Potassium Titanyl Phosphate (KTiOPO4 or KTP)


Introduction | Main Properties | Main Applications | Fabrication Specs. | Notes



II-A. Basic Properties


Density 3.02 g/cm3
Crystal Structure Orthorhombic, point group mm2
Lattice Parameters a=6.404Å b=10.616Å c=12.814Å Z=8
Mohs Hardness ~ 5
Melting Point 1172oC (Incongruent)
Curie Point 936oC
Specific Heat 0.1643 cal/goC (25oC)
Dielectric Constant eeff = 13
Absorption Coefficient < 0.1%/cm@1.064 mm and < 1%/cm@0.532 mm
Thermal Conductivity 13 W/m/oC
Electrical Conductivity 1.22x10-6s/cm (c-axis, 22oC, 2KHz)
Hygroscopic Susceptibility no



II-B. Optical and NLO Properties


Transparency Region 0.35 mm ~ 4.5 mm
Nonlinear Coefficients
(@1.064 mm)
d31=2.54 pm/V, d32=4.35 pm/V, d33=16.9 pm/V
d24=3.64 pm/V, d15=1.91 pm/V
deff(ll)≈(d24-d15)sin2fsin2q -(d15sin2f+d24cos2f)sinq
(Where q, f are polar angles referring to Z, X axis)
Refractive Indexes
nx ny nz  
1.740 1.746 1.830 (@ 1.064 mm)
1.778 1.789 1.888 (@ 0.532 mm)
Sellmeier Equations
(l in mm)
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/(l2-0.05660)-0.01682l2
Therm-optic Coefficients dnx/dT = 1.1x10-5/ oC, dny/dT = 1.3x 10-5/oC
dnz/dT = 1.6x 10-5/oC
Electro-optic
Coefficients
(pm/V)
  Low frequency High frequency
g13 9.5 8.8
g23 15.7 13.8
g33 36.3 35.0
g51 7.3 6.9
g42 9.3 8.8

Damage Threshold

> 500 MW/ cm2 at 1.064 mm (10 ns, 10 Hz)

> 5 GW/ cm2   at 1.064 mm (20 ps, 100 Hz)

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