Schematic of optical pumping
(Click figure to enlarge)
System configuration
(Click photo to enlarge)
Sweep and pumping signals
Sweep and resonant signals
Note: oscilloscope not included
Features
Open structure for hands-on learning
High accuracy for g-factor measurement
Robust system with high-quality components
Introduction
Optical pumping is a fundamental technique in modern physics that allows researchers to explore various physical phenomena, including atomic energy states and atomic transitions. This method is widely used in fields such as atomic physics, optics, electromagnetism, and electronics, with applications ranging from magnetic field measurement to atomic frequency standards.
The LEAI-19 Apparatus of Optical Pumping is designed to provide students with a hands-on learning experience. The system is constructed with an open structure, allowing easy installation and alignment of discrete components such as the Rubidium lamp, absorption cell, photodetector, and lenses on a metal rail. The design is made to be highly accessible for educational purposes, enabling students to engage directly with the experimental setup. Additionally, a light-proof cloth cover is included to minimize interference from ambient light, ensuring accurate measurements.
The instruction manual provides detailed materials, including experimental configurations, theoretical principles, and step-by-step instructions, ensuring that students can fully understand and apply the concepts of optical pumping. Please click Experiment Theory and Contents to find more information about this apparatus.
Using this instrument, the following experiments can be conducted:
1. Observe Optical Pumping Signal:
The system allows students to observe the optical pumping signal, which is a key aspect of understanding how light interacts with atomic systems to drive transitions between energy states. This experiment provides insight into the fundamental principles of atomic physics.
2. Measure g-Factor:
Students will measure the g-factor, a fundamental constant that characterizes the magnetic moment of an atom or particle. This experiment helps students understand the role of the g-factor in atomic transitions and its importance in magnetic resonance experiments.
3. Measure Earth Magnetic Field (Horizontal and Vertical Components):
By using the optical pumping technique, students can measure the earth's magnetic field, specifically its horizontal and vertical components. This experiment demonstrates how optical pumping can be used to detect and analyze magnetic fields with high precision.
Specifications
| 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 |
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 |
Schematic of optical pumping
(Click figure to enlarge)
System configuration
(Click photo to enlarge)
Sweep and pumping signals
Sweep and resonant signals
