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Potassium Dihydrogen Phosphate (KDP) and Potassium Dideuterium Phosphate (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. |
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Physical and Optical Properties:
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KDP |
KD*P |
Chemical Formula |
KH2PO4 |
KD2PO4 |
Crystal Structure |
Tetragonal |
Teragonal |
Transmission Range |
200-1500nm |
200-1600nm |
Nonlinar Coefficients |
d36 =0.44pm/v |
d36 =0.04pm/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 |
r43 =8.8pm/v
r63 =25pm/v |
Longitudinal Half-Wave Voltage |
Vp=7.56KV(1=546nm) |
Vp=2.98KV(1=546nm) |
Absorption |
0.07/cm |
0.006/cm |
Temperature Synchronism Width |
11.5 deg C*cm |
7.4 deg C*cm |
Spectral Synchronsim Width |
106 deg *cm |
32 deg *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 |
|
30dB |
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) |
K*DP |
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:
Second, third, and fourth harmonic generation of Nd:lasers.
Frequency doubling of dyer laser
High power laser frequency conversion materials
Shutter for high speed photography
Electro-optical modulator and Q switches
KD*P Single Crystals Standard |
Designation |
Operation |
Input |
Output |
53.7 deg |
SHG(II) |
1064nm |
532nm |
59.5 deg |
THG(II) |
1064nm+532nm |
355nm |
63.7 deg |
SFM(II) |
1064nm+(421-1000nm) |
302-515nm |
86 deg |
FHG(I)angle tune |
532nm |
266nm |
90 deg |
FHG(I) temp.tune |
532nm |
266nm |
36.6 deg |
SHG(I) |
1064nm |
532nm |
46.8 deg |
THG(I) |
1064nm+532nm |
355nm |
Z cut |
Q-switch |
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KDP&KD*P 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: |
lambda/8 @ 633nm |
Srcatch/Dig: |
10/5 to MIL-O-13830A |
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 |
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