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

Pramana

POURMAND SEYED EBRAHIM1¹  REZAEI GHASEM² 

[1] Department of Optics and Laser Engineering, Estahban Branch, Islamic Azad University, Estahban, Iran$$;Department of Physics, College of Sciences, Yasouj University, Yasouj, 75914-353, Iran$$

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

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

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$_{3/2}$ $ightarrow$ $^{4}$I$_{9/2} $ and $^{4}$F$_{3/2}$ $ightarrow$ $^{4}$I$_{11/2}$ were investigated. The emission lines of $^{4}$F$_{3/2}$ $ightarrow$ $^{4}$I$_{9/2}$ shifted towards longer wavelength (red shift) and broadened, while the positions and linewidths of the $^{4}$F$_{3/2}$ $ightarrow$ $^{4}$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.

【 授权许可】

Unknown