Erbium-Doped Fibers Designed for Random Single-Frequency Lasers Operating in the Extended L-Band
The paper presents the results of developing Er-doped optical fibers for creating random single-frequency lasers in the wavelength range of 1570–1610 nm. The possibility of broadening the luminescence band of Er<sup>3+</sup> ions in silicate glasses in the long-wavelength region of the s...
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| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-12-01
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| Series: | Photonics |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2304-6732/11/12/1175 |
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| Summary: | The paper presents the results of developing Er-doped optical fibers for creating random single-frequency lasers in the wavelength range of 1570–1610 nm. The possibility of broadening the luminescence band of Er<sup>3+</sup> ions in silicate glasses in the long-wavelength region of the spectrum by introducing a high concentration of P<sub>2</sub>O<sub>5</sub>, as well as by additional doping with Sb<sub>2</sub>O<sub>3</sub>, is investigated. It is found that both approaches do not improve the dynamics of luminescence decay in the L-band. In addition, Er<sub>2</sub>O<sub>3</sub>-GeO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub> and Er<sub>2</sub>O<sub>3</sub>-GeO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub>-P<sub>2</sub>O<sub>5</sub>-SiO<sub>2</sub> glasses were studied as the core material for L-band optical fibers. The developed fibers exhibited high photosensitivity and a high gain of 5 and 7.2 dB/m, respectively. In these fibers, homogeneous arrays of extended weakly reflecting Bragg gratings were recorded directly during the fiber drawing process. Samples of arrays 5 m long and with a narrow reflection maximum at ~1590 nm were used as the base for laser resonators. Narrow-band random laser generation in the wavelength region of 1590 nm was recorded for the first time. At a temperature of 295 K, the laser mode was strictly continuous wave and stable in terms of output power. The maximal power exceeded 16 mW with an efficiency of 16%. |
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| ISSN: | 2304-6732 |