Share Email Print
cover

Proceedings Paper

Transmission of free-running and Q-switched Er:YAG and Er:YSGG laser energy through germanium oxide/silica fibers
Author(s): Nathaniel M. Fried; Yubing Yang; Kyunhee Lee; Hussain Arbab Tafti
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

Endoscopic Erbium laser applications have been limited by the lack of a suitable optical fiber. This study describes a hybrid germanium oxide/silica fiber for transmission of Q-switched and free-running Er:YAG and Er:YSGG laser radiation. Hybrid fibers consisted of a 1-meter-long germanium trunk fiber connected to a 1-cm-long silica fiber tip using PTFE, PET, or PTFE/FEP heat-shrink tubing. Maximum transmission of Er:YAG energy through fiber trunk/tip diameters of 250/365, 350/365, and 450/550 μm were recorded. The transmission rates through 450/550 μm fibers using Q-switched (500 ns) and free-running (300 μs) Er:YAG and Er:YSGG laser pulses were also measured. Maximum free-running Er:YAG pulse energies (fluences) measured up to 103 mJ (98 J/cm2), 112 mJ (107 J/cm2), and 233 mJ (98 J/cm2), respectively, through 250/365, 350/365, and 450/550 hybrid fibers. Free-running Er:YAG and Er:YSGG transmission averaged 56% and 65%, with an attenuation of 1.1 ± 0.1 dB/m and 0.6 ± 0.1 dB/m, respectively, after correction for Fresnel losses (n = 7). Q-switched Er:YAG and Er:YSGG laser transmission averaged 55% and 62%, with an attenuation of 1.1 ± 0.2 dB/m and 0.9 ± 0.3 dB/m, respectively. Both Q-switched lasers transmitted a maximum pulse energy of 13 mJ (n = 7). The germanium/silica fiber is promising for use with the Erbium laser in applications requiring contact laser tissue ablation through a flexible endoscope.

Paper Details

Date Published: 23 March 2005
PDF: 5 pages
Proc. SPIE 5691, Optical Fibers and Sensors for Medical Applications V, (23 March 2005); doi: 10.1117/12.586355
Show Author Affiliations
Nathaniel M. Fried, Johns Hopkins Medical Institutions (United States)
Yubing Yang, Johns Hopkins Medical Institutions (United States)
Kyunhee Lee, Johns Hopkins Univ. (United States)
Hussain Arbab Tafti, Johns Hopkins Medical Institutions (United States)


Published in SPIE Proceedings Vol. 5691:
Optical Fibers and Sensors for Medical Applications V
Israel Gannot, Editor(s)

© SPIE. Terms of Use
Back to Top