65-femtosecond pulse generation from a synchronously pumped dye laser without a colliding-pulse mode-locking technique

Optical pulses as short as 65 fsec have been successfully generated from a synchronously pumped dye laser that does not employ a colliding pulse mode-locking technique. The laser consists of a linear cavity with two dye jets (a gain jet with R6G and a saturable absorber jet with DODCI and DQOCI) and a four-Brewster-angled-prism sequence. A spatial filter between the pairs of prisms plays an important role in achieving saturable-absorber mode locking around 615 nm. The pulse has a spectral width of 8.0 nm, and the average power is 100 mW at a repetition rate of 76 MHz for a pump power of 1.2 W at 532 nm.