Thermische Resonatoreffekte in organischen Farbstofflasern / Thermal Resonator Effects in Oiganis Dye Lasers

Abstract

Abstract Thermal resonator effects are studied in laser pumped organic dye lasers with the longitudinal pumping arrangement. If the distribution of the pump light is a Gaussion, a diverging lens is induced by the thermal gradient in the dye solution. This thermal lens was compensated by using a suitable resonator set-up with an adjustable telescope. Divergence and bandwidth of the tunable laser were reduced considerably by using the proper compensation. If the angular position of the pump beam is shifted, the axes of laser resonator and thermal lens are different, causing beam deflection and wavelength shifting of the output laser beam. Therefore, high stability and mode purity of the pump laser is important to get a well defined output laser beam.