Effective segregation during Czochralski growth and spectral properties of Nd3+ in GSAG crystal

• Published in: Journal of alloys and compounds 2012-01, Vol.512 (1), p.230-234
• Main Authors: Su, J., Liu, B., Xu, L.H., Zhang, Q.L., Yin, S.T.
• Format: Article
• Language: English
• Subjects: Absorption cross sections; Coefficients; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Crystal growth; Crystals; Czochralski process; Exact sciences and technology; Fluorescence; Growth from melts; zone melting and refining; Lasers; Luminescence; Materials science; Mathematical analysis; Methods of crystal growth; physics of crystal growth; Optical constants: refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity; Optical materials; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of bulk materials and thin films; Optical spectroscopy; Other solid inorganic materials; Photoluminescence; Physics; Segregations
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2011.09.071

[Display omitted] ► In this study, we measured the refractive index of GSAG in wavelength range 500–3000nm by optical absorption method. ► The effective segregation coefficient of Nd3+ in GSAG crystal during Czochralski growth was measured by optical absorption method. ► We studied the spectral properties of Nd:GSAG by Judd–Ofelt theory. GSAG and Nd:GSAG crystals were grown by standard Czochralski technique. The refractive index of GSAG in the wavelength range 500–3000nm, effective segregation coefficient and absorption cross sections of Nd3+ in GSAG were determined by optical absorption method. The effective segregation coefficient was calculated to be 0.525. The spectroscopic and laser properties of Nd:GSAG crystal were studied by Judd–Ofelt analysis. The Judd–Ofelt parameters were calculated to be Ω2=1.32×10−21cm2, Ω4=2.93×10−20cm2 and Ω6=3.91×10−20cm2. With these intensity parameters, the values of absorption and emission oscillator strengths, transition probabilities, fluorescence ratios and radiative lifetimes were obtained. The large fluorescence ratio of |[4F]3/2〉 is very favorable for laser operation at 942nm. These results confirm that Nd:GSAG is a suitable laser material for water vapor detection by DIAL.