Nonlinear Optical Properties of Silver Composited Ge-In-S-CsI Chalcogenide Glasses

doi:10.3724/SP.J.1077.2014.13510

Abstract

Abstract:

In this study, the Ag doped 70GeS₂-20In₂S₃-10CsI chalcogenide glasses were synthesized by vacuumed melting-quenching technique. The third nonlinear optical properties were studied using Z-Scan technique at 800 nm. After being introduced Ag into the glass, both the linear and nonlinear refraction index γ increased from 2.204 to 2.2087 and from 23.3×10^-18 to 30.5×10^-18 m²/W, respectively. Besides, the nonlinear response time increased from 70 fs to 79 fs. The further heat treatment also enhanced the nonlinear refraction index up to 44.3×10^-18 m²/W, 2 folds higher than that of As₂Se₃. Meanwhile, the nonlinear absorption coefficient β decreased because the bandgap decreased with the thermal heat treatment. However, the highest figure of merit (FOM) is 3.3, which is enough for the nonlinear optics. Large nonlinear refraction index, high FOM, and fast response time ensured that the Ag-composited chalcogenide glass and glass ceramics can find applications in nonlinear optics.

Key words: Ag dopping, nonlinear refractive index, chalcogenide glass, Z-Scan, nonlinear response time

CLC Number:

TQ171

XU Yin-Sheng, CHENG Jun-Wen, QI Jia-Ni, LU Shan-Shan, LU Ke-Lun, XU Jian-Wei, SHAO Qi-Fen, DAI Shi-Xun. Nonlinear Optical Properties of Silver Composited Ge-In-S-CsI Chalcogenide Glasses[J]. Journal of Inorganic Materials, 2014, 29(7): 735-740.

Figures/Tables 6

Table 1 The refractive index, nonlinearity parameters and response time

Glass	Temp.-t/(℃-h)	n(@632.8 nm)	E_g/eV	γ/(×10^-18, m²∙W^-1)	β/(×10^-11, m∙W^-1)	F	Responsetime /fs
G	-	2.204	2.43	23.3	2.09	1.4	70
	350-12	-	2.43	21.6	-	-	-
	380-12	-	2.39	44.3	-	-	-
	380-18	-	2.30	31.6	-	-	-
GAg	-	2.2087	2.46	30.5	1.57	2.4	79
	350-12	-	2.46	31.1	-		-
	380-12	-	1.80	34.3	1.29	3.3	-
Ge₃₅As₁₅Se₅₀^{[18], a}		2.6	1.94^c	24.6	0.5	3.2	-
As₂Se₃^{[19], b}		2.864@1310nm	1.54^c	18	4.5	0.38^c	-
Silica^[20]		-	-	2.73×10^-2	-	-	-

Fig. 1 DSC curves of G and GAg glasses

Fig. 2 Absorption spectra of glass without (a) or with (b) AgCl addition heat-treatment under different conditions

Fig. 3 XRD patterns of GAg heat-treated under different conditions

Fig. 4 Closed-aperture Z-Scan curves of samples G (a)、G-380-18 (b)、GAg (c) and GAg-380-12 (d). The red solid lines are theoretical fits

Fig. 5 Open aperture Z-Scan curves of the samples at 800 nm

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