of $sim 10-7$ mbar with no active cooling for periods longer than a day.
  arXiv  Detail & Related papers  (2020-01-29T16:20:35Z)

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.