Nd: yag laser is a four-level laser system, which means that the four energy levels are involved in laser action. these lasers operate in both pulsed and continuous mode. nd: yag laser generates laser light commonly in the near-infrared region of the spectrum at 1064 nanometers (nm).. Working of nd:yag laser. it is a 4 level systems i.e.; it contains 4 energy levels. so, in this section, we will discuss the working of nd:yag laser with the help of the energy level diagram. the figure below shows the 4 state energy level diagram of nd:yag laser: here, e 1 is the lowest energy state while e 4 is the highest energy level..
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