KDP & DKDP Crystal Potassium Dihydrogen Phosphate And Potassium Dideuterium Phosphate
KDP Potassium Dihydrogen Phosphate and KDP or DKDP Potassium Dideuterium Phosphate are among the most widely-used commercial NLO materials, characterized by good UV transmission, high damage threshold, and high birefringence, though their NLO coefficients are relatively low. They are usually used for doubling, tripling and quadrupling of a Nd:YAG laser under the room temperature. In addition, they are also excellent electro-optic crystals with high electro-optic coefficients, widely used as electro-optical modulators, such as Q-switches, Pockels Cells, etc.
Technical parameters of KDP or DKDP
Tolerance of cutting angle | △θ≤±0.25°,△φ≤±0.25° |
Tolerance of dimension | Dimension+0/-0.1 mm，L：±0.1mm |
Flatness | λ/10 @ 632.8nm |
Wavefront distortion | λ/8@ 632.8nm |
Surface quality | 10/5 per MIL-O-13830A |
Parallelism | 20″ |
Perpendicularity | 10′ |
Clear Aperture: | > 90% |
Chamfer: | < 0.1 mm @ 45° |
Size | Upon customer request |
Coating | AR/HR coating upon customer’s request |
Damage Threshold | 750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz |
Quality Warranty Period | One year under proper use |
Optical and Nonlinear properties of KDP or DKDP
KDP | DKDP / KDP | |
Chemical Formula | KH2PO4 | KD2PO4 |
Transparency Range | 200-1500nm | 200-1600nm |
Nonlinear Coefficients | d36=0.44pm/V | d36=0.40pm/V |
Refractive index（@1064nm） | no=1.4938，ne=1.4599 | no=1.4948，ne=1.4554 |
Electro-optical Coefficients | r41=8.8pm/V | r41=8.8pm/V |
r63=10.3pm/V | r63=25pm/V | |
Longitudinal half-wave voltage | Vπ=7.65KV(λ=546nm) | Vπ=2.98KV(λ=546nm) |
Absorptance | 0.07/cm | 0.006/cm |
Optical damage threshold | ＞5GW/cm2 | ＞3GW/cm2 |
Extinction ratio | 30dB | |
Sellmeier equations of KDP (λ in μm) | no2=2.259276+0.01008956/(λ2-0.012942625)+13.00522λ2/(λ2-400) | |
ne2=2.132668+0.008637494/(λ2-0.012281043)+3.2279924λ2/(λ2-400) | ||
Sellmeier equations of KD*P (λ in μm) | no2=1.9575544+0.2901391λ2/(λ2-0.0281399)-0.02824391λ2+0.004977826λ4 | |
ne2=1.5005779+0.6276034λ2/(λ2-0.0131558)-0.01054063λ2+0.002243821λ4 | ||
