Journal
ADVANCED PHOTONICS RESEARCH
Volume 3, Issue 2, Pages -Publisher
WILEY
DOI: 10.1002/adpr.202100256
Keywords
optical bistability; saturable absorption effects; single-frequency fiber oscillators
Categories
Funding
- National Natural Science Foundation of China [61975146, 62075159]
- Major Scientific and Technological Innovation Projects of Key R&D Plans in Shandong Province [2019JZZY020206]
- National Key R&D Program of China [2017YFF0104603]
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This article introduces a method of achieving single-frequency operation in fiber lasers using the saturable absorption effect of unpumped, rare earth-doped fiber. The characteristics of the saturable absorption effect in thulium-doped fiber are studied, and the oscillating state and frequency output characteristics of the laser are manipulated by injecting auxiliary pump light to the saturable absorber. A record single-frequency output power of 2.56W at 1720 nm is obtained.
The saturable absorption effect of unpumped, rare earth-doped fiber can be used as a method of achieving single-frequency operation in fiber lasers. This effect in thulium-doped fiber is used to achieve single-frequency operation from an all-fiber oscillator centered at 1720 nm. The characteristics of the saturable absorption effect are carefully studied and numerous operating regimes are identified wherein the oscillating state and frequency output characteristics of the laser can be manipulated via the injection of auxiliary pump light to the saturable absorber. A record single-frequency output power of 2.56W at 1720 nm is obtained; the slope efficiency is 44% and the laser linewidth is 3.3 kHz. The power scaling of the laser is only limited by the available power of the single-mode 1570 nm pump source. Herein, new insights into methods of generating high-power, single-frequency emission from all-fiber oscillators are offered.
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