Nanosecond laser-induced surface damage of optical multimode fibers and their preforms

Motivated by previous work on three-dimensional (3D) fabrication inside dielectrics, we report experimental results of 3D modification inside intrinsic silicon wafers using laser pulses with 1.55 μm wavelength and 3.5 ns pulse duration. Permanent modification in the form of lines is generated inside silicon by tightly focusing and continuously scanning the laser beam inside samples, without introducing surface damage. Cross sections of these lines are observed after cleaving the samples, and are further analyzed after mechanical polishing followed by chemical etching. With the objective lens corrected for spherical aberration, tight focusing inside silicon is achieved and the optimal focal depth is identified. The laser-induced modification has a triangular shape and appears in front of the geometrical focus, suggesting significant absorption in those regions and resulting in reduced energy density. The morphology of modified regions is found to be dependent on the laser polarization.

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Analysis of output surface damage resulting from single 351 nm, 3 ns pulses on sub-nanosecond laser conditioned KD 2 PO 4 crystals

10.1117/12.752957 ◽

2007 ◽

Cited By ~ 2

Author(s):

J. A. Jarboe ◽

J. J. Adams ◽

R. P. Hackel

Keyword(s):

Surface Damage ◽

Nanosecond Laser ◽

Output Surface

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Influence of Technological Parameters on Nanosecond Laser-Induced Surface Damage of Optical Multimode Fibers

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.39-40.225 ◽

2008 ◽

Vol 39-40 ◽

pp. 225-230 ◽

Cited By ~ 1

Author(s):

Markus Eberstein ◽

Guido Mann ◽

Jens Vogel ◽

M. Zoheidi ◽

Jörg Krüger

Keyword(s):

Fiber Quality ◽

Core Material ◽

Nanosecond Laser ◽

Technological Parameters ◽

Breakdown Threshold ◽

Core Diameter ◽

Multimode Fibers ◽

Essential Components ◽

Laser Induced Damage ◽

532 Nm

High-power optical multimode fibers are essential components for materials processing and surgery and can limit the reliability of expensive systems due to breakdown at the end faces. The breakdown threshold of fibers is determined by intrinsic materials properties and parameters of the technology applied. The aim of this paper is the identification of technological parameters that are crucial for the fiber quality. Fibers were drawn from preforms of Heraeus SWU with core material F300 and a low amount of OH-. Both, the cladding (fluorine doped SiO2) to core diameter ratio (CCDR) and the drawing speed were varied. CCDR values between 1.05 and 1.4 were used. Afterwards, the laser-induced damage thresholds (LIDT) of the fibers were determined. For comparison, also samples from preforms, which underwent different thermal treatments above the transition temperature, were tested with respect to their damage resistivity. Single and multi pulse LIDT measurements were done in accordance with the relevant ISO standards. Nd:YAG laser pulses with durations of 15 ns (1064 nm wavelength) and 8.5 ns (532 nm) at a repetition rate of 10 Hz were utilized. For the fibers, LIDT values (1-on-1, 1064 nm and 532 nm) increased with growing CCDR and with decreasing drawing velocities.

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Nanosecond laser-induced surface damage of optical multimode fibers and their preforms

Influence of vacuum on nanosecond laser-induced surface damage morphology in fused silica at 1064 nm

Nanosecond laser-induced surface damage and material failure mechanism of single crystal CaF2 (111) at 355 nm

Nanosecond laser damage of optical multimode fibers

Surface damage induced by a combined millisecond and nanosecond laser

Time-resolved imaging of processes associated with exit-surface damage growth in fused silica following exposure to nanosecond laser pulses

Wavelength dependence of nanosecond laser induced surface damage in fused silica from 260 to 1550 nm

Beam diameter dependence of surface damage threshold of fused silica fibers and preforms for nanosecond laser treatment at 1064nm wavelength

Three-Dimensional Modification in Silicon With Infrared Nanosecond Laser

Analysis of output surface damage resulting from single 351 nm, 3 ns pulses on sub-nanosecond laser conditioned KD 2 PO 4 crystals

Influence of Technological Parameters on Nanosecond Laser-Induced Surface Damage of Optical Multimode Fibers

Nanosecond laser-induced surface damage and material failure mechanism of single crystal CaF2 (111) at 355 nm