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Books > Professional & Technical > Mechanical engineering & materials > Materials science
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Spectroscopic Properties of an Nd - YAG Laser Pumped by a Flashlamp at Various Temperatures and Input Energies (Paperback)
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Spectroscopic Properties of an Nd - YAG Laser Pumped by a Flashlamp at Various Temperatures and Input Energies (Paperback)
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The purpose of this book was to investigate the temperature and
input energy dependency of Nd:YAG laser performance pumped by
flashlamp. A commercial laser rod Nd:YAG laser crystal was utilized
as a gain medium. The laser rod was placed parallel to a linear
flashlamp filled by xenon gas at 450 Torr. The Nd:YAG crystal
together with the flashlamp was flooded with a coolant comprising
of a mixture with 60% ethylene glycol and 40% distilled water,
which covers a range of temperature from -30oC to +60oC.
Spectroscopic properties of the Nd:YAG rod under pulsed flashlamp
pumping was investigated from the output fluorescence spectrum of
the flashlamp radiation and the Nd:YAG rod. The linewidth of each
fluorescence line was measured for an estimation of an effective
emission cross section and saturation intensity. The influence of
temperature and input energy on a fluorescence emission cross
section of Nd3+:YAG crystal was studied. The cross-section was
found to decrease as the temperature and the input energy was
increased. The inter-stark emission showed a Lorentzian line shape
indicating homogeneous broadening. This was attributed to the
thermal broadening mechanism of the emission line. The spectral
widths and shifts of the emission lines for the three and four
level inter-Stark transitions within the respective intermanifold
transitions of 4F3/2 4I9/2 and 4F3/2 4I11/2 were investigated over
the range of 0 to 75 J. The emission lines for the 4F3/2 4I9/2
transitions shifted towards a longer wavelength and broadened,
while the positions and linewidths for the 4F3/2 4I11/2 transitions
remained unchanged with the increase of input energy. Finally, the
temperature dependence of quasi-three-level laser transitions for
long pulse Nd:YAG laser was also investigated. The laser
performances at both 938.5 nm and 946.0 nm were also found to be
inversely proportional to temperature, and the slope efficiency was
unchanged with temperature. The reduction was due to the mechanism
of phonon scattering as well as a broadening effect while the
temperature increased.
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