Journal
OPTICS EXPRESS
Volume 29, Issue 14, Pages 21409-21417Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.424336
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Funding
- National Natural Science Foundation of China [62075159, 61975146]
- Major Scientific and Technological Innovation Projects of Key R&D Plans in Shandong Province [2019JZZY020206]
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The single-frequency operation of a thulium fiber laser at a short wavelength of 1720 nm was investigated, achieving powerful single-longitudinal-mode operation using an unpumped thulium-doped fiber as the saturable absorber. The fiber laser delivered 407 mW single-frequency output with a spectral linewidth of 4.4 kHz under 2.7-W launched pump power at 1570 nm, transitioning to multi-longitudinal-mode operation at higher pump powers, with optical bistability observed.
The single-frequency operation of a thulium fiber laser at a short wavelength of 1720 nm is investigated in a ring resonator. Powerful single-longitudinal-mode operation was realized by utilizing an unpumped thulium-doped fiber as the saturable absorber. The fiber laser delivered 407 mW single-frequency output with a spectral linewidth of 4.4 kHz under 2.7-W launched pump power at 1570 nm, which turned to multi-longitudinal-mode operation at higher pump powers. Additionally, optical bistability of both output power and longitudinal mode behavior, originating from the saturable absorption effect, were observed and discussed. To the best of our knowledge, this is the first efficient 1.7-mu m single-frequency fiber laser as well as the first demonstration of optical bistability in thulium-doped fiber lasers. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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