KTA is an excellent nonlinear optical
crystal for Optical Parametric Oscillation (OPO) Application.
Comparing with KTP, KTA features better nonlinear optical
and electro-optical coefficients, significantly smaller
absorption in the 2.0-5.0¦Ìm spectral range, low dielectric
constants, low ionic conductivities, result in higher damage
threshold than KTP.
Physical and Chemical
Properties:
| Crystal Structure |
Orthorhombic,
point group mm2 |
| Lattice Parameters (Å) |
a=13.125, b=6.5716, c=10.786 |
| Melting Point (oC) |
~ 1130 |
| Mohs Hardness |
~ 5 |
| Density (gram/cm3) |
3.454 |
| Hygroscopic Susceptibility |
no |
| Thermal Conductivity (W/m/K) |
K1= 1.8, K2= 1.9, K3= 2.1 |
| Thermal Expansion Coefficients (K-1) |
1130¡À5¡ãC |
| Ferroelectric Transition Temperature (¡ãC) |
¦Áx= 8.7 x 10-6,
¦Áy= 10.5 x 10-6, ¦Áz= -0.2
x 10-6 |
| Electrical Conductivity |
0.7-3.4 x10-6s/cm
(c-axis, 22oC, 2KHz) |
| Dielectric Constant |
¦Åeff= 42 |
Optical and Nonlinear Properties:
| Transparency Range |
350-5300nm |
| Phase Matching Range (SHG) |
1080-3789nm |
| Electro-Optic Coefficients (pm/V) |
r13=
11.5, r23= 15.4, r33= 37.5 |
| Thermo-Optics Coefficients (oC-1) |
dnx/dT=1.1x10-5,
dny/dT=1.3x10-5, dnz/dT=1.6x10-5 |
| Sellmeier Equations (¦Ë in ¦Ìm) |
n x2
= 1.90713 + 1.23522¦Ë 2/(¦Ë 2-0.19692)-0.01025¦Ë 2
ny2= 2.15912+1.00099¦Ë2/(¦Ë2-0.21844)-0.01096¦Ë2
nz2= 2.14768+1.29559¦Ë2/(¦Ë2-0.22719)-0.01436¦Ë2 |
| Effective Nonlinear Optical Coefficients |
deff(ll)¡Ö(d24-d15)sin2¦Õsin2¦È
-(d15sin2¦Õ+d24cos2¦Õ)sin¦È |
Main Applications:
- Harmonic Generation for 1080-3789nm
- Sum and Difference Frequency Generation (SFG and DFG)
- Optical Parametric Oscillation (OPO)
- Electro-Optical Q-switch and modulation
OSICO Specifications:
| Apertures |
Up to 10x10mm2 |
| Length |
Up to 30mm |
| Dimension Tolerance |
(W¡À0.1mm) x (H¡À0.1mm) x (L+0.2/-0.1mm) |
| Phase Matching Angle Tolerance |
¦¤¦È < 0.25° , ¦¤¦Õ < 0.25° |
| Flatness |
¦Ë/10 @ 633nm |
| Transmitted Wavefront Distortion |
< ¦Ë/8 @ 633nm |
| Surface Quality |
10/5 scratch/dig |
| Parallelism |
< 20 arc second |
| Perpendicularity |
< 5 arc minutes |
| Parallelism |
< 20 arc second |
| Perpendicularity |
< 5 arc minutes |
| Clear Aperture |
90% central area |
| Edge Bevel |
0.15mm x 45° ¡À 5° chamfer |
| AR Coatings |
R < 0.2% at both wavelength |
|
