skip to main content

Title: Optical breakdown threshold in nanosecond high repetition second harmonic generation by periodically poled Mg-doped LiTaO{sub 3} 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 LiTaO{sub 3} 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/cm{sup 2} for 1064 nm input radiation in 6.8 kHz pulsed SHG operation, agreeing well with the experimentally found value ≈1.32 J/cm{sup 2}.
Authors:
;  [1] ; ;  [2]
  1. Center for Advanced Photonics, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan)
  2. Division of Environment and Energy Materials, National Institute for Materials Science (NIMS) 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan)
Publication Date:
OSTI Identifier:
22218141
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 9; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION; BREAKDOWN; CRYSTAL LATTICES; CRYSTALS; DOPED MATERIALS; ELECTRIC CHARGES; ELECTRONS; EV RANGE; HARMONIC GENERATION; KHZ RANGE; LASERS; LITHIUM COMPOUNDS; MAGNESIUM; PERIODICITY; PHOTONS; POLARIZATION; STOICHIOMETRY; TEMPERATURE DEPENDENCE