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Prof. Konstantin Vodopyanov

CREOL, The College of Optics and Photonics, Univ. Cent. Florida, USA

Wednesday, March 27th, 2013 at 10:00:00 AM  

Conference room Querzoli - LENS - via Nello Carrara 1 - Sesto Fiorentino (Florence)

Published on-line at 01:16:47 PM on Thursday, March 21st, 2013

Producing octave-wide combs and few-cycle pulses in the mid-infrared: frequency divide-and-conquer approach

Frequency combs extension to mid-IR range based on subharmonic optical parametric oscillation.

I will talk about a new technique for extending frequency combs to mid-IR range, based on subharmonic optical parametric oscillation (OPO) - a reverse of second harmonic generation - where the frequency comb of a pump laser is transposed to half its frequency and simultaneously spectrally broadened, thanks to an enormous parametric gain bandwidth at degeneracy. Using ultrafast Er- or Tm-based fiber lasers as a pump, with properly managed intracavity dispersion, we produce octave-wide frequency combs in the 2.5-6 micron range with up to 40% quantum efficiency. The frequency comb is phase-locked to the pump laser and has intriguing coherence properties.

I will also talk about applications of our mid-IR frequency combs to trace gas molecular detection.

For further informations, please contact Prof. Paolo De Natale.