|
Publications
|
|
||
| |
||
|
||
| ||
|
|
"Achromatic second harmonic generation: tunable ultraviolet pulses with sub-10 fs duration" P. Baum, S. Lochbrunner, and E. RiedleUltrafast Phenomena XIV, T. Kobayashi, T. Okada, T. Kobayashi, K. Nelson, S. De Silvestri, eds. (Springer-Verlag, Berlin, 2005), 79 - 81 Abstract: Tunable ultraviolet (UV) pulses shorter than 10 fs are generated by achromatic frequency doubling the output of a noncollinear optical parametric amplifier. We achieve first and second order achromatic phase matching with a suitable two-prism sequence and thereby increase the natural bandwidth of the nonlinear crystal by a factor of 80. Extremely broad UV spectra with a Fourier limit of 2.9 fs are generated in a 360 µm thick BBO crystal at a conversion efficiency of 20 %. The angular dispersion and the first order chirp of the highly stable UV pulses is compensated with a second prism sequence. By controlling the higher order chirp with a deformable mirror we generate pulses as short as 7.1 fs. BMO authors (in alphabetic order): Peter Baum Stefan Lochbrunner Eberhard Riedle |