Enhanced two-photon excitation through optical fiber by single-mode propagation in a large core

Fritjof Helmchen, David W. Tank, Winfried Denk

Research output: Contribution to journalArticle

51 Scopus citations

Abstract

Multiphoton excitation through optical fibers is limited by pulse broadening caused by self-phase modulation. We show that for short fiber lengths (approximately 2m) two-photon excitation efficiency at the fiber output can be substantially improved by single-mode propagation in a large-area multimode fiber (10-μm) core diameter) instead of a standard 5.5–μm core fiber. Measurements and numerical simulations of postfiber spectra and pulse widths demonstrate that the increase in efficiency is due to a reduction of nonlinear pulse broadening. Single-mode propagation in a large-core fiber is thus suitable for multiphoton applications for which pulse recompression is not possible at the fiber end.

Original languageEnglish (US)
Pages (from-to)2930-2934
Number of pages5
JournalApplied Optics
Volume41
Issue number15
DOIs
StatePublished - May 20 2002

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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