A noncollinear optical parametric amplifier is presented that generates transform-limited sub-10-fs pulses that are tunable in both the visible and the near infrared (NIR). The pulse-front-matched pump geometry realizes tilt-free signal amplification, and pulses as short as 6.1 fs can be obtained from 550 to 700 nm. The large angular dispersion of the idler specific to the group-velocity-matching interaction is effectively eliminated by a grating–telescope compensator, and 9-fs NIR pulses are also successfully obtained from 900 to 1300 nm. This is believed to be the first tunable sub-10-fs light source.
© 1998 Optical Society of America
Akira Shirakawa, Isao Sakane, and Takayoshi Kobayashi, "Pulse-front-matched optical parametric amplification for sub-10-fs pulse generation tunable in the visible and near infrared," Opt. Lett. 23, 1292-1294 (1998)