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Applied Optics

Applied Optics


  • Vol. 38, Iss. 12 — Apr. 20, 1999
  • pp: 2714–2723

Upconversion and reduced 4F3/2 upper-state lifetime in intensely pumped Nd:YLF

Jonathan D. Zuegel and Wolf Seka  »View Author Affiliations

Applied Optics, Vol. 38, Issue 12, pp. 2714-2723 (1999)

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Nonexponential decay of the 4F3/2 upper laser state in Nd:YLF was observed with time-resolved fluorescence spectroscopy and small-signal gain probes in low-doped (1.16-at. %) samples when intensely pumped to high population inversions. A rapid initial decay is observed after Q-switched laser pumping, followed by a longer nonexponential decay that is clearly identified as a phase of migration-assisted energy-transfer upconversion (ETU) in the hopping regime. During this phase, a rate-equation treatment is valid and the macroscopic ETU coefficient, α2 = (0.98 ± 0.03) × 10-16 cm3/s, is directly evaluated from the decay kinetics. The ETU and the migration microparameters are also estimated to be C da * ≈ 200 × 10-40 cm6/s and C dd ≈ 1000 × 10-40 cm6/s, respectively, and are compared with theoretical values found in the literature. On the basis of these values, rate-equation treatments of intensely pumped Nd:YLF are not strictly valid.

© 1999 Optical Society of America

OCIS Codes
(140.3530) Lasers and laser optics : Lasers, neodymium
(140.3580) Lasers and laser optics : Lasers, solid-state
(190.7220) Nonlinear optics : Upconversion
(260.3800) Physical optics : Luminescence
(300.6500) Spectroscopy : Spectroscopy, time-resolved

Original Manuscript: May 5, 1998
Revised Manuscript: February 8, 1999
Published: April 20, 1999

Jonathan D. Zuegel and Wolf Seka, "Upconversion and reduced 4F3/2 upper-state lifetime in intensely pumped Nd:YLF," Appl. Opt. 38, 2714-2723 (1999)

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