Optical breakdown threshold in nanosecond high repetition second harmonic generation by periodically poled Mg-doped LiTaO3 crystal
Our study shows that a local temperature increase of ≈1 K in the crystal lattice caused by second harmonic generation (SHG) and two-photon absorption of 532 nm radiation at the rear of periodically poled stoichiometric LiTaO3 crystal by changing spontaneous polarization induces a pyroelectric field...
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Veröffentlicht in: | Applied physics letters 2013-08, Vol.103 (9) |
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Hauptverfasser: | , , , |
Format: | Artikel |
Sprache: | eng |
Online-Zugang: | Volltext |
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Zusammenfassung: | Our study shows that a local temperature increase of ≈1 K in the crystal lattice caused by second harmonic generation (SHG) and two-photon absorption of 532 nm radiation at the rear of periodically poled stoichiometric LiTaO3 crystal by changing spontaneous polarization induces a pyroelectric field ≈10 kV/cm, accelerating free electrons to an energy of ≈10 eV, followed by optical breakdown and crystal damage. Theoretical analysis leads to an explicit expression for the threshold laser fluence of optical breakdown giving ≈1.2 J/cm2 for 1064 nm input radiation in 6.8 kHz pulsed SHG operation, agreeing well with the experimentally found value ≈1.32 J/cm2. |
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ISSN: | 0003-6951 1077-3118 |
DOI: | 10.1063/1.4819758 |