Abstract

A cw mid-IR coherent source based on difference-frequency generation is designed and characterized. For mid-IR generation, a periodically poled MgO:LiNbO3 crystal is placed inside a compact Ti:sapphire laser cavity. This provides high-power pump radiation for the nonlinear process. Optical injection by an external-cavity diode laser ensures single-frequency operation of the Ti:sapphire laser, while signal radiation is provided by a fiber-amplified Nd:YAG laser. Mid-IR radiation can be generated with 38504540nm tuning range, narrow linewidth, Cs-standard traceability, and TEM00 spatial mode. 30mW power is obtained at 4510nm.

© 2010 Optical Society of America

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