Using frequency-narrowed, tunable laser diode arrays with integrated volume holographic gratings for spin-exchange optical pumping at high resonant fluxes and xenon densities

N. Whiting, P. Nikolaou, N. A. Eschmann, M. J. Barlow, R. Lammert, J. Ungar, W. Hu, L. Vaissie, B. M. Goodson

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Next-generation laser diode arrays with integrated 'on-chip' volume holographic gratings can provide high power with spectrally narrowed output that can be tuned about the rubidium D 1 line - without causing significant changes to the laser's flux or spectral profile. These properties were exploited to independently evaluate the effects of varying the laser centroid wavelength and power on batch-mode Rb/ 129Xe spin-exchange optical pumping (SEOP) as functions of xenon partial pressure and cell temperature. Locally optimized SEOP was often achieved with the laser tuned to either the red or blue side of the Rb D 1 line; global optimization of SEOP was observed at lower cell temperatures and followed the D 1 absorption profile, which was asymmetrically broadened and red-shifted from the nominal wavelength. The complex dependence of the optimal wavelength for laser excitation on the cell temperature and Xe density appears to result from an interplay between cell illumination and the Rb/ 129Xe spin-exchange rate, as well as [Xe] cell-dependent changes to the Rb absorption lineshape that are in qualitative agreement with expectations based on previous work [Romalis et al., Phys. Rev. A, 56:4569-4578, (1997)], but significantly greater in magnitude. These next-generation lasers provide a ∼2-3-fold improvement in 129Xe polarization compared to conventional broadband lasers.

Original languageEnglish (US)
Pages (from-to)775-788
Number of pages14
JournalApplied Physics B: Lasers and Optics
Volume106
Issue number4
DOIs
StatePublished - Mar 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

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