Diode-pumped continuous-wave green upconversion lasing of Er(3+):LiLuF(4) using multipass pumping.

Area of Science:

• Solid-state laser physics
• Materials science

Background:

• Upconversion lasing in rare-earth-doped materials is crucial for various photonic applications.
• Erbium-doped fluoride crystals are promising candidates for upconversion lasers.

Purpose of the Study:

• To demonstrate efficient green upconversion lasing in Er(3+):LiLuF(4).
• To investigate the performance of Er(3+):LiLuF(4) under different pumping conditions.
• To achieve diode-pumped continuous-wave (cw) lasing at room temperature.

Main Methods:

• Utilized a multipass pumping configuration to enhance pump absorption.
• Employed a Ti:sapphire laser for initial pumping to characterize the material.
• Investigated diode-pumped cw lasing at room temperature.

Main Results:

• Achieved powerful green upconversion lasing with a maximum output power of 213 mW using Ti:sapphire laser pumping.
• Demonstrated diode-pumped cw lasing at room temperature, a novel achievement for this material.
• The Er(3+):LiLuF(4) crystal showed efficient upconversion properties.

Conclusions:

• Er(3+):LiLuF(4) is a highly efficient material for green upconversion lasing.
• The multipass pumping setup significantly enhances lasing performance.
• Diode-pumped room-temperature cw lasing is feasible, opening avenues for practical applications.