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Updated: Jan 11, 2026

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

Study on narrow linewidth randomly distributed weak feedback external-cavity diode laser.

Fujun Xu, Xiaxiao Wang, Xiaobin Xu

|November 11, 2025

Summary

This summary is machine-generated.

We demonstrated a narrow linewidth randomly distributed weak feedback external-cavity diode laser (RDWF-ECDL). This RDWF-ECDL achieves a single longitudinal mode output with a 100 Hz linewidth, ideal for high-coherence applications.

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Last Updated: Jan 11, 2026

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

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Published on: April 24, 2014

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Published on: December 18, 2015

Area of Science:

Photonics and Laser Technology
Optical Engineering
Semiconductor Lasers

Background:

External-cavity diode lasers (ECDLs) are crucial for applications requiring specific spectral properties.
Achieving narrow linewidths and single longitudinal mode (SLM) operation in ECDLs remains a key challenge.
Randomly distributed weak feedback (RDWF) offers a novel approach to laser cavity design.

Purpose of the Study:

To investigate and experimentally demonstrate a novel RDWF-ECDL configuration.
To generalize the Lang-Kobayashi laser rate equations for RDWF systems.
To analyze the impact of external cavity parameters on RDWF-ECDL performance.

Main Methods:

Theoretical analysis using generalized Lang-Kobayashi rate equations for arbitrary feedback points.
Experimental construction of RDWF-ECDLs using three different fiber Bragg grating arrays (FBGAs).
Characterization of laser output, including optical signal-to-noise ratio (OSNR), linewidth, and frequency noise.

Main Results:

Successful demonstration of a SLM RDWF-ECDL.
Achieved an OSNR of 78 dB, a linewidth of 100 Hz, and white frequency noise of 15 Hz²/Hz with FBGA20 feedback.
Experimental results verified the theoretical analysis of external cavity parameter influence.

Conclusions:

The generalized theoretical model provides guidance for RDWF-ECDL design and optimization.
The RDWF-ECDL exhibits a narrow linewidth, making it suitable for high-coherence demanding applications.
This RDWF-ECDL technology shows promise for advanced photonic systems.