KD*P(DKDP) Crystal (Potassium Dihydrogen Phosphate and Potassium Dideuterium Phosphate)

Crystals >>> Nonlinear Crystals >>>  KD*P(DKDP) Crystal

Potassium Dihydrogen Phosphate (KDP) and Potassium Dideuterium Phosphate (KD*P ) are among the most widely-used commercial NLO materials.  They are commonly used for doubling, tripling and quadrupling 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, Q-switches, and Pockels Cells, etc.

Notes: Because polished surface could easily catch moistures,  KDP must be kept in dry condition (<50%) and sealed housing.

Features:

  • Good UV transmission

  • High optical damage threshold

  • High birefringence

  • High nonlinear coefficients

Application:

  • Electro-optical modulator and Q switches

  • Second, third, and fourth harmonic generation, frequency doubling of dyer laser

  • Shutter for high speed photography

  • High power laser frequency conversion materials

Main Specifications
Angle tolerance <10
Dimension tolerance +(0.05~-0.2) mm
Flatness λ/8 @ 633nm
Scratch/Dig code 20/10 Scratch/dig per MIL-O-13830A
Parallelism better than 20 arc seconds
Perpendicularity 10 arc minutes
Wavefront distortion less than λ/8 @ 633nm
Clear aperture > 90% central area
Working temperature 25C

 

Physical and Optical Properties

KDP
KD*P(DKDP)
Chemical Formula
KH2PO4
KD2PO4
Transmission Range
200-1500nm
200-1600nm
Nonlinear Coefficients
d36=0.44pm/V
d36=0.40pm/V
Refractive Indcies (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:
Vp=7.65KV(l=546nm)
Vp=2.98KV(l=546nm)
Absorption:
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/(l2 - 0.012942625) + 13.005522l2/(l2 - 400)
ne
2 = 2.132668 + 0.008637494/(
l2 - 0.012281043) + 3.2279924l2/(l2 - 400)
Sellmeier Equations of DK*P
no2 = 1.9575544 + 0.2901391/(l2 - 0.0281399) - 0.02824391l2 +0.004977826l4
ne
2 = 1.5005779 + 0.6276034/(
l2 - 0.0131558) - 0.01054063l2 +0.002243821l4

 

 

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