Abstract

Saturated absorption spectroscopy is performed on the acetylene ν1+ν3 band near 1532nm inside photonic bandgap fibers of small (10μm) and large (20μm) core diameters. The observed linewidths are narrower in the 20μm fiber and vary from 20 to 40MHz depending on pressure and power. Variations in the background light transmission, attributed by others to surface modes, are significantly reduced in the 20μm fiber. The optimum signal for use as a frequency reference in a 0.8m long, 20μm diameter fiber is found to occur at about 0.5torr for 30mW of pump power. The saturation power is found by modeling the propagation and attenuation of light inside the fiber.

© 2006 Optical Society of America

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