Abstract.
We describe a comparative study related to an influence of a feedback coupling on operating characteristics of a cw Cr3+:LiSrAlF6 (Cr3+:LiSAF) laser using an end-coupled fiber grating with different coupling configurations. To achieve a compact construction, a direct butt-coupling of the fiber grating at the pump end of the Cr3+:LiSAF laser and pumping through the same fiber was considered. The feedback provided by the coupled fiber grating through an end mirror was responsible for a spectrally narrowed output with a slope efficiency of 11%. However, the performance critically depended on an amount of the feedback coupling. The feedback-coupling condition was improved considerably by using a lens-coupled fiber grating at the pump end of the Cr3+:LiSAF crystal. A spectrally narrowed output of ≈0.15 cm-1 was obtained, and the output slope efficiency was measured as 27%. Theoretical modeling was also performed to understand the effect of the feedback coupling and the results agreed well with the experimental observations.
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Received: 23 April 1999 / Revised version: 3 August 1999 / Published online: 30 November 1999
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Parhat, H., Vasa, N., Kidosaki, M. et al. Influence of a feedback coupling on operating characteristics of a Cr3+:LiSrAlF6 laser using an end-coupled fiber grating . Appl Phys B 70, 361–366 (2000). https://doi.org/10.1007/s003400050058
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DOI: https://doi.org/10.1007/s003400050058