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Titolo:
OPTICAL-PROPERTIES OF ND3-CRYSTAL SRAL12O19( IN SINGLE)
Autore:
VERDUN HR; WORTMAN DE; MORRISON CA; BRADSHAW JL;
Indirizzi:
FIBERTEK INC,510 HERNDON PKWY HERNDON VA 22070 USA,RES LAB ADELPHI MD 20783
Titolo Testata:
Optical materials
fascicolo: 3, volume: 7, anno: 1997,
pagine: 117 - 128
SICI:
0925-3467(1997)7:3<117:OONSIS>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
LASER MATERIALS; LMA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
27
Recensione:
Indirizzi per estratti:
Citazione:
H.R. Verdun et al., "OPTICAL-PROPERTIES OF ND3-CRYSTAL SRAL12O19( IN SINGLE)", Optical materials, 7(3), 1997, pp. 117-128

Abstract

The spectroscopic characteristics of triply ionized neodymium in Sr1-xNdxAl12-xMgxO19 for x = 0.03 and 0.15 are presented; one Mg2+ ion perNd3+ is required for charge compensation. Crystals of this composition are optically uniaxial, with absorption and emission depending strongly on polarization. The room-temperature fluorescence lifetime is 430mu s for x = 0.03 and 280 mu s for x = 0.15. The main absorption and emission peaks can be fit by assuming the Nd3+ ion substitutes for Sr2 in a site of D-3h point-group symmetry. A crystal-field Hamiltonian of D-3h symmetry is used to fit the data. A best-fit rms deviation of 4.2 cm(-1) is obtained between 32 experimental and theoretical energy levels for the 13 lowest J-multiplets of the 4f(3) electronic configuration of Nd3+ with the following crystal field parameters: B-20 = -202.8 cm(-1), B-40 = 632.7 cm(-1), B-60 = -1752 cm(-1), and B-66 = -1180 cm(-1). The stimulated emission in the F-4(3/2) --> I-4(9/2), F-4(3/2)--> I-4(11/2), and F-4(3/2) --> I-4(13/2) channels peaks at 902, 1049.7, and 1306.5 nm, respectively, and in all cases it is sigma-polarized. The respective spectroscopically determined stimulated emission cross sections for these wavelengths are 3.7 x 10(-20), 1.1 x 10(-19), and 2.6 x 10(-20) cm(2). The best absorption band for diode-laser pumping is centered at 798 nm, with an absorption coefficient of 14 cm(-1) for x = 0.15 and a full-width at half-maximum of 2.5 nm.

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Documento generato il 01/12/20 alle ore 08:20:05