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 KDP (KH2PO4, or monopotassium phosphate, or potassium dihydrogen phosphate) s a water soluble crystal known for its non-linear optical properties.
KDP crystals are used for producing electro-optical elements (Pockels cells), waveplates, frequency converters (second, third and fourth harmonic generators for autocorrelators and cross-correlators, parametric generators and amplifiers) in various pulse lasers |
| Refractive index (22°C) | | dn/dT, 10-6/°C
(от 20 до 40°C) | | | Reflection loss | | | Linear absorption, сm-1 | | | Electro-optical indices @ λ=0.546µm, ×10-12m/V | | | Structure | Tetragonal, 42m | | Lattice constant ( ) | a=7.4529
c=6.9751 | | Density, g/ cm3 | 2.3325 | | Mohs’ hardness | 2±0.5 | | Vickers’ hardness | 122±17 II c
183±12 ⊥ c | | Maximal operating temperature, (°C) | 125 | | Index of linear expansion (270К),×10-6, K−1 | 42 IIc
26 ⊥c | | Specific heat, J/kg*К | 857 | | Thermal conductivity, W/mК | 1.21 IIc
1.3 ⊥c | | Transmission range (transmission over >50% of a sample 2 mm thick), µm | 0.176 1.55 | | 0.266µm | no=1.5599
ne=1.5105 | | 0.532µm | no=1.5129
ne=1.4709 | | 1.064µm | no=1.4944
ne=1.46035 | | 0.266µm | dno/dT= -38
dne/dT= -29 | | 0.532µm | dno/dT= -40
dne/dT= -29 | | 1.064µm | dno/dT= -48
dne/dT= -31 | | 0.266µm | e-beam: 4.8%
o-beam: 4.1% | | 0.532µm | e-beam: 4.2%
o-beam: 3.6% | | 1.06µm | e-beam: 3.9%
o-beam: 3.5% | | 0.263µm | ≈0.03 | | 0.527µm | ≤0.001 | | 1.054µm | ≈0.06 | | Non-linear index d36, 10-12m/V @ λ=1.064µm | 0.43 | | Angle of synchronism (°) for 2nd harmonic generation @ λ=1.064µm | - | | Type I (oo-e) | 41 | | Type II(eo-e) | 59 | | 90°-synchronism @ λ(µm) and Т(°C) | 0.518, 25°
0.527, 120° | | Specific resistance (106 Ohm*cm) | 10-20 | | r41 | 8.6 | | r63T | -10.5 | | r63S | -8.15 | | Half-wave voltage @ λ=0.546µm, kV | 7.65 | | Laser damage threshold, GW/cm2 (λ=1.06µm, τ=10ns) | 8 * |
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| * Can be improved by annealing |
KDP crystals / wafers for electro-optical elements |
| Diameter/Width | 1-100 mm | | Thickness/length | 1-40 mm | | Surface quality | Up to 30-50 , coated with water-repellent film |
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