An 115 W Yb:YAG planar waveguide laser fabricated via pulsed laser deposition

Abstract

: We present details of the homo-epitaxial growth of Yb:YAG onto a <100> oriented YAG substrate by pulsed laser deposition. Material characterization and initial laser experiments are also reported, including the demonstration of laser action from the 15 µm-thick planar waveguide generating 11.5 W of output power with a slope efficiency of 48 %. This work indicates that under appropriate conditions, high-quality single-crystal Yb:YAG growth via pulsed laser deposition is achievable with characteristics comparable to those obtained via conventional crystal growth techniques.

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

“…As a mature physical vapor deposition process, pulsed laser deposition (PLD) is actually a relatively simple technology, and a detailed description of the setup we have used can be found in reference [6]. However, as a brief summary, PLD starts with a high-energy pulsed UV laser being focused onto a target in a controlled low-pressure background gas environment and the resulting plasma-plume propagates across the chamber and is deposited onto a heated substrate, as shown in Fig 1. Optimized growth of the desired crystal film nominally occurs when the substrate temperature is approximately half of the growing crystal's melting point.…”

Use of laser ablation for formation of discontinuous (discrete) wear-resistant coatings formed on solid carbide cutting tool by electron beam alloying and vacuum-arc deposition

“…The laser ablation of the coatings was performed using the laser-machining center equipped with the solidstate pulsed optical fiber Laser 600 GF by Agie Charmilles with the output power of 50 W and the pulse length of 90 ns [20][21][22].…”

Er:YGG Planar Waveguide Amplifiers for LIDAR Applications

“…Crystal growth was conducted using the same pulsed laser deposition apparatus discussed in detail in [2]. A 248 nm KrF laser was focused onto a pressed ceramic target with a fluence of 1.1 J/cm 2 .…”

“…This diode was launched via proximity coupling of the single-mode fiber to the polished waveguide facet, with a multimode (Ø=62.5 µm, 0.22 NA) fiber placed orthogonal to the plane of the waveguide used to collect fluorescence and deliver it to the OSA. As previously discussed [2], this measurement geometry allows for collection of fluorescence from a small area of the waveguide and minimizes the effect of reabsorption on the fluorescence spectrum. A calculation of the emission cross section for Er:YGG was made using the Füchtbauer-Ladenburg equation.…”