One- and two-photon pumped soft lithographed DFB laser systems based on semiconductor core-shell quantum dots

F. Todescato, I. Fortunati, S. Gardin, R. Signorini, R. Bozio, J. J. Jasieniak, A. Martucci, G. Della Giustina, G. Brusatin, M. Guglielmi

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

2 Citations (Scopus)


In the last years inorganic semiconductor (particularly CdSe and CdS) quantum dots (QDs) have received great attention for their important optical properties. The possibility to tune the emission wavelength, together with their high fluorescence quantum efficiency and photostability, can be exploited in photonic and optoelectronic technological applications. The design of DFB devices, based on QDs as active optical material, leads to the realization of compact laser systems. In this work we explore the use of an inorganic/organic hybrid material composed of CdSe-ZnS semiconductor quantum dots doped into a zirconia sol-gel matrix for optical gain applications. Through the use of soft lithography on a sol-gel germania-silica hybrid, large scale distributed feedback gratings can be created. Used in conjunction with the CdSe-ZnS/ZrO 2 hybrids, these gratings can act as microcavities and allow for the realization of true lasing action. The lasing properties within these devices are characterized in the femtosecond regime by both one- and two-photon excitation. From experimental data the value of the optical gain of the core-shell quantum dot samples has been estimated. Moreover, one- and two-photon lasing threshold and stability are reported.

Original languageEnglish
Title of host publicationNonlinear Frequency Generation and Conversion
Subtitle of host publicationMaterials, Devices, and Applications IX
ISBN (Print)9780819479785
Publication statusPublished - 10 May 2010
Externally publishedYes
EventNonlinear Frequency Generation and Conversion: Materials, Devices, and Applications IX - San Francisco, CA, United States of America
Duration: 25 Jan 201028 Jan 2010

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


ConferenceNonlinear Frequency Generation and Conversion: Materials, Devices, and Applications IX
Country/TerritoryUnited States of America
CitySan Francisco, CA


  • DFB laser
  • Imprinting
  • Quantum dots
  • Sol-gel
  • Two-photon absorption
  • Up-converted lasing

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