Physics Lab Equipment

LEAI-19 Apparatus of Optical Pumping

LEAI-19 Apparatus of Optical Pumping


  • Open structure for hands-on learning

  • High accuracy for g-factor measurement

  • Robust system


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 spectral lamp, absorbing cell, photodetector, and other optical components can be easily installed and aligned. 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)


Description Specifications
Horizontal DC magnetic field 0 ~ 0.2 mT, adjustable, stability < 5×10-3
Horizontal modulation magnetic field 0 ~ 0.15 mT (P-P), square wave 10 Hz, triangle wave 20 Hz
Vertical DC magnetic field 0 ~ 0.07 mT, adjustable, stability < 5×10-3
Photodetector gain > 100
Rubidium lamp lifetime >10000 hours
High frequency oscillator 55 MHz ~ 65 MHz
Temperature control ~ 90 oC
Interference filter central wavelength 795 ± 5 nm
Quarter wave plate working wavelength 794.8 nm
Polarizer working wavelength 794.8 nm
Rubidium absorption cell diameter 52 mm, temperature control 55 oC
RF signal generator (not included) range 0.1~ 2 MHz, output power > 0.5 W at 50 Ω load

Parts List

Description Qty
Main Unit 1
Power Supply 1
Auxiliary Source 1
Wires and Cables 5
Compass 1
Light Proof Cover 1
Wrench 1
Alignment Plate 1
Manual 1

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Schematic of optical pumping

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System configuration


Sweep and pumping signal

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Resonant signal and sweep signal

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