The optical characteristics of KDP/DKDP crystals, including thermal absorption and nonlinear absorption, wereinvestigated through thermal lens method and Z-scan method. It is found that the thermal absorption in KDP crystalbehaves anisotropy at 355nm and 532nm and nonlinear absorption anisotropy in KDP/DKDP crystals is also found at520nm. For KDP and DKDP samples, the thermal absorption coefficient of crystals with different orientations is slightlydifferent. The four-photon absorption coefficient γ of z-cut KDP sample is larger than that of other orientations. Therelationship of nonlinear absorption coefficient γ is z>II>I for KDP sample, while II≈z for DKDP sample.
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