|
Potassium
Dihydrogen Phosphate, known as KDP (KH2PO4),
and its isomorphic crystals, deuterated KDP known as KD*P or DKDP
(KD2PO4), Ammonium Dihydrogen
Phosphate known as ADP (NH4H2PO4)
are widely used in frequency doubling, frequency tripling and frequency
quadrupling of Nd-doped laser systems, as well as the electro-optical
modulators. DKDP is mainly used in Pockels Cells, and ADP is also
used in Acousto-Optical devices.
(In
order to view symbols correctly, I.E. 4.0 or above is highly recommended.)
Optical
Properties:
| Crystal |
DKDP(KD*P)
|
KDP
|
ADP
|
| Transmitting
Range(nm): |
200~2150
|
180~1550
|
180~1500
|
| Absorption(%/cm): |
0.5
|
3
|
-
|
| Nonlinear
Optical Coefficient (pm/V): |
0.40
|
0.43
|
0.52
|
| Damage
Threshold: (GW/cm2 @1064nm) |
5
|
5
|
6
|
| Refractive
Indices: |
@1064nm |
no=1.4931
|
no=1.4942
|
no=1.5071
|
|
ne=1.4583
|
ne=1.4603
|
ne=1.4685
|
| @532nm |
no=1.5074
|
no=1.5129
|
no=1.5280 |
ne=1.4683
|
ne=1.4709
|
ne=1.4819
|
| @355nm |
no=1.5257
|
no=1.5317
|
no=1.5487
|
ne=1.4833
|
ne=1.4846
|
ne=1.4994
|
|
@266nm
|
no=1.5539
|
no=1.5599
|
no=1.5797
|
|
ne=1.5071
|
ne=1.5105
|
ne=1.5261
|
| Sellmeier
Equations: (l in µm)
|
N2
= A + B / (l2
- C) + Dl2/(l2
- E)
|
|
A
|
no
|
2.2409
|
2.2576
|
2.3041
|
|
ne
|
2.1260
|
2.1295
|
2.1643
|
|
B
|
no
|
0.0097
|
0.0101
|
0.0111
|
|
ne
|
0.0086
|
0.0097
|
0.0097
|
|
C
|
no
|
0.0156
|
0.0142
|
0.0133
|
|
ne
|
0.0120
|
0.0014
|
0.0129
|
|
D
|
no
|
2.2470
|
1.7623
|
15.1086
|
|
ne
|
0.7844
|
0.7580
|
5.8057
|
|
E
|
no
|
126.9205
|
57.8984
|
400.0000
|
|
ne
|
123.4032
|
127.0535
|
400.0000
|
Physical
Properties:
| Crystal |
KD*P(DKDP)
|
KDP
|
ADP
|
| Crystal
Structure: |
 2m
|
| Density(g/cm3): |
2.355
|
2.332
|
1.799
|
| Color: |
Colorless
|
| Hygroscopic
Susceptibility |
High
|
| Thermal
Conductivity(10-2W/cm·K): |
k11=1.9;k33=2.1
|
-
|
-
|
| Thermal
Expansion Coefficients(10-5/K): |
a11=1.9;a33=4.4
|
-
|
-
|
|