Mechanical properties of hollow glass waveguides

Rabii, Christopher D.; Harrington, James A.

doi:10.1117/1.602261

Cited by 22 publications

(9 citation statements)

References 23 publications

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“…3(b). Typical properties of glass FBGs were used in the simulation: P 11 =0.121, P 12 =0.270 [48][49][50], E f = 73.1 GPa [51], v f =0.17 [49,52] and n eff =1.457 [53]. The BW evolves non-linearly with the time.…”

Section: C-2 Configurationmentioning

confidence: 99%

Simultaneous Measurement of Effective Chemical Shrinkage and Modulus Evolutions During Polymerization

2010

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A novel method is proposed to simultaneously measure the effective chemical shrinkage and modulus evolutions of advanced polymers during polymerization. The method utilizes glass fiber Bragg grating (FBG) sensors. They are embedded in two uncured cylindrical polymer specimens with different configurations and the Bragg wavelength (BW) shifts are continuously documented during the polymerization process. A theoretical relationship is derived between the BW shifts and the evolution properties, and an inverse numerical procedure to determine the properties from the BW shifts is established. Extensive numerical analyses are conducted to provide general guidelines for selecting an optimum combination of the two specimen configurations. The method is implemented for a high-temperature curing thermosetting polymer. Validity of the proposed method is corroborated by two independent verification experiments: a self-consistency test to verify the measurement accuracy of raw data and a warpage measurement test of a bi-material strip to verify the accuracy of evolution properties.

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Section: C-2 Configurationmentioning

confidence: 99%

Simultaneous Measurement of Effective Chemical Shrinkage and Modulus Evolutions During Polymerization

2010

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“…For example, the roughness of the silver film leads to a predictable increase in attenuation. 9 In addition, spectra can provide information on the integrity and uniformity of the films. Wang et al 11 used a spectroscopic analysis to evaluate the effectiveness of the curing stage for polymer films deposited inside a similar hollow waveguide.…”

Section: Location Of Minimum Loss Regionmentioning

confidence: 99%

“…This discrepancy is due to roughness in the silver film, which leads to large scattering loss at short wavelengths. 8,9 By studying the differences between the calculated and measured spectrum we can better tailor the optical properties of the HGWs through modification of the liquid phase chemistry process 10 used to deposit the films. For example, the roughness of the silver film leads to a predictable increase in attenuation.…”

Section: Location Of Minimum Loss Regionmentioning

confidence: 99%

Measurement and control of thin film uniformity in hollow glass waveguides

Rabii

1999

Opt. Eng

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Hollow glass waveguides provide an attractive means for the delivery of IR laser power and for broadband temperature and chemical fiber sensor applications. These waveguides are made using liquidphase chemistry techniques to deposit a thin dielectric film of AgI over metallic Ag on the inside of small-bore silica tubing. By controlling the thickness of the AgI film, we can tailor the optical response of the guides to give low loss at selected IR laser wavelengths or to produce a broadband response. In either case, the losses depend on the thickness uniformity of the AgI film. Initially, the AgI film thickness varies as much as 14% from end to end of a 6-m long guide. A faster AgI deposition rate reduces this variation to only 1.3% over a 5-m long waveguide. This leads to a reduction in the total loss for the hollow guides in the 2 to 12 m region.

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“…In the procedure of silver layer inner-coating, water and other plating solutions react on the capillary surface. It causes tiny cracks on the glass surface and weakens the mechanical strength [9]. Therefore, we once inner-coated a polymer film that works as protective layer on the surface of the glass capillary.…”

Section: Introductionmentioning

confidence: 99%

Improvement of transmission properties for a rugged polymer-coated silver hollow fiber

et al. 2015

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An extremely rugged hollow fiber is fabricated by liquid-phase coating technique. A silica glass capillary is used as the substrate and vitreous film is firstly coated on the inner surface of the capillary to protect the glass tube from moisture. This protective coating keeps the thin-wall glass tube away from damage due to the following silver plating process. The additional transmission loss caused by the roughness of the protective film is decreased by limiting the length of the protective film. The whole length of 0.7-mm-bore hollow fiber was 1.2 m and the length of the rugged part which formed the protective film was only 30 cm. Transmission properties of the rugged polymer-coated silver hollow fibers for the Er:YAG laser and red pilot beam delivery have been improved. The loss for the 0.7-μm-bore size, 1.2-m-length rugged polymer-coated silver hollow fiber was 1 dB and 6.9 dB under straight condition, and 1.9 dB and 9.4 dB under the condition of a 270 degree bend with a 15-mm bending radius at the wavelength of 2.94 μm and 650 nm, respectively.

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Mechanical properties of hollow glass waveguides

Cited by 22 publications

References 23 publications

Simultaneous Measurement of Effective Chemical Shrinkage and Modulus Evolutions During Polymerization

Simultaneous Measurement of Effective Chemical Shrinkage and Modulus Evolutions During Polymerization

Measurement and control of thin film uniformity in hollow glass waveguides

Improvement of transmission properties for a rugged polymer-coated silver hollow fiber

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