Electron paramagnetic resonance and electron nuclear double-resonance study of Ti3+ centres in KTiOPO4

Details Electron paramagnetic resonance and electron nuclear double-resonance study of Ti3+ centres in KTiOPO4 Electron paramagnetic resonance and electron nuclear double-resonance study of Ti3+ centres in KTiOPO4

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jpcm...15.3969s&link_type=abstract

Journal of Physics: Condensed Matter, Volume 15, Issue 23, pp. 3969-3984 (2003).

Physics

Condensed Matter

7

Scientific paper

Electron paramagnetic resonance and electron nuclear double resonance have been used to characterize four Ti3+ centres in undoped crystals of potassium titanyl phosphate (KTiOPO4 or KTP). These 3d1 defects (S = 1/2) are produced by ionizing radiation (either 60 kV x-rays or 355 nm photons from a tripled Nd:YAG laser), and form when the regular Ti4+ ions in the crystal trap an electron. Two of these trapped-electron centres are only observed in hydrothermally grown KTP and the other two are dominant in flux-grown KTP. Both of the Ti3+ centres in hydrothermally grown crystals have a neighbouring proton (i.e. an OH- molecule). In the flux-grown crystals, one of the Ti3+ centres is adjacent to an oxygen vacancy and the other centre is tentatively attributed to a self-trapped electron (i.e. a Ti3+ centre with no stabilizing entity nearby). The g matrix and phosphorus hyperfine matrices are determined for all four Ti3+ centres, and the proton hyperfine matrix is determined for the two centres associated with OH- ions. These Ti3+ centres contribute to the formation of the grey tracks often observed in KTP crystals used to generate the second harmonic of high-power, near-infrared lasers.

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