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Two-photon-absorpti...
Two-photon-absorption enhanced terahertz generation from KTP optically pumped in the visible-to-UV range
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- Zhai, Dongwei (författare)
- Univ Savoie Mt Blanc, UMR CNRS 5130, IMEP LAHC, F-73376 Le Bourget Du Lac, France.
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- Herault, Emilie (författare)
- Univ Savoie Mt Blanc, UMR CNRS 5130, IMEP LAHC, F-73376 Le Bourget Du Lac, France.
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- Garet, Frederic (författare)
- Univ Savoie Mt Blanc, UMR CNRS 5130, IMEP LAHC, F-73376 Le Bourget Du Lac, France.
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- Pasiskevicius, Valdas (författare)
- KTH,Tillämpad fysik
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- Laurell, Fredrik, professor, 1957- (författare)
- KTH,Tillämpad fysik
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- Coutaz, Jean-Louis (författare)
- Univ Savoie Mt Blanc, UMR CNRS 5130, IMEP LAHC, F-73376 Le Bourget Du Lac, France.
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Univ Savoie Mt Blanc, UMR CNRS 5130, IMEP LAHC, F-73376 Le Bourget Du Lac, France Tillämpad fysik (creator_code:org_t)
- The Optical Society, 2021
- 2021
- Engelska.
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Ingår i: Optics Express. - : The Optical Society. - 1094-4087. ; 29:23, s. 37683-37694
- Relaterad länk:
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- By generating terahertz pulses in KTP crystals through optical rectification with a pump photon energy varying from below to above the bandgap, we observe a peak of the THz signal at the bandgap energy but also a second one around half the bandgap. This later one is attributed to a two-photon absorption enhanced nonlinearity, which is validated by the similarity of the two-photon absorption coefficient and THz peak amplitude data versus the pump photon energy. A careful analysis of the KTP sample absorption spectral dependence nearby the bandgap demonstrates that KTP is an indirect bandgap crystal, whose absorption below the bandgap involves emission of a phonon related to the symmetric Ti-O stretching vibration, i.e. the nu(1) (A(1g)) mode.
Ämnesord
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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