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        • Product name: KD*P & KDP
        • Product ID: 111
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        Potassium Dihydrogen Phosphate (KDP) and Potassium Dideuterium Phosphate (DKDP or KD*P)

        Potassium Dihydrogen Phosphate (KDP) and Potassium Dideuterium Phosphate (KD*P ) are among the most widely-used commercial NLO materials, characterized by good UV transmission, high damage threshold, and high birefringence, though their NLO coefficients are relatively low. They are usually used for doubling, tripling and quadrupling of a Nd:YAG laser at the room temperature. In addition, they are also excellent electro-optic crystals with high electro-optic coefficients, widely used as electro-optical modulators, such as Q-switches, Pockels Cells, etc.

        CASTECH’s KDP & KD*P products

        CASTECH supplies high quality KDP and KD*P crystals in large quantities for these applications. Because their polished surfaces are easier to be moistened, however, the user is advised to provide a dry condition (<50%) and the sealed housing for preservation. For this purpose, Castech also provides polishing and sealed housing services for the KDP family crystals. Our engineers will serve you to select and design the best crystal, according to the laser parameters you provide.

                                                                                         Basic Properties

         

         

        KDP

        KD*P

        Chemical Formula

        KH2PO4

        KD2PO4

        Transparency Range

        200-1500nm

        200-1600nm

        Nonlinear Coefficients

        d36=0.44pm/V

        d36=0.40pm/V

        Refractive index (at 1064nm)

        no=1.4938, ne=1.4599

        No=1.4948, ne=1.4554

        Electro-optical Coefficients

         

        r41=8.8pm/V
        r63=10.3pm/V

        r41=8.8pm/V
        r63=25pm/V

        Longitudinal half-wave voltage:

        Vπ=7.65KV(λ=546nm)

        Vπ=2.98KV(λ=546nm)

        Absorptance:

        0.07/cm

        0.006/cm

        Optical damage threshold:

        >5 GW/cm2

        >3 GW/cm2

        Extinction ratio:

         

        30dB

        Sellmeier equations of KDP:(λ in um)

        no2=2.259276+0.01008956/(λ2-0.012942625)+13.00522λ2/(λ2-400)
        ne2=2.132668+0.008637494/(λ2-0.012281043)+3.2279924λ2/(λ2-400)

        Sellmeier equations of DKDP:(λ in um)

        no2=1.9575544+0.2901391λ2/(λ2-0.0281399)-0.02824391λ2+0.004977826λ2
        ne2=1.5005779+0.6276034λ2/(λ2-0.0131558)-0.01054063λ2+0.002243821λ2