Published April 21, 2026
| Version v1
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Highly efficient, depressed-cladding thulium-doped fiber laser at 1762 nm
Authors/Creators
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1.
Military University of Technology in Warsaw
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2.
Czech Academy of Sciences, Institute of Photonics and Electronics
Description
A continuous-wave (CW) multi-Watt-level 1.76-μm allfiber Tm-doped laser resonantly pumped at 1.56 μm is
presented. To mitigate long-wavelength amplified spontaneous emission (ASE), an in-house-drawn depressed-cladding Tm-doped fiber (dc-TDF) was used as an active medium. In a linear cavity, an output power of 2.47 W, with an optical signal-to-noise ratio (SNR) exceeding 65 dB and a high slope efficiency of 75.8% relative to the launched power, was demonstrated. Furthermore, bidirectional pumping enabled output power scaling over 4 W with a slope efficiency of 66%. To our knowledge, this is the first demonstration of 1.7-μm laser operation using dc-TDFs.
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Additional details
Related works
- Is documented by
- Dataset: https://doi.org/10.5281/zenodo.19409560 (URL)
Funding
Dates
- Submitted
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2026-01-12
- Accepted
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2026-04-03
- Available
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2026-04-20