Effect of heating on the optical properties of Yb³⁺-doped fibres and fibre lasers

Holmium fiber laser based on the heavily doped active fiber

“…Thus, the output power was increased from starting value of 1 W to steady-state power of 1.7 W during approximately 6 min. We believe that this effect is connected with a self-heating of the fiber that leads to the ASE suppressing due to a broadening of the absorption band [12].…”

Self-induced laser line sweeping in an ytterbium fiber laser with non-resonant Fabry-Perot cavity

“…A few other interesting observations have been reported recently regarding a trend of an YFL to oscillate at multiple wavelengths [7][8][9][10], in particular in the twowavelength regime [11]. Also mention here the thermal effect that was shown to affect an operation wavelength of an YFL at high pump powers or at increasing temperature [12][13][14]. Closely related to the spectral dynamics of an YFL is the presence in it of non-sustained relaxation instabilities [15][16][17] and self-pulsing oscillation regimes (see e.g.…”

Stimulated Brillouin scattering in Yb3+-doped dual-clad fiber lasers based on the temperature-dependent model

“…Recently optical properties including absorption coefficient, emission cross-section, fluorescence lifetime and slope efficiency of Yb 3+ -doped large mode area (LMA) fiber are experimentally measured for temperatures spanning from 23 • C to 977 • C [7]. Absorption and luminescence spectra of ytterbium ions doped dependence of temperature is studied and the laser wavelength at 1180 nm with lasing efficiency ∼30% at 150 • C are realized in Yb 3+ -doped fiber laser with Bragg gratings [8]. The absorption and luminescence spectra and fluorescence lifetime of Yb ions vary with the temperature initiated by pump powers, hence it is interesting and necessary to study the effect of temperature factor on SBS threshold power in Yb 3+ -doped dual-clad fiber lasers.…”