Physics Lab Equipment

LEAI-22 Integrated Experimental System of Faraday and Zeeman Effects

LEAI-22 Integrated Experimental System of Faraday and Zeeman Effects


  • Transverse and longitudinal Zeeman effects

  • Integrated system for both Faraday and Zeeman effects

  • High accuracy Teslameter included

  • Magneto-optic material of large Verdet constant offers significant Faraday effect

  • Wideband etalon enables oberserving Zeeman effects at other Hg spectral lines

  • Optional CCD camera with analysis software for Windows 10/11


This LEAI-22 experimental system of Faraday and Zeeman effects consists of a main controller unit (including Teslameter, optical power meter, etc.), an electromagnet with a rotation stage, a diode laser, a pencil Mercury lamp, focusing/imaging lenses, an interference optical filter, a F-P etalon, a polarizer, a photodetector, a direct reading microscope with an optional CCD camera, a USB image acquisition box, and analysis software. It is an ideal experimental instrument for advanced physics laboratories.

The instructional manual contains comprehensive materials including experimental configurations, principles and step-by-step instructions. Please click Experiment Theory and Contents to find more information about this apparatus.


Using this instrument, the following experiments can be conducted:


1. Observe Zeeman effect, and understand atomic magnetic moment and spatial quantization

2. Observe the splitting and the polarization of a Mercury atomic spectral line at 546.1 nm

3. Calculate electron charge/mass ratio based on Zeeman splitting amount

4. Observe Zeeman effect at other Mercury spectral lines (e.g. 577 nm, 436 nm & 404 nm) with optional filters

5. Learn how to adjust a Fabry-Perot etalon and apply a CCD device in spectroscopy

6. Measure magnetic field intensity using a Teslameter, and determine magnetic field distribution

7. Observe Faraday effect, and measure Verdet constant using light extinction method



B: ~1300 mT; pole spacing: 8 mm; pole dia: 30 mm: axial aperture: 3 mm; number of turns per coil: 2100

Power supply5 A/30 V (max)
Diode laser> 2.5 mW@650 nm; linearly polarized
Etalondia: 40 mm; L (air)= 2 mm; passband:>100 nm; R=95%; flatness:< λ/30
Teslameterrange: 0-1999 mT; resolution: 1 mT
Pencil mercury lampemitter diameter: 6.5 mm; power: 3 W
Interference optical filterCWL: 546.1 nm; half passband: 8 nm; aperture: 20 mm
Direct reading microscopemagnification: 20 X; range: 8 mm; resolution: 0.01 mm
Lensescollimating: dia 34 mm; imaging: dia 30 mm, f=157 mm

Parts List

Main Unit1
Diode Laser with Power Supply1 set
Magneto-Optic Material Sample1
Pencil Mercury Lamp1
Mercury Lamp Adjustment Arm1
Milli-Teslameter Probe1
Mechanical Rail1
Carrier Slide6
Power Supply of Electromagnet1
Condensing Lens with Mount1
Interference Filter at 546 nm1
F-P Etalon1
Polarizer with Scale Disk1
Quarter-Wave Plate with Mount1
Imaging Lens with Mount1
Direct Reading Microscope1
Photo Detector1
Power Cord3
CCD, USB Interface & Software1 set (option 1)
Interference filters with mount at 577 & 435 nm1 set (option 2)

    Zeeman Effect Apparatus.png

Schematic of transverse Zeeman effect

1. Magnet                    2. Mercury lamp

3. Condensing lens    4. Filter 

5. F-P etalon                6. Polarizer 

7. Imaging lens           8. Microscope

LEAI-22-546-no.jpg   LEAI-22-546.jpg

Fringes before (left) and after (right) applying magnetic field at 546 nm

   LEAI-22-Diode laser.jpg

Setup for Faraday effect


Setup for longitudinal Zeeman effect

LEAI-22-436-no.jpg   LEAI-22-577-no.jpg

LEAI-22-436.jpg   LEAI-22-577.jpg

Before and after applying magnetic field at 436 nm (left) and 577 nm (right)

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