Thin film distributed feedback laser fabricated by ion milling

Distributed feedback lasing in a thin film optical mode has been produced by a periodic perturbation of the guide height. Using photoresist and ion milling techniques, gratings with a period of\approx0.2\microand a peak to peak height of\approx0.1\microhave been formed on fused silica substrates. The guiding medium was polyurethane doped with Rhodamine 6G and the laser was pumped by a N2laser.