Microspectroscopy of ultrafast laser inscribed channel waveguides in Yb:tungstate crystals
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We report microspectroscopy measurements of crystalline channel waveguides fabricated in Yb:KGd(WO4)(2) and Yb:KY(WO4)(2) using the ultrafast laser inscription technique. From these measurements we find that densification of the WO2W bridge in the double tungstate crystal lattice is responsible for the refractive index increase, which creates the waveguide confinement. We identified that shifts toward lower energies in the ~760 cm(-1) Raman mode indicate regions, which guide light polarized along the crystallographic b axis, while higher energy shifts in the 682 and 898 cm(-1) Raman lines correspond to guiding regions for light polarized along the crystallographic a axis.
Bain , F M , Silva , W F , Lagatsky , A A , Thomson , R R , Psaila , N D , Kar , A K , Sibbett , W , Jaque , D & Brown , C T A 2011 , ' Microspectroscopy of ultrafast laser inscribed channel waveguides in Yb:tungstate crystals ' Applied Physics Letters , vol 98 , no. 14 , 141108 . DOI: 10.1063/1.3573999
Applied Physics Letters
Copyright 2011, American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Applied Physics Letters, Vol 98, Issue 14, and may be found at: http://scitation.aip.org/content/aip/journal/apl/98/14/10.1063/1.3573999
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