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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 under 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.
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KDP and KD*P(DKDP) Standard Orientation
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Process (PM type)
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KDP
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KD*P (DKDP)
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Orientation
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Deff(pm/V)
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Orientation
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Deff(pm/V)
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SHG (II): 1064 nm -> 532 nm
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58.9
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0.34
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53.5°
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0.34
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THG (II): 1064+532 -> 355 nm
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58.4
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0.37
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59.4°
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0.33
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SFG (II): 1064+(421-1000 nm) -> 302-515 nm
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61.0
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0.36
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63.7°
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0.31
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FHG (I): 532 nm -> 266nm
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76.7
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0.46
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85.9°
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0.43
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NCPM FHG (I): 532 -> 266 nm
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90°(T=250°C)
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0.47
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90°(T=55°C)
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0.43
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SHG (I): 1064 nm -> 532 nm
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41.1
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0.26
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36.6°
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0.22
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THG(I): 1064+532 -> 355 nm
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47.4
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0.32
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46.8°
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0.29
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