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Acousto-optic Tunable Filter
Application:
Quantum electronics, spectroscopy,spectral polarization,fluorescencespectroscopy,HYPERspectralimaging, laser wavelength tuning,wavelength selection, opticalcommunication.
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According to the existing material characteristics, ModuOptik designed AOTF products based on TeO2 shear wave acoustic mode. The wavelength range covers 350-2500 nm. Optimum performance is achieved in each wavelength range and meets most applications: resolution as low as 1 nm, FOV Angle up to 20 degrees, and aperture up to 10 mm. In most cases, the filtering output of AOTF is collinear. After the randomly deflected input light passes through AOTF, two horizontally polarized or vertically polarized light with different deflection directions will be obtained, which can be easily used by users and fiber coupling can be carried out according to needs.
Product Code
(Download specification)Working wavelength (nm) Active Aperture(mm) Resolution Diffraction Eficiency Optical Material TF1001-TS020-640_1100 640-1100 2 ≤10nm >70% Tellurium dioxide TF1002-TS030-650_1000 650-1000 3 ≤5nm >70% Tellurium dioxide TF1003-TS030-650_1000 650-1000 3 ≤10nm >70% Tellurium dioxide TF2001-TS025-400_1000 400-1000 2.5 ≤10nm >40% Tellurium dioxide Acousto-optic tunable filters (AOTFs) represent a sophisticated solution for real-time spectral selection and manipulation across various optical applications. These solid-state devices leverage the interaction between acoustic waves and light waves within anisotropic crystals like tellurium dioxide (TeO₂) or quartz to achieve rapid wavelength tuning. When an RF signal excites the transducer bonded to the crystal, it generates acoustic waves that create a periodic refractive index modulation. This acts as a dynamic diffraction grating, selectively diffracting a narrow wavelength band from the incident polychromatic light while rejecting others. The center wavelength of this bandpass can be instantaneously adjusted by simply changing the applied RF frequency, typically covering ranges from ultraviolet to mid-infrared (200nm-5μm) depending on crystal material and design.
The tuning mechanism of AOTFs provides exceptional agility, with wavelength switching speeds as fast as 10 microseconds – orders of magnitude quicker than conventional filter wheels or monochromators. This enables unprecedented capabilities in hyperspectral imaging systems where rapid spectral scanning across hundreds of channels is required. Modern AOTFs achieve spectral resolutions (Δλ/λ) ranging from 0.1% to 1%, with high-end models offering sub-nanometer resolution in visible wavelengths. The diffracted light undergoes a polarization shift, allowing AOTFs to function as both spectral and polarization filters simultaneously. This unique property proves invaluable in applications like Raman spectroscopy where polarization information carries critical molecular structure details.
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