Optical losses of AgClBr crystals and fibers in the middle infrared

Israeli, Sapir; Katzir, Abraham

doi:10.1016/j.optmat.2011.07.002

Cited by 9 publications

(2 citation statements)

References 13 publications

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“…In a previous research, 20 we showed that the bulk scattering in silver halide fibers is mainly due to pores, as had also been suggested previously by Butvina et al 7 It was shown there 20 that the scattering coefficient can be described by the following equation:…”

Section: Scattererssupporting

confidence: 72%

Attenuation, absorption, and scattering in silver halide crystals and fibers in the mid-infrared

Israeli

Katzir

2014

Journal of Applied Physics

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Absorption measurements on silver bromide crystals and fibers in the infrared J. Appl. Phys. 113, 043111 (2013); 10.1063/1.4789633 Mid-infrared (λ=8.4-9.9μm) light scattering from porcine tissue Appl. Phys. Lett. 101, 093705 (2012); 10.1063/1.4748331Hot free-electron absorption in nonparabolic III-V semiconductors at mid-infrared wavelengths Absorption spectrum of silver bromide crystals and fibers in the 9-11 μm wavelength rangeThe attenuation and the absorption of silver halide crystal and fibers in the mid-IR were measured. The absorption coefficients of silver halide crystals, deformed crystals, and fibers were measured by laser calorimetry at several different wavelengths in the near-IR and the mid-IR. The absorption coefficients of the fibers were higher than those of the deformed crystals and these were higher than those of the un-deformed crystals. We suggest that the absorption behavior is best described by a weak absorption tail. The total attenuation in fibers was measured using the cut back method.The scattering values were calculated by subtracting the absorption coefficients from the total attenuation coefficients. The scattering in the silver halide fibers was ascribed to pores of estimated size of 0.7 lm. We showed that the main contribution to the attenuation of fibers in the mid-IR range was due to scattering and suggested that reducing the scattering will dramatically improve the transmission of silver halide fibers in the mid-IR. V C 2014 AIP Publishing LLC.

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Section: Scattererssupporting

confidence: 72%

Attenuation, absorption, and scattering in silver halide crystals and fibers in the mid-infrared

Israeli

Katzir

2014

Journal of Applied Physics

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“…Unlike in silica fibers, where the scattering losses vary with 1/ λ 4 (Rayleigh scattering), the scattering in silver halide fibers decreases for longer wavelength with 1/ λ 2 [27]. In order to determine the laser intensity exciting the sample, the transmission t ( λ ) of both MIR fibers was measured.…”

Section: Resultsmentioning

confidence: 99%

Mid-Infrared Fiber-Coupled Photoacoustic Sensor for Biomedical Applications

Kottmann

Grob

Rey

et al. 2013

Sensors

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Biomedical devices employed in therapy, diagnostics and for self-monitoring often require a high degree of flexibility and compactness. Many near infrared (NIR) optical fiber-coupled systems meet these requirements and are employed on a daily basis. However, mid-infrared (MIR) fibers-based systems have not yet found their way to routine application in medicine. In this work we present the implementation of the first MIR fiber-coupled photoacoustic sensor for the investigation of condensed samples in the MIR fingerprint region. The light of an external-cavity quantum-cascade laser (1010–1095 cm−1) is delivered by a silver halide fiber, which is attached to the PA cell. The PA chamber is conically shaped to perfectly match the beam escaping the fiber and to minimize the cell volume. This results in a compact and handy sensor for investigations of biological samples and the monitoring of constituents both in vitro and in vivo. The performance of the fiber-coupled PA sensor is demonstrated by sensing glucose in aqueous solutions. These measurements yield a detection limit of 57 mg/dL (SNR = 1). Furthermore, the fiber-coupled sensor has been applied to record human skin spectra at different body sites to illustrate its flexibility.

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