声光可调滤波器 (AOTF) | 瑆创光学电子商店

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Products / 光电器件 /声光器件 /声光可调滤波器 (AOTF) /

声光可调滤波器 (AOTF)

Overview Specification RF Driver Theory Q&A Order Now!

Acousto-optic Tunable Filters

A device used to rapidly and dynamically select specific wavelengths from a wideband laser

Acousto-optic tunable filter (AOTF) is a kind of solid-state, electronically addressed, and random-access optical passband filter. It can be used to quickly and dynamically select specific wavelengths from wideband or multiline sources. Diffraction occurs when specific matching conditions are met between acoustic beams and beams. Thus, it becomes possible to electronically control filter parameters such as wavelength, modulation depth, and even bandwidth to provide fast (usually US), dynamic, random access optical filtering.

According to the existing material characteristics, SIMTRUM offers 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 lights with different deflection directions will be obtained, which can be easily used by users and fiber coupling can be carried out according to needs.

For best performance, we recommend matched RF drivers, including digital frequency synthesizer (DFS) driver technology and random-access wavelength control.

Product Brochure Link:

Related ltems：

Fiber-Coupled AOM

Free-Space Modulators

Applications of AOTF

Spectral Analysis: AOTF is applicable in spectrophotometers for swiftly tuning the wavelength of the light source to measure and analyze various spectral components.
Multi-wavelength Imaging: AOTF enables rapid switching between different wavelengths of light in a multi-wavelength imaging system, facilitating the acquisition of images across different bands for applications such as environmental monitoring and medical imaging.
Communication System: In optical fiber communication, AOTF can be utilized for wavelength division multiplexing and demultiplexing to enhance system bandwidth and efficiency.

Main Product package list

AOTF
RF Driver (Optional)

Product General specifications

General Specifications
Interaction Material	Tellurium Dioxide
Acoustic Mode	Shear / Off Axis
Operating Wavelength	400-700nm 400-1000nm 640-1100 nm
Polarization	Incident Beam: Linear, horizontal to base Diffraction Beam: Linear, vertical to base 0 Order Beam: Linear, horizontal to base
Transmission	> 95%
Active Aperture	2.0 ~ 2.5 mm (Customizable)
Resolution	≤ 5 ~ 10 nm
Center Frequency (Fc)	45 ~ 200 MHz
Diffraction Efficiency @RB	> 70%
RF Power	2 ~ 3 W (Max)
Input Impedance	50Ω Nominal
VSWR @Fc	< 3.5:1
RF Connector	SMA-F
Cooling	Conduction-cooled
Shell Material	Aluminium alloy 6063
RF Driver	Every AOTF has an diver (Refer to driver guide)

Model selection guide

Product Code	Wavelength	Active Aperture	Resolution	Diffraction Efficiency	Optical Material
STTF0001-TS020-640_1100	640-1100 nm	2.0 mm	≤ 10 nm	＞ 70%	Tellurium dioxide
STTF0002-TS020-400_700	400-700 nm	2.0 mm	≤ 5 nm	＞ 70%	Tellurium dioxide
STTF2001-TS025-400_1000	400-1000 nm	2.5 mm	≤ 10 nm	＞ 40%	Tellurium dioxide

AOTF Customization Options

(Currently we can only support standard parts, due to production limitation , We can only customize Aperture size , or customer with quantity orders .If you have any customization requirement，please email to info@simtrum.com.

Product Size and Appearance Labelling

RF Driver can generate RF signals and control the switch, frequency, power, etc. of the RF signal through external modulation signals. By modulating the RF signal, modulation of the laser ON/OFF, laser power, beam deflection, and other modulation can be achieved. There are various options for RF driver, such as fixed frequency or tunable bandwidth, with RF frequency mainly ranging from 20MHz to 250MHz.

RF power ranging from 1W to 150W, trigger frequency ranging from 1Hz to 1MHz, load of 50ohm, available for digital and analog modulation, 24VDC power supply.

SIMTRUM has a professional R & D and production team, the whole process of product independent production, can be customized according to customer needs.

Our driver support both Digital and Analog single, We are able to provide a range of RF driver based on Frequency, Output power and DC input. below are our driver general specification Range, the cost of RF drive was mainly determined by output power.

< 20W : Estimate cost ~1100USD
>20-100W : Estimate cost ~1600USD
>100W : Estimate cost ~2000USD

General Specification for RF driver
RF frequency	27.12Mhz -300MHz
Output power	1W-150W
DC Power Input	12Vdc or 15Vdc or 24Vdc
Cooling	Conduction cooling/ Water Cooling
Operating Model	Support Both Digital & Analog
Rise-time（10%-90%）	20-50ns
Fall-time（90%-10%）	20-50ns
Trigger frequency	100kHz
Trigger delay	50ns
Output impedance	50Ω

Water Cooled RF driver

Conduction cooled RF driver

Fin Cooled RF driver

RF Driver Control logic

The Basic Composition of AOTF

1.Acoustooptic medium: usually transparent crystalline materials, such as Quartz, rubidium aluminum phosphate (RbTiOPO4), Silicon, etc.

2.Transducers: Piezoelectric crystals (such as barium titanate) convert electrical signals into ultrasonic waves.

3.Drive electronics: Provides an adjustable RF signal to drive the transducer.

Working Principle

1.Sound waves travel through a medium:

When the transducer receives the RF signal from the driving electronics, it generates ultrasonic waves.

The ultrasonic wave propagates in the acousto-optic medium, which causes the refractive index of the medium to change periodically, forming a structure similar to the grating.

2.Diffraction of light:

When the incident light passes through the acousto-optic medium, it is affected by the periodic refractive index change caused by the sound wave.

This change will cause the incident light to diffract, divided into multiple diffraction orders (such as 0, 1, etc.).

3.Wavelength selection:

By changing the frequency of the RF signal, the wavelength and frequency of the sound wave will also change, thus changing the period of the grating formed.

Because the diffraction Angle and diffraction efficiency of light are related to the grating period, different wavelengths of light diffract at different angles.

By precisely controlling the frequency of the RF signal, it is possible to selectively diffract and transmit specific wavelengths of light.

4.Beam separation:

The diffracted light of a particular wavelength can be separated by an appropriate optical element (such as a prism or lens), and the undiffracted light continues to travel along its original path.

AOTF Calculation Formula:

The acousto-optical interaction can be described in terms of the Bragg diffraction condition. By adjusting the frequency of the RF signal, Λ can be altered, thereby enabling selective tuning of λ.

Λ represents the wavelength of the sound wave
θ denotes the angle between incident light and diffracted light
m signifies the diffraction order
λ refers to the wavelength of light

Q:Can the AOTF handle a maximal power (~300 mW for a single laser and ~ 1W when a few lasers are turning on together).

A:Yes, usually the AOTF can handle multiple laser turn on together with a high power

Q: What is the input and output of AOTF fiber coupler head？

A: currently our AOTF only support free Space Input and output.

Q:What is the difference between AOM and AOTF？

Characteristics	AOM (Acousto-Optic Modulator)	AOTF (Acousto-Optic Tunable Filter)
Main Function	Light intensity, frequency, and phase modulation	Wavelength selection and tuning
Working Principle	Modulating the light beam through the diffraction grating formed by sound waves	Selecting specific wavelengths of light through the diffraction grating formed by sound waves
Application	Laser modulation, frequency shifting, optical switching, pulse modulation	Spectral analysis, multi-wavelength imaging, wavelength selection in optical communication
Structural Complexity	Relatively simple	More complex, more precise design

Q:What are the main factors affecting the wavelength range of AOTF?

A:Sound velocity of an acousto-optic medium

Quartz based AOTF: can cover a wavelength range of about 200 nm-4 µm.
Rubidium aluminophosphate based AOTF: covers a wavelength range of about 350 nm-5 µm.

Design of transducer and drive circuit

Transducer efficiency: Efficient transducers are better able to convert electrical signals into sound waves, allowing for a wider range of wavelength selection.
Driver circuit: The design of the driver circuit determines the frequency range and power of the applied RF signal, which affects the tuning range of the AOTF.

Sales Guide

If you need our technical team for guidance on product selection or customization, please help to provide below technical information, it helps to speed up the process.

Items	Detail	Unit	Remark
AOTF Technical Sales Guide ( Let us know your desired product spec.)
Application
Operating Wavelength range		nm
Spectral resolution		mrad
Active Aperture		mm
AOM RF driver sales Guide
Trigger Frequency		Hz
DC Power Supply		V
Customer Laser feature (you can also let us know your input laser spec.)
Output Mode		/
Wavelength		nm
Beam Diameter		mm	if Free space
Fiber Type and Size		/	if Fiber coupled
Average Laser Power		W
Laser Repetition Rate		Hz	if Pulsed
Pulse Energy		mJ	if Pulsed
Pulse Duration		ns	if Pulsed
Polarization		/

AOTF Customization Options

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Drop us an email at info@simtrum.com to get the Best Price today.		Want more technical information? Click Here for the professional Customized System/ Solutions.


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	Availability	Reference Price (USD)
STTF0001-TS020-640_1100 Acousto-Optic Tunable Filter (AOTF), wavelength 640-1100nm, active aperture 2.0mm, resolution ≤10nm, diffraction efficiency >70%, optical material Tellurium dioxide, provide AOM-matched RF driver	6 -8 Weeks	$5577.00
STTF0002-TS020-400_700 Acousto-Optic Tunable Filter (AOTF), wavelength 400-700nm, active aperture 2.0mm, resolution ≤5nm, diffraction efficiency >70%, optical material Tellurium dioxide, provide AOM-matched RF driver	6 -8 Weeks	$5577.00
STTF2001-TS025-400_1000 Acousto-Optic Tunable Filter (AOTF), wavelength 400-1000nm, active aperture 2.5mm, resolution ≤10nm, diffraction efficiency >40%, optical material Tellurium dioxide, provide AOM-matched RF driver	6 -8 Weeks	$5577.00

RF driver ＞100W - Parameter

RF driver ＞20W -100W - Parameter

RF driver < 20W - Parameter

STTF2001-TS025-400_1000 - Parameter

STTF0002-TS020-400_700 - Parameter

STTF0001-TS020-640_1100 - Parameter

RF driver ＞100W - Download

RF driver ＞20W -100W - Download

RF driver < 20W - Download

STTF2001-TS025-400_1000 - Download

STTF0002-TS020-400_700 - Download

STTF0001-TS020-640_1100 - Download

Accessories

	Availability	Reference Price (USD)
RF driver < 20W RF driver RF frequency 27.12Mhz -300MHz ,Output power 1W-150W,DC Power Input 12Vdc or 15Vdc or 24Vdc,Cooling Conduction cooling/ Water Cooling	6 - 8 Weeks	$930.00
RF driver ＞20W -100W RF driver RF frequency 27.12Mhz -300MHz ,Output power 1W-150W,DC Power Input 12Vdc or 15Vdc or 24Vdc,Cooling Conduction cooling/ Water Cooling	6 - 8 Weeks	$1487.00
RF driver ＞100W RF driver RF frequency 27.12Mhz -300MHz ,Output power 1W-150W,DC Power Input 12Vdc or 15Vdc or 24Vdc,Cooling Conduction cooling/ Water Cooling	6 - 8 Weeks	$1859.00