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Title: Large femtosecond third-order optical nonlinearity of Bi{sub 3.15}Nd{sub 0.85}Ti{sub 3}O{sub 12} ferroelectric thin films

Both the linear and nonlinear optical properties of Bi{sub 3.15}Nd{sub 0.85}Ti{sub 3}O{sub 12} (BNT{sub 0.85}) ferroelectric thin films deposited on quartz substrates were investigated. The fundamental optical constants were determined as a function of light wavelength by optical transmittance measurements. By performing single-beam Z-scan experiments with femtosecond laser pulses at a wavelength of 800 nm, the two-photon absorption (TPA) coefficient β and third-order nonlinear refraction index γ were measured to be 1.15 × 10{sup 2 }cm/GW and −8.15 × 10{sup −3} cm{sup 2}/GW, respectively. The large TPA is attributed to an indirect transition process via the intermediate energy levels and the large refractive nonlinearity is the result of the electronic polarization and ferroelectric polarization arisen from the femtosecond midinfrared radiation. The results indicate that the BNT{sub 0.85} thin film is a promising candidate for applications in nonlinear photonic devices.
Authors:
; ; ; ; ; ; ;  [1] ; ;  [2]
  1. School of Materials Science and Engineering, Xiangtan University, Hunan Xiangtan 411105 (China)
  2. State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, CAS, Shanxi Xi'an 710119 (China)
Publication Date:
OSTI Identifier:
22391962
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 19; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABSORPTION; BISMUTH COMPOUNDS; ENERGY LEVELS; FERROELECTRIC MATERIALS; LASERS; NEAR INFRARED RADIATION; NEODYMIUM COMPOUNDS; NONLINEAR PROBLEMS; OPTICAL PROPERTIES; PHOTONS; POLARIZATION; PULSES; QUARTZ; REFRACTION; SUBSTRATES; THIN FILMS; TITANIUM OXIDES