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Proceedings Paper

High luminance application of orange fiber laser
Author(s): Koichi Ito; Kazunobu Kojima; Tokio Ueno; Ken-ichi Hayashi
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Paper Abstract

We developed an orange fiber laser as the source for photocoagulation in ophthalmic applications. While the beam quality (M2=1.2) is excellent in comparison with the existing solid state laser (M2=7~8), there is the unfortunate necessity of an additional optical system to make the focusing beam uniform after transmission into the 50μm core diameter multimode fiber used in the existing photocoagulator. The purpose of this paper is to obtain a high luminance spot while maintaining the uniformity of the beam. We used 4.7μm Mode field diameter, single mode fiber (SMF) to focus the laser beam emitted from the developed 580nm orange fiber laser source. A coupling efficiency of 70% was obtained at the input power of 500 mW. Moreover, the beam quality of M2=1.27 was achieved after fiber coupling. No additional optical system was necessary to make the beam uniform owing to the SMF characteristics. As a result, the beam diameter at the irradiation point became 12.2μm, and the power density was calculated to be about 25 times higher than that of the existing photocoagulator. Significantly high luminance beams were obtained in the method described above. If the laser spot can be focused near the diffraction limit using adaptive optics in the future, it can be used in new operative procedures such as microsurgery in the macular region. When this method is used in photocoagulation, improvement in the quality of vision of patients is expected due to minimizing any damage to the retina. The effects of high luminance laser irradiation on pseudobiological tissue will be examined in a future paper.

Paper Details

Date Published: 25 February 2008
PDF: 8 pages
Proc. SPIE 6844, Ophthalmic Technologies XVIII, 68441W (25 February 2008); doi: 10.1117/12.762444
Show Author Affiliations
Koichi Ito, NIDEK Co., Ltd. (Japan)
Kazunobu Kojima, NIDEK Co., Ltd. (Japan)
Tokio Ueno, NIDEK Co., Ltd. (Japan)
Ken-ichi Hayashi, NIDEK Co., Ltd. (Japan)

Published in SPIE Proceedings Vol. 6844:
Ophthalmic Technologies XVIII
Bruce E. Stuck; Fabrice Manns; Per G. Söderberg; Michael Belkin M.D.; Arthur Ho, Editor(s)

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