Acoustic and optical properties of thallium ion-exchanged KTiOPO4

Both acoustic and optical properties of thallium ion-exchanged KTiOPO4 (Tl:KTP) plates were examined. Surface acoustic wave (SAW) velocity of the thallium-exchanged z-cut KTP possesses a reduction of 13% from the unchanged KTP. Temperature stability of SAW resonance (1/f0 df/dT) changed from ≊−81 pp...

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Bibliographic Details
Published in:Applied physics letters 1994-10, Vol.65 (16), p.1989-1991
Main Author: Chu, David K. T.
Format: Article
Language:English
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Summary:Both acoustic and optical properties of thallium ion-exchanged KTiOPO4 (Tl:KTP) plates were examined. Surface acoustic wave (SAW) velocity of the thallium-exchanged z-cut KTP possesses a reduction of 13% from the unchanged KTP. Temperature stability of SAW resonance (1/f0 df/dT) changed from ≊−81 ppm of an untreated z-cut KTP substrate to ≊−121 ppm of a z-cut Tl:KTP substrate. Large optical refractive indices changes at the Tl ion-exchanged surface were observed [Δneff(TE)≊0.3, Δneff(TM)≊0.22]. Tl ion concentration profile from the crystal surface into substrate was also studied using electron beam microscopy and the optical index m-line measurement. Tl-exchanged KTP, therefore, possesses both acoustic and optical waveguiding properties.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.112839