Laser induced damage threshold of optical fibers under ns pulses

Vanda, Jan; Muresan, Mihai-George; Bilek, Vojtech; Sebek, Matej; Hanuš, Martin; Lucianetti, Antonio; Rostohar, Danijela; Mocek, Tomáš

doi:10.1117/12.2245040

Cited by 2 publications

(2 citation statements)

References 3 publications

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“…High-purity silica optical fibers are widely used for the beam delivery in laser technology, mostly for the compact and powerful laser system designs. 1,2 In these systems, optical fibers make the laser propagation stable and decrease the costs of delivery and maintenance. However, the input power of optical fibers is limited for the laser-induced damage.…”

Section: Introductionmentioning

confidence: 99%

Laser-induced damage threshold based on thermal effects in high-purity silica optical fiber

Lou

Jia

et al. 2023

Opt. Eng.

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.Laser-induced damage threshold (LIDT) is investigated at several wavelengths in the high-purity silica optical fiber. The finite element method (FEM) is used to study transmission mode, LIDT, temperature distribution, and thermal stress distribution of the fiber. Our results show that the center of the front surface is subjected to severe thermal effects under laser irradiation and consequently, and it is susceptible damage. The variations in temperature and thermal stress are identified as increasing with laser fluences, which show a similar tendency. When laser fluences surpass the LIDT, such as 35 GW / cm2, the temperature at the front surface center shows a sudden growth and the melting damage appears, and no stress damage occurs at this time. Notably, the melting effect of high purity fused silica optical fiber is simulated by numerical calculation based on ray optics for the first time. Our research can provide systematic FEM simulations for the LIDT of silica optical fibers.

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Section: Introductionmentioning

confidence: 99%

Laser-induced damage threshold based on thermal effects in high-purity silica optical fiber

Lou

Jia

et al. 2023

Opt. Eng.

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“…Hence, the most common matrix for the fabrication of such sources is silica. It is characterized by a significant damage threshold of 0.2 J/cm 2 at 1550 nm and low attenuation up to the spectral range of about 2.2 µm [16][17][18][19]. Production of silica optical fibers, due to high processing temperatures (softening point above 1700 • C), doping of silica is limited to inorganic compounds only.…”

Section: Introductionmentioning

confidence: 99%

Broadband Profiled Eye-Safe Emission of LMA Silica Fiber Doped with Tm3+/Ho3+ Ions

Miluski,

Markowski,

Kochanowicz

et al. 2023

Materials

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LMA (Large Mode Area) optical fibers are presently under active investigation to explore their potential for generating laser action or broadband emission directly within the optical fiber structure. Additionally, a wide mode profile significantly reduces the power distribution density in the fiber cross-section, minimizing the power density, photodegradation, or thermal damage. Multi-stage deposition in the MCVD-CDT system was used to obtain the structural doping profile of the LMA fiber multi-ring core doped with Tm3+ and Tm3+/Ho3+ layer profiles. The low alumina content (Al2O3: 0.03wt%) results in low refractive index modification. The maximum concentrations of the lanthanide oxides were Tm2O3: 0.18wt % and Ho2O3: 0.15wt%. The double-clad construction of optical fiber with emission spectra in the eye-safe spectral range of (1.55–2.10 µm). The calculated LP01 Mode Field Diameter (MFD) was 69.7 µm (@ 2000 nm, and 1/e of maximum intensity), which confirms LMA fundamental mode guiding conditions. The FWHM and λmax vs. fiber length are presented and analyzed as a luminescence profile modification. The proposed structured optical fiber with a ring core can be used in new broadband optical radiation source designs.

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Laser induced damage threshold of optical fibers under ns pulses

Cited by 2 publications

References 3 publications

Laser-induced damage threshold based on thermal effects in high-purity silica optical fiber

Laser-induced damage threshold based on thermal effects in high-purity silica optical fiber

Broadband Profiled Eye-Safe Emission of LMA Silica Fiber Doped with Tm3+/Ho3+ Ions

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