An analytical model of holmium-doped fiber laser is proposed and verified experimentally. The model is based on a two-level model, assumes only transitions between levels 5I8 and 5I7 of the Ho3+ ion in silica, and enables to express the threshold pump power and laser slope efficiency in a closed form. The effect of intrinsic losses is modeled by a physically motivated semi-empirical formula. The model is compared with a numerical one and its application limits are discussed.
In this contribution, we focus on development of a thulium-doped fiber-optic amplifier working in spectral range from 1800 to 2050 nm. The amplifier is core-pumped using an erbium-doped fiber laser emitting at 1565 nm with maximum output power of ~2 W. We use in-house developed and manufactured silica-based thulium-doped fibers and commercially available optical components in the setup. A tunable thulium-doped fiber laser was used as signal source allowing us to cover the whole spectral range of interest. The basic parameters of the amplifier with respect to used configuration, fiber lengths, and spectral wavelength are presented and discussed.
e present preliminary characterization of an optical fiber amplifier for wavelengths beyond the L-band based on a core pumped thulium-doped fiber developed and fabricated in-house. We explore adaptation of an existing broadband fiber optic thulium-doped source of amplified spontaneous emission, which generates radiation in a spectral region around 2 micrometer wavelengths, for the purpose of signal amplification. The amplifier is pumped by an erbium-doped fiber laser at 1566 nm in a backward configuration with respect to the pump power. We characterize the amplifier using a narrowband input signal at 1950 nm and 1996 nm. We optimize the amplifier setup by varying the length of the active fiber and pump power. Results show that amplification of <30 dB at 1950 nm with maximum output power ~300 mW is achievable with existing setups.
We report on experimental setup and characterization of a broadband fiber-optic thulium-doped source of amplified spontaneous emission, which generates radiation in a spectral region around 2 micrometer wavelengths. We present a broadband source based on core-pumped thulium-doped fiber fabricated in house using the modified chemical vapor deposition method and solution doping method, pumped by erbium-doped fiber laser at 1566 nm. The source in a backward configuration with respect to the pump operates in a single-ended configuration achieved using a simple all-fiber geometry and produces radiation with an output power of up to 350 mW. The output spectrum is combined from two local emission peaks of the Tm-doped fiber, at around 1850 nm and at around 1950 nm, with total 3-dB width of more than 140 nm and output power of 130 mW.
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