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The method of compressive sensing is applied to moving source data created by simulation to estimate the mode wavenumbers, mode depth functions and mode amplitudes without any environmental acoustic information, such as sound speed profile or bottom properties. The method needs in principle only data covering a short range span and is thus applicable to a range-dependent environment to estimate the...
We studied instabilities in two-mode He-Ne laser generation during half an hour after laser switching-on. We used Wollaston prism, polarizer, collecting lens and microscope in our observations. The pattern observed was a mix of two interference patterns created by the two laser modes. Instability was shown up as alternating appearance of two contrary patterns. Pattern replacement was realized through...
The paper considers pulse propagation in a transverse inhomogeneous waveguide supporting a quasi-TEM wave. The calculation is based on presenting the sought fields in terms of mode expansion with mode amplitudes being functions of time and longitudinal coordinate (Mode Basis Method). In case of transverse inhomogeneous waveguide there is coupling between the modes. Meanwhile a very good convergence...
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