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 7/8/10, 32/64-bit computers


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 optional CCD camera, USB image acquisition box, and analysis software. It is an ideal experimental instrument for advanced physics laboratories.

The instruction 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


ElectromagnetB: ~1300 mT; pole spacing: 8 mm; pole dia: 30 mm: axial aperture: 3 mm
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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