Frequency-Tunable Transform-Limited Picosecond Dye-Laser Pulses

Abstract
Picosecond pulses of transform‐limited durations (Δt∼3 psec; ΔtΔν∼0.5) have been obtained from a passively mode‐locked Rhodamine 6G dye laser, frequency tuned over a range of 230 Å with an intracavity Fabry‐Perot filter. Self‐phase‐modulation frequency broadening at higher powers has also been measured giving a value n2 = 10−18 cm2V−2 for the nonlinear refractive index of the ethanol dye solvent.