Date of download: 7/9/2016 Copyright © 2016 SPIE. All rights reserved. Comparison of luminescence spectra for Tm3+/Yb3+ codoped bulk ZLAG glass and ZLA waveguide (WG6) under 980-nm excitation. The intensity in the NIR is divided by 50 for both spectra. The dependence of blue and red emissions of Tm3+ versus Yb3+ content is shown in the inset. Figure Legend: From: Up-conversion visible emission in rare-earth doped fluoride glass waveguides Opt. Eng. 2014;53(7): doi: /1.OE

Date of download: 7/9/2016 Copyright © 2016 SPIE. All rights reserved. Absorption coefficient measured at 974 nm versus concentration of Yb3+. Figure Legend: From: Up-conversion visible emission in rare-earth doped fluoride glass waveguides Opt. Eng. 2014;53(7): doi: /1.OE

Date of download: 7/9/2016 Copyright © 2016 SPIE. All rights reserved. Room temperature absorption spectra of (a) Pr3+/Yb3+, (b) Er3+, Tm3+/Yb3+, and Er3+/Tm3+/Yb3+ doped ZLAG glasses in the visible and near-infrared (NIR) range. All absorptions come from the ground state of Er3+ (I15/24), Tm3+ (H63), Pr3+ (H43), and Yb3+ (F25/2). The absorption of the glass containing 10 mol% Yb3+ is divided by 10 in the NIR. Figure Legend: From: Up-conversion visible emission in rare-earth doped fluoride glass waveguides Opt. Eng. 2014;53(7): doi: /1.OE

Date of download: 7/9/2016 Copyright © 2016 SPIE. All rights reserved. Refractive index profile of Pr3+/Yb3+ codoped ZLA waveguide (WG2). Figure Legend: From: Up-conversion visible emission in rare-earth doped fluoride glass waveguides Opt. Eng. 2014;53(7): doi: /1.OE

Date of download: 7/9/2016 Copyright © 2016 SPIE. All rights reserved. XRD pattern of as made 0.5 Pr3+/10Yb3+ codoped ZLAG bulk glass ceramic and a photograph of the sample. Figure Legend: From: Up-conversion visible emission in rare-earth doped fluoride glass waveguides Opt. Eng. 2014;53(7): doi: /1.OE

Date of download: 7/9/2016 Copyright © 2016 SPIE. All rights reserved. Energy level diagrams of Yb3+, Er3+, Pr3+, Tm3+ ions showing possible UC mechanisms in (a) Pr3+/Yb3+ and (b) Er3+/Tm3+/Yb3+ doped materials. The D12 level of Tm3+ can be populated either by energy transfer (ET) or by a cooperative energy transfer (CET). Figure Legend: From: Up-conversion visible emission in rare-earth doped fluoride glass waveguides Opt. Eng. 2014;53(7): doi: /1.OE

Date of download: 7/9/2016 Copyright © 2016 SPIE. All rights reserved. Log–log plot of the blue, red, and NIR up-conversion emission intensities as function of the excitation power for 0.75Tm3+/2.25Yb3+ codoped ZLAG glass. Figure Legend: From: Up-conversion visible emission in rare-earth doped fluoride glass waveguides Opt. Eng. 2014;53(7): doi: /1.OE

Date of download: 7/9/2016 Copyright © 2016 SPIE. All rights reserved. Comparison of luminescence from Pr3+/Yb3+ codoped ZLAG bulk glass and ZLA waveguide (WG1) under 980-nm excitation. The green emission in the range 520 to 560 nm is due to Er3+ impurities. The dependence of blue and red emissions of Pr3+ versus Yb3+ content is shown in the inset. Figure Legend: From: Up-conversion visible emission in rare-earth doped fluoride glass waveguides Opt. Eng. 2014;53(7): doi: /1.OE

Date of download: 7/9/2016 Copyright © 2016 SPIE. All rights reserved. Log-log plot of the blue (479 nm) and red (634 nm) UC emission intensities as function of the excitation power for 0.5Pr3+/5Yb3+ codoped ZLAG glass. The green emission of Er3+ impurities (549 nm) is also reported. Figure Legend: From: Up-conversion visible emission in rare-earth doped fluoride glass waveguides Opt. Eng. 2014;53(7): doi: /1.OE

Date of download: 7/9/2016 Copyright © 2016 SPIE. All rights reserved. Luminescence spectra for Er3+/Tm3+ codoped and Er3+/Tm3+/Yb3+ tridoped bulk ZLAG glasses under 980-nm excitation. The spectra are normalized to the maximum intensity of red emission at 654 nm. Figure Legend: From: Up-conversion visible emission in rare-earth doped fluoride glass waveguides Opt. Eng. 2014;53(7): doi: /1.OE

Date of download: 7/9/2016 Copyright © 2016 SPIE. All rights reserved. CIE(X,Y) standard chromaticity diagram showing the points of the UC emission of xEr3+/yTm3+/10Yb3+ triply doped glass ceramic: (a) x=0.5/y=0.5, (b) x=0.5/y=0.75, and (c) x=0.75/y=0.5 (mol%). Figure Legend: From: Up-conversion visible emission in rare-earth doped fluoride glass waveguides Opt. Eng. 2014;53(7): doi: /1.OE