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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

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Hybrid membrane-external-cavity surface-emitting laser.

Mingyang Zhang, Alexander R Albrecht, Catherine Nguyen

|November 11, 2022

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We developed a novel optically-pumped semiconductor disk laser with an active mirror architecture. This design offers superior thermal performance compared to traditional Vertical External Cavity Surface Emitting Lasers (VECSELs), achieving high output power.

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Area of Science:

Optics and Photonics
Semiconductor Lasers
Materials Science

Background:

Semiconductor disk lasers (SDLs) are crucial for high-power laser applications.
Traditional Vertical External Cavity Surface Emitting Lasers (VECSELs) face thermal management challenges.
Novel architectures are needed to improve heat dissipation and performance.

Purpose of the Study:

To develop and analyze a new optically-pumped semiconductor disk laser architecture.
To investigate the thermal performance of the proposed design.
To demonstrate the laser's output power and beam quality.

Main Methods:

Designed an active mirror architecture by sandwiching a semiconductor gain membrane between two heatspreaders.
Coated one heatspreader with a high-reflectivity multilayer.
Utilized an InGaAs/GaAs multiple quantum well (MQW) gain structure.
Employed an in-well pumped geometry for optical pumping.

Main Results:

Thermal modeling indicated superior performance compared to traditional VECSELs.
Achieved approximately 30 W of output power.
Demonstrated operation at a center wavelength of approximately 1178 nm.
Obtained a TEM₀₀ (fundamental Gaussian) mode output.

Conclusions:

The developed active mirror semiconductor disk laser architecture offers improved thermal management.
The laser demonstrates high output power and excellent beam quality.
This design represents a significant advancement for high-power semiconductor laser sources.