Pulsed laser deposited diode-pumped 74 W Yb:Lu_2O_3 planar waveguide laser

Abstract

Abstract:Fabrication, characterization, and laser performance of an Yb:Lu 2 O 3 planar waveguide laser are reported. Pulsed laser deposition was employed to grow an 8 µm-thick Yb-doped lutetia waveguide on a YAG substrate. X-ray diffraction was used to determine the crystallinity, and spectroscopic characterization showed the absorption and emission cross-sections were indistinguishable from those reported for bulk material. When end-pumped by a diode-laser bar an output power of 7.4 W was achieved, limited by the available pump power, at a wavelength of 1033 nm and a slope efficiency of 38% with respect to the absorbed pump power.

Er:YGG planar waveguides grown by pulsed laser deposition for LIDAR applications

“…We use ceramic targets, which have lower ablation thresholds than single crystals and also cater for tailoring the composition of the target to control the grown crystal's stoichiometry [7]. With this approach, we have studied the growth of a wide range of oxides, including garnets [7] and sesquioxides [8], with the eventual aim of engineering the refractive-index profile and the spectroscopic properties on the sub-micron level. Two different KrF excimer lasers (Coherent -COMPexPRO) were utilized for growing the various garnet films, operating at repetition rates of 20 Hz or 100 Hz, the latter leading to ~20 m/hour growth rates.…”

“…Insertion-loss measurements (without pump) were taken at seven different wavelengths across the C-and L-bands and were used, along with the calculated spectroscopy for the Er:YGG (uncompensated film) in Fig. 4, to determine the background insertion loss (the insertion loss of the guide in the absence of absorption) and the dopant concentration in a manner similar to that reported by Parsonage et al [8]. The results for the 9-m-thick Er:YGG waveguide are displayed in Fig.…”

Er:YGG Planar Waveguide Amplifiers for LIDAR Applications

“…These measurements were used along with the calculated spectroscopy from Fig. 1, to calculate the background insertion loss (the insertion loss of the guide in the absence of absorption) and the dopant concentration in a manner similar to that reported by Parsonage et al [5]. The results from these measurements and the fit to this data are displayed in Fig.…”

Laser Performance of Yb-doped-Garnet Thin Films Grown by Pulsed Laser Deposition

“…This reduces the ablation threshold sufficiently to allow for the effective use of KrF excimer lasers at 248 nm. Using this technique, we have studied the growth of a wide range of oxides including garnets [1], and cubic sesquioxides [2], with the eventual aim of being able to tailor refractive index and spectroscopic properties on the sub-micron level while alleviating some of the detrimental effects that typically occur for mixed materials e.g. reduced thermal conductivity.…”