Newlight's
KTA features
|
 Large
nonlinear optical coefficients |
|
Wide angular bandwidth and
small walk-off angle
|
|
Broad
temperature and spectral bandwidth |
|
Large electro-optic
coefficients |
|
Lower
absorption in the 3-4 μm range than KTP. |
|
Nonhydroscopic,
chemically and mechanically stable |
|
High thermal conductivity
|
|
High damage threshold |
KTA
is a positive biaxial crystal, with the principal axes X, Y, and Z ( nz>ny>nx
) parallel to the crystallographic axes a, b, and c, respectively.
Structural and
Physical Properties
|
Crystal
Structure |
Orthorhombic, space group Pna21, point group mm2 |
|
Cell
Parameters |
a=13.125Å, b=6.5716Å, c=10.786 Å,
Z=8
|
|
Melting
Point |
1130oC
|
|
Curie
Point |
880oC |
|
Mohs
Hardness |
~ 5
|
|
Density |
3.45 g/cm3
|
|
Color |
colorless
|
|
Hygroscopic
Susceptibility
|
No |
|
Specific
Heat |
0.687 J/g/K |
|
Thermal
Conductivity |
1.8 W/m/K
|
|
Electrical
Conductivity
|
0.7-3.4
x10-6 s/cm (c-axis,
@22 oC, 1KHz)
|
Linear
Optical Properties:
|
Transmitting
Range |
350 nm - 5000 nm |
|
Refractive
Indices:
1064nm
532nm |
nx ny nz
1.7818 1.7866 1.8680
1.8264 1.8331 1.9310 |
|
Sellmeier Equations
(λ
in
μm) |
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 |
|
Thermo-optic
Coefficients
|
dnx/dT=1.1x10-5/oC, dny/dT=1.3x10-5/oC
dnz/dT=1.6x10-5/oC
|
|
Absorption
Coefficient |
α < 1% cm-1 @1064nm and
532nm |
Nonlinear Optical
Properties:
|
Phasematchable SHG Range |
542 - 1800nm |
|
Nonlinear Optical Coefficients |
d31=2.8pm/v,
d32=4.2pm/v,
d33=16.2pm/v,d24=3.2pm/v,
d15=2.3pm/v
|
|
Effective Nonlinearity Expressions
|
deff(II)=
(d24-d15)sin2φsin2θ-(d15sin2φ+d24cos2φ)sinθ |
|
Electro-optic Coefficients
( Low frequency ) |
γ13=
11.5pm/V, γ23=15.4pm/V,
γ33=37.5pm/V |
|
Dielectric Constant |
εeff=42
|
NCPM Tuning
Curve for 1064nm pumped OPO/OPA
With its excellent transmission at the MIR and the possibility to achieve
NCPM when pumped with the common Nd lasers at ~ 1
μm, KTA is the crystal of choice for the
effective generation of 3-5um through OPO/OPA. The NCPM OPO/A can be
temperature tuned by placing an x-cut crystal in
an oven. The tuning curve is as
follows,
|
