Generation of the Mid-IR ultra-short pulses using PPMgLN
Many stretch vibration modes of covalent bonds which include hydrogen atoms lie in the mid infrared region from 2.5 um to 4.0 um. Those vibrations are known to transit in the order of 100 fs. Therefore, femto-second pulses are desired for ultra-fast time-resolved spectroscopy and control of the vibrations which compose biologic materials. We are performing the generation of the mid infrared femto pulses for its application to mid infrared time-resolved spectroscopy. Pulses genarated in titanium doped sapphire regerative amplifier are converted into the mid infrared ones via optical parametric amplification by periodically poled magnesium-oxide-doped lithium niobete. We have succeeded in generating pulses at 3.6 um range which are 57 fs in duration with 450 nm of spectral width. The figure below shows the spectrum of the pulse.
