### Lasers & Photonics

Schematic of Faraday effect

Schematic of setup

Schematic of front panel of main unit

## LEOI-32A Apparatus of Optical Rotation and Faraday Effect

Features

• Large Verdet constant with rotation ≥15° (at current of 3 A)

• Precise measurement

• Stable base for easy operation

• Magneto-optic modulation technique demo

Introduction

The magneto-optic rotation effect of a crystal, also called the Faraday effect, describes the effect of polarization rotation of an optical beam going through a layer of magneto-optic material. It plays an important role in optical experiments. This experimental system is designed to

1. Observe the magneto-optic rotation effect of a material under test

2. Understand the flow direction of a magnetic current vs the polarization rotation direction of a Faraday rotator

3. Calculate the Verdet constant

4. Demonstrate optical communication using magneto-optic modulation technique

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

1. Observe Faraday effect

2. Acquire relationship between magnetization current and polarization rotation angle

3. Observe current direction vs polarization rotation direction

4. Calculate the Verdet constant of material under test

5. Demonstrate optical communication using magneto-optic modulation technique

6. Verify Malus's law

Parts and Specifications

 Description Specifications Qty Optical rail length: 0.8 m 1 Diode laser 4 mW at 650 nm with 2-D adjustable holder 1 Polarizer incl holder 2 Coil inner diameter: 10 mmouter diameter: 110 mmnumber of turns: 1600length: 50 mm 1 Laser power meter with probe 3-1/2 digitsscale: 200 μW, 2 mW, 20 mW, 200 mWresolution: 0.1 μW 1 Main unit 0~3 A adjustable with built-in speaker 1 Teslameter range: 0 - 2000 mT 1 Sample Φ6 mm; length: 30 mm 1 Audio signal source MP3 1 Slide 5 Photo detector incl 2-D adjustable holder, ± 2.5 mm 1 Power cord 1 Instruction manual 1

Schematic of Faraday effect

Schematic of setup

Schematic of front panel of main unit