88 Advanced Manufacturing and Processing Technology
4.3.5 LASER BEAM MICROMACHINING
Laser beam micromachining (LBMM) is one of the advanced machining meth-
ods that utilizes the energy from high-velocity coherent photon beam. The energy
released from the photon beam is focused on the target spot, which is transformed
into thermal energy to perform machining. The term LASER named as light ampli-
cation by stimulated emission of radiation. In 1917, Albert Einstein depicted the
relationship between the wavelength of light and atomic energy levels. With the
help of this work, the concept of simultaneous and stimulated emission was devel-
oped. T.H. Maiman invented the Ruby laser with the support of Einstein’s theory ...