Abstract
Ultrashort pulse characterization techniques based on second harmonic generation (SHG), such as frequency resolved optical gating (SH-FROG), were developed for the near infrared and cannot be easily transposed to the UV and the visible because of the lack of suited and efficient non linear crystals for broadband SHG. Such difficulties can be overcome by the use of a third order non linear effect such as induced birefringence which is achromatic and frequency conserving. However, third order non linear effects usually require non collinear geometry in order to be able to extract the useful signal, which greatly increases the complexity of the system. Conversely, a single-beam geometry would greatly simplify the optical setup but comes at the expense of an interferometric control of the delay between pulses replicas and signal discrimination.
© 2007 IEEE
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