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High-speed Continuous-wave Stimulated Brillouin Scattering Spectrometer for Material Analysis
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Broadly tunable continuous-wave Tm:CALYO laser operating on the 3H4→3H5 transition
Optics Express
|May 4, 2026
Summary
We achieved broadly tunable diode-pumped laser operation in a disordered Thulium-doped Calcium Yttrium Orthoaluminate (Tm:CALYO) crystal. This Tm:CALYO laser shows promise for generating ultrashort femtosecond pulses in the mid-infrared region.
Area of Science:
- Laser Physics
- Materials Science
Background:
- Thulium-doped crystals are crucial for generating mid-infrared laser light.
- Disordered crystalline materials offer unique spectroscopic properties for laser applications.
Purpose of the Study:
- To investigate the laser performance of a disordered Tm:CALYO crystal.
- To explore the potential of Tm:CALYO for broadly tunable laser operation and femtosecond pulse generation.
Main Methods:
- Diode-pumped laser operation was demonstrated using a Tm:CALYO crystal.
- An intracavity birefringent filter was employed to achieve tunable laser output.
- Polarized spectroscopic properties of Tm3+ ions in CALYO were analyzed.
Main Results:
- Broadly tunable laser operation was achieved with tuning ranges of 258 nm (π-polarization) and 225 nm (σ-polarization).
- Maximum continuous-wave output power of 1.10 W at 2.3 µm was obtained with a 6.4% slope efficiency.
- A large stimulated-emission cross section and broad emission bandwidth (>250 nm) were observed for π-polarized light.
Conclusions:
- Tm:CALYO is a promising gain material for tunable lasers and femtosecond pulse generation in the 2.3-2.4 µm range.
- Crystal annealing conditions significantly impact laser performance, offering a route for optimization.
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