Abstract

From recent studies on CPM dye lasers, it was verified that the most important thing to generate pulses shorter than 100 fsec is to compensate chirping leaded by dispersion and phase modulation due to optical elements composing of the laser cavity. Dietel et al. produced pulses shorter than 6 0 fsec by the adjustment of the optical path of a positive dispersion prism-glass in the cavity for compensation of down-chirping, while Valdmanis et al. recently have produced pulses as short as 27 fsec by the adjustment of the distance between prisms causing negative cavity dispersion for compensation of up-chirping. Consequently, the former conclusion that down-chirp is dominant in the CPM laser is contrary to the latter one that up-chirp is dominant. In addition, both the cavity configurations are complicated for optical alingment and experimental estimation of dispersion proper to the CPM laser because of the additional insertion of one or four prisms leading to negative cavity dispersion.

© 1986 Optical Society of America