Structure of axial modes of a diode laser with an external cavity containing a volume phase grating

Based on the technique using translation matrices, the complex frequencies of the axial modes of a diode laser with an external cavity containing a phase grating were calculated. The calculation results are in good agreement with previously obtained experimental results. The proposed technique makes it possible to predictably determine the spectral behavior of near-threshold lasing for complex multimirror cavities with different sets of parameters.