Abstract
The formation of high-temperature phases in low-doped H:LiTaO3 waveguide layers in Z-cut LiTaO3 has been observed both by refractive-index and IR-spectra measurements. This permits us to correlate the index jumps to the changes of the OH bonds in the crystal lattice. Reversible phase transitions were detected in the temperature interval T=50–200 °C over a wide range of hydrogen content including as-grown LiTaO3. The high-temperature phases are metastable close to room temperature. This was demonstrated by tracing the time evolution of the refractive-index change. It was shown that the high-temperature phases are responsible for the long-term refractive-index instabilities in both H:LiTaO3 waveguides and virgin LiTaO3.
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Received: 7 May 2001 / Revised version: 10 August 2001 / Published online: 30 October 2001
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Atuchin, V., Dimova-Malinovska, D., Grigorieva, T. et al. Metastable phases in HxLi1-xTaO3 waveguide layers and pure LiTaO3. Appl Phys B 73, 559–563 (2001). https://doi.org/10.1007/s003400100710
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DOI: https://doi.org/10.1007/s003400100710