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.
Notes: Because polished surface
could easily catch moistures, KDP must be kept in dry condition (<50%) and
sealed housing.
Features:
Application:
-
Electro-optical modulator and Q switches
-
Second, third, and fourth harmonic
generation, frequency doubling of dyer laser
-
Shutter for high speed photography
-
High power laser frequency conversion
materials
Main Specifications
|
|
Angle tolerance |
<10� |
Dimension tolerance |
+(0.05~-0.2) mm |
Flatness |
λ/8 @
633nm |
Scratch/Dig code |
20/10 Scratch/dig
per MIL-O-13830A |
Parallelism |
better than 20
arc seconds |
Perpendicularity |
10 arc
minutes |
Wavefront distortion |
less than λ/8 @
633nm |
Clear aperture |
> 90% central
area |
Working temperature |
25�C |
|
Physical and
Optical Properties
|
|
|
|
KDP
|
KD*P(DKDP)
|
Chemical
Formula
|
KH2PO4
|
KD2PO4
|
Transmission Range |
200-1500nm
|
200-1600nm
|
Nonlinear Coefficients |
d36=0.44pm/V
|
d36=0.40pm/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
|
r41=8.8pm/V
r63=25pm/V
|
Longitudinal Half-Wave Voltage: |
Vp=7.65KV(l=546nm)
|
Vp=2.98KV(l=546nm)
|
Absorption: |
0.07/cm
|
0.006/cm
|
Optical Damage Threshold: |
>5 GW/cm2
|
>3 GW/cm2
|
Extinction Ratio: |
|
30dB
|
Sellmeier Equations of
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) |
Sellmeier Equations of
DK*P |
no2
=
1.9575544 + 0.2901391/(l2
- 0.0281399) - 0.02824391l2
+0.004977826l4
ne2
=
1.5005779 + 0.6276034/(l2
- 0.0131558) - 0.01054063l2
+0.002243821l4 |
|
|