Absolute Two-Photon Absorption Coefficients in UltraViolet Window Materials

Abstract

The absolute two-photon absorption coefficients of u.v. transmitting materials have been measured using well-calibrated single picosecond pulses, at the third and fourth harmonic of a mode locked Nd:YAG laser systems. Two-photon absorption coefficients of the order of .001 cm/MW were measured for alkali- halides, and .0001 cm/MW for harmonic generating crystals. In materials with band gap greater than 2 h-bar omega, no nonlinear absorption could be observed. Calculations based on the Keldysh theory with one adjustable parameter agree quite well with the experimentally observed dispersions in the two-photon absorption coefficients. The effect of multi-photon absorption on the conversion efficiency of harmonic generating crystals and on the breakdown of u. v. window materials is also discussed. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1977
Accession Number
ADA050379

Entities

People

  • J. Blake
  • Nicolaas Bloembergen

Organizations

  • Harvard University

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Absorption Coefficients
  • Band Gaps
  • Band Structures
  • Color Centers
  • Electric Fields
  • Electromagnetic Fields
  • Energy Bands
  • Laser Beams
  • Lasers
  • Materials
  • Measurement
  • Optical Materials
  • Refractive Index
  • Three Dimensional
  • Two Dimensional
  • Two Photon Absorption
  • Wave Mixing

Fields of Study

  • Physics

Readers

  • Approximation Theory.
  • Optical Physics and Photonics.

Technology Areas

  • Directed Energy
  • Directed Energy - Lasers