Abstract

An external cavity 1540-nm diode laser was frequency doubled in a 3-cm-long periodically poled LiNbO3 waveguide doubler with 150% W-1 conversion efficiency, thereby generating more than 3 μW at 770 nm. Second-harmonic light was used to detect and lock to sub-Doppler lines of the 39K D 1 transition.

© 1998 Optical Society of America

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