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Highly efficient Yb3+-doped channel waveguide laser at 981 nm.

D Geskus¹, E H Bernhardi, K van Dalfsen

¹Integrated Optical MicroSystems Group, MESA + Institute for Nanotechnology, University of Twente, Enschede, The Netherlands.

|June 6, 2013

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Researchers developed Ytterbium-doped (Yb3+) channel waveguide lasers. These lasers achieved record slope efficiency (76%) and output power (650 mW) when pumped at 934 nm, advancing rare-earth-ion-doped laser technology.

Area of Science:

Solid-state laser technology
Materials science and engineering
Photonics and optoelectronics

Background:

Channel waveguide lasers offer miniaturization and high power potential.
Rare-earth-ion-doped materials are crucial for laser applications.
Optimizing Ytterbium-doped materials is key for efficient laser operation.

Purpose of the Study:

Demonstrate 981 nm channel waveguide lasers in a novel Yb3+-doped material.
Achieve high slope efficiency and output power.
Compare laser performance under different pumping conditions.

Main Methods:

Fabrication of KY(1-x-y)Gd(x)Lu(y)(WO4)2:Yb3+ waveguides using liquid phase epitaxy.
Microstructuring of waveguides via Ar+ beam etching.

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Optical pumping experiments at 934 nm and 981 nm.

Main Results:

Record-high slope efficiency of 76% achieved with 934 nm pumping.
Record-high output power of 650 mW demonstrated for microstructured waveguide lasers.
Comparison of laser performance at 981 nm (lasing near 1025 nm) versus 934 nm pumping.

Conclusions:

The developed Yb3+-doped channel waveguide lasers show exceptional performance.
Liquid phase epitaxy and Ar+ beam etching are effective fabrication techniques.
Optimized pumping at 934 nm yields superior laser efficiency and power output.