The recent progress in the development of few-cycle laser pulses with passively stabilized carrier-envelope phase (CEP) at SIOM is reported. A three-stage high conversion efficiency optical parametric amplifier (OPA) with passively stabilized carrier-envelope phase is shown. After passing through an argon-filled hollow fiber and the dispersion compensator for pulse compression, CEP stabilized 0.7 mJ, 1.5 cycle laser pulses at 1.75μm center wavelength are obtained. Applications of the laser system in high order harmonic generation leading to the short wavelength supercontinuum emission and the terahertz (THz) generation with a pronounced CEP dependence will be discussed. THz emission spectroscopy is adopted also to determine the value of CEP, indicating an excellent long-term CEP stability.
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