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LEOI-33A Experimental System for Crystal Acousto-Optic Effect - Enhanced Model
Category: Optical Experiment System  Publish Time: 2014-07-16 17:05 

LEOI-33A Experimental System for Crystal Acousto-Optic Effect - Enhanced Model
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LEOI-33A
Experimental System for Crystal Acousto-Optic Effect - Enhanced Model


Description
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 three 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, and a CCD with automatic data acquisition for use with a PC (option 3).
Application
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.

Specification

Ultrasound Signal Source

Frequency: 80 - 120 MHz adjustable

Output power: max 1 W, adjustable

With modulation input port

Diode Laser

>3.0 mW @650 nm

Acousto-Optic Device

Center 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 Bench

0.8 m, with 3 carriers

Transmitter

With internal musical signal & external modulation input ports

Receiver

Connected 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

CCD and Data Acquisition (option 3)

USB connected to PC, with application software

Examplies

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