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Potassium Dihydrogen Phosphate (KDP) and Potassium Dideuterium Phosphate (DKDP or KD*P)

Potassium Dihydrogen Phosphate (KDP) and Potassium Dideuterium Phosphate (KD*P ) are among the most widely-used commercial NLO materials, characterized by good UV transmission, high damage threshold, and high birefringence, though their NLO coefficients are relatively low. They are usually used for doubling, tripling and quadrupling of a Nd:YAG laser at the room temperature. In addition, they are also excellent electro-optic crystals with high electro-optic coefficients, widely used as electro-optical modulators, such as Q-switches, Pockels Cells, etc.

LaserMas KDP & KD*P products

LASERMA supplies high quality KDP and KD*P crystals in large quantities for these applications. Because their polished surfaces are easier to be moistened, however, the user is advised to provide a dry condition (<50%) and the sealed housing for preservation. For this purpose, LaserMa also provides polishing and sealed housing services for the KDP family crystals. Our engineers will serve you to select and design the best crystal, according to the laser parameters you provide.

Basic Properties

 

KDP

KD*P

Chemical Formula

KH2PO4

KD2PO4

Transparency Range

200-1500nm

200-1600nm

Nonlinear Coefficients

d36=0.44pm/V

d36=0.40pm/V

Refractive index (at 1064nm)

no=1.4938, ne=1.4599

No=1.4948, ne=1.4554

Electro-optical Coefficients

 

r41=8.8pm/V
r63=10.3pm/V

r41=8.8pm/V
r63=25pm/V

Longitudinal half-wave voltage:

V=7.65KV(=546nm)

V=2.98KV(=546nm)

Absorptance:

0.07/cm

0.006/cm

Optical damage threshold:

>5 GW/cm2

>3 GW/cm2

Extinction ratio:

 

30dB

Sellmeier equations of KDP:( in um)

no2=2.259276+0.01008956/(2-0.012942625)+13.005222/(2-400)
ne2=2.132668+0.008637494/(2-0.012281043)+3.22799242/(2-400)

Sellmeier equations of DKDP:( in um)

no2=1.9575544+0.29013912/(2-0.0281399)-0.028243912+0.0049778262
ne2=1.5005779+0.62760342/(2-0.0131558)-0.010540632+0.0022438212

 
 
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