Abstract

The white-light continuum generated by ultrashort laser pulses focused in solid or liquid is a very useful ultrafast, broadband light source. However, the energy of the white light far from the excitation laser wavelength is normally insufficient for many spectroscopic applications. Furthermore, continuous selection of a narrow band of wavelengths from the continuum while maintaining the femtosecond pulse width is rather difficult, and only few investigations in this area have been reported.¹ In this report widely tunable (350-590 nm) femtosecond pulses from with pulse energies as high as the microjoule level, demonstrated by using a frequency-mixing technique to upconvert the red and near-IR region of a white-light continuum.

© 1995 Optical Society of America