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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

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Optically pumped semiconductor quantum dot disk laser operating at 1180 nm.

Jussi Rautiainen¹, Igor Krestnikov, Mantas Butkus

¹Optoelectronics Research Centre, Tampere University of Technology, Korkeakoulunkatu 3, 33720 Tampere, Finland. jussi.rautiainen@tut.fi

|March 3, 2010

Summary

We developed a new optically pumped semiconductor disk laser utilizing InGaAs quantum dots. This laser achieves 1.75 W of single-transverse-mode output at 1180 nm with a circular beam shape.

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Area of Science:

Optics
Materials Science
Semiconductor Physics

Background:

Semiconductor disk lasers (SDLs) offer unique advantages for high-power laser generation.
Efficient heat dissipation remains a critical challenge for scaling SDL performance.
Quantum dot active regions provide broad gain bandwidth and low transparency power.

Purpose of the Study:

To demonstrate an optically pumped semiconductor disk laser with high output power and good beam quality.
To investigate the performance of InGaAs quantum dots as the gain medium in an SDL architecture.
To assess the effectiveness of a diamond heat spreader in managing thermal load.

Main Methods:

Fabrication of a 39-layer Stranski-Krastanov InGaAs quantum dot structure grown epitaxially on a GaAs/AlAs distributed Bragg reflector.

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Integration of the quantum dot gain structure with an intracavity diamond crystal heat spreader.

Optical pumping of the laser structure and characterization of output power, beam quality, and wavelength.

Main Results:

Achieved a single-transverse-mode output power of 1.75 W.
Obtained a circular beam shape with a beam quality factor M(2)<1.2.
Operated the laser at a wavelength of 1180 nm in a disk laser geometry.

Conclusions:

Optically pumped semiconductor disk lasers using InGaAs quantum dots are a viable technology for high-power laser applications.
The use of a diamond heat spreader effectively manages thermal dissipation, enabling high output power.
The demonstrated performance highlights the potential of quantum dot gain media for advanced laser systems.