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Diode-pumped 1-W continuous-wave Er:YAG 3-mum laser.

D W Chen, C L Fincher, T S Rose

|December 12, 2007

Summary

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Researchers developed a novel diode laser system producing 1.15 W of continuous-wave output at 2.94 micrometers using an Er-doped YAG crystal. This advancement offers high efficiency for various laser applications.

Area of Science:

Laser physics
Materials science
Optoelectronics

Background:

Erbium-doped YAG (Er:YAG) lasers are valuable for applications requiring specific wavelengths.
Developing efficient diode-pumped solid-state lasers is crucial for compact and powerful laser sources.

Purpose of the Study:

To demonstrate a diode laser end-pumped monolithic Er:YAG laser.
To achieve continuous-wave (cw) output at 2.94 micrometers with high efficiency.

Main Methods:

Utilized a monolithic laser crystal: Er-doped YAG bonded to undoped YAG.
Employed two polarization-coupled 2.5-W flared laser diodes for pumping.
Achieved a 45-micrometer pump waist with a low numerical aperture (N.A. < 0.04).

Main Results:

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Generated 1.15 W of Gaussianlike (M(2) = 2) cw output power at 2.94 micrometers.
Achieved a 34% slope efficiency.
Demonstrated a quantum efficiency greater than unity.

Conclusions:

The developed diode-pumped monolithic Er:YAG laser is an efficient source at 2.94 micrometers.
This system shows promise for applications requiring high-power, specific-wavelength laser output.