Efficient resonantly pumped 2.8-microm Er(3+):GSGG laser

Area of Science:

• Materials Science
• Optics and Photonics
• Laser Physics

Background:

• Erbium-doped materials are crucial for various laser applications.
• Achieving efficient laser operation at 2.8 micrometers presents unique challenges.
• Understanding population dynamics is key to optimizing laser performance.

Purpose of the Study:

• To demonstrate efficient continuous-wave (cw) laser operation of the Er(3+):GSGG transition at 2.8 micrometers.
• To investigate the factors contributing to high laser efficiency.
• To explore the role of upconversion in laser performance.

Main Methods:

• Utilized Er(3+):GSGG crystal for laser medium.
• Employed direct diode pumping at 0.97 micrometers.
• Characterized laser output and efficiency at room temperature.

Main Results:

• Achieved efficient cw laser operation at 2.8 micrometers.
• Recorded a slope efficiency of 36% for the 2.8-microm laser.
• Demonstrated greater than unity quantum efficiency, attributed to upconversion.

Conclusions:

• Efficient 2.8-micrometer laser operation in Er(3+):GSGG is feasible at room temperature.
• Population recycling through upconversion significantly enhances laser efficiency.
• This work highlights the potential of Er(3+):GSGG for mid-infrared laser applications.