| Issue |
J. Eur. Opt. Society-Rapid Publ.
Volume 22, Number 1, 2026
|
|
|---|---|---|
| Article Number | 44 | |
| Number of page(s) | 7 | |
| DOI | https://doi.org/10.1051/jeos/2026040 | |
| Published online | 25 May 2026 | |
Research Article
High-power, high-efficiency continuous-wave Tm:KYW laser with multimode in-band diode pumping
Laboratoire Temps-Fréquence (LTF), Institut de Physique, Université de Neuchâtel, Avenue de Bellevaux 51, 2000 Neuchâtel, Switzerland
* Corresponding author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Received:
25
February
2026
Accepted:
19
April
2026
Abstract
We report a high-power, high-efficiency continuous-wave Tm:KY(WO4)2 (Tm:KYW) laser based on multimode in-band diode pumping at 1720 nm. In-band pumping reduces the quantum defect compared to conventional 800-nm pumping, enabling efficient high-power operation. We demonstrate up to 4.55 W of output power near 1.94 μm with a slope efficiency of 83% with respect to absorbed pump power, approaching the quantum-defect limit. The laser provides smooth wavelength tunability from 1839 to 2100 nm and maintains near-diffraction-limited transverse beam quality across the full operating range. These results indicate that multimode in-band pumping of Tm:KYW is a simple and compact route to efficient, broadband, high-power sources in the 1.9–2.0 μm region, providing a practical basis for future high-power Q-switched and mode-locked systems.
Key words: Continuous-wave lasers / High-power lasers / In-band multimode diode pumping / Purged operation / CW Tm:KYW laser / SWIR lasers
© The Author(s), published by EDP Sciences, 2026
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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