Abstract
We present results of the spectral filtering properties of volume gain gratings and their role as diffractive optical elements in the spectral evolution of holographic laser oscillators. We show that the gain grating acts as a spectral filter with a filter bandwidth that is approximately inversely proportional to the medium length. We investigate holographic laser oscillators and find that, when either the gain grating is written by monochromatic radiation or when it is initiated from broad-band radiation, the output of such oscillators can evolve to single longitudinal mode in correspondence to experimental observations.
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