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DKDP  KDP

Potassium Dihydrogen Phosphate (KDP) and Potassium Dideuterium Phosphate (DKDP) are one of the most widely-used commercial NLO crystals. KDP and DKDP crystals are commonly used for doubling, tripling of 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.

Physical and Optical Properties:

 

KDP

DKDP (KD*P)

Chemical Formula

KH2PO4

KD2PO4

Crystal Structure

Tetragonal

Tetragonal

Transmission Range

200-1500nm

200-1600nm

Nonlinear Coefficients

d36=0.44pm/V

d36=0.40pm/V

Refractive Indices (at 1064nm)

no=1.4938,  ne=1.4599

no=1.4948,  ne=1.4554

Electro-Optical Coefficients

r41=8.8pm/V
r
63=10.3pm/V

r41=8.8pm/V
r
63=25pm/V

Longitudinal Half-Wave Voltage

Vp=7.65KV(l=546nm)

Vp=2.98KV(l=546nm)

Absorption

0.07/cm

0.006/cm

Temperature Synchronism Width

11.5 oC*cm

7.4 oC*cm

Spectral Synchronism Width

106 *cm

32 *cm

Angle Synchronism Width

0.84 mrad*cm

0.94 mrad*cm

Absorption Coefficient, cm-1

0.07

0.006

Mohs Hardness

2.5

2.5

Optical Damage Threshold

>5 GW/cm2

>3 GW/cm2

Extinction Ratio

-

30dB

Sellmeier Equations

KDP

no2 = 2.259276 + 0.01008956/(l2 - 0.012942625) + 13.005522l2/(l2 - 400)
ne2 = 2.132668 + 0.008637494/(
l2 - 0.012281043) + 3.2279924l2/(l2 - 400

DKDP

no2 = 1.9575544 + 0.2901391/(l2 - 0.0281399) - 0.02824391l2 +0.004977826l4
ne2 = 1.5005779 + 0.6276034/(l2 - 0.0131558) - 0.01054063l2 +0.002243821l4

       

 Specifications:

Wavefront distortion:

less than l/8 @ 633nm

Dimension tolerance:

(W 0.1mm) x (H 0.1mm) x (L + 0.2mm/-0.1mm)

Clear aperture:

> 90% central area

Flatness:

l/8 @ 633nm

Scratch/Dig code:

10/5 to MIL-O-13830A

Parallelism:

better than 20 arc seconds

P perpendicularity:

5 arc minutes

Angle tolerance:

Dq < 0.3, Df < 0.3

Application:

  • Good UV transmission
  • High optical damage threshold

Note:

KDP, DKDP is hygroscopic, so a dry condition (<50%) and the sealed housing for preventing it from moisture has to be considered. 

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