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

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Specifications:

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

Notes:

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

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

Designation	Operation	Input	Output
53.7°	SHG (II)	1064nm	532nm
59.5°	THG (II)	1064nm + 532nm	355nm
63.7°	SFM (II)	1064nm + (421-1000nm)	302-515nm
86°	FHG (I) angle tune	532nm	266nm
90°	FHG (I) temp. tune	532nm	266nm
36.6°	SHG (I)	1064nm	532nm
46.8°	THG(I)	1064nm + 532nm	355nm

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

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