https://doi.org/10.1051/epjap:2000116
Excited state absorption of pump and laser radiations in NYAB non-linear crystal operating at 1.3 µm for visible laser light generation
1
Departamento de Física de Materiales, Universidad Autonoma de Madrid, Cantoblanco 28049, Madrid,
Spain
2
Laboratoire de Physico-Chimie des Matériaux Luminiscents (UMR CNRS 5620), Université Claude
Bernard-Lyon, 69629 Villeurbane, France
3
Fujian Institute of Research on The Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian
350002,
P.R. China
Corresponding author: Jose.Garcia_Sole@uam.es
Received:
20
September
1999
Revised:
19
January
2000
Accepted:
14
February
2000
Published online: 15 April 2000
Excited state absorption of laser (≅ 1.3 µm, corresponding to the
laser channel) and pump (790-860 nm) radiation have been
investigated in Nd doped YAl3(BO3)4 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 4F3/2 state, so that the net gain cross-section
becomes negative for certain wavelengths.
PACS: 42.55.Rz – Doped-insulator lasers and other solid state lasers / 42.70.Hj – Laser materials / 78.55.Hx – Other solid inorganic materials
© EDP Sciences, 2000
