KDP & KD*P

KDP & KD*P

Potassium Dihydrogen Phosphate or KDP and Potassium Dideuterium Phosphate KD*P  are widely-used NLO materials. They are liked because of their good UV transmission, high damage threshold, and high birefringence degree. They are usually used in Nd:YAG laser systems which are made to work at the room temperature. More over, they can operate as excellent electro-optic crystals. Because of their high electro-optic coefficient they are widely used as electro-optical modulators.

  • Optola offers different sizes KDP and KD*P crystals. 
  • Variuos dimensions are available upon request.

Dimensional Tolerance

+/-0.1mm

Wavefront Distortion

< λ / 8@633nm

Chamfer

<0.15mm x 45°

Perpendicularity

< 5 arc min

Parallelism

<15 arc sec

Flatness

< λ / 10 @ 633nm

Surface quality

10/5

AR coating

From visible to 3.3um

Chemical Formula

KH2PO4

KD2PO4

Transparency Range

200-1500nm

200-1600nm

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

r41=8.8pm/V

r63=10.3pm/V

r41=8.8pm/V

r63=25pm/V

Longitudinal half-wave voltage

Vπ=7.65KV(λ=546nm)

Vπ=2.98KV(λ=546nm)

Absorptance

0.07/cm

0.006/cm

Optical damage threshold

>5GW/cm2

>3GW/cm2

Extinction ratio

 

30dB

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 KD*P (λ in μm)

no2=1.9575544+0.2901391λ2/(λ2-0.0281399)-0.02824391λ2+0.004977826λ4
ne2=1.5005779+0.6276034λ2/(λ2-0.0131558)-0.01054063λ2+0.002243821λ4

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