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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

Published on: April 24, 2014

Semiconductor optical amplifier-based laser system for cold-atom sensors.

Eric Kittlaus¹, Jonathon Hunacek¹, Mahmood Bagheri¹

¹Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91009 USA.

EPJ Quantum Technology

|April 14, 2025

Summary

This summary is machine-generated.

Semiconductor optical amplifiers (SOAs) can replace bulky laser systems for quantum sensors. This innovation enables compact, low-power, field-deployable atomic sensors for applications like space-based atom interferometry.

Keywords:

Atom interferometry Flyable systems Semiconductor optical amplifiers

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Last Updated: Jun 29, 2026

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Area of Science:

Quantum Sensing
Atomic Physics
Optical Engineering

Background:

Quantum sensors utilize precise atomic control for applications like RF-electric probes and gravimeters.
Current systems require large, power-intensive laser and optics systems (LOS) unsuitable for field deployment.
Reducing the size and power consumption of LOS is crucial for advancing portable quantum technologies.

Purpose of the Study:

To investigate the feasibility of using semiconductor optical amplifiers (SOAs) in atomic sensor LOS.
To develop a compact, power-efficient LOS for atom cooling and potential space-deployable atom interferometry.
To demonstrate an all-semiconductor laser/amplifier LOS for magneto-optical trap (MOT) cooling.

Main Methods:

Evaluated off-the-shelf SOAs at wavelengths for Cesium (Cs) and Rubidium (Rb) atom cooling.
Assessed SOA switching speed (sub-microsecond) and extinction ratio (>60-65 dB).
Constructed a compact, all-semiconductor LOS integrating SOAs with custom drive electronics for MOT cooling.

Main Results:

SOAs provide rapid switching and high extinction ratios suitable for atom cooling.
The developed LOS delivers 125 mW optical power to six fiber-coupled channels for Cs atom cooling.
The entire system occupies 20x20x15 cm and consumes approximately 13.5 W DC power.

Conclusions:

SOAs offer a viable alternative to traditional laser amplifiers, enabling power-efficient LOS design.
The all-semiconductor LOS demonstrates potential for compact, low-power, flyable atomic sensor instruments.
This approach paves the way for future space-deployable atom interferometers and quantum sensors.