Infrared optical constants for CO2 laser waveguide materials

Worrell, Charles A.

doi:10.1007/bf01117354

Cited by 34 publications

(13 citation statements)

References 14 publications

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“…The IR reflectivity spectra of A and B samples are almost identical and for the sake of clarity only the spectrum of sample A is shown. The reflectivity spectra are in reasonable agreement with those published [21].…”

Section: Originalsupporting

confidence: 89%

Efective infrared reflectivity and dielectric function of polycrystalline alumina ceramics

Petzelt

Borodavka

Vaněk

et al. 2016

Physica Status Solidi (b)

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Room‐temperature infrared (IR) reflectivity, terahertz transmission and evaluated effective complex dielectric response of four polycrystalline alumina ceramics (corundum) with highly anisotropic grains in the IR range were determined. The spectra were compared with modelled spectra based on the known IR response of sapphire single crystal and Bruggeman and Lichtenecker models of the effective medium approximation (EMA). The results are extremely sensitive to the surface treatment (polishing), but do not depend on the grain size in the range of ∼0.3–1 μm and on the weak doping, needed for processing of optically transparent ceramics. As all the samples show similar grain shapes and topology, no measurable differences among the fully dense samples were observed. Agreement with the modelled spectra is reasonable, but shows a higher effective mode damping. A weak geometrical resonance was revealed near 500 cm−1, better described by the Bruggeman model. The small sample porosity up to 6.2% is revealed mainly as a reduced reflectivity above ∼650 cm−1, which produces weak losses in the high‐frequency range above the TO phonon modes, better described by the Lichtenecker model.

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Section: Originalsupporting

confidence: 89%

Efective infrared reflectivity and dielectric function of polycrystalline alumina ceramics

Petzelt

Borodavka

Vaněk

et al. 2016

Physica Status Solidi (b)

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“…These appear to be related to major absorption peaks seen by others in polycrystalline alumina. 25 Related peaks in crystalline alumina have also been identified. 26 The doublet between 0.16 and 0.22 eV could be related to the incorporation of some component of the anodization solution.…”

Section: Wide Spectrum Results For Dried Layersmentioning

confidence: 92%

Optical characterization of porous alumina from vacuum ultraviolet to midinfrared

Thompson

Snyder

Castro

et al. 2005

Journal of Applied Physics

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Porous alumina was fabricated and optically characterized over a wide spectral range. Layers were formed electrochemically in oxalic acid solution from 10-m-thick aluminum films evaporated onto silicon wafers. The layer formation was monitored with in situ spectroscopic ellipsometry in the visible and near-infrared wavelength range to accurately determine the thickness and dielectric functions. Anisotropy due to the columnar nature of the porous structure was determined using optical modeling. The porous alumina layer was found to have a small but significant absorption tail throughout the visible region. Atomic force microscopy and scanning electron microscopy were used throughout the process to assess the quality of pore formation. The mean pore center-to-center spacing was approximately 100 nm with thicknesses up to 5 m. The infrared spectra revealed absorption peaks previously seen in ceramic alumina and peaks not associated with bulk alumina.

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“…The n r and K of the GeO 2 glass layer are calculated according to Eqs. (2)-(4), where R is the reflectance at near normal incidence and φ is phase angle [3,6,20,21]. The calculated n r and K values are given in Fig.…”

Section: Resultsmentioning

confidence: 99%

Liquid Phase Deposition of GeO2 Glass Hollow Waveguide for Delivery of CO2 Laser Radiation

Chen¹,

Chu²,

et al. 2012

2012 Symposium on Photonics and Optoelectronics

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CO 2 laser (wavelength 10.6 μm) has important applications in laser surgery, material processing, infrared sensors and imaging. CO 2 laser optical waveguides are gaining a central position in these applications. Glass-drawing technique and sol-gel methods have been used to prepare GeO 2 and germania-based glass hollow waveguides. In this work, a GeO 2 glass hollow waveguide sample was fabricated by using a liquid phase deposition (LPD) approach. The morphology, structure and optical transmission properties of the sample were studied. The results indicate that a GeO 2 glass reflective layer could be formed on the inner wall of a silica glass capillary tube via the LPD process. The GeO 2 glass layer and the substrate silica glass tube constitute an attenuated total reflectance (ATR) hollow waveguide structure. An n r <1 band centering at around 10.6 μm is observed by loss spectrum analysis of the sample. The sample shows a mean loss of 1.13 dB/m for delivery of a ~35 W CO 2 laser beam (TEM 00 ). Keywords-CO 2 laser, GeO 2 glass hollow waveguide, anomalous dispersion, liquid phase deposition (LPD) processI.

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Infrared optical constants for CO2 laser waveguide materials

Cited by 34 publications

References 14 publications

Efective infrared reflectivity and dielectric function of polycrystalline alumina ceramics

Efective infrared reflectivity and dielectric function of polycrystalline alumina ceramics

Optical characterization of porous alumina from vacuum ultraviolet to midinfrared

Liquid Phase Deposition of GeO2 Glass Hollow Waveguide for Delivery of CO2 Laser Radiation

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