Matériaux laser dopés terres rares impulsionnels dans la gamme spectrale 1 um et 1.5 um: efforts sur la montée en puissance et en cadence

Abstract : This work is devoted to the study of diode-pumped rare-earth doped solid-state lasers emitting in the infrared spectral range: at 1 μm for high-power laser and ultra-short pulses and at 1,5 μm in the eye-safe domain. The first part of this work describes the study of two kinds of defects occurring in Yb:CALGO crystals: diffusing centres and colour centres. The non-stoechiometric compositions and the growth parameters we investigated do not eliminate the diffusing centers, whereas a solid solution Ca2+-Sr2+ does but presents another type of defects (bubbles). The colour centres are attributed to polaronic holes, which is confirmed by fitting the related absorption band. The study of codoped materials Yb3+, X4+:CALGO tends to show a positive effect of the tetravalent codopant on the decoloration. The second part studies Er, Yb codoped materials for eye-safe laser applications. After crystal growth of the selected Er, Yb codoped hosts (Ca2Al2SiO7, SrGdGa3O7, Y2SiO5, CaGdAlO4), thermal, spectroscopic and laser properties are evaluated. In CW regime, Er, Yb, Ce: CAS generates output power of 200-300 mW at 1555 nm. In Q-Switch regime, pulses of 1,4 mJ energy and 40 ns-duration are obtained in Er, Yb, Ce:CAS for the first time. Hence this crystal appears as a possible alternative to the commercial phosphate glass.
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https://pastel.archives-ouvertes.fr/pastel-00973878
Contributor : Anael Jaffres <>
Submitted on : Friday, April 4, 2014 - 4:37:44 PM
Last modification on : Wednesday, February 6, 2019 - 3:31:19 PM
Long-term archiving on : Friday, July 4, 2014 - 1:55:37 PM

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  • HAL Id : pastel-00973878, version 1

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Anael Jaffres. Matériaux laser dopés terres rares impulsionnels dans la gamme spectrale 1 um et 1.5 um: efforts sur la montée en puissance et en cadence. Chimie inorganique. Université Pierre et Marie Curie - Paris VI, 2013. Français. ⟨pastel-00973878⟩

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