A compact laser system for a portable atom interferometry gravimeter.
Qin Luo1, Heng Zhang1, Ke Zhang1
1MOE Key Laboratory of Fundamental Physical Quantities Measurements, Hubei Key Laboratory of Gravitation and Quantum physics, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
The Review of Scientific Instruments
|May 3, 2019
Summary
A compact laser system for a portable Rubidium-87 (87Rb) atom interferometry gravimeter was developed. This system achieves high sensitivity and resolution, enabling precise gravity measurements in a portable device.
Area of Science:
- Atomic physics
- Quantum sensing
- Gravimetry
Background:
- Atom interferometry gravimeters offer high precision for measuring gravitational acceleration.
- Miniaturization of laser systems is crucial for developing portable gravimeters.
Purpose of the Study:
- To demonstrate a compact laser system for a portable 87Rb atom interferometry gravimeter.
- To achieve high sensitivity and resolution in a reduced form factor.
Main Methods:
- Frequency doubling of a 1560 nm seed laser with digital and analog feedback control.
- Utilizing a phase modulator for Raman sideband and repumping laser generation.
- Optimization and reduction of additional sidebands in the Raman beam.
Main Results:
- Demonstrated frequency control allowing shifts over 1 GHz for Raman frequency locking to 85Rb transitions.
- Achieved atom interference with a free evolution time of 320 ms.
- Integrated laser system into a 1.5 m × 0.6 m × 0.6 m box weighing 150 kg.
Conclusions:
- The compact laser system enables portable atom interferometry gravimetry.
- Achieved gravimeter sensitivity of 53 μGal/Hz1/2 and resolution better than 1 μGal.
- The system demonstrates the feasibility of high-performance portable gravity measurement devices.
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