KTF – Potassium Terbium Fluoride
| Comparison of Properties | ||
|---|---|---|
| Composition | TGG Tb3Ga5O12 |
KTF KTb3F10 |
| Crystal structure | cubic | cubic |
| Transparency range (rad/Tm) | 400 - 1500nm | 400 - 1500nm |
| Verdet constant, 1064nm (rad/T•m) | 39 | 36 |
| Refractive index at 1064nm | 1.944 | ~1.5 (in process) |
| Density (g/cc) | 7.2 | 5.86 |
| Absorption at 1064nm | ~0.16%/cm | ~0.02%/cm |
| Thermo-optic coefficient (dn/dT) | ||
| 17.9x10-6K-1 | ~1x10-6/K | |
| Nonlinear refractive index | ~2x10-19m2/W | ~1x10-20m2/W |
| Thermal conductivity (W/m•K) |
7.4 | 1.67 |
| Thermal expansion x 10-6°C-1 |
7.3 | 13.7 |
| KTF - General Specifications | |
|---|---|
| Crystal axis orientation: | <100> standard <111> available |
| Diameter Tolerance: | +0.000" / -0.002" |
| Chamfer: | 0.005" ± 0.003" @ 45° |
| Barrel Finish: | 55μinches |
| Perpendicularity: | within 10arc minutes |
| Parallelism: | 60arc-seconds or less |
| Rod End Face Flatness: | within λ/10 wave at 633 nm wavelength |
| Surface Quality: | 10-5 |
| Wave Front Distortion: | less than 1/4 wave per inch of length (measured at 633nm) |
| Standard Coating: | Anti-Reflection with R < 0.25% |
| Data Sheet |
For more information contact the Sales Team:
E-mail | (704) 588-2340
TGG (Terbium Gallium Garnet)
| Applications | |
|---|---|
| Faraday Rotators and Isolators | |
| Advantages | |
| TGG has twice the Verdet constant of a terbium-doped glass. | |
| Thermal conductivity is an order of magnitude greater than typical glass. |
|
| Optical losses are lower for TGG than Tb-doped glasses. | |
| Material Properties | |
| Formula: | Tb3Ga5O12 |
| Crystal Structure: |
[111] |
| Extinction Ratio (over 2/3 clear aperture): | 30 dB |
| Verdet Constant (632nm): | -134RadT-1m-1 |
| Verdet Constant (1064nm): | -40RadT-1m-1 |
| Thermal Conductivity: | 7.4Wm-1K-1 |
| Refractive Index: | 1.95 |
| Nonlinear Index, n2: |
8.0 |
| Figure of Merit, V/a: | 27 |
| Figure of Merit, V/n2: |
5 |
| Verdet Constant |
| Data Sheet |