KTiOPO4 double barrier optical waveguides produced by Rb+-K+ ion exchange and subsequent He+-ion irradiation

Abstract. We report on the fabrication and characterization of KTiOPO4 optical waveguides formed by Rb+-K+ ion exchange in high-purity RbNO3 melt at 340°C for 90 min and subsequent He+-ion irradiation at energy of 500 keV and fluence of 3×1016  ions/cm2. The irradiation of KTiOPO4 crystals with He+ ions was simulated using the stopping range of ions in matter (SRIM’2006) software. The dark mode spectra of the samples were measured with the prism coupling method. The reconstructed refractive index profiles of the planar waveguide show a barrier in the middle of the guiding region, and a refractive index enhancement region on each side of the barrier, indicating the formation of a double waveguide.

[1]  THz wave transmission within the metal film coated double-dielectric-slab waveguides and the tunable filter application , 2015 .

[2]  M. Armenise,et al.  A comparative analysis of Rb:KTP and Cs:KTP optical waveguides , 1998 .

[3]  L. Boatner,et al.  Ion exchange in potassium titanyl phosphate , 1997 .

[4]  P. F. Heidrich,et al.  Optical waveguide refractive index profiles determined from measurement of mode indices: a simple analysis. , 1976, Applied optics.

[5]  Feng Chen,et al.  Bi-layer optical waveguide formed by double boron ion implantation into strontium barium niobate crystal , 2005 .

[6]  Lei Wang,et al.  Monomode low loss optical waveguide in KTiOPO4 formed by combining ion implantation with ion exchange , 2008 .

[7]  Yaogan Liu,et al.  Double barrier waveguides in KTiOPO4 formed by MeV He ion implantation , 1998 .

[8]  M. Carrascosa,et al.  Nonlinear optical waveguides generated in lithium niobate by swift-ion irradiation at ultralow fluences. , 2007, Optics letters.

[9]  Feng Chen,et al.  Micro‐ and submicrometric waveguiding structures in optical crystals produced by ion beams for photonic applications , 2012 .

[10]  M. Kudenov,et al.  Athermalized channeled spectropolarimetry using a biaxial potassium titanyl phosphate crystal. , 2013, Optics letters.

[11]  D. Djukic,et al.  Compositional and structural changes in LiNbO3 following deep He+ ion implantation for film exfoliation , 2006 .

[12]  P. J. Chandler,et al.  A New Approach to the Determination of Planar Waveguide Profiles by Means of a Non-stationary Mode Index Calculation , 1986 .

[13]  J. Ruske,et al.  Properties of buried waveguides produced by He-irradiation in KTP and Rb:KTP , 2004 .

[14]  Double waveguide in NdLiP4O12 laser crystal formed by MeV He+ ion implantation , 2005 .

[15]  Q. Lu,et al.  Enhanced refractive index well-confined planar and channel waveguides in KTiOPO4 produced by MeV C3+ ion implantation with low dose , 2009 .

[16]  Laurent Bigot,et al.  Few mode Er(3+)-doped fiber with micro-structured core for mode division multiplexing in the C-band. , 2013, Optics express.

[17]  G. Rosenman,et al.  Pyroelectric effect in KTiOPO4 and family crystals with monodomain and domain patterned structures , 2000 .

[18]  Feng Chen,et al.  Guided-wave phase-matched second-harmonic generation in KTiOPO4 waveguide produced by swift heavy-ion irradiation , 2014 .

[19]  Yujie J. Ding,et al.  Backward second-harmonic generation in submicron-period ion-exchanged KTiOPO4 waveguide , 2000 .