Abstract
The modeling and design of fiber lasers facilitate the process of their practical realization. Of particular interest during the last few years is the development of lanthanide ion-doped fiber lasers that operate at wavelengths exceeding 2000 nm. There are two main host glass materials considered for this purpose, namely fluoride and chalcogenide glasses. Therefore, this study concerned comparative modeling of fiber lasers operating within the infrared wavelength region beyond 2000 nm. In particular, the convergence properties of selected algorithms, implemented within various software environments, were studied with a specific focus on the central processing unit (CPU) time and calculation residual. Two representative fiber laser cavities were considered: One was based on a chalcogenide–selenide glass step-index fiber doped with trivalent dysprosium ions, whereas the other was a fluoride step-index fiber doped with trivalent erbium ions. The practical calculation accuracy was also assessed by comparing directly the results obtained from the different models.
Highlights
Due to many potential applications in medicine, biology, environmental monitoring, and defense, a large research effort has been devoted to the development of fiber lasers operating at wavelengths exceeding 2000 nm
The modeling parameters for the dysprosium trivalent ion-doped chalcogenide–selenide glass fiber laser are summarized in Table 1, whereas in Table 2 the modeling parameters for the erbium trivalent ion-doped fluoride glass fiber laser are given
A low value of the fiber loss is necessary for the realization of an efficient fiber laser and is widely used in fiber laser modeling-related literature [17,25,42,43,44]
Summary
Due to many potential applications in medicine, biology, environmental monitoring, and defense, a large research effort has been devoted to the development of fiber lasers operating at wavelengths exceeding 2000 nm. A particular advantage of lanthanide ion-doped fiber lasers is their high output beam quality and compact structure: So far, such fiber lasers have only been demonstrated at wavelengths
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