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ARROW's in KTiOPO4

 

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IEEE Photonics Technology Letters 9 (1997), Nr.4, S.470-472
ISSN: 1041-1135
Englisch
Zeitschriftenaufsatz
Fraunhofer IOF ()
ion exchange; KTP; waveguide

Abstract
Antiresonant reflecting optical waveguides (ARROWS) have been designed and fabricated in z-cut KTiOPO4 (KTP) by e-beam direct writing and double Rb <--> K ion exchange. Strong diffusion anisotropy allows the realization of ARROW's in this electrooptical crystal. It was found, that argon-ion dry etching of the crystal surface prevents the ion exchange process totally. Using this as a new masking technique, antiresonant reflectors with lateral tolerances of less than 0.1 mu m could be realized. Typical quasi-single-mode waveguiding and attenuation of about 1.0 dB/cm were observed at lambda = 860 nm, which are in good agreement with our simulations made by the vectorial finite element method and effective index approach.

: http://publica.fraunhofer.de/dokumente/PX-4632.html