Laser drilling: Energy partitioning

Abstract

A previously developed 1-D transient laser drilling model with variable properties is used to investigate energy partitioning during laser drilling. Energy conservation within the model is monitored by calculating the energy reflected, Er, the energy loss due to convection and radiation at the boundaries, Eloss, the energy storage, Eg, energy removal by vaporization, Ev, and energy removal by liquid expulsion, El at each time step. These energies sum up to the total incident energy from the laser, Elaser. The energy balance is satisfied with less than 0.1% error. Using the energy balance calculation, we can predict how and where the energy is dissipated at each time step. Results for Rayleigh and top hat laser pulses are presented and discussed.A previously developed 1-D transient laser drilling model with variable properties is used to investigate energy partitioning during laser drilling. Energy conservation within the model is monitored by calculating the energy reflected, Er, the energy loss due to convection and radiation at the boundaries, Eloss, the energy storage, Eg, energy removal by vaporization, Ev, and energy removal by liquid expulsion, El at each time step. These energies sum up to the total incident energy from the laser, Elaser. The energy balance is satisfied with less than 0.1% error. Using the energy balance calculation, we can predict how and where the energy is dissipated at each time step. Results for Rayleigh and top hat laser pulses are presented and discussed.