Acousto-Optic Tunable Filters

AMS item number: SW11458

Wavelength 351-4500 nm; Active Aperture 2-12 mm; Bandwidth 0.3-12 nm; Acousto-optic tunable... more

Product information "Acousto-Optic Tunable Filters"

Wavelength 351-4500 nm; Active Aperture 2-12 mm; Bandwidth 0.3-12 nm;

Acousto-optic tunable filters (AOTF) are used to rapidly and dynamically select a specific wavelength from a broadband or multi-line laser source. As the applied RF frequency is varied, the transmitted wavelength changes, “tuning” the wavelength of the beam or image in tens of microseconds or less.

An extensive line of AO tunable filters is available for wavelength from the UV through mid-IR, with resolution bandwidths of less than 1nm, with options such as large-aperture imaging filtering and sideband suppression. Fiber-coupled acousto-optic tunable filters devices are available upon request.

AOTFs with apertures less than 6 mm are typically used that have less than tens of nm of resolution bandwidth at NIR wavelengths and less than ten nm at visible wavelengths. A quasi-collinear AOTF can deliver < 1 nm resolution bandwidth if operated with highly collimated light. AOTFs with larger apertures (> 6 mm) are a powerful tool for spectral imaging, rapidly and efficiently scanning an entire image in wavelength. This is of use in high-speed applications like hyperspectral imaging, confocal microscopy and on-line process control. The cost of AOTFs increases significantly for very large apertures, but they deliver unmatched speed for time-sensitive multispectral measurements in industry and biotech, approaching real-time video rate spectral imaging.

Gooch & Housego’s acousto-optic tunable filters are manufactured using high quality TeO2 crystals grown in-house, polished and fabricated to rigorous standards, with wavelengths from 350 nm to 4.4 µm in a wide variety of apertures and resolution bandwidths. It is possible to filter images up to 25 mm across, meet exceptionally low driver power requirements or design an AOTF to select and transmit multiple discrete wavelengths.

Acousto-optic tunable filters often exhibit light leakage outside the resolution bandwidth of interest, typically at 10-20 dB below peak power. This is due to the response function of the AOTF itself but can be minimized using G&H’s patented techniques. Sideband suppression is available in several models, reducing out of band side lobes by greater than 20 dB relative to the primary beam.

The AOTF product family includes application-specific solutions for illumination or excitation wavelength selection, as well as multispectral or hyperspectral imaging. For best performance, we recommend a matched RF driver, including the latest digital frequency synthesizer (DFS) driver technology and random access wavelength control.

Applications: Confocal Microscopy; Fluorescence Imaging; Hyperspectral Imaging; Imaging Spectroscopy; Laser Wavelength Tuning; On-Line Process Control; Spectroscopy; Wavelength Selection

Series	Wavelength	Active Aperture	Bandwidth	Downloads
AOTF 2837-31	351 - 430 nm	2.5 mm	1.0 nm	Datasheet
TF525-250-6-3-GH19A	400 - 650 nm	3 mm	3 nm	Datasheet
AOTF 3151-01	400 - 650 nm	2.5 mm	2.5 nm	Datasheet
TF550-300-4-6-GH57A AOTF	400 - 700 nm	6 mm	4 nm	Datasheet
TF560-280-1-5-NT2 AOTF	420 - 700 nm	5 mm	0.3 nm	Datasheet
AOTF 2838-01	450 - 670 nm	2.5 mm	1.3 nm	Datasheet
AOTF 2885-02	450 - 670 nm	2.5 mm	2 nm	Datasheet
AOTF 2885-04	450 - 670 nm	2.5 mm	4 nm	Datasheet
TF625-350-2-11-BR1A AOTF	450 - 800 nm	11 x 12 mm	1.5 nm	Datasheet
TF850-500-10-6-GH58A AOTF	600 - 1100 nm	6 mm	10 nm	Datasheet
AOTF 2986-01	640 - 1100 nm	2.5 mm	5 nm	Datasheet
TF950-500-1-2-GH96	700 - 1200 nm	2 mm	0.6 nm
AOTF 2996-01	1100 - 2000 nm	2.5 mm	12 nm	Datasheet	Driver	Driver
I-TF1650-1100-1-3-GH107	1100 - 2200 nm	3 mm	1.0 nm
TF1875-1250-10-6-GH59A	1250 - 2500 nm	6 mm	10 nm	Datasheet
I-TF2250-1500-2-3-GH107	1500 - 3000 nm	3 mm	2 nm
I-TF3250-2500-3-3-GH107	2000 - 4500 nm	3 mm	3 nm

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