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KD*P KDP
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Potassium Dideuterium Phosphate (KD*P ), the most widely-used commercial NLO crystals, is isomorphic to KDP crystal. KDP and KD*P 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
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High optical damage threshold
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Physical and Optical Properties
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KDP |
KD*P(DKDP) |
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 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 |
Temperature Synchronism Width |
11.5 oC*cm |
7.4 oC*cm |
Spectral Synchronism Width |
106 Å*cm |
32 Å*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 |
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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 |
DK*P |
no2 = 1.9575544 + 0.2901391/(l2 - 0.0281399) - 0.02824391l2 +0.004977826l4
ne2 = 1.5005779 + 0.6276034/(l2 - 0.0131558) - 0.01054063l2 +0.002243821l4 |
Application
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Second, third harmonic generation of Nd: YAG and Nd: glass lasers.
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Frequency doubling of dyer laser
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Shutter for high speed photography
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Electro-optical modulator.
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 erpendicularity: |
5 arc minutes |
Angle tolerance: |
qD < ± 0.3°, fD < ±0.3° |
Quality Warranty Period: |
one year under proper use |
Note:
KDP, KD*P is hygroscopic, so a dry condition (<50%) and the sealed housing for preventing it from moisture has to be considered.
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