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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 |
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| Electro-optical indices @ λ=0.546µm, ×10-12m/V | |
| Linear absorption, сm-1 | |
| Reflection loss | |
dn/dT, 10-6/°C
(от 20 до 40°C) | |
| Refractive index (22°C) | |
| 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 |
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| 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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