FILTER PRODUCTS
AOTF
Acousto-Optic Tunable Filters (AOTF): Fast, Solid-State Spectral Control for Advanced Optical Systems
Acousto-Optic Tunable Filters (AOTFs) are innovative solid-state devices that provide ultra-fast, precise control over both the wavelength and intensity of light. By utilizing the acousto-optic effect—where sound waves interact with light in a crystal medium—AOTFs offer dynamic, electronically tunable filtering without the need for any mechanical components. These filters have become indispensable in a variety of advanced optical applications.
What Is an AOTF?
An AOTF consists of a transparent crystal paired with a piezoelectric transducer. When radio frequency (RF) signals are applied, the transducer generates acoustic waves within the crystal. These waves modulate the crystal’s refractive index, forming a temporary diffraction grating. By varying the RF frequency, specific wavelengths of light can be diffracted and selected with high accuracy and speed.
The advantages of AOTFs include:
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No moving parts – ensuring long-term reliability and resistance to vibration
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Fast switching times – typically in the microsecond range
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Broad spectral compatibility – covering UV, visible, and infrared regions
Applications of AOTFs
AOTFs are widely used across numerous industries and scientific fields due to their versatility and performance:
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Hyperspectral and Multispectral Imaging: AOTFs enable rapid scanning across wavelengths, making them ideal for applications that require detailed spatial and spectral data.
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Fluorescence Microscopy: Their fast switching capabilities allow real-time control of illumination, crucial for techniques like FRAP, FLIP, and live-cell imaging.
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Spectroscopy: AOTFs serve as electronically tunable monochromators for quick, non-mechanical spectral selection in analytical instruments.
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Remote Sensing and Environmental Monitoring: AOTFs are used in airborne and satellite-based sensors to detect chemical signatures, vegetation health, and water quality.
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Telecommunications and Lidar: In fiber optic networks and lidar systems, AOTFs enable agile wavelength selection and spectral shaping.
Choosing the Right AOTF
When selecting an AOTF, several parameters should be considered:
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Crystal Material: Common materials include TeO₂ and quartz, each optimized for specific spectral ranges and diffraction efficiencies.
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Tuning Range and Resolution: Depending on your application, you may need fine wavelength resolution or broader tuning bandwidths.
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Aperture Size and Beam Compatibility: Ensure the device supports your beam dimensions and divergence characteristics.
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RF Driver Requirements: The performance of an AOTF is closely tied to its RF driver, which controls the tuning and modulation characteristics.
Explore AOTFs on FindLight
FindLight offers a curated selection of Acousto-Optic Tunable Filters from leading manufacturers around the globe. Whether you need a compact module for biomedical imaging or a high-performance unit for spectroscopy, you’ll find a wide range of options including:
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Free-space and fiber-coupled designs
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UV, visible, and infrared wavelength coverage
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High-resolution and broadband models
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Compatible RF driver packages
Browse our catalog to compare specifications and request quotes directly from trusted vendors. Our intuitive filtering tools help you quickly find the right AOTF for your specific system requirements.
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