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The thermo-optical distortions of the active element (Nd:YVO4) of the axially-diode pumped solid-state laser at various methods of the element bonding have been investigated. The mathematical model of computation of optical power of the thermal lens arising in axially pumped crystal was developed and experimentally tested. A quality of output radiation of the axially-diode pumped solid-state laser at various methods and its bonding was investigated. The investigations were realized by means of Hartmann method. The calculated results are in good agreement with experimental data.