Thermal Lensing and Laser-Induced Damage in Special Pure Chalcogenide Ge<sub>35</sub>As<sub>10</sub>S<sub>55</sub> and Ge<sub>20</sub>As<sub>22</sub>Se<sub>58</sub> Glasses under Quasi-CW Fiber Laser Irradiation at 1908 nm
Special pure chalcogenide glass is the material of choice for many mid-infrared optical fibers and fiber lasers. In this paper, the thermo-optical lensing and laser-induced damage were studied in Ge<sub>35</sub>As<sub>10</sub>S<sub>55</sub> and Ge<sub>20<...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-02-01
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| Series: | Photonics |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2304-6732/10/3/252 |
| Summary: | Special pure chalcogenide glass is the material of choice for many mid-infrared optical fibers and fiber lasers. In this paper, the thermo-optical lensing and laser-induced damage were studied in Ge<sub>35</sub>As<sub>10</sub>S<sub>55</sub> and Ge<sub>20</sub>As<sub>22</sub>Se<sub>58</sub> glasses and compared with the well-studied As<sub>2</sub>S<sub>3</sub> glass. The thermal Z-scan technique with the quasi-CW Tm-doped fiber laser at 1908 nm was applied to study thermal lensing in chalcogenide glass. The laser-induced damage of various chalcogenide glasses was determined using the one-on-one procedure. The thermal nonlinear refractive index of the Ge<sub>35</sub>As<sub>10</sub>S<sub>55</sub> and Ge<sub>20</sub>As<sub>22</sub>Se<sub>58</sub> glasses was found to be lower than that of the As<sub>2</sub>S<sub>3</sub> glass. The laser-induced damage threshold of the Ge<sub>20</sub>As<sub>22</sub>Se<sub>58</sub> glass was determined to be higher than that of the Ge<sub>35</sub>As<sub>10</sub>S<sub>55</sub> glass. The difference in the thermal damage threshold of the Ge<sub>35</sub>As<sub>10</sub>S<sub>55</sub> and Ge<sub>20</sub>As<sub>22</sub>Se<sub>58</sub> glasses and their lower value in comparison with the As<sub>2</sub>S<sub>3</sub> glass were explained by a deviation from the stoichiometry of glass compositions and their tendency to crystallize. |
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| ISSN: | 2304-6732 |