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KDP and DKDP
crystal
Potassium
Dihydrogen Phosphate (KDP) and Potassium Dideuterium Phosphate (DKDP) are used
for electro-optical modulation and frequency conversion. They have High
nonlinearcoefficient and high optical damage threshold, and can be used as
electro-optical modulator, Q switches and shutters for high speed photography.
1.
Application:
*
Electro-optical modulator, Q switches;
* Second,
third and fourth harmonic generation,double frequency for dye laser;
* Shutter for
high speed photography;
* High power
laser frequency conversion materials;
2.
Main Parameters:
|
*
Chemical formula |
KH2PO4 |
KD2PO4
|
|
*
Symmetry |
42m |
42m |
|
*
Density (g/cm3) |
2.332 |
2.335 |
|
*
Lattice parameters |
a=b=7.453Å
c=6.975Å |
a=b=7.469Å
c=6.976Å |
|
*
Thermal expansion
Coefficients [1/K] |
α1
=α2 =24.9 X 10 -6
α3
=44 X 10 -6 |
α1
=α2 =24.9 X 10 -6
α3
=44 X 10 -6 |
|
*
Thermal conductivity
(W/cm
K) |
k1
= k2=1.9 x10 -2 |
k3=2.1x10
-2 |
|
*
Transmission |
200-1580 nm |
200-2150 nm |
|
*
Absorption
(
%/cm at 1.06μm ) |
3 |
0.5
|
|
*Curie temperature ( K ) |
123 |
222 |
|
*
Relative dielectric constant
|
At 1 KHz, 25℃
|
|
ε11T
ε11S
ε33T
ε33S |
42
44
21
21 |
65
58
50
48 |
|
Nonlinear optical coefficient
(pm/v) |
0.43 |
0.40 |
|
|
*Longitudinal half-wave
voltage |
8.8Kv(658.3 nm) |
3.5-4KV(632.8 nm) |
|
*
Laser damage
threshold (GW/cm 2)
nm) |
~ 5
(1064 nm) |
~
5(1064 |
|
*
SHG phase-matching angle at 1064 nm |
|
*
TypeⅠ |
41
0 |
37
0 |
|
*
TypeⅡ |
59
0 |
53.5
0 |
|
*
Refractive index |
|
1064nm
532nm
355nm
|
no
ne
no
ne
no
ne |
1.4942
1.4603
1.5129
1.4709
1.5377
1.4867 |
1.4931
1.4583
1.5074
1.4681
1.5257
1.4683 |
|
*
Sellmeier equation |
|
n2=A+B/(λ2-C)+Dλ2(λ2-E) |
|
|
A |
B |
C |
D |
E |
|
For KDP
For DKDP
|
no
ne
no
ne |
2.2576
2.1295
2.2409
2.1260 |
0.0101
0.0097
0.0097
0.0086 |
0.0142
0.0014
0.0156
0.0120 |
1.7623
0.7580
2.2470
0.7844 |
57.8984
127.0535
126.9205
123.4032 |
| |
|
|
|
|
|
|
|
|
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3.
Availability:
KDP
20*20*20-200*200*200mm
DKDP 15*15*15-60*60*60mm
4.
Typical size:
* 14x14x35
mm, SHG 1064 nm theta = 53.7 degree,phi= 0 degree,
Type II AR
1064+532 nm
* 14x14x30
mm, SHG 1064 nm theta = 36 degree,phi= 45 degree,
Type I AR
1064+532 nm
* 14x14x30
mm, THG 1064 nm, theta = 59 degree,phi = 0 degree
* DKDP for Pockel's cell,
10x10x21 mm,phi = o degree,
theta = 0 degree ,Deuterium rate > 97 %
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