Control of optical properties of YAG crystals by thermal annealing

Tkachenko, S.; Arhipov, P.; Gerasymov, Iaroslav; Kurtsev, D.; Vasyukov, Sergey; Nesterkina, V.; Shiran, N.; Mateichenko, P. V.; Sidletskiy, O.

doi:10.1016/j.jcrysgro.2017.12.002

Cited by 20 publications

(16 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The as‐grown crystals are colored, while the annealed crystals are highly transparent both in UV‐ and in the visible. In annealed YAG:C the color centers are not re‐formed under any subsequent reducing or oxidizing annealing (see Tkachenko et al for details). The irreversible bleaching was observed for YAG:C crystals grown in W, Mo, and Ir crucibles (if raw material was prepared under Ar+CO atmosphere).…”

Section: Resultsmentioning

confidence: 99%

“…This means that the possible introduction of crucible material atoms in the crystals is not responsible for this phenomenon. The lack of coloration after subsequent annealing was attributed to the existence of competing centers of electron capture linked to complex C‐related defects. Thus, a high transparency of annealed YAG:C crystals and their scintillation parameters sustain under any further annealing.…”

Section: Resultsmentioning

confidence: 99%

“…Procedures for aluminum garnets and perovskites growth in Mo and W crucibles have been developed since 1970–80s until much more recently . Meanwhile, a new procedure of growth and post‐growth heat‐treatment for garnet‐based crystals was developed by some of authors of this work, and a series of undoped and Ce‐doped YAG crystals were produced. Among the basic features of the novel procedure there is the use of cheap graphite heat insulation in crystallizer and reducing Ar+CO growth atmosphere.…”

Section: Introductionmentioning

confidence: 99%

“…The latter is a cause of few hundreds wt. ppm (up to 1 at%) carbon incorporation in crystals . As carbon impacts on YAG optical properties, the crystals obtained in these conditions were denoted as carbon‐doped crystals (YAG:C and YAG:Ce,C).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Drastic Scintillation Yield Enhancement of YAG:Ce with Carbon Doping

Sidletskiy

Arhipov

Tkachenko

et al. 2018

Physica Status Solidi (a)

View full text Add to dashboard Cite

Scintillation performances of carbon‐doped YAG and YAG:Ce crystals obtained by the Czochralski method under novel conditions of Ar+CO reducing atmosphere is compared to their counterparts obtained by conventional technologies. While light yield and energy resolution in YAG crystals grown under different conditions is similar, a fast luminescence decay component of 4–6 ns is observed in YAG:C grown by the new procedure. Optimization of post‐growth thermal annealing procedure of YAG:Ce,C scintillator provides the very high light yield of 28 200 phot MeV−1, and the energy resolution of 7.8–8.5% at 662 KeV

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Drastic Scintillation Yield Enhancement of YAG:Ce with Carbon Doping

Sidletskiy

Arhipov

Tkachenko

et al. 2018

Physica Status Solidi (a)

View full text Add to dashboard Cite

show abstract

“…It is worth to note that the yttrium aluminum garnet (YAG) has been a good choice because of its high melting point, interesting mechanical properties, good high-temperature chemical stability, and what's more, a low high-temperature creep rate (lowest of all known oxides 2.5 × 10 −9 /s at 1700°C, 100 MPa) [12][13][14][15][16][17][18]. YAG was in situ synthesized in the spinel refractory matrix by using a fused spinel as the raw material and an Y 2 O 3 micropowder as the additive in this work.…”

Section: Introductionmentioning

confidence: 99%

Effect of Y2O3 doping on the high-temperature properties of magnesia aluminate spinel refractories

Liu

Wang

et al. 2019

J Aust Ceram Soc

View full text Add to dashboard Cite

A series of low-creep magnesium aluminate spinel refractories doped with 0-3 wt% Y 2 O 3 were prepared by sintering at 1750°C. The physical properties, especially the high-temperature properties of the refractories, were investigated. X-ray diffractometry (XRD) and scanning electron microscopy (SEM) were applied to characterize the phases and microstructure of the refractories. The results indicated that yttrium aluminum garnet (YAG) could be in situ formed with the addition of Y 2 O 3 in the spinel refractories. This stabilized the grain boundary of the spinel. The mechanical properties and high-temperature creep resistance of the spinel refractory could significantly be improved by the addition of Y 2 O 3 .

show abstract

Fabrication and Characterization of High‐Dimension Single‐Crystal Yb:YAG Ingots Grown by Horizontal Directed Crystallization Method

Kajan

Volkov

Damazyan³

et al. 2020

Crystal Research and Technology

View full text Add to dashboard Cite

The research conducted herein builds upon the achievement of a successful and stable 170 × 300 × 35 mm YAG and 5% Yb:YAG single‐crystals production via the horizontal directed crystallization method. Based on the analysis of residual birefringence pattern in analyzed ingots, a hypothesis is proposed—debating that in certain stages of the growth, {211} facets start to form within some sections of the crystallization front. The sensitivity of the {211} facets to temperature fluctuations seems to cause striations in the facets’ growth sectors. In a later stage of the growth process the slope of the crystallization front naturally changes, which seems to reduce the formation of facets considerably. As a result, the rear part of the crystal achieves the best optical quality. The samples extracted from that portion of the ingot, after annealing, possess good optical quality and heat release of 0.004 1/m at 1070 nm, which is quite low, and is considered a good result for the garnet family of crystals. The lasing experiment with thin‐disk geometry shows a slope efficiency of 52% and proves that the material is suitable for high‐power lasers application.

show abstract

Control of optical properties of YAG crystals by thermal annealing

Cited by 20 publications

References 13 publications

Drastic Scintillation Yield Enhancement of YAG:Ce with Carbon Doping

Drastic Scintillation Yield Enhancement of YAG:Ce with Carbon Doping

Effect of Y2O3 doping on the high-temperature properties of magnesia aluminate spinel refractories

Fabrication and Characterization of High‐Dimension Single‐Crystal Yb:YAG Ingots Grown by Horizontal Directed Crystallization Method

Contact Info

Product

Resources

About