High potassium KTiOPO4 crystals for the fabrication of quasi-phase matched devices
UNSPECIFIED. (2003) High potassium KTiOPO4 crystals for the fabrication of quasi-phase matched devices. JOURNAL OF PHYSICS D-APPLIED PHYSICS, 36 (11). pp. 1236-1241. ISSN 0022-3727Full text not available from this repository.
This paper reports a suppressed ionic conductivity in a KTiOPO4 (KTP) crystal grown from a potassium-rich K4P2O7 flux. Potassium-rich KTP is shown to have an ionic conductivity, which is reduced by one order of magnitude relative to normal flux-grown KTP and is explained by an improved potassium-oxygen stoichiometry. However, it is found that the frequency dispersion of the conductivity is almost identical in form to that of conventional KTP, showing that the fundamental Debye-like origin of the conductivity is unchanged as the number of potassium vacancies is decreased. This behaviour is contrasted with that of Rb-doped KTP, in which the conductivity is reduced by a factor of more than 100 and the dispersion is drastically changed to resemble a disordered system rather than a Debye-like relaxor. Potassium-rich KTP is also found to have a reduced low-frequency dielectric constant, a contracted Cole-Cole plot and a lowered ferroelectric coercive electric field of only 3.0(+/-0.1) kV mm(-1) at room temperature. Successful periodic poling of a potassium-rich KTP crystal to produce a grating of 60 mum period is demonstrated at room temperature for the first time. X-ray topographs proving the existence of periodic domains throughout the bulk of potassium-rich KTP in both the usual  grating orientation and the unconventional  orientation are presented.
|Item Type:||Journal Article|
|Subjects:||Q Science > QC Physics|
|Journal or Publication Title:||JOURNAL OF PHYSICS D-APPLIED PHYSICS|
|Publisher:||IOP PUBLISHING LTD|
|Date:||7 June 2003|
|Number of Pages:||6|
|Page Range:||pp. 1236-1241|
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