KTP(Potassium Titanium Oxide Phosphate) has large NLO coefficient, broad acceptance of angular, spectrum and temperature, small walk-off angle, is commonly used crystal for frequency doubling and OPO. KTA(Potassium Titanyle Arsenate) features better NLO coefficients, significantly smaller absorption in the 2-5µm spectral range, low dielectric constants, low ionic conductivities, result in higher damage threshold than KTP. LNG Optics offers single domain elements of both the crystals.
Features & Standard Specifications from LNG Optics:
Dimensions: Up to 25x25mm2 ±0.1mm
Length: Up to 60mm +0.2/-0.1mm
Orientation accuracy:△θ<0.2°,△φ<0.2°
Flatness: λ/10 @ 633nm
Transmitted Wavefront Distortion: λ/4 @ 633nm
Surface Quality: 10/5 Scratch/Dig
Clear Aperture: 90% central area
Parallelism: 20 arc second
Perpendicularity: 10 arc minutes
Chamfer: 0.2mm x 45±5°
AR Coatings: R<0.2% for 1064+532nm or 1064+1570nm
|
Physical and Chemical Properties: |
KTP (KTiOPO4) |
KTA (KTiOAsO4) |
|
Crystal Structure |
Orthorhombic, Space group Pna21, Point group mm2 |
|
|
Lattice Parameters (Å) |
a=6.404, b=10.615, c=12.814, Z=8 |
a=13.125, b=6.5716, c=10.786 |
|
Melting Point (oC) |
1172 |
1130 |
|
Mohs Hardness |
5 |
5 |
|
Density (gram/cm3) |
3.01 |
3.454 |
|
Hygroscopic Susceptibility |
no |
no |
|
Thermal Conductivity (W/m/K) |
13 |
K1=1.8, K2=1.9, K3=2.1 |
|
Thermal Expansion Coefficients (10-6/K) |
αx=11, αy=9, αz=0.6 |
αx=8.7, αy=10.5, αz=-0.2 |
|
Dielectric Constant |
εeff = 13 |
εeff = 42 |
|
Optical and Nonlinear Properties: |
KTP |
KTA |
|
Transparency Range |
350-4500nm |
350-5300nm |
|
SHG Phase Matchable Range |
497-1800nm (Type II) |
1080-3789nm |
|
Thermo-Optics Coefficients (10-6/K) |
dx/dT=11, dny/dT=13, dnz/dT=16 |
Same as KTP |
|
Sellmeier Equations (λ in μm) |
nx2=3.0065+0.03901/(λ2-0.04251)-0.01327λ2 |
nx2 = 1.90713 + 1.23522λ2/(λ2-0.19692)-0.01025λ2 ny2 = 2.15912+1.00099λ2/(λ2-0.21844)-0.01096λ2 nz2 = 2.14768+1.29559λ2/(λ2-0.22719)-0.01436λ2 |
|
Non-Vanished NLO susceptibilities (pm/V) |
d31=6.5, d32=5, d33=13.7 d15=6.1, d24=7.6 |
d31=2.76, d32=4.74, d33=18.5 d15=2.3, d24=3.2 |
|
Effective NLO Coefficient |
deff(II)≈(d24-d15)sin2φsin2θ-(d15sin2φ+d24cos2φ)sinθ |
Same as KTP |