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Proximal Selenium Co-doping In Er:caf2 Crystal For Efficient 2.75 Μm Lasers.

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Proximal Selenium Co-doping In Er:caf2 Crystal For Efficient 2.75 Μm Lasers.

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Proximal selenium co-doping in Er:CaF₂ crystal for efficient 2.75 µm lasers.

Fan Zhang, Xuan Tong, Wudi Wang

|June 1, 2026

View abstract on PubMed

Summary

This summary is machine-generated.

Anion-engineering in fluorite crystals, specifically Er,Se-co-doped CaF2, enhances erbium laser performance by reducing non-radiative relaxation. This breakthrough enables efficient mid-infrared laser operation with improved lifetimes and high slope efficiencies.

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Seeded Synthesis of CdSe/CdS Rod and Tetrapod Nanocrystals

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Area of Science:

Materials Science
Laser Physics
Solid-State Chemistry

Background:

Non-radiative relaxation is a major limitation in erbium-based mid-infrared lasers.
Developing novel materials is crucial for overcoming performance bottlenecks in laser technology.

Purpose of the Study:

To investigate the impact of anion-engineering on erbium-doped fluorite crystals for laser applications.
To demonstrate efficient mid-infrared laser operation using a modified crystal structure.

Main Methods:

Co-doping CaF2 crystals with Erbium (Er) and Selenium (Se).
Characterization of luminescence properties and lifetimes.
First-principles calculations to understand crystal lattice dynamics and ion interactions.
Laser performance testing under different pumping schemes.

Main Results:

Er,Se-co-doped CaF2 exhibited extended lifetimes compared to Er:CaF2.
First-principles calculations revealed Se2- proximity to Er3+ clusters and introduced low-frequency phonon modes.
Achieved efficient 2.75 µm continuous-wave laser operation.
Demonstrated high slope efficiencies of 34.4% (976 nm pumping) and 12.2% (1532 nm pumping).

Conclusions:

Anion-engineering via Se-doping effectively suppresses non-radiative relaxation in Er:CaF2 lasers.
This approach facilitates efficient mid-infrared laser operation.
The study highlights the potential of anion-engineering for designing advanced laser materials.