Observation of stimulated emission by direct three-photon excitation
Multiphoton processes, predicted theoretically in 1931, were for a long time considered to be mainly of academic interest. This view changed when it was shown that a two-photon absorption process could, because of a quadratic dependence of excitation on intensity, produce a spatially confined excita...
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| Veröffentlicht in: | Nature (London) 2002-02, Vol.415 (6873), p.767-770 |
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| creator | Prasad, Paras N He, Guang S Markowicz, Przemyslaw P Lin, Tzu-Chau |
| description | Multiphoton processes, predicted theoretically in 1931, were for a long time considered to be mainly of academic interest. This view changed when it was shown that a two-photon absorption process could, because of a quadratic dependence of excitation on intensity, produce a spatially confined excitation useful for three-dimensional data storage and imaging. Two-photon absorption has received considerable attention recently because of the development of highly efficient two-photon-sensitive materials, leading to numerous technological applications. These successes have created interest in exploring applications based on three-photon excitations. For a three-photon process, a longer excitation wavelength such as those common in optical communications can be used. Also, the cubic dependence of the three-photon process on the input light intensity provides a stronger spatial confinement, so that a higher contrast in imaging can be obtained. Here we report the observation of a highly directional and up-converted stimulated emission as an amplified spontaneous emission, produced in an organic chromophore solution by a strong simultaneous three-photon absorption at 1.3 µm. This achievement suggests opportunities for a three-photon process in frequency-upconversion lasing, short-pulse optical communications, and the emerging field of biophotonics. |
| doi_str_mv | 10.1038/415767a |
| format | Article |
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This view changed when it was shown that a two-photon absorption process could, because of a quadratic dependence of excitation on intensity, produce a spatially confined excitation useful for three-dimensional data storage and imaging. Two-photon absorption has received considerable attention recently because of the development of highly efficient two-photon-sensitive materials, leading to numerous technological applications. These successes have created interest in exploring applications based on three-photon excitations. For a three-photon process, a longer excitation wavelength such as those common in optical communications can be used. Also, the cubic dependence of the three-photon process on the input light intensity provides a stronger spatial confinement, so that a higher contrast in imaging can be obtained. Here we report the observation of a highly directional and up-converted stimulated emission as an amplified spontaneous emission, produced in an organic chromophore solution by a strong simultaneous three-photon absorption at 1.3 µm. This achievement suggests opportunities for a three-photon process in frequency-upconversion lasing, short-pulse optical communications, and the emerging field of biophotonics.</description><identifier>ISSN: 0028-0836</identifier><identifier>EISSN: 1476-4687</identifier><identifier>DOI: 10.1038/415767a</identifier><identifier>PMID: 11845202</identifier><identifier>CODEN: NATUAS</identifier><language>eng</language><publisher>London: Nature Publishing</publisher><subject>Absorption ; Atoms & subatomic particles ; Biology ; Coloring Agents - chemistry ; Coloring Agents - metabolism ; Communications ; Data storage ; Emissions ; Exact sciences and technology ; Fundamental areas of phenomenology (including applications) ; Lasers ; Light ; Light intensity ; Optical materials ; Optics ; Optics and Photonics - instrumentation ; Photons ; Phototherapy ; Physics ; Polymers and organics</subject><ispartof>Nature (London), 2002-02, Vol.415 (6873), p.767-770</ispartof><rights>2002 INIST-CNRS</rights><rights>COPYRIGHT 2002 Nature Publishing Group</rights><rights>Copyright Macmillan Journals Ltd. 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| ispartof | Nature (London), 2002-02, Vol.415 (6873), p.767-770 |
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| subjects | Absorption Atoms & subatomic particles Biology Coloring Agents - chemistry Coloring Agents - metabolism Communications Data storage Emissions Exact sciences and technology Fundamental areas of phenomenology (including applications) Lasers Light Light intensity Optical materials Optics Optics and Photonics - instrumentation Photons Phototherapy Physics Polymers and organics |
| title | Observation of stimulated emission by direct three-photon excitation |
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