Institution: | aIntel Corporation, 2200 Mission College Blvd, Santa Clara, CA 95054, USA bDepartment of Physics, Auburn University, AL 36849, USA cTata Institute of Fundamental Research, 1 Homi Bhabha Road, Mumbai 400 005, India |
Abstract: | Single-crystal thin-film of an organic second-order nonlinear optical material, 4-aminobenzophenone (ABP), is used to measure the pulsewidth of a Ti-Sapphire laser producing 45 fs pulses at 1 kHz repetition rate, by the non-collinear second-harmonic generation (SHG) intensity autocorrelation technique. These films are suitable for measurements over a broad wavelength range, down to 780 nm, due to their wide optical transparency. The single-crystal film with thickness ( 3 μm) less than the coherence length requires no phase-matching for efficient broadband SHG. Pulse walk-off due to group-velocity mismatch (GVM) and temporal broadening of the pulses due to group-velocity dispersion (GVD) are found to be negligible. These effects have been estimated for pulse width down to few-cycle pulses ( 10 fs), and the analyses show that these films can be used to characterize such ultrashort optical pulses. |