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The AOTFnC is a special acousto-optic tunable filter which uses the anisotropic interaction inside a Tellurium dioxide crystal (TeO2) to control independently or simultaneously different lines from an incoming UV or VISIBLE laser light (White laser, Ar+, Kr+, HeNe, DPSS, Dye…).
Up to 8 distinct lines can be mixed and separately modulated in order to generate different colorimetric patterns. The specific crystal cut of the AOTFnC produces good diffraction efficiency (> 90%), narrow resolution (1-2 nm), a low cross-talk between lines, and high extinction ratio.
The large separation angle between 0 and 1st orders, as well as the excellent output chromatic colinearity (<0.2 to <0.3 mrd ) make this AOTF a powerful tool for free space or fibre pigtailed applications. Its associated thermal stabilization maintains stable diffraction efficiency and reduces dramatically beam drift with single mode fibre pigtailing. This is a major advantage for high sensitivity applications.
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| AOTFnC* | HR7 | MR7 | LR7 | VIS | CPCh | IR | Associated RF drivers |
|---|---|---|---|---|---|---|---|
| Number of channels / Lines | 8 | 4 | 2 | 8 | 8 | 1 | |
| Acoustic velocity (nom) | 660 m/s | 660 m/s | 660 m/s | 675 m/s | 640 m/s | ||
| Optical wavelength range | 400-650 nm | 400-650 nm | 400-650 nm | 450-700 nm | 400-650 nm | 700-1000 nm | |
| Transmission | > 90 % | > 90 % | > 90 % | > 95 % | > 90 % | > 95 % | |
| AO interaction type | Birefringent | Birefringent | Birefringent | Birefringent | Birefringent | Birefringent | |
| Selected order | -1 | -1 | -1 | -1 | -1 | 1 | |
| Input Light polarization | Linear orthogonal | Linear orthogonal | Linear orthogonal | Linear orthogonal | Linear orthogonal | Linear parallel | |
| Output Light polarization | Linear parallel | Linear parallel | Linear parallel | Linear parallel | Linear parallel | Linear orthogonal | |
| Drive frequency range | 74-158 MHz | 74-158 MHz | 74-158 MHz | 80-153 MHz | 52-111 MHz | 37-62 MHz | |
| Active aperture | 3 x 3 mm² | 3.5 x 3.5 mm² | 3 x 3 mm² | 3 x 3 mm² | 2.5 x 2.5 mm² | 2.5 x 2.5 mm² | |
| Spectral resolution (FWHM) | nom 1-4 nm | nom 2-8 nm | nom 4-16 nm | < 1.5 nm | nom 1.6-7.6 nm | nom 5-11 nm | |
| Separation angle (orders 0-1) | > 4° | > 4° | > 4° | > 4.6° | > 3° | > 3.5° | |
| Chromatic colinearity (order 1) | < 0,3 mrd | < 0,3 mrd | < 0,3 mrd | < 0,2 mrd | < 0.3 mrd | < 0.2 mrd | |
| Temperature stabilization | TN | TN | TN | TN | TN | TN | |
| AO Efficiency | >=90% /line | >= 90 % /line | >= 90 % /line | >= 90 % /line | >= 90% /line | >= 85% /line | |
| Rise time | 1 µs / mm | 1 µs / mm | 1 µs / mm | 1 µs / mm | 1 µs / mm | 1 µs / mm | |
| Max accepted RF power | < 0.15 W /line | < 0.3 W /line | < 0.5 W /line | < 0.1 W /line | < 0.15 W /line | < 1 W /line | |
| Electrical impedance | 50 Ohms | 50 ohms | 50 ohms | 50 ohms | 50 ohms | 50 ohms | |
| VSWR | < 2/1 | < 2/1 | < 2/1 | < 2/1 | < 2/1 | < 2/1 | |
| Size | 70 x 36,6 x 35,8 mm3 | 70 x 36,6 x 35,8 mm3 | 70 x 36,6 x 35,8 mm3 | 70 x 36,6 x 35,8 mm3 | 70 x 36,6 x 35,8 mm3 | 70 x 36,6 x 35,8 mm3 | |
| Operating temperature | 10 to 40 °C | 10 to 40 °C | 10 to 40 °C | 10 to 40 °C | 10 to 40 °C | 10 to 40 °C |