Excited state absorption of pump and laser radiations in NYAB non-linear crystal operating at 1.3 µm for visible laser light generation
Jaque, D.; García Solé, J.; Brenier, A.; Boulon, G.; Luo, Z. D.; Jaque D.; Departamento de Física de Materiales, Universidad Autonoma de Madrid, Cantoblanco 28049, Madrid, Spain; García Solé J.; Departamento de Física de Materiales, Universidad Autonoma de Madrid, Cantoblanco 28049, Madrid, Spain; Brenier A.; Laboratoire de Physico-Chimie des Matériaux Luminiscents (UMR CNRS 5620), Université Claude Bernard-Lyon, 69629 Villeurbane, France; Boulon G.; Laboratoire de Physico-Chimie des Matériaux Luminiscents (UMR CNRS 5620), Université Claude Bernard-Lyon, 69629 Villeurbane, France; Luo Z. D.; Fujian Institute of Research on The Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P.R. China
Журнал:
The European Physical Journal Applied Physics
Дата:
2000
Аннотация:
Excited state absorption of laser (≅ 1.3 µm, corresponding to the $^4{\rm F}_{3/2}\to {}^{4}I_{13/2}$ laser channel) and pump (790-860 nm) radiation have been investigated in Nd doped YAl<sub>3</sub>(BO<sub>3</sub>)<sub>4</sub> non-linear laser crystal. Laser gain slope efficiency measurements as a function of pump wavelength have been used to estimate the excited state absorption of pump radiation. On the other hand, excited state absorption cross-section in the 1300−1400 nm wavelength range has been measured by using two beam spectroscopy. We have obtained that excited state absorption cross-section for pump radiation is negligible whereas around 1.3 µm it is comparable to the stimulated emission cross-section from <sup>4</sup>F<sub>3/2</sub> state, so that the net gain cross-section becomes negative for certain wavelengths.
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