Mirrorless lasing from thiophene∕phenylene co-oligomer crystals based on stimulated resonance Raman scattering

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  • Hisao Yanagi
    Kobe University Faculty of Engineering, , Rokkodai, Nada-ku, Kobe 657-8501, Japan and PRESTO, , 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
  • Atsutoshi Yoshiki
    Kobe University Faculty of Engineering, , Rokkodai, Nada-ku, Kobe 657-8501, Japan
  • Shu Hotta
    Kyoto Institute of Technology Faculty of Textile Science, , Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
  • Shunsuke Kobayashi
    National Institute of Advanced Industrial Science and Technology (AIST) Photonics Research Institute, , 1-1-1 Umezone, Tsukuba, Ibaraki 305-8568, Japan

抄録

<jats:p>Very narrowed light emission was observed from single crystals of various thiophene∕phenylene co-oligomers. Under optical pumping at their resonant absorption wavelengths, all the platelet crystals showed amplified spontaneous emission with a full width at half maximum (FWHM) of 5–7nm. When the pumping wavelengths approached the absorption edges, the crystals emitted further narrowed laserlike lines (FWHM&lt;0.5nm). From their Stokes shift frequencies compared with the off-resonant Raman spectra, we assigned these emission lines to the stimulated resonance Raman scattering. These lines appeared in single or double according to the Raman active modes determined by their different molecular symmetry. The dependence of line intensity on polarized pumping suggested that the stimulated resonance Raman scattering was related to polaritonic phenomena of vibrationally dressed excitons in the uniaxially oriented molecular crystals.</jats:p>

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