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Title: Efficient frequency conversion by stimulated Raman scattering in a sodium nitrate aqueous solution

Frequency conversion of laser beams, based on stimulated Raman scattering (SRS) is an appealing technique for generating radiation at new wavelengths. Here, we investigated experimentally the SRS due to a single pass of a collimated frequency-doubled Nd:YAG laser beam (532 nm) through a saturated aqueous solution of sodium nitrate (NaNO{sub 3}), filling a 50 cm long cell. These experiments resulted in simultaneous generation of 1st (564 nm) and 2nd (599 nm) Stokes beams, corresponding to the symmetric stretching mode of the nitrate ion, ν{sub 1}(NO{sub 3}{sup −}), with 40 and 12 mJ/pulse maximal converted energies, equivalent to 12% and 4% efficiencies, respectively, for a 340 mJ/pulse pump energy. The results indicate that the pump and SRS beams were thermally defocused and that four-wave mixing was responsible for the second order Stokes process onset.
Authors:
 [1] ;  [2]
  1. Department of Engineering, Sapir Academic College, D. N. Hof Ashkelon 79165 (Israel)
  2. Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva 84105 (Israel)
Publication Date:
OSTI Identifier:
22482157
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 13; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AQUEOUS SOLUTIONS; BEAMS; EFFICIENCY; FREQUENCY MIXING; IONS; NEODYMIUM LASERS; PULSES; RAMAN EFFECT; SODIUM NITRATES; STRONTIUM SULFIDES; SYMMETRY; WAVELENGTHS