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\micro and a peak to peak height of \approx0.1\micro have been formed on fused silica substrates. The guiding medium was polyurethane doped with Rhodamine 6G and the laser was pumped by a N 2 laser.