Numerical simulation of pyramdal tip entirely coated with Ag film with focusing spot at nanometer scale;

By applying the numerical simulation technology,it makes the optimization process for light beam heating parameters more efficient and economic.

The technology of acquiring precise modified layer on construction material surface by light beam cladding was investigated and its effect on cladding layer quality was revealed.

In simulation of focused beam propagation with arbitrary focal length, the traditional beam propagation algorithm based on Fast Fourier Transform will fail to give right results due to the limitation of the sampling theorem.