Anti-stokes laser cooling in bulk erbium-doped materials

Area of Science:

• Materials Science
• Laser Physics
• Solid-State Spectroscopy

Background:

• Laser-induced cooling is a process where materials can be cooled using lasers.
• Erbium (Er3+)-doped materials are promising for optical cooling applications.
• Previous research has explored various materials for laser cooling, but anti-Stokes cooling in specific crystal and glass hosts remained underexplored.

Purpose of the Study:

• To report the first observation of anti-Stokes laser-induced cooling in Er3+:KPb2Cl5 crystal and Er3+:CNBZn glass.
• To quantify the internal cooling efficiencies of these novel materials.
• To demonstrate the bulk cooling capability of the studied samples.

Main Methods:

• Photothermal deflection spectroscopy was employed to calculate internal cooling efficiencies.
• Infrared thermal imaging was used to verify bulk cooling.
• Laser excitation was applied to induce the anti-Stokes cooling effect.

Main Results:

• The first experimental evidence of anti-Stokes laser-induced cooling was achieved in both Er3+:KPb2Cl5 crystal and Er3+:CNBZn glass.
• Internal cooling efficiencies were successfully calculated for the studied materials.
• Infrared thermal scans confirmed the bulk cooling effect in the Er3+-doped samples.

Conclusions:

• The observed anti-Stokes laser-induced cooling in Er3+-doped crystal and glass validates their potential for optical cooling.
• The demonstrated bulk cooling capability suggests practical applications in thermal management and laser cooling devices.
• Further research into these materials could lead to advancements in solid-state cooling technologies.