Laser optical system forming pulsed light beam - has Pockel cell oscillator between resonant mirrors and in line with quarter wave plate and linear polariser

摘要

The laser optical system consists of a laser optical element (6) with its optical axis coincident with an opaque resonating mirror (2) on one side and, on the other side, a quarter-wave plate (5), a linear polariser (4), a laser-active medium (1) and a partly transparent resonating mirror (3). The laser active medium (1) is typically an Nd glass or Nd doped YAG crystal, the linear polarisium is of calcite and the quarter-wave plate of quartz. The laser optical element is constructed as a Pockel cell with side electrodes and a central KDP crystal. (Potassium-dihydrogen-phosphate). The cell has an electrical voltage applied to cause it to function as an oscillator and emit pulses of laser light for the irradiation of solid or liquid materials.