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¡¡Products / Non Linear Crystals

KDP/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.,   
1.Structural and Physical Properties
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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¦Ð=7.65KV(¦Ë=546nm)
V¦Ð=2.98KV(¦Ë=546nm)
Absorptance:
0.07/cm
0.006/cm
Optical damage threshold:
>5 GW/cm2
>3 GW/cm2
Extinction ratio:
 ¡¡
30dB
Sellmeier equations of KDP:
no2=2.259276+0.01008956/(¦Ë2-0.012942625)+13.00522¦Ë2/(¦Ë2-400)
ne2=2.132668+0.008637494/(¦Ë2-0.012281043)+3.2279924¦Ë2/(¦Ë2-400)
Sellmeier Equations:
no2=1.9575544+0.2901391¦Ë2/(¦Ë2-0.0281399)-0.02824391¦Ë2+0.004977826¦Ë2
ne2=1.5005779+0.6276034¦Ë2/(¦Ë2-0.0131558)-0.01054063¦Ë2+0.002243821¦Ë2
2.DKDP or KD*P'Main Specifications
 

Transmitting wavefront distortion

<Lambda/8@633nm

Dimension tolerance

¡À0.1mm

Flatness

<Lambda/8@633nm

Perpendicularity

<5 arc minutes

Parallelism

<15 arc seconds

Suface Quality

10/5 Scratch/Dig Per Mil-O-13830A

Angle tolerance  
Theta<¡À 0.5¡ã,phi<¡À0.5¡ã

Coating

uncoated