Second-harmonic generation in optical glass fibers

Abstract

The coherence length of frequency-doubled light generated in an optical fiber pumped by light at λ = 1.064 μm was measured interferometrically. The largest bandwidth for second-harmonic generation in a fiber was measured to be approximately 3 Å. By coupling light at 1.064 and 0.532 μm simultaneously into an unprepared fiber, a dynamic grating was created in the fiber. This grating made it possible to frequency double different wavelengths in the IR region.