Neutron Damage in Distributed Bragg Reflectors and Microcavity Lasers.

Abstract

Distributed Bragg Reflectors (DBRs) grown on a gallium-arsenide substrate for a solid state mirror and a vertical cavity surface emitting laser (VCSEL) were subjected to a neutron fluence to determine the sensitivity of the DBRs. The samples were irradiated at Ohio State University's 500 kW research reactor. Relative and absolute reflectance measurements were taken before and after each irradiation over a spectral band of 530 880 nm. Relative reflectance measurements showed that the irradiation did not cause any spectral shift over seven decades of neutron fluences. The reflectivity of the DBRs decreased from their initial measurements after being irradiated. The reflectance decrease was correlated to the incident neutron fluence to determine a Messenger Spratt type of equation to predict the DBRs response. A radiation damage constant for the VCSEL and DBR mirror were determined to be 3.83x10(exp13) NEUTRONS/CM2 and 2.19x10(exp13)NEUTRONS/CM2 respectively utilizing a 1 MeV equivalent (Si) neutron fluence.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1995
Accession Number
ADA305361

Entities

People

  • Mark A. Suriano

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Advanced Electronics
  • Counter WMD
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Band Gaps
  • Band Structures
  • Band Theory Of Solids
  • Charged Particles
  • Distributed Bragg Reflectors
  • Energy Bands
  • Gamma Decay
  • Light Sources
  • Measurement
  • Neutron Bombardment
  • Optical Properties
  • Optics
  • Point Defects
  • Radiation
  • Refractive Index
  • Scattering
  • Semiconductors

Fields of Study

  • Physics

Readers

  • Nuclear and Radiation Engineering.
  • Optical Physics and Photonics.
  • Spectroscopy.

Technology Areas

  • Directed Energy
  • Microelectronics