Processing and characterization of silver films used to fabricate hollow glass waveguides

Rabii, Christopher D.; Gibson, Dan; Harrington, James A.

doi:10.1364/ao.38.004486

Cited by 44 publications

(19 citation statements)

References 15 publications

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“…At 10.5 um we obtained a good agreement between the losses predicted by the theory and the experimental results, demonstrating that the contribution due to scattering losses results is almost negligible for this longer wavelength. In addition, this result confirms that our HCWs have a nearly ideal structure of the glass and perfect circular uniformity of the cross section [22,23].…”

Section: Propagation Lossessupporting

confidence: 81%

Single mode operation with mid-IR hollow fibers in the range 51-105 µm

Sampaolo¹,

Patimisco²,

Kriesel³

et al. 2015

Opt. Express

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Single mode beam delivery in the mid-infrared spectral range 5.1-10.5 μm employing flexible hollow glass waveguides of 15 cm and 50 cm lengths, with metallic/dielectric internal layers and a bore diameter of 200 μm were demonstrated. Three quantum cascade lasers were coupled with the hollow core fibers. For a fiber length of 15 cm, we measured losses down to 1.55 dB at 5.4 μm and 0.9 dB at 10.5 μm. The influence of the launch conditions in the fiber on the propagation losses and on the beam profile at the waveguide exit was analyzed. At 10.5 µm laser wavelength we found near perfect agreement between measured and theoretical losses, while at ~5 µm and ~6 µm wavelengths the losses were higher than expected. This discrepancy can be explained considering an additional scattering loss effect, which scales as 1/λ 2 and is due to surface roughness of the metallic layer used to form the high-reflective internal layer structure of the hollow core waveguide. 37(9), 2454-2458 (1998). 10. J. Kriesel, G. M. Hagglund, N. Gat, V. Spagnolo, and P. Patimisco, "Spatial mode filtering of mid-infrared (mid-IR) laser beams with hollow core fiber optics," Proc. SPIE 8993, 89930V (2014). 11. https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=7062#SingleMode.

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Section: Propagation Lossessupporting

confidence: 81%

Single mode operation with mid-IR hollow fibers in the range 51-105 µm

Sampaolo¹,

Patimisco²,

Kriesel³

et al. 2015

Opt. Express

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“…Generally, this is first and foremost achieved by minimizing the Ag film thickness, as longer deposition times inherently increase surface roughness due to a number of mechanisms. [5] On the other hand, it is essential to deposit a sufficiently thick Ag film so as to prevent transmission of incident light. In practice, the Ag film thickness should be thicker than the penetration depth of the application wavelength.…”

Section: Silver Thin Film Coated Hgwsmentioning

confidence: 99%

Silver and silver / polystyrene coated hollow glass waveguides for the transmission of visible and infrared radiation

Bledt

Harrington

2012

Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XII

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This study involves the optimization of thin silver coated Hollow Glass Waveguides (HGWs) for low-loss delivery of laser radiation at visible wavelengths and discusses preliminary work in the development of polystyrene dielectric thin films in silver coated HGWs for low-loss radiation delivery at near and far infrared wavelengths. The optimization of the silver thin film deposition procedure in HGWs for reduced transmission losses at λ = 500 -1050 nm is presented along with experimental results. Such low-loss hollow waveguides are capable of delivering high power / high energy laser light with no functional damage. The benefits and use of novel polystyrene thin films in HGWs is likewise presented and preliminary experimental results are discussed along with potential applications of said polystyrene coated waveguides. Polystyrene is an attractive material for use as a dielectric thin film in HGWs due to its relatively low refractive index nearing the optimal refractive index of n = 1.414 for use as a single dielectric thin film in HGWs. Furthermore, its nontoxicity, low cost, and chemical inertness add to its beneficial use as a transparent thin film at visible and infrared wavelengths ranging from λ = 500 -3,000 nm and λ > 50 μm. Its broadband transparency additionally allows for its simultaneous use as a dielectric film in HGWs at infrared and visible wavelengths. Preliminary results in the development of polystyrene coated HGWs optimized for transmission at short and long wavelengths are presented, primarily through FTIR spectroscopic methods. The design for the optimization of deposited polystyrene thin films in HGWs based on desired transmission wavelength range is discussed.

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“…The HGW structure was composed of a silica tube, inside of which was deposited a metallic layer followed by a dielectric layer for enhanced reflectivity. The HGWs used in this experiment had silver (Ag) as the metallic film and silver iodide (AgI) as the dielectric thin film 14 . The transmittance of the silver halide fiber, HGWs and bulk filters was measured by an FTIR spectrometer (Bruker, model Vector 22), and results are shown in fig.3.…”

Section: Multi-spectral Fiberoptic Radiometersmentioning

confidence: 99%

Fiber optic infrared multispectral radiometers for emissivity and temperature measurements of gray bodies near room temperatures

et al. 2004

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Two fiberoptic infrared multi-spectral radiometers were constructed for measurements of the temperature and the emissivity of gray bodies whose temperatures were close to room temperature (40-70 o C). In one radiometer, the different spectral regions were obtained by using standard bulk interference filters, and in a second radiometer, the different spectral regions were obtained by using hollow glass waveguides (HGWs) as filters. Using these two radiometers, we carried out temperature and emissivity measurements of three gray bodies which had high emissivity (ε=0.97), medium emissivity (ε=0.71) and low emissivity (ε=0.025). We present the results obtained for these gray bodies and discuss the advantages and disadvantages in using each of the radiometers.

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Processing and characterization of silver films used to fabricate hollow glass waveguides

Cited by 44 publications

References 15 publications

Single mode operation with mid-IR hollow fibers in the range 51-105 µm

Single mode operation with mid-IR hollow fibers in the range 51-105 µm

Silver and silver / polystyrene coated hollow glass waveguides for the transmission of visible and infrared radiation

Fiber optic infrared multispectral radiometers for emissivity and temperature measurements of gray bodies near room temperatures

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