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Journal of Applied Spectroscopy

Polarizational dependences of a two-photon absorption in a7F0 →5D0 channel for Sm2+ in BaClF

A. G. Makhanek, V. S. Korol'kov

Published Sep 1, 1992• 0 citations
Publisher
DOI
10.1007/bf00661481

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A new mechanism of spectral holeburning by 2-step photoionization ("photon-gated" holeburning) has recently been demonstrated. In BaClF : Sm2+, this leads to permanent spectral holes 25 MHz wide which we have used to measure small linear Stark and nonlinear Zeeman coefficients of the 7F0↔5D0 transition of Sm2+. The Zeeman coefficients agree within 4% with those calculated assuming free ion 4f6 wave functions for 7F0 and 5D0.

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Spectral hole burning in solids is a selective bleaching of a small portion of an inhomogeneously broadened optical transition by a laser. In the photon gated holeburning process spectral holes are burned in two steps. The first is provided by a narrow band laser resonant with the inhomogeneously broadened transition and the second (gating) can be initiated by a broad band light source. Photon gated spectral hole burning was reported recently in 7F0→5D0 and 7F0→5D1 absorption lines of Sm2+ in BaClF(1). In this poster we report on the spectral holeburning behaviour of 1F0→5D2 transition. We found that even in absence of additional light source for gating, permanent holes can be burned. This self gating behaviour is consistent with the observation that the optimum frequency following 5D0 excitation is ≈ 22 000cm-1 so that two photons of energy 5D2 - 7F0 are sufficient to produce photoionisation. We have analysed the light intensity dependance of hole area and a simple model indicate that the electron transfer following the photoionisation is strongly dependant on the ion - electron trap distance.

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PHOTON GATED HOLEBURNING BY 2-STEP PHOTOIONIZATION

Albrecht Winnacker, Robert M. Shelby, R. M. Macfarlane

We report the observation of photon-gated spectral holeburning in which persistent holes are burned in an inhomogeneoulsy broadened absorption line only in the presence of a second gating light source. The measurements were made in BaClF : Sm2+ and involve 2-step photoionization of Sm2+. A remarkable and novel feature of this System is that holes can be recovered after temperature cycling to 300 K for several days.

Le Journal de Physique Colloques•Oct 1, 1985•3 citations
Spectral hole burning in solids is a selective bleaching of a small portion of an inhomogeneously broadened optical transition by a laser. In the photon gated holeburning process spectral holes are burned in two steps. The first is provided by a narrow band laser resonant with the inhomogeneously broadened transition and the second (gating) can be initiated by a broad band light source. Photon gated spectral hole burning was reported recently in 7F0→5D0 and 7F0→5D1 absorption lines of Sm2+ in BaClF(1). In this poster we report on the spectral holeburning behaviour of 1F0→5D2 transition. We found that even in absence of additional light source for gating, permanent holes can be burned. This self gating behaviour is consistent with the observation that the optimum frequency following 5D0 excitation is ≈ 22 000cm-1 so that two photons of energy 5D2 - 7F0 are sufficient to produce photoionisation. We have analysed the light intensity dependance of hole area and a simple model indicate that the electron transfer following the photoionisation is strongly dependant on the ion - electron trap distance.