Microspectroscopy of ultrafast laser inscribed channel waveguides in Yb: tungstate crystals

F. M. Bain, W. F. Silva, A. A. Lagatsky, R. R. Thomson, N. D. Psaila, A. K. Kar, W. Sibbett, D. Jaque, C. T A Brown

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Abstract

We report microspectroscopy measurements of crystalline channel waveguides fabricated in Yb:KGd (WO4)2 and Yb:KY (WO 4)2 using the ultrafast laser inscription technique. From these measurements we find that densification of the WO2 W 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. © 2011 American Institute of Physics.

Original languageEnglish
Article number141108
Number of pages3
JournalApplied Physics Letters
Volume98
Issue number14
DOIs
Publication statusPublished - 4 Apr 2011

Keywords

  • SPECTROSCOPY
  • RAMAN-SPECTRA
  • SINGLE-CRYSTALS
  • IRRADIATION

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    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, 98(14), [141108]. https://doi.org/10.1063/1.3573999