Noise in x(3) and photorefractive amplifiers

Shmuel Sternklar, Yaakov Glick

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


A comparison of the noise characteristics of x(3) and photorefractive coherent amplif iers reveals basic differences in their dependence on operating parameters. Unlike all types of x(3) amplif iers, which are shown to have a well-def ined optimum working point in the region of the self-stimulated scattering threshold, the photorefractive amplif ier can be made increasingly quieter by lowering the pump power. This is demonstrated by use of highly doped Co:BaTiO3 in a tight-focus ref lection grating geometry. It is shown that scattering from inhomogeneities in the crystal is the major limiting noise source and is signif icantly higher than predictions resulting from fundamental considerations such as random space-charge noise. An extremely high smallsignal gain of 107 was measured with this crystal and geometry. To our knowledge this is the highest photorefractive gain reported to date.

Original languageEnglish
Pages (from-to)2369-2371
Number of pages3
JournalOptics Letters
Issue number23
StatePublished - Dec 1995
Externally publishedYes


Dive into the research topics of 'Noise in x(3) and photorefractive amplifiers'. Together they form a unique fingerprint.

Cite this