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Potassium
Titanyl Phosphate, known as KTP( KTiOPO4), is
widely used in frequency doubling of Nd-doped laser systems for Green/Red
output; parametric sources(OPG, OPA and OPO) for 600nm-4500nm tunable
output; E-O modulators, Optical Switches, Directional Couplers;Optical
Waveguides for Integrated NLO and E-O Devices etc.
(in
order to view symbols correctly, I.E. 4.0 or above is highly recommended.)
Optical
Properties:
| Transmitting
Range: |
350nm ~ 4500nm
|
| Phase
Matching Range: |
984nm ~ 3400nm
|
| Refractive
Indices: |
@1064nm |
1.7377(nx)
|
1.7453(ny)
|
1.8297(nz)
|
| @532nm |
1.7780(nx)
|
1.7886(ny)
|
1.8887(nz)
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| Sellmeier
Equations: (l in µm) |
Nx2
= 3.0065 + 0.03901 / (l2
- 0.04251) - 0.01327l2
|
|
Ny2
= 3.0333 + 0.04154 / (l2
- 0.04547) - 0.01408l2
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|
Nz2
= 3.3134 + 0.05694 / (l2
- 0.05658) - 0.01682l2
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| Therm-Optic
Coefficient:(10-5/°C) |
dnx/dT=1.1
|
dny/dT=1.3
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dnz/dT=1.6
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| Absorption
Coefficient: |
a<1%/cm @1064nm
and 532nm
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| Nonlinear
Optical Coefficients and Equation: |
@1064nm |
d31=2.54pm/V
|
d32=4.35pm/V
|
d33=16.9pm/V
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|
d24=3.64pm/V
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d15=1.91pm/V
|
|
|
deff(II)=(d24-
d15)sin2f sin2q
- (d15sin2f +d24cos2q
)sinq
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| Electro-optic
coefficients: |
Low Frequency(pm/V)
|
High Frequency(pm/V)
|
| r13 |
9.5 |
8.8 |
| r23 |
15.7 |
13.8 |
| r33 |
36.3 |
35.0 |
| r51 |
7.3 |
6.9 |
| r42 |
9.3 |
8.8 |
| Dielectric
constant: |
eeff=13
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Physical
Properties:
| Crystal
Structure: |
Orthorhombic,
opint group mm2 |
| Cell
Parameters: |
a=6.404Å,
b=10.616Å, c=12.814Å, z=8.00Å |
| Melting
Point: |
1172°C |
| Curie
Point: |
936°C |
| Mohs
Hardness: |
»5 |
| Density: |
3.01g/cm3 |
| Color: |
Colorless |
| Hygroscopic
Susceptibility |
no |
| Specific
Heat: |
0.1643cal/g°C |
| Thermal
Conductivity: |
0.13
W/cm·K |
| Electrical
Conductivity: |
3.5x10-8
s/cm (c-axis, 22°C, 1KHz) |
Applications:
Frequency
Conversion:
KTP
was first introduced as the NLO crystal for Nd doped laser systems
with high conversion efficiency. Under certain conditions, the conversion
efficiency was reported to 80%, which leaves other NLO crystals
far behind it.
Recently,
with the development of laser diodes, KTP is widely used as SHG
devices in diode pumped Nd:YVO4 solid laser
systems to output green laser, and make the laser system very compact.
KTP
for OPA, OPO Applications:
In
addition to be widely used as frequency doubling devices in Nd-doped
laser systems for Green/Red output, KTP is also one of the most
important crystals in parametric sources for tunable output from
visible (600nm) to mid-IR (4500nm) due to the popularity of its
pumped sources, the fundamental and second harmonic of a Nd:YAG
or Nd:YLF lasers.
One
of the most useful applications is the non-critical phase-matched
(NCPM) KTP OPO/OPA pumped by the tunable lasers to obtain the high
conversion efficiency.
KTP
OPO results in stable continuous outputs of femto-second pulse of
108 Hz repetition rate and milli-watt average power levels in both
signal and idler outputs.
Pumped
by Nd-doped lasers, KTP OPO has obtained above 66% conversion efficiency
for degenerate conversion from 1060nm to 2120nm. The following two
tables show the phase-matching angles and effective NLO coefficient
for OPO/OPA pumped at 1064nm and 532nm in XZ plane.
Electro-Optical
modulators:
KTP
crystal can be used as electro-optical modulators. More information,
please contact our sales engineers.
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