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Introduction
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.
 Good UV transmission
High optical damage threshold
High birefringence High nonlinear coefficients
Physical and
Optical Properties:
|
KDP
|
KD*P(DKDP)
|
| Chemical Formula |
KH2PO4
|
KD2PO4
|
| Crystal Structure |
Tetragonal
|
Tetragonal
|
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
|
| Temperature Synchronism Width |
11.5 oC*cm
|
7.4 oC*cm
|
| Spectral Synchronism Width |
106
Å*cm
|
32
Å*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
|
| Sellmeier Equations |
| 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)
|
| 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
|
| 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
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KD*P
Single Crystals — Standard |
Designation
|
Operation
|
Input
|
Output
|
53.7
°
|
SHG
(II)
|
1064
nm
|
532
nm
|
59.5°
|
THG
(II)
|
1064
nm + 532 nm
|
355
nm
|
63.7°
|
SFM
(II)
|
1064
nm + (421-1000 nm)
|
302-515
nm
|
86°
|
FHG
(I) angle tune
|
532
nm
|
266nm
|
90°
|
FHG
(I) temp. tune
|
532
nm
|
266
nm
|
36.6°
|
SHG
(I)
|
1064
nm
|
532
nm
|
46.8°
|
THG(I)
|
1064
nm + 532 nm
|
355
nm
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KD*P Specifications
Wavefront
distortion:
|
less
than l/8
@ 633nm
|
Dimension
tolerance:
|
(W± 0.1mm) x (H±0.1mm)
x (L + 0.2mm/-0.1mm)
|
Clear
aperture:
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>
90% central area
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Flatness:
|
l/8
@ 633nm
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Scratch/Dig
code:
|
10/5
to MIL-O-13830A
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Parallelism:
|
better
than 20 arc seconds
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P
erpendicularity:
|
5
arc minutes
|
Angle
tolerance:
|
Dq <± 0.3°, Df <±0.3°
|
Quality
Warranty Period:
|
one
year under proper use
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Note:
1.
KDP, KD*P&LiIO3
is highly hygroscopic and the coating
can not be available. Please keep it in a dry environment,
and sealed housing is recommended.
2.The
LiIO3 crystals is available too.
3.KD*P & KDP 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.Because their polished
surfaces are easy subject to moisten, the user recommends
a dry condition (<50%) and the sealed housing for preservation.
Note:
The LiIO3 crystals is available too.
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