For Oxford, Mass.-based IPG Photonics (IPGP), which makes lasers for a number of industries, growth isn’t coming from lasers used in fat removal or eye surgeries. It’s lasers for materials processing that are seeing particularly solid demand. As Chairman and CEO Dr. Valentin Gapontsev noted during the company’s fourth-quarter conference call, the areas of laser sintering and 3-D printing are experiencing strong growth in particular.