IR laser power transmission through silver halide crystals and polycrystalline fibers

Lev Nagli; D. Burstein; Shaul Shalem; David Bunimovich; Alla German; Abraham Katzir

doi:10.1117/12.274270

IR laser power transmission through silver halide crystals and polycrystalline fibers

Lev Nagli, D. Burstein, Shaul Shalem, David Bunimovich, Alla German, Abraham Katzir

Research output: Contribution to journal › Conference article › peer-review

Abstract

Laser-induced breakdown (LIB) thresholds in AgCl_xBr _1-x crystals and fibers were studied under CO₂ laser pulses and CW excitation. The value of LIB threshold P_c of the bulk crystals is about 7.2·10⁸ W/cm² for AgCl and 4·10⁹ W/cm² for AgBr under 60 ns TEA laser excitation. The LIB threshold in fibers is much smaller; about 2·10 ⁸ W/cm². The absorption of the crystals at 10.6 μm changes from 8·10^-5 cm^-1 for AgCl to 2·10^-5 cm^-1 for AgBr; for fibers with the same composition absorption is much greater (3·10^-4 cm^-1 for AgCl; 2·10^-4 cm^-1 for AgBr). The dependence of the LIB and IR absorption on composition, and mechanical and temperature treatments suggests that the LIB in silver halide crystals and fibers is due to the avalanche electrons in a high electric field. The initial free electrons for this process are supplied by ionization of the cation vacancy - charged dislocation complexes. The relatively lower optical stability of the fibers is due to the increased concentration of defects formed in the hot extrusion of the crystal. A simple thermal annealing method for reduction of the IR absorption is proposed.

Original language	English
Pages (from-to)	545-552
Number of pages	8
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	2966
DOIs	https://doi.org/10.1117/12.274270
State	Published - 1997
Externally published	Yes
Event	Laser-Induced Damage in Optical Materials: 1996 - Boulder, CO, United States Duration: 7 Oct 1996 → 7 Oct 1996

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title = "IR laser power transmission through silver halide crystals and polycrystalline fibers",

abstract = "Laser-induced breakdown (LIB) thresholds in AgClxBr 1-x crystals and fibers were studied under CO2 laser pulses and CW excitation. The value of LIB threshold Pc of the bulk crystals is about 7.2·108 W/cm2 for AgCl and 4·109 W/cm2 for AgBr under 60 ns TEA laser excitation. The LIB threshold in fibers is much smaller; about 2·10 8 W/cm2. The absorption of the crystals at 10.6 μm changes from 8·10-5 cm-1 for AgCl to 2·10-5 cm-1 for AgBr; for fibers with the same composition absorption is much greater (3·10-4 cm-1 for AgCl; 2·10-4 cm-1 for AgBr). The dependence of the LIB and IR absorption on composition, and mechanical and temperature treatments suggests that the LIB in silver halide crystals and fibers is due to the avalanche electrons in a high electric field. The initial free electrons for this process are supplied by ionization of the cation vacancy - charged dislocation complexes. The relatively lower optical stability of the fibers is due to the increased concentration of defects formed in the hot extrusion of the crystal. A simple thermal annealing method for reduction of the IR absorption is proposed.",

author = "Lev Nagli and D. Burstein and Shaul Shalem and David Bunimovich and Alla German and Abraham Katzir",

year = "1997",

doi = "10.1117/12.274270",

language = "אנגלית",

volume = "2966",

pages = "545--552",

journal = "Proceedings of SPIE - The International Society for Optical Engineering",

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note = "Laser-Induced Damage in Optical Materials: 1996 ; Conference date: 07-10-1996 Through 07-10-1996",

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T1 - IR laser power transmission through silver halide crystals and polycrystalline fibers

AU - Nagli, Lev

AU - Burstein, D.

AU - Shalem, Shaul

AU - Bunimovich, David

AU - German, Alla

AU - Katzir, Abraham

PY - 1997

Y1 - 1997

N2 - Laser-induced breakdown (LIB) thresholds in AgClxBr 1-x crystals and fibers were studied under CO2 laser pulses and CW excitation. The value of LIB threshold Pc of the bulk crystals is about 7.2·108 W/cm2 for AgCl and 4·109 W/cm2 for AgBr under 60 ns TEA laser excitation. The LIB threshold in fibers is much smaller; about 2·10 8 W/cm2. The absorption of the crystals at 10.6 μm changes from 8·10-5 cm-1 for AgCl to 2·10-5 cm-1 for AgBr; for fibers with the same composition absorption is much greater (3·10-4 cm-1 for AgCl; 2·10-4 cm-1 for AgBr). The dependence of the LIB and IR absorption on composition, and mechanical and temperature treatments suggests that the LIB in silver halide crystals and fibers is due to the avalanche electrons in a high electric field. The initial free electrons for this process are supplied by ionization of the cation vacancy - charged dislocation complexes. The relatively lower optical stability of the fibers is due to the increased concentration of defects formed in the hot extrusion of the crystal. A simple thermal annealing method for reduction of the IR absorption is proposed.

AB - Laser-induced breakdown (LIB) thresholds in AgClxBr 1-x crystals and fibers were studied under CO2 laser pulses and CW excitation. The value of LIB threshold Pc of the bulk crystals is about 7.2·108 W/cm2 for AgCl and 4·109 W/cm2 for AgBr under 60 ns TEA laser excitation. The LIB threshold in fibers is much smaller; about 2·10 8 W/cm2. The absorption of the crystals at 10.6 μm changes from 8·10-5 cm-1 for AgCl to 2·10-5 cm-1 for AgBr; for fibers with the same composition absorption is much greater (3·10-4 cm-1 for AgCl; 2·10-4 cm-1 for AgBr). The dependence of the LIB and IR absorption on composition, and mechanical and temperature treatments suggests that the LIB in silver halide crystals and fibers is due to the avalanche electrons in a high electric field. The initial free electrons for this process are supplied by ionization of the cation vacancy - charged dislocation complexes. The relatively lower optical stability of the fibers is due to the increased concentration of defects formed in the hot extrusion of the crystal. A simple thermal annealing method for reduction of the IR absorption is proposed.

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JO - Proceedings of SPIE - The International Society for Optical Engineering

JF - Proceedings of SPIE - The International Society for Optical Engineering

T2 - Laser-Induced Damage in Optical Materials: 1996

Y2 - 7 October 1996 through 7 October 1996

ER -

IR laser power transmission through silver halide crystals and polycrystalline fibers

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