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KDP KD*P Crystal

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

KDP and KD*P are hygroscopic, a sealed housing with transmitting windows is recommended for protection of the crystal faces.

KDP KD*P Crystal

KDP/KD*P Physical and Optical Properties

Property KDP KD*P
Chemical Formula
Transparency Range
Nonlinear Coefficients
Refractive Index (at 1064nm)
Electro-Optical Coefficients
Longitudinal Half-Wave Voltage:
Damage Threshold:
Extinction Ratio:
d 36 =0.44pm/V
No=1.4938, Ne=1.4599
r41=8.8pm/V, r63=10.3pm/V
Vp =7.65KV @546nm
>5 GW/cm²
d 36 =0.40pm/V
No=1.4948, Ne=1.4554
r41=8.8pm/V, r63=25pm/V
Vp =2.98KV @546nm
>3 GW/cm²

Sellmeier Equations of KDP (λ in μm):
No 2 = 2.259276 + 0.01008956/( λ2 - 0.012942625) +13.005522λ2 /(λ2 - 400)
Ne 2 = 2.132668 + 0.008637494/( λ2 - 0.012281043) +3.2279924λ2 /(λ2 - 400)

Sellmeier Equations of KD*P (λ in μm):
No 2 = 1.9575544 + 0.2901391/( λ2 - 0.0281399) - 0.02824391λ2 +0.004977826 λ4
Ne 2 = 1.5005779 + 0.6276034/( λ2 - 0.0131558) - 0.01054063λ2 +0.002243821 λ4

KDP/KD*P Specifications

Dimension Tolerance: +0/-0.1mm(WxH) and+0.1/-0.2mm thickness
Surface Quality: 10-5 Scratch-dig
Flatness: <λ/8 @633nm
Chamfer: 0.1mm@45deg.
Clear Aperture: Central 90% of Diameter
Parallelism: <10 arc seconds
Perpendicular: <10 arc minutes
Orientation Angle: +/-0.25deg.
Damage Threshold: 0.3GW/cm2@1064nm10ns
Coating: Dual wavelength AR coating: R<0.2%

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