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Impact of additional sidebands generated by a tapered amplifier on an atom interferometer
Optics Letters
|October 1, 2022
Summary
Using a single laser amplifier in atom interferometers creates unwanted sidebands that reduce precision. Separating laser amplification eliminates these sidebands, enabling high-precision atom interferometry.
Area of Science:
- Atomic physics
- Quantum optics
- Laser technology
Background:
- Stimulated Raman transitions are crucial for wave packet manipulation in atom interferometers (AI).
- A common laser configuration combines two Raman frequencies before amplification by a single tapered amplifier (TA).
- Nonlinear effects in single TAs generate unwanted sidebands, impacting AI performance.
Purpose of the Study:
- To investigate the impact of additional sidebands generated by a single TA on AI precision.
- To explore methods for suppressing these sidebands and their effect on AI measurements.
- To establish guidelines for designing high-precision AI laser systems.
Main Methods:
- Observation of additional sidebands in the Raman laser using a Fabry-Pérot interferometer (FPI).
- Measurement of position-dependent Raman transitions in an AI at varying TA injection powers.
- Spectroscopic analysis of Raman lasers amplified by single versus dual TAs.
Main Results:
- Additional sidebands generated by a single TA were observed and suppressed by reducing injection power.
- While sideband intensity decreased, induced phase shifts in the AI were not significantly reduced.
- Employing two separate TAs for laser amplification eliminated the impact of sidebands on the AI.
Conclusions:
- Single-stage TA amplification in Raman lasers for AI introduces detrimental sidebands.
- Reducing TA injection power partially mitigates but does not eliminate sideband-induced phase shifts.
- Separate amplification of Raman laser frequencies using dual TAs is essential for high-precision atom interferometry.
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