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Second harmonic generation of continuous wave ultraviolet light and production of β-BaB2O4 optical waveguides

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4 Author(s)
Degl'Innocenti, R. ; Nonlinear Optics Laboratory, Institute of Quantum Electronics, ETH Zurich, CH-8093 Zurich, Switzerland ; Guarino, A. ; Poberaj, G. ; Gunter, P.

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We report on the generation of continuous-wave (cw) ultraviolet (UV) laser light at λ=278 nm by optical frequency doubling of visible light in β-BaB2O4 waveguides. Ridge-type waveguides were produced by He+ implantation, photolithography masking, and plasma etching. The final waveguides have core dimension of a few μm2 and show transmission losses of 5 dB/cm at 532 nm and less than 10 dB/cm at 266 nm. In our first experiments, a second harmonic power of 24 μW has been generated at 278 nm in an 8 mm long waveguide pumped by 153 mW at 556 nm.

Published in:

Applied Physics Letters  (Volume:89 ,  Issue: 4 )