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KDP, DKDP
Potassium Dihydrogen Phosphate (KDP) and Deuterated Potassium Dihydrogen Phosphate (DKDP) are nonlinear optical materials (NLO) known for their large NLO coefficients, wide transparency range and high optical damage threshold.
These materials are used mostly for frequency conversion by second-harmonic generation (SHG) and for electro-optical modulation.
Main Properties
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Characteristics
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KDP
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DKDP
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Chemical Formula
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KH2PO4
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KD2PO4
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Crystal Structure
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Tetragonal
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Tetragonal
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Transmission Range, mm
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0.2-1.5
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0.2-1.6
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Electro-optical Coefficients, pmV-1
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R41=8.8, r63=10.3
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R41=8.8, r63=25
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Nonlinear Coefficient
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D36=0.44
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D36=0.40
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Temperature Synchronism Width, oC*cm
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11.5
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7.4
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Spectral Synchronism Width, Å*cm
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106
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32
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Angle Synchronism Width, mrad*cm
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0.84
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0.94
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Optical Damage Threshold, GW/cm2
(l=1.064 mm, t =10 ns)
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5
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3
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Absorption Coefficient, cm-1
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0.07
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0.006
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Mohs Hardness
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2.5
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2.5
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