Abstract
Pumping wavelength related population inversion in an Nd:doped laser has been investigated, where the laser is regarded as two thermodynamic equilibrium systems: the upper state and the lower state. The population inversion limits at various pumping wavelengths and temperatures are compared. The effective metastable lifetime has been derived, where both pump and laser fields within the Nd:doped laser medium reduce the lifetime. The saturation of the lifetime is discussed. As a result, in-band pumping of the Nd:doped laser is good for improving the efficiency and achieving the narrow-linewidth of the laser wavelength due to less population inversion; off-band pumping is beneficial for extracting high pulse energy, thanks to large population inversion.
Highlights
Diode-pumped solid-state lasers (DPSSLs) with the advantages in compactness and efficiency have been widely investigated
Nd:YVO4 and Nd:GdVO4 laser crystals have several spectroscopic properties, such as large stimulated emission cross section and strong broadband absorption around 808 nm that are relevant to AlGaAs laser diode pumping
Nd:doped laser again because high power AlGaAs laser diodes can operate in the wavelength of 880 nm/888 nm
Summary
ARTICLES YOU MAY BE INTERESTED IN Simultaneous triple 914 nm, 1084 nm, and 1086 nm operation of a diode-pumped Nd:YVO4 laser Journal of Applied Physics 116, 163107 (2014); https://doi.org/10.1063/1.4900542 Stimulated-emission cross section at 1064 and 1342 nm in Nd : YVO4 Journal of Applied Physics 48, 4907 (1977); https://doi.org/10.1063/1.323618 Laser emission cross section of Nd:YAG at 1064 nm Journal of Applied Physics 52, 1212 (1981); https://doi.org/10.1063/1.329740
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