Abstract
We have made a selection of the leading structures among cationic polymethine dyes with different structures of terminal heterocyclic groups and polymethine chains for passive Q-switch of a diode-pumped solid-state neodymium laser. Such dyes have a maximum absorption in the region of 1060 nm and a minimum absorption in the region of 810 nm. It was found that the 4-((E)-2-((E)-2-chloro-3-(2-(2,6-diphenyl-4H-thiopyran-4-ylidene)ethylidene)cyclohex-1-en-1-yl)vinyl)-2,6-diphenylthiopyrylium tetrafluoroborate dye most closely matches these characteristics. The nature of its long-wavelength and higher electronic transitions was interpreted based on quantum-chemical calculations by the DFT/B3LYP/6-31G (d, p) method and TDDFT taking into account the polarity of the medium by the PCM method. The use of this dye as a laser Q-switch made it possible for the first time to obtain passive mode locking in diode-pumped neodymium lasers.
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