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Efficient, resonantly pumped, room-temperature Er3+:GdVO4 laser.

N Ter-Gabrielyan¹, V Fromzel, W Ryba-Romanowski

¹US Army Research Laboratory, Adelphi, Maryland 20783, USA. nikolay.e.tergabrielyan.civ@mail.mil

|April 3, 2012

Summary

We demonstrate an efficient room-temperature Er3+:GdVO4 laser operating at 1598.5 nm. This study presents the first resonantly pumped, in-band, room-temperature Er3+:GdVO4 laser, achieving significant output power.

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Area of Science:

Laser physics
Solid-state materials
Optical engineering

Background:

Erbium-doped gadolinium vanadate (Er3+:GdVO4) is a promising material for laser applications.
Resonant (in-band) pumping can improve laser efficiency by reducing thermal load and increasing pump absorption.

Purpose of the Study:

To report the first resonantly pumped, room-temperature operation of an Er3+:GdVO4 laser.
To characterize the laser performance under different pumping schemes.

Main Methods:

The Er3+:GdVO4 crystal was pumped resonantly using an Er-fiber laser at 1538.6 nm for continuous wave (CW) operation.
Quasi-continuous wave (QCW) operation was achieved using a commercial laser diode bar stack.
Laser output power and slope efficiency were measured.

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Main Results:

Continuous wave (CW) operation yielded a maximum output power of 3.5 W with a slope efficiency of 56% under resonant pumping.
Quasi-continuous wave (QCW) operation produced 7.7 W with a slope efficiency of approximately 53% versus absorbed pump power.
The laser operated efficiently at room temperature without active cooling.

Conclusions:

Efficient room-temperature operation of a resonantly pumped Er3+:GdVO4 laser at 1598.5 nm has been achieved.
Resonant pumping offers a viable and efficient method for exciting Er3+:GdVO4 lasers.
This work establishes a new benchmark for in-band pumped, room-temperature solid-state lasers.