Chang Hee Nam

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AM and FM active mode-locking methods have been utilized to generate high-quality pulse trains at high repetition rate in several laser systems, including semiconductor lasers, and erbium-doped fiber lasers. However, these techniques usually fail to produce pulse trains with long-term stability. Some forms of active stabilization are generally required for(More)
With the advancement of chirped pulse amplification (CPA) and femtosecond Ti:sapphire laser technologies, femtosecond terawatt lasers have been developed and applied to a variety of research fields. Due to their broad gain bandwidth, Ti:sapphire lasers with duration less than 50 fs have been constructed at a terawatt power level by amplifying a femtosecond(More)
With the technical advancement of intense femtosecond lasers, experiments on high-harmonic generation (HHG) have greatly extended its emission wavelength and efficiency. Soft X-rays generated by high-harmonics contain properties similar to a driving laser, like femtosecond time duration and temporal and spatial coherence. The frequencies of soft x-rays(More)
Recent progress in the field of ultrashort-pulse laser technology has made it possible to produce femtosecond pulses of the terawatt power level in a compact size. The laser pulse of extremely high intensity (>10/sup 16/ W/cm/sup 2/) creates plasma by the effect of optical-field ionization (OFI). In the OFI scheme, a plasma consisting of multiply charged(More)
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