26 April 2007 Damage threshold of acrylic polymer jackets surrounded with optical fiber by UV laser
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Proceedings Volume 6346, XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers; 63462O (2007); doi: 10.1117/12.739105
Event: XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 2006, Gmunden, Austria
Abstract
Fabrication technique of fiber Bragg gratings (FBG) sensors, which is used the measurement of distortions of large scale architectural structures, requires a skillful technique, and consequently the costing becomes a problem. The fabrication technique without removing a polymer jacket can realize much easier fabrication and the cheaper cost. We have investigated the laser damage threshold of jackets in order to realize such a fabrication technique. The 3rd and the 4th harmonics of repetitive Nd:YAG laser pulse were used as light sources. An optical fiber coated untinged polymer jackets is used as a sample. The numbers of the shots against the same sample position was varied from 1 to 1200. As a result, damage thresholds at the shot number of 1200 were 6.9 J/cm2 and 0.9 J/cm2 for the wavelength of 355 nm and 266 nm, respectively. These values are corresponding to intensity of 1.3 MW/cm2 and 0.3 MW/cm2, respectively. It is considered that the fabrication of FBG, which need a typical intensity of ~kW/cm2, without removing the jacket should be possible by controlling the laser intensity between this level and the threshold.
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Yoshinari Maezono, Iwasa Yousuke, Kou Kurosawa, Masahito Katto, Atsushi Yokotani, "Damage threshold of acrylic polymer jackets surrounded with optical fiber by UV laser", Proc. SPIE 6346, XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 63462O (26 April 2007); doi: 10.1117/12.739105; http://dx.doi.org/10.1117/12.739105
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KEYWORDS
Polymers

Fiber Bragg gratings

Optical fibers

Laser damage threshold

Polymer optical fibers

Fabrication

Near ultraviolet

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