We demonstrate the multiparametric monitoring of directional bending, torsion, and temperature based on helical long-period gratings (HLPGs) in a triangular four-core fiber (FCF) using CO 2 laser i…
We demonstrate a new method for measuring the stimulated emission cross-section ( $\sigma _{s}$ ) of laser crystals for high-power solid-state lasers at working state using the relaxation oscillati…