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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

External-cavity semiconductor-laser array insensitive to paraxial misalignment.

R Pillai, E Garmire

|October 29, 2009

Summary

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We developed a new laser array with a tilted-mirror external cavity. This design provides a stable, high-quality beam that is insensitive to misalignment, improving efficiency and performance.

Area of Science:

Optics and Photonics
Semiconductor Lasers
Laser Engineering

Background:

External-cavity diode lasers offer improved beam quality over free-running devices.
Gain-guided laser arrays typically suffer from poor beam quality and sensitivity to misalignment.
Maintaining stable, high-power output from laser arrays is crucial for various applications.

Purpose of the Study:

To report a novel tilted-mirror external-cavity design for gain-guided laser arrays.
To demonstrate insensitivity to cavity element misalignments.
To achieve a near-diffraction-limited, single-lobed beam with high efficiency.

Main Methods:

Implementation of a tilted-mirror external-cavity configuration.
Characterization of the laser array's output power and beam quality across the operating current range.

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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

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Evaluation of light-current (L-I) characteristics and efficiency.

Design of a compact graded-index lens for beam collimation.

Main Results:

The tilted-mirror external-cavity laser array produced a near-diffraction-limited (1.5 times diffraction-limited) single-lobed beam.
Output power remained insensitive to small misalignments of cavity elements.
The laser array exhibited linear and kink-free L-I characteristics.
Improved efficiency was observed compared to free-running laser arrays.
A compact graded-index lens successfully emitted a collimated beam with a circular cross-section.

Conclusions:

The tilted-mirror external-cavity design offers a robust solution for achieving high-quality, stable beams from gain-guided laser arrays.
This configuration overcomes the limitations of free-running arrays, providing enhanced performance and efficiency.
The developed laser system and lens design are suitable for applications requiring stable, collimated laser output.