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

DKDP (KD*P) Crystals

  • For a variety of applications: SHG, THG, 4HG and EO Pockels Cells
  • Maximum dimension: 100x100x60mm
  • DKDP crystal blanks are also available
  • Strict QC inspection ensuring high-quality products
Inquire Us  
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 path or center
under the inspection 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 ) Crystals are one the most widely-used commercial nonlinear crystal. The most distinctive merits of DKDP crystals include their good UV transmission, high damage threshold, and high birefringence, though their NLO coefficients are relatively low. KD*P crystals are usually used for Second Harmonic Generation (SHG), Third Harmonic Generation (THG), and Fourth  Harmonic Generation (FHG) of Nd:YAG lasers at room temperature. In addition,  Potassium Dideuterium Phosphate crystals also inherit high electro-optic coefficients, making them be widely used as Electro-Optical Modulators, such as EO Q-switches, and EO Pockels Cells, etc.

Hangzhou Shalom EO offers DKDP crystals for NLO applications and EO modulations, The crystals are high-quality guaranteed, exhibiting no visible scattering path or center under the observation of 50mW green laser. Further strict QC inspections are done in Shalom EO's cleanroom before despatch. Both crystal blanks and laser-grade-polished (20/10 Scratch/Dig) DKDP crystals are available.

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
DKDP Crystals for EO Applications

DKDP Crystals for EO Applications

  • High Deuteration (>98.0%) DKDP Crystals
  • Broad Wavelength Range: 0.3~1.1μm
  • Maximum Aperture: 50mm
  • High Transmission: >98%
  • Cr-Au Electrode