Abstract
The variations in pulse shape of a single-mode pulse laser propagating through ytterbium (Yb) atomic medium were investigated experimentally. The laser pulse shape was changed as a function of pulse area and it could be explained well using the area theorem. When the pulse area was close to 2π, the pulse shape was transformed to a hyperbolic secant function after transmission. The transmission curve of the propagating laser vs. the pulse area demonstrated self-induced transparency phenomena well. However, the transmission was markedly reduced when the atomic density was increased above ∼4×1010 atoms/cm3. Several causes; such as collision-induced polarization relaxation, Doppler broadening, laser incoherence, and power broadening, which could induce reduced transmission, were examined. It was the incoherence of the laser that caused reduced transmission because the laser line width was broader than the Fourier-transform limit, and the absorbed energy dissipated through spontaneous emission.
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