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Widely tunable, efficient 2 μm laser in monocrystalline Tm3+:SrF2
Optics Express
|March 14, 2018
Summary
Monocrystalline Thulium (Tm3+):Strontium Fluoride (SrF2) crystals exhibit broad spectral bands and efficient laser operation near 2 μm. These findings highlight SrF2
Area of Science:
- Materials Science
- Laser Physics
- Solid-State Spectroscopy
Background:
- Thulium-doped materials are crucial for generating laser light in the 2-micrometer wavelength range.
- Understanding doping site effects and ion clustering is essential for optimizing laser performance.
- Strontium fluoride (SrF2) is explored as a host material for rare-earth ion doping.
Purpose of the Study:
- To investigate the growth, spectroscopic properties, and laser operation of monocrystalline Thulium (Tm3+)-doped Strontium Fluoride (SrF2).
- To analyze the impact of inequivalent doped sites and charge compensation on spectral characteristics and ion behavior.
- To evaluate the potential of Tm3+:SrF2 for efficient 2-micrometer laser applications.
Main Methods:
- Crystal growth of monocrystalline Tm3+:SrF2.
- Spectroscopic analysis including absorption and emission band characterization.
- Continuous-wave laser operation testing and tuning range measurement.
Main Results:
- Confirmed broad absorption and emission bands due to inequivalent Tm3+ sites and ion clustering.
- Achieved continuous-wave laser emission around 2 μm with efficiencies comparable to other Tm-doped crystals.
- Demonstrated an uninterrupted tuning range of 180 nm between 1.8 and 2 μm.
Conclusions:
- SrF2 host material promotes cooperative mechanisms between Tm ions, enhancing laser performance.
- Low doping concentrations in Tm3+:SrF2 yield remarkable laser efficiencies.
- Tm3+:SrF2 is a promising material for efficient 2-micrometer laser sources.
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