UV-Induced Absorption in All-Fiber Frequency Doublers: Characterization and Photobleaching

Author

Gladyshev, Alexey V. ; Corbari, Costantino ; Medvedkov, Oleg I. ; Vasiliev, Sergey A. ; Kazansky, Peter G. ; Dianov, Evgeny M.

Author_Institution

Fiber Opt. Res. Center, Moscow, Russia

Volume

33

Issue

2

fYear

2015

fDate

Jan.15, 15 2015

Firstpage

439

Lastpage

442

Abstract

Periodic UV exposure of thermally poled optical fibers is usually used to produce efficient all-fiber frequency doublers based on second-order nonlinearity. To date, no data regarding UV-induced absorption in poled fibers have been reported. In this study, we measured this absorption and showed how it affects the conversion efficiency of second harmonic generation at wavelengths below ~800 nm. Color centers responsible for induced absorption in poled GeO₂-doped fibers were identified and photobleached by continuous-wave radiation at 532 nm. We demonstrated that photobleaching does not affect the value of nonlinearity but improves the conversion efficiency of all-fiber frequency doublers. The results obtained can be used to improve the efficiency of all-fiber second harmonic generation in the blue-green part of the spectrum.

Keywords

germanium compounds; optical fibre fabrication; optical harmonic generation; optical saturable absorption; GeO₂; UV-induced absorption; all-fiber frequency doublers; color centers; continuous wave radiation; conversion efficiency; periodic UV exposure; photobleaching; second harmonic generation; second-order nonlinearity; thermally poled optical fibers; wavelength 532 nm; Absorption; Frequency conversion; Harmonic analysis; Nonlinear optics; Optical fiber devices; Optical fibers; Photobleaching; Induced absorption; induced absorption; optical fibers; photobleaching; second harmonic generation; thermal poling;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2015.2389259

Filename

7003993