Optical and Quantum Electronics

, Volume 47, Issue 10, pp 3253–3271 | Cite as

Coaxial-geometry tunable dual-wavelength flashlamp-pumped Nd:Yag laser

  • Margarita Deneva
  • Marin Nenchev
  • Ernst Wintner
  • Suat Topcu


We propose to take advantage of the focalization effect of the pump light by the cylindrical laser rod in a side-pumped Nd:YAG laser (flashlamp or diode pumping) to obtain efficient two-wavelength operation. Under conveniently chosen conditions the focusing by the rod increases the pump power density in the near axial rod part about 2½ times, as we show, in comparison with the peripheral rod part. The focalization can strongly facilitate and to increase energetically the generation of weaker lasing lines in the axial part. This advantage is utilized by employing coaxial two-channel laser architecture, where the optically separated axial and peripheral parts of the rod generate each in its own spectral selective resonator. Beside the competition-less generation at two wavelengths (lines), other specific and essential advantages of the proposed laser solution are: (1) to produce emissions at a weaker line (generated in the axial part) and at a stronger line (in peripheral part), simultaneously and with equalized energy without loss of pump energy for the equalization; (2) the two emissions are produced and emitted naturally in coaxial beams using the full rod volume. We have realized such a laser with flash-lamp pumping (output to ~0.45 J; tunable pair of lines from 1.06, 1.32, 1.34, 1.36 and 1.44 μm) and carried out an experimental and theoretical study of its operation, including passive Q-switching.


Two-wavelength Nd:YAG laser Coaxial geometry Laser rod focalization effect Competition-less generation Flashlamp pumping Independent control 



This work was supported partially by the contracts DNTS/Austria 01/3 (Project No. BG 07/2013) and DRILA 01/7-19 (TR PHC RILA 2011 Projet No. 25197 VB France) and the Technical University of Sofia, R&D Department and Branch Plovdiv. M.D. and M.N. thank to Photonics Institute, Vienna University of Technology and LISV, Universite de Versailles Saint-Quentin, France for the possibility to carry out joint work in their laboratories.


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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Margarita Deneva
    • 1
  • Marin Nenchev
    • 1
  • Ernst Wintner
    • 2
  • Suat Topcu
    • 3
  1. 1.Dept. OELE and R&D Lab. QOELTechnical University of SofiaPlovdivBulgaria
  2. 2.Photonics InstituteVienna University of TechnologyViennaAustria
  3. 3.Laboratoire d’Ingénierie des Systèmes de Versailles (LISV)Université de Versailles Saint-QuentinVersaillesFrance

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