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The amplification of ultrashort pulses in a N 2 -laser-pumped amplifier was studied both theoretically and experimentally. A good agreement was found between the theoretical and experimental results over six orders of magnitude of input energies if the excited-state absorption of the dye was taken into account. The output energy density of the last amplifier stage was 16.0 mJ/cm 2 , which ensured an energy extraction efficiency as high as 7.7%. The calculated pulse duration increase was 20%. The amplified spontaneous emission background was found to be 1%. The stabilization of the output pulse energy by saturation of the amplification is discussed.
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Bor et al. (1982) studied this question.
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