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Polychromatic modulators & Associated RF drivers

Polychromatic modulator AOTFnC with Multi channels driver based on DDS

The AOTFnC is a special acousto-optic tunable filter called Polychromatic Modulator, which uses the anisotropic interaction inside a tellurium dioxide crystal 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 (1-2nm), 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 (<0.2mrd ) make this AOTF a powerful tool for free space or fiber pigtailed applications. Its associated thermal stabilisation maintains stable diffraction efficiency and reduces dramatically beam drift with single mode fibre pigtailing. This is a major advantage for high sensitivity applications.
AOTFnC* HR7 MR7 LR7 VIS CPCh IR
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