DKDP (KD*P) Crystals

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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 paths or centers [inspected by 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 ) 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:

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