DKDP & KDP Crystal

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Characterized by good UV transmission, high damage threshold, and high birefringence, Potassium Dihydrogen Phosphate (KDP) and Potassium Dideuterium Phosphate (DKDP ) are among the most widely-used commercial NLO materials, though their NLO coefficients are relatively low. They are usually used for the doubling, tripling and quadrupling of Nd:YAG laser at room temperature. They are also excellent E-O crystals with high E-O coefficients, widely used as electro-optical modulators, such as Q-switches, Pockels Cells, etc.
KDP and DKDP crystals are developed by water-solution method and can grow up to very big size. Therefore, they are good options for low-cost and large-size finished non-linear components, e.g. for frequency-doubling (SHG), frequency-tripling (THG) and frequency- quadrupling (FHG) of Nd:YAG laser at 1064nm.

THATSHIGH Specifications for DKDP Crystal

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 @ 633 nm (L≥ 2.5mm); λ/4 @ 633nm (L< 2.5mm)
Chip	≤ 0.1mm
Surface Quality [S/D]	20/10
Parallelism	< 10"
Perpendicularity	≤ 10'
Angle Tolerance	≤ 0.2°
Damage Threshold	1GW/cm2 for 1064nm, 10ns, 10Hz (uncoated)
Interior Quality	No visible scattering paths or centers [inspected by 50mW green laser]