Electric field detection of phase-locked near-infrared pulses using photoconductive antenna.
We have demonstrated that a photoconductive antenna gated with 5-fs ultrashort laser pulses can detect electric field transients of near-infrared pulses at least up to 180 THz. Measured sensitivity spectrum of the antenna shows a good agreement with a simple calculation, demonstrating the promising capability of the antenna to near infrared spectroscopy. Using this setup, near-infrared time-domain spectroscopy and characterization of phase controlled near-infrared pulses are demonstrated. Observed absorption spectrum of a polystyrene film and complex refractive index dispersion of a fused silica plate both agree well with those obtained by the conventional methods.
Graduate School of Engineering, Yokohama National University, Yokohama, Kanagawa 240-8501, Japan. katayama@ynu.ac.jp
I
I
Katayama
R
R
Akai
M
M
Bito
E
E
Matsubara
M
M
Ashida
D004574:Electromagnetic Fields; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007259:Infrared Rays; D011874:Radiometry / Q000295:instrumentation*; D019265:Spectroscopy, Near-Infrared / Q000295:instrumentation*; D020349:Surface Plasmon Resonance / Q000295:instrumentation*; D014159:Transducers