The Anisotropic Thermal Expansion of Non-linear Optical Crystal BaAlBO3 F2 Below Room Temperature

Frontiers in Chemistry
Xingxing JiangZheshuai Lin

Abstract

Thermal expansion is a crucial factor for the performance of laser devices, since the induced thermal stress by laser irradiation would strongly affect the optical beam quality. For BaAlBO3F2 (BABF), a good non-linear optical (NLO) crystal, due to the highly anisotropic thermal expansion its practical applications are strongly affected by the "tearing" stress with the presence of local overheating area around the laser spot. Recently, the strategy to place the optical crystals in low-temperature environment to alleviate the influence of the thermal effect has been proposed. In order to understand the prospect of BABF for this application, in this work, we investigated its thermal expansion behavior below room temperature. The variable-temperature XRD showed that the ratio of thermal expansion coefficient between along c- and along a(b)- axis is high as 4.5:1 in BABF. The Raman spectrum combined with first-principles phonon analysis revealed that this high thermal expansion anisotropy mainly ascribe to progressive stimulation of the respective vibration phonon modes related with the thermal expansion along a(b)- and c-axis. The good NLO performance in BABF can be kept below room temperature. The work presented in this paper prov...Continue Reading

References

Nov 15, 1992·Physical Review. B, Condensed Matter·J P Perdew, Y Wang
Oct 28, 1996·Physical Review Letters·J P PerdewM Ernzerhof
Feb 20, 2009·Nature·David Cyranoski
Jul 15, 2016·Optics Express·Samuel MarrazzoJean-Christophe Chanteloup

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Methods Mentioned

BETA
thermal expansion
X-ray

Software Mentioned

TOPAS
CASTEP
PASCal

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