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DKDP & KDP

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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.

Basic Properties of KDP & DKDP Crystal

 

KDP

DKDP

Chemical Formula

KH2PO4

KD2PO4

Transparency Range

200nm-1500nm

200nm-1600nm

Nonlinear Coefficients

d36=0.44pm/V

d36=0.40pm/V

Refractive index (@1064nm)

no=1.4938, ne=1.4599

no=1.4948, ne=1.4554

Electro-optical Coefficients 

γ41=8.8pm/V
γ63=10.3pm/V

γ41=8.8pm/V
γ63=25pm/V

Longitudinal Half-wave Voltage

Vπ=7.65kV(λ=546nm)

Vπ=2.98kV(λ=546nm)

Absorptance

0.07/cm

0.006/cm

Sellmeier equations of KDP: (λ in μm)
no2=2.259276+0.01008956/(λ2-0.012942625)+13.00522λ2/(λ2-400) ne2=2.132668+0.008637494/(λ2-0.012281043)+3.2279924λ2/(λ2-400)

Sellmeier equations of DKDP: (λ in μm)
no2=1.9575544+0.2901391λ2/(λ2-0.0281399)-0.02824391λ2+0.004977826λ2
ne2=1.5005779+0.6276034λ2/(λ2-0.0131558)-0.01054063λ2+0.002243821λ2

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]

 

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