Abstract

Single-pass efficient frequency upconversion of 1.064- and 1.319-μm Q-switched and mode-locked Nd:YAG laser pulses into visible-wavelength light in the range 450–600 nm in silica-based monomode optical fibers is reported. The visible upconverted signal propagates in the LP₀₂ fiber mode and exhibits an asymmetrical wide-bandwidth spectrum of several nanometers with a long tail toward high frequencies. At both pump wavelengths the upconversion process presents a critical fiber length of a few meters and a threshold power that depends on the fiber length and the pump wavelength. It is also observed that the visible light signal has its peak wavelength centered on higher frequencies for fibers with longer minimum dispersion wavelengths. In pure SiO₂-core fibers pumped at 1.319 μm, conversion efficiencies of approximately 0.5% were obtained, and a 20-W peak power upconversion signal was generated at 580 nm.

© 1993 Optical Society of America

Efficient frequency upconversion of 1.319-μm radiation into intense yellow light at 580 nm in pure SiO₂-core monomode optical fiber

M. V. D. Vermelho, A. M. Reis, E. A. Gouveia, M. L. Lyra, and A. S. Gouveia-Neto
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