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  • DKDP (KD*P) Crystals
  • DKDP (KD*P) Crystals

DKDP (KD*P) Crystals

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Dimension Tolerance (W±0.1mm) ×(H±0.1mm)× (L+0.2mm/-0.1mm)
or (Dia ± 0.1mm)×(L+0.2/-0.1mm)
Wavefront Distortion < λ/8 @ 633nm
Clear Aperture > 90% of central area Chamfer ≤0.3mm @45°
Flatness λ/8 @ 633nm (L≥ 2.5mm)
λ/4 @ 633nm (L< 2.5mm)
Chips ≤ 0.1mm
Surface Quality 20/10 S/D Parallelism < 10"
Perpendicularity ≤ 10' Angle Tolerance ≤ 0.2°
Interior Quality No visible scattering paths or centers
[inspected by 50mW green laser]


  1. The blanks, laser grade polished DKDP crystals are available.
  2. For the DKDP crystals used in pockels cells, please click: the DKDP crystals for pockels cells.
  3. For DKDP pockels cells, please click: DKDP pockels cells.

Physical and Optical Properties:

Chemical Formula KD2PO4 Curie Temperature 222K
Symmetry 42m Density 2.355g/cm3
Absorption 0.005/cm Extinction Ratio 1:10000
Deuterium Ratio >98% Transmission Band 200-1600nm
Non-linear Coefficient d36=0.40pm/v Longitudinal Half-wave Voltage 2.98KV(I=546nm)
Electric Resistance >2x109Ώ/cm Electric –optical Coefficient r41=8.8pm/v, r63=25pm/v


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

Application Notes:

  1. SHG (doubling), THG (tripling) and FHG (quadrupling) for Nd:YAG lasers
  2. Electro-optical modulators, Q-switches, Pockels Cells


Designation OperationInputOutput
53.7°SHG (II)1064nm532nm
59.5°THG (II)1064nm + 532nm355nm
63.7°SFM (II)1064nm + (421-1000nm) 302-515nm 
86°FHG (I) angle tune 532nm266nm
90°FHG (I) temp. tune 532nm266nm
36.6°SHG (I)1064nm532nm
46.8°THG(I)1064nm + 532nm355nm