| Abstract: | The reflecting properties of the Fizeau interferometer are used to obtain efficient spectral condensation and tuning of short pulse dye lasers. It is pointed out that the formation of multibeam interference fringes with a divergent beam leads to angular dispersion and resurgence of a part of the beam outside the impact area, which can be used to obtain selective feedback in a laser cavity. With a single Fizeau wedge used as a mirror in a 2 ns pulse laser, a linewidth of 0.01 nm is obtained and the tuning range is of the order of 10 nm. The Fizeau wedge mirror also permits an easy switch from a broadband laser emission to a tunable narrow line or to a tunable narrow hole in a broadband laser spectrum. |
