Threshold gain properties of lasing modes in ID disordered media optically pumped by femtosecond-lasing pulse

Yong LIU, Jinsong LIU

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PDF(162 KB)
Front. Optoelectron. ›› 2011, Vol. 4 ›› Issue (4) : 387-392. DOI: 10.1007/s12200-011-0213-2
RESEARCH ARTICLE
RESEARCH ARTICLE

Threshold gain properties of lasing modes in ID disordered media optically pumped by femtosecond-lasing pulse

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Abstract

By numerically solving Maxwell’s equations and rate equations, a comprehensive calculation on spectrum intensity and spectral widths of three localized modes via different pumping rates in one-dimensional (1D) disordered medium is investigated, in which pumping rate is described by a time function with duration of 80 fs. The spectral intensities varying with the peak value of femtosecond (fs) pumping pulse are calculated in the same disordered medium, and the calculated spectral intensities are compared with those with fixed pumping (simulation time is 6 ps). These results show that excited modes with fs pulse pumping rates are only slightly different from those with fixed pumping (picosecond (ps) pulse), which suggests the excited modes largely depend on the medium rather than the pumping rate at least for those of which pumping rates are fs and ps. At last, lifetimes of three excited modes are calculated. It is found that there is a certain corresponding relation between the mode’s lifetime and its threshold-pumping rate, which is the longer lifetime with lower threshold.

Keywords

one-dimensional (1D) disordered medium / lasing pumping rates / localized modes

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Yong LIU, Jinsong LIU. Threshold gain properties of lasing modes in ID disordered media optically pumped by femtosecond-lasing pulse. Front Optoelec Chin, 2011, 4(4): 387‒392 https://doi.org/10.1007/s12200-011-0213-2

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 60778003 and 60378001).

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg
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