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We present the results of the experimental study of laser-induced absorption (LIA) in KTiOPO4 crystal (KTP) under the action of laser radiation of wavelengths 0.37-0.44, 0.53, and 0.68-0.88 /m. Nw data are obtamed on the nature of the colour centers in KTP. The relationship is established between the LIA effect and laser damage threshold of the crystals. The influence is outlined of the LIA effect on the process of frequency doubling in KTP crystal.

The study of radiation paramagnetic centres (RPC) arising in flux-grown KTiOPO 4 (KTP) single crystals at X-ray-irradiation at 300 K was conducted by the ESR-method in the temperature range of 3.7÷300 K . For the first time in X-ray-irradiated KTP there were found electron and hole RPC stable at room temperature and related to Ti 3+ and Al 3+ impurity, respectively.

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