We performed saturated absorption spectroscopy of acetylene ( ${\mathrm{C}}_2{\mathrm{H}}_2$ ) ${\nu }_1+{\nu }_3$ band transitions with an optical nanofiber (ONF). Owing to high-intensity light around the ONF, we observed a Lamb dip at relatively low-power laser ( $\sim 10\mathrm{mW}$ ) without a cavity. Our results showed that the simple ONF spectrometer is advantageous for performing saturation absorption spectroscopy and serves as a practical low-cost wavelength reference in the optical fiber communication band.

© 2011 Optical Society of America

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