Silica is the ideal material for a wide range of optical applications on account of its many desirable linear properties. For many important non-linear optical applications, such as second harmonic generation (SHG), silica cannot be used as it doesn’t possess an even ordered optical non-linearity. For some time now thermal poling has been used to create an artificial second order non-linearity in silica. While early results suggested that the resulting non-linearity was not large (less than 1 pm/V) or extensive enough (only 5 microns penetration into the substrate) to be practical, there has been a concerted effort to find new ways to improve upon and harness this ‘artificial’ non-linearity. In this presentation, we will show our recent results in SHG in both poled and unpoled multi-layer silica structures. We believe that these structures, of alternating doped and undoped silica, can be used to increase the size of the non-linear region in glass and improve the efficiency of poled devices. The second harmonic generated in our samples is compared to that produced in both a silica substrate and quartz. We show that a non-zero second order non-linearity is intrinsic to multi-layer structures and study the impact of varying the number of layers and doped/un-doped duty cycle. We then investigate impact of poling on the SHG in these samples. For un-poled samples we study the effect of using different dopants or varying the concentration. We conclude by discussing applications of these structures.
Seyed Hamed Jafari, Salah A. Aljamimi, Jacques Albert, and Christopher W. Smelser, "Study of second harmonic generation in poled and un-poled silica multilayer structures," Proc. SPIE 10528, Optical Components and Materials XV, 105281I (Presented at SPIE OPTO: February 01, 2018; Published: 22 February 2018); https://doi.org/10.1117/12.2291155.
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