Measurement and control of thin film uniformity in hollow glass waveguides

Rabii, Christopher D.

doi:10.1117/1.602304

Cited by 10 publications

(10 citation statements)

References 13 publications

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“…where m is the order of the interference maxima; p is the wavelength of the m'th interference peak; and n is the refractive index of the dielectric film. 11 From Fig. 2 we see that the position of the first interference peak is at p 1 ϭ2.9 m. Using Eq.…”

Section: Fabrication Of Rigid Coherent Hgw Ir Bundlesmentioning

confidence: 89%

Coherent hollow-core waveguide bundles for infrared imaging

et al. 2004

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Coherent IR fiber optic bundles for use in IR imaging from 2 to 12 m are fabricated from rigid hollow-glass waveguide arrays. The bore of each hollow glass tube in the bundle is coated with thin films of metallic Ag followed by AgI for enhanced reflectivity. The coating of the rigid bundle is done using liquid phase chemistry techniques applied to all tubes simultaneously. The hollow-glass arrays are composed of up to 900 individual tubes with bore sizes as small as 50 m. Several rigid hollow-core arrays are used to transmit an IR image of a small loop of hot wire and a sample of tissue heated by a CO 2 laser.

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Section: Fabrication Of Rigid Coherent Hgw Ir Bundlesmentioning

confidence: 89%

Coherent hollow-core waveguide bundles for infrared imaging

et al. 2004

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“…Figure 5 shows the interference spectra of PbS and CdS compared to AgI films on Ag. As the data show, all interference peaks are quite sharp, indicating that the dielectric films are comparable to AgI in uniformity with a RMS surface roughness of 20 nm 9,15 . CdS, in addition to the interference peak at 5.4 µm, also shows two absorption peaks at 5.1 µm and 6.1 µm.…”

Section: Film Uniformitymentioning

confidence: 92%

Characterization of metal-sulfide-coated hollow glass waveguides

Pedersen

Harrington

2004

Optical Fibers and Sensors for Medical Applications IV

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Hollow glass waveguides (HGWs) have been fabricated with CdS and PbS dielectric coatings deposited on Ag. HGWs were fabricated with both single layer CdS and PbS coatings on Ag and with multilayer CdS/PbS coatings on Ag. The straight and bending losses for the Ag/metal-sulfide HGWs have been measured at 10.6 µm. Single layer Ag/metalsulfide HGWs have theoretical losses comparable to the traditional Ag/AgI fibers, but the transmission range can be extended to wavelengths as short as 500 nm for CdS films. The use of multiple metal-sulfide layers can reduce the losses substantially, with a theoretical 3-fold reduction in loss using a 3 layer CdS/PbS/CdS stack. The measured losses of metal/metal-sulfide HGWs are higher than predicted by theory. A single layer CdS HGW has a loss 3-4 times higher than Ag/AgI. A single layer Ag/PbS HGW has a loss 8 times higher than Ag/AgI. A 3-layer Ag/CdS/PbS/CdS have a loss 50% lower than single layer Ag/CdS

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“…Since the reflection is not a total reflection, the loss of the hollow fiber depends on the reflection rate of the inner surface. To decrease the transmission loss, it is necessary to increase the reflection rate of the inner surface [7,8]. In a practical hollow fiber, normally a dielectric layer is coated on the inner wall of a metal tube.…”

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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Measurement and control of thin film uniformity in hollow glass waveguides

Cited by 10 publications

References 13 publications

Coherent hollow-core waveguide bundles for infrared imaging

Coherent hollow-core waveguide bundles for infrared imaging

Characterization of metal-sulfide-coated hollow glass waveguides

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

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