Abstract
Using the time-dependent theory, we calculate the random-laser emission
spectra in a two-dimensional strongly disordered medium. The calculation results
show that in low dimensional systems, such as thinfilm disordered media and planar
waveguides, the larger the difference of the refractive indices between the
scattering and background media, the smaller the lasing threshold. We also reveal
the existence of multimode survival and mode competition. We experimentally obtain
the emission spectra of a dye solution with Al particles doped at different pumping
energies, and the experimental results agree well with the calculated ones.
© 2012 Chinese Optics Letters
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