# New Candidate Multicomponent Chalcogenide Glasses for Supercontinuum Generation
## 6 Conclusions  
This paper reviews and summarizes the key optical and physical property attributes needed for materials being evaluated as candidates for SC generation. Following a summary of the key optical property criteria and those other physical properties which are impacted in the optical manufacturing of a component, we presented state-of-the art literature data for bulk glass, thin films, and fibers across the desired broadband spectral range of use. Employing a model broadband IR ChG system where extensive linear and initial nonlinear optical property data was collected, we have shown that novel multicomponent bulk GAP-Se ChG glasses exhibit high values of linear and nonlinear refractive indices which increase directly with Pb(Se) concentration, while maintaining high, broadband transparency, and low optical losses throughout the IR. Dispersion data has been calculated for bulk GAP-Se material and compared to thin films of the same composition, highlighting the variation of identical compositions and deposition-induced morphology variation (homogeneous films versus phase separated bulk glasses). The magnitudes of these optical parameters are found to be competitive with respect to those of commonly-used homogeneous ChG glasses in both linear and nonlinear optical regimes, as quantified by their nonlinear FOM. Further efforts to extend our understanding of this system, both as bulk glasses and in thin film or fiber form, will allow us to assess the glass' viability as potential SC hosts.  
Supplementary materials can be found at [[http://www.mdpi.com/2076-3417/8/11/2082/s1](http://www.mdpi.com/2076-3417/8/11/2082/s1)]([http://www.mdpi.com/2076-3417/8/11/2082/s1](http://www.mdpi.com/2076-3417/8/11/2082/s1)). [PERSON], [PERSON] and [PERSON] conceived and designed the study. [PERSON] fabricated bulk specimens. [PERSON] and [PERSON] fabricated thin film specimens. [PERSON] performed linear optical characterization and microstructure analysis. B.-U.S. and D.T.H.T. conducted nonlinear optical characterization. All authors wrote the manuscript together. [PERSON] supervised the project.  
Figure 4: (**a**) Closed- and open-modes Z-scan profiles of a glass with 20 mol% PbSe (bulk coupons with t = 2 mm performed at a wavelength of 4.5 \(\upmu\)m. (**b**) Closed- and open-mode Z-scan profiles of a glass with 40 mol% PbSe (bulk coupons with t = 2 mm). (**c**) Measured nonlinear refractive indices of glasses with 20 and 40 mol% PbSe at four different locations of the bulk samples. (**d**) Measured four-photon absorption coefficients for glasses with 20 and 40 mol% PbSe. The dashed lines represent the average of the measurements. The measurement error is estimated to be \(\sim\)10%.  
**Acknowledgments:** [PERSON] and M.K. acknowledge the partial support of UCF's Pre-eminent Post-doctoral Scholar Program (P3). [PERSON] and [PERSON] were supported in part by National Science Foundation under award #1506605. B.-U.S. and D.T.H.T. acknowledge the support of the MOE ACRF Tier 2 grant and National Research Foundation Competitive Research Program Grant. The authors thank [PERSON]. [PERSON] for spectroscopic ellipsometry characterization.  
**Conflicts of Interest:** The authors declare no conflict of interest.