Comparative investigation of diode-wing-pumped Tm:Y3Al5O12 laser between composite and non-composite crystal

• We experimentally investigated the performance of diode-wing-pumped Tm:YAG laser.
• We compared the laser performance between composite and non-composite crystals.
• We compared laser spectra features between composite and non-composite crystals.
• Red-shift of the laser spectra was experimentally observed.
• Power scaling can be realized by using composite crystal with short doped segment.

We experimentally investigated the performance of diode-wing-pumped Tm:Y3Al5O12 crystalline laser operating at around 2 μm. By systematically making comparisons of laser performance in addition to the laser spectra features between composite and non-composite crystals with two different active segments length, we believed that using diffusion-bonded crystal with shorter Tm3+-doped active segment would be a feasible approach for simultaneously up-scaling the output power and slope efficiency in terms of reducing the reabsorption loss and thermal lensing effects.