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

Abstract

.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.

Unveiling sub-bandgap energy-level structures on machined optical surfaces based on weak photo-luminescence

“…33,34 Therefore, regulating, suppressing and even eliminating SDELs are promising ways to effectively improve the LIDTs of fused silica optical elements and resultantly promote the advances of these fields. 46,47 Therefore, this work provides a novel approach to characterize the SDELs on machined fused silica surfaces. On the basis of this, this work provides a convenient method for raising the LIDTs of fused silica optical elements through monitoring, suppressing and even eliminating the SDELs on machined fused silica surfaces.…”

“…36,37,39 Recently, only the laser damage test method could be used to obtain the LIDTs of fused silica optical elements. 46,47 However, it would damage these expensive fused silica optical elements. 46,47 Moreover, the prediction model of the LIDT of the optical surface is also considered as an excellent tool to describe the laser-induced damage initiation process and reveal its internal physical mechanisms.…”

“…46,47 However, it would damage these expensive fused silica optical elements. 46,47 Moreover, the prediction model of the LIDT of the optical surface is also considered as an excellent tool to describe the laser-induced damage initiation process and reveal its internal physical mechanisms. Therefore, developing a method that can precisely predict the LIDTs of fused silica optical elements is urgently needed to assist in testing the LIDTs of these expensive fused silica optical elements in industrial production.…”