Abstract

Continuous-wave mid-infrared radiation near $3.5 \mathit{\mu }\mathrm{m}$ is generated by difference-frequency mixing of the output of a compact $1.1–1.5‐\mathit{\mu }\mathrm{m}$ dual-wavelength fiber amplifier in periodically poled ${\mathrm{LiNbO}}_3$. The diode side-pumped amplifier is constructed with double-cladding Yb-doped fiber followed by single-mode Er/Yb codoped fiber. Output powers of as much as $11 \mathit{\mu }\mathrm{W}$ at $3.4 \mathit{\mu }\mathrm{m}$ are obtained, and spectroscopic detection of ${\mathrm{CH}}_4$ and ${\mathrm{H}}_2\mathrm{CO}$ is demonstrated.

© 1998 Optical Society of America

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