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Potassium Dihydrogen Phosphate (KDP) and PDideuterium
Phosphate (DKDP) feature large size with good UV transmission, high damage threshold and high
birefringence, though their NLO coefficients are relatively low. They are commonly used for doubling,
tripling and quadrupling of Nd lasers at the room temperature. In addition, they are also excellent electro-optic
crystals, widely used as electro-optical modulators, Q-switches and Pockels cells.
Physical and Chemical 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
a33= 4.4 x 10-5 |
a11= 1.9 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) |
¦ÅT11/¦Å0=
43.2,¦Ås11/¦Å0=42.5,
¦ÅT33/¦Å0=20.8,¦Ås33/¦Å0=20.0 |
¦ÅT11/¦Å0=
65.0,¦Ås11/¦Å0= 62.5,
¦ÅT33/¦Å0= 50.0,¦Ås33/¦Å0=
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 at 1064nm |
no£½1.4938, ne£½1.4599 |
no£½1.4948, ne£½1.4554 |
| Sellmeier Equations of KDP |
no2 = 2.259276
+ 0.01008956/(¦Ë2- 0.012942625) + 13.005522¦Ë2
/(¦Ë2- 400)
ne2 = 2.132668 + 0.008637494/(¦Ë2
- 0.012281043) + 3.2279924¦Ë2/(¦Ë2-
400) |
| Sellmeier Equations of DKDP |
no2 = 1.9575544
+ 0.2901391/(¦Ë2- 0.0281399) - 0.02824391¦Ë2
+0.004977826¦Ë4
ne2 = 1.5005779 + 0.6276034/(¦Ë2
- 0.0131558) - 0.01054063¦Ë2 +0.002243821 ¦Ë4 |
| Effective Nonlinear Optical Coefficient @
1064nm (pm/V) |
d36=0.44 |
d36=0.40 |
Applications:
- 2nd, 3rd and 4th Harmonic Generation of Nd lasers
- 2nd Harmonic Generation of Dye Laser
- Frequency Conversion of high power lasers
- Electro-optical Modulator, Q-switches, Shutter for high speed
photography
OSICO Specifications:
| Apertures |
Up to 50x50mm |
| Length |
Up to 60mm |
| Dimension Tolerance |
(W¡À0.1mm) x ( H¡À0.1mm) x (L+0.2mm/-0.1mm) |
| Phase Matching Angle Tolerance |
¦¤¦È < 0.2°, ¦¤¦Õ < 0.2° |
| Transmitted Wavefront Distortion |
< ¦Ë/4 @ 633nm |
| Surface Quality |
20/10 S/D before coating, 40/20 S/D after coating |
| Parallelism |
< 20 arc seconds |
| Perpendicularity |
< 5 arc minutes |
| Clear Aperture |
90% central area |
| Edge Bevel |
0.15mm x 45¡ã¡À5¡ãchamfer |
| Optical Damage Threshold (before coating) |
KDP: > 15 GW/cm2for 1064nm 10ns pulse
DKDP: > 0.5 GW/cm2for 1064nm 10ns pulse
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| Coatings |
AR, BBAR and P-Coatings are avalaible according to customer's choice. |
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