2. Evaluation of threshold of forming a channel.

   For the evaluation of threshold of forming a channel will use same model , brushed off that section (I) leaves on the free surface of liquid. However, in this case sensibly consider that in the section (I) forces of the surface tension do not act, as far as curvatures of surface on the edge of the educated trough have different signs on the ortogonal  directions and values of one order. So possible consider that threshold(accurate to hydrosteady-state adjustment) is defined by possibility to compensate pressure of return of vapours by the surface tension of hemisphere whith diameter:

                                           (5)
Thence for  diameter limit a heel of focusing of radiating on surfaces

                    (6)

Value also limit density of power, required for forming a channel:

                (7)

For conditions of experiment at the temperature 100° C will have:

 , = 0.25sm .


                           3. Dependencies of depth of channel from the focal length of lens.

    In contempt by absorbing a radiating in channel and its reflection

from walls unambiguous relationship of the bottom diameter  and powers of lazer beam

is indicate, that depth of channel   h   will be define by condition of equality .

This condition gives enough ask correlation of type

                                                                                  (8)

whence will have:

                                                                              (9)