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Semiconductor membrane microchip laser.

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|December 19, 2025

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We developed a compact semiconductor microchip membrane external-cavity surface-emitting laser (MECSEL). This laser achieves over 1W output power and record slope efficiency (~51.4%) with excellent beam quality.

Area of Science:

Optics and Photonics
Semiconductor Lasers
Materials Science

Background:

Semiconductor lasers are crucial for various applications.
Compact, high-power laser sources with excellent beam quality are in demand.
Membrane external-cavity surface-emitting lasers (MECSELs) offer a promising platform for advanced laser design.

Purpose of the Study:

To demonstrate a novel semiconductor microchip membrane external-cavity surface-emitting laser (MECSEL).
To investigate the performance characteristics, including output power, efficiency, and beam quality.
To analyze the thermal properties and the dependence of the thermal lens on pump power.

Main Methods:

Fabrication of a micron-thin semiconductor gain region membrane sandwiched between transparent heat spreaders.

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Assembly of a compact, plane-parallel solid-state laser cavity (∼1 mm length) with reflective coatings.

Optical pumping using a fiber-coupled diode laser module (808 nm) and characterization of laser output.

Main Results:

Demonstrated continuous wave output power exceeding 1 W at 1123 nm.
Achieved a record slope efficiency of approximately 51.4% for MECSELs.
Maintained excellent beam quality (TEM₀₀, M² < 1.05) and investigated polarization properties.

Conclusions:

The developed microchip MECSEL is a highly efficient and compact laser source.
This technology offers customizable emission wavelengths and high-power output with superior beam quality.
The system's thermal properties were characterized, providing insights for further optimization.