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Journal of Physics Condensed Matter

Stimulated optical pumping in a Tm3+:YAG crystal

Guillaume Gorju, Anne Louchet-Chauvet, David Pabœuf, Fabien Bretenaker, Fabienne Goldfarb, T. Chanelière, I. Lorgeré, J.-L. Le Gouët, O. Guillot-Noël, Philippe Goldner

Published Sep 4, 2007• 6 citations
Publisher

Abstract

The possibility of using stimulated emission to improve the optical pumping of Tm3+ ions embedded in Tm3+:YAG to the 3F4 level is explored. The oscillator strengths and the frequencies of the transitions between the ground crystal field level of 3H4 to the different crystal field levels of 3F4 are measured at low temperature. Stimulated emission measurements at 1461 nm are performed to evaluate the optical pumping efficiency. Application to the spectral tailoring of Tm3+:YAG for quantum information applications is discussed.

DOI
10.1088/0953-8984/19/38/386226

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The possibility of using stimulated emission to improve the optical pumping of Tm3+ ions embedded in Tm3+:YAG to the 3F4 level is explored. The oscillator strengths and the frequencies of the transitions between the ground crystal field level of 3H4 to the different crystal field levels of 3F4 are measured at low temperature. Stimulated emission measurements at 1461 nm are performed to evaluate the optical pumping efficiency. Application to the spectral tailoring of Tm3+:YAG for quantum information applications is discussed.
High resolution, absolute excited-state absorption (ESA) spectra, at room temperature, from the long-lived 3F4 energy level of several crystals doped with trivalent thulium (Tm3+) ions have been measured employing high-brightness narrowband (FWHM <30 nm) light emitting diodes (LEDs) as a probe wavelength. The aim of this investigation was to determine the strength of ESA channels at wavelengths addressable by commercially available semiconductor laser diodes operating around 630-680 nm. The favourable lifetime of the 3F4 manifold and negligible ground-state absorption (GSA) for the red-wavelength second-step excitation, ensures a direct and efficient route for a dual-wavelength pumping scheme of the thulium ion, which will enable blue-green laser emission from its 1G4 upper-laser level.
We report on the experimental demonstration of stimulated Raman adiabatic passage in a Tm3+:YAG{\text{Tm}}^{3+}:\text{YAG}Tm3+:YAG crystal. Tm3+:YAG{\text{Tm}}^{3+}:\text{YAG}Tm3+:YAG is a promising material for use in quantum information processing applications, but as yet there are few experimental investigations of coherent Raman processes in this material. We investigate the effect of inhomogeneous broadening and Rabi frequency on the transfer efficiency and the width of the two-photon spectrum. Simulations of the complete Tm3+:YAG{\text{Tm}}^{3+}:\text{YAG}Tm3+:YAG system are presented along with the corresponding experimental results.
New ways are proposed of increasing broadband-lamp pumping effectiveness of laser crystals with trivalent lanthanides. The method is based on the broadening of lasing-ion absorption spectrum by the remove (excitation) of their considerable part from the ground state into one (some) of the upper states with the help of additional resonant bleaching laser add-pumping Advantages of the new pumping schemes are illustrated by the results, obtained during quantitative analysis of the necessary conditions of stimulated-emission excitation for four laser crystals (LaF3, LiYF4, BaY2F8, and YA103) with Pr3+ ions, which can lase at 3Po → 3F4,3,2, 3H6,5 channels at 300 K with lamp pumping. The method proposed is also suitable for laser effectiveness increase in crystals with other lanthanides activators.