Abstract
We demonstrate a simple method to control the spectrum and to generate synchronized dual-wavelength pulses in a mode-locked Ti:sapphire laser by adjusting the cavity dispersion, without involving more complicated coupled cavities or two-slit systems. We explore the tunability range of our system, and demonstrate the possibility of obtaining pairs of synchronized pulses with adjustable frequency difference. Furthermore, we use this laser to obtain tri-wavelength pulses in the blue range of the spectrum, via second-order nonlinear processes in an LBO crystal. This system may become a useful tool for femtosecond coherent anti-Stokes Raman spectroscopy, and other applications as well.
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