ENERGY-TRANSFER ENHANCEMENT IN PHOTOREFRACTIVE INP-FE CRYSTALS USING AN AUXILIARY INCOHERENT BEAM AND A NEGATIVE THERMAL-GRADIENT

OZKUL C., PICOLI G., GRAVEY P., LEROUZIC J.

OPTICAL ENGINEERING, vol.30, no.4, pp.397-402, 1991 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 30 Issue: 4
  • Publication Date: 1991
  • Doi Number: 10.1117/12.55820
  • Journal Name: OPTICAL ENGINEERING
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.397-402
  • Istanbul Technical University Affiliated: No

Abstract

The exponential gain of two-beam coupling in InP:Fe crystals under dc fields is a function of the pump beam intensity at a given temperature. We propose two methods to extend the sample volume working under optimum conditions. The first method is based on a negative thermal gradient and the second uses an auxiliary incoherent beam. Theoretical simulations predict an integrated gain of 15 cm-1 and 10 cm-1, respectively (for lambda = 1.06-mu-m, LAMBDA = 5-mu-m and E0 = 10 kV/cm) in thick crystals (L = .5 mm). Preliminary experimental results confirm that high gain performances can be achieved by using these methods.