Influence of a feedback coupling on operating characteristics of a Cr3+:LiSrAlF6 laser using an end-coupled fiber grating |
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| Authors: | H Parhat NJ Vasa M Kidosaki T Okada M Maeda T Mizunami O Uchino |
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| Institution: | (1) Graduate School of Information Science and Electrical Engineering, Kyushu University, Fukuoka 812-8581, Japan (Fax: +81-92/642-3969, E-mail: vasa@ed.kyushu-u.ac.jp), JP;(2) Department of Electrical Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan, JP;(3) Atmospheric Environment Division, Japan Meteorological Agency, Tokyo 100, Japan, JP |
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| 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.
Received: 23 April 1999 / Revised version: 3 August 1999 / Published online: 30 November 1999 |
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| Keywords: | PACS: 42 55 R 42 60B 42 60D |
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