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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.
Arthurs et al. (Wed,) studied this question.
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