Journal of Physics Conference Series

Pump-probe studies of absorption saturation and optical gain in Ce:LiCaAlF6 ultraviolet active medium

A I Galiev, Vadim Vladimirovich Semashko, O R Akhtyamov, S. A. Shnaidman, Марисов Михаил Александрович, Alexey S Nizamutdinov, Alexey A. Shavelev

Published Dec 19, 2013• 3 citations

Publisher

Abstract

Aim of this work was to investigate nonlinear absorption of pump radiation in UV spectral range of Ce 3+ :LiCaAlF 6 crystalline active medium. We were able to evaluate excited state absorption cross-section at pump wavelength (266 nm) and recombination probabilities by means of computer simulation.

DOI: 10.1088/1742-6596/478/1/012024

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Publisher

Abstract

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Absorption of continuous wave and pulsed resonance radiation at a wavelength of 1.6 µm at the upward transition from the excited state

^{5}{\mathrm{I}}_{7}

of holmium (Ho3+) ions in silica-based fiber has been studied. Analysis of experimental and simulated data of the absorption dynamics for the case of pulsed pumping of Ho-doped fiber allowed us to determine the previously unknown value of the absorption cross-section at the transition

^{5}{\mathrm{I}}_{7}{ \to }^{5}{\mathrm{I}}_{5}

as 1.9×10–21cm2. It allowed us to correctly simulate the relaxation process of the

^{5}{\mathrm{I}}_{7}

level population averaged over the fiber length in the presence of stationary resonance radiation. The effect of pulsed resonance radiation with different peak powers (10 and 100 W) and pulse duration of 1μs on the stationary active medium was considered. The mutual influence of the Ho-doped fiber characteristics and the resonance radiation at a wavelength of 1.6 μm was found. This allows the resonance radiation to be used as an attenuator or modulator of laser radiation at the

^{5}{\mathrm{I}}_{8}{ \to }^{5}{\mathrm{I}}_{7}

transition in Ho-doped fibers.

The optical transitions in

{\mathrm{Ce}}^{3+}

{\mathrm{Y}}_{3}

{\mathrm{Al}}_{5}

{\mathrm{O}}_{12}

from the lowest 5d excited state of the

{\mathrm{Ce}}^{3+}

ion to the host conduction band have been investigated. Two spatially overlapped and time-sequenced laser pulses were used to observe directly the excited-state absorption (ESA) and the two-step photoionization of the cerium ions. The peak cross section of the ESA transition is (1.0\ifmmode\pm\else\textpm\fi{}0.3)\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}17}$

{\mathrm{cm}}^{2}

at 700 nm. The ESA spectrum was measured from 600 to 880 nm and is used to construct an energy-level diagram for the

{\mathrm{Ce}}^{3+}

ions relative to the energy-band states of the

{\mathrm{Y}}_{3}

{\mathrm{Al}}_{5}

{\mathrm{O}}_{12}

host. The energy gap between the lowest relaxed 5d state and the conduction-band edge is estimated to be 10 000 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$. Strong-probe saturation measurements indicate a slow and inefficient back-transfer of excitation to the cerium ions following the ESA. Photoconductivity measurements were used to confirm the two-step photoionization of the cerium ions.