Physics Lab Equipment

LEAI-19 Apparatus of Optical Pumping

LEAI-19 Apparatus of Optical Pumping

Note: oscilloscope not included


  • Open structure for hands-on learning

  • High accuracy for g-factor measurement

  • Robust system with high-quality components


Optical pumping is an important experiment in modern physics. It reveals many important physics concepts such as atomic energy states and atomic transitions in atomic physics, optics, electromagnetism, and electronics. This technique has a wide range of applications in fundamental physics research, accurate measurement of magnetic field, as well as atomic frequency standards.


To promote hands-on learning, this apparatus is designed with an open structure. Discrete components such as Rubidium lamp, absorption cell, photodetector, and lenses can be easily installed and aligned on a metal rail. A light-proof cloth cover is provided to minimize the impact of ambient light on the system.


Using this instrument, the following experiments can be conducted:


1. Observe optical pumping signal

2. Measure g-factor

3. Measure earth magnetic field (horizontal and vertical components)


Horizontal DC magnetic field0 ~ 0.2 mT, adjustable, stability < 5×10-3
Horizontal modulation magnetic field0 ~ 0.15 mT (P-P), square wave 10 Hz, triangle wave 20 Hz
Vertical DC magnetic field0 ~ 0.07 mT, adjustable, stability < 5×10-3
Photodetectorgain > 100
Rubidium lamplifetime >10000 hours
High frequency oscillator55 MHz ~ 65 MHz
Temperature control~ 90 oC
Interference filtercentral wavelength 795 ± 5 nm
Quarter wave plateworking wavelength 794.8 nm
Polarizerworking wavelength 794.8 nm
Rubidium absorption celldiameter 52 mm, temperature control 55 oC

Parts List

Main Unit1
Power Supply1
Auxiliary Source1
Wires and Cables5
Light Proof Cover1
Alignment Plate1

      Apparatus of Optical Pumping.png

Schematic of optical pumping

(Click figure to enlarge)

     Apparatus of Optical Pumping.png

System configuration

(Click photo to enlarge)


Sweep and pumping signals


Sweep and resonant signals 

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