Optical properties of color centers in calcium-stabilized gadolinium gallium garnets

Pogatshnik, G. J.; Cain, L. S.; Chen, Y; Evans, BD

doi:10.1103/physrevb.43.1787

Cited by 19 publications

(14 citation statements)

References 12 publications

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“…In order to stabilize the growth of boules of large diameter, some calcium is added to the melt, causing an undesirable coloration that has been attributed to the generation of color centers in a similar garnet. 7 Adding cerium suppresses this coloration. The effect is believed to be due to charge compensation.…”

Section: Methodsmentioning

confidence: 99%

Photochromism of doped terbium gallium garnet

et al. 2006

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In order to understand the photochromic effect in terbium gallium garnet doubly doped with calcium and cerium, the spectral characteristics of absorption changes induced by heating and irradiation are studied. Based on the findings we conclude that the photochromic band at 420 nm originates from defects involving Tb 4+. Previously the band was attributed to Ce 3+. Two possible models are suggested and discussed, both of which are in agreement with the obtained experimental results.

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Section: Methodsmentioning

confidence: 99%

Photochromism of doped terbium gallium garnet

et al. 2006

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“…This occurrence is due the fact that the small amount of calcium ions added in the melt to assist in the crystal growth of GGG crystals creates color centers that absorb in the near UV region of the spectrum. 18 The crystalline field in these systems is such that the difference in energy between the 2 E level and the 4 T 2 level of Cr 3+ is ∼1000 cm −1 in YAG, ∼380 cm −1 in GGG, ∼50 cm −1 in GSGG, and 40 cm −1 in CYMGG. 5,15,19,20 B. YAG:Cr.…”

Section: Garnet Crystals Doped With Chromiummentioning

confidence: 98%

“…We note the particular aspect of the absorption spectrum of GGG:Cr in which the absorption background raises in intensity going from 900 to 400 nm. This occurrence is due the fact that the small amount of calcium ions added in the melt to assist in the crystal growth of GGG crystals creates color centers that absorb in the near UV region of the spectrum …”

Section: Garnet Crystals Doped With Chromiummentioning

confidence: 99%

Site-Selective Spectroscopy of Garnet Crystals Doped with Chromium Ions

et al. 2012

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Site-selective spectroscopy is a tool that can be used to uncover the presence of multiple sites available to optically active ions in host lattices. In this Article, we present techniques that can be applied to appraise the different sites that may occur in systems where charge compensation is required or in systems where such compensation is not present. We then consider some garnet crystals doped with chromium ions. For the Cr-doped garnets (YAG, GGG, GSGG, and CYMGG), we present luminescence and lifetime data over a wide temperature range, and infer not only the presence of different centers, but also the interaction among them as a function of temperature.

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“…Boron-oxygen groups were identified by vibrational spectroscopy [44]. Classical defects such as oxygen vacancies or trapped hole centres do not appear to give absorption bands at k > 350 nm [45]. Platinum impurities from the crucible [23,46] cannot cause the blue colour since undoped garnets are colorless.…”

Section: Discussionmentioning

confidence: 99%