click me!
  • 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
  • Transmission wavelength range: 200-2150nm
  • DKDP blanks, laser-grade polished crystals 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.

Basic Material 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 common industrial-grade NLO materials. Compared with traditional KDP crystals, the additional deuterium composition helps to expand the transmission wavelength range, and eliminate the detrimental parasitic oscillation resulting from Ramen Scattering, an issue that could be problematic in particular for high-power lasers. KD*P crystals are superior 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 excellent for being used as Electro-Optical Modulators, such as EO Q-switches, EO Pockels Cells, etc.

Other distinctive merits of DKDP crystals are being available in large dimensions and low fabrication cost, making DKDP the most prevalent crystals at the current stage for manufacturing large aperture nonlinear optical components. Other characteristics of DKDP include their good UV transmission, high birefringence, and low nonlinearities relative to other NLO materials.

Hangzhou Shalom EO offers DKDP crystals for NLO applications and EO modulations with various cutting angles and a maximum dimension of 100x100x60mm. The crystals are high-quality guaranteed, exhibiting no visible scattering path or center under the observation of a 50mW green laser. A high deuterium composition ratio (>98%) could be obtained. 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. Refer to DKDP Crystals for EO modulations, boules, blanks, and AR-coated crystals with Cr-Au electrodes are all accessible upon your request.

Application Notes:

 The cutting angles of the DKDP crystals and their corresponding frequencies-conversion applications are listed in the chart below:

Cutting Angle  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