Tunable DFB laser with fan-shaped grating

Abstract

Fan‐shaped grating whose period is continuously varied from 1950 to 2020 Å has been fabricated on the glass substrate by the holographic technique using photoresist and twisted mirrors and subsequent reactive sputter etching. A N₂ laser pumped thin‐film dye laser has been constructed with dye‐doped polyurethane film coated on the glass substrate which has the fan‐shaped‐grating corrugation on its surface. It has been able to generate the laser light of the wavelength ranging from 5861 to 6071 Å.