• Shift and broadening of emission lines in Nd$^{3+}$:YAG laser crystal influenced by input energy

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    • Keywords


      Nd$^{3+}$:YAG crystal; heat generation; three-level emission lines; four-level emission lines; input energy.

    • Abstract


      Spectroscopic properties of the flashlamp-pumped Nd$^{3+}$:YAG laser as a function of input energy were studied over the range of 18–75 J. The spectral widths and shifts of quasi-three-level and four-level inter-Stark emissions within the respective intermanifold transitions of $^4$F$_{3/2}$ $\rightarrow$ $^{4}$I$_{9/2} $ and $^{4}$F$_{3/2}$ $\rightarrow$ $^{4}$I$_{11/2}$ were investigated. The emission lines of $^{4}$F$_{3/2}$ $\rightarrow$ $^{4}$I$_{9/2}$ shifted towards longer wavelength (red shift) and broadened, while the positions and linewidths of the $^{4}$F$_{3/2}$ $\rightarrow$ $^{4}$I$_{11/2}$ transition lines remained constant by increasing the pumping energy. This is attributed to the thermal population as well as one-phonon and multiphonon emission processes in the ground state. This phenomenon degrades the output performance of the lasers.

    • Author Affiliations



      1. Department of Optics and Laser Engineering, Estahban Branch, Islamic Azad University, Estahban, Iran
      2. Department of Physics, College of Sciences, Yasouj University, Yasouj, 75914-353, Iran
    • Dates

  • Pramana – Journal of Physics | News

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