KDP and DKDP(KD*P)
Description:
Potassium Dihydrogen Phosphate (KDP) and Potassium Dideuterium Phosphate (DKDP, 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.
Applications:
Second, third, and fourth harmonic generation of Nd:lasers;
Frequency doubling of Dye Laser;
Frequency Conversion of high power lasers;
Shutter for high speed photography;
Electro-optical Modulator, Q-switches, Shutter for high speed photography.
Physical and Optical Properties:
KDP | DKDP | |
Crystal Structure | Tetragonal, space group D4h | Tetragonal, space group D4h |
Lattice Parameters (Å) | a=7.4529, c=6.9751 | a=7.4697, c=6.9766 |
Curie point (°C) | ~396 | ~495 |
Mohs Hardness | ~2.5 | ~2.5 |
Density (gram/cm3) | 2.332 | 2.355 |
Hygroscopic Susceptibility | high | high |
Thermal Conductivity (W/cm/K) | k11= 1.9 x 10-2 | k11= 1.9 x 10-2 |
k33= 2.1 x 10-2 | ||
Thermal Expansion Coefficients (K-1) | a11= 2.5 x 10-5 | a11= 1.9 x 10-5 |
a33= 4.4 x 10-5 | a33= 4.4 x 10-5 | |
Resistivity (ohm • cm) | 10-20 x 106 | 10 x 106 |
Relative Dielectric Constant (@ 25°C and 1KHz) | εT11/ε0= 43.2,εs11/ε0=42.5 | εT11/ε0= 65.0,εs11/ε0= 62.5 |
εT33/ε0=20.8,εs33/ε0=20.0 | εT33/ε0= 50.0,εs33/ε0= 48.0 |
Optical and Nonlinear Properties:
KDP | DKDP | |
Transparency Range | 180-1500nm | 200-2100nm |
Electro-Optics Coefficients (pm/V) | r41=8.8, r63=10.3 | r41=8.8, r63=25 |
Refractive Index @ 1064nm | no=1.4938, ne=1.4599 | no=1.4948, ne=1.4554 |
Sellmeier Equations of KDP | ||
no2 = 2.259276 + 0.01008956/(λ2- 0.012942625) + 13.005522λ2 /(λ2- 400) | ||
ne2 = 2.132668 + 0.008637494/(λ2 - 0.012281043) + 3.2279924λ2/(λ2- 400) | ||
Sellmeier Equations of DKDP | ||
no2 = 1.9575544 + 0.2901391/(λ2- 0.0281399) - 0.02824391λ2 +0.004977826λ4 | ||
ne2 = 1.5005779 + 0.6276034/(λ2 - 0.0131558) - 0.01054063λ2 +0.002243821 λ4 | ||
Effective Nonlinear Optical Coefficient @ 1064nm (pm/V) | d36=0.44 | d36=0.40 |
Specifications:
Dimension tolerance | (W +/-0.1mm)x(H+/-0.1mm)x(L+0.2mm/-0.1mm) |
Wavefront distortion | Less than λ/8 @ 633nm |
Clear auperture | >90% central area |
Flatness | λ/8 @ 633nm |
Surface Quality | 10/5 Srcatch/Dig |
Parallelism | better than 20 arc seconds |
Perpendicularity | 5 arc nimutes |
Angle tolerance | theta delta<0.3 deg, phi delta<0.3 deg |
Quality Warranty Period | 3 month under proper use |