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The fundamental absorption edge of KTiOPO4 (KTP) crystals has been investigated with the polarization spectroscopy technique in the temperature range of 80–300 K. The Urbach rule parameters, E0, α0, σ0, and hω, have been determined for the polarizations along each of the KTPs three crystallographic axes. A direct estimation of the KTP energy gap based on Urbach parameters has been made. A strong anisotropy of the gap has been found. The origin of the lowest energy electron excitations in KTP crystals and the possibility of self-trapping are discussed.
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Dudelzak et al. (2000) studied this question.
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