Assistant Researcher
Wei-Jan Chen

Updated on September 7, 2009
From 2003, my research interest is how to control molecular motion by high resolution laser. We generate high order Raman sidebands by EIT-like (electromagnetically induced transparency) process. By selecting two fixed different wavelength lasers and controlling the timing of these two lasers, the high order Raman sidebands generation will be maintained in adiabatic process which can induce high wavelength conversion efficiency. The Raman sideband spectrums expand from IR to deep-UV. This is a good coherent light source for laser spectroscopy.
The phases of these Raman sidebands are fixed to each other. It is a good light source for generating ultrashort optical pulse. From 2005, I devote myself to generate attosecond pulse. By using homemade liquid crystal SLM as the phase modulator, we synthesize a train of pulses that are 0.83 cycles long and have an electric field pulse width of 0.44 fs. The characteristics of this pulse are that the CEP (carrier-envelope-phase) of these pulses is fixed and the central wavelength is in optical range.
The attosecond optical pulse can be used to probe the electron motion in atom, the wave function of molecular vibration, the motion of bonding electron in molecule, and the electron dynamics in nanostructures. The generation and application of attosecond pulse and optical arbitrary waveform are my research interest.