Spectroscopy of BeAl2O4:Cr3+ with application to high-temperature sensing

Devin Pugh-Thomas; Brian M. Walsh; Mool C. Gupta

doi:10.1364/AO.49.002891

Applied Optics
Vol. 49,
Issue 15,
pp. 2891-2897
(2010)
•https://doi.org/10.1364/AO.49.002891

Spectroscopy of $Be {Al}_{2} O_{4} : {Cr}^{3 +}$ with application to high-temperature sensing

Devin Pugh-Thomas, Brian M. Walsh, and Mool C. Gupta

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Devin Pugh-Thomas, Brian M. Walsh, and Mool C. Gupta, "Spectroscopy of BeAl₂O₄:Cr³⁺ with application to high-temperature sensing," Appl. Opt. 49, 2891-2897 (2010)

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Abstract

Characterization of absorption, emission, and temperature-dependent luminescent features is of signi ficant interest for the development of optical temperature sensors and photonic devices. In this work, we conduct a comprehensive study to evaluate the orientation axis-dependent absorption and emission cross sections of ${Cr}^{3 +}$ ions in $Be {Al}_{2} O_{4}$ . In addition, we present new data for the temperature-dependent Stark-level energies for alexandrite. Laser-induced temperature-dependent luminescence data from $300 - 520 K$ on the R-line transitions are presented for application to high-temperature sensing.

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Transition	This Study	Walling et al. [7]^a	Northrop [12]	Watanabe et al. [13]
$E ‖ a$
${}^{2}{A_{2}} \to {}^{4}{T_{1}}$	2.6	1.9	─	3.5
${}^{2}{A_{2}} \to {}^{4}{T_{2}}$	0.39	0.32	─	0.4
$E ‖ b$
${}^{2}{A_{2}} \to {}^{4}{T_{1}}$	1.04	0.77	1.05	1.25
${}^{2}{A_{2}} \to {}^{4}{T_{2}}$	1.9	1.4	1.78	2.15
$E ‖ c$
${}^{2}{A_{2}} \to {}^{4}{T_{1}}$	1.35	1.27	─	2.2
${}^{2}{A_{2}} \to {}^{4}{T_{2}}$	0.9	0.68	─	1.2

Multiplet	Degeneracy	Transition	$300 K$	$350 K$	$400 K$	$450 K$	$500 K$
${}^{2}E$	2	$R_{1}$	14,695	14,687	14678	14668	14659
${}^{2}E$	2	$R_{2}$	14,734	14,726	14719	14710	14702
${}^{2}{T_{1}}$	2	$T_{1}$	15,506	15,497	15486	15477	15472
	2	$T_{2}$	15,273	15,266	15259	15248	15245
	2	$T_{3}$	15,076	15,076	15076	15053	15048

Transition	This Study	Walling et al. [7]^a	Northrop [12]	Watanabe et al. [13]
$E ‖ a$
${}^{2}{A_{2}} \to {}^{4}{T_{1}}$	2.6	1.9	─	3.5
${}^{2}{A_{2}} \to {}^{4}{T_{2}}$	0.39	0.32	─	0.4
$E ‖ b$
${}^{2}{A_{2}} \to {}^{4}{T_{1}}$	1.04	0.77	1.05	1.25
${}^{2}{A_{2}} \to {}^{4}{T_{2}}$	1.9	1.4	1.78	2.15
$E ‖ c$
${}^{2}{A_{2}} \to {}^{4}{T_{1}}$	1.35	1.27	─	2.2
${}^{2}{A_{2}} \to {}^{4}{T_{2}}$	0.9	0.68	─	1.2

Multiplet	Degeneracy	Transition	$300 K$	$350 K$	$400 K$	$450 K$	$500 K$
${}^{2}E$	2	$R_{1}$	14,695	14,687	14678	14668	14659
${}^{2}E$	2	$R_{2}$	14,734	14,726	14719	14710	14702
${}^{2}{T_{1}}$	2	$T_{1}$	15,506	15,497	15486	15477	15472
	2	$T_{2}$	15,273	15,266	15259	15248	15245
	2	$T_{3}$	15,076	15,076	15076	15053	15048

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Equations (5)

Applied Optics