Physics Lab Equipment

LEOI-33A Experimental System for Acousto-Optic Effect

LEOI-33A Experimental System for Acousto-Optic Effect

Note: oscilloscope not included


  • Easy operation

  • Precise measurement

  • CCD option

  • Complete solution


Acousto-optic effect is based on the change in the refractive index of a medium due to the presence of sound waves in the medium. This creates a refractive index grating in the material that can be used to diffract light. It provides a powerful means to the control of the frequency, direction, and intensity of a laser beam. Employing acousto-optic effect, acousto-optic devices such as acousto-optic modulator, acousto-optic deflector, and tunable acousto-optic filter have been applied significantly to areas such as laser technology, optical signal processing, and integrated optical communication.


This experimental system consists of an acousto-optic modulator, a diode laser, a signal generator, a photo-receiving device, and an optical bench with carriers. There are two options of the photo-receiving device, i.e. a photo-cell with amplifier (option 1) for manual data acquisition, a CCD (option 2) for real-time data display on an oscilloscope.


This experimental system can be used to conduct the following experiments:


1. Compare Raman-Nath diffraction with Bragg diffraction.

2. Measure acousto-optic deflection in terms of diffraction angle versus ultrasound frequency.

3. Measure intensity of zero order and 1st order light versus ultrasound power.

4. Measure bandwidth and central frequency of acousto-optic device.

5. Measure diffraction efficiency of acousto-optic device.

6. Measure traveling velocity of ultrasound wave in acousto-optic device.
7. Simulate optical communication using acousto-optic modulation technique.


Ultrasound Signal SourceFrequency: 80 - 120 MHz adjustable
Output power: max 1 W, adjustable
With modulation input port
Diode Laser>3.0 mW @650 nm
Acousto-Optic DeviceCenter frequency: 100 MHz
Bandwidth: 80 - 120 MHz
Effective aperture: 1 mm
Transmissivity: >96%
Refractive index n = 2.386
Bragg angle: 17.4 mrad
Polarization of input light: any
Optical Bench0.8 m, with 3 carriers
TransmitterWith internal musical signal & external modulation input ports
ReceiverConnected to a photocell, with speaker
Photocell Detector (option 1)With 0.1 mm reading ruler & amplifier, connected to galvanometer
CCD (option 2)pixel number: 2592; size: 11×11 μm; spectral range: 0.3~0.9 μm
with synchronization/signal ports, connected to an oscilloscope

Experimental System for Acousto-Optic Effect.png

Relationship between diffraction efficiency and frequency

Experimental System for Acousto-Optic Effect.png

Diffraction angle versus ultrasound frequency

Experimental System for Acousto-Optic Effect.png

Intensity of zero order and 1st order light versus ultrasound power

LEOI-33A Experimental System-1.jpg

Graph observed on oscilloscope

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