Attenuation at 106μm in loaded and unloaded polycrystalline KRS-5 fibers

Harrington, James A.; Standlee, A. G.

doi:10.1364/ao.22.003073

Cited by 16 publications

(2 citation statements)

References 6 publications

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“…The Ϫ2 dependence suggests that the scattering is dominated by Rayleigh-Gans or Mie mechanisms rather than by Rayleigh scattering. 32,33 Rayleigh-Gans scattering has been shown to occur in some polycrystalline IR fibers when the bulk defects are large in the transverse dimension compared to the wavelength of light but small in optical path difference. A further strong indication that the main scattering mechanism is Rayleigh-Gans is the large degree of forward scattering that we observed.…”

Section: Fiber Lossmentioning

confidence: 99%

Optical properties of single-crystal sapphire fibers

1997

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Single-crystal sapphire fibers have been grown with the laser-heated pedestal-growth method with losses as low as 0.3 dB /m at 2.94 ?m. With the incorporation of a computer-controlled feedback system, fibers have been grown with less than +/-0.5 % diameter variation, or +/-1.5 ?m for a 300- ?m fiber. The losses in these fibers have been reduced further through a postgrowth anneal at 1000 degrees C in air, from 5.4 to 1.5 dB /m at 543 nm and from 0.4 -0.3 dB /m at 2.94 ?m. These fibers delivered 4.7 W at 10 Hz of Er:YAG laser power.

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Section: Fiber Lossmentioning

confidence: 99%

Optical properties of single-crystal sapphire fibers

1997

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“…The temperature change of the refractive index due to electronic absorption, dn~/dT, of KRS-6 (68 mol % T1C1) was determined by Takahei and Kobayashi [9] to be -160 x 10-6/K over the interval 40 to 300 K. Afanas'ev and Nosov [29] give dn/dT = -254 • 10-6/K for KRS-5 and dn/dT = -234 • 10-6/K for KRS-6 at 0.633/zm. Available data includes the laser-calorimetry measurements of Harrington et al [30] on crystalline KRS-5 at HF and DF laser wavelengths; transmission measurements on long polycrystalline KRS-5 fibers at 10.6 ~m by Harrington and Standlee [31]; laser calorimetry at 1, 5, and 10/xm by Belousov et al [32] on crystalline KRS-5 and KRS-6; carbon-monoxide laser calorimetry measurements of Nosov et al [33] on crystalline KRS-5 and KRS-6; and differentialspectrophotometry measurements of Hidaka et aL [12] on crystalline KRS-5. Available data includes the laser-calorimetry measurements of Harrington et al [30] on crystalline KRS-5 at HF and DF laser wavelengths; transmission measurements on long polycrystalline KRS-5 fibers at 10.6 ~m by Harrington and Standlee [31]; laser calorimetry at 1, 5, and 10/xm by Belousov et al [32] on crystalline KRS-5 and KRS-6; carbon-monoxide laser calorimetry measurements of Nosov et al [33] on crystalline KRS-5 and KRS-6; and differentialspectrophotometry measurements of Hidaka et aL [12] on crystalline KRS-5.…”

Section: Mixed Thallous Halides Krs-5 and Krs-6mentioning

confidence: 99%

Cubic Thallium(l) Halides

Tropf

1997

Handbook of Optical Constants of Solids

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A new method for measuring absorption losses in an infrared optical fiber

Ishiwatari

1994

Electron Comm Jpn Pt II

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Pressure‐extruded infrared optical fiber is a polycrystalline structure with grain sizes of 30 to 70 μm, and it exhibits a large amount of attenuation. the attenuation due to scattering is more than one‐half the total attenuation and is induced by the residual strain, surface roughness, and grain boundary defects. In the investigation of loss mechanisms, it is indispensable to measure separately the different losses such as absorption loss and scattering loss. Since the scattering loss can be measured by an integrating sphere sliding along the fiber axis, the absorption loss is obtained by the subtraction of the scattering loss from the total loss. This paper proposes a new method for directly measuring the absorption loss, and experiments using this method were carried out. the method is based on the thermal expansion associated with temperature rise due to the absorption. It is shown that the absorption loss can be evaluated by measuring the time response of the elongation of the fiber in which the laser power is absorbed. In addition a new measuring method for the heat transfer coefficient of the fiber also is proposed. Using these methods, the absorption and scattering losses of KRS‐5 optical fiber were measured. the results indicate that the scattering loss is about 1.5 times larger than the absorption loss.

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Attenuation at 106μm in loaded and unloaded polycrystalline KRS-5 fibers

Cited by 16 publications

References 6 publications

Optical properties of single-crystal sapphire fibers

Optical properties of single-crystal sapphire fibers

Cubic Thallium(l) Halides

A new method for measuring absorption losses in an infrared optical fiber

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