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KTP Crystals
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KTP crystal is mostly used as nonlinear crystals for frequency doubling of solid-state Nd:YAG
crystal or Nd:YVO4
crystal laser, as it has large nonlinear optical coefficients, wide angular bandwidth
and small walk-off angle, broad temperature and spectral bandwidth. KTP
crystal also has high
electro-optic(E-O) coefficient and low dielectric constant, and large figure
of merit, these features make it also widely used in electro-optic application.
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| KTP
Crystal Properties |
| Crystal Structure |
Orthorhombic, point group mm2 |
| Melting Point |
1172°C incongruent |
| Cell Parameters |
a =
6.404Ä, b = 10.616Ä, c = 12.814Ä, Z= 8 |
| Curie Point |
936 °C |
| Mohs Hardness |
~5 |
| Density |
3.01 g/cm3 |
| Hygroscopic Susceptibility |
no |
| Thermal Conductivity |
0.13
W/cm/K |
| Specific Heat |
0.1643 cal/g.°C |
| Electrical Conductivity |
3.5x10-8
s/cm (c-axis, 22°C, 1KHz) |
| Transmitting
Range |
350 nm~4500 nm |
| Refractive
Indices |
|
nx
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ny |
nz |
| 1064nm |
1.7377 |
1.7453 |
1.8297 |
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532nm |
1.7780 |
1.7886 |
1.8887 |
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| Absorption
Coefficients |
a
< 1% /cm @1064 nm and 532 nm |
| Therm-Optic
Coefficients |
dnx/dT=1.1x10-5/
°C,
dny/ dT=1.3x10-5/ °C, dnz/dT=1.6x10-5/ °C |
| Nonlinear
Optical Coefficients |
d31=2.54 pm/V,
d31=4.35 pm/V, d31=16.9 pm/V
d24=3.64 pm/V, d15=1.91 pm/V at 1064 nm
deff(II)≈ (d24 - d15)sin2f
2sin2q - (d15sin2f + d24cos2f)sinq |
| Electro-Optic
Coefficients |
|
Low frequency (pm/V) |
High frequency
(pm/V |
| r13 |
9.5 |
8.8 |
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r23 |
15.7 |
13.8 |
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r33 |
36.3 |
35.0 |
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r51 |
7.3 |
6.9 |
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r42 |
9.3 |
8.8 |
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| Dielectric
Constant |
eeff = 13 |
| Sellmeier
Equations |
nx2
= 3.0065+0.03901 / (l2-0.04251)-0.01327l2
ny2 = 3.0333+0.04154 / (l2-0.04547)-0.01408l2
nz2 = 3.3134+0.05694 / (l2-0.05658)-0.01682l2 |
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For more information please contact
TOPLENT PHOTONICS on: info@toplent.com
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Back to
Optical Crystals
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