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Q-switched Nd lasers pumped directly into the 4F3/2 emitting level

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Title: Q-switched Nd lasers pumped directly into the 4F3/2 emitting level
Authors: Pavel, N. nicolaie.pavel@inflpr.ro, Dascalu, T.1, Salamu, G.1, Sandu, O.1, Leca, A.1, Lupei, V.1
Source: Optics Communications. Dec2009, Vol. 282 Issue 24, p4749-4754. 6p.
Subjects: Switching theory, Neodymium glass lasers, Optical pumping, Fluorine isotopes, Chromium ions, Wavelengths, Acoustooptics, Solid state physics
Abstract: Abstract: The influence of the direct pumping into the 4F3/2 emitting level on the output characteristics of continuous-wave (CW) pumped, passively or actively (acoustooptic, AO) Q-switched Nd lasers is discussed. In case of passive Q-switching by Cr4+:YAG saturable absorber (SA) crystal, the change of pumping wavelength from 0.81μm into the highly-absorbing 4F5/2 level to 0.88μm into the 4F3/2 level of Nd does not modify the energy of the Q-switch pulse, but increases the pulse repetition rate and the laser average power for the same absorbed pump power. This is demonstrated with 0.81 and 0.88μm CW laser diode-pumped Nd:YAG and Nd-vanadate lasers with average output power in the watt-level range at 1.06μm. The effect is explained by the control of passive Q-switching by the intracavity photon flux that is influenced by the pump wavelength and by the initial transmission of the SA crystal. On the other hand, it is discussed and experimentally proved that due to the possibility to control externally the frequency of switching, in case of the AO Q-switched Nd laser the change of the pump wavelength from 0.81 to 0.88μm increases the pulse energy for a fixed frequency, leading to a corresponding increase of the average laser power. [Copyright &y& Elsevier]
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Database: Engineering Source
Description
Abstract:Abstract: The influence of the direct pumping into the 4F3/2 emitting level on the output characteristics of continuous-wave (CW) pumped, passively or actively (acoustooptic, AO) Q-switched Nd lasers is discussed. In case of passive Q-switching by Cr4+:YAG saturable absorber (SA) crystal, the change of pumping wavelength from 0.81μm into the highly-absorbing 4F5/2 level to 0.88μm into the 4F3/2 level of Nd does not modify the energy of the Q-switch pulse, but increases the pulse repetition rate and the laser average power for the same absorbed pump power. This is demonstrated with 0.81 and 0.88μm CW laser diode-pumped Nd:YAG and Nd-vanadate lasers with average output power in the watt-level range at 1.06μm. The effect is explained by the control of passive Q-switching by the intracavity photon flux that is influenced by the pump wavelength and by the initial transmission of the SA crystal. On the other hand, it is discussed and experimentally proved that due to the possibility to control externally the frequency of switching, in case of the AO Q-switched Nd laser the change of the pump wavelength from 0.81 to 0.88μm increases the pulse energy for a fixed frequency, leading to a corresponding increase of the average laser power. [Copyright &y& Elsevier]
ISSN:00304018
DOI:10.1016/j.optcom.2009.08.067