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Nonlinear Crystals

  • Product Name: KDP KD*P
  • Dimension Tolerance :W x H (+/- 0.1mm) x L (+0.2/-0.1mm)
  • Angle Tolerance:Δθ ≤ 0.25°, Δφ ≤ 0.25°
  • Parallelism:< 20 arc seconds
  • Perpendicularity:< 5 arc minutes
  • Chamfer:0.1mm at 45°
  • Clear Aperture:90%
  • Scratch and Dig:20/10
  • Surface Flatness:λ/8 at 633nm
  • Wavefront Distortion:λ/8 at 633nm
  • Damage Threshold :KDP > 5 GW/cm2 at 1064nm, 10ns, 10Hz DKDP > 3 GW/cm2 at 1064nm, 10ns, 10Hz

Product overview

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.



Scitlion is able to offer
Rod diameter from 1mm to 40mm
Length from 1mm to 60mm
Coating upon your request
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KDP

DKDP

Chemical Formula

KH2PO4

KD2PO4

Transparency Range 

200nm-1500nm

200nm-1600nm

Nonlinear Coefficients

d36=0.44 pm/V

d36=0.40 pm/V

Refractive index ( at 1064nm)

no=1.4938, ne=1.4599

no=1.4948, ne=1.4554

Electro-optical Coefficients 

γ41=8.8pm/V
γ63=10.3pm/V

γ41=8.8pm/V
γ63=25pm/V

Longitudinal Half-wave Voltage

Vπ=7.65kV(λ=546nm)

Vπ=2.98kV(λ=546nm)

Absorption Coefficients 

7% cm-1

0.6% cm-1

Sellmeier Equations  KDP  (λ in μm) 
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  DKDP  (λ in μm)
no2=1.9575544+0.2901391λ2/(λ2-0.0281399)-0.02824391λ2+0.004977826λ2 
ne2=1.5005779+0.6276034λ2/(λ2-0.0131558)-0.01054063λ2+0.002243821λ2